Modify Symbol struct

schala-lang/language/src/reduced_ir/mod.rs

@@ -1,5 +1,5 @@
 use crate::ast;
-use crate::symbol_table::{DefId, Symbol, SymbolSpec, SymbolTable};
+use crate::symbol_table::{DefId, SymbolSpec, SymbolTable};
 use crate::builtin::Builtin;
 
 use std::str::FromStr;
@@ -46,7 +46,8 @@ impl<'a> Reducer<'a> {
                 },
                 ast::StatementKind::Declaration(ast::Declaration::Binding { name: _, constant, expr, ..}) => {
                     let symbol = self.symbol_table.lookup_symbol(item_id).unwrap();
-                    entrypoint.push(Statement::Binding { id: symbol.def_id.clone(), constant: *constant, expr: self.expression(&expr) });
+                    let def_id = symbol.def_id().unwrap();
+                    entrypoint.push(Statement::Binding { id: def_id, constant: *constant, expr: self.expression(&expr) });
                 },
                 _ => ()
             }
@@ -93,7 +94,8 @@ impl<'a> Reducer<'a> {
                 },
                 ast::Declaration::Binding { constant, expr, ..} => {
                     let symbol = self.symbol_table.lookup_symbol(item_id).unwrap();
-                    Some(Statement::Binding { id: symbol.def_id.clone(), constant: *constant, expr: self.expression(&expr) })
+                    let def_id = symbol.def_id().unwrap();
+                    Some(Statement::Binding { id: def_id, constant: *constant, expr: self.expression(&expr) })
                 },
 
                 _ => None
@@ -104,7 +106,7 @@ impl<'a> Reducer<'a> {
 
     fn insert_function_definition(&mut self, item_id: &ast::ItemId, statements: &ast::Block) {
         let symbol = self.symbol_table.lookup_symbol(item_id).unwrap();
-        let def_id = symbol.def_id.clone();
+        let def_id = symbol.def_id().unwrap();
         let function_def = FunctionDefinition {
             body: self.function(statements)
         };
@@ -185,8 +187,8 @@ impl<'a> Reducer<'a> {
             Some(Builtin::Assignment) => {
                 let lval = match &lhs.kind {
                     ast::ExpressionKind::Value(qualified_name) => {
-                        if let Some(Symbol { def_id, .. }) = self.symbol_table.lookup_symbol(&qualified_name.id) {
-                            def_id.clone()
+                        if let Some(symbol) = self.symbol_table.lookup_symbol(&qualified_name.id) {
+                            symbol.def_id().unwrap()
                         } else {
                             return ReductionError(format!("Couldn't look up name: {:?}", qualified_name));
                         }
@@ -222,12 +224,14 @@ impl<'a> Reducer<'a> {
             Some(s) => s,
             None => return Expression::ReductionError(format!("No symbol found for name: {:?}", qualified_name))
         };
-        let Symbol { def_id, spec, .. } = symbol;
-        match spec {
-            Func(_) => Expression::Lookup { id: def_id.clone(), kind: Lookup::Function },
-            GlobalBinding => Expression::Lookup { id: def_id.clone(), kind: Lookup::GlobalVar },
-            LocalVariable => Expression::Lookup { id: def_id.clone(), kind: Lookup::LocalVar },
-            FunctionParam(n) => Expression::Lookup { id: def_id.clone(), kind: Lookup::Param(*n) },
+
+        let def_id = symbol.def_id();
+
+        match symbol.spec() {
+            Func(_) => Expression::Lookup { id: def_id.unwrap(), kind: Lookup::Function },
+            GlobalBinding => Expression::Lookup { id: def_id.unwrap(), kind: Lookup::GlobalVar },
+            LocalVariable => Expression::Lookup { id: def_id.unwrap(), kind: Lookup::LocalVar },
+            FunctionParam(n) => Expression::Lookup { id: def_id.unwrap(), kind: Lookup::Param(n) },
             DataConstructor { .. } => {
                 Expression::ReductionError("DataConstructor not supported".to_string())
             },

schala-lang/language/src/reduced_ir/types.rs

@@ -23,7 +23,7 @@ impl ReducedIR {
         println!("Functions:");
         println!("-----------");
         for (id, callable) in self.functions.iter() {
-            let name = &symbol_table.lookup_symbol_by_def(id).unwrap().local_name;
+            let name = &symbol_table.lookup_symbol_by_def(id).unwrap().local_name();
             println!("{}({}) -> {:?}", id, name, callable);
         }
         println!("");

schala-lang/language/src/symbol_table/mod.rs

@@ -226,15 +226,28 @@ impl SymbolTable {
 #[allow(dead_code)]
 #[derive(Debug, Clone)]
 pub struct Symbol {
-    pub local_name: Rc<String>, //TODO get rid of this, it can be computed from fqsn
     fully_qualified_name: Fqsn,
-    pub spec: SymbolSpec,
-    pub def_id: DefId,
+    spec: SymbolSpec,
+    def_id: DefId,
+}
+
+impl Symbol {
+    pub fn local_name(&self) -> Rc<String> {
+        self.fully_qualified_name.local_name()
+    }
+
+    pub fn def_id(&self) -> Option<DefId> {
+        Some(self.def_id.clone())
+    }
+
+    pub fn spec(&self) -> SymbolSpec {
+        self.spec.clone()
+    }
 }
 
 impl fmt::Display for Symbol {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(f, "<Local name: {}, Spec: {}>", self.local_name, self.spec)
+        write!(f, "<Local name: {}, Spec: {}>", self.local_name(), self.spec)
     }
 }
 
@@ -305,7 +318,6 @@ impl SymbolTable {
     fn add_symbol(&mut self, id: &ItemId, fqsn: Fqsn, spec: SymbolSpec) {
         let def_id = self.def_id_store.fresh();
         let symbol = Rc::new(Symbol {
-            local_name: fqsn.local_name(),
             fully_qualified_name: fqsn.clone(),
             spec,
             def_id,

schala-lang/language/src/util.rs

@@ -41,6 +41,7 @@ impl<'a, T, V, N> ScopeStack<'a, T, V, N> where T: Hash + Eq {
     }
   }
 
+  #[allow(dead_code)]
   pub fn lookup_with_scope(&self, key: &T) -> Option<(&V, Option<&N>)> where T: Hash + Eq {
       match (self.values.get(key), self.parent) {
           (None, None) => None,