feat(ir): implement resolve functionality (untested)

crates/ir/src/instruction/mod.rs

@@ -3,8 +3,10 @@ use serde::{Deserialize, Serialize};
 pub mod read;
 pub mod write;
 
-#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+#[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),
@@ -13,7 +15,7 @@ pub enum Kind {
     Filter(Filter),
 }
 
-#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
 pub enum Math {
     Add,
     Subtract,
@@ -21,7 +23,7 @@ pub enum Math {
     Divide,
 }
 
-#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
 pub enum Blend {
     Normal,
     Multiply,
@@ -34,14 +36,46 @@ pub enum Blend {
     Lighten,
 }
 
-#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
 pub enum Noise {
     Perlin,
     Simplex,
     Voronoi,
 }
 
-#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+#[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

@@ -1,18 +1,18 @@
 use serde::{Deserialize, Serialize};
 use std::path::PathBuf;
 
-#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
 pub struct Read {
     pub source: SourceType,
     pub format: SourceFormat,
 }
 
-#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
 pub enum SourceType {
     File(PathBuf),
 }
 
-#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
 pub enum SourceFormat {
     Jpeg,
     Png,

crates/ir/src/instruction/write.rs

@@ -1,18 +1,18 @@
 use serde::{Deserialize, Serialize};
 use std::path::PathBuf;
 
-#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
 pub struct Write {
     pub target: TargetType,
     pub format: TargetFormat,
 }
 
-#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
 pub enum TargetType {
     File(PathBuf),
 }
 
-#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
 pub enum TargetFormat {
     Jpeg,
     Png,