-
Notifications
You must be signed in to change notification settings - Fork 215
/
astpprint.py
89 lines (69 loc) · 2.2 KB
/
astpprint.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
"""Python AST pretty-printer.
Copyright(C) 2007, Martin Blais <blais@furius.ca>
This module exports a function that can be used to print a human-readable
version of the AST.
This code is downloaded verbatim from:
http://code.activestate.com/recipes/533146/
"""
__author__ = 'Martin Blais <blais@furius.ca>'
import sys
from compiler.ast import Node
__all__ = ('printAst','getAststr')
from StringIO import StringIO
def getAststr(ast, indent=' ', initlevel=0):
"Pretty-print an AST to the given output stream."
stream = StringIO()
rec_node(ast, initlevel, indent, stream.write)
stream.write('\n')
stream.seek(0)
return stream.read()
def printAst(ast, indent=' ', stream=sys.stdout, initlevel=0):
"Pretty-print an AST to the given output stream."
rec_node(ast, initlevel, indent, stream.write)
stream.write('\n')
stream.flush()
def rec_node(node, level, indent, write):
"Recurse through a node, pretty-printing it."
pfx = indent * level
if isinstance(node, Node):
write(pfx)
write(node.__class__.__name__)
write('(')
i = 0
for child in node.getChildren():
if not isinstance(child, Node):
continue
if i != 0:
write(',')
write('\n')
rec_node(child, level+1, indent, write)
i += 1
if i == 0:
# None of the children as nodes, simply join their repr on a single
# line.
res = []
for child in node.getChildren():
res.append(repr(child))
write(', '.join(res))
else:
write('\n')
write(pfx)
write(')')
else:
write(pfx)
write(repr(node))
def main():
import optparse
parser = optparse.OptionParser(__doc__.strip())
opts, args = parser.parse_args()
if not args:
parser.error("You need to specify the name of Python files to print out.")
import compiler, traceback
for fn in args:
print '\n\n%s:\n' % fn
try:
printAst(compiler.parseFile(fn), initlevel=1)
except SyntaxError, e:
traceback.print_exc()
if __name__ == '__main__':
main()