json-pawarser: format the checks ✨prettily✨

- work on new world
  - add file db
  - source_file parsing
  - locs
- fix some test stuff

.envrc

@@ -1 +1,2 @@
-use flake . --impure
+use flake . --impure
+export TYPST_ROOT="$(pwd)/docs"

.gitignore

@@ -2,3 +2,7 @@
 .direnv/
 /target
 .pre-commit-config.yaml
+*.pdf
+/docs/*.png
+/testfiles/gen/*
+!/testfiles/gen/.gitkeep

.helix/languages.toml

@@ -0,0 +1,3 @@
+[[language]]
+name = "ron"
+file-types = [ "rpl" ]

CODE_OF_CONDUCT.md

@@ -0,0 +1,10 @@
+See https://www.rust-lang.org/policies/code-of-conduct.
+The current maintainers, that is,
+
+- [@Schrottkatze](https://forge.katzen.cafe/schrottkatze)
+- [@multisamplednight](https://forge.katzen.cafe/multisamplednight)
+
+are the entities to email, message or talk to if you feel like any interaction in the context of
+iOwO is not okay. We'll try to answer as soon as we can.
+
+Please do **not** open an issue. Notify the maintainers privately instead.

CONTRIBUTING.md

@@ -0,0 +1,120 @@
+# Contributing to iOwO
+
+Before we get started, thank you for thinking about doing so!
+
+## Through an issue
+
+- Be excellent to each other. Adhere to the [code of conduct].
+- About the title: If you had 5 seconds to tell someone the essence of the issue, what would it be?
+
+### Bugs
+
+- Write out in detail which steps in which order are necessary to reproduce the bug.
+- Include environmental information as well, in specific:
+  - How did you install iOwO?
+  - What version of iOwO are you running?
+  - What operating system are you running?
+    In the case of a Linux distro, mention the specific distro and when you last updated as well.
+- If the bug causes a crash, try to get a backtrace or in worse cases, a coredump.
+
+### Feature requests
+
+- Be sure to include a motivation in which case your intended feature would be used
+  even if it seems obvious to you.
+- Estimate what would be needed to implement the feature:
+  - Is it an addition to the language itself?
+  - Is it just a new command?
+  - Does it ground-breakingly change how iOwO works?
+
+## Through a PR
+
+1. Clone the repo.
+2. Switch to a new appropiately named branch for what you want to do, using `git switch -c`.
+3. Implement your code changes with your favorite code editor.
+4. Try them with `cargo run`.
+5. If there are errors or warnings, go to step 3. Commit occasionally.
+6. Otherwise,
+  - if you have an account at https://forge.katzen.cafe,
+    1. fork the repo
+    2. set it up as a remote using `git remote add`
+    3. push using `git push @ -u`
+  - if you don't,
+    1. combine your patches using `git diff --patch` and throw them in a file
+    2. send that file to one of the maintainers per email
+      - alongside with a description of what it does
+    3. also mention in the mail that we should consider GitHub and GitLab mirrors,
+       referring to this line
+
+### Tech stack
+
+The techstack we operate on is
+
+- [typst] for documents and concrete proposals
+- [Rust] for the actual code
+
+So if you want to contribute functionality, take a look at [The Rust Programming Language book]!
+If you want to contribute thoughts and technical designs, then consider taking a ride through
+[typst's excellent tutorial]!
+
+For creative things, we suggest using whatever **you** are comfortable with.
+Otherwise, we suggest these:
+
+- [Inkscape], [GIMP] and [Blender] for promotional material like logos and posters
+- [Penpot] for layouting prototypes and the like
+
+[typst]: https://typst.app
+[Rust]: https://www.rust-lang.org
+[The Rust Programming Language book]: https://doc.rust-lang.org/book/
+[typst's excellent tutorial]: https://typst.app/docs/tutorial
+
+[Inkscape]: https://inkscape.org/
+[GIMP]: https://www.gimp.org/
+[Blender]: https://www.blender.org/
+[Penpot]: https://penpot.app/
+
+## Politics
+
+- Current maintainers are defined as the entities listed in the [code of conduct]
+
+### PRs
+
+- Every PR requires an approving review from a maintainer (that is not the author) before merge
+- Maintainers can merge their own PRs
+  - But only after approval
+
+### Major decisions
+
+- All current maintainers have to agree **unanimously**.
+- Agreement must be based on [informed consent].
+  - In effect, a maintainer has to understand what they agree to.
+
+# Interacting with PRs
+
+Remember, be respectful.
+Entities invest their free time and motivation into making these changes,
+treat them appropiately.
+
+- Since we mostly work based on forks, [git's remotes] work fairly good.
+- Replace things in pointy brackets (`<>`) respectively (and remove the pointy brackets).
+
+## Initial steps for a new contributor or new local checkout
+
+```sh
+git remote add <contributor-name> https://forge.katzen.cafe/<contributor-account>/iowo.git
+git remote update <contributor-name>
+```
+
+## After setting up the remote
+
+- You can repeat this step anytime you want to switch branches or update your local checkout.
+- The PR branch is visible just below the PR title on Forgejo, after the colon (`:`).
+
+```sh
+git switch <pr-branch>
+git pull
+```
+
+
+[code of conduct]: ./CODE_OF_CONDUCT.md
+[informed consent]: https://en.wikipedia.org/wiki/Informed_consent
+[git's remotes]: https://git-scm.com/docs/git-remote

Cargo.toml

@@ -1,20 +1,31 @@
-[package]
+[workspace]
-name = "pipeline-lang"
+members = [
-version = "0.1.0"
+  "crates/app",
-edition = "2021"
+  "crates/eval",
+  "crates/ir", 
+  "crates/lang", 
+  "crates/svg-filters",
+  "crates/prowocessing", 
+  "crates/executor-poc", 
+  "crates/pawarser", 
+  "crates/json-pawarser",
+]
+resolver = "2"
 
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+[workspace.dependencies]
+clap = { version = "4", features = ["derive"] }
+serde = { version = "1.0", features = ["derive"] }
+petgraph = "0.6.4"
 
-[dependencies]
+# to enable all the lints below, this must be present in a workspace member's Cargo.toml:
-logos = "0.13"
+# [lints]
-codespan-reporting = "0.11"
+# workspace = true
-clap = { version = "4.4.8", features = [ "derive" ] }
 
-[lints.rust]
+[workspace.lints.rust]
 unsafe_code = "deny"
 variant_size_differences = "warn"
 
-[lints.clippy]
+[workspace.lints.clippy]
 branches_sharing_code = "warn"
 clone_on_ref_ptr = "warn"
 cognitive_complexity = "warn"

LICENSE

@@ -0,0 +1,676 @@
+The main program and its libraries are licensed under the AGPL 3.0
+as listed below the separator line.
+
+Media samples in the testfiles folder are licensed under CC BY-SA 4.0.
+To view a copy of this license, visit http://creativecommons.org/licenses/by-sa/4.0/
+The appropiate authors are given below, in the format of
+`- file/path: author (link to author)`
+
+- testfiles/rails.png: Schrottkatze (https://forge.katzen.cafe/schrottkatze)
+
+===============================================================================
+
+iOwO: media pipeline toolset
+Copyright (C) 2024  Schrottkatze, MultisampledNight and iOwO contributors
+
+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
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+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
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+
+  13. Remote Network Interaction; Use with the GNU General Public License.
+
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+Program, your modified version must prominently offer all users
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+
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+
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+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
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+interface could display a "Source" link that leads users to an archive
+of the code.  There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<https://www.gnu.org/licenses/>.

README.md

@@ -0,0 +1,16 @@
+# iOwO
+
+Tired of remembering if the argument order matters on this ImageMagick command?
+Tired of having shell parsing interfere with what you actually want to do?
+
+Fear no more, with iOwO (pronounced iowo (
+we believe at least (we don't know what we're doing [please help]!)
+)) you can just write a plain pipeline with [nushell]-ish syntax!
+Or that's what we want it to be at least.
+
+So, uh, grab a seat and a beverage, sit down, and maybe take a look around.
+Although there's not much here — _yet_.
+
+[please help]: ./CONTRIBUTING.md
+[nushell]: https://www.nushell.sh/
+

crates/app/Cargo.toml

@@ -0,0 +1,23 @@
+[package]
+name = "app"
+version = "0.1.0"
+edition = "2021"
+default-run = "app"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+ariadne = "0.4"
+clap = { workspace = true, features = [ "derive", "env" ] }
+dirs = "5"
+eval = { path = "../eval" }
+ir = { path = "../ir" }
+prowocessing = { path = "../prowocessing"}
+owo-colors = "4"
+ron = "0.8"
+serde = { workspace = true, features = [ "derive" ] }
+serde_json = "1.0"
+time = { version = "0.3", features = [ "local-offset" ] }
+
+[lints]
+workspace = true

crates/app/src/config.rs

@@ -0,0 +1,93 @@
+use self::config_file::{find_config_file, Configs};
+pub(crate) use cli::CliConfigs;
+
+mod cli;
+mod config_file;
+
+/// this struct may hold all configuration
+pub struct Config {
+    pub evaluator: eval::Available,
+
+    pub startup_msg: bool,
+}
+
+impl Config {
+    /// Get the configs from all possible places (args, file, env...)
+    pub fn read(args: &CliConfigs) -> Self {
+        // let config = if let Some(config) = &args.config_path {
+        //     Ok(config.clone())
+        // } else {
+        //     find_config_file()
+        // };
+        let config = args
+            .config_path
+            .clone()
+            .ok_or(())
+            .or_else(|()| find_config_file());
+
+        // try to read a maybe existing config file
+        let config = config.ok().and_then(|path| {
+            Configs::read(path).map_or_else(
+                |e| {
+                    eprintln!("Config error: {e:?}");
+                    eprintln!("Proceeding with defaults or cli args...");
+                    None
+                },
+                Some,
+            )
+        });
+
+        if let Some(file) = config {
+            Self {
+                evaluator: args.evaluator.and(file.evaluator).unwrap_or_default(),
+                // this is negated because to an outward api, the negative is more intuitive,
+                // while in the source the other way around is more intuitive
+                startup_msg: !(args.no_startup_message || file.no_startup_message),
+            }
+        } else {
+            Self {
+                startup_msg: !args.no_startup_message,
+                evaluator: args.evaluator.unwrap_or_default(),
+            }
+        }
+    }
+}
+
+pub mod error {
+    /// Errors that can occur when reading configs
+    #[derive(Debug)]
+    pub enum Config {
+        /// The config dir doesn't exist
+        NoConfigDir,
+        /// We didn't find a config file in the config dir
+        NoConfigFileFound,
+        /// An io error happened while reading/opening it!
+        IoError(std::io::Error),
+        /// The given extension (via an argument) isn't known.
+        ///
+        /// Occurs if the extension is neither `.json` nor `.ron` (including if there is no extension, in which case this will be `None`).
+        UnknownExtension(Option<String>),
+        /// Wrapper around an `Error` from `serde_json`
+        SerdeJsonError(serde_json::Error),
+        /// Wrapper around a `SpannedError` from `ron`
+        SerdeRonError(ron::error::SpannedError),
+    }
+
+    impl From<std::io::Error> for Config {
+        fn from(value: std::io::Error) -> Self {
+            Self::IoError(value)
+        }
+    }
+
+    impl From<serde_json::Error> for Config {
+        fn from(value: serde_json::Error) -> Self {
+            Self::SerdeJsonError(value)
+        }
+    }
+
+    impl From<ron::error::SpannedError> for Config {
+        fn from(value: ron::error::SpannedError) -> Self {
+            Self::SerdeRonError(value)
+        }
+    }
+}

crates/app/src/config/cli.rs

@@ -0,0 +1,20 @@
+use std::path::PathBuf;
+
+use clap::{builder::BoolishValueParser, ArgAction, Args};
+
+#[derive(Args)]
+pub(crate) struct CliConfigs {
+    /// How to actually run the pipeline.
+    /// Overrides the config file. Defaults to the debug evaluator.
+    #[arg(short, long)]
+    pub evaluator: Option<eval::Available>,
+
+    /// Read this config file.
+    #[arg(short, long)]
+    pub config_path: Option<PathBuf>,
+    /// Turn off the startup message.
+    ///
+    /// The startup message is not constant and depends on the time.
+    #[arg(long, env = "NO_STARTUP_MESSAGE", action = ArgAction::SetTrue, value_parser = BoolishValueParser::new())]
+    pub no_startup_message: bool,
+}

crates/app/src/config/config_file.rs

@@ -0,0 +1,61 @@
+use std::{
+    fs,
+    path::{Path, PathBuf},
+};
+
+use serde::{Deserialize, Serialize};
+
+use crate::error_reporting::{report_serde_json_err, report_serde_ron_err};
+
+use super::error::{self, Config};
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct Configs {
+    #[serde(default = "default_example_value")]
+    pub example_value: i32,
+    #[serde(default)]
+    pub no_startup_message: bool,
+    pub evaluator: Option<eval::Available>,
+}
+
+/// what the fuck serde why do i need this
+fn default_example_value() -> i32 {
+    43
+}
+
+/// Find the location of a config file and check if there is, in fact, a file
+pub(super) fn find_config_file() -> Result<PathBuf, Config> {
+    let Some(config_path) = dirs::config_dir() else {
+        return Err(Config::NoConfigDir);
+    };
+
+    let ron_path = config_path.with_file_name("config.ron");
+    let json_path = config_path.with_file_name("config.json");
+
+    if Path::new(&ron_path).exists() {
+        Ok(ron_path)
+    } else if Path::new(&json_path).exists() {
+        Ok(json_path)
+    } else {
+        Err(Config::NoConfigFileFound)
+    }
+}
+
+impl Configs {
+    pub fn read(p: PathBuf) -> Result<Self, error::Config> {
+        match p
+            .extension()
+            .map(|v| v.to_str().expect("config path to be UTF-8"))
+        {
+            Some("ron") => {
+                let f = fs::read_to_string(p)?;
+                ron::from_str(&f).or_else(|e| report_serde_ron_err(&f, &e))
+            }
+            Some("json") => {
+                let f = fs::read_to_string(p)?;
+                serde_json::from_str(&f).or_else(|e| report_serde_json_err(&f, &e))
+            }
+            e => Err(error::Config::UnknownExtension(e.map(str::to_owned))),
+        }
+    }
+}

crates/app/src/error_reporting.rs

@@ -0,0 +1,42 @@
+use std::process;
+
+use ron::error::Position;
+
+/// Report an `Error` from the `serde_json` crate
+pub fn report_serde_json_err(src: &str, err: &serde_json::Error) -> ! {
+    report_serde_err(src, err.line(), err.column(), err.to_string())
+}
+
+/// Report a `SpannedError` from the `ron` crate
+pub fn report_serde_ron_err(src: &str, err: &ron::error::SpannedError) -> ! {
+    let Position { line, col } = err.position;
+    report_serde_err(src, line, col, err.to_string())
+}
+
+/// Basic function for reporting serde type of errors
+fn report_serde_err(src: &str, line: usize, col: usize, msg: String) -> ! {
+    use ariadne::{Label, Report, Source};
+    let offset = try_reconstruct_loc(src, line, col);
+
+    Report::build(ariadne::ReportKind::Error, "test", offset)
+        .with_label(Label::new(("test", offset..offset)).with_message("Something went wrong here!"))
+        .with_message(msg)
+        .with_note("We'd like to give better errors, but serde errors are horrible to work with...")
+        .finish()
+        .eprint(("test", Source::from(src)))
+        .expect("writing error to stderr failed");
+    process::exit(1)
+}
+
+/// Reconstruct a byte offset from the line + column numbers typical from serde crates
+fn try_reconstruct_loc(src: &str, line_nr: usize, col_nr: usize) -> usize {
+    let (line_nr, col_nr) = (line_nr - 1, col_nr - 1);
+
+    src.lines()
+        .enumerate()
+        .fold(0, |acc, (i, line)| match i.cmp(&line_nr) {
+            std::cmp::Ordering::Less => acc + line.len() + 1,
+            std::cmp::Ordering::Equal => acc + col_nr,
+            std::cmp::Ordering::Greater => acc,
+        })
+}

crates/app/src/main.rs

@@ -0,0 +1,70 @@
+use std::{fs, path::PathBuf};
+
+use clap::{Parser, Subcommand};
+use config::{CliConfigs, Config};
+use dev::DevCommands;
+use welcome_msg::print_startup_msg;
+
+mod config;
+
+#[allow(unused)]
+mod error_reporting;
+mod welcome_msg;
+
+#[derive(Parser)]
+struct Args {
+    #[command(flatten)]
+    configs: CliConfigs,
+    #[command(subcommand)]
+    command: Commands,
+}
+
+#[derive(Subcommand)]
+enum Commands {
+    Run {
+        /// What file contains the pipeline to evaluate.
+        source: PathBuf,
+    },
+    Dev {
+        #[command(subcommand)]
+        command: DevCommands,
+    },
+}
+
+fn main() {
+    // TODO: proper error handling across the whole function
+    //       don't forget to also look inside `Config`
+    let args = Args::parse();
+    let cfg = Config::read(&args.configs);
+
+    if cfg.startup_msg {
+        print_startup_msg();
+    }
+
+    match args.command {
+        Commands::Run { source } => {
+            let source = fs::read_to_string(source).expect("can't find source file");
+            let ir = ir::from_ron(&source).expect("failed to parse source to graph ir");
+
+            let mut machine = cfg.evaluator.pick();
+            machine.feed(ir);
+            machine.eval_full();
+        }
+        Commands::Dev {
+            command: dev_command,
+        } => dev_command.run(),
+    }
+}
+
+mod dev {
+    use clap::Subcommand;
+
+    #[derive(Subcommand)]
+    pub(crate) enum DevCommands {}
+
+    impl DevCommands {
+        pub fn run(self) {
+            println!("There are currently no dev commands.");
+        }
+    }
+}

crates/app/src/welcome_msg.rs

@@ -0,0 +1,16 @@
+use time::{Month, OffsetDateTime};
+
+/// Print the startup message which changes depending on system time.
+pub fn print_startup_msg() {
+    // now or fallback to utc
+    let now = OffsetDateTime::now_local().unwrap_or_else(|_| OffsetDateTime::now_utc());
+
+    if now.month() == Month::June {
+        // pride startup message
+        println!("Hello, thanks for using iOwO and happy pride month!");
+        // TODO: proper link with explaination
+        println!("Why pride month is important in {}", now.year());
+    } else {
+        println!("Hello, thanks for using iOwO! :3");
+    }
+}

crates/eval/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "eval"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+clap = { workspace = true, features = [ "derive" ] }
+image = "0.24"
+ir = { path = "../ir" }
+serde = { workspace = true }
+
+[lints]
+workspace = true

crates/eval/src/kind/debug/instr/mod.rs

@@ -0,0 +1,45 @@
+pub mod read {
+    use image::{io::Reader as ImageReader, DynamicImage};
+    use ir::instruction::read::{Read, SourceType};
+
+    pub fn read(Read { source }: Read) -> DynamicImage {
+        // TODO: actual error handling
+        let img = ImageReader::open(match source {
+            SourceType::File(path) => path,
+        })
+        .expect("something went wrong :(((");
+
+        img.decode().expect("couldn't decode image")
+    }
+}
+
+pub mod write {
+    use image::{DynamicImage, ImageFormat};
+    use ir::instruction::write::{TargetFormat, TargetType, Write};
+
+    pub fn write(Write { target, format }: Write, input_data: &DynamicImage) {
+        // TODO: actual error handling
+        input_data
+            .save_with_format(
+                match target {
+                    TargetType::File(path) => path,
+                },
+                match format {
+                    TargetFormat::Jpeg => ImageFormat::Jpeg,
+                    TargetFormat::Png => ImageFormat::Png,
+                },
+            )
+            .expect("couldn't save file");
+    }
+}
+
+pub mod filters {
+    pub mod invert {
+        use image::DynamicImage;
+
+        pub fn invert(mut input_data: DynamicImage) -> DynamicImage {
+            input_data.invert();
+            input_data
+        }
+    }
+}

crates/eval/src/kind/debug/mod.rs

@@ -0,0 +1,105 @@
+use ir::{
+    id,
+    instruction::{Filter, Kind},
+    GraphIr, Instruction, Map,
+};
+
+use crate::value::Variant;
+mod instr;
+
+#[derive(Debug, Default)]
+pub struct Evaluator {
+    ir: GraphIr,
+
+    /// What the output of each individual streamer, and as result its output sockets, is.
+    /// Grows larger as evaluation continues,
+    /// as there's no mechanism for purging never-to-be-used-anymore instructions yet.
+    evaluated: Map<id::Output, Variant>,
+}
+
+impl crate::Evaluator for Evaluator {
+    fn feed(&mut self, ir: GraphIr) {
+        self.ir = ir;
+        self.evaluated.clear();
+    }
+
+    fn eval_full(&mut self) {
+        // GraphIr::topological_sort returns InstructionRefs, which are mostly cool
+        // but we'd like to have them owned, so we can call Self::step without lifetime hassle
+        let queue: Vec<Instruction> = self
+            .ir
+            .topological_sort()
+            .into_iter()
+            .map(Into::into)
+            .collect();
+
+        for instr in queue {
+            self.step(instr);
+        }
+    }
+}
+
+impl Evaluator {
+    #[allow(clippy::needless_pass_by_value)]
+    fn step(&mut self, instr: Instruction) {
+        // what inputs does this instr need? fetch them
+        let inputs: Vec<_> = instr
+            .input_sources()
+            .iter()
+            .map(|source| {
+                let source_socket = source
+                    .as_ref()
+                    .expect("all inputs to be connected when an instruction is ran");
+                self.evaluated
+                    .get(source_socket)
+                    .expect("toposort to yield later instrs only after previous ones")
+            })
+            .collect();
+
+        // then actually do whatever the instruction should do
+        // NOTE: makes heavy use of index slicing,
+        // on the basis that ir::instruction::Kind::socket_count is correct
+        // TODO: make this a more flexible dispatch-ish arch
+        let output = match instr.kind {
+            Kind::Read(details) => Some(Variant::Image(instr::read::read(details))),
+            Kind::Write(details) => {
+                #[allow(irrefutable_let_patterns)] // will necessarily change
+                let Variant::Image(input) = inputs[0] else {
+                    panic!("cannot only write images, but received: `{:?}`", inputs[0]);
+                };
+                instr::write::write(details, input);
+                None
+            }
+            Kind::Math(_) => todo!(),
+            Kind::Blend(_) => todo!(),
+            Kind::Noise(_) => todo!(),
+            Kind::Filter(filter_instruction) => match filter_instruction {
+                Filter::Invert => {
+                    #[allow(irrefutable_let_patterns)]
+                    let Variant::Image(input) = inputs[0] else {
+                        panic!(
+                            "cannot only filter invert images, but received: `{:?}`",
+                            inputs[0]
+                        );
+                    };
+
+                    Some(Variant::Image(instr::filters::invert::invert(
+                        input.clone(),
+                    )))
+                }
+            },
+        };
+
+        if let Some(output) = output {
+            // TODO: very inaccurate, actually respect individual instructions.
+            //       should be implied by a different arch
+            // TODO: all of those should not be public, offer some methods to get this on
+            //       `Instruction` instead (can infer short-term based on Kind::socket_count)
+            let socket = id::Output(id::Socket {
+                belongs_to: instr.id,
+                idx: id::SocketIdx(0),
+            });
+            self.evaluated.insert(socket, output);
+        }
+    }
+}

crates/eval/src/kind/mod.rs

@@ -0,0 +1 @@
+pub mod debug;

crates/eval/src/lib.rs

@@ -0,0 +1,43 @@
+use ir::GraphIr;
+
+mod kind;
+mod value;
+
+/// Can collapse a [`GraphIr`] in meaningful ways and do interesting work on it.
+///
+/// It's surprisingly difficult to find a fitting description for this.
+pub trait Evaluator {
+    /// Take some [`GraphIr`] which will then be processed later.
+    /// May be called multiple times, in which the [`GraphIr`]s should add up.
+    // TODO: atm they definitely don't add up -- add some functionality to GraphIr to
+    //       make it combine two graphs into one
+    fn feed(&mut self, ir: GraphIr);
+
+    /// Walk through the _whole_ [`GraphIr`] and run through each instruction.
+    fn eval_full(&mut self);
+
+    // TODO: for an LSP or the like, eval_single which starts at a given instr
+}
+
+/// The available [`Evaluator`]s.
+///
+/// Checklist for adding new ones:
+///
+/// 1. Create a new module under the [`kind`] module.
+/// 2. Add a struct and implement [`Evaluator`] for it.
+#[derive(Clone, Copy, Debug, Default, clap::ValueEnum, serde::Deserialize, serde::Serialize)]
+pub enum Available {
+    /// Runs fully on the CPU. Single-threaded, debug-friendly and quick to implement.
+    #[default]
+    Debug,
+}
+
+impl Available {
+    /// Selects the [`Evaluator`] corresponding to this label.
+    #[must_use]
+    pub fn pick(&self) -> Box<dyn Evaluator> {
+        match self {
+            Self::Debug => Box::<kind::debug::Evaluator>::default(),
+        }
+    }
+}

crates/eval/src/value/mod.rs

@@ -0,0 +1,12 @@
+use image::DynamicImage;
+
+/// Any runtime value that an instruction can input or output.
+///
+/// The name is taken from [Godot's `Variant` type],
+/// which is very similar to this one.
+///
+/// [Godot's `Variant` type]: https://docs.godotengine.org/en/stable/classes/class_variant.html
+#[derive(Clone, Debug)]
+pub enum Variant {
+    Image(DynamicImage),
+}

crates/executor-poc/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "executor-poc"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+image = "0.25.1"
+indexmap = "2.2.6"
+nalgebra = "0.33.0"
+petgraph.workspace = true
+
+[lints]
+workspace = true

crates/executor-poc/src/lib.rs

@@ -0,0 +1,128 @@
+use indexmap::IndexMap;
+use instructions::Instruction;
+use petgraph::graph::DiGraph;
+use types::Type;
+
+trait Node {
+    fn inputs() -> IndexMap<String, Type>;
+    fn outputs() -> IndexMap<String, Type>;
+}
+
+struct NodeGraph {
+    graph: DiGraph<Instruction, TypedEdge>,
+}
+
+struct TypedEdge {
+    from: String,
+    to: String,
+    typ: Type,
+}
+
+mod instructions {
+    //! This is the lowest level of the IR, the one the executor will use.
+
+    use std::path::Path;
+
+    use indexmap::{indexmap, IndexMap};
+    pub enum Instruction {
+        // File handling
+        LoadFile,
+        SaveFile,
+
+        ColorMatrix,
+        PosMatrix,
+
+        Blend,
+        SplitChannels,
+    }
+
+    impl Instruction {
+        fn inputs(&self) -> IndexMap<String, Type> {
+            match self {
+                Instruction::LoadFile => indexmap! {
+                    "path" => Type::Path
+                },
+                Instruction::SaveFile => indexmap! {
+                    "path" => Type::Path
+                },
+
+                Instruction::ColorMatrix => indexmap! {
+                    "image" => Type::ImageData,
+                    "matrix" => Type::Mat(4,5)
+                },
+                Instruction::PosMatrix => indexmap! {
+                    "image" => Type::ImageData,
+                    "matrix" => Type::Mat(2, 3),
+                },
+
+                Instruction::Blend => todo!(),
+                Instruction::SplitChannels => todo!(),
+            }
+        }
+        fn outputs(&self) -> IndexMap<String, Type> {
+            match self {
+                Instruction::LoadFile => indexmap! {
+                    "image" => Type::ImageData
+                },
+                Instruction::SaveFile => indexmap! {},
+
+                Instruction::ColorMatrix => indexmap! {
+                    "resut" => Type::ImageData
+                },
+                Instruction::PosMatrix => todo!(),
+
+                Instruction::Blend => todo!(),
+                Instruction::SplitChannels => todo!(),
+            }
+        }
+    }
+}
+
+mod types {
+    pub enum Type {
+        // TODO: later do lower level type system for this stuff?
+        // Image(Size, PixelType),
+        // // image data for processing.
+        // // always PixelType::Rgba32F
+        // ImageData(Size),
+        // // stuff that's still to be generated, not sized and no pixeltype
+        // ProceduralImage,
+        ImageData,
+        Text,
+        Integer,
+        Float,
+        Double,
+        Path,
+        Bool,
+        Vec(
+            // length,
+            u8,
+        ),
+        Mat(
+            // Rows
+            u8,
+            // Columns
+            u8,
+        ),
+    }
+
+    // pub struct Size {
+    //     width: u16,
+    //     height: u16,
+    // }
+
+    // Pixel types. Taken from variants [here](https://docs.rs/image/latest/image/pub enum.DynamicImage.html).
+    // pub enum PixelType {
+    //     Luma8,
+    //     LumaA8,
+    //     Rgb8,
+    //     Rgba8,
+    //     Luma16,
+    //     LumaA16,
+    //     Rgb16,
+    //     Rgba16,
+    //     Rgb32F,
+    //     #[default]
+    //     Rgba32F,
+    // }
+}

crates/ir/Cargo.toml

@@ -0,0 +1,14 @@
+[package]
+name = "ir"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+either = "1.9"
+ron = "0.8"
+serde = { version = "1.0.193", features = ["derive"] }
+
+[lints]
+workspace = true

crates/ir/src/id.rs

@@ -0,0 +1,84 @@
+//! Instance identification for instructions and their glue.
+//!
+//! Instructions as defined in [`crate::instruction::Kind`] and descendants are very useful,
+//! but they cannot be directly used as vertices in the graph IR,
+//! as there may easily be multiple instructions of the same kind in the same program.
+//!
+//! Instead, this module offers an alternative way to refer to specific instances:
+//!
+//! - [`Instruction`]s are effectively just a number floating in space,
+//!   incremented each time a new instruction is referred to.
+//! - [`Socket`]s contain
+//!   - what [`Instruction`] they belong to
+//!   - which index they occupy on it
+//!
+//!   The distinction between [`Input`] and [`Output`] is implemented
+//!   as them being different types.
+
+use std::fmt;
+
+use serde::{Deserialize, Serialize};
+
+/// One specific instruction.
+///
+/// It does **not** contain what kind of instruction this is.
+/// Refer to [`crate::instruction::Kind`] for this instead.
+#[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
+pub struct Instruction(pub(super) u64);
+
+impl fmt::Debug for Instruction {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "InstrId {}", self.0)
+    }
+}
+
+/// On an **instruction**, accepts incoming data.
+///
+/// An **instruction** cannot run if any of these are not connected.
+#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
+pub struct Input(pub(super) Socket);
+
+impl Input {
+    #[must_use]
+    pub fn socket(&self) -> &Socket {
+        &self.0
+    }
+}
+
+/// On an **instruction**, returns outgoing data to be fed to [`Input`]s.
+///
+/// In contrast to [`Input`]s, [`Output`]s may be used or unused.
+#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
+pub struct Output(pub Socket); // TODO: Restrict publicness to super
+
+impl Output {
+    #[must_use]
+    pub fn socket(&self) -> &Socket {
+        &self.0
+    }
+}
+
+/// An unspecified socket on a specific **instruction**,
+/// and where it is on that **instruction**.
+#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
+pub struct Socket {
+    pub belongs_to: Instruction,
+    pub idx: SocketIdx,
+}
+
+/// Where a [`Socket`] is on one **instruction**.
+///
+/// Note that this does **not** identify a [`Socket`] globally.
+/// There may be multiple [`Socket`]s sharing the same [`SocketIdx`],
+/// but on different [`Instruction`]s.
+///
+/// This really only serves for denoting where a socket is,
+/// when it's already clear which instruction is referred to.
+#[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
+pub struct SocketIdx(pub u16); // TODO: Restrict publicness to super
+
+impl fmt::Debug for SocketIdx {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.0.fmt(f)
+    }
+}

crates/ir/src/instruction/mod.rs

@@ -0,0 +1,81 @@
+use serde::{Deserialize, Serialize};
+
+pub mod read;
+pub mod write;
+
+#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
+pub enum Kind {
+    // TODO: `read::Read` and `write::Write` hold real values atm -- they should actually
+    //       point to `Const` instructions instead (which are... yet to be done...)
+    Read(read::Read),
+    Write(write::Write),
+    Math(Math),
+    Blend(Blend),
+    Noise(Noise),
+    Filter(Filter),
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
+pub enum Math {
+    Add,
+    Subtract,
+    Multiply,
+    Divide,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
+pub enum Blend {
+    Normal,
+    Multiply,
+    Additive,
+    Overlay,
+    Screen,
+    Subtractive,
+    Difference,
+    Darken,
+    Lighten,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
+pub enum Noise {
+    Perlin,
+    Simplex,
+    Voronoi,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
+pub enum Filter {
+    Invert,
+}
+
+// TODO: given that this basically matches on all instructions, we may need to use
+//       the visitor pattern in future here, or at least get them behind traits
+//       which should allow far more nuanced description
+impl Kind {
+    /// Returns how many sockets this kind of instruction has.
+    #[must_use]
+    pub fn socket_count(&self) -> SocketCount {
+        match self {
+            Self::Read(_) => (0, 1),
+            Self::Write(_) => (1, 0),
+            Self::Math(_) | Self::Blend(_) => (2, 1),
+            Self::Noise(_) => {
+                todo!("how many arguments does noise take? how many outputs does it have?")
+            }
+            Self::Filter(Filter::Invert) => (1, 1),
+        }
+        .into()
+    }
+}
+
+/// How many sockets are on an instruction?
+pub struct SocketCount {
+    pub inputs: u16,
+    pub outputs: u16,
+}
+
+impl From<(u16, u16)> for SocketCount {
+    fn from((inputs, outputs): (u16, u16)) -> Self {
+        Self { inputs, outputs }
+    }
+}

crates/ir/src/instruction/read.rs

@@ -0,0 +1,12 @@
+use serde::{Deserialize, Serialize};
+use std::path::PathBuf;
+
+#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
+pub struct Read {
+    pub source: SourceType,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
+pub enum SourceType {
+    File(PathBuf),
+}

crates/ir/src/instruction/write.rs

@@ -0,0 +1,19 @@
+use serde::{Deserialize, Serialize};
+use std::path::PathBuf;
+
+#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
+pub struct Write {
+    pub target: TargetType,
+    pub format: TargetFormat,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
+pub enum TargetType {
+    File(PathBuf),
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
+pub enum TargetFormat {
+    Jpeg,
+    Png,
+}

crates/ir/src/lib.rs

@@ -0,0 +1,353 @@
+use std::num::NonZeroUsize;
+
+use instruction::SocketCount;
+use serde::{Deserialize, Serialize};
+
+pub mod id;
+pub mod instruction;
+pub mod semi_human;
+
+pub type Map<K, V> = std::collections::BTreeMap<K, V>;
+pub type Set<T> = std::collections::BTreeSet<T>;
+
+/// Gives you a super well typed graph IR for a given human-readable repr.
+///
+/// Look at [`semi_human::GraphIr`] and the test files in the repo at `testfiles/`
+/// to see what the RON should look like.
+/// No, we don't want you to write out [`GraphIr`] in full by hand.
+/// That's something for the machines to do.
+///
+/// # Errors
+///
+/// Returns an error if the parsed source is not a valid human-readable graph IR.
+pub fn from_ron(source: &str) -> ron::error::SpannedResult<GraphIr> {
+    let human_repr: semi_human::GraphIr = ron::from_str(source)?;
+    Ok(human_repr.into())
+}
+
+/// The toplevel representation of a whole pipeline.
+///
+/// # DAGs
+///
+/// Pipelines may not be fully linear. They may branch out and recombine later on.
+/// As such, the representation for them which is currently used is a
+/// [**D**irected **A**cyclic **G**raph](https://en.wikipedia.org/wiki/Directed_acyclic_graph).
+///
+/// For those who are already familiar with graphs, a DAG is one, except that:
+///
+/// - It is **directed**: Edges have a direction they point to.
+///   In this case, edges point from the outputs of streamers to inputs of consumers.
+/// - It is **acyclic**: Those directed edges may not form loops.
+///   In other words, if one follows edges only in their direction, it must be impossible
+///   to come back to an already visited node.
+///
+/// Here, if an edge points from _A_ to _B_ (`A --> B`),
+/// then _A_ is called a **dependency** or an **input source** of _B_,
+/// and _B_ is called a **dependent** or an **output target** of _A_.
+///
+/// The DAG also enables another neat operation:
+/// [Topological sorting](https://en.wikipedia.org/wiki/Topological_sorting).
+/// This allows to put the entire graph into a linear list,
+/// where it's guaranteed that once a vertex is visited,
+/// all dependencies of it will have been visited already as well.
+///
+/// The representation used here in specific is a bit more complicated,
+/// since **instructions** directly aren't just connected to one another,
+/// but their **sockets** are instead.
+///
+/// So the vertices of the DAG are the **sockets**
+/// (which are either [`id::Input`] or [`id::Output`] depending on the direction),
+/// and each **socket** in turn belongs to an **instruction**.
+///
+/// # Usage
+///
+/// - If you want to build one from scratch,
+///   add a few helper methods like
+///     constructing an empty one,
+///     adding instructions and
+///     adding edges
+/// - If you want to construct one from an existing repr,
+///   maybe you want to use [`semi_human::GraphIr`].
+///
+/// # Storing additional data
+///
+/// Chances are the graph IR seems somewhat fit to put metadata in it.
+/// However, most likely you're interacting in context of some other system,
+/// and also want to manage and index that data on your own.
+///
+/// As such, consider using _secondary_ maps instead.
+/// That is, store in a data structure _you_ own a mapping
+/// from [`id`]s
+/// to whatever data you need.
+#[derive(Clone, Debug, Default, PartialEq, Eq, Deserialize, Serialize)]
+pub struct GraphIr {
+    /// "Backbone" storage of all **instruction** IDs to
+    /// what **kind of instruction** they are.
+    instructions: Map<id::Instruction, instruction::Kind>,
+
+    /// How the data flows forward. **Dependencies** map to **dependents** here.
+    edges: Map<id::Output, Set<id::Input>>,
+    /// How the data flows backward. **Dependents** map to **dependencies** here.
+    rev_edges: Map<id::Input, id::Output>,
+}
+
+// TODO: this impl block, but actually the whole module, screams for tests
+impl GraphIr {
+    /// Look "backwards" in the graph,
+    /// and find out what instructions need to be done before this one.
+    /// The input slots are visited in order.
+    ///
+    /// - The iterator returns individually [`Some`]`(`[`None`]`)` if the corresponding slot is
+    ///   not connected.
+    ///
+    /// The same caveats as for [`GraphIr::resolve`] apply.
+    #[must_use]
+    pub fn input_sources(
+        &self,
+        subject: &id::Instruction,
+    ) -> Option<impl Iterator<Item = Option<&id::Output>> + '_> {
+        let (subject, kind) = self.instructions.get_key_value(subject)?;
+        let SocketCount { inputs, .. } = kind.socket_count();
+
+        Some((0..inputs).map(|idx| {
+            let input = id::Input(socket(subject, idx));
+            self.rev_edges.get(&input)
+        }))
+    }
+
+    /// Look "forwards" in the graph to see what other instructions this instruction feeds into.
+    ///
+    /// The output slots represent the top-level iterator,
+    /// and each one's connections are emitted one level below.
+    ///
+    /// Just [`Iterator::flatten`] if you are not interested in the slots.
+    ///
+    /// The same caveats as for [`GraphIr::resolve`] apply.
+    #[must_use]
+    pub fn output_targets(
+        &self,
+        subject: &id::Instruction,
+    ) -> Option<impl Iterator<Item = Option<&Set<id::Input>>> + '_> {
+        let (subject, kind) = self.instructions.get_key_value(subject)?;
+        let SocketCount { outputs, .. } = kind.socket_count();
+
+        Some((0..outputs).map(|idx| {
+            let output = id::Output(socket(subject, idx));
+            self.edges.get(&output)
+        }))
+    }
+
+    /// Returns the instruction corresponding to the given ID.
+    /// Returns [`None`] if there is no such instruction in this graph IR.
+    ///
+    /// Theoretically this could be fixed easily at the expense of some memory
+    /// by just incrementing and storing some global counter,
+    /// however, at the moment there's no compelling reason
+    /// to actually have multiple [`GraphIr`]s at one point in time.
+    /// Open an issue if that poses a problem for you.
+    #[must_use]
+    pub fn resolve<'ir>(&'ir self, subject: &id::Instruction) -> Option<InstructionRef<'ir>> {
+        let (id, kind) = self.instructions.get_key_value(subject)?;
+
+        let input_sources = self.input_sources(subject)?.collect();
+        let output_targets = self.output_targets(subject)?.collect();
+
+        Some(InstructionRef {
+            id,
+            kind,
+            input_sources,
+            output_targets,
+        })
+    }
+
+    /// Returns the instruction this input belongs to.
+    ///
+    /// The same caveats as for [`GraphIr::resolve`] apply.
+    #[must_use]
+    pub fn owner_of_input<'ir>(&'ir self, input: &id::Input) -> Option<InstructionRef<'ir>> {
+        self.resolve(&input.socket().belongs_to)
+    }
+
+    /// Returns the instruction this output belongs to.
+    ///
+    /// The same caveats as for [`GraphIr::resolve`] apply.
+    #[must_use]
+    pub fn owner_of_output<'ir>(&'ir self, output: &id::Output) -> Option<InstructionRef<'ir>> {
+        self.resolve(&output.socket().belongs_to)
+    }
+
+    /// Returns the order in which the instructions could be visited
+    /// in order to ensure that all dependencies are resolved
+    /// before a vertex is visited.
+    ///
+    /// # Panics
+    ///
+    /// Panics if there are any cycles in the IR, as it needs to be a DAG.
+    #[must_use]
+    // yes, this function could probably return an iterator and be lazy
+    // no, not today
+    pub fn topological_sort(&self) -> Vec<InstructionRef> {
+        // count how many incoming edges each vertex has
+        let mut nonzero_input_counts: Map<_, NonZeroUsize> =
+            self.rev_edges
+                .iter()
+                .fold(Map::new(), |mut count, (input, _)| {
+                    let _ = *count
+                        .entry(input.socket().belongs_to.clone())
+                        .and_modify(|count| *count = count.saturating_add(1))
+                        .or_insert(NonZeroUsize::MIN);
+                    count
+                });
+
+        // are there any unconnected ones we could start with?
+        // TODO: experiment if a VecDeque with some ordering fun is digested better by the executor
+        let no_inputs: Vec<_> = {
+            let nonzero: Set<_> = nonzero_input_counts.keys().collect();
+            let all: Set<_> = self.instructions.keys().collect();
+            all.difference(&nonzero).copied().cloned().collect()
+        };
+
+        // then let's find the order!
+        let mut order = Vec::new();
+        let mut active_queue = no_inputs;
+
+        while let Some(current) = active_queue.pop() {
+            // now that this vertex is visited and resolved,
+            // make sure all dependents notice that
+
+            let dependents = self
+                .output_targets(&current)
+                .expect("graph to be consistent")
+                .flatten()
+                .flatten();
+
+            for dependent_input in dependents {
+                let dependent = &dependent_input.socket().belongs_to;
+
+                // how many inputs are connected to this dependent without us?
+                let count = nonzero_input_counts
+                    .get_mut(dependent)
+                    .expect("connected output must refer to non-zero input");
+
+                let new = NonZeroUsize::new(count.get() - 1);
+                if let Some(new) = new {
+                    // aww, still some
+                    *count = new;
+                    continue;
+                }
+
+                // none, that means this one is free now! let's throw it onto the active queue then
+                let (now_active, _) = nonzero_input_counts
+                    .remove_entry(dependent)
+                    .expect("connected output must refer to non-zero input");
+                active_queue.push(now_active);
+            }
+
+            // TODO: check if this instruction is "well-fed", that is, has all the inputs it needs,
+            //       and if not, panic
+            order.push(self.resolve(&current).expect("graph to be consistent"));
+        }
+
+        assert!(
+            nonzero_input_counts.is_empty(),
+            concat!(
+                "topological sort didn't cover all instructions\n",
+                "either there are unconnected inputs, or there is a cycle\n",
+                "unresolved instructions:\n",
+                "{:#?}"
+            ),
+            nonzero_input_counts,
+        );
+
+        order
+    }
+}
+
+/// Constructs an [`id::Socket`] a bit more tersely.
+fn socket(id: &id::Instruction, idx: u16) -> id::Socket {
+    id::Socket {
+        belongs_to: id.clone(),
+        idx: id::SocketIdx(idx),
+    }
+}
+
+/// A full instruction bundeled in context, with its inputs and outputs.
+#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord)]
+pub struct Instruction {
+    pub id: id::Instruction,
+    pub kind: instruction::Kind,
+
+    // can't have these two public since then a user might corrupt their length
+    input_sources: Vec<Option<id::Output>>,
+    output_targets: Vec<Set<id::Input>>,
+}
+
+impl Instruction {
+    /// Where this instruction gets its inputs from.
+    ///
+    /// [`None`] means that this input is unfilled,
+    /// and must be filled before the instruction can be ran.
+    #[must_use]
+    pub fn input_sources(&self) -> &[Option<id::Output>] {
+        &self.input_sources
+    }
+
+    /// To whom outputs are sent.
+    #[must_use]
+    pub fn output_targets(&self) -> &[Set<id::Input>] {
+        &self.output_targets
+    }
+}
+
+/// [`Instruction`], but every single field is borrowed instead.
+/// See its docs.
+///
+/// Use the [`From`] impl to handily convert into an [`Instruction`].
+/// The other way around is unlikely to be wanted — since you already have an [`Instruction`],
+/// chances are you just want to take a reference (`&`) of it.
+#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord)]
+pub struct InstructionRef<'ir> {
+    pub id: &'ir id::Instruction,
+    pub kind: &'ir instruction::Kind,
+
+    input_sources: Vec<Option<&'ir id::Output>>,
+    output_targets: Vec<Option<&'ir Set<id::Input>>>,
+}
+
+impl<'ir> InstructionRef<'ir> {
+    /// Where this instruction gets its inputs from.
+    ///
+    /// [`None`] means that this input is unfilled,
+    /// and must be filled before the instruction can be ran.
+    #[must_use]
+    pub fn input_sources(&self) -> &[Option<&'ir id::Output>] {
+        &self.input_sources
+    }
+
+    /// To whom outputs are sent.
+    #[must_use]
+    pub fn output_targets(&self) -> &[Option<&'ir Set<id::Input>>] {
+        &self.output_targets
+    }
+}
+
+// would love to use ToOwned but Rust has no specialization yet
+// and it'd hurt a blanket impl of ToOwned otherwise
+impl From<InstructionRef<'_>> for Instruction {
+    fn from(source: InstructionRef<'_>) -> Self {
+        Self {
+            id: source.id.clone(),
+            kind: source.kind.clone(),
+            input_sources: source
+                .input_sources
+                .into_iter()
+                .map(Option::<&_>::cloned)
+                .collect(),
+            output_targets: source
+                .output_targets
+                .into_iter()
+                .map(|outputs| outputs.map(Clone::clone).unwrap_or_default())
+                .collect(),
+        }
+    }
+}

crates/ir/src/semi_human.rs

@@ -0,0 +1,87 @@
+//! The midterm solution for source representation, until we've got a nice source frontend.
+//!
+//! Sacrifices type expressivity for the sake of typability in [RON] files.
+//!
+//! **If you want to construct a graph IR programmatically,
+//! use [`crate::GraphIr`] directly instead,
+//! as it gives you more control to specify where your instructions came from.**
+//!
+//! [RON]: https://docs.rs/ron/latest/ron/
+
+use serde::{Deserialize, Serialize};
+
+use crate::{id, instruction, Map, Set};
+
+/// Semi-human-{read,writ}able [`crate::GraphIr`] with far less useful types.
+///
+/// **Do not use this if you want to programatically construct IR.**
+/// Instead, directly use [`crate::GraphIr`].
+#[derive(Clone, Debug, PartialEq, Eq, Deserialize, Serialize)]
+pub struct GraphIr {
+    /// See [`crate::GraphIr::instructions`], just that a simple number is used for the ID instead
+    pub(crate) instructions: Map<u64, instruction::Kind>,
+    /// See [`crate::GraphIr::edges`], the forward edges.
+    /// RON wants you to type the set as if it were a list.
+    pub(crate) edges: Map<Socket, Set<Socket>>,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Deserialize, Serialize)]
+pub struct Socket {
+    /// ID of the instruction this socket is on.
+    pub(crate) on: u64,
+    pub(crate) idx: u16,
+}
+
+impl From<Socket> for id::Socket {
+    fn from(source: Socket) -> Self {
+        Self {
+            belongs_to: id::Instruction(source.on),
+            idx: id::SocketIdx(source.idx),
+        }
+    }
+}
+
+impl From<GraphIr> for crate::GraphIr {
+    fn from(source: GraphIr) -> Self {
+        let edges = source.edges.clone();
+        Self {
+            instructions: source
+                .instructions
+                .into_iter()
+                .map(|(id, kind)| (id::Instruction(id), kind))
+                .collect(),
+            edges: type_edges(source.edges),
+            rev_edges: reverse_and_type_edges(edges),
+        }
+    }
+}
+
+fn type_edges(edges: Map<Socket, Set<Socket>>) -> Map<id::Output, Set<id::Input>> {
+    edges
+        .into_iter()
+        .map(|(output, inputs)| {
+            let output = id::Output(output.into());
+            let inputs = inputs.into_iter().map(Into::into).map(id::Input).collect();
+            (output, inputs)
+        })
+        .collect()
+}
+
+fn reverse_and_type_edges(edges: Map<Socket, Set<Socket>>) -> Map<id::Input, id::Output> {
+    edges
+        .into_iter()
+        .fold(Map::new(), |mut rev_edges, (output, inputs)| {
+            let output = id::Output(output.into());
+
+            for input in inputs {
+                let input = id::Input(input.into());
+                let previous = rev_edges.insert(input, output.clone());
+                if let Some(previous) = previous {
+                    // TODO: handle this with a TryFrom impl
+                    panic!("two or more outputs referred to the same input {previous:#?}");
+                }
+            }
+
+            rev_edges
+        })
+}

crates/json-pawarser/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "json-pawarser"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+logos = "0.14.2"
+enumset = "1.1.3"
+rowan = "0.15.15"
+pawarser = { path = "../pawarser" }
+
+[lints]
+workspace = true

crates/json-pawarser/src/grammar.rs

@@ -0,0 +1,78 @@
+use array::array;
+use enumset::{enum_set, EnumSet};
+use pawarser::parser::ParserBuilder;
+
+use crate::{
+    syntax_error::SyntaxError,
+    syntax_kind::{lex, SyntaxKind},
+};
+
+use self::object::object;
+
+mod array;
+mod object;
+
+pub(crate) type Parser<'src> = pawarser::Parser<'src, SyntaxKind, SyntaxError>;
+pub(crate) type CompletedMarker = pawarser::CompletedMarker<SyntaxKind, SyntaxError>;
+
+const BASIC_VALUE_TOKENS: EnumSet<SyntaxKind> =
+    enum_set!(SyntaxKind::BOOL | SyntaxKind::NULL | SyntaxKind::NUMBER | SyntaxKind::STRING);
+
+pub fn value(p: &mut Parser) -> bool {
+    if BASIC_VALUE_TOKENS.contains(p.current()) {
+        p.do_bump();
+        return true;
+    } else {
+        object(p).or_else(|| array(p)).is_some()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::{
+        test_utils::{check_parser, gen_checks},
+        value,
+    };
+
+    #[test]
+    fn value_lit() {
+        gen_checks! {value;
+            r#""helo world""# => r#"ROOT { STRING "\"helo world\""; }"#,
+            "42"              => r#"ROOT { NUMBER "42"; }"#,
+            "null"            => r#"ROOT { NULL "null"; }"#,
+            "true"            => r#"ROOT { BOOL "true"; }"#,
+            "false"           => r#"ROOT { BOOL "false"; }"#
+        };
+    }
+}
+
+#[cfg(test)]
+mod test_utils {
+    use pawarser::parser::ParserBuilder;
+
+    use crate::syntax_kind::{lex, SyntaxKind};
+
+    use super::Parser;
+
+    macro_rules! gen_checks {
+        ($fn_to_test:ident; $($in:literal => $out:literal),+) => {
+            $(crate::grammar::test_utils::check_parser($in, |p| { $fn_to_test(p); }, $out);)+
+        }
+    }
+
+    pub(super) use gen_checks;
+
+    pub(super) fn check_parser(input: &str, parser_fn: fn(&mut Parser), expected_output: &str) {
+        let toks = lex(input);
+        let mut p: Parser = ParserBuilder::new(toks)
+            .add_meaningless(SyntaxKind::WHITESPACE)
+            .add_meaningless(SyntaxKind::NEWLINE)
+            .build();
+
+        parser_fn(&mut p);
+
+        let out = p.finish();
+
+        assert_eq!(format!("{out:?}").trim_end(), expected_output);
+    }
+}

crates/json-pawarser/src/grammar/array.rs

@@ -0,0 +1,36 @@
+use crate::{syntax_error::SyntaxError, syntax_kind::SyntaxKind};
+
+use super::{value, CompletedMarker, Parser};
+
+pub(super) fn array(p: &mut Parser) -> Option<CompletedMarker> {
+    let array_start = p.start("array");
+
+    if !p.eat(SyntaxKind::BRACKET_OPEN) {
+        array_start.abandon(p);
+        return None;
+    }
+
+    let el = p.start("arr_el");
+    value(p);
+    el.complete(p, SyntaxKind::ELEMENT);
+
+    while p.at(SyntaxKind::COMMA) {
+        let potential_trailing_comma = p.start("potential_trailing_comma");
+
+        p.eat(SyntaxKind::COMMA);
+        let maybe_el = p.start("arr_el");
+        if !value(p) {
+            maybe_el.abandon(p);
+            potential_trailing_comma.complete(p, SyntaxKind::TRAILING_COMMA);
+        } else {
+            maybe_el.complete(p, SyntaxKind::ELEMENT);
+            potential_trailing_comma.abandon(p);
+        }
+    }
+
+    Some(if !p.eat(SyntaxKind::BRACKET_CLOSE) {
+        array_start.error(p, SyntaxError::UnclosedArray)
+    } else {
+        array_start.complete(p, SyntaxKind::ARRAY)
+    })
+}

crates/json-pawarser/src/grammar/object.rs

@@ -0,0 +1,92 @@
+use crate::{grammar::value, syntax_error::SyntaxError, syntax_kind::SyntaxKind};
+
+use super::{CompletedMarker, Parser, BASIC_VALUE_TOKENS};
+
+pub(super) fn object(p: &mut Parser) -> Option<CompletedMarker> {
+    let obj_start = p.start("object");
+
+    if !p.eat(SyntaxKind::BRACE_OPEN) {
+        obj_start.abandon(p);
+        return None;
+    }
+
+    member(p);
+    while p.at(SyntaxKind::COMMA) {
+        // not always an error, later configurable
+        let potential_trailing_comma = p.start("potential_trailing_comma");
+        p.eat(SyntaxKind::COMMA);
+
+        if member(p).is_none() {
+            potential_trailing_comma.complete(p, SyntaxKind::TRAILING_COMMA);
+        } else {
+            potential_trailing_comma.abandon(p);
+        }
+    }
+
+    Some(if p.eat(SyntaxKind::BRACE_CLOSE) {
+        obj_start.complete(p, SyntaxKind::OBJECT)
+    } else {
+        obj_start.error(p, SyntaxError::UnclosedObject)
+    })
+}
+
+fn member(p: &mut Parser) -> Option<CompletedMarker> {
+    let member_start = p.start("member");
+
+    if p.at(SyntaxKind::BRACE_CLOSE) {
+        member_start.abandon(p);
+        return None;
+    } else if p.at(SyntaxKind::STRING) {
+        let member_name_start = p.start("member_name");
+        p.eat(SyntaxKind::STRING);
+        member_name_start.complete(p, SyntaxKind::MEMBER_NAME);
+    } else {
+        return todo!("handle other tokens: {:?}", p.current());
+    }
+
+    if !p.eat(SyntaxKind::COLON) {
+        todo!("handle wrong tokens")
+    }
+
+    let member_value_start = p.start("member_value_start");
+    if value(p) {
+        member_value_start.complete(p, SyntaxKind::MEMBER_VALUE);
+        Some(member_start.complete(p, SyntaxKind::MEMBER))
+    } else {
+        member_value_start.abandon(p);
+        let e = member_start.error(p, SyntaxError::MemberMissingValue);
+        Some(
+            e.precede(p, "member but failed already")
+                .complete(p, SyntaxKind::MEMBER),
+        )
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::grammar::{
+        object::{member, object},
+        test_utils::gen_checks,
+    };
+
+    #[test]
+    fn object_basic() {
+        gen_checks! {object;
+            r#"{"a": "b"}"#  => r#"ROOT { OBJECT { BRACE_OPEN "{"; MEMBER { MEMBER_NAME { STRING "\"a\""; } COLON ":"; WHITESPACE " "; MEMBER_VALUE { STRING "\"b\""; } } BRACE_CLOSE "}"; } }"#,
+            r#"{"a": 42}"#   => r#"ROOT { OBJECT { BRACE_OPEN "{"; MEMBER { MEMBER_NAME { STRING "\"a\""; } COLON ":"; WHITESPACE " "; MEMBER_VALUE { NUMBER "42"; } } BRACE_CLOSE "}"; } }"#,
+            r#"{"a": "b""#   => r#"ROOT { PARSE_ERR: UnclosedObject { BRACE_OPEN "{"; MEMBER { MEMBER_NAME { STRING "\"a\""; } COLON ":"; WHITESPACE " "; MEMBER_VALUE { STRING "\"b\""; } } } }"#,
+            r#"{"a": }"#     => r#"ROOT { OBJECT { BRACE_OPEN "{"; MEMBER { PARSE_ERR: MemberMissingValue { MEMBER_NAME { STRING "\"a\""; } COLON ":"; } } WHITESPACE " "; BRACE_CLOSE "}"; } }"#,
+            r#"{"a":"#       => r#"ROOT { PARSE_ERR: UnclosedObject { BRACE_OPEN "{"; MEMBER { PARSE_ERR: MemberMissingValue { MEMBER_NAME { STRING "\"a\""; } COLON ":"; } } } }"#,
+            r#"{"a":true,}"# => r#"ROOT { OBJECT { BRACE_OPEN "{"; MEMBER { MEMBER_NAME { STRING "\"a\""; } COLON ":"; MEMBER_VALUE { BOOL "true"; } } TRAILING_COMMA { COMMA ","; } BRACE_CLOSE "}"; } }"#
+        }
+    }
+
+    #[test]
+    fn member_basic() {
+        gen_checks! {member;
+            r#""a": "b""# => r#"ROOT { MEMBER { MEMBER_NAME { STRING "\"a\""; } COLON ":"; WHITESPACE " "; MEMBER_VALUE { STRING "\"b\""; } } }"#,
+            r#""a": 42"#  => r#"ROOT { MEMBER { MEMBER_NAME { STRING "\"a\""; } COLON ":"; WHITESPACE " "; MEMBER_VALUE { NUMBER "42"; } } }"#,
+            r#""a":"#     => r#"ROOT { MEMBER { PARSE_ERR: MemberMissingValue { MEMBER_NAME { STRING "\"a\""; } COLON ":"; } } }"#
+        }
+    }
+}

crates/json-pawarser/src/lib.rs

@@ -0,0 +1,3 @@
+mod grammar;
+mod syntax_error;
+mod syntax_kind;

crates/json-pawarser/src/syntax_error.rs

@@ -0,0 +1,11 @@
+use crate::syntax_kind::SyntaxKind;
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub enum SyntaxError {
+    UnclosedObject,
+    UnclosedArray,
+    DisallowedKeyType(SyntaxKind),
+    MemberMissingValue,
+    UnexpectedTrailingComma,
+}
+impl pawarser::parser::SyntaxError for SyntaxError {}

crates/json-pawarser/src/syntax_kind.rs

@@ -0,0 +1,117 @@
+use logos::Logos;
+
+pub fn lex(src: &str) -> Vec<(SyntaxKind, &str)> {
+    let mut lex = SyntaxKind::lexer(src);
+    let mut r = Vec::new();
+
+    while let Some(tok_res) = lex.next() {
+        r.push((tok_res.unwrap_or(SyntaxKind::LEX_ERR), lex.slice()))
+    }
+
+    r
+}
+
+#[derive(enumset::EnumSetType, Debug, Logos, PartialEq, Eq, Clone, Copy, Hash)]
+#[repr(u16)]
+#[enumset(no_super_impls)]
+#[allow(non_camel_case_types)]
+pub enum SyntaxKind {
+    OBJECT,
+    MEMBER,
+    MEMBER_NAME,
+    MEMBER_VALUE,
+
+    ARRAY,
+    ELEMENT,
+
+    // SyntaxKinds for future json5/etc support
+    TRAILING_COMMA,
+
+    // Tokens
+    // Regexes adapted from [the logos handbook](https://logos.maciej.codes/examples/json_borrowed.html)
+    #[token("true")]
+    #[token("false")]
+    BOOL,
+    #[token("{")]
+    BRACE_OPEN,
+    #[token("}")]
+    BRACE_CLOSE,
+    #[token("[")]
+    BRACKET_OPEN,
+    #[token("]")]
+    BRACKET_CLOSE,
+    #[token(":")]
+    COLON,
+    #[token(",")]
+    COMMA,
+    #[token("null")]
+    NULL,
+    #[regex(r"-?(?:0|[1-9]\d*)(?:\.\d+)?(?:[eE][+-]?\d+)?")]
+    NUMBER,
+    #[regex(r#""([^"\\]|\\["\\bnfrt]|u[a-fA-F0-9]{4})*""#)]
+    STRING,
+
+    // Whitespace tokens
+    #[regex("[ \\t\\f]+")]
+    WHITESPACE,
+    #[token("\n")]
+    NEWLINE,
+
+    // Error SyntaxKinds
+    LEX_ERR,
+    PARSE_ERR,
+
+    // Meta SyntaxKinds
+    ROOT,
+    EOF,
+}
+
+impl pawarser::parser::SyntaxElement for SyntaxKind {
+    const SYNTAX_EOF: Self = Self::EOF;
+
+    const SYNTAX_ERROR: Self = Self::PARSE_ERR;
+    const SYNTAX_ROOT: Self = Self::ROOT;
+}
+
+impl From<SyntaxKind> for rowan::SyntaxKind {
+    fn from(kind: SyntaxKind) -> Self {
+        Self(kind as u16)
+    }
+}
+
+impl From<rowan::SyntaxKind> for SyntaxKind {
+    fn from(raw: rowan::SyntaxKind) -> Self {
+        assert!(raw.0 <= SyntaxKind::EOF as u16);
+        #[allow(unsafe_code, reason = "The transmute is necessary here")]
+        unsafe {
+            std::mem::transmute::<u16, SyntaxKind>(raw.0)
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::syntax_kind::{lex, SyntaxKind};
+
+    #[test]
+    fn simple_object() {
+        const TEST_DATA: &str = r#"{"hello_world": "meow", "some_num":7.42}"#;
+
+        assert_eq!(
+            dbg!(lex(TEST_DATA)),
+            vec![
+                (SyntaxKind::BRACE_OPEN, "{"),
+                (SyntaxKind::STRING, "\"hello_world\""),
+                (SyntaxKind::COLON, ":"),
+                (SyntaxKind::WHITESPACE, " "),
+                (SyntaxKind::STRING, "\"meow\""),
+                (SyntaxKind::COMMA, ","),
+                (SyntaxKind::WHITESPACE, " "),
+                (SyntaxKind::STRING, "\"some_num\""),
+                (SyntaxKind::COLON, ":"),
+                (SyntaxKind::NUMBER, "7.42"),
+                (SyntaxKind::BRACE_CLOSE, "}")
+            ]
+        );
+    }
+}

crates/lang/Cargo.toml

@@ -0,0 +1,25 @@
+[package]
+name = "lang"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+logos = "0.14"
+petgraph = { workspace = true}
+indexmap = "2.2.6"
+clap = { version = "4", features = ["derive"] }
+ariadne = "0.4.0"
+ego-tree = "0.6.2"
+rowan = "0.15.15"
+drop_bomb = "0.1.5"
+enumset = "1.1.3"
+indoc = "2"
+dashmap = "5.5.3"
+crossbeam = "0.8.4"
+owo-colors = {version = "4", features = ["supports-colors"]}
+strip-ansi-escapes = "0.2.0"
+
+[lints]
+workspace = true

crates/lang/src/ast.rs

@@ -0,0 +1,80 @@
+use crate::lst_parser::syntax_kind::SyntaxKind::*;
+use crate::SyntaxNode;
+use rowan::Language;
+
+// Heavily modified version of https://github.com/rust-analyzer/rowan/blob/e2d2e93e16c5104b136d0bc738a0d48346922200/examples/s_expressions.rs#L250-L266
+macro_rules! ast_nodes {
+    ($($ast:ident, $kind:ident);+) => {
+        $(
+            #[derive(Debug, Clone, PartialEq, Eq, Hash)]
+            #[repr(transparent)]
+            pub struct $ast(SyntaxNode);
+            impl rowan::ast::AstNode for $ast {
+                type Language = crate::Lang;
+
+                fn can_cast(kind: <Self::Language as Language>::Kind) -> bool {
+                    kind == $kind
+                }
+
+                fn cast(node: SyntaxNode) -> Option<Self> {
+                    if node.kind() == $kind {
+                        Some(Self(node))
+                    } else {
+                        None
+                    }
+                }
+
+                fn syntax(&self) -> &SyntaxNode {
+                    &self.0
+                }
+            }
+        )+
+    };
+}
+
+ast_nodes!(
+    Def, DEF;
+    DefName, DEF_NAME;
+    DefBody, DEF_BODY;
+
+    Mod, MODULE;
+    ModName, MODULE_NAME;
+    ModBody, MODULE_BODY;
+
+    Use, USE;
+    UsePat, USE_PAT;
+    PatItem, PAT_ITEM;
+    PatGlob, PAT_GLOB;
+    PatGroup, PAT_GROUP;
+
+    Literal, LITERAL;
+    IntLit, INT_NUM;
+    FloatLit, FLOAT_NUM;
+    StringLit, STRING;
+
+    Matrix, MATRIX;
+    MatrixRow, MAT_ROW;
+    Vector, VEC;
+    List, LIST;
+    CollectionItem, COLLECTION_ITEM;
+
+    ParenthesizedExpr, PARENTHESIZED_EXPR;
+    Expression, EXPR;
+
+    Pipeline, PIPELINE;
+
+    Instruction, INSTR;
+    InstructionName, INSTR_NAME;
+    InstructionParams, INSTR_PARAMS;
+
+    AttributeSet, ATTR_SET;
+    Attribute, ATTR;
+    AttributeName, ATTR_NAME;
+    AttributeValue, ATTR_VALUE;
+
+    ParseError, PARSE_ERR;
+    LexError, LEX_ERR;
+
+    Root, ROOT;
+    Eof, EOF
+);

crates/lang/src/lib.rs

@@ -0,0 +1,25 @@
+#![feature(type_alias_impl_trait, lint_reasons, box_into_inner)]
+
+use crate::lst_parser::syntax_kind::SyntaxKind;
+
+pub mod ast;
+pub mod lst_parser;
+pub mod world;
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub enum Lang {}
+impl rowan::Language for Lang {
+    type Kind = SyntaxKind;
+    #[allow(unsafe_code)]
+    fn kind_from_raw(raw: rowan::SyntaxKind) -> Self::Kind {
+        assert!(raw.0 <= SyntaxKind::ROOT as u16);
+        unsafe { std::mem::transmute::<u16, SyntaxKind>(raw.0) }
+    }
+    fn kind_to_raw(kind: Self::Kind) -> rowan::SyntaxKind {
+        kind.into()
+    }
+}
+
+pub type SyntaxNode = rowan::SyntaxNode<Lang>;
+pub type SyntaxToken = rowan::SyntaxNode<Lang>;
+pub type SyntaxElement = rowan::NodeOrToken<SyntaxNode, SyntaxToken>;

crates/lang/src/lst_parser.rs

@@ -0,0 +1,169 @@
+use drop_bomb::DropBomb;
+
+use self::{
+    error::SyntaxError,
+    events::{Event, NodeKind},
+    input::Input,
+    syntax_kind::SyntaxKind,
+};
+use std::cell::Cell;
+
+pub mod syntax_kind;
+#[cfg(test)]
+mod tests;
+
+pub mod error;
+pub mod events;
+pub mod grammar;
+pub mod input;
+pub mod output;
+
+const PARSER_STEP_LIMIT: u32 = 4096;
+
+pub struct Parser<'src, 'toks> {
+    input: Input<'src, 'toks>,
+    pos: usize,
+    events: Vec<Event>,
+    steps: Cell<u32>,
+}
+
+impl<'src, 'toks> Parser<'src, 'toks> {
+    pub fn new(input: Input<'src, 'toks>) -> Self {
+        Self {
+            input,
+            pos: 0,
+            events: Vec::new(),
+            steps: Cell::new(0),
+        }
+    }
+
+    pub fn finish(self) -> Vec<Event> {
+        self.events
+    }
+
+    pub(crate) fn nth(&self, n: usize) -> SyntaxKind {
+        self.step();
+        self.input.kind(self.pos + n)
+    }
+
+    pub fn eat_succeeding_ws(&mut self) {
+        self.push_ev(Event::Eat {
+            count: self.input.meaningless_tail_len(),
+        });
+    }
+
+    pub(crate) fn current(&self) -> SyntaxKind {
+        self.step();
+        self.input.kind(self.pos)
+    }
+
+    pub(crate) fn start(&mut self, name: &str) -> Marker {
+        let pos = self.events.len();
+        self.push_ev(Event::tombstone());
+        Marker::new(pos, name)
+    }
+
+    pub(crate) fn at(&self, kind: SyntaxKind) -> bool {
+        self.nth_at(0, kind)
+    }
+
+    pub(crate) fn eat(&mut self, kind: SyntaxKind) -> bool {
+        if !self.at(kind) {
+            return false;
+        }
+
+        self.do_bump();
+        true
+    }
+
+    pub(crate) fn nth_at(&self, n: usize, kind: SyntaxKind) -> bool {
+        self.nth(n) == kind
+    }
+
+    fn do_bump(&mut self) {
+        self.push_ev(Event::Eat {
+            count: self.input.preceding_meaningless(self.pos),
+        });
+        self.pos += 1;
+    }
+
+    fn push_ev(&mut self, event: Event) {
+        self.events.push(event)
+    }
+
+    fn step(&self) {
+        let steps = self.steps.get();
+        assert!(steps <= PARSER_STEP_LIMIT, "the parser seems stuck...");
+        self.steps.set(steps + 1);
+    }
+}
+
+pub(crate) struct Marker {
+    pos: usize,
+    bomb: DropBomb,
+}
+
+impl Marker {
+    pub(crate) fn new(pos: usize, name: &str) -> Self {
+        Self {
+            pos,
+            bomb: DropBomb::new(format!("Marker {name} must be completed or abandoned")),
+        }
+    }
+
+    fn close_node(mut self, p: &mut Parser, kind: NodeKind) -> CompletedMarker {
+        self.bomb.defuse();
+        match &mut p.events[self.pos] {
+            Event::Start { kind: slot, .. } => *slot = kind.clone(),
+            _ => unreachable!(),
+        }
+
+        p.push_ev(Event::Finish);
+
+        CompletedMarker {
+            pos: self.pos,
+            kind,
+        }
+    }
+
+    pub(crate) fn complete(self, p: &mut Parser<'_, '_>, kind: SyntaxKind) -> CompletedMarker {
+        self.close_node(p, NodeKind::Syntax(kind))
+    }
+
+    pub(crate) fn error(self, p: &mut Parser, kind: SyntaxError) -> CompletedMarker {
+        self.close_node(p, NodeKind::Error(kind))
+    }
+
+    pub(crate) fn abandon(mut self, p: &mut Parser<'_, '_>) {
+        self.bomb.defuse();
+        if self.pos == p.events.len() - 1 {
+            match p.events.pop() {
+                Some(Event::Start {
+                    kind: NodeKind::Syntax(SyntaxKind::TOMBSTONE),
+                    forward_parent: None,
+                }) => (),
+                _ => unreachable!(),
+            }
+        }
+    }
+}
+
+pub(crate) struct CompletedMarker {
+    pos: usize,
+    kind: NodeKind,
+}
+
+impl CompletedMarker {
+    pub(crate) fn precede(self, p: &mut Parser<'_, '_>, name: &str) -> Marker {
+        let new_pos = p.start(name);
+
+        match &mut p.events[self.pos] {
+            Event::Start { forward_parent, .. } => {
+                *forward_parent = Some(new_pos.pos - self.pos);
+            }
+            _ => unreachable!(),
+        }
+
+        new_pos
+    }
+}

crates/lang/src/lst_parser/error.rs

@@ -0,0 +1,15 @@
+use crate::lst_parser::syntax_kind::SyntaxKind;
+
+#[derive(Debug, PartialEq, Eq, Clone)]
+pub enum SyntaxError {
+    Expected(Vec<SyntaxKind>),
+    PipelineNeedsSink,
+    // if there was two space seperated items in a list
+    SpaceSepInList,
+    SemicolonInList,
+    CommaInMatOrVec,
+    UnterminatedTopLevelItem,
+    UnclosedModuleBody,
+    UnfinishedPath,
+    PathSepContainsSemicolon,
+}

crates/lang/src/lst_parser/events.rs

@@ -0,0 +1,70 @@
+use crate::lst_parser::syntax_kind::SyntaxKind;
+
+use super::error::SyntaxError;
+
+#[derive(Debug)]
+pub enum Event {
+    Start {
+        kind: NodeKind,
+        forward_parent: Option<usize>,
+    },
+    Finish,
+    Eat {
+        count: usize,
+    },
+}
+
+#[derive(Debug, Clone, PartialEq)]
+pub enum NodeKind {
+    Syntax(SyntaxKind),
+    Error(SyntaxError),
+}
+
+impl NodeKind {
+    pub fn is_syntax(&self) -> bool {
+        matches!(self, Self::Syntax(_))
+    }
+
+    pub fn is_error(&self) -> bool {
+        matches!(self, Self::Error(_))
+    }
+}
+
+impl From<SyntaxKind> for NodeKind {
+    fn from(value: SyntaxKind) -> Self {
+        NodeKind::Syntax(value)
+    }
+}
+
+impl From<SyntaxError> for NodeKind {
+    fn from(value: SyntaxError) -> Self {
+        NodeKind::Error(value)
+    }
+}
+
+impl PartialEq<SyntaxKind> for NodeKind {
+    fn eq(&self, other: &SyntaxKind) -> bool {
+        match self {
+            NodeKind::Syntax(s) => s == other,
+            NodeKind::Error(_) => false,
+        }
+    }
+}
+
+impl PartialEq<SyntaxError> for NodeKind {
+    fn eq(&self, other: &SyntaxError) -> bool {
+        match self {
+            NodeKind::Syntax(_) => false,
+            NodeKind::Error(e) => e == other,
+        }
+    }
+}
+
+impl Event {
+    pub(crate) fn tombstone() -> Self {
+        Self::Start {
+            kind: SyntaxKind::TOMBSTONE.into(),
+            forward_parent: None,
+        }
+    }
+}

crates/lang/src/lst_parser/grammar.rs

@@ -0,0 +1,38 @@
+use std::fmt::Debug;
+
+use crate::lst_parser::syntax_kind::SyntaxKind::*;
+
+use self::module::{mod_body, top_level_item};
+
+use super::{
+    input::Input,
+    output::Output,
+    syntax_kind::{self, lex},
+    Parser,
+};
+
+mod expression;
+mod module;
+
+pub fn source_file(p: &mut Parser) {
+    let root = p.start("root");
+
+    mod_body(p);
+    // expression::expression(p, false);
+    p.eat_succeeding_ws();
+
+    root.complete(p, ROOT);
+}
+
+fn check_parser(input: &str, parser_fn: fn(&mut Parser), output: &str) {
+    let toks = lex(input);
+    let mut parser = Parser::new(Input::new(&toks));
+
+    parser_fn(&mut parser);
+
+    let p_out = dbg!(parser.finish());
+    let o = Output::from_parser_output(toks, p_out);
+
+    let s = strip_ansi_escapes::strip_str(format!("{o:?}"));
+    assert_eq!(&s, output);
+}

crates/lang/src/lst_parser/grammar/expression.rs

@@ -0,0 +1,44 @@
+use crate::lst_parser::{error::SyntaxError, syntax_kind::SyntaxKind::*, CompletedMarker, Parser};
+
+use self::{collection::collection, instruction::instr, lit::literal, pipeline::PIPES};
+
+mod collection;
+mod instruction;
+mod lit;
+mod pipeline;
+
+pub fn expression(p: &mut Parser, in_pipe: bool) -> Option<CompletedMarker> {
+    let expr = p.start("expr");
+
+    if atom(p).or_else(|| instr(p)).is_none() {
+        expr.abandon(p);
+        return None;
+    }
+
+    let r = expr.complete(p, EXPR);
+
+    if PIPES.contains(p.current()) && !in_pipe {
+        pipeline::pipeline(p, r)
+    } else {
+        Some(r)
+    }
+}
+
+pub fn atom(p: &mut Parser) -> Option<CompletedMarker> {
+    literal(p)
+        .or_else(|| collection(p))
+        .or_else(|| parenthesized_expr(p))
+}
+
+pub fn parenthesized_expr(p: &mut Parser) -> Option<CompletedMarker> {
+    if p.eat(L_PAREN) {
+        let par_expr = p.start("parenthesized");
+        expression(p, false);
+        if !p.eat(R_PAREN) {
+            return Some(par_expr.error(p, SyntaxError::Expected(vec![R_PAREN])));
+        }
+
+        return Some(par_expr.complete(p, PARENTHESIZED_EXPR));
+    }
+    None
+}

crates/lang/src/lst_parser/grammar/expression/collection.rs

@@ -0,0 +1,25 @@
+use enumset::enum_set;
+
+use crate::lst_parser::{
+    syntax_kind::{SyntaxKind::*, TokenSet},
+    CompletedMarker, Parser,
+};
+
+use self::{attr_set::attr_set, vec::vec_matrix_list};
+
+mod attr_set;
+mod vec;
+
+const COLLECTION_START: TokenSet = enum_set!(L_BRACK | L_BRACE);
+
+pub fn collection(p: &mut Parser) -> Option<CompletedMarker> {
+    if !COLLECTION_START.contains(p.current()) {
+        return None;
+    }
+
+    Some(match p.current() {
+        L_BRACK => vec_matrix_list(p),
+        L_BRACE => attr_set(p),
+        _ => unreachable!(),
+    })
+}

crates/lang/src/lst_parser/grammar/expression/collection/attr_set.rs

@@ -0,0 +1,45 @@
+use crate::lst_parser::{
+    error::SyntaxError,
+    grammar::expression::{atom, expression},
+    CompletedMarker, Marker, Parser,
+    SyntaxKind::*,
+};
+
+pub fn attr_set(p: &mut Parser) -> CompletedMarker {
+    let start = p.start("attr_set_start");
+    assert!(p.eat(L_BRACE));
+
+    loop {
+        if attr(p).is_some() {
+            // TODO: handle others
+            if p.eat(COMMA) {
+                continue;
+            } else if p.eat(R_BRACE) {
+                return start.complete(p, ATTR_SET);
+            }
+            // TODO: check for newline  and stuff following that for recov of others
+        } else if p.eat(R_BRACE) {
+            return start.complete(p, ATTR_SET);
+        }
+    }
+}
+
+fn attr(p: &mut Parser) -> Option<CompletedMarker> {
+    if p.at(IDENT) {
+        let attr_start = p.start("attr");
+        let attr_name_start = p.start("attr_name");
+        p.do_bump();
+        attr_name_start.complete(p, ATTR_NAME);
+
+        // TODO: handle comma, expr/atom, other
+        p.eat(COLON);
+
+        // TODO: handle failed expr parser too
+        let attr_value = p.start("attr_value");
+        let _ = expression(p, false);
+        attr_value.complete(p, ATTR_VALUE);
+        Some(attr_start.complete(p, ATTR))
+    } else {
+        None
+    }
+}

crates/lang/src/lst_parser/grammar/expression/collection/vec.rs

@@ -0,0 +1,97 @@
+use crate::lst_parser::{
+    error::SyntaxError, grammar::expression::atom, CompletedMarker, Marker, Parser, SyntaxKind::*,
+};
+
+pub fn vec_matrix_list(p: &mut Parser) -> CompletedMarker {
+    let start = p.start("vec_matrix_list_start");
+    assert!(p.eat(L_BRACK));
+    let row_start = p.start("matrix_row_start");
+    if let Some(item) = atom(p) {
+        item.precede(p, "coll_item_start")
+            .complete(p, COLLECTION_ITEM);
+
+        if p.at(COMMA) {
+            row_start.abandon(p);
+            return finish_list(p, start);
+        }
+
+        finish_mat_or_vec(p, start, row_start)
+    } else if p.eat(R_BRACK) {
+        row_start.abandon(p);
+        start.complete(p, LIST)
+    } else {
+        row_start.abandon(p);
+        start.error(p, SyntaxError::Expected(vec![EXPR, R_BRACK]))
+    }
+}
+
+fn finish_list(p: &mut Parser, list_start: Marker) -> CompletedMarker {
+    loop {
+        if p.eat(COMMA) {
+            if let Some(item) = atom(p) {
+                item.precede(p, "coll_item_start")
+                    .complete(p, COLLECTION_ITEM);
+            } else if p.eat(R_BRACK) {
+                return list_start.complete(p, LIST);
+            }
+        } else if p.eat(R_BRACK) {
+            return list_start.complete(p, LIST);
+        } else if let Some(item) = atom(p) {
+            item.precede(p, "next_item")
+                .complete(p, COLLECTION_ITEM)
+                .precede(p, "err_space_sep")
+                .error(p, SyntaxError::SpaceSepInList);
+        } else if p.at(SEMICOLON) {
+            let semi_err = p.start("semicolon_err");
+            p.eat(SEMICOLON);
+            semi_err.error(p, SyntaxError::SemicolonInList);
+            if let Some(item) = atom(p) {
+                item.precede(p, "coll_item_start")
+                    .complete(p, COLLECTION_ITEM);
+            } else if p.eat(R_BRACK) {
+                return list_start.complete(p, LIST);
+            }
+        }
+    }
+}
+
+// TODO: handle commas, general other wrong toks
+fn finish_mat_or_vec(p: &mut Parser, coll_start: Marker, mut row_start: Marker) -> CompletedMarker {
+    let mut is_matrix = false;
+    let mut row_item_count = 1;
+    loop {
+        if let Some(item) = atom(p) {
+            item.precede(p, "coll_item_start")
+                .complete(p, COLLECTION_ITEM);
+            row_item_count += 1;
+        } else if p.at(SEMICOLON) {
+            is_matrix = true;
+            row_start.complete(p, MAT_ROW);
+            p.eat(SEMICOLON);
+            row_start = p.start("matrix_row_start");
+            row_item_count = 0;
+        } else if p.at(R_BRACK) {
+            if is_matrix && row_item_count == 0 {
+                row_start.abandon(p);
+                p.eat(R_BRACK);
+                return coll_start.complete(p, MATRIX);
+            } else if is_matrix {
+                row_start.complete(p, MAT_ROW);
+                p.eat(R_BRACK);
+                return coll_start.complete(p, MATRIX);
+            } else {
+                row_start.abandon(p);
+                p.eat(R_BRACK);
+                return coll_start.complete(p, VEC);
+            }
+        } else if p.at(COMMA) {
+            let err_unexpected_comma = p.start("err_unexpected_comma");
+            p.do_bump();
+            err_unexpected_comma.error(p, SyntaxError::CommaInMatOrVec);
+        } else {
+            let err_unexpected = p.start("err_unexpected_tok");
+            p.do_bump();
+            err_unexpected.error(p, SyntaxError::Expected(vec![EXPR, SEMICOLON, R_BRACK]));
+        }
+    }
+}

crates/lang/src/lst_parser/grammar/expression/instruction.rs

@@ -0,0 +1,34 @@
+use crate::lst_parser::{syntax_kind::SyntaxKind::*, CompletedMarker, Parser};
+
+use super::{atom, lit::literal};
+
+pub fn instr(p: &mut Parser) -> Option<CompletedMarker> {
+    if !p.at(IDENT) {
+        return None;
+    }
+
+    let instr = p.start("instr");
+
+    instr_name(p);
+    instr_params(p);
+
+    Some(instr.complete(p, INSTR))
+}
+
+fn instr_name(p: &mut Parser) {
+    let instr_name = p.start("instr_name");
+
+    while p.at(IDENT) {
+        p.do_bump();
+    }
+
+    instr_name.complete(p, INSTR_NAME);
+}
+
+fn instr_params(p: &mut Parser) {
+    if let Some(start) = atom(p) {
+        while atom(p).is_some() {}
+
+        start.precede(p, "params_start").complete(p, INSTR_PARAMS);
+    }
+}

crates/lang/src/lst_parser/grammar/expression/lit.rs

@@ -0,0 +1,59 @@
+use enumset::enum_set;
+use indoc::indoc;
+
+use crate::lst_parser::{
+    grammar::check_parser,
+    syntax_kind::{SyntaxKind::*, TokenSet},
+    CompletedMarker, Parser,
+};
+
+const LIT_TOKENS: TokenSet = enum_set!(INT_NUM | FLOAT_NUM | STRING);
+
+pub fn literal(p: &mut Parser) -> Option<CompletedMarker> {
+    if !LIT_TOKENS.contains(p.current()) {
+        return None;
+    }
+
+    let lit = p.start("lit");
+
+    p.do_bump();
+
+    Some(lit.complete(p, LITERAL))
+}
+
+#[test]
+fn test_parse_lst_lit() {
+    check_parser(
+        "42",
+        |p| {
+            literal(p);
+        },
+        indoc! {r#"
+            LITERAL {
+                INT_NUM "42";
+            }
+        "#},
+    );
+    check_parser(
+        "3.14",
+        |p| {
+            literal(p);
+        },
+        indoc! {r#"
+            LITERAL {
+                FLOAT_NUM "3.14";
+            }
+        "#},
+    );
+    check_parser(
+        r#""Meow""#,
+        |p| {
+            literal(p);
+        },
+        indoc! {r#"
+            LITERAL {
+                STRING "\"Meow\"";
+            }
+        "#},
+    );
+}

crates/lang/src/lst_parser/grammar/expression/pipeline.rs

@@ -0,0 +1,36 @@
+use enumset::enum_set;
+
+use crate::lst_parser::{
+    error::SyntaxError,
+    syntax_kind::{SyntaxKind::*, TokenSet},
+    CompletedMarker, Parser,
+};
+
+use super::expression;
+
+pub fn pipeline(p: &mut Parser, start_expr: CompletedMarker) -> Option<CompletedMarker> {
+    if !pipe(p) {
+        return Some(start_expr);
+    }
+    let pipeline_marker = start_expr.precede(p, "pipeline_start");
+
+    loop {
+        if expression(p, true).is_none() {
+            return Some(pipeline_marker.error(p, SyntaxError::PipelineNeedsSink));
+        }
+        if !pipe(p) {
+            return Some(pipeline_marker.complete(p, PIPELINE));
+        }
+    }
+}
+
+pub const PIPES: TokenSet = enum_set!(PIPE | MAPPING_PIPE | NULL_PIPE);
+
+fn pipe(p: &mut Parser) -> bool {
+    if PIPES.contains(p.current()) {
+        p.do_bump();
+        true
+    } else {
+        false
+    }
+}

crates/lang/src/lst_parser/grammar/module.rs

@@ -0,0 +1,191 @@
+use enumset::enum_set;
+
+use crate::lst_parser::{
+    error::SyntaxError,
+    grammar::expression::expression,
+    syntax_kind::{SyntaxKind::*, TokenSet},
+    CompletedMarker, Parser,
+};
+
+const TOP_LEVEL_ITEM_START: TokenSet = enum_set!(DEF_KW | MOD_KW | USE_KW);
+
+pub fn mod_body(p: &mut Parser) {
+    loop {
+        if top_level_item(p).is_none() {
+            break;
+        }
+    }
+}
+
+fn mod_decl(p: &mut Parser) -> Option<CompletedMarker> {
+    let mod_start = p.start("module");
+    if !p.eat(MOD_KW) {
+        mod_start.abandon(p);
+        return None;
+    }
+
+    let mod_name = p.start("module_name");
+    if p.eat(IDENT) {
+        mod_name.complete(p, MODULE_NAME);
+    } else {
+        mod_name.error(p, SyntaxError::Expected(vec![IDENT]));
+    }
+
+    let mod_body_marker = p.start("mod_body");
+    if p.eat(SEMICOLON) {
+        mod_body_marker.abandon(p);
+        Some(mod_start.complete(p, MODULE))
+    } else if p.eat(L_BRACE) {
+        mod_body(p);
+        if !p.eat(R_BRACE) {
+            mod_body_marker
+                .complete(p, MODULE_BODY)
+                .precede(p, "unclosed_mod_body_err")
+                .error(p, SyntaxError::UnclosedModuleBody);
+        } else {
+            mod_body_marker.complete(p, MODULE_BODY);
+        }
+        Some(mod_start.complete(p, MODULE))
+    } else {
+        Some(mod_start.error(p, SyntaxError::Expected(vec![MODULE_BODY])))
+    }
+}
+
+pub fn top_level_item(p: &mut Parser) -> Option<CompletedMarker> {
+    if !TOP_LEVEL_ITEM_START.contains(p.current()) {
+        return None;
+    }
+    def(p).or_else(|| mod_decl(p)).or_else(|| r#use(p))
+}
+
+fn def(p: &mut Parser) -> Option<CompletedMarker> {
+    let def_start = p.start("top_level_def");
+    if !p.eat(DEF_KW) {
+        def_start.abandon(p);
+        return None;
+    }
+
+    let def_name = p.start("def_name");
+    if p.eat(IDENT) {
+        def_name.complete(p, DEF_NAME);
+    } else {
+        def_name.error(p, SyntaxError::Expected(vec![IDENT]));
+    }
+
+    let maybe_expected_eq = p.start("maybe_expect_eq");
+    if !p.eat(EQ) {
+        maybe_expected_eq.error(p, SyntaxError::Expected(vec![EQ]));
+    } else {
+        maybe_expected_eq.abandon(p);
+    }
+
+    let body = p.start("def_body");
+    if expression(p, false).is_some() {
+        body.complete(p, DEF_BODY);
+    } else {
+        body.error(p, SyntaxError::Expected(vec![DEF_BODY]));
+    }
+
+    Some(if p.eat(SEMICOLON) {
+        def_start.complete(p, DEF)
+    } else if TOP_LEVEL_ITEM_START.contains(p.current()) || p.at(EOF) {
+        def_start
+            .complete(p, DEF)
+            .precede(p, "unterminated_tl_item")
+            .error(p, SyntaxError::UnterminatedTopLevelItem)
+    } else {
+        def_start
+            .complete(p, DEF)
+            .precede(p, "err_unexpected")
+            .error(p, SyntaxError::Expected(vec![SEMICOLON]))
+    })
+}
+
+fn r#use(p: &mut Parser) -> Option<CompletedMarker> {
+    let use_start = p.start("use_start");
+    if !p.eat(USE_KW) {
+        use_start.abandon(p);
+        return None;
+    }
+
+    if use_pat(p).is_none() {
+        p.start("expected_use_pat")
+            .error(p, SyntaxError::Expected(vec![USE_PAT]));
+    }
+
+    let use_item = use_start.complete(p, USE);
+    Some(if p.eat(SEMICOLON) {
+        use_item
+    } else if TOP_LEVEL_ITEM_START.contains(p.current()) || p.at(EOF) {
+        use_item
+            .precede(p, "unterminated_tl_item")
+            .error(p, SyntaxError::UnterminatedTopLevelItem)
+    } else {
+        use_item
+            .precede(p, "err_unexpected")
+            .error(p, SyntaxError::Expected(vec![SEMICOLON]))
+    })
+}
+
+fn use_pat(p: &mut Parser) -> Option<CompletedMarker> {
+    let use_pat_marker = p.start("use_pat");
+    if !p.eat(IDENT) {
+        return None;
+    }
+
+    loop {
+        if p.eat(PATH_SEP) {
+            if pat_item(p).is_none() {
+                break Some(use_pat_marker.error(p, SyntaxError::UnfinishedPath));
+            }
+        } else if p.at(SEMICOLON) && p.nth_at(1, COLON) {
+            let broken_sep = p.start("broken_path_sep");
+            let wrong_semi = p.start("semi_typo");
+            p.eat(SEMICOLON);
+            wrong_semi.error(p, SyntaxError::PathSepContainsSemicolon);
+            p.eat(COLON);
+            broken_sep.complete(p, PATH_SEP);
+            if pat_item(p).is_none() {
+                break Some(use_pat_marker.error(p, SyntaxError::UnfinishedPath));
+            }
+        } else if p.at(COLON) && p.nth_at(1, SEMICOLON) {
+            let broken_sep = p.start("broken_path_sep");
+            p.eat(COLON);
+            let wrong_semi = p.start("semi_typo");
+            p.eat(SEMICOLON);
+            wrong_semi.error(p, SyntaxError::PathSepContainsSemicolon);
+            broken_sep.complete(p, PATH_SEP);
+            if pat_item(p).is_none() {
+                break Some(use_pat_marker.error(p, SyntaxError::UnfinishedPath));
+            }
+        } else if p.at(SEMICOLON) && p.nth_at(1, SEMICOLON) {
+            let broken_sep = p.start("broken_path_sep");
+            p.eat(SEMICOLON);
+            p.eat(SEMICOLON);
+            broken_sep
+                .complete(p, PATH_SEP)
+                .precede(p, "semi_typo_err")
+                .error(p, SyntaxError::PathSepContainsSemicolon);
+            if pat_item(p).is_none() {
+                break Some(use_pat_marker.error(p, SyntaxError::UnfinishedPath));
+            }
+        } else if p.eat(SEMICOLON) {
+            break Some(use_pat_marker.complete(p, USE_PAT));
+        } else {
+            break Some(use_pat_marker.error(p, SyntaxError::Expected(vec![PATH_SEP, SEMICOLON])));
+        }
+    }
+}
+
+fn pat_item(p: &mut Parser) -> Option<CompletedMarker> {
+    let item_start = p.start("pat_item_start");
+    if p.eat(IDENT) {
+        Some(item_start.complete(p, PAT_ITEM))
+    } else if p.eat(STAR) {
+        Some(item_start.complete(p, PAT_GLOB))
+    } else if p.eat(L_BRACE) {
+        todo!("write PAT_GROUPs")
+    } else {
+        None
+    }
+}

crates/lang/src/lst_parser/input.rs

@@ -0,0 +1,70 @@
+use enumset::enum_set;
+
+use crate::lst_parser::syntax_kind::SyntaxKind;
+
+use super::syntax_kind::TokenSet;
+
+pub struct Input<'src, 'toks> {
+    raw: &'toks Vec<(SyntaxKind, &'src str)>,
+    /// indices of the "meaningful" tokens (not whitespace etc)
+    /// includes newlines because those might indeed help with finding errors
+    meaningful: Vec<usize>,
+    /// indices of newlines for the purpose of easily querying them
+    /// can be helpful with missing commas etc
+    newlines: Vec<usize>,
+}
+
+pub const MEANINGLESS_TOKS: TokenSet = enum_set!(SyntaxKind::WHITESPACE | SyntaxKind::NEWLINE);
+
+impl<'src, 'toks> Input<'src, 'toks> {
+    pub fn new(raw_toks: &'toks Vec<(SyntaxKind, &'src str)>) -> Self {
+        let meaningful = raw_toks
+            .iter()
+            .enumerate()
+            .filter_map(|(i, tok)| {
+                if MEANINGLESS_TOKS.contains(tok.0) {
+                    None
+                } else {
+                    Some(i)
+                }
+            })
+            .collect();
+        let newlines = raw_toks
+            .iter()
+            .enumerate()
+            .filter_map(|(i, tok)| match tok.0 {
+                SyntaxKind::NEWLINE => Some(i),
+                _ => None,
+            })
+            .collect();
+
+        Self {
+            raw: raw_toks,
+            meaningful,
+            newlines,
+        }
+    }
+
+    #[allow(clippy::unwrap_used, reason = "meaningful indices cannot be invalid")]
+    pub(crate) fn kind(&self, idx: usize) -> SyntaxKind {
+        let Some(meaningful_idx) = self.meaningful.get(idx) else {
+            return SyntaxKind::EOF;
+        };
+
+        self.raw.get(*meaningful_idx).unwrap().0
+    }
+
+    pub(crate) fn preceding_meaningless(&self, idx: usize) -> usize {
+        assert!(self.meaningful.len() > idx);
+
+        if idx == 0 {
+            1
+        } else {
+            self.meaningful[idx] - self.meaningful[idx - 1]
+        }
+    }
+
+    pub(crate) fn meaningless_tail_len(&self) -> usize {
+        self.raw.len() - (self.meaningful.last().unwrap() + 1)
+    }
+}

crates/lang/src/lst_parser/output.rs

@@ -0,0 +1,208 @@
+use clap::builder;
+use owo_colors::{unset_override, OwoColorize};
+use rowan::{GreenNode, GreenNodeBuilder, GreenNodeData, GreenTokenData, Language, NodeOrToken};
+use std::mem;
+
+use crate::{
+    lst_parser::{input::MEANINGLESS_TOKS, syntax_kind::SyntaxKind},
+    Lang, SyntaxNode,
+};
+
+use super::{
+    error::SyntaxError,
+    events::{Event, NodeKind},
+};
+
+pub struct Output {
+    pub green_node: GreenNode,
+    pub errors: Vec<SyntaxError>,
+}
+
+impl std::fmt::Debug for Output {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        let mut errs: Vec<&SyntaxError> = self.errors.iter().collect();
+        errs.reverse();
+
+        debug_print_green_node(NodeOrToken::Node(&self.green_node), f, 0, &mut errs, false)
+    }
+}
+
+const INDENT_STR: &str = "    ";
+/// colored argument currently broken
+fn debug_print_green_node(
+    node: NodeOrToken<&GreenNodeData, &GreenTokenData>,
+    f: &mut dyn std::fmt::Write,
+    lvl: i32,
+    errs: &mut Vec<&SyntaxError>,
+    colored: bool,
+) -> std::fmt::Result {
+    for _ in 0..lvl {
+        f.write_str(INDENT_STR)?;
+    }
+
+    let r = match node {
+        NodeOrToken::Node(n) => {
+            let kind = Lang::kind_from_raw(node.kind());
+            if kind != SyntaxKind::PARSE_ERR {
+                writeln!(
+                    f,
+                    "{:?} {}",
+                    Lang::kind_from_raw(node.kind()).bright_yellow().bold(),
+                    "{".yellow()
+                )?;
+            } else {
+                let err = errs
+                    .pop()
+                    .expect("all error syntax nodes should correspond to an error")
+                    .bright_red();
+
+                writeln!(
+                    f,
+                    "{:?}{} {err:?} {}",
+                    kind.bright_red().bold(),
+                    ":".red(),
+                    "{".bright_red().bold()
+                )?;
+            }
+            for c in n.children() {
+                debug_print_green_node(c, f, lvl + 1, errs, colored)?;
+            }
+            for _ in 0..lvl {
+                f.write_str(INDENT_STR)?;
+            }
+            if kind != SyntaxKind::PARSE_ERR {
+                write!(f, "{}", "}\n".yellow())
+            } else {
+                write!(f, "{}", "}\n".bright_red().bold())
+            }
+        }
+        NodeOrToken::Token(t) => {
+            let tok = Lang::kind_from_raw(t.kind());
+            if MEANINGLESS_TOKS.contains(tok) {
+                writeln!(
+                    f,
+                    "{:?} {:?}{}",
+                    Lang::kind_from_raw(t.kind()).white(),
+                    t.text().white(),
+                    ";".white()
+                )
+            } else {
+                writeln!(
+                    f,
+                    "{:?} {:?}{}",
+                    Lang::kind_from_raw(t.kind()).bright_cyan().bold(),
+                    t.text().green(),
+                    ";".yellow()
+                )
+            }
+        }
+    };
+
+    r
+}
+
+impl Output {
+    pub fn debug_colored(&self) -> String {
+        let mut out = String::new();
+        let mut errs: Vec<&SyntaxError> = self.errors.iter().collect();
+        errs.reverse();
+
+        let _ = debug_print_green_node(
+            NodeOrToken::Node(&self.green_node),
+            &mut out,
+            0,
+            &mut errs,
+            true,
+        );
+
+        out
+    }
+    pub fn from_parser_output(
+        mut raw_toks: Vec<(SyntaxKind, &str)>,
+        mut events: Vec<Event>,
+    ) -> Self {
+        let mut builder = GreenNodeBuilder::new();
+        let mut fw_parents = Vec::new();
+        let mut errors = Vec::new();
+        raw_toks.reverse();
+
+        for i in 0..events.len() {
+            match mem::replace(&mut events[i], Event::tombstone()) {
+                Event::Start {
+                    kind,
+                    forward_parent,
+                } => {
+                    if kind == SyntaxKind::TOMBSTONE && forward_parent.is_none() {
+                        continue;
+                    }
+
+                    fw_parents.push(kind);
+                    let mut idx = i;
+                    let mut fp = forward_parent;
+                    while let Some(fwd) = fp {
+                        idx += fwd as usize;
+                        fp = match mem::replace(&mut events[idx], Event::tombstone()) {
+                            Event::Start {
+                                kind,
+                                forward_parent,
+                            } => {
+                                fw_parents.push(kind);
+                                forward_parent
+                            }
+                            _ => unreachable!(),
+                        }
+                    }
+
+                    // remove whitespace bc it's ugly
+                    while let Some((SyntaxKind::WHITESPACE | SyntaxKind::NEWLINE, _)) =
+                        raw_toks.last()
+                    {
+                        match events.iter_mut().find(|ev| matches!(ev, Event::Eat { .. })) {
+                            Some(Event::Eat { count }) => *count -= 1,
+                            _ => unreachable!(),
+                        }
+
+                        let (tok, text): (SyntaxKind, &str) = raw_toks.pop().unwrap();
+                        builder.token(tok.into(), text);
+                    }
+
+                    for kind in fw_parents.drain(..).rev() {
+                        match kind {
+                            NodeKind::Syntax(kind) if kind != SyntaxKind::TOMBSTONE => {
+                                builder.start_node(kind.into())
+                            }
+                            NodeKind::Error(err) => {
+                                errors.push(err);
+                                builder.start_node(SyntaxKind::PARSE_ERR.into())
+                            }
+                            _ => {}
+                        }
+                    }
+                }
+                Event::Finish => builder.finish_node(),
+                Event::Eat { count } => (0..count).for_each(|_| {
+                    let (tok, text): (SyntaxKind, &str) = raw_toks.pop().unwrap();
+                    builder.token(tok.into(), text);
+                }),
+            }
+        }
+
+        Self {
+            green_node: builder.finish(),
+            errors,
+        }
+    }
+
+    pub fn syntax(&self) -> SyntaxNode {
+        SyntaxNode::new_root(self.green_node.clone())
+    }
+
+    pub fn errors(&self) -> Vec<SyntaxError> {
+        self.errors.clone()
+    }
+
+    pub fn dissolve(self) -> (GreenNode, Vec<SyntaxError>) {
+        let Self { green_node, errors } = self;
+        (green_node, errors)
+    }
+}

crates/lang/src/lst_parser/syntax_kind.rs

@@ -0,0 +1,140 @@
+use enumset::EnumSet;
+use logos::Logos;
+
+pub fn lex(src: &str) -> Vec<(SyntaxKind, &str)> {
+    let mut lex = SyntaxKind::lexer(src);
+    let mut r = Vec::new();
+
+    while let Some(tok_res) = lex.next() {
+        r.push((tok_res.unwrap_or(SyntaxKind::LEX_ERR), lex.slice()))
+    }
+
+    r
+}
+
+#[derive(enumset::EnumSetType, Logos, Debug, PartialEq, Eq, Clone, Copy, Hash, PartialOrd, Ord)]
+#[repr(u16)]
+#[enumset(no_super_impls)]
+#[allow(non_camel_case_types)]
+pub enum SyntaxKind {
+    #[token("def")]
+    DEF_KW = 0,
+    DEF,
+    DEF_NAME,
+    DEF_BODY,
+    #[token("let")]
+    LET_KW,
+    #[token("in")]
+    IN_KW,
+    LET_IN,
+    #[token("::")]
+    PATH_SEP,
+    #[token("mod")]
+    MOD_KW,
+    MODULE,
+    MODULE_NAME,
+    MODULE_BODY,
+    USE,
+    #[token("use")]
+    USE_KW,
+    USE_PAT,
+    PAT_ITEM,
+    PAT_GLOB,
+    PAT_GROUP,
+    #[regex("[\\d]+")]
+    INT_NUM,
+    #[regex("[+-]?([\\d]+\\.[\\d]*|[\\d]*\\.[\\d]+)")]
+    FLOAT_NUM,
+    #[regex(r#""([^"\\]|\\["\\bnfrt]|u[a-fA-F0-9]{4})*""#)]
+    STRING,
+    MATRIX,
+    MAT_ROW,
+    VEC,
+    LIST,
+    // either of a vec, a matrix or a list
+    COLLECTION_ITEM,
+    PARENTHESIZED_EXPR,
+    EXPR,
+    LITERAL,
+    #[token("(")]
+    L_PAREN,
+    #[token(")")]
+    R_PAREN,
+    #[token("{")]
+    L_BRACE,
+    #[token("}")]
+    R_BRACE,
+    #[token("[")]
+    L_BRACK,
+    #[token("]")]
+    R_BRACK,
+    #[token("<")]
+    L_ANGLE,
+    #[token(">")]
+    R_ANGLE,
+    #[token("+")]
+    PLUS,
+    #[token("-")]
+    MINUS,
+    #[token("*")]
+    STAR,
+    #[token("/")]
+    SLASH,
+    #[token("%")]
+    PERCENT,
+    #[token("^")]
+    CARET,
+    INSTR,
+    INSTR_NAME,
+    INSTR_PARAMS,
+    ATTR_SET,
+    ATTR,
+    ATTR_NAME,
+    ATTR_VALUE,
+    #[regex("[a-zA-Z_]+[a-zA-Z_\\-\\d]*")]
+    IDENT,
+    #[regex("\\$[a-zA-Z0-9_\\-]+")]
+    VAR,
+    #[regex("\\@[a-zA-Z0-9_\\-]+")]
+    INPUT_VAR,
+    #[token("$")]
+    DOLLAR,
+    #[token("@")]
+    AT,
+    #[token(",")]
+    COMMA,
+    #[token("|")]
+    PIPE,
+    #[token("@|")]
+    MAPPING_PIPE,
+    #[token("!|")]
+    NULL_PIPE,
+    PIPELINE,
+    #[token("=")]
+    EQ,
+    #[token(":")]
+    COLON,
+    #[token(";")]
+    SEMICOLON,
+    #[token(".")]
+    DOT,
+    #[token("!")]
+    BANG,
+    #[regex("[ \\t\\f]+")]
+    WHITESPACE,
+    #[token("\n")]
+    NEWLINE,
+    PARSE_ERR,
+    LEX_ERR,
+    ROOT,
+    EOF,
+    TOMBSTONE,
+}
+
+pub type TokenSet = EnumSet<SyntaxKind>;
+
+impl From<SyntaxKind> for rowan::SyntaxKind {
+    fn from(kind: SyntaxKind) -> Self {
+        Self(kind as u16)
+    }
+}

crates/lang/src/main.rs

@@ -0,0 +1,29 @@
+use clap::Parser;
+use std::{fs, path::PathBuf};
+
+use lang::lst_parser::{self, grammar, input, output::Output, syntax_kind};
+
+#[derive(Parser)]
+struct Args {
+    file: PathBuf,
+}
+
+#[allow(clippy::unwrap_used)]
+fn main() {
+    let args = Args::parse();
+    let n = args.file.clone();
+    let f = fs::read_to_string(n.clone()).expect("failed to read file");
+
+    let toks = dbg!(syntax_kind::lex(&f));
+    let input = input::Input::new(&toks);
+    let mut parser = lst_parser::Parser::new(input);
+
+    grammar::source_file(&mut parser);
+
+    let p_out = dbg!(parser.finish());
+    let o = Output::from_parser_output(toks, p_out);
+
+    println!("{}", o.debug_colored());
+
+    // World::new(n);
+}

crates/lang/src/world.rs

@@ -0,0 +1,27 @@
+use std::path::Path;
+
+use self::files::{Files, OpenFileError};
+
+mod error;
+mod files;
+
+struct World;
+
+impl World {
+    pub fn new(entry_point: &Path) -> Result<Self, WorldCreationError> {
+        let mut files = Files::default();
+        let (entry_point_id, errors) = files.add_file(entry_point)?;
+
+        todo!()
+    }
+}
+
+enum WorldCreationError {
+    FailedToOpenEntryPoint(OpenFileError),
+}
+
+impl From<OpenFileError> for WorldCreationError {
+    fn from(value: OpenFileError) -> Self {
+        Self::FailedToOpenEntryPoint(value)
+    }
+}

crates/lang/src/world/error.rs

@@ -0,0 +1,10 @@
+use std::path::PathBuf;
+
+use crate::{ast::ParseError, lst_parser::error::SyntaxError};
+
+use super::files::{FileId, Loc, OpenFileError};
+
+pub enum Error {
+    Syntax(Loc<ParseError>, SyntaxError),
+    OpenFileError(OpenFileError),
+}

crates/lang/src/world/files.rs

@@ -0,0 +1,57 @@
+use std::{
+    collections::HashMap,
+    io,
+    path::{Path, PathBuf},
+};
+
+mod loc;
+
+pub use loc::Loc;
+use rowan::ast::AstNode;
+
+use crate::{
+    ast::ParseError,
+    lst_parser::{self, error::SyntaxError, input, output::Output},
+    world::{error::Error, files::source_file::SourceFile},
+};
+
+#[derive(Default)]
+pub struct Files {
+    inner: Vec<source_file::SourceFile>,
+    path_to_id_map: HashMap<PathBuf, FileId>,
+}
+
+impl Files {
+    pub fn add_file(&mut self, path: &Path) -> Result<(FileId, Vec<Error>), OpenFileError> {
+        if !path.exists() {
+            return Err(OpenFileError::NotFound(path.to_owned()));
+        }
+
+        let file_id = FileId(self.inner.len());
+        let (source_file, errs) = match SourceFile::open(path) {
+            Ok((source_file, errs)) => {
+                let errs = errs
+                    .into_iter()
+                    .map(|(ptr, err)| Error::Syntax(Loc::from_ptr(ptr, file_id), err))
+                    .collect::<Vec<_>>();
+                (source_file, errs)
+            }
+            Err(e) => return Err(OpenFileError::IoError(path.to_path_buf(), e)),
+        };
+
+        self.inner.push(source_file);
+        self.path_to_id_map.insert(path.to_path_buf(), file_id);
+
+        Ok((file_id, errs))
+    }
+}
+
+pub enum OpenFileError {
+    NotFound(PathBuf),
+    IoError(PathBuf, std::io::Error),
+}
+
+#[derive(Copy, Clone, Debug)]
+pub struct FileId(usize);
+
+mod source_file;

crates/lang/src/world/files/loc.rs

@@ -0,0 +1,29 @@
+use rowan::ast::{AstNode, AstPtr};
+
+use crate::Lang;
+
+use super::FileId;
+
+#[derive(Clone)]
+pub struct Loc<N: AstNode<Language = Lang>> {
+    file: FileId,
+    syntax: AstPtr<N>,
+}
+
+impl<N: AstNode<Language = Lang>> Loc<N> {
+    pub fn new(node: N, file: FileId) -> Self {
+        Self::from_ptr(AstPtr::new(&node), file)
+    }
+
+    pub fn from_ptr(ptr: AstPtr<N>, file: FileId) -> Self {
+        Self { file, syntax: ptr }
+    }
+
+    pub fn file(&self) -> FileId {
+        self.file
+    }
+
+    pub fn syntax(&self) -> AstPtr<N> {
+        self.syntax.clone()
+    }
+}

crates/lang/src/world/files/source_file.rs

@@ -0,0 +1,113 @@
+use crate::lst_parser::{self, grammar, input, syntax_kind};
+use crate::SyntaxNode;
+
+use crate::lst_parser::output::Output;
+
+use crate::lst_parser::error::SyntaxError;
+
+use crate::ast::ParseError;
+
+use rowan::ast::{AstNode, AstPtr};
+
+use std::path::Path;
+use std::{fs, io};
+
+use rowan::GreenNode;
+
+use std::path::PathBuf;
+
+pub(crate) struct SourceFile {
+    pub(crate) path: PathBuf,
+    pub(crate) lst: rowan::GreenNode,
+}
+
+impl SourceFile {
+    pub(crate) fn open(p: &Path) -> io::Result<(Self, Vec<(AstPtr<ParseError>, SyntaxError)>)> {
+        assert!(p.exists());
+
+        let f = fs::read_to_string(p)?;
+        let (lst, errs) = Self::parse(f);
+
+        Ok((
+            Self {
+                path: p.to_path_buf(),
+                lst,
+            },
+            errs,
+        ))
+    }
+
+    pub(crate) fn parse(f: String) -> (GreenNode, Vec<(AstPtr<ParseError>, SyntaxError)>) {
+        let toks = syntax_kind::lex(&f);
+        let input = input::Input::new(&toks);
+        let mut parser = lst_parser::Parser::new(input);
+
+        grammar::source_file(&mut parser);
+
+        let p_out = parser.finish();
+        let (lst, errs) = Output::from_parser_output(toks, p_out).dissolve();
+
+        (lst.clone(), Self::find_errs(lst, errs))
+    }
+
+    pub(crate) fn find_errs(
+        lst: GreenNode,
+        mut errs: Vec<SyntaxError>,
+    ) -> Vec<(AstPtr<ParseError>, SyntaxError)> {
+        let mut out = Vec::new();
+        errs.reverse();
+
+        let lst = SyntaxNode::new_root(lst);
+        Self::find_errs_recursive(&mut out, lst, &mut errs);
+
+        out
+    }
+
+    pub(crate) fn find_errs_recursive(
+        mut out: &mut Vec<(AstPtr<ParseError>, SyntaxError)>,
+        lst: SyntaxNode,
+        mut errs: &mut Vec<SyntaxError>,
+    ) {
+        lst.children()
+            .filter_map(|c| ParseError::cast(c))
+            .for_each(|e| out.push((AstPtr::new(&e), errs.pop().unwrap())));
+
+        lst.children()
+            .for_each(|c| Self::find_errs_recursive(out, c, errs));
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::world::files::source_file::SourceFile;
+
+    fn check_find_errs(input: &str, expected: &[&str]) {
+        let (_, errs) = SourceFile::parse(input.to_string());
+
+        let errs = errs
+            .into_iter()
+            .map(|(loc, err)| format!("{:?}@{:?}", err, loc.syntax_node_ptr().text_range()))
+            .collect::<Vec<String>>();
+
+        assert_eq!(
+            errs,
+            expected
+                .into_iter()
+                .map(|s| s.to_string())
+                .collect::<Vec<_>>()
+        )
+    }
+
+    #[test]
+    fn test_find_errs() {
+        check_find_errs(
+            "def meow = ;\n mod ;",
+            &["Expected([DEF_BODY])@11..11", "Expected([IDENT])@18..18"],
+        );
+
+        check_find_errs(
+            "def awawa = a |",
+            &["UnterminatedTopLevelItem@0..15", "PipelineNeedsSink@12..15"],
+        )
+    }
+}

crates/pawarser/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "pawarser"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+rowan = "0.15.15"
+drop_bomb = "0.1.5"
+enumset = "1.1.3"
+
+[lints]
+workspace = true

crates/pawarser/src/lib.rs

@@ -0,0 +1,8 @@
+#![feature(iter_collect_into)]
+pub mod parser;
+
+pub use parser::{
+    error::SyntaxError,
+    marker::{CompletedMarker, Marker},
+    Parser, SyntaxElement,
+};

crates/pawarser/src/parser.rs

@@ -0,0 +1,253 @@
+use std::{cell::Cell, fmt, marker::PhantomData, mem};
+
+use enumset::{EnumSet, EnumSetType};
+use rowan::{GreenNode, GreenNodeBuilder};
+
+use crate::parser::event::NodeKind;
+
+use self::{event::Event, input::Input, marker::Marker};
+pub use {error::SyntaxError, output::ParserOutput};
+
+pub mod error;
+mod event;
+mod input;
+pub mod marker;
+pub mod output;
+
+/// this is used to define some required SyntaxKinds like an EOF token or an error token
+pub trait SyntaxElement
+where
+    Self: EnumSetType
+        + Into<rowan::SyntaxKind>
+        + From<rowan::SyntaxKind>
+        + fmt::Debug
+        + Clone
+        + PartialEq
+        + Eq,
+{
+    /// EOF value. This will be used by the rest of the parser library to represent an EOF.
+    const SYNTAX_EOF: Self;
+    /// Error value. This will be used as a placeholder for associated respective errors.
+    const SYNTAX_ERROR: Self;
+    const SYNTAX_ROOT: Self;
+}
+
+pub struct Parser<'src, SyntaxKind: SyntaxElement, SyntaxErr: SyntaxError> {
+    input: Input<'src, SyntaxKind>,
+    pos: usize,
+    events: Vec<Event<SyntaxKind, SyntaxErr>>,
+    step_limit: u32,
+    steps: Cell<u32>,
+}
+
+impl<'src, 'toks, SyntaxKind: SyntaxElement, SyntaxErr: SyntaxError>
+    Parser<'src, SyntaxKind, SyntaxErr>
+{
+    /// eat all meaningless tokens at the end of the file.
+    pub fn eat_succeeding_meaningless(&mut self) {
+        self.push_ev(Event::Eat {
+            count: self.input.meaningless_tail_len(),
+        });
+    }
+
+    /// Get token from current position of the parser.
+    pub fn current(&self) -> SyntaxKind {
+        self.step();
+        self.input.kind(self.pos)
+    }
+
+    pub fn start(&mut self, name: &str) -> Marker {
+        let pos = self.events.len();
+        self.push_ev(Event::tombstone());
+        Marker::new(pos, name)
+    }
+
+    /// Eat next token if it's of kind `kind` and return `true`.
+    /// Otherwise, `false`.
+    pub fn eat(&mut self, kind: SyntaxKind) -> bool {
+        if !self.at(kind) {
+            return false;
+        }
+
+        self.do_bump();
+        true
+    }
+
+    pub fn do_bump(&mut self) {
+        self.push_ev(Event::Eat {
+            count: self.input.preceding_meaningless(self.pos),
+        });
+        self.pos += 1;
+    }
+
+    /// Check if the token at the current parser position is of `kind`
+    pub fn at(&self, kind: SyntaxKind) -> bool {
+        self.nth_at(0, kind)
+    }
+
+    /// Check if the token that is `n` ahead is of `kind`
+    pub fn nth_at(&self, n: usize, kind: SyntaxKind) -> bool {
+        self.nth(n) == kind
+    }
+
+    pub fn nth(&self, n: usize) -> SyntaxKind {
+        self.step();
+        self.input.kind(self.pos + n)
+    }
+
+    fn push_ev(&mut self, event: Event<SyntaxKind, SyntaxErr>) {
+        self.events.push(event);
+    }
+
+    fn step(&self) {
+        let steps = self.steps.get();
+        assert!(steps <= self.step_limit, "the parser seems stuck.");
+        self.steps.set(steps + 1);
+    }
+
+    pub fn finish(self) -> ParserOutput<SyntaxKind, SyntaxErr> {
+        let Self {
+            input,
+            pos,
+            mut events,
+            step_limit,
+            steps,
+        } = self;
+        let (mut raw_toks, meaningless_tokens) = input.dissolve();
+        let mut builder = GreenNodeBuilder::new();
+        // TODO: document what the hell a forward parent is
+        let mut fw_parents = Vec::new();
+        let mut errors: Vec<SyntaxErr> = Vec::new();
+        raw_toks.reverse();
+
+        // always have an implicit root node to avoid [`GreenNodeBuilder::finish()`] panicking due to multiple root elements.
+        builder.start_node(SyntaxKind::SYNTAX_ROOT.into());
+
+        for i in 0..events.len() {
+            match mem::replace(&mut events[i], Event::tombstone()) {
+                Event::Start {
+                    kind,
+                    forward_parent,
+                } => {
+                    if kind == NodeKind::Tombstone && forward_parent.is_none() {
+                        continue;
+                    }
+
+                    // resolving forward parents
+                    // temporarily jump around with the parser index and replace them with tombstones
+                    fw_parents.push(kind);
+                    let mut idx = i;
+                    let mut fp = forward_parent;
+                    while let Some(fwd) = fp {
+                        idx += fwd as usize;
+                        fp = match mem::replace(&mut events[idx], Event::tombstone()) {
+                            Event::Start {
+                                kind,
+                                forward_parent,
+                            } => {
+                                fw_parents.push(kind);
+                                forward_parent
+                            }
+                            _ => unreachable!(),
+                        }
+                    }
+
+                    // clear semantically meaningless tokens before the new tree node for aesthetic reasons
+                    while raw_toks
+                        .last()
+                        .is_some_and(|v| meaningless_tokens.contains(v.0))
+                    {
+                        // update first next Eat event
+                        match events.iter_mut().find(|ev| matches!(ev, Event::Eat { .. })) {
+                            Some(Event::Eat { count }) => *count -= 1,
+                            _ => unreachable!(),
+                        }
+
+                        // put whitespace into lst
+                        let (tok, text) = raw_toks.pop().unwrap();
+                        builder.token(tok.into(), text);
+                    }
+
+                    // insert forward parents into the tree in correct order
+                    for kind in fw_parents.drain(..).rev() {
+                        match kind {
+                            NodeKind::Syntax(kind) => builder.start_node(kind.into()),
+                            NodeKind::Error(err) => {
+                                errors.push(err);
+                                builder.start_node(SyntaxKind::SYNTAX_ERROR.into())
+                            }
+                            _ => {}
+                        }
+                    }
+                }
+                Event::Finish => builder.finish_node(),
+                Event::Eat { count } => (0..count).for_each(|_| {
+                    let (tok, text) = raw_toks.pop().unwrap();
+                    builder.token(tok.into(), text);
+                }),
+            }
+        }
+
+        // finish SYNTAX_ROOT
+        builder.finish_node();
+
+        ParserOutput {
+            green_node: builder.finish(),
+            errors,
+            _syntax_kind: PhantomData::<SyntaxKind>,
+        }
+    }
+}
+
+pub struct ParserBuilder<
+    'src,
+    SyntaxKind: SyntaxElement,
+    // SyntaxErr: SyntaxError,
+> {
+    raw_toks: Vec<(SyntaxKind, &'src str)>,
+    meaningless_token_kinds: EnumSet<SyntaxKind>,
+    step_limit: u32,
+}
+
+impl<'src, SyntaxKind: SyntaxElement> ParserBuilder<'src, SyntaxKind> {
+    pub fn new(raw_toks: Vec<(SyntaxKind, &'src str)>) -> Self {
+        Self {
+            raw_toks,
+            meaningless_token_kinds: EnumSet::new(),
+            step_limit: 4096,
+        }
+    }
+
+    /// Sets the parser step limit.
+    /// Defaults to 4096
+    pub fn step_limit(mut self, new: u32) -> Self {
+        self.step_limit = new;
+        self
+    }
+
+    pub fn add_meaningless(mut self, kind: SyntaxKind) -> Self {
+        self.meaningless_token_kinds.insert(kind);
+        self
+    }
+
+    pub fn add_meaningless_many(mut self, kind: Vec<SyntaxKind>) -> Self {
+        self.meaningless_token_kinds
+            .insert_all(kind.into_iter().collect());
+        self
+    }
+
+    pub fn build<SyntaxErr: SyntaxError>(self) -> Parser<'src, SyntaxKind, SyntaxErr> {
+        let Self {
+            raw_toks,
+            meaningless_token_kinds,
+            step_limit,
+        } = self;
+        Parser {
+            input: Input::new(raw_toks, Some(meaningless_token_kinds)),
+            pos: 0,
+            events: Vec::new(),
+            step_limit,
+            steps: Cell::new(0),
+        }
+    }
+}

crates/pawarser/src/parser/error.rs

@@ -0,0 +1,9 @@
+use std::fmt;
+
+/// A marker trait... for now!
+// TODO: constrain that conversion to `NodeKind::Error` is enforced to be possible
+pub trait SyntaxError
+where
+    Self: fmt::Debug + Clone + PartialEq + Eq,
+{
+}

crates/pawarser/src/parser/event.rs

@@ -0,0 +1,42 @@
+use enumset::EnumSetType;
+
+use super::{error::SyntaxError, SyntaxElement};
+
+pub enum Event<SyntaxKind: SyntaxElement, SyntaxErr: SyntaxError> {
+    Start {
+        kind: NodeKind<SyntaxKind, SyntaxErr>,
+        forward_parent: Option<usize>,
+    },
+    Finish,
+    Eat {
+        count: usize,
+    },
+}
+
+impl<SyntaxKind: SyntaxElement, SyntaxErr: SyntaxError> Event<SyntaxKind, SyntaxErr> {
+    pub fn tombstone() -> Self {
+        Self::Start {
+            kind: NodeKind::Tombstone,
+            forward_parent: None,
+        }
+    }
+}
+
+#[derive(Clone, PartialEq, Eq)]
+pub enum NodeKind<SyntaxKind: SyntaxElement, SyntaxErr: SyntaxError> {
+    Tombstone,
+    Syntax(SyntaxKind),
+    Error(SyntaxErr),
+}
+
+impl<SyntaxKind: SyntaxElement, SyntaxErr: SyntaxError> NodeKind<SyntaxKind, SyntaxErr> {
+    pub fn is_tombstone(&self) -> bool {
+        matches!(self, Self::Tombstone)
+    }
+    pub fn is_syntax(&self) -> bool {
+        matches!(self, Self::Syntax(_))
+    }
+    pub fn is_error(&self) -> bool {
+        matches!(self, Self::Error(_))
+    }
+}

crates/pawarser/src/parser/input.rs

@@ -0,0 +1,67 @@
+use enumset::{EnumSet, EnumSetType};
+
+use super::SyntaxElement;
+
+pub struct Input<'src, SyntaxKind: SyntaxElement> {
+    raw: Vec<(SyntaxKind, &'src str)>,
+    // enumset of meaningless tokens
+    semantically_meaningless: EnumSet<SyntaxKind>,
+    // indices of non-meaningless tokens
+    meaningful_toks: Vec<usize>,
+}
+
+impl<'src, SyntaxKind: SyntaxElement> Input<'src, SyntaxKind> {
+    pub fn new(
+        raw_toks: Vec<(SyntaxKind, &'src str)>,
+        meaningless: Option<EnumSet<SyntaxKind>>,
+    ) -> Self {
+        let mut meaningful_toks = Vec::new();
+
+        if let Some(meaningless) = meaningless {
+            let meaningful_toks = raw_toks
+                .iter()
+                .enumerate()
+                .filter_map(|(i, tok)| (!meaningless.contains(tok.0)).then_some(i))
+                .collect_into(&mut meaningful_toks);
+        }
+
+        Self {
+            raw: raw_toks,
+            semantically_meaningless: meaningless.unwrap_or_default(),
+            meaningful_toks,
+        }
+    }
+
+    pub fn kind(&self, idx: usize) -> SyntaxKind {
+        let Some(meaningful_idx) = self.meaningful_toks.get(idx) else {
+            return SyntaxKind::SYNTAX_EOF;
+        };
+
+        self.raw.get(*meaningful_idx).unwrap().0
+    }
+
+    pub fn preceding_meaningless(&self, idx: usize) -> usize {
+        assert!(self.meaningful_toks.len() > idx);
+
+        if idx == 0 {
+            // maybe should be `self.meaningful_toks[idx]` instead??
+            1
+        } else {
+            self.meaningful_toks[idx] - self.meaningful_toks[idx - 1]
+        }
+    }
+
+    /// get the count of meaningless tokens at the end of the file.
+    pub fn meaningless_tail_len(&self) -> usize {
+        self.raw.len() - (self.meaningful_toks.last().unwrap() + 1)
+    }
+
+    pub fn dissolve(self) -> (Vec<(SyntaxKind, &'src str)>, EnumSet<SyntaxKind>) {
+        let Self {
+            raw,
+            semantically_meaningless,
+            ..
+        } = self;
+        (raw, semantically_meaningless)
+    }
+}

crates/pawarser/src/parser/marker.rs

@@ -0,0 +1,97 @@
+use drop_bomb::DropBomb;
+use rowan::SyntaxKind;
+
+use super::{
+    error::SyntaxError,
+    event::{Event, NodeKind},
+    Parser, SyntaxElement,
+};
+
+pub struct Marker {
+    pos: usize,
+    bomb: DropBomb,
+}
+
+impl Marker {
+    pub(super) fn new(pos: usize, name: &str) -> Self {
+        Self {
+            pos,
+            bomb: DropBomb::new(format!("Marker {name} must be completed or abandoned.")),
+        }
+    }
+
+    fn close_node<SyntaxKind: SyntaxElement, SyntaxErr: SyntaxError>(
+        mut self,
+        p: &mut Parser<SyntaxKind, SyntaxErr>,
+        kind: NodeKind<SyntaxKind, SyntaxErr>,
+    ) -> CompletedMarker<SyntaxKind, SyntaxErr> {
+        self.bomb.defuse();
+
+        match &mut p.events[self.pos] {
+            Event::Start { kind: slot, .. } => *slot = kind.clone(),
+            _ => unreachable!(),
+        }
+
+        p.push_ev(Event::Finish);
+        CompletedMarker {
+            pos: self.pos,
+            kind,
+        }
+    }
+
+    pub fn complete<SyntaxKind: SyntaxElement, SyntaxErr: SyntaxError>(
+        self,
+        p: &mut Parser<SyntaxKind, SyntaxErr>,
+        kind: SyntaxKind,
+    ) -> CompletedMarker<SyntaxKind, SyntaxErr> {
+        self.close_node(p, NodeKind::Syntax(kind))
+    }
+
+    pub fn error<SyntaxKind: SyntaxElement, SyntaxErr: SyntaxError>(
+        self,
+        p: &mut Parser<SyntaxKind, SyntaxErr>,
+        kind: SyntaxErr,
+    ) -> CompletedMarker<SyntaxKind, SyntaxErr> {
+        self.close_node(p, NodeKind::Error(kind))
+    }
+
+    pub fn abandon<SyntaxKind: SyntaxElement, SyntaxErr: SyntaxError>(
+        mut self,
+        p: &mut Parser<SyntaxKind, SyntaxErr>,
+    ) {
+        self.bomb.defuse();
+
+        // clean up empty tombstone event from marker
+        if self.pos == p.events.len() - 1 {
+            match p.events.pop() {
+                Some(Event::Start {
+                    kind: NodeKind::Tombstone,
+                    forward_parent: None,
+                }) => (),
+                _ => unreachable!(),
+            }
+        }
+    }
+}
+
+pub struct CompletedMarker<SyntaxKind: SyntaxElement, SyntaxErr: SyntaxError> {
+    pos: usize,
+    kind: NodeKind<SyntaxKind, SyntaxErr>,
+}
+
+impl<SyntaxKind: SyntaxElement, SyntaxErr: SyntaxError> CompletedMarker<SyntaxKind, SyntaxErr> {
+    pub fn precede(self, p: &mut Parser<SyntaxKind, SyntaxErr>, name: &str) -> Marker {
+        let new_pos = p.start(name);
+
+        match &mut p.events[self.pos] {
+            Event::Start { forward_parent, .. } => {
+                // point forward parent of the node this marker completed to the new node
+                // will later be used to make the new node a parent of the current node.
+                *forward_parent = Some(new_pos.pos - self.pos)
+            }
+            _ => unreachable!(),
+        }
+
+        new_pos
+    }
+}

crates/pawarser/src/parser/output.rs

@@ -0,0 +1,73 @@
+use std::{fmt, marker::PhantomData};
+
+use rowan::{GreenNode, GreenNodeData, GreenTokenData, NodeOrToken};
+
+use crate::{SyntaxElement, SyntaxError};
+
+pub struct ParserOutput<SyntaxKind: SyntaxElement, SyntaxErr: SyntaxError> {
+    pub green_node: GreenNode,
+    pub errors: Vec<SyntaxErr>,
+    pub(super) _syntax_kind: PhantomData<SyntaxKind>,
+}
+
+impl<SyntaxKind: SyntaxElement, SyntaxErr: SyntaxError> std::fmt::Debug
+    for ParserOutput<SyntaxKind, SyntaxErr>
+{
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        let mut errs: Vec<&SyntaxErr> = self.errors.iter().collect();
+        errs.reverse();
+        debug_print_output::<SyntaxKind, SyntaxErr>(
+            NodeOrToken::Node(&self.green_node),
+            f,
+            0,
+            &mut errs,
+        )
+    }
+}
+
+fn debug_print_output<SyntaxKind: SyntaxElement, SyntaxErr: SyntaxError>(
+    node: NodeOrToken<&GreenNodeData, &GreenTokenData>,
+    f: &mut std::fmt::Formatter<'_>,
+    lvl: i32,
+    errs: &mut Vec<&SyntaxErr>,
+) -> std::fmt::Result {
+    if f.alternate() {
+        for _ in 0..lvl {
+            f.write_str("    ")?;
+        }
+    }
+    let maybe_newline = if f.alternate() { "\n" } else { " " };
+
+    match node {
+        NodeOrToken::Node(n) => {
+            let kind: SyntaxKind = node.kind().into();
+            if kind != SyntaxKind::SYNTAX_ERROR {
+                write!(f, "{:?} {{{maybe_newline}", kind)?;
+            } else {
+                let err = errs
+                    .pop()
+                    .expect("all error syntax nodes should correspond to an error");
+
+                write!(f, "{:?}: {err:?} {{{maybe_newline}", kind)?;
+            }
+            for c in n.children() {
+                debug_print_output::<SyntaxKind, SyntaxErr>(c, f, lvl + 1, errs)?;
+            }
+
+            if f.alternate() {
+                for _ in 0..lvl {
+                    f.write_str("    ")?;
+                }
+            }
+            write!(f, "}}{maybe_newline}")
+        }
+        NodeOrToken::Token(t) => {
+            write!(
+                f,
+                "{:?} {:?};{maybe_newline}",
+                Into::<SyntaxKind>::into(t.kind()),
+                t.text()
+            )
+        }
+    }
+}

crates/prowocessing/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "prowocessing"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+image = "0.24.8"
+palette = "0.7.4"
+
+[lints]
+workspace = true

crates/prowocessing/src/experimental.rs

@@ -0,0 +1,2 @@
+pub mod enum_based;
+pub mod trait_based;

crates/prowocessing/src/experimental/enum_based.rs

@@ -0,0 +1,64 @@
+pub enum Instruction {
+    Uppercase,
+    Lowercase,
+}
+
+pub struct Pipeline {
+    pipeline: Vec<fn(String) -> String>,
+}
+
+impl Pipeline {
+    pub fn run(&self, val: String) -> String {
+        let mut current = val;
+
+        for instr in &self.pipeline {
+            current = instr(current);
+        }
+
+        current
+    }
+}
+
+pub struct PipelineBuilder {
+    pipeline: Vec<Instruction>,
+}
+
+impl PipelineBuilder {
+    pub fn new() -> Self {
+        Self {
+            pipeline: Vec::new(),
+        }
+    }
+
+    #[must_use]
+    pub fn insert(mut self, instr: Instruction) -> Self {
+        self.pipeline.push(instr);
+        self
+    }
+
+    pub fn build(&self) -> Pipeline {
+        fn uppercase(v: String) -> String {
+            str::to_uppercase(&v)
+        }
+        fn lowercase(v: String) -> String {
+            str::to_lowercase(&v)
+        }
+
+        let mut res = Vec::new();
+
+        for item in &self.pipeline {
+            res.push(match item {
+                Instruction::Uppercase => uppercase,
+                Instruction::Lowercase => lowercase,
+            });
+        }
+
+        Pipeline { pipeline: res }
+    }
+}
+
+impl Default for PipelineBuilder {
+    fn default() -> Self {
+        Self::new()
+    }
+}

crates/prowocessing/src/experimental/trait_based.rs

@@ -0,0 +1,11 @@
+//! An experiment for a hyper-modular trait-based architecture.
+//!
+//! Patterns defining this (or well, which I reference a lot while writing this):
+//! - [Command pattern using trait objects](https://rust-unofficial.github.io/patterns/patterns/behavioural/command.html)
+//! - [Builder pattern](https://rust-unofficial.github.io/patterns/patterns/creational/builder.html)
+
+pub mod data;
+#[macro_use]
+pub mod element;
+pub mod ops;
+pub mod pipeline;

crates/prowocessing/src/experimental/trait_based/data.rs

@@ -0,0 +1,5 @@
+//! Definitions of the data transfer and storage types.
+
+pub mod io;
+
+pub mod raw;

crates/prowocessing/src/experimental/trait_based/data/io.rs

@@ -0,0 +1,53 @@
+//! Types for element and pipeline IO
+
+use std::{borrow::ToOwned, convert::Into};
+
+use super::raw::Data;
+
+/// Newtype struct with borrowed types for pipeline/element inputs, so that doesn't force a move or clone
+#[derive(PartialEq, Eq, Debug)]
+pub struct Inputs<'a>(pub Vec<&'a Data>);
+
+impl<'a> From<Vec<&'a Data>> for Inputs<'a> {
+    fn from(value: Vec<&'a Data>) -> Self {
+        Self(value)
+    }
+}
+
+impl<'a, T: Into<&'a Data>> From<T> for Inputs<'a> {
+    fn from(value: T) -> Self {
+        Self(vec![value.into()])
+    }
+}
+
+impl<'a> From<&'a Outputs> for Inputs<'a> {
+    fn from(value: &'a Outputs) -> Self {
+        Self(value.0.iter().map(Into::into).collect())
+    }
+}
+
+/// Used for pipeline/element outputs
+#[derive(PartialEq, Eq, Debug)]
+pub struct Outputs(pub Vec<Data>);
+
+impl Outputs {
+    /// consume self and return inner value(s)
+    pub fn into_inner(self) -> Vec<Data> {
+        self.0
+    }
+}
+impl From<Vec<Data>> for Outputs {
+    fn from(value: Vec<Data>) -> Self {
+        Self(value)
+    }
+}
+impl<T: Into<Data>> From<T> for Outputs {
+    fn from(value: T) -> Self {
+        Self(vec![value.into()])
+    }
+}
+impl From<Inputs<'_>> for Outputs {
+    fn from(value: Inputs) -> Self {
+        Self(value.0.into_iter().map(ToOwned::to_owned).collect())
+    }
+}

crates/prowocessing/src/experimental/trait_based/data/raw.rs

@@ -0,0 +1,20 @@
+//! Dynamic data storage and transfer types for use in [`io`]
+
+// Dynamic data type
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub enum Data {
+    String(String),
+    Int(i32),
+}
+
+impl From<String> for Data {
+    fn from(value: String) -> Self {
+        Self::String(value)
+    }
+}
+
+impl From<i32> for Data {
+    fn from(value: i32) -> Self {
+        Self::Int(value)
+    }
+}

crates/prowocessing/src/experimental/trait_based/element.rs

@@ -0,0 +1,29 @@
+//! The trait and type representations
+
+use std::any::TypeId;
+
+use crate::experimental::trait_based::data::io::Inputs;
+
+use super::data::io::Outputs;
+
+pub(crate) trait PipelineElement {
+    /// return a static runner function pointer to avoid dynamic dispatch during pipeline execution - Types MUST match the signature
+    fn runner(&self) -> fn(&Inputs) -> Outputs;
+    /// return the signature of the element
+    fn signature(&self) -> ElementSignature;
+}
+
+/// Type signature for an element used for static checking
+pub(crate) struct ElementSignature {
+    pub inputs: Vec<TypeId>,
+    pub outputs: Vec<TypeId>,
+}
+
+macro_rules! signature {
+    ($($inputs:ty),+ => $($outputs:ty),+) => (
+        ElementSignature {
+            inputs: vec![$(std::any::TypeId::of::<$inputs>(), )+],
+            outputs: vec![$(std::any::TypeId::of::<$outputs>(), )+]
+        }
+    )
+}

crates/prowocessing/src/experimental/trait_based/ops.rs

@@ -0,0 +1,7 @@
+mod num;
+mod str;
+
+pub mod prelude {
+    pub(crate) use super::num::*;
+    pub(crate) use super::str::*;
+}

crates/prowocessing/src/experimental/trait_based/ops/num.rs

@@ -0,0 +1,62 @@
+//! Operations on numeric data
+use core::panic;
+use std::any::TypeId;
+
+use crate::experimental::trait_based::{
+    data::{
+        io::{Inputs, Outputs},
+        raw::Data,
+    },
+    element::{ElementSignature, PipelineElement},
+};
+
+/// Addition
+pub struct Add(pub i32);
+impl PipelineElement for Add {
+    fn runner(&self) -> fn(&Inputs) -> Outputs {
+        |input| {
+            let [Data::Int(i0), Data::Int(i1), ..] = input.0[..] else {
+                panic!("Invalid data passed")
+            };
+            (i0 + i1).into()
+        }
+    }
+
+    fn signature(&self) -> ElementSignature {
+        signature!(i32, i32 => i32)
+    }
+}
+
+/// Subtraction
+pub struct Subtract(pub i32);
+impl PipelineElement for Subtract {
+    fn runner(&self) -> fn(&Inputs) -> Outputs {
+        |input| {
+            let [Data::Int(i0), Data::Int(i1), ..] = input.0[..] else {
+                panic!("Invalid data passed")
+            };
+            (i0 + i1).into()
+        }
+    }
+
+    fn signature(&self) -> ElementSignature {
+        signature!(i32, i32 => i32)
+    }
+}
+
+/// Turn input to string
+pub struct Stringify;
+impl PipelineElement for Stringify {
+    fn runner(&self) -> fn(&Inputs) -> Outputs {
+        |input| {
+            let [Data::Int(int), ..] = input.0[..] else {
+                panic!("Invalid data passed")
+            };
+            int.to_string().into()
+        }
+    }
+
+    fn signature(&self) -> ElementSignature {
+        signature!(i32 => String)
+    }
+}

crates/prowocessing/src/experimental/trait_based/ops/str.rs

@@ -0,0 +1,59 @@
+//! Operation on String/text data
+use crate::experimental::trait_based::{
+    data::{
+        io::{Inputs, Outputs},
+        raw::Data,
+    },
+    element::{ElementSignature, PipelineElement},
+};
+
+/// Concatenate the inputs
+pub struct Concatenate(pub String);
+impl PipelineElement for Concatenate {
+    fn runner(&self) -> fn(&Inputs) -> Outputs {
+        |input| {
+            let [Data::String(s0), Data::String(s1), ..] = input.0[..] else {
+                panic!("Invalid data passed")
+            };
+            format!("{s0}{s1}").into()
+        }
+    }
+
+    fn signature(&self) -> ElementSignature {
+        signature!(String, String => String)
+    }
+}
+
+/// Turn input text to uppercase
+pub struct Upper;
+impl PipelineElement for Upper {
+    fn runner(&self) -> fn(&Inputs) -> Outputs {
+        |input| {
+            let [Data::String(s), ..] = input.0[..] else {
+                panic!("Invalid data passed")
+            };
+            s.to_uppercase().into()
+        }
+    }
+
+    fn signature(&self) -> ElementSignature {
+        signature!(String => String)
+    }
+}
+
+/// Turn input text to lowercase
+pub struct Lower;
+impl PipelineElement for Lower {
+    fn runner(&self) -> fn(&Inputs) -> Outputs {
+        |input| {
+            let [Data::String(s), ..] = input.0[..] else {
+                panic!("Invalid data passed")
+            };
+            s.to_lowercase().into()
+        }
+    }
+
+    fn signature(&self) -> ElementSignature {
+        signature!(String => String)
+    }
+}

crates/prowocessing/src/experimental/trait_based/pipeline.rs

@@ -0,0 +1,107 @@
+use super::data::io::{Inputs, Outputs};
+use super::element::PipelineElement;
+use super::ops::prelude::*;
+
+/// Builder for the pipelines that are actually run
+///
+/// TODO:
+/// - Bind additional inputs if instruction has more then one and is passd without any additional
+/// - allow binding to pointers to other pipelines?
+/// - allow referencing earlier data
+pub struct PipelineBuilder {
+    elements: Vec<Box<dyn PipelineElement>>,
+}
+
+impl PipelineBuilder {
+    /// Create new, empty builder
+    pub fn new() -> Self {
+        Self {
+            elements: Vec::new(),
+        }
+    }
+
+    /// Insert element into pipeline
+    fn insert<T: PipelineElement + 'static>(mut self, el: T) -> Self {
+        if let Some(previous_item) = self.elements.last() {
+            assert_eq!(
+                previous_item.signature().outputs[0],
+                el.signature().inputs[0]
+            );
+        }
+        self.elements.push(Box::new(el));
+        self
+    }
+
+    /// insert string concatenattion element
+    #[must_use]
+    pub fn concatenate(self, sec: String) -> Self {
+        self.insert(Concatenate(sec))
+    }
+
+    /// insert string uppercase element
+    #[must_use]
+    pub fn upper(self) -> Self {
+        self.insert(Upper)
+    }
+
+    /// insert string lowercase element
+    #[must_use]
+    pub fn lower(self) -> Self {
+        self.insert(Lower)
+    }
+
+    /// insert numeric addition element
+    #[must_use]
+    #[allow(
+        clippy::should_implement_trait,
+        reason = "is not equivalent to addition"
+    )]
+    pub fn add(self, sec: i32) -> Self {
+        self.insert(Add(sec))
+    }
+
+    /// insert numeric subtraction element
+    #[must_use]
+    pub fn subtract(self, sec: i32) -> Self {
+        self.insert(Subtract(sec))
+    }
+
+    /// insert stringify element
+    #[must_use]
+    pub fn stringify(self) -> Self {
+        self.insert(Stringify)
+    }
+
+    /// Build the pipeline. Doesn't check again - `insert` should verify correctness.
+    pub fn build(&self) -> Pipeline {
+        let mut r = Vec::new();
+
+        self.elements.iter().for_each(|el| r.push(el.runner()));
+
+        Pipeline { runners: r }
+    }
+}
+
+impl Default for PipelineBuilder {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+/// Runnable pipeline - at the core of this library
+pub struct Pipeline {
+    runners: Vec<fn(&Inputs) -> Outputs>,
+}
+
+impl Pipeline {
+    /// run the pipeline
+    pub fn run(&self, inputs: Inputs) -> Outputs {
+        let mut out: Outputs = inputs.into();
+
+        for runner in &self.runners {
+            out = runner(&(&out).into());
+        }
+
+        out
+    }
+}

crates/prowocessing/src/lib.rs

@@ -0,0 +1,40 @@
+//! # This is the image processing library for iOwO
+//!
+//! One of the design goals for this library is, however, to be a simple, generic image processing library.
+//! For now, it's just indev... lets see what comes of it!
+#![feature(lint_reasons)]
+
+/// just some experiments, to test whether the architecture i want is even possible (or how to do it). probably temporary.
+/// Gonna first try string processing...
+pub mod experimental;
+
+#[cfg(test)]
+mod tests {
+    use crate::experimental::{
+        enum_based,
+        trait_based::{self, data::io::Outputs},
+    };
+
+    #[test]
+    fn test_enums() {
+        let builder = enum_based::PipelineBuilder::new().insert(enum_based::Instruction::Uppercase);
+        let upr = builder.build();
+        let upr_lowr = builder.insert(enum_based::Instruction::Lowercase).build();
+
+        assert_eq!(upr.run(String::from("Test")), String::from("TEST"));
+        assert_eq!(upr_lowr.run(String::from("Test")), String::from("test"));
+    }
+
+    #[test]
+    fn add() {
+        let pipe = trait_based::pipeline::PipelineBuilder::new()
+            .add(0)
+            .stringify()
+            .build();
+
+        assert_eq!(
+            pipe.run(vec![&2.into(), &3.into()].into()),
+            Outputs(vec![String::from("5").into()])
+        );
+    }
+}

crates/svg-filters/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "svg-filters"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+csscolorparser = "0.6.2"
+indexmap = "2.2.5"
+petgraph = { workspace = true }
+quick-xml = { version = "0.31.0", features = ["serialize"] }
+
+[lints]
+workspace = true

crates/svg-filters/src/codegen.rs

@@ -0,0 +1,158 @@
+use std::{
+    cmp,
+    collections::{BTreeSet, HashMap},
+    fmt::Display,
+    io::Read,
+    ops::Not,
+};
+
+use indexmap::IndexMap;
+use petgraph::{
+    algo::toposort,
+    graph::DiGraph,
+    prelude::{EdgeIndex, NodeIndex},
+};
+use quick_xml::ElementWriter;
+
+use crate::{
+    types::{
+        graph::{edge::Edge, FilterGraph, NodeInput},
+        nodes::{primitives::WriteElement, CommonAttrs},
+    },
+    Node,
+};
+
+use self::error::CodegenError;
+
+pub struct SvgDocument {
+    filters: HashMap<String, FilterGraph>,
+}
+
+impl SvgDocument {
+    pub fn new() -> Self {
+        Self {
+            filters: HashMap::new(),
+        }
+    }
+
+    #[allow(clippy::unwrap_used, reason = "we literally just did the insertion")]
+    pub fn create_filter(&mut self, id: impl ToString) -> &mut FilterGraph {
+        let filter = FilterGraph::new();
+
+        self.filters.insert(id.to_string(), filter);
+        self.filters.get_mut(&id.to_string()).unwrap()
+    }
+
+    pub fn generate_svg_pretty(&self) -> String {
+        let mut result = Vec::new();
+        let doc_writer = quick_xml::Writer::new_with_indent(&mut result, b' ', 2);
+
+        self.generate(doc_writer);
+
+        String::from_utf8_lossy(&result).to_string()
+    }
+
+    pub fn generate_svg(&self) -> String {
+        let mut result = Vec::new();
+        let doc_writer = quick_xml::Writer::new(&mut result);
+
+        self.generate(doc_writer);
+
+        String::from_utf8_lossy(&result).to_string()
+    }
+
+    fn generate(&self, mut doc_writer: quick_xml::Writer<&mut Vec<u8>>) {
+        doc_writer
+            .create_element("svg")
+            .write_inner_content(|writer| {
+                self.filters
+                    .iter()
+                    .try_fold(writer, Self::gen_filter)
+                    .map(|_| {})
+            });
+    }
+
+    fn gen_filter<'w, 'r>(
+        writer: &'w mut quick_xml::Writer<&'r mut Vec<u8>>,
+        (id, graph): (&String, &FilterGraph),
+    ) -> Result<&'w mut quick_xml::Writer<&'r mut Vec<u8>>, CodegenError> {
+        writer
+            .create_element("filter")
+            .with_attribute(("id", id.as_str()))
+            .write_inner_content(|writer| Self::graph_to_svg(writer, graph))
+    }
+
+    fn graph_to_svg(
+        writer: &mut quick_xml::Writer<&mut Vec<u8>>,
+        graph: &FilterGraph,
+    ) -> Result<(), CodegenError> {
+        let sorted = toposort(&graph.dag, None).expect("no cycles allowed in a DAG");
+        sorted
+            .into_iter()
+            .filter_map(|node_idx| {
+                graph
+                    .dag
+                    .node_weight(node_idx)
+                    .and_then(|node| node.primitive())
+                    .map(|(primitive, common_attrs)| (node_idx, primitive, common_attrs))
+            })
+            .try_fold(writer, |writer, (node_idx, primitive, common_attrs)| {
+                primitive.element_writer(
+                    writer,
+                    *common_attrs,
+                    graph
+                        .inputs(node_idx)
+                        .into_iter()
+                        .map(|v| v.to_string())
+                        .collect(),
+                    graph
+                        .outputs(node_idx)
+                        .is_empty()
+                        .not()
+                        .then_some(format!("r{}", node_idx.index())),
+                )
+            })?;
+
+        Ok(())
+    }
+}
+
+/// convenience method to avoid fuckups during future changes
+fn format_edge_idx(idx: EdgeIndex) -> String {
+    format!("edge{}", idx.index())
+}
+
+fn format_node_idx(node_idx: NodeIndex) -> String {
+    format!("r{}", node_idx.index())
+}
+
+mod error {
+    use std::{error::Error, fmt::Display};
+
+    #[derive(Debug)]
+    pub enum CodegenError {
+        QuickXmlError(quick_xml::Error),
+    }
+
+    impl From<quick_xml::Error> for CodegenError {
+        fn from(value: quick_xml::Error) -> Self {
+            Self::QuickXmlError(value)
+        }
+    }
+
+    impl Display for CodegenError {
+        fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+            match self {
+                CodegenError::QuickXmlError(e) => e.fmt(f),
+            }
+        }
+    }
+
+    impl Error for CodegenError {}
+}
+
+impl Default for SvgDocument {
+    fn default() -> Self {
+        Self::new()
+    }
+}

crates/svg-filters/src/lib.rs

@@ -0,0 +1,40 @@
+#![feature(lint_reasons)]
+
+#[macro_use]
+pub mod util {
+    macro_rules! gen_attr {
+        ($name:literal = $out:expr) => {
+            quick_xml::events::attributes::Attribute {
+                key: quick_xml::name::QName($name),
+                value: std::borrow::Cow::from(($out).to_string().into_bytes()),
+            }
+        };
+    }
+
+    macro_rules! gen_attrs {
+        ($($name:literal: $out:expr),+) => {
+            vec![
+                $(gen_attr!($name = $out)),+
+            ]
+        };
+        ($($cond:expr => $name:literal: $out:expr),+) => {
+             {
+                let mut r = Vec::new();
+                $(if $cond {
+                    r.push(gen_attr!($name = $out));
+                })+
+                r
+            }
+        };
+        ($other:ident; $($cond:expr => $name:literal: $out:expr),+) => {
+            $other.append(&mut gen_attrs![$($cond => $name: $out),+]);
+        };
+    }
+}
+
+pub mod codegen;
+pub mod types;
+pub use types::nodes::Node;
+
+#[cfg(test)]
+mod tests;

crates/svg-filters/src/main.rs

@@ -0,0 +1,65 @@
+use svg_filters::{
+    codegen::SvgDocument,
+    types::nodes::{
+        primitives::{
+            blend::BlendMode,
+            color_matrix::ColorMatrixType,
+            component_transfer::TransferFn,
+            displacement_map::Channel,
+            turbulence::{NoiseType, StitchTiles},
+        },
+        standard_input::StandardInput,
+    },
+};
+
+fn main() {
+    let mut doc = SvgDocument::new();
+
+    let f = doc.create_filter("cmyk-chromabb");
+
+    let noise = f.turbulence(0., 0.1, 2, 0, StitchTiles::Stitch, NoiseType::FractalNoise);
+    let noise = f.component_transfer_rgba(
+        noise,
+        TransferFn::Discrete {
+            table_values: vec![0., 0.2, 0.4, 0.6, 0.8, 1.],
+        },
+        TransferFn::Discrete {
+            table_values: vec![0., 0.2, 0.4, 0.6, 0.8, 1.],
+        },
+        TransferFn::Discrete {
+            table_values: vec![0., 0.2, 0.4, 0.6, 0.8, 1.],
+        },
+        TransferFn::Linear {
+            slope: 0.,
+            intercept: 0.5,
+        },
+    );
+
+    let cyan = f.color_matrix(
+        StandardInput::SourceGraphic,
+        ColorMatrixType::Matrix(Box::new([
+            0., 0., 0., 0., 0., //
+            0., 1., 0., 0., 0., //
+            0., 0., 1., 0., 0., //
+            0., 0., 0., 1., 0.,
+        ])),
+    );
+    let cyan = f.offset(cyan, 25., 0.);
+    let cyan = f.displacement_map(cyan, noise, 50., Channel::R, Channel::A);
+
+    let magenta = f.color_matrix(
+        StandardInput::SourceGraphic,
+        ColorMatrixType::Matrix(Box::new([
+            1., 0., 0., 0., 0., //
+            0., 0., 0., 0., 0., //
+            0., 0., 1., 0., 0., //
+            0., 0., 0., 1., 0.,
+        ])),
+    );
+    let magenta = f.displacement_map(magenta, noise, 50., Channel::R, Channel::A);
+    let magenta = f.offset(magenta, -25., 0.);
+
+    f.blend(cyan, magenta, BlendMode::Screen);
+
+    println!("{}", doc.generate_svg_pretty());
+}

crates/svg-filters/src/tests.rs

@@ -0,0 +1,17 @@
+mod blend;
+mod color_matrix;
+mod complex;
+mod component_transfer;
+mod displacement_map;
+mod flood;
+mod gaussian_blur;
+mod offset;
+mod turbulence;
+mod composite {}
+mod convolve_matrix {}
+mod diffuse_lighting {}
+mod image {}
+mod merge {}
+mod morphology {}
+mod specular_lighting {}
+mod tile {}

crates/svg-filters/src/tests/blend.rs

@@ -0,0 +1,20 @@
+use crate::{
+    codegen::SvgDocument,
+    types::nodes::{primitives::blend::BlendMode, standard_input::StandardInput},
+};
+
+#[test]
+fn test_offset_blend() {
+    let mut doc = SvgDocument::new();
+
+    let blend = doc.create_filter("blend");
+
+    let offset0 = blend.offset(StandardInput::SourceGraphic, 100., 0.);
+    let offset1 = blend.offset(StandardInput::SourceGraphic, -100., 0.);
+    blend.blend(offset0, offset1, BlendMode::Multiply);
+
+    assert_eq!(
+        doc.generate_svg(),
+        r#"<svg><filter id="blend"><feOffset dx="-100" dy="0" in="SourceGraphic" result="r7"/><feOffset dx="100" dy="0" in="SourceGraphic" result="r6"/><feBlend mode="multiply" in="r6" in2="r7"/></filter></svg>"#
+    );
+}

crates/svg-filters/src/tests/color_matrix.rs

@@ -0,0 +1,25 @@
+use crate::{
+    codegen::SvgDocument,
+    types::nodes::{primitives::color_matrix::ColorMatrixType, standard_input::StandardInput},
+};
+
+#[test]
+fn test_greyscale_channel_extraction() {
+    let mut doc = SvgDocument::new();
+    let greyscale = doc.create_filter("greyscale");
+
+    greyscale.color_matrix(
+        StandardInput::SourceGraphic,
+        ColorMatrixType::Matrix(Box::new([
+            1., 0., 0., 0., 0., //
+            1., 0., 0., 0., 0., //
+            1., 0., 0., 0., 0., //
+            0., 0., 0., 1., 0.,
+        ])),
+    );
+
+    assert_eq!(
+        doc.generate_svg(),
+        r#"<svg><filter id="greyscale"><feColorMatrix values="1 0 0 0 0 1 0 0 0 0 1 0 0 0 0 0 0 0 1 0" in="SourceGraphic"/></filter></svg>"#
+    );
+}

crates/svg-filters/src/tests/complex.rs

@@ -0,0 +1,51 @@
+use crate::{
+    codegen::SvgDocument,
+    types::nodes::{primitives::color_matrix::ColorMatrixType, standard_input::StandardInput},
+};
+
+#[test]
+fn test_chrom_abb() {
+    let mut doc = SvgDocument::new();
+    let chromabb = doc.create_filter("chromabb_gen");
+
+    let chan_r = chromabb.color_matrix(
+        StandardInput::SourceGraphic,
+        ColorMatrixType::Matrix(Box::new([
+            1., 0., 0., 0., 0., //
+            0., 0., 0., 0., 0., //
+            0., 0., 0., 0., 0., //
+            0., 0., 0., 1., 0.,
+        ])),
+    );
+    let offset_r = chromabb.offset(chan_r, 25., 0.);
+    let blur_r = chromabb.gaussian_blur_xy(offset_r, 5, 0);
+
+    let chan_b = chromabb.color_matrix(
+        StandardInput::SourceGraphic,
+        ColorMatrixType::Matrix(Box::new([
+            0., 0., 0., 0., 0., //
+            0., 0., 0., 0., 0., //
+            0., 0., 1., 0., 0., //
+            0., 0., 0., 1., 0.,
+        ])),
+    );
+    let offset_b = chromabb.offset(chan_b, -25., 0.);
+    let blur_b = chromabb.gaussian_blur_xy(offset_b, 5, 0);
+
+    let composite_rb = chromabb.composite_arithmetic(blur_r, blur_b, 0., 1., 1., 0.);
+
+    let chan_g = chromabb.color_matrix(
+        StandardInput::SourceGraphic,
+        ColorMatrixType::Matrix(Box::new([
+            0., 0., 0., 0., 0., //
+            0., 1., 0., 0., 0., //
+            0., 0., 0., 0., 0., //
+            0., 0., 0., 1., 0.,
+        ])),
+    );
+    chromabb.composite_arithmetic(composite_rb, chan_g, 0., 1., 1., 0.);
+    assert_eq!(
+        doc.generate_svg(),
+        r#"<svg><filter id="chromabb_gen"><feColorMatrix values="0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 1 0" in="SourceGraphic" result="r13"/><feColorMatrix values="0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 1 0" in="SourceGraphic" result="r9"/><feOffset dx="-25" dy="0" in="r9" result="r10"/><feGaussianBlur stdDeviation="5 0" in="r10" result="r11"/><feColorMatrix values="1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0" in="SourceGraphic" result="r6"/><feOffset dx="25" dy="0" in="r6" result="r7"/><feGaussianBlur stdDeviation="5 0" in="r7" result="r8"/><feComposite operator="arithmetic" k1="0" k2="1" k3="1" k4="0" in="r8" in2="r11" result="r12"/><feComposite operator="arithmetic" k1="0" k2="1" k3="1" k4="0" in="r12" in2="r13"/></filter></svg>"#
+    );
+}

crates/svg-filters/src/tests/component_transfer.rs

@@ -0,0 +1,36 @@
+use crate::{
+    codegen::SvgDocument,
+    types::nodes::primitives::{
+        component_transfer::{ComponentTransfer, TransferFn},
+        FePrimitive,
+    },
+    Node,
+};
+
+#[test]
+fn test_comp_trans_simple() {
+    let mut doc = SvgDocument::new();
+
+    let comptrans = doc.create_filter("comp_trans");
+
+    comptrans.add_node(Node::simple(FePrimitive::ComponentTransfer(
+        ComponentTransfer {
+            func_r: TransferFn::Table {
+                table_values: vec![0., 0.1, 0.4, 0.9],
+            },
+            func_g: TransferFn::Discrete {
+                table_values: vec![0.1, 0.3, 0.5, 0.7, 0.9],
+            },
+            func_b: TransferFn::Linear {
+                slope: 1.0,
+                intercept: 0.75,
+            },
+            func_a: TransferFn::Identity,
+        },
+    )));
+
+    assert_eq!(
+        doc.generate_svg(),
+        r#"<svg><filter id="comp_trans"><feComponentTransfer><feFuncR type="table" tableValues="0 0.1 0.4 0.9"/><feFuncG type="discrete" tableValues="0.1 0.3 0.5 0.7 0.9"/><feFuncB type="linear" slope="1" intercept="0.75"/><feFuncA type="identity"/></feComponentTransfer></filter></svg>"#
+    );
+}

crates/svg-filters/src/tests/displacement_map.rs

@@ -0,0 +1,32 @@
+use crate::{
+    codegen::SvgDocument,
+    types::nodes::{
+        primitives::{
+            displacement_map::Channel,
+            turbulence::{NoiseType, StitchTiles},
+        },
+        standard_input::StandardInput,
+    },
+};
+
+#[test]
+fn test_displacement_map_simple() {
+    let mut doc = SvgDocument::new();
+
+    let displace = doc.create_filter("displace");
+
+    let simple_noise =
+        displace.turbulence(0.01, 0.01, 1, 0, StitchTiles::Stitch, NoiseType::Turbulence);
+    displace.displacement_map(
+        StandardInput::SourceGraphic,
+        simple_noise,
+        128.,
+        Channel::R,
+        Channel::R,
+    );
+
+    assert_eq!(
+        doc.generate_svg(),
+        r#"<svg><filter id="displace"><feTurbulence baseFrequency="0.01 0.01" stitchTiles="stitch" result="r6"/><feDisplacementMap scale="128" xChannelSelector="R" yChannelSelector="R" in="SourceGraphic" in2="r6"/></filter></svg>"#
+    );
+}

crates/svg-filters/src/tests/flood.rs

@@ -0,0 +1,17 @@
+use csscolorparser::Color;
+
+use crate::codegen::SvgDocument;
+
+#[test]
+fn test_flood_simple() {
+    let mut doc = SvgDocument::new();
+
+    let turbdispl = doc.create_filter("noiseDisplace");
+
+    turbdispl.flood(Color::new(0.9, 0.7, 0.85, 1.), 1.);
+
+    assert_eq!(
+        doc.generate_svg(),
+        r##"<svg><filter id="noiseDisplace"><feFlood flood-color="#e6b3d9" flood-opacity="1"/></filter></svg>"##
+    );
+}

crates/svg-filters/src/tests/gaussian_blur.rs

@@ -0,0 +1,13 @@
+use crate::{codegen::SvgDocument, types::nodes::standard_input::StandardInput};
+
+#[test]
+fn test_simple_blur() {
+    let mut doc = SvgDocument::new();
+    let blur = doc.create_filter("blur");
+
+    blur.gaussian_blur_xy(StandardInput::SourceGraphic, 30, 30);
+    assert_eq!(
+        doc.generate_svg(),
+        r#"<svg><filter id="blur"><feGaussianBlur stdDeviation="30 30" in="SourceGraphic"/></filter></svg>"#
+    );
+}

crates/svg-filters/src/tests/offset.rs

@@ -0,0 +1,14 @@
+use crate::{codegen::SvgDocument, types::nodes::standard_input::StandardInput};
+
+#[test]
+fn test_offset_simple() {
+    let mut doc = SvgDocument::new();
+    let offset = doc.create_filter("offset");
+
+    offset.offset(StandardInput::SourceGraphic, 25., -25.);
+
+    assert_eq!(
+        doc.generate_svg(),
+        r#"<svg><filter id="offset"><feOffset dx="25" dy="-25" in="SourceGraphic"/></filter></svg>"#
+    );
+}

crates/svg-filters/src/tests/turbulence.rs

@@ -0,0 +1,25 @@
+use crate::{
+    codegen::SvgDocument,
+    types::nodes::primitives::turbulence::{NoiseType, StitchTiles},
+};
+
+#[test]
+fn test_simple_turbulence() {
+    let mut doc = SvgDocument::new();
+
+    let noise = doc.create_filter("noise");
+
+    noise.turbulence(
+        0.01,
+        0.01,
+        1,
+        0,
+        StitchTiles::Stitch,
+        NoiseType::FractalNoise,
+    );
+
+    assert_eq!(
+        doc.generate_svg(),
+        r#"<svg><filter id="noise"><feTurbulence baseFrequency="0.01 0.01" stitchTiles="stitch" type="fractalNoise"/></filter></svg>"#
+    );
+}

crates/svg-filters/src/types.rs

@@ -0,0 +1,6 @@
+pub mod length;
+pub mod nodes;
+
+// pub mod old;
+
+pub mod graph;

crates/svg-filters/src/types/graph.rs

@@ -0,0 +1,143 @@
+use std::fmt::{Debug, Display};
+
+use petgraph::{prelude::NodeIndex, prelude::*};
+
+use crate::Node;
+
+use super::nodes::standard_input::StandardInput;
+
+#[derive(Debug)]
+pub struct FilterGraph {
+    pub dag: DiGraph<Node, ()>,
+    source_graphic_idx: NodeIndex,
+    source_alpha_idx: NodeIndex,
+    background_image_idx: NodeIndex,
+    background_alpha_idx: NodeIndex,
+    fill_paint_idx: NodeIndex,
+    stroke_paint_idx: NodeIndex,
+}
+
+impl Default for FilterGraph {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+#[derive(Debug, Clone, Copy)]
+pub enum NodeInput {
+    Standard(StandardInput),
+    Idx(NodeIndex),
+}
+
+impl Display for NodeInput {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            NodeInput::Standard(s) => Debug::fmt(s, f),
+            NodeInput::Idx(idx) => write!(f, "r{}", idx.index()),
+        }
+    }
+}
+
+impl From<StandardInput> for NodeInput {
+    fn from(value: StandardInput) -> Self {
+        Self::Standard(value)
+    }
+}
+
+impl From<NodeIndex> for NodeInput {
+    fn from(value: NodeIndex) -> Self {
+        Self::Idx(value)
+    }
+}
+
+impl FilterGraph {
+    pub fn new() -> Self {
+        let mut dag = DiGraph::new();
+
+        let source_graphic_idx = dag.add_node(Node::StdInput(StandardInput::SourceGraphic));
+        let source_alpha_idx = dag.add_node(Node::StdInput(StandardInput::SourceAlpha));
+        let background_image_idx = dag.add_node(Node::StdInput(StandardInput::BackgroundImage));
+        let background_alpha_idx = dag.add_node(Node::StdInput(StandardInput::BackgroundAlpha));
+        let fill_paint_idx = dag.add_node(Node::StdInput(StandardInput::FillPaint));
+        let stroke_paint_idx = dag.add_node(Node::StdInput(StandardInput::StrokePaint));
+
+        Self {
+            dag,
+            source_graphic_idx,
+            source_alpha_idx,
+            background_image_idx,
+            background_alpha_idx,
+            fill_paint_idx,
+            stroke_paint_idx,
+        }
+    }
+
+    pub fn add_node(&mut self, node: Node) -> NodeIndex {
+        self.dag.add_node(node)
+    }
+
+    fn resolve_input(&self, input: NodeInput) -> NodeIndex {
+        match input {
+            NodeInput::Standard(StandardInput::SourceGraphic) => self.source_graphic_idx,
+            NodeInput::Standard(StandardInput::SourceAlpha) => self.source_alpha_idx,
+            NodeInput::Standard(StandardInput::BackgroundImage) => self.background_image_idx,
+            NodeInput::Standard(StandardInput::BackgroundAlpha) => self.background_alpha_idx,
+            NodeInput::Standard(StandardInput::FillPaint) => self.fill_paint_idx,
+            NodeInput::Standard(StandardInput::StrokePaint) => self.stroke_paint_idx,
+            NodeInput::Idx(i) => i,
+        }
+    }
+
+    #[allow(
+        clippy::unwrap_used,
+        reason = "we only operate on values we know exist, so unwrapping is safe"
+    )]
+    pub fn inputs(&self, node_idx: NodeIndex) -> Vec<NodeInput> {
+        let mut inputs = self
+            .dag
+            .neighbors_directed(node_idx, Direction::Incoming)
+            .map(|input_idx| (self.dag.find_edge(input_idx, node_idx).unwrap(), input_idx))
+            .collect::<Vec<_>>();
+
+        inputs.sort_by(|(a, _), (b, _)| a.cmp(b));
+
+        inputs
+            .into_iter()
+            .map(
+                |(_, input_idx)| match self.dag.node_weight(input_idx).unwrap() {
+                    Node::StdInput(s) => NodeInput::Standard(*s),
+                    Node::Primitive { .. } => NodeInput::Idx(input_idx),
+                },
+            )
+            .collect()
+    }
+
+    pub fn outputs(&self, node_idx: NodeIndex) -> Vec<NodeIndex> {
+        self.dag
+            .neighbors_directed(node_idx, Direction::Outgoing)
+            .collect()
+    }
+
+    pub fn source_graphic(&self) -> NodeIndex {
+        self.source_graphic_idx
+    }
+    pub fn source_alpha(&self) -> NodeIndex {
+        self.source_alpha_idx
+    }
+    pub fn background_image(&self) -> NodeIndex {
+        self.background_image_idx
+    }
+    pub fn background_alpha(&self) -> NodeIndex {
+        self.background_alpha_idx
+    }
+    pub fn fill_paint(&self) -> NodeIndex {
+        self.fill_paint_idx
+    }
+    pub fn stroke_paint(&self) -> NodeIndex {
+        self.stroke_paint_idx
+    }
+}
+
+pub mod abstracted_inputs;
+
+pub mod edge;