Adding more testing.

hy/compilers/__init__.py

@@ -18,7 +18,15 @@
 # FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 # DEALINGS IN THE SOFTWARE.
 
+from abc import ABCMeta, abstractmethod
+
 
 class HyCompiler(object):
+    __metaclass__ = ABCMeta
+
     def __init__(self):
         pass
+
+    @abstractmethod
+    def compile(self, tree):
+        pass

hy/compilers/ast.py

@@ -18,5 +18,8 @@
 # FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 # DEALINGS IN THE SOFTWARE.
 
+from hy.compilers import HyCompiler
 
 
+class HyASTCompiler(HyCompiler):
+    pass

setup.py

@@ -37,6 +37,7 @@ setup(
         'hy',
         'hy.lex',
         'hy.models',
+        'hy.compilers',
     ],
     author="Paul Tagliamonte",
     author_email="tag@pault.ag",

tests/compilers/test_ast.py

@@ -0,0 +1,28 @@
+# Copyright (c) 2012 Paul Tagliamonte <paultag@debian.org>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a
+# copy of this software and associated documentation files (the "Software"),
+# to deal in the Software without restriction, including without limitation
+# the rights to use, copy, modify, merge, publish, distribute, sublicense,
+# and/or sell copies of the Software, and to permit persons to whom the
+# Software is furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+# DEALINGS IN THE SOFTWARE.
+
+from hy.compilers.ast import HyASTCompiler
+from hy.lex import tokenize
+
+
+def test_ast_expression():
+    """ Test AST --> Expression conversion """
+    compiler = HyASTCompiler()
+    code = compiler.compile(tokenize("(foo bar)"))