add error reporting stuffs

Cargo.lock

@@ -171,6 +171,16 @@ dependencies = [
  "cc",
 ]
 
+[[package]]
+name = "codespan-reporting"
+version = "0.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3538270d33cc669650c4b093848450d380def10c331d38c768e34cac80576e6e"
+dependencies = [
+ "termcolor",
+ "unicode-width",
+]
+
 [[package]]
 name = "colorchoice"
 version = "1.0.0"
@@ -1112,6 +1122,12 @@ version = "1.10.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1dd624098567895118886609431a7c3b8f516e41d30e0643f03d94592a147e36"
 
+[[package]]
+name = "unicode-width"
+version = "0.1.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e51733f11c9c4f72aa0c160008246859e340b00807569a0da0e7a1079b27ba85"
+
 [[package]]
 name = "utf8parse"
 version = "0.2.1"
@@ -1145,6 +1161,7 @@ name = "webthing"
 version = "0.1.0"
 dependencies = [
  "clap",
+ "codespan-reporting",
  "cosmic-text",
  "env_logger",
  "font-kit",

Cargo.toml

@@ -14,3 +14,4 @@ font-kit = { version = "0.11", features = [ "loader-freetype" ]}
 simple_logger = "4.3.3"
 logos = "0.13.0"
 cosmic-text = "0.10.0"
+codespan-reporting = "0.11.1"

example.hswt

@@ -15,3 +15,4 @@ more text
 (heading level=2 "heading level 2 too")
 
 (heading level=3 "heading level 3 too")
+

src/error.rs

@@ -0,0 +1,159 @@
+use std::{collections::HashMap, ops::Range, process};
+
+use codespan_reporting::{
+    diagnostic::{Diagnostic, Label, Severity},
+    files::SimpleFiles,
+    term::{
+        self,
+        termcolor::{ColorChoice, StandardStream},
+    },
+};
+
+pub type Span = Range<usize>;
+
+type FileId = usize;
+
+#[derive(PartialEq, Eq, Hash, Copy, Clone)]
+pub struct FileIdent<'a> {
+    id: FileId,
+    name: &'a str,
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub enum DiagnosticKind {
+    InvalidToken,
+}
+
+pub enum DiagCriticality {
+    /// Bugs in this program, unreachable code being reached, etc.
+    Bug,
+
+    // TODO: Better names
+    /// Critical errors that cannot be recovered from, prompt immediate exit
+    CriticalImmediate,
+    /// Critical, this program must exit after this processing step, but can continue and may find other diagnostics
+    CriticalFinishStep,
+
+    /// A warning, about to be deprecated syntax etc.
+    Warn,
+
+    /// Information/advice
+    Info,
+    Help,
+}
+
+impl DiagCriticality {
+    fn mk_diag_base(&self) -> Diagnostic<FileId> {
+        Diagnostic::new(match self {
+            DiagCriticality::Bug => Severity::Bug,
+            DiagCriticality::CriticalImmediate => Severity::Error,
+            DiagCriticality::CriticalFinishStep => Severity::Error,
+            DiagCriticality::Warn => Severity::Warning,
+            DiagCriticality::Info => Severity::Note,
+            DiagCriticality::Help => Severity::Help,
+        })
+    }
+}
+
+impl DiagnosticKind {
+    pub fn criticality(&self) -> DiagCriticality {
+        match self {
+            DiagnosticKind::InvalidToken => DiagCriticality::CriticalFinishStep,
+        }
+    }
+
+    fn into_diag(self, locs: &[Span], file_id: &FileIdent) -> Diagnostic<FileId> {
+        self.criticality()
+            .mk_diag_base()
+            .with_labels(
+                locs.iter()
+                    .map(|span| Label::primary(file_id.id, span.clone()))
+                    .collect(),
+            )
+            .with_message(match self {
+                DiagnosticKind::InvalidToken => {
+                    if locs.len() > 1 {
+                        "invalid tokens"
+                    } else {
+                        "invalid token"
+                    }
+                }
+            })
+    }
+}
+
+pub struct DiagnosticReporter<'a> {
+    files: SimpleFiles<&'a str, &'a str>,
+    errs: HashMap<FileIdent<'a>, HashMap<DiagnosticKind, Vec<Span>>>,
+}
+
+impl<'a> DiagnosticReporter<'a> {
+    pub fn new() -> Self {
+        Self {
+            files: SimpleFiles::new(),
+            errs: HashMap::new(),
+        }
+    }
+
+    pub fn register_file(&mut self, name: &'a str, content: &'a str) -> FileIdent<'a> {
+        FileIdent {
+            id: self.files.add(name, content),
+            name,
+        }
+    }
+
+    pub fn report_diagnostic(&mut self, file_id: FileIdent<'a>, loc: Span, kind: DiagnosticKind) {
+        self.errs
+            .entry(file_id)
+            .or_insert_with(|| HashMap::with_capacity(1));
+
+        if !self.errs[&file_id].contains_key(&kind) {
+            self.errs.get_mut(&file_id).unwrap().insert(kind, vec![loc]);
+        } else {
+            self.errs
+                .get_mut(&file_id)
+                .unwrap()
+                .get_mut(&kind)
+                .unwrap()
+                .push(loc)
+        }
+
+        match kind.criticality() {
+            DiagCriticality::Bug | DiagCriticality::CriticalImmediate => self.finish_and_exit(),
+            DiagCriticality::CriticalFinishStep
+            | DiagCriticality::Warn
+            | DiagCriticality::Info
+            | DiagCriticality::Help => {}
+        }
+    }
+
+    pub fn fail_step_if_failed(&self) {
+        for (_, diags) in self.errs.iter() {
+            for kind in diags.keys() {
+                if matches!(
+                    kind.criticality(),
+                    DiagCriticality::Bug
+                        | DiagCriticality::CriticalImmediate
+                        | DiagCriticality::CriticalFinishStep
+                ) {
+                    self.finish_and_exit()
+                }
+            }
+        }
+    }
+
+    fn finish_and_exit(&self) -> ! {
+        let writer = StandardStream::stderr(ColorChoice::Always);
+        let config = term::Config::default();
+
+        for (file_id, diags) in self.errs.iter() {
+            for (kind, locs) in diags {
+                let writer = &mut writer.lock();
+                term::emit(writer, &config, &self.files, &kind.into_diag(locs, file_id))
+                    .expect("can't even report errors :c");
+            }
+        }
+
+        process::exit(1);
+    }
+}

src/main.rs

@@ -11,6 +11,9 @@ use parse::parse_the_shit_out_of_this_but_manually;
 
 use render::render_text;
 
+use crate::error::DiagnosticReporter;
+
+mod error;
 mod parse;
 mod render;
 
@@ -34,9 +37,17 @@ fn main() {
         args.x, args.y
     );
 
-    let txt = fs::read_to_string(args.file).unwrap();
+    let mut reporter = DiagnosticReporter::new();
 
-    dbg!(parse_the_shit_out_of_this_but_manually(&txt));
+    let txt = fs::read_to_string(args.file.clone()).unwrap();
+
+    let fid = reporter.register_file(args.file.file_name().unwrap().to_str().unwrap(), &txt);
+
+    dbg!(parse_the_shit_out_of_this_but_manually(
+        &txt,
+        &mut reporter,
+        &fid
+    ));
 
     let mut dt = DrawTarget::new(args.x.into(), args.y.into());
 

src/parse.rs

@@ -2,9 +2,11 @@ use std::collections::HashMap;
 
 use logos::{Lexer, Logos};
 
+use crate::error::{DiagnosticKind, DiagnosticReporter, FileIdent};
+
 #[derive(Logos, Debug, PartialEq)]
 pub enum Token {
-    #[regex("[a-zA-Z\\d\\w]+", |lex| lex.slice().to_owned())]
+    #[regex("[a-zA-Z\\d\\s]+", |lex| lex.slice().to_owned())]
     Text(String),
     #[token("(")]
     ParenOpen,
@@ -40,35 +42,45 @@ pub enum LanguageStructureThingy {
     },
 }
 
-pub fn parse_the_shit_out_of_this_but_manually(text: &str) -> Vec<LanguageStructureThingy> {
-    let mut lex = Token::lexer(text);
+pub fn parse_the_shit_out_of_this_but_manually<'a>(
+    text: &str,
+    reporter: &mut DiagnosticReporter<'a>,
+    file_id: &'a FileIdent,
+) -> Vec<LanguageStructureThingy> {
+    let mut lex = Token::lexer(text).spanned();
     let mut r = Vec::new();
 
-    loop {
-        match lex.next() {
-            Some(Ok(Token::Text(s))) => r.push(LanguageStructureThingy::Text(s)),
-            Some(Ok(Token::Newline)) => r.push(LanguageStructureThingy::Text("\n".to_owned())),
-            Some(Ok(Token::ParenOpen)) => hehe_sexpression_funy(&mut r, &mut lex),
-            Some(Ok(Token::ParenClose)) => todo!(),
-            Some(Ok(Token::String(_))) => todo!(),
-            Some(Ok(Token::Equals)) => todo!(),
-            Some(Ok(Token::Asterisk)) => todo!(),
-            Some(Ok(Token::Underscore)) => todo!(),
-            Some(Ok(Token::Backslash)) => todo!(),
-            Some(Ok(Token::WavyThing)) => todo!(),
-            Some(Ok(Token::Sparkles)) => todo!(),
-            Some(Ok(Token::HeadingLevelIndicator)) => todo!(),
-            Some(Err(e)) => panic!("mauuu~ :(, e: {e:?}"),
-            None => break,
+    while let Some((res, loc)) = lex.next() {
+        match res {
+            Ok(Token::Text(s)) => r.push(LanguageStructureThingy::Text(s)),
+            Ok(Token::Newline) => r.push(LanguageStructureThingy::Text("\n".to_owned())),
+            Ok(Token::ParenOpen) => hehe_sexpression_funy(&mut r, &mut lex),
+            Ok(Token::String(_)) => todo!(),
+            Ok(Token::Equals) => todo!(),
+            Ok(Token::Asterisk) => todo!(),
+            Ok(Token::Underscore) => todo!(),
+            Ok(Token::Backslash) => todo!(),
+            Ok(Token::WavyThing) => todo!(),
+            Ok(Token::Sparkles) => todo!(),
+            Ok(Token::HeadingLevelIndicator) => todo!(),
+            Err(()) | Ok(Token::ParenClose) => {
+                reporter.report_diagnostic(*file_id, loc, DiagnosticKind::InvalidToken)
+            }
         }
     }
 
+    reporter.fail_step_if_failed();
+    // match lex.next() {
+    //     Some(Err(e)) => panic!("mauuu~ :(, e: {e:?}"),
+    //     None => break,
+    // }
+
     r
 }
 
 fn hehe_sexpression_funy(r: &mut Vec<LanguageStructureThingy>, lex: &mut Lexer<'_, Token>) {
     if let Some(Ok(Token::Text(s))) = lex.next() {
-        let strs = s.trim_start().split_whitespace().collect::<Vec<&str>>();
+        let strs = s.split_whitespace().collect::<Vec<&str>>();
 
         let name = strs[0].to_owned();
         let mut attrs = HashMap::new();