Import type aliases

src/lib.rs

@@ -25,7 +25,7 @@ pub struct Import {
     imports: Vec<String>,
 }
 
-#[derive(Clone)]
+#[derive(Clone, PartialEq, Eq, Hash)]
 pub struct DefRequirement {
     /// None if the requirement is local
     module: Option<String>,
@@ -34,6 +34,7 @@ pub struct DefRequirement {
 
 #[derive(Clone)]
 pub struct Definition {
+    #[allow(dead_code)]
     name: String,
     requirements: Vec<DefRequirement>,
     /// The start byte position as a `usize`.
@@ -51,6 +52,7 @@ pub struct Module {
     /// Constants that this module defines
     pub vars: HashMap<String, Definition>,
     pub structs: HashMap<String, Definition>,
+    pub aliases: HashMap<String, Definition>,
     /// Functions that this module defines
     pub functions: HashMap<String, Definition>,
     /// Imports of things per module
@@ -62,6 +64,16 @@ pub struct Module {
     module_imports: HashSet<String>,
 }
 
+impl Module {
+    /// Get a definition of any type from this module.
+    pub fn get_definition(&self, name: &str) -> Option<&Definition> {
+        self.functions.get(name)
+            .or_else(|| self.vars.get(name))
+            .or_else(|| self.structs.get(name))
+            .or_else(|| self.aliases.get(name))
+    }
+}
+
 /// Recursively find files in `path`.
 pub(crate) fn recurse_files(path: impl AsRef<Path>) -> std::io::Result<Vec<PathBuf>> {
     let mut buf = vec![];
@@ -138,6 +150,12 @@ fn main() -> vec4<f32> {
     /// i.e., `simple::some_const`.
     #[test]
     fn double_layer_import_indirect_imports() {
+        /* tracing_subscriber::fmt()
+            // enable everything
+            .with_max_level(tracing::Level::TRACE)
+            // sets this to be the default, global collector for this application.
+            .init(); */
+
         let mut p = Processor::new();
         p.parse_module(&INNER_MODULE).unwrap()
             .expect("failed to find module");
@@ -151,7 +169,7 @@ fn main() -> vec4<f32> {
         assert!(out.contains("const simple_scalar"), "definition of imported `const simple_scalar` is missing!");
         assert!(out.contains("fn do_something_cool("), "definition of imported `fn do_something_cool` is missing!");
 
-        assert!(out.contains("const scalar"), "definition of imported dependency, `const scalar` is missing!");
+        assert!(out.contains("const scalar"), "definition of imported dependency, `const scalar` is missing! {}", out);
         assert!(out.contains("fn mult_some_nums("), "definition of imported dependency, `fn mult_some_nums` is missing!");
 
         assert!(out.contains("fn do_something_cool("), "definition of imported `fn do_something_cool` is missing!");
@@ -181,11 +199,11 @@ fn main() -> vec4<f32> {
     return vec4<f32>(1.0);
 }"#;
 
-        tracing_subscriber::fmt()
+        /* tracing_subscriber::fmt()
             // enable everything
             .with_max_level(tracing::Level::TRACE)
             // sets this to be the default, global collector for this application.
-            .init();
+            .init(); */
 
         let mut p = Processor::new();
         p.parse_module(BINDINGS_MODULE).unwrap()
@@ -222,11 +240,11 @@ fn main() -> vec4<f32> {
     return vec4<f32>(1.0);
 }"#;
 
-        tracing_subscriber::fmt()
+        /* tracing_subscriber::fmt()
             // enable everything
             .with_max_level(tracing::Level::TRACE)
             // sets this to be the default, global collector for this application.
-            .init();
+            .init(); */
 
         let mut p = Processor::new();
         p.parse_module(BINDINGS_MODULE).unwrap()
@@ -272,11 +290,11 @@ fn main() -> vec4<f32> {
     return vec4<f32>(1.0);
 }"#;
 
-        tracing_subscriber::fmt()
+        /* tracing_subscriber::fmt()
             // enable everything
             .with_max_level(tracing::Level::TRACE)
             // sets this to be the default, global collector for this application.
-            .init();
+            .init(); */
 
         let mut p = Processor::new();
         p.parse_module(BINDINGS_MODULE).unwrap()
@@ -315,11 +333,11 @@ fn main() -> vec4<f32> {
     return vec4<f32>(1.0);
 }"#;
 
-        tracing_subscriber::fmt()
+        /* tracing_subscriber::fmt()
             // enable everything
             .with_max_level(tracing::Level::TRACE)
             // sets this to be the default, global collector for this application.
-            .init();
+            .init(); */
 
         let mut p = Processor::new();
         p.parse_module(BINDINGS_MODULE).unwrap()
@@ -363,11 +381,11 @@ fn main() -> vec4<f32> {
     return vec4<f32>(1.0);
 }"#;
 
-        tracing_subscriber::fmt()
+        /* tracing_subscriber::fmt()
             // enable everything
             .with_max_level(tracing::Level::TRACE)
             // sets this to be the default, global collector for this application.
-            .init();
+            .init(); */
 
         let mut p = Processor::new();
         p.parse_module(TYPE_MODULE).unwrap()
@@ -384,4 +402,81 @@ fn main() -> vec4<f32> {
         assert!(out.contains("struct Light"), "missing `Light` struct definition: {}", out);
         assert!(out.contains("struct Something"), "missing `Something` struct definition: {}", out);
     }
+
+    #[test]
+    fn import_type_alias() {
+        const TYPE_MODULE: &'static str =
+r#"#define_module engine::types
+
+alias LightIntensity = f32;"#;
+
+        const IMPORTING_MODULE: &'static str =
+r#"#define_module engine::main
+#import engine::types::{LightIntensity}
+
+fn main() -> vec4<f32> {
+    // imports must be used to be generated
+    let intensity: LightIntensity = 1.0;
+
+    return vec4<f32>(1.0);
+}"#;
+
+        /* tracing_subscriber::fmt()
+            // enable everything
+            .with_max_level(tracing::Level::TRACE)
+            // sets this to be the default, global collector for this application.
+            .init(); */
+
+        let mut p = Processor::new();
+        p.parse_module(TYPE_MODULE).unwrap()
+            .expect("failed to find bindings module def");
+        let importing_mod = p.parse_module(IMPORTING_MODULE).unwrap()
+            .expect("failed to find main module def");
+
+        let out = p.process_file(&importing_mod, &IMPORTING_MODULE).unwrap();
+        assert!(out.contains("alias LightIntensity"), "missing `LightIntensity` type alias: {}", out);
+    }
+
+    #[test]
+    fn import_type_alias_with_imports() {
+        const TYPE_MODULE: &'static str =
+r#"#define_module engine::types
+
+alias Number = f32;"#;
+
+        const LIGHT_MODULE: &'static str =
+r#"#define_module engine::light
+#import engine::types::{Number}
+
+alias LightIntensity = Number;"#;
+
+        const IMPORTING_MODULE: &'static str =
+r#"#define_module engine::main
+#import engine::light::{LightIntensity}
+
+fn main() -> vec4<f32> {
+    // imports must be used to be generated
+    let intensity: LightIntensity = 1.0;
+
+    return vec4<f32>(1.0);
+}"#;
+
+        /* tracing_subscriber::fmt()
+            // enable everything
+            .with_max_level(tracing::Level::TRACE)
+            // sets this to be the default, global collector for this application.
+            .init(); */
+
+        let mut p = Processor::new();
+        p.parse_module(TYPE_MODULE).unwrap()
+            .expect("failed to find bindings module def");
+        p.parse_module(LIGHT_MODULE).unwrap()
+            .expect("failed to find bindings module def");
+        let importing_mod = p.parse_module(IMPORTING_MODULE).unwrap()
+            .expect("failed to find main module def");
+
+        let out = p.process_file(&importing_mod, &IMPORTING_MODULE).unwrap();
+        assert!(out.contains("alias LightIntensity"), "missing `LightIntensity` type alias: {}", out);
+        assert!(out.contains("alias Number"), "missing `Number` type alias: {}", out);
+    }
 }

src/preprocessor.rs

@@ -427,11 +427,11 @@ impl Processor {
                             },
                             Rule::shader_struct_def => {
                                 let mut struct_inner = line.clone().into_inner();
-
                                 let struct_name = struct_inner.next().unwrap();
 
+                                // iterate through fields in struct
                                 let mut requirements = vec![];
-                                while let (Some(ident), Some(field_ty)) = (struct_inner.next(), struct_inner.next()) {
+                                while let (Some(_), Some(field_ty)) = (struct_inner.next(), struct_inner.next()) {
                                     //panic!("got {} of type {}", ident.as_str(), field_ty.as_str());
                                     let mut ty_inner = field_ty.into_inner();
                                     let ty_inner = ty_inner.next().unwrap();
@@ -459,6 +459,33 @@ impl Processor {
                                     end_pos,
                                 });
                             },
+                            Rule::shader_type_alias_def => {
+                                let mut inner = line.clone().into_inner();
+
+                                // get rules
+                                let alias_name = inner.next().unwrap();
+                                let alias_to = inner.next().unwrap();
+
+                                // get the requirements of the alias if there are any
+                                let requirements = if let Some(req) = get_external_var_requirement(&module, alias_to) {
+                                    debug!("Type req: {}", req.name);
+                                    vec![req]
+                                } else { vec![] };
+
+                                let aname = alias_name.as_str().to_string();
+                                debug!("Type alias `{}`", aname);
+
+                                let line_span = line.as_span();
+                                let start_pos = line_span.start();
+                                let end_pos = line_span.end();
+
+                                module.aliases.insert(aname.clone(), Definition {
+                                    name: aname,
+                                    requirements,
+                                    start_pos,
+                                    end_pos,
+                                });
+                            },
                             Rule::cws => (),
                             Rule::newline => (),
                             _ => unimplemented!("ran into unhandled rule: ({:?}) {:?}", line.as_rule(), line.as_span())
@@ -631,7 +658,7 @@ impl Processor {
 }
 
 fn try_find_requirement_module(module: &Module, req_name: &str) -> Option<String> {
-    //debug!("imports: {:?}", module.item_imports.values());
+    debug!("looking for '{}' in module '{}' that imports: {:?}", req_name, module.name, module.item_imports.values());
     //debug!("Module: {}, req: {}", module.name, req_name);
 
     for import in module.item_imports.values() {
@@ -647,10 +674,10 @@ fn try_find_requirement_module(module: &Module, req_name: &str) -> Option<String
 }
 
 //#[instrument(fields(module = module.name, require=tracing::field::Empty), skip_all)]
-fn compile_definitions(modules: &HashMap<String, Module>, module: &Module, compiled_modules: &mut HashSet<String>, output: &mut String) -> Result<(), PreprocessorError> {
+fn compile_definitions(modules: &HashMap<String, Module>, module: &Module, compiled_definitions: &mut HashSet<DefRequirement>, output: &mut String) -> Result<(), PreprocessorError> {
-    let e = debug_span!("compile_definitions", module = module.name, require = tracing::field::Empty).entered();
+    let e = debug_span!("compile_definitions", module = module.name, require = tracing::field::Empty, sub_require = tracing::field::Empty).entered();
 
-    let defs = module.functions.iter().chain(module.vars.iter()).chain(module.structs.iter());
+    let defs = module.functions.iter().chain(module.vars.iter()).chain(module.structs.iter()).chain(module.aliases.iter());
     for (_, funcs) in defs { //&module.functions {
         let mut requirements = VecDeque::from(funcs.requirements.clone());
         
@@ -668,34 +695,43 @@ fn compile_definitions(modules: &HashMap<String, Module>, module: &Module, compi
                     .unwrap_or_else(|| panic!("invalid module import: {}", module_name));
                 
                 // get the definition from the module that defines the import
-                let req_def = req_module.functions.get(&req.name)
+                let req_def = req_module.get_definition(&req.name)
-                    .or_else(|| req_module.vars.get(&req.name))
-                    .or_else(|| req_module.structs.get(&req.name))
                     .unwrap_or_else(|| panic!("invalid import: {} from {}", req.name, module_name));
 
-
                 if !req_def.requirements.is_empty() {
-                    for sub in &req_def.requirements {
+                    for mut sub in req_def.requirements.clone() {
-                        let sub_module = sub.module.clone().or_else(|| try_find_requirement_module(&module, &req.name));
+                        e.record("sub_require", sub.name.clone());
-                        
+
-                        if let Some(sub_mod) = &sub_module {
+                        println!("searching for sub requirement module in module: '{}'", req_module.name);
-                            if !compiled_modules.contains(sub_mod) {
+
-                                //panic!("NEED TO COMPILE");
+                        if sub.module.is_none() {
-                                compiled_modules.insert(sub_mod.clone());
+                            sub.module = try_find_requirement_module(&req_module, &sub.name);
+                        }
+
+                        if let Some(sub_mod) = &sub.module {
+                            if !compiled_definitions.contains(&sub) {
+                                compiled_definitions.insert(sub.clone());
 
                                 let sub_mod = modules.get(sub_mod).expect("unknown module from import");
                                 debug!("found sub requirement module: {}", sub_mod.name);
                                 let module_name = &sub_mod.name;
 
-                                /* let sub_req_names: Vec<String> = req_def.requirements.iter().map(|r| r.name.clone()).collect();
-                                debug!("Found requirement: {}, with the following sub-requirements: {:?} from {}", req_def.name, sub_req_names, req_module.name); */
-
                                 let mut requirements_output = String::new();
-                                compile_definitions(modules, sub_mod, compiled_modules, &mut requirements_output)?;
+                                compile_definitions(modules, sub_mod, compiled_definitions, &mut requirements_output)?;
                                 
                                 output.write_fmt(format_args!("\n// REQUIREMENTS OF {}::{}\n", module_name, req.name))?;
                                 output.push_str(&requirements_output);
                                 output.push_str("\n");
+
+                                // find the definition of the sub requirement
+                                let sub_def = sub_mod.get_definition(&sub.name)
+                                    .unwrap_or_else(|| panic!("invalid import: {} from {}", req.name, module_name));
+
+                                // write the source of the sub requirement to the output
+                                let req_src = &sub_mod.src[sub_def.start_pos..sub_def.end_pos];
+                                output.write_fmt(format_args!("// SOURCE {}::{}\n", module_name, sub.name))?;
+                                output.push_str(req_src);
+                                output.push_str("\n");
                             } else {
                                 debug!("Requirement module is already compiled, skipping...");
                             }

src/wgsl.pest

@@ -37,6 +37,7 @@ shader_value = { shader_value_bool | shader_value_num  }
 
 shader_var_type = { ":" ~ ws* ~ (shader_external_variable | shader_type) }
 shader_const_def = { "const" ~ ws ~ shader_ident ~ (ws* ~ shader_var_type)? ~ ws* ~ "=" ~ ws* ~ shader_value ~ ";" }
+shader_type_alias_def = { ("alias" | "type") ~ ws ~ shader_ident ~ ws* ~ "=" ~ ws* ~ (shader_external_variable | shader_type) ~ ";" }
 shader_struct_def = {
     "struct" ~ ws ~ shader_ident ~ ws* ~ "{" ~ NEWLINE ~
         ws* ~ shader_ident ~ shader_var_type ~
@@ -44,7 +45,6 @@ shader_struct_def = {
         ","? ~ NEWLINE? ~ 
     "}"
 }
-shader_type_alias_def = { "alias" ~ ws ~ shader_ident ~ ws* ~ "=" ~ ws* ~ (shader_external_variable | shader_type) ~ ";" }
 
 shader_group_binding = { "@group(" ~ NUMBER ~ ") @binding(" ~ NUMBER ~ ")" }
 shader_binding_var_constraint = {