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#!/usr/bin/python2.4
# Copyright 2008, Google Inc.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
# * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
'''Class for reading GRD files into memory, without processing them.
'''
import os.path
import types
import xml.sax
import xml.sax.handler
from grit import exception
from grit.node import base
from grit.node import mapping
from grit import util
class StopParsingException(Exception):
'''An exception used to stop parsing.'''
pass
class GrdContentHandler(xml.sax.handler.ContentHandler):
def __init__(self, stop_after=None, debug=False):
# Invariant of data:
# 'root' is the root of the parse tree being created, or None if we haven't
# parsed out any elements.
# 'stack' is the a stack of elements that we push new nodes onto and
# pop from when they finish parsing, or [] if we are not currently parsing.
# 'stack[-1]' is the top of the stack.
self.root = None
self.stack = []
self.stop_after = stop_after
self.debug = debug
def startElement(self, name, attrs):
assert not self.root or len(self.stack) > 0
if self.debug:
attr_list = []
for attr in attrs.getNames():
attr_list.append('%s="%s"' % (attr, attrs.getValue(attr)))
if len(attr_list) == 0: attr_list = ['(none)']
attr_list = ' '.join(attr_list)
print "Starting parsing of element %s with attributes %r" % (name, attr_list)
typeattr = None
if 'type' in attrs.getNames():
typeattr = attrs.getValue('type')
node = mapping.ElementToClass(name, typeattr)()
if not self.root:
self.root = node
if len(self.stack) > 0:
self.stack[-1].AddChild(node)
node.StartParsing(name, self.stack[-1])
else:
node.StartParsing(name, None)
# Push
self.stack.append(node)
for attr in attrs.getNames():
node.HandleAttribute(attr, attrs.getValue(attr))
def endElement(self, name):
if self.debug:
print "End parsing of element %s" % name
# Pop
self.stack[-1].EndParsing()
assert len(self.stack) > 0
self.stack = self.stack[:-1]
if self.stop_after and name == self.stop_after:
raise StopParsingException()
def characters(self, content):
if self.stack[-1]:
self.stack[-1].AppendContent(content)
def ignorableWhitespace(self, whitespace):
# TODO(joi) This is not supported by expat. Should use a different XML parser?
pass
def Parse(filename_or_stream, dir = None, flexible_root = False,
stop_after=None, debug=False):
'''Parses a GRD file into a tree of nodes (from grit.node).
If flexible_root is False, the root node must be a <grit> element. Otherwise
it can be any element. The "own" directory of the file will only be fixed up
if the root node is a <grit> element.
'dir' should point to the directory of the input file, or be the full path
to the input file (the filename will be stripped).
If 'stop_after' is provided, the parsing will stop once the first node
with this name has been fully parsed (including all its contents).
If 'debug' is true, lots of information about the parsing events will be
printed out during parsing of the file.
Args:
filename_or_stream: './bla.xml' (must be filename if dir is None)
dir: '.' or None (only if filename_or_stream is a filename)
flexible_root: True | False
stop_after: 'inputs'
debug: False
Return:
Subclass of grit.node.base.Node
Throws:
grit.exception.Parsing
'''
handler = GrdContentHandler(stop_after=stop_after, debug=debug)
try:
xml.sax.parse(filename_or_stream, handler)
except StopParsingException:
assert stop_after
pass
except:
raise
if not flexible_root or hasattr(handler.root, 'SetOwnDir'):
assert isinstance(filename_or_stream, types.StringType) or dir != None
if not dir:
dir = util.dirname(filename_or_stream)
if len(dir) == 0:
dir = '.'
# Fix up the base_dir so it is relative to the input file.
handler.root.SetOwnDir(dir)
return handler.root
if __name__ == '__main__':
util.ChangeStdoutEncoding()
print unicode(Parse(sys.argv[1]))
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