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Add types necessary for refactor of Symbol table

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This commit is contained in:
greg 2019-03-11 01:36:11 -07:00
parent d4ad97b39a
commit 2490aaf3f4
1 changed files with 19 additions and 9 deletions
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28
schala-lang/language/src/symbol_table.rs
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@ -13,14 +13,23 @@ type LineNumber = u32;
type SymbolTrackTable = HashMap<Rc<String>, LineNumber>;
#[derive(PartialEq, Eq, Hash, Debug)]
struct SymbolPath {
name: Rc<String>,
enclosing_scopes: Vec<Rc<String>>
struct PathToSymbol(Vec<Rc<String>>);
#[derive(Debug)]
struct SymbolPathSegment {
segment_name: Rc<String>,
segment_type: SymbolPathSegmentKind
}
#[derive(Debug)]
enum SymbolPathSegmentKind {
NamedScope,
TypeVariant
}
//cf. p. 150 or so of Language Implementation Patterns
pub struct SymbolTable {
values: HashMap<SymbolPath, Symbol>,
values: HashMap<PathToSymbol, Symbol>,
}
//TODO add various types of lookups here, maybe multiple hash tables internally?
@ -32,10 +41,9 @@ impl SymbolTable {
}
fn add_new_symbol(&mut self, name: &Rc<String>, path: &Vec<Rc<String>>, symbol: Symbol) {
let symbol_path = SymbolPath {
name: name.clone(),
enclosing_scopes: path.clone(),
};
let mut vec = path.clone();
vec.push(name.clone());
let symbol_path = PathToSymbol(vec);
self.values.insert(symbol_path, symbol);
}
@ -44,7 +52,9 @@ impl SymbolTable {
}
pub fn lookup_by_path(&self, name: &Rc<String>, path: &Vec<Rc<String>>) -> Option<&Symbol> {
let symbol_path = SymbolPath { name: name.clone(), enclosing_scopes: path.clone() };
let mut vec = path.clone();
vec.push(name.clone());
let symbol_path = PathToSymbol(vec);
self.values.get(&symbol_path)
}
}