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feat(semantic): add scope tree to semantic analysis.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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@@ -4,3 +4,5 @@ mod debug; | |
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| pub use span::*; | ||
| pub use span_view::*; | ||
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| pub type ReferenceId = usize; | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,12 +1,135 @@ | ||
| use fuse_ast::Chunk; | ||
| use std::collections::HashMap; | ||
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| pub struct Semantic<'a> { | ||
| source: &'a str, | ||
| chunk: Chunk, | ||
| use fuse_ast::{ | ||
| walk_binding_pattern, walk_variable_declaration, Atom, BindingPattern, BindingPatternKind, | ||
| Chunk, Identifier, VariableDeclaration, Visitor, | ||
| }; | ||
| use fuse_common::ReferenceId; | ||
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| type ScopeId = ReferenceId; | ||
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| struct IdentifierMap(HashMap<Atom, ReferenceId>); | ||
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| impl IdentifierMap { | ||
| fn new() -> Self { | ||
| Self(HashMap::new()) | ||
| } | ||
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| fn insert(&mut self, atom: Atom, ref_id: ReferenceId) { | ||
| debug_assert!(!self.0.contains_key(&atom)); | ||
| self.0.insert(atom, ref_id); | ||
| } | ||
| } | ||
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| struct ScopeTree { | ||
| current: ScopeId, | ||
| identifier_maps: Vec<IdentifierMap>, | ||
| parent_ids: Vec<ScopeId>, | ||
| } | ||
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| impl ScopeTree { | ||
| fn root_scope() -> Self { | ||
| Self { | ||
| current: 0, | ||
| parent_ids: vec![0], | ||
| identifier_maps: vec![IdentifierMap::new()], | ||
| } | ||
| } | ||
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| fn push_stack(&mut self) -> ScopeId { | ||
| self.identifier_maps.push(IdentifierMap::new()); | ||
| self.parent_ids.push(self.current); | ||
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| let scope_id = self.identifier_maps.len() - 1; | ||
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| // length of all arrays should be same. | ||
| debug_assert!(self.identifier_maps.len() == self.parent_ids.len()); | ||
| self.current = scope_id; | ||
| scope_id | ||
| } | ||
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| fn pop_stack(&mut self) { | ||
| assert_ne!( | ||
| self.current, 0, | ||
| "Attempt to pop the root scope from the stack." | ||
| ); | ||
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| self.current = self.parent(); | ||
| } | ||
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| fn push_identifier(&mut self, atom: Atom, ref_id: ReferenceId) { | ||
| self.identifier_maps[self.current].insert(atom, ref_id); | ||
| } | ||
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| fn parent(&self) -> ScopeId { | ||
| assert_ne!( | ||
| self.current, 0, | ||
| "Attempt to access the root scope's parent." | ||
| ); | ||
| self.parent_ids[self.current] | ||
| } | ||
| } | ||
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| pub struct Semantic<'ast> { | ||
| source: &'ast str, | ||
| chunk: &'ast Chunk, | ||
| scope: ScopeTree, | ||
| last_reference: ReferenceId, | ||
| } | ||
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| impl<'ast> Semantic<'ast> { | ||
| pub fn new(source: &'ast str, chunk: &'ast Chunk) -> Self { | ||
| Self { | ||
| source, | ||
| chunk, | ||
| scope: ScopeTree::root_scope(), | ||
| last_reference: 0, | ||
| } | ||
| } | ||
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| pub fn build(mut self) { | ||
| self.visit_chunk(&self.chunk) | ||
| } | ||
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| fn reference_identifier(&mut self, ident: &Identifier) { | ||
| self.last_reference += 1; | ||
| self.scope | ||
| .push_identifier(ident.name.clone(), self.last_reference); | ||
| ident.reference.set(Some(self.last_reference)) | ||
| } | ||
| } | ||
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| impl<'a> Semantic<'a> { | ||
| pub fn new(source: &'a str, chunk: Chunk) -> Self { | ||
| Self { source, chunk } | ||
| impl<'ast> Visitor<'ast> for Semantic<'ast> { | ||
| fn enter_scope(&mut self) { | ||
| println!("IN"); | ||
| self.scope.push_stack(); | ||
| } | ||
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| fn leave_scope(&mut self) { | ||
| println!("OUT"); | ||
| self.scope.pop_stack(); | ||
| } | ||
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| fn visit_identifier(&mut self, ident: &Identifier) { | ||
| println!("{ident:?}") | ||
| } | ||
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| fn visit_variable_declaration(&mut self, decl: &'ast VariableDeclaration) { | ||
| match &decl.binding.kind { | ||
| BindingPatternKind::Identifier(bind) => self.reference_identifier(&bind.identifier), | ||
| _ => todo!(), | ||
| } | ||
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| walk_variable_declaration(self, decl) | ||
| } | ||
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| fn visit_binding_pattern(&mut self, pattern: &'ast BindingPattern) { | ||
| match &pattern.kind { | ||
| BindingPatternKind::Identifier(ident) => { | ||
| println!("{ident:?}") | ||
| } | ||
| _ => {} | ||
| } | ||
| walk_binding_pattern(self, pattern) | ||
| } | ||
| } |
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