--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ast/Exp.d	Fri Apr 18 02:01:38 2008 +0200
@@ -0,0 +1,135 @@
+module ast.Exp;
+
+import tango.text.Util : jhash;
+
+import lexer.Token;
+
+import sema.SymbolTable;
+
+enum ExpType
+{
+    Binary,
+    Negate,
+    IntegerLit,
+    Identifier,
+    AssignExp,
+    CallExp,
+}
+
+class Exp
+{
+    this(ExpType expType) 
+    {
+        this.expType = expType;
+    }
+
+    ExpType expType;
+    Scope env;
+}
+
+class CallExp : Exp
+{
+    this(Exp exp, Exp[] args)
+    {
+        super(ExpType.CallExp);
+        this.exp = exp;
+        this.args = args;
+    }
+
+    Exp exp;
+    Exp[] args;
+}
+
+class AssignExp : Exp
+{
+    this(Identifier identifier, Exp exp)
+    {
+        super(ExpType.AssignExp);
+        this.identifier = identifier;
+        this.exp = exp;
+    }
+
+    Identifier identifier;
+    Exp exp;
+}
+
+class BinaryExp : Exp
+{
+    public enum Operator : char
+    {
+        Mul = '*', Div = '/',
+        Add = '+', Sub = '-'
+    }
+
+    this(Operator op, Exp left, Exp right)
+    {
+        super(ExpType.Binary);
+        this.op = op;
+        this.left = left;
+        this.right = right;
+    }
+
+    Operator op;
+    Exp left, right;
+}
+
+class NegateExp : Exp
+{
+    this(Exp exp)
+    {
+        super(ExpType.Negate);
+        this.exp = exp;
+    }
+
+    public Exp exp;
+}
+
+class IntegerLit : Exp
+{
+    this(Token t)
+    {
+        super(ExpType.IntegerLit);
+        this.token = t;
+    }
+
+    Token token;
+}
+
+class Identifier : Exp
+{
+    this(Token t)
+    {
+        super(ExpType.Identifier);
+        this.token = t;
+        name = t.get;
+    }
+
+    char[] get()
+    {
+        return name;
+    }
+
+    hash_t toHash()
+    {
+        return jhash(name);
+    }
+
+    int opCmp(Object o)
+    {
+        if (auto id = cast(Identifier)o)
+            return typeid(char[]).compare(&name, &id.name);
+        return 0;
+    }
+
+    int opEquals(Object o)
+    {
+        if (auto id = cast(Identifier)o)
+            return typeid(char[]).equals(&name, &id.name);
+        return 0;
+    }
+
+    Token token;
+    char[] name;
+}
+
+