yet another attempt at building an evaluator

crates/executor-poc/Cargo.toml

@@ -4,6 +4,10 @@ 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

@@ -1,14 +1,128 @@
-pub fn add(left: usize, right: usize) -> usize {
-    left + right
+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>;
 }
 
-#[cfg(test)]
-mod tests {
-    use super::*;
+struct NodeGraph {
+    graph: DiGraph<Instruction, TypedEdge>,
+}
 
-    #[test]
-    fn it_works() {
-        let result = add(2, 2);
-        assert_eq!(result, 4);
+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,
+    // }
+}