add new library for python export

1 files changed, 52 insertions, 0 deletions

diff --git a/util/ast_extensions.py b/util/ast_extensions.py
new file mode 100644
index 0000000..3335afb
--- /dev/null
+++ b/util/ast_extensions.py
@@ -0,0 +1,52 @@
+#Copyright (c) 2013 Marion Zepf
+
+#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.
+
+
+""" Extend the `ast` module to include comments """
+
+import ast
+
+
+class Comment(ast.stmt):
+    """ An inline comment, starting with a hashtag (#).
+    Extends the Python abstract grammar by the following:
+    stmt = Comment(string text) | ... """
+
+    _fields = ('text')
+
+    def __init__(self, text="", lineno=1, col_offset=0):
+        """ text -- the textual content of the comment, i.e. everything
+            directly following the hashtag until the next newline """
+        self.text = text
+        self.lineno = lineno
+        self.col_offset = col_offset
+
+
+class LambdaWithStrBody(ast.Lambda):
+    """ Lambda AST whose body is a simple string (not ast.Str).
+    Extends the Python abstract grammar by the following:
+    expr = LambdaWithStrBody(string body_str, expr* args) | ... """
+
+    def __init__(self, body_str="", args=[], lineno=1, col_offset=0):
+        self.body_str = body_str
+        self.args = args
+        self.lineno = lineno
+        self.col_offset = col_offset
+