From ff1a97485bf239ee373d127fd85b0820e5b89e58 Mon Sep 17 00:00:00 2001
From: Paul Tagliamonte <paultag@debian.org>
Date: Sat, 22 Dec 2012 14:03:56 -0500
Subject: [PATCH] small interesting bits.

---
 hy/compiler/ast27.py | 59 ++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 54 insertions(+), 5 deletions(-)

diff --git a/hy/compiler/ast27.py b/hy/compiler/ast27.py
index 4af7db2..702d068 100644
--- a/hy/compiler/ast27.py
+++ b/hy/compiler/ast27.py
@@ -1,21 +1,70 @@
 # output ast for cpython 2.7
+import ast
+
+from hy.lang.expression import HYExpression
+from hy.lang.string import HYString
 
 from hy.lang.builtins import builtins
 from hy.lang.natives import natives
 
+
 offset = 0
 def _new_fn_name():
     global offset
     offset += 1
     return "_hy_fn_%s" % (offset)
 
-# body=[Print(dest=None,
-#             values=[BinOp(left=Num(n=1), op=Add(), right=Num(n=1))],
-#             nl=True)]
-# body=[Expr(value=BinOp(left=Num(n=1), op=Add(), right=Num(n=1)))]
 
+def _ast_print(node, children):
+    return ast.Print(
+        dest=None,
+        values=children,
+        nl=True
+    )
+
+
+special_cases = {
+    "print": _ast_print
+}
+
+
+class AST27Converter(object):
+    def __init__(self):
+        self.table = {
+            HYString: self.render_string,
+            HYExpression: self.render_expression
+        }
+
+    def render_string(self, node):
+        return ast.Str(s=node)
+
+    def render_number(self, node):
+        pass
+
+    def render_expression(self, node):
+        c = []
+        for child in node.get_children():
+            c.append(self.render(child))
+
+        inv = node.get_invocation()
+        if inv['function'] in special_cases:
+            return special_cases[inv['function']](node, c)
+
+        return ret
+
+    def render(self, tree):
+        t = type(tree)
+        handler = self.table[t]
+        ret = handler(tree)
+
+        return ret
 
 
 def forge_ast(name, forest):
+    conv = AST27Converter()
+
+    statements = []
     for tree in forest:
-        print tree
+        statements.append(conv.render(tree))
+
+    print [ast.dump(x) for x in statements]