mirror of https://github.com/python/cpython.git
114 lines
3.1 KiB
Python
114 lines
3.1 KiB
Python
|
#! /usr/local/bin/python
|
||
|
|
|
||
|
|
# Selectively preprocess #ifdef / #ifndef statements.
|
||
|
|
# Usage:
|
||
|
|
# ifdef [-Dname] ... [-Uname] ... [file] ...
|
||
|
|
#
|
||
|
|
# This scans the file(s), looking for #ifdef and #ifndef preprocessor
|
||
|
|
# commands that test for one of the names mentioned in the -D and -U
|
||
|
|
# options. On standard output it writes a copy of the input file(s)
|
||
|
|
# minus those code sections that are suppressed by the selected
|
||
|
|
# combination of defined/undefined symbols. The #if(n)def/#else/#else
|
||
|
|
# lines themselfs (if the #if(n)def tests for one of the mentioned
|
||
|
|
# names) are removed as well.
|
||
|
|
|
||
|
|
# Features: Arbitrary nesting of recognized and unrecognized
|
||
|
|
# preprocesor statements works correctly. Unrecognized #if* commands
|
||
|
|
# are left in place, so it will never remove too much, only too
|
||
|
|
# little. It does accept whitespace around the '#' character.
|
||
|
|
|
||
|
|
# Restrictions: There should be no comments or other symbols on the
|
||
|
|
# #if(n)def lines. The effect of #define/#undef commands in the input
|
||
|
|
# file or in included files is not taken into account. Tests using
|
||
|
|
# #if and the defined() pseudo function are not recognized. The #elif
|
||
|
|
# command is not recognized. Improperly nesting is not detected.
|
||
|
|
# Lines that look like preprocessor commands but which are actually
|
||
|
|
# part of comments or string literals will be mistaken for
|
||
|
|
# preprocessor commands.
|
||
|
|
|
||
|
|
import sys
|
||
|
|
import regex
|
||
|
|
import getopt
|
||
|
|
import string
|
||
|
|
|
||
|
|
defs = []
|
||
|
|
undefs = []
|
||
|
|
|
||
|
|
def main():
|
||
|
|
opts, args = getopt.getopt(sys.argv[1:], 'D:U:')
|
||
|
|
for o, a in opts:
|
||
|
|
if o == '-D':
|
||
|
|
defs.append(a)
|
||
|
|
if o == '-U':
|
||
|
|
undefs.append(a)
|
||
|
|
if not args:
|
||
|
|
args = ['-']
|
||
|
|
for file in args:
|
||
|
|
if file == '-':
|
||
|
|
process(sys.stdin, sys.stdout)
|
||
|
|
else:
|
||
|
|
f = open(file, 'r')
|
||
|
|
process(f, sys.stdout)
|
||
|
|
f.close()
|
||
|
|
|
||
|
|
def process(fpi, fpo):
|
||
|
|
keywords = ('if', 'ifdef', 'ifndef', 'else', 'endif')
|
||
|
|
ok = 1
|
||
|
|
stack = []
|
||
|
|
while 1:
|
||
|
|
line = fpi.readline()
|
||
|
|
if not line: break
|
||
|
|
while line[-2:] == '\\\n':
|
||
|
|
nextline = fpi.readline()
|
||
|
|
if not nextline: break
|
||
|
|
line = line + nextline
|
||
|
|
tmp = string.strip(line)
|
||
|
|
if tmp[:1] != '#':
|
||
|
|
if ok: fpo.write(line)
|
||
|
|
continue
|
||
|
|
tmp = string.strip(tmp[1:])
|
||
|
|
words = string.split(tmp)
|
||
|
|
keyword = words[0]
|
||
|
|
if keyword not in keywords:
|
||
|
|
if ok: fpo.write(line)
|
||
|
|
continue
|
||
|
|
if keyword in ('ifdef', 'ifndef') and len(words) == 2:
|
||
|
|
if keyword == 'ifdef':
|
||
|
|
ko = 1
|
||
|
|
else:
|
||
|
|
ko = 0
|
||
|
|
word = words[1]
|
||
|
|
if word in defs:
|
||
|
|
stack.append(ok, ko, word)
|
||
|
|
if not ko: ok = 0
|
||
|
|
elif word in undefs:
|
||
|
|
stack.append(ok, not ko, word)
|
||
|
|
if ko: ok = 0
|
||
|
|
else:
|
||
|
|
stack.append(ok, -1, word)
|
||
|
|
if ok: fpo.write(line)
|
||
|
|
elif keyword == 'if':
|
||
|
|
stack.append(ok, -1, '')
|
||
|
|
if ok: fpo.write(line)
|
||
|
|
elif keyword == 'else' and stack:
|
||
|
|
s_ok, s_ko, s_word = stack[-1]
|
||
|
|
if s_ko < 0:
|
||
|
|
if ok: fpo.write(line)
|
||
|
|
else:
|
||
|
|
s_ko = not s_ko
|
||
|
|
ok = s_ok
|
||
|
|
if not s_ko: ok = 0
|
||
|
|
stack[-1] = s_ok, s_ko, s_word
|
||
|
|
elif keyword == 'endif' and stack:
|
||
|
|
s_ok, s_ko, s_word = stack[-1]
|
||
|
|
if s_ko < 0:
|
||
|
|
if ok: fpo.write(line)
|
||
|
|
del stack[-1]
|
||
|
|
ok = s_ok
|
||
|
|
else:
|
||
|
|
sys.stderr.write('Unknown keyword %s\n' % keyword)
|
||
|
|
if stack:
|
||
|
|
sys.stderr.write('stack: %s\n' % stack)
|
||
|
|
|
||
|
|
main()
|