Created
July 30, 2013 16:16
-
-
Save Vanuan/6114423 to your computer and use it in GitHub Desktop.
Print Python AST
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
import sys, ast | |
def printAst(ast, indent=' ', stream=sys.stdout, initlevel=0): | |
"Pretty-print an AST to the given output stream." | |
print_node(ast, initlevel, indent, stream.write) | |
stream.write('\n') | |
def print_node(node, level, indent, write): | |
"Recurse through a node, pretty-printing it." | |
pfx = indent * level | |
pfx_prev = indent * (level - 1) | |
if not isinstance(node, list): | |
write(node.__class__.__name__) | |
if hasattr(node, 'body'): | |
if hasattr(node, 'name'): | |
write(" '" + node.name + "' ") | |
write('(\n') | |
for child in node.body: | |
write(pfx) | |
print_node(child, level+1, indent, write) | |
write('\n') | |
write(pfx_prev + ')') | |
elif hasattr(node, 'value'): | |
write('[ ') | |
if hasattr(node, 'targets'): | |
print_node(node.targets, level+1, indent, write) | |
write(' = ') | |
print_node(node.value, level+1, indent, write) | |
if hasattr(node, 'attr'): | |
write('.') | |
write(node.attr) | |
write(' ]') | |
elif hasattr(node, 'func'): | |
write('(') | |
print_node(node.func, level+1, indent, write) | |
if hasattr(node, 'args'): | |
write('(') | |
print_node(node.args, level+1, indent, write) | |
write(')') | |
write(')') | |
elif isinstance(node, list): | |
for n in node: | |
print_node(n, level+1, indent, write) | |
write(',') | |
elif hasattr(node, 'id'): | |
write('(' + repr(node.id) + ')') | |
elif hasattr(node, 's'): | |
write('(' + repr(node.s) + ')') | |
def main(): | |
if len(sys.argv) < 2: | |
parser.error("You need to specify the name of Python files to print out.") | |
import traceback | |
for fn in sys.argv[1:]: | |
print '\n\n%s:\n' % fn | |
try: | |
f = open(fn, 'r') | |
source = f.read() | |
printAst(ast.parse(source), initlevel=1) | |
except SyntaxError, e: | |
traceback.print_exc() | |
if __name__ == '__main__': | |
main() |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment