mirror of
https://github.com/mozilla/gecko-dev.git
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470 lines
15 KiB
Python
470 lines
15 KiB
Python
"""
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This is a very primitive line based preprocessor, for times when using
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a C preprocessor isn't an option.
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"""
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# ***** BEGIN LICENSE BLOCK *****
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# Version: MPL 1.1/GPL 2.0/LGPL 2.1
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#
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# The contents of this file are subject to the Mozilla Public License Version
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# 1.1 (the "License"); you may not use this file except in compliance with
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# the License. You may obtain a copy of the License at
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# http://www.mozilla.org/MPL/
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#
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# Software distributed under the License is distributed on an "AS IS" basis,
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# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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# for the specific language governing rights and limitations under the
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# License.
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#
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# The Original Code is Mozilla build system.
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#
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# The Initial Developer of the Original Code is
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# Mozilla Foundation.
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# Portions created by the Initial Developer are Copyright (C) 2007
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# the Initial Developer. All Rights Reserved.
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#
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# Contributor(s):
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# Axel Hecht <axel@pike.org>
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#
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# Alternatively, the contents of this file may be used under the terms of
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# either the GNU General Public License Version 2 or later (the "GPL"), or
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# the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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# in which case the provisions of the GPL or the LGPL are applicable instead
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# of those above. If you wish to allow use of your version of this file only
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# under the terms of either the GPL or the LGPL, and not to allow others to
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# use your version of this file under the terms of the MPL, indicate your
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# decision by deleting the provisions above and replace them with the notice
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# and other provisions required by the GPL or the LGPL. If you do not delete
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# the provisions above, a recipient may use your version of this file under
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# the terms of any one of the MPL, the GPL or the LGPL.
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#
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# ***** END LICENSE BLOCK *****
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import sys
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import os
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import os.path
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import re
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from optparse import OptionParser
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# hack around win32 mangling our line endings
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# http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/65443
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if sys.platform == "win32":
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import os, msvcrt
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msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY)
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import Expression
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__all__ = ['Preprocessor', 'preprocess']
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class Preprocessor:
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"""
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Class for preprocessing text files.
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"""
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class Error(RuntimeError):
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def __init__(self, cpp, MSG, context):
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self.file = cpp.context['FILE']
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self.line = cpp.context['LINE']
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self.key = MSG
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RuntimeError.__init__(self, (self.file, self.line, self.key, context))
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def __init__(self):
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self.context = Expression.Context()
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for k,v in {'FILE': '',
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'LINE': 0,
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'DIRECTORY': os.path.abspath('.')}.iteritems():
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self.context[k] = v
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self.disableLevel = 0
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# ifStates can be
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# 0: hadTrue
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# 1: wantsTrue
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# 2: #else found
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self.ifStates = []
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self.checkLineNumbers = False
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self.writtenLines = 0
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self.filters = []
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self.cmds = {}
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for cmd, level in {'define': 0,
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'undef': 0,
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'if': sys.maxint,
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'ifdef': sys.maxint,
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'ifndef': sys.maxint,
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'else': 1,
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'elif': 1,
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'elifdef': 1,
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'elifndef': 1,
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'endif': sys.maxint,
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'expand': 0,
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'literal': 0,
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'filter': 0,
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'unfilter': 0,
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'include': 0,
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'includesubst': 0,
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'error': 0}.iteritems():
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self.cmds[cmd] = (level, getattr(self, 'do_' + cmd))
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self.out = sys.stdout
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self.setMarker('#')
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self.LE = '\n'
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self.varsubst = re.compile('@(?P<VAR>\w+)@', re.U)
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def setLineEndings(self, aLE):
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"""
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Set the line endings to be used for output.
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"""
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self.LE = {'cr': '\x0D', 'lf': '\x0A', 'crlf': '\x0D\x0A'}[aLE]
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def setMarker(self, aMarker):
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"""
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Set the marker to be used for processing directives.
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Used for handling CSS files, with pp.setMarker('%'), for example.
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"""
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self.marker = aMarker
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self.instruction = re.compile('%s(?P<cmd>[a-z]+)(?:\s(?P<args>.*))?$'%aMarker, re.U)
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self.comment = re.compile(aMarker, re.U)
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def clone(self):
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"""
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Create a clone of the current processor, including line ending
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settings, marker, variable definitions, output stream.
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"""
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rv = Preprocessor()
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rv.context.update(self.context)
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rv.setMarker(self.marker)
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rv.LE = self.LE
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rv.out = self.out
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return rv
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def write(self, aLine):
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"""
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Internal method for handling output.
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"""
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if self.checkLineNumbers:
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self.writtenLines += 1
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ln = self.context['LINE']
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if self.writtenLines != ln:
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self.out.write('//@line %(line)d "%(file)s"%(le)s'%{'line': ln,
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'file': self.context['FILE'],
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'le': self.LE})
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self.writtenLines = ln
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for f in self.filters:
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aLine = f[1](aLine)
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aLine = aLine.rstrip('\r\n') + self.LE
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self.out.write(aLine)
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def handleCommandLine(self, args, defaultToStdin = False):
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"""
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Parse a commandline into this parser.
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Uses OptionParser internally, no args mean sys.argv[1:].
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"""
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includes = []
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def handleI(option, opt, value, parser):
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includes.append(value)
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def handleE(option, opt, value, parser):
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for k,v in os.environ.iteritems():
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self.context[k] = v
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def handleD(option, opt, value, parser):
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vals = value.split('=')
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assert len(vals) < 3
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if len(vals) == 1:
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vals.append(1)
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self.context[vals[0]] = vals[1]
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def handleU(option, opt, value, parser):
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del self.context[value]
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def handleF(option, opt, value, parser):
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self.do_filter(value)
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def handleLE(option, opt, value, parser):
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self.setLineEndings(value)
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def handleMarker(option, opt, value, parser):
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self.setMarker(value)
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p = OptionParser()
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p.add_option('-I', action='callback', callback=handleI, type="string",
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metavar="FILENAME", help='Include file')
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p.add_option('-E', action='callback', callback=handleE,
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help='Import the environment into the defined variables')
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p.add_option('-D', action='callback', callback=handleD, type="string",
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metavar="VAR[=VAL]", help='Define a variable')
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p.add_option('-U', action='callback', callback=handleU, type="string",
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metavar="VAR", help='Undefine a variable')
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p.add_option('-F', action='callback', callback=handleF, type="string",
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metavar="FILTER", help='Enabble the specified filter')
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p.add_option('--line-endings', action='callback', callback=handleLE,
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type="string", metavar="[cr|lr|crlf]",
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help='Use the specified line endings [Default: OS dependent]')
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p.add_option('--marker', action='callback', callback=handleMarker,
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type="string",
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help='Use the specified marker instead of #')
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(options, args) = p.parse_args(args=args)
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if defaultToStdin and len(args) == 0:
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args = [sys.stdin]
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includes.extend(args)
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for f in includes:
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self.do_include(f)
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pass
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def handleLine(self, aLine):
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"""
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Handle a single line of input (internal).
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"""
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m = self.instruction.match(aLine)
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if m:
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args = None
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cmd = m.group('cmd')
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try:
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args = m.group('args')
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except IndexError:
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pass
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if cmd not in self.cmds:
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raise Preprocessor.Error(self, 'INVALID_CMD', aLine)
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level, cmd = self.cmds[cmd]
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if (level >= self.disableLevel):
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cmd(args)
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elif self.disableLevel == 0 and not self.comment.match(aLine):
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self.write(aLine)
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pass
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# Instruction handlers
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# These are named do_'instruction name' and take one argument
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# Variables
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def do_define(self, args):
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m = re.match('(?P<name>\w+)(?:\s(?P<value>.*))?', args, re.U)
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if not m:
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raise Preprocessor.Error(self, 'SYNTAX_DEF', args)
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val = 1
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if m.group('value'):
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val = m.group('value')
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try:
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if val[0] == '0':
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val = int(val, 8)
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else:
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val = int(val)
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except:
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pass
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self.context[m.group('name')] = val
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def do_undef(self, args):
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m = re.match('(?P<name>\w+)$', args, re.U)
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if not m:
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raise Preprocessor.Error(self, 'SYNTAX_DEF', args)
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if args in self.context:
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del self.context[args]
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# Logic
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def ensure_not_else(self):
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if len(self.ifStates) == 0 or self.ifStates[-1] == 2:
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sys.stderr.write('WARNING: bad nesting of #else\n')
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def do_if(self, args, replace=False):
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if self.disableLevel and not replace:
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self.disableLevel += 1
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return
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val = None
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try:
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e = Expression.Expression(args)
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val = e.evaluate(self.context)
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except Exception:
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# XXX do real error reporting
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raise Preprocessor.Error(self, 'SYNTAX_ERR', args)
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if type(val) == str:
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# we're looking for a number value, strings are false
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val = False
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if not val:
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self.disableLevel = 1
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if replace:
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if val:
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self.disableLevel = 0
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self.ifStates[-1] = self.disableLevel
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else:
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self.ifStates.append(self.disableLevel)
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pass
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def do_ifdef(self, args, replace=False):
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if self.disableLevel and not replace:
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self.disableLevel += 1
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return
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if re.match('\W', args, re.U):
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raise Preprocessor.Error(self, 'INVALID_VAR', args)
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if args not in self.context:
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self.disableLevel = 1
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if replace:
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if args in self.context:
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self.disableLevel = 0
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self.ifStates[-1] = self.disableLevel
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else:
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self.ifStates.append(self.disableLevel)
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pass
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def do_ifndef(self, args, replace=False):
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if self.disableLevel and not replace:
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self.disableLevel += 1
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return
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if re.match('\W', args, re.U):
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raise Preprocessor.Error(self, 'INVALID_VAR', args)
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if args in self.context:
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self.disableLevel = 1
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if replace:
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if args not in self.context:
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self.disableLevel = 0
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self.ifStates[-1] = self.disableLevel
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else:
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self.ifStates.append(self.disableLevel)
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pass
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def do_else(self, args, ifState = 2):
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self.ensure_not_else()
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hadTrue = self.ifStates[-1] == 0
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self.ifStates[-1] = ifState # in-else
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if hadTrue:
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self.disableLevel = 1
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return
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self.disableLevel = 0
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def do_elif(self, args):
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if self.disableLevel == 1:
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if self.ifStates[-1] == 1:
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self.do_if(args, replace=True)
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else:
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self.do_else(None, self.ifStates[-1])
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def do_elifdef(self, args):
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if self.disableLevel == 1:
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if self.ifStates[-1] == 1:
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self.do_ifdef(args, replace=True)
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else:
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self.do_else(None, self.ifStates[-1])
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def do_elifndef(self, args):
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if self.disableLevel == 1:
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if self.ifStates[-1] == 1:
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self.do_ifndef(args, replace=True)
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else:
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self.do_else(None, self.ifStates[-1])
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def do_endif(self, args):
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if self.disableLevel > 0:
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self.disableLevel -= 1
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if self.disableLevel == 0:
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self.ifStates.pop()
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# output processing
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def do_expand(self, args):
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lst = re.split('__(\w+)__', args, re.U)
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do_replace = False
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def vsubst(v):
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if v in self.context:
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return str(self.context[v])
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return ''
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for i in range(1, len(lst), 2):
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lst[i] = vsubst(lst[i])
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lst.append('\n') # add back the newline
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self.write(reduce(lambda x, y: x+y, lst, ''))
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def do_literal(self, args):
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self.write(args)
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def do_filter(self, args):
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filters = [f for f in args.split(' ') if hasattr(self, 'filter_' + f)]
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if len(filters) == 0:
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return
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current = dict(self.filters)
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for f in filters:
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current[f] = getattr(self, 'filter_' + f)
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filterNames = current.keys()
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filterNames.sort()
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self.filters = [(fn, current[fn]) for fn in filterNames]
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return
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def do_unfilter(self, args):
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filters = args.split(' ')
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current = dict(self.filters)
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for f in filters:
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if f in current:
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del current[f]
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filterNames = current.keys()
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filterNames.sort()
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self.filters = [(fn, current[fn]) for fn in filterNames]
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return
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# Filters
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#
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# emptyLines
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# Strips blank lines from the output.
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def filter_emptyLines(self, aLine):
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if aLine == '\n':
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return ''
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return aLine
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# slashslash
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# Strips everything after //
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def filter_slashslash(self, aLine):
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[aLine, rest] = aLine.split('//', 1)
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if rest:
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aLine += '\n'
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return aLine
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# spaces
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# Collapses sequences of spaces into a single space
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def filter_spaces(self, aLine):
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return re.sub(' +', ' ', aLine).strip(' ')
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# substition
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# helper to be used by both substition and attemptSubstitution
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def filter_substitution(self, aLine, fatal=True):
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def repl(matchobj):
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varname = matchobj.group('VAR')
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if varname in self.context:
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return str(self.context[varname])
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if fatal:
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raise Preprocessor.Error(self, 'UNDEFINED_VAR', varname)
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return ''
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return self.varsubst.sub(repl, aLine)
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def filter_attemptSubstitution(self, aLine):
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return self.filter_substitution(aLine, fatal=False)
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# File ops
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def do_include(self, args):
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"""
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Preprocess a given file.
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args can either be a file name, or a file-like object.
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Files should be opened, and will be closed after processing.
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"""
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isName = type(args) == str or type(args) == unicode
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oldWrittenLines = self.writtenLines
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oldCheckLineNumbers = self.checkLineNumbers
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self.checkLineNumbers = False
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if isName:
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try:
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args = str(args)
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if not os.path.isabs(args):
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args = os.path.join(self.context['DIRECTORY'], args)
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args = open(args)
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except:
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raise Preprocessor.Error(self, 'FILE_NOT_FOUND', str(args))
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self.checkLineNumbers = bool(re.search('\.js(?:\.in)?$', args.name))
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oldFile = self.context['FILE']
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oldLine = self.context['LINE']
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oldDir = self.context['DIRECTORY']
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if args.isatty():
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# we're stdin, use '-' and '' for file and dir
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self.context['FILE'] = '-'
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self.context['DIRECTORY'] = ''
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else:
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abspath = os.path.abspath(args.name)
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self.context['FILE'] = abspath
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self.context['DIRECTORY'] = os.path.dirname(abspath)
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self.context['LINE'] = 0
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self.writtenLines = 0
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for l in args:
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self.context['LINE'] += 1
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self.handleLine(l)
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args.close()
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self.context['FILE'] = oldFile
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self.checkLineNumbers = oldCheckLineNumbers
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self.writtenLines = oldWrittenLines
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self.context['LINE'] = oldLine
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self.context['DIRECTORY'] = oldDir
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def do_includesubst(self, args):
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args = self.filter_substitution(args)
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self.do_include(args)
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def do_error(self, args):
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raise Preprocessor.Error(self, 'Error: ', str(args))
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def main():
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pp = Preprocessor()
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pp.handleCommandLine(None, True)
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return
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def preprocess(includes=[sys.stdin], defines={},
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output = sys.stdout,
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line_endings='\n', marker='#'):
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pp = Preprocessor()
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pp.context.update(defines)
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pp.setLineEndings(line_endings)
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pp.setMarker(marker)
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pp.out = output
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for f in includes:
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pp.do_include(f)
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if __name__ == "__main__":
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main()
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