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# -*- Mode: Python -*-
# GObject-Introspection - a framework for introspecting GObject libraries
# Copyright (C) 2008 Johan Dahlin
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA.
#
from contextlib import contextmanager
from cStringIO import StringIO
from xml.sax.saxutils import quoteattr
class XMLWriter(object):
def __init__(self):
self._data = StringIO()
self._tag_stack = []
self._indent = 0
self._indent_unit = 2
self._indent_char = ' '
# Private
def _calc_attrs_length(self, attributes, indent):
if indent == -1:
return -1
attr_length = 0
for attr, value in attributes:
if value is None:
raise ValueError(
"value for attribute %r cannot be None" % (attr,))
attr_length += 2 + len(attr) + len(quoteattr(value))
return attr_length + indent
def _collect_attributes(self, attributes, extra_indent=-1):
if not attributes:
return ''
extra_indent += len(self._indent_char) * self._indent
if self._calc_attrs_length(attributes, extra_indent) > 79:
indent_len = extra_indent
else:
indent_len = 0
first = True
attr_value = ''
for attr, value in attributes:
if indent_len and not first:
attr_value += '\n%s' % (self._indent_char * indent_len)
if value is None:
raise ValueError(
"value for attribute %r cannot be None" % (attr,))
attr_value += ' %s=%s' % (attr, quoteattr(value))
if first:
first = False
return attr_value
def _open_tag(self, tag_name, attributes=None):
attrs = self._collect_attributes(
attributes, len(tag_name) + 1)
self.write_line('<%s%s>' % (tag_name, attrs))
def _close_tag(self, tag_name):
self.write_line('</%s>' % (tag_name,))
# Public API
def get_xml(self):
return self._data.getvalue()
def write_line(self, line=''):
self._data.write('%s%s\n' % (self._indent_char * self._indent, line))
def write_tag(self, tag_name, attributes, data=None):
prefix = '<%s' % (tag_name,)
if data is not None:
suffix = '>%s</%s>' % (data, tag_name)
else:
suffix = '/>'
attrs = self._collect_attributes(
attributes, len(prefix) + len(suffix))
self.write_line(prefix + attrs + suffix)
def push_tag(self, tag_name, attributes=None):
self._open_tag(tag_name, attributes)
self._tag_stack.append(tag_name)
self._indent += self._indent_unit
def pop_tag(self):
self._indent -= self._indent_unit
tag_name = self._tag_stack.pop()
self._close_tag(tag_name)
return tag_name
@contextmanager
def tagcontext(self, tag_name, attributes=None):
self.push_tag(tag_name, attributes)
try:
yield
finally:
self.pop_tag()
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