Import type aliases

.vscode/launch.json

@@ -7,15 +7,15 @@
         {
             "type": "lldb",
             "request": "launch",
-            "name": "Debug shader_prepoc",
+            "name": "Debug wgsl_preprocessor",
             "cargo": {
                 "args": [
                     "build",
                     //"--manifest-path", "${workspaceFolder}/examples/testbed/Cargo.toml"
-                    "--bin=shader_prepoc",
+                    "--bin=wgsl_preprocessor",
                 ],
                 "filter": {
-                    "name": "shader_prepoc",
+                    "name": "wgsl_preprocessor",
                     "kind": "bin"
                 }
             },
@@ -25,33 +25,55 @@
         {
             "type": "lldb",
             "request": "launch",
-            "name": "Debug unit tests in executable 'shader_prepoc'",
+            "name": "Debug unit tests in executable 'wgsl_preprocessor'",
             "cargo": {
                 "args": [
                     "test",
                     "--no-run",
-                    "--bin=shader_prepoc",
+                    "--bin=wgsl_preprocessor",
-                    "--package=shader_prepoc"
+                    "--package=wgsl_preprocessor"
                 ],
                 "filter": {
-                    "name": "shader_prepoc",
+                    "name": "wgsl_preprocessor",
                     "kind": "bin"
                 }
             },
             "args": [],
             "cwd": "${workspaceFolder}"
         },
+        {
+            "type": "lldb",
+            "request": "launch",
+            "name": "Debug specific test in executable 'wgsl_preprocessor'",
+            "cargo": {
+                "args": [
+                    "test",
+                    "--no-run",
+                    "--lib",
+                    "--package=wgsl_preprocessor",
+                    "tests::import_struct_with_imported_fields",
+                    "--",
+                    "--exact --nocapture"
+                ],
+                "filter": {
+                    "name": "wgsl_preprocessor",
+                    "kind": "lib"
+                }
+            },
+            "args": [],
+            "cwd": "${workspaceFolder}"
+        },
         /* {
             "type": "lldb",
             "request": "launch",
-            "name": "Test shader_prepoc",
+            "name": "Test wgsl_preprocessor",
             "cargo": {
                 "args": [
                     "test",
-                    "--bin=shader_prepoc",
+                    "--bin=wgsl_preprocessor",
                 ],
                 "filter": {
-                    "name": "shader_prepoc",
+                    "name": "wgsl_preprocessor",
                     "kind": "bin"
                 }
             },

src/lib.rs

@@ -19,13 +19,13 @@ pub enum ExternalUsageType {
     Function,
 }
 
-#[derive(Clone)]
+#[derive(Clone, Debug)]
 pub struct Import {
     module: String,
     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`.
@@ -50,6 +51,8 @@ pub struct Module {
     src: String,
     /// 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
@@ -61,6 +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![];
@@ -137,6 +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");
@@ -150,7 +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!");
@@ -180,11 +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()
@@ -221,11 +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()
@@ -271,11 +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()
@@ -314,11 +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()
@@ -326,56 +345,138 @@ fn main() -> vec4<f32> {
         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();
+        let lights_mod = p.modules.get("engine::lights").unwrap();
+        assert!(lights_mod.structs.contains_key("Light"), "`Light` struct definition was not parsed");
 
+        let out = p.process_file(&importing_mod, &IMPORTING_MODULE).unwrap();
         assert!(out.contains("struct Light"), "missing `Light` struct definition: {}", out);
     }
 
-    /* #[test]
+    #[test]
-    fn import_type_aliases() {
+    fn import_struct_with_imported_fields() {
+        const TYPE_MODULE: &'static str =
+r#"#define_module engine::types
+
+struct Something {
+    val: f32
+}"#;
+
         const BINDINGS_MODULE: &'static str =
-r#"#define_module engine::aliases
+r#"#define_module engine::lights
+#import engine::types::{Something}
 
 struct Light {
+    some: Something,
     intensity: f32
-}
+}"#;
-
-struct Lights {
-    num: u32,
-    data: array<Light>
-}
-
-alias LightArray = Lights;"#;
 
         const IMPORTING_MODULE: &'static str =
 r#"#define_module engine::main
-#import engine::aliases::{LightArray}
+#import engine::lights::{Light}
-
-@group(0) @binding(0) var<uniform> lights: LightArray;
 
 fn main() -> vec4<f32> {
     // imports must be used to be generated
-    let light_num = lights.num;
+    let base_light = Light(1.0);
 
     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()
+            .expect("failed to find bindings module def");
         p.parse_module(BINDINGS_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();
+        let lights_mod = p.modules.get("engine::lights").unwrap();
+        assert!(lights_mod.structs.contains_key("Light"), "`Light` struct definition was not parsed");
 
-        assert!(out.contains("alias LightArray = Lights"), "missing use_anyway binding: {}", out);
+        let out = p.process_file(&importing_mod, &IMPORTING_MODULE).unwrap();
         assert!(out.contains("struct Light"), "missing `Light` struct definition: {}", out);
-        assert!(out.contains("struct Lights"), "missing `Lights` 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

@@ -63,6 +63,46 @@ pub enum PreprocessorError {
     ConflictingImport { from_module: String, name: String },
 }
 
+fn get_external_var_requirement(module: &Module, pair: Pair<Rule>) -> Option<DefRequirement> {
+    let var_name = pair.as_str();
+
+    if pair.as_rule() == Rule::shader_external_variable {
+        let (module_name, name) = var_name.rsplit_once("::").unwrap();
+
+        if RESERVED_WORDS.contains(&name) {
+            return None;
+        }
+
+        // Find the module that this variable is from.
+        // Starts by checking if the full module path was used.
+        // If it was not, then find the full path of the module.
+        let module_full_name = if module.module_imports.contains(module_name) {
+            Some(module_name.to_string())
+        } else {
+            module.module_imports.iter()
+                .find(|m| {
+                    m.ends_with(module_name)
+                }).cloned()
+        };
+
+        debug!("Binding module is {:?}", module_full_name);
+
+        Some(DefRequirement {
+            module: module_full_name,
+            name: name.to_string(),
+        })
+    } else { // The only possibility is `Rule::shader_type`
+        if RESERVED_WORDS.contains(&var_name) {
+            return None;
+        }
+
+        Some(DefRequirement {
+            module: None,
+            name: var_name.to_string(),
+        })
+    }
+}
+
 #[derive(Default)]
 pub struct Processor {
     pub modules: HashMap<String, Module>,
@@ -73,28 +113,6 @@ impl Processor {
         Self::default()
     }
 
-    // 
-    /* fn add_func_requirements(&self, found_requirements: &mut HashSet<String>, requirements: &mut Vec<DefRequirement>, fn_name: &str) {
-        if found_requirements.contains(fn_name) {
-            return;
-        }
-        found_requirements.insert(fn_name.to_string());
-
-        debug!("Found call to `{}`", fn_name);
-
-        // ignore reserved words
-        if RESERVED_WORDS.contains(&fn_name) {
-            return;
-        }
-
-        let req = DefRequirement {
-            // module is discovered later
-            module: None,
-            name: fn_name.to_string(),
-        };
-        requirements.push(req);
-    } */
-
     #[instrument(fields(module = module.name), skip_all)]
     fn get_imports_in_block(&mut self, module: &mut Module, block: Pair<Rule>, found_requirements: &mut HashSet<String>) -> Vec<DefRequirement> {
         let mut requirements = vec![];
@@ -407,6 +425,67 @@ impl Processor {
                                     _ => unimplemented!("ran into unhandled rule: {:?}", line.as_span())
                                 }
                             },
+                            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(_), 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();
+
+                                    match ty_inner.as_rule() {
+                                        Rule::shader_external_variable | Rule::shader_type => {
+                                            //requirements.push(value)
+                                            if let Some(req) = get_external_var_requirement(&module, ty_inner) {
+                                                requirements.push(req);
+                                            }
+                                        },
+                                        _ => unimplemented!("ran into unhandled rule: ({:?}) {:?}", line.as_rule(), line.as_span())
+                                    }
+                                }
+
+                                let sname = struct_name.as_str().to_string();
+                                let line_span = line.as_span();
+                                let start_pos = line_span.start();
+                                let end_pos = line_span.end();
+
+                                module.structs.insert(sname.clone(), Definition {
+                                    name: sname,
+                                    requirements,
+                                    start_pos,
+                                    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())
@@ -466,7 +545,8 @@ impl Processor {
         let module = self.modules.get(module_path).unwrap();
 
         let mut output = String::new();
-        compile_definitions(&self.modules, module, &mut output)?;
+        let mut compiled = HashSet::new();
+        compile_definitions(&self.modules, module, &mut compiled, &mut output)?;
         Ok(output)
     }
 
@@ -578,8 +658,14 @@ impl Processor {
 }
 
 fn try_find_requirement_module(module: &Module, req_name: &str) -> Option<String> {
+    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() {
+        //debug!("Import: {:?}", import);
+
         if import.imports.contains(&req_name.to_string()) {
+            //debug!("has it");
             return Some(import.module.clone());
         }
     }
@@ -587,35 +673,81 @@ fn try_find_requirement_module(module: &Module, req_name: &str) -> Option<String
     None
 }
 
-#[instrument(fields(module = module.name), skip_all)]
+//#[instrument(fields(module = module.name, require=tracing::field::Empty), skip_all)]
-fn compile_definitions(modules: &HashMap<String, Module>, module: &Module, output: &mut String) -> Result<(), PreprocessorError> {
+fn compile_definitions(modules: &HashMap<String, Module>, module: &Module, compiled_definitions: &mut HashSet<DefRequirement>, output: &mut String) -> Result<(), PreprocessorError> {
-    for (_, funcs) in &module.functions {
+    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()).chain(module.aliases.iter());
+    for (_, funcs) in defs { //&module.functions {
         let mut requirements = VecDeque::from(funcs.requirements.clone());
         
         while let Some(mut req) = requirements.pop_front() {
+            e.record("require", req.name.clone());
+            
             if req.module.is_none() {
                 let mod_name = try_find_requirement_module(&module, &req.name);
                 req.module = mod_name;
+                debug!("req module: {:?}", req.module);
             }
 
             if let Some(module_name) = &req.module {
                 let req_module = modules.get(module_name)
                     .unwrap_or_else(|| panic!("invalid module import: {}", module_name));
                 
-                let req_def = req_module.functions.get(&req.name)
+                // get the definition from the module that defines the import
-                    .or_else(|| req_module.vars.get(&req.name))
+                let req_def = req_module.get_definition(&req.name)
                     .unwrap_or_else(|| panic!("invalid import: {} from {}", req.name, module_name));
 
                 if !req_def.requirements.is_empty() {
-                    let sub_req_names: Vec<String> = req_def.requirements.iter().map(|r| r.name.clone()).collect();
+                    for mut sub in req_def.requirements.clone() {
-                    debug!("Found requirement: {}, with the following sub-requirements: {:?}", req_def.name, sub_req_names);
+                        e.record("sub_require", sub.name.clone());
+
+                        println!("searching for sub requirement module in module: '{}'", req_module.name);
+
+                        if sub.module.is_none() {
+                            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 mut requirements_output = String::new();
+                                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...");
+                            }
+                        } else {
+                            debug!("Requirement has no module, assuming its local...");
+                        }
+                    }
+                    /* 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, req_module, &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");
+                    output.push_str("\n"); */
                 }
 
                 let func_src = &req_module.src[req_def.start_pos..req_def.end_pos];

src/wgsl.pest

@@ -37,14 +37,14 @@ 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 ~
         ("," ~ NEWLINE ~ ws* ~ shader_ident ~ shader_var_type)* ~
-        ("," ~ NEWLINE)? ~ 
+        ","? ~ 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 = {