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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
# Private
def _collect_attributes(self, attributes):
attrValue = ''
if attributes:
for attr, value in attributes:
assert value is not None, attr
attrValue += ' %s=%s' % (attr, quoteattr(value))
return attrValue
def _open_tag(self, tag_name, attributes=None):
attrs = self._collect_attributes(attributes)
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, line))
def write_tag(self, tag_name, attributes):
attrs = self._collect_attributes(attributes)
self.write_line('<%s%s/>' % (tag_name, attrs))
def write_tag_with_data(self, tag_name, data, attributes=None):
if data is None:
self.write_tag(tag_name, attributes)
attrs = self._collect_attributes(attributes)
self.write_line('<%s%s>%s</%s>' % (tag_name, attrs, data, tag_name))
def push_tag(self, tag_name, attributes=None):
self._open_tag(tag_name, attributes)
self._tag_stack.append(tag_name)
self._indent += 2
def pop_tag(self):
self._indent -= 2
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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