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'''
This software is licensed under the GPL (GNU General Public License) version 2
as it appears here: http://www.gnu.org/copyleft/gpl.html
It is also included with this archive as `gpl.txt <gpl.txt>`_.
'''
import compiler
from compiler import ast
from compiler import consts
def walk_ast(tree):
transformer = Visitor()
see = dict.fromkeys('Class Function'.split())
stack = [(tree, 0)]
while stack:
tree, seen = stack.pop()
if not isinstance(tree, ast.Node):
continue
name = tree.__class__.__name__
if name in see:
if seen:
yield 'end',
continue
if hasattr(transformer, 'visit'+name):
yield 'start', getattr(transformer, 'visit'+name)(tree), tree.lineno
if tree.doc:
yield 'doc', tree.doc
stack.append((tree, 1))
x = list(tree.getChildren())
x.reverse()
for i in x:
if isinstance(i, ast.Node):
stack.append((i, 0))
class Visitor:
def visitClass(self, node):
if node.bases:
return 'class %s(%s):'%(node.name, ', '.join([i.name for i in node.bases]))
return 'class %s:'%node.name
def visitFunction(self, node):
args = node.argnames[:]
args2 = []
if node.kwargs:
args2.append('**'+args.pop())
if node.varargs:
args2.append('*'+args.pop())
if node.defaults:
d = node.defaults[:]
while d:
args2.append(args.pop()+'=?')
_ = d.pop()
args2.reverse()
args += args2
return 'def %s(%s):'%(node.name, ', '.join(args))
if __name__ == '__main__':
a = '''import a, b, c
#I am a comment
# todo: I am a todo
def foo(x, y=6, *args,
**kwargs):
return None
class bar:
def __init__(self, foo=a, bar=b):
"""blah!"""
'''
x = compiler.parse(a)
for y in walk_ast(x, Visitor()):
print y
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