allow top level module

README.md

@@ -5,7 +5,6 @@ An experimental statically-typed compiled programming language made with LLVM an
 Syntax is subject to change any time right now. It has a rusty style for now.
 
 ```rust
-mod Main {
 pub fn main() -> i32 {
     let b: i32 = factorial(4);
     return b;
@@ -18,7 +17,6 @@ mod Main {
         return n * factorial(n - 1);
     }
 }
-}
 ```
 
 ## edb: The edlang builder

edb/src/main.rs

@@ -114,30 +114,18 @@ fn main() -> Result<()> {
             if bin {
                 std::fs::write(
                     path.join("src").join("main.ed"),
-                    format!(
-                        r#"
-mod {} {{
-    pub fn main() -> i32 {{
+                    r#"pub fn main() -> i32 {{
     return 0;
-    }}
-}}"#,
-                        name
-                    ),
+}"#,
                 )?;
             }
 
             if lib {
                 std::fs::write(
                     path.join("src").join("lib.ed"),
-                    format!(
-                        r#"
-mod {} {{
-    pub fn hello_world() -> i32 {{
+                    r#"pub fn main() -> i32 {{
     return 0;
-    }}
-}}"#,
-                        name
-                    ),
+}"#,
                 )?;
             }
 

lib/edlang_driver/src/lib.rs

@@ -99,10 +99,13 @@ pub fn compile(args: &CompilerArgs) -> Result<PathBuf> {
     for path in files {
         let source = std::fs::read_to_string(&path)?;
 
-        let modules_ast = edlang_parser::parse_ast(&source);
+        let module_ast = edlang_parser::parse_ast(
+            &source,
+            &path.file_stem().expect("no file stem").to_string_lossy(),
+        );
 
-        let modules_temp = match modules_ast {
-            Ok(modules) => modules,
+        let module_temp = match module_ast {
+            Ok(module) => module,
             Err(error) => {
                 let path = path.display().to_string();
                 let report = edlang_parser::error_to_report(&path, &error)?;
@@ -110,7 +113,7 @@ pub fn compile(args: &CompilerArgs) -> Result<PathBuf> {
                 std::process::exit(1)
             }
         };
-        modules.push((path, source, modules_temp));
+        modules.push((path, source, module_temp));
     }
 
     let session = Session {

lib/edlang_driver/tests/common.rs

@@ -34,7 +34,7 @@ pub fn compile_program(
     name: &str,
     library: bool,
 ) -> Result<CompileResult, Box<dyn std::error::Error>> {
-    let modules = edlang_parser::parse_ast(source).unwrap();
+    let module = edlang_parser::parse_ast(source, name).unwrap();
 
     let test_dir = tempfile::tempdir().unwrap();
     let test_dir_path = test_dir.path().canonicalize()?;
@@ -61,7 +61,7 @@ pub fn compile_program(
         output_asm: false,
     };
 
-    let program_ir = lower_modules(&[modules]).unwrap();
+    let program_ir = lower_modules(&[module]).unwrap();
 
     let object_path = edlang_codegen_llvm::compile(&session, &program_ir).unwrap();
 

lib/edlang_ir/src/lib.rs

@@ -33,6 +33,7 @@ pub struct ProgramBody {
     pub structs: BTreeMap<DefId, AdtBody>,
     /// The function signatures.
     pub function_signatures: BTreeMap<DefId, (Vec<TypeInfo>, TypeInfo)>,
+    pub file_names: BTreeMap<usize, String>,
 }
 
 #[derive(Debug, Clone)]

lib/edlang_lowering/src/lib.rs

@@ -15,24 +15,19 @@ mod common;
 pub mod errors;
 mod prepass;
 
-pub fn lower_modules(modules: &[Vec<ast::Module>]) -> Result<ProgramBody, LoweringError> {
+pub fn lower_modules(modules: &[ast::Module]) -> Result<ProgramBody, LoweringError> {
     let mut ctx = BuildCtx::default();
 
     // resolve symbols
-    for (file_id, modules) in modules.iter().enumerate() {
-        for module in modules {
+    for (file_id, module) in modules.iter().enumerate() {
         ctx = prepass::prepass_module(ctx, module, file_id)?;
     }
-    }
 
     // resolve imports
-    for (file_id, modules) in modules.iter().enumerate() {
-        for module in modules {
+    for (file_id, module) in modules.iter().enumerate() {
         ctx = prepass::prepass_imports(ctx, module, file_id)?;
     }
-    }
 
-    for modules in modules {
     for mod_def in modules {
         let id = *ctx
             .body
@@ -42,7 +37,6 @@ pub fn lower_modules(modules: &[Vec<ast::Module>]) -> Result<ProgramBody, Loweri
 
         ctx = lower_module(ctx, mod_def, id)?;
     }
-    }
 
     Ok(ctx.body)
 }

lib/edlang_parser/src/grammar.lalrpop

@@ -3,7 +3,7 @@ use crate::lexer::LexicalError;
 use edlang_ast as ast;
 use std::str::FromStr;
 
-grammar;
+grammar<'module_name>(module_name: &'module_name str);
 
 extern {
   type Location = usize;
@@ -478,8 +478,16 @@ pub(crate) Import: ast::Import = {
     }
 }
 
-pub Modules: Vec<ast::Module> = {
-  <Module+> => <>
+pub TopLevelModule: ast::Module = {
+  <lo:@L> <imports:List<Import>?> <contents:List<ModuleStatement>> <hi:@R> => ast::Module {
+        name: ast::Ident {
+          name: module_name.to_string(),
+          span: ast::Span::new(0, 0),
+        },
+        imports: imports.unwrap_or(vec![]),
+        contents,
+        span: ast::Span::new(lo, hi),
+    }
 }
 
 pub Module: ast::Module = {

lib/edlang_parser/src/lib.rs

@@ -22,10 +22,11 @@ pub mod grammar {
 
 pub fn parse_ast(
     source: &str,
-) -> Result<Vec<edlang_ast::Module>, ParseError<usize, Token, LexicalError>> {
+    module_name: &str,
+) -> Result<edlang_ast::Module, ParseError<usize, Token, LexicalError>> {
     let lexer = Lexer::new(source);
-    let parser = grammar::ModulesParser::new();
-    parser.parse(lexer)
+    let parser = grammar::TopLevelModuleParser::new();
+    parser.parse(module_name, lexer)
 }
 
 pub fn print_report<'a>(