int, float, symbol and string AST nodes

wasp/ast.py

@@ -30,11 +30,37 @@ class Number(Atom):
         return self.value
 
     def __repr__(self):
-        return "<Number %s>" % self.value
+        return "<%s %s>" % (type(self).__name__, self.value)
+
+
+class Integer(Number):
+    pass
+
+
+class Float(Number):
+    pass
 
 
 class Symbol(Atom):
-    pass
+    def __init__(self, value):
+        self.value = value
+
+    def eval(self):
+        return self.value
+
+    def __repr__(self):
+        return "<Symbol %s>" % self.value
+
+
+class String(Atom):
+    def __init__(self, value):
+        self.value = value
+
+    def eval(self):
+        return self.value
+
+    def __repr__(self):
+        return "<String %s>" % self.value
 
 
 class Quote(Node):

wasp/parser/box.py

@@ -1,3 +1,4 @@
+import re
 from rply.token import BaseBox
 from wasp import ast
 
@@ -58,4 +59,14 @@ class Atom(BaseBox):
         return "%s" % (self.atom)
 
     def ast(self):
-        return ast.Number(int(self.atom))
+        if self.atom[0] == '"':
+            if self.atom[-1] == '"':
+                return ast.String(self.atom)
+            else:
+                raise ValueError("missing \"")
+        elif re.match(r'^\d+$', self.atom):
+            return ast.Integer(int(self.atom))
+        elif re.match(r'^\d+\.(\d+)$', self.atom):
+            return ast.Float(float(self.atom))
+        else:
+            return ast.Symbol(self.atom)