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#! /usr/bin/env python
"""
This is a tool for exploring abstract syntax trees generated by
``compiler.parse()`` from test data in
docutils/test/test_readers/test_python/test_parser or stdin.
Usage::
showast <key> <index>
showast < <module.py>
Where ``<key>`` is the key to the ``totest`` dictionary, and ``<index>`` is
the index of the list ``totest[key]``. If no arguments are given, stdin is
used for input.
"""
import sys
import compiler
from compiler.ast import Node
import test_parser
def pformat(ast, indent=' ', level=0):
assert isinstance(ast, Node), 'ast is not a Node: %r' % (ast,)
atts = {}
for name, value in vars(ast).items():
if not value or isinstance(value, Node):
continue
if isinstance(value, list):
if isinstance(value[0], Node):
continue
if isinstance(value[0], tuple) and value[0] \
and isinstance(value[0][0], Node):
continue
atts[name] = str(value).encode('unicode-escape')
attlist = atts.items()
attlist.sort()
parts = [ast.__class__.__name__]
for name, value in attlist:
parts.append('%s="%s"' % (name, value))
result = ['%s<%s>\n' % (indent * level, ' '.join(parts))]
for node in ast.getChildNodes():
result.extend(pformat(node, level=level+1))
return result
if len(sys.argv) > 1:
key, caseno = sys.argv[1:]
print 'totest["%s"][%s][0]:\n' % (key, caseno)
input_text = test_parser.totest[key][int(caseno)][0]
else:
input_text = sys.stdin.read()
print input_text
module = compiler.parse(input_text)
print module
print
print ''.join(pformat(module)),
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