type checking / symbol table stuff

src/schala_lang/type_check.rs

@@ -1,11 +1,17 @@
+use std::collections::HashMap;
+
 use schala_lang::parsing::{AST, Statement, Declaration, Expression, ExpressionType, Operation, TypeAnno};
 
+#[derive(Debug, PartialEq, Eq, Hash)]
+struct PathSpecifier(String);
+
 struct SymbolTable {
+  map: HashMap<PathSpecifier, Expression>,
 }
 
 impl SymbolTable {
   fn new() -> SymbolTable {
-    SymbolTable { }
+    SymbolTable { map: HashMap::new() }
   }
 
   fn add_symbols(&mut self, ast: &AST) {
@@ -51,6 +57,16 @@ impl TypeContext {
           return Err(format!("Declarations not supported"));
         },
         &Statement::ExpressionStatement(ref expr) => {
+          self.expr_type_check(expr)?;
+        }
+      }
+    }
+    Ok(SchalaType { })
+  }
+
+  fn expr_type_check(&mut self, expr: &Expression) -> TypeCheckResult {
+    use self::ExpressionType::*;
+
     match (&expr.0, &expr.1) {
       (&IntLiteral(_), &Some(ref t)) => {
         match t {
@@ -60,9 +76,6 @@ impl TypeContext {
       },
       _ => (),
     }
-        }
-      }
-    }
     Ok(SchalaType { })
   }
 }