2014-01-29 09:07:41 -06:00
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# -*- coding: utf-8 -*-
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# preprocessor.py - simple preprocessor for plugin template files
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2016-02-04 03:20:42 -06:00
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# This file is part of xed
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2014-01-29 09:07:41 -06:00
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#
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# Copyright (C) 2006 - Steve Frécinaux
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#
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2016-02-04 03:20:42 -06:00
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# xed is free software; you can redistribute it and/or modify
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2014-01-29 09:07:41 -06:00
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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2016-02-04 03:20:42 -06:00
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# xed is distributed in the hope that it will be useful,
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2014-01-29 09:07:41 -06:00
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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2016-02-04 03:20:42 -06:00
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# along with xed; if not, write to the Free Software
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2014-01-29 09:07:41 -06:00
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# Foundation, Inc., 51 Franklin St, Fifth Floor,
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# Boston, MA 02110-1301 USA
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import sys
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import re
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class DeepnessException(Exception):
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def __init__(self):
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Exception.__init__(self)
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statements = [re.compile("^##\s*%s\s*$" % pattern) for pattern in
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['(?P<stmt>ifdef|ifndef)\s+(?P<key>[^\s]+)',
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'(?P<stmt>elif|if)\s+(?P<expr>.+)',
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'(?P<stmt>else|endif)',
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'(?P<stmt>define)\s+(?P<key>[^\s]+)(\s+(?P<val>.+))?',
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'(?P<stmt>undef)\s+(?P<key>[^\s]+)']]
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variable = re.compile("##\((?P<name>[a-zA-Z_][a-zA-Z0-9_]*)(?P<mods>(\.[a-z]+)+)?\)")
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def _eval(expr, macros):
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return eval(expr,
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{'defined': lambda x: macros.has_key(x)},
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macros)
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def _subvar(match, macros):
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name = match.group('name')
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if name in macros:
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val = str(macros[name])
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if val is None:
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return ''
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else:
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return ''
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mods = match.group('mods')
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if mods is not None:
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for mod in mods[1:].split('.'):
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if mod == 'lower':
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val = val.lower()
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elif mod == 'upper':
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val = val.upper()
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elif mod == 'camel':
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val = ''.join(i.capitalize()
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for i in val.split('_'))
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return val
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def process(infile = sys.stdin, outfile = sys.stdout, macros = {}):
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if not isinstance(infile, file):
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infile = open(infile, mode = 'r')
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close_infile = True
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else:
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close_infile = False
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if not isinstance(outfile, file):
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outfile = open(outfile, mode = 'w')
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close_outfile = True
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else:
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close_outfile = False
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deepness = 0
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writing_disabled = None
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for line in infile:
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# Skip comments
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if line[0:3].lower() == '##c':
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continue
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# Check whether current line is a preprocessor directive
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for statement in statements:
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match = statement.match(line)
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if match: break
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if match is not None:
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stmt = match.group('stmt')
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if stmt == "define":
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if writing_disabled is None:
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key = match.group('key')
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val = match.group('val')
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macros[key] = val
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elif stmt == "undef":
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if writing_disabled is None:
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key = match.group('key')
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if key in macros:
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del macros[key]
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elif stmt == "ifdef":
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deepness += 1
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if writing_disabled is None and \
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match.group('key') not in macros:
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writing_disabled = deepness
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elif stmt == "ifndef":
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deepness += 1
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if writing_disabled is None and \
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match.group('key') in macros:
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writing_disabled = deepness
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elif stmt == "if":
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deepness += 1
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if writing_disabled is None and \
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not _eval(match.group('expr'), macros):
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writing_disabled = deepness
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elif stmt == "elif":
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if deepness == 0:
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raise DeepnessException()
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if writing_disabled is None and \
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not _eval(match.group('expr'), macros):
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writing_disabled = deepness
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elif writing_disabled == deepness:
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writing_disabled = None
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elif stmt == "else":
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if deepness == 0:
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raise DeepnessException()
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if writing_disabled is None:
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writing_disabled = deepness
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elif writing_disabled == deepness:
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writing_disabled = None
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elif stmt == "endif":
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if deepness == 0:
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raise DeepnessException()
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if writing_disabled is not None and \
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writing_disabled == deepness:
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writing_disabled = None
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deepness -= 1
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# Do variable substitution in the remaining lines
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elif writing_disabled is None:
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outfile.write(re.sub(variable,
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lambda m: _subvar(m, macros),
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line))
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if deepness != 0:
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raise DeepnessException()
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if close_infile: infile.close()
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if close_outfile: outfile.close()
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# ex:ts=4:et:
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