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html5lib_adapter_test.py
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html5lib_adapter_test.py
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# Copyright 2012 Google Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
"""Tests for the Gumbo => Html5lib adapter."""
import codecs
import collections
import glob
import os
import re
import StringIO
import warnings
from html5lib import treebuilders
import unittest
import html5lib_adapter
TREEBUILDER = treebuilders.getTreeBuilder('dom')
TESTDATA_BASE_PATH = os.path.join(
os.path.split(__file__)[0], '..', '..')
# Copied from html5lib.tests/test_parser.py
def convertTreeDump(data):
return "\n".join(convertExpected(data, 3).split("\n")[1:])
# Copied/adapted/simplified from html5lib.tests/support.py
def html5lib_test_files():
return glob.glob(os.path.join(
TESTDATA_BASE_PATH, 'testdata', 'tree-construction', '*.dat'))
class TestData(object):
def __init__(self, filename):
self.f = codecs.open(filename, encoding="utf8")
def __iter__(self):
data = collections.defaultdict(lambda: None)
key=None
for line in self.f:
heading = self.isSectionHeading(line)
if heading:
if data and heading == 'data':
#Remove trailing newline
data[key] = data[key][:-1]
yield self.normaliseOutput(data)
data = collections.defaultdict(lambda: None)
key = heading
data[key] = ''
elif key is not None:
data[key] += line
if data:
yield self.normaliseOutput(data)
def isSectionHeading(self, line):
"""If the current heading is a test section heading return the heading,
otherwise return False"""
if line.startswith("#"):
return line[1:].strip()
else:
return False
def normaliseOutput(self, data):
# Remove trailing newlines
for key, value in data.iteritems():
if value.endswith("\n"):
data[key] = value[:-1]
return data
def convertExpected(data, stripChars):
"""convert the output of str(document) to the format used in the testcases"""
data = data.split("\n")
rv = []
for line in data:
if line.startswith("|"):
rv.append(line[stripChars:])
else:
rv.append(line)
return "\n".join(rv)
class Html5libAdapterTest(unittest.TestCase):
"""Adapter between Gumbo and the html5lib tests.
This works through a bit of magic. It's an empty class at first, but then
buildTestCases runs through the test files in html5lib, and adds a
method to this class for each one. That method acts like
test_parser.TestCase.runParserTest, running a parse, serializing the tree, and
comparing it to the expected output.
The vague name is so nosetests doesn't try to run it as a test.
"""
def impl(self, inner_html, input, expected, errors):
p = html5lib_adapter.HTMLParser(
tree=TREEBUILDER(namespaceHTMLElements=True))
if not inner_html:
# TODO(jdtang): Need to implement fragment parsing.
document = p.parse(StringIO.StringIO(input))
else:
return
with warnings.catch_warnings():
# Etree serializer in html5lib uses a deprecated getchildren() API.
warnings.filterwarnings('ignore', category=DeprecationWarning)
output = convertTreeDump(p.tree.testSerializer(document))
expected = re.compile(r'^(\s*)<(\S+)>', re.M).sub(
r'\1<html \2>', convertExpected(expected, 2))
error_msg = '\n'.join(['\n\nInput:', input, '\nExpected:', expected,
'\nReceived:', output])
self.assertEquals(expected, output,
error_msg.encode('ascii', 'xmlcharrefreplace') + '\n')
# TODO(jdtang): Check error messages, when there's full error support.
def BuildTestCases(cls):
for filename in html5lib_test_files():
test_name = os.path.basename(filename).replace('.dat', '')
for i, test in enumerate(TestData(filename)):
# html5lib parses <noscript> tags as if the scripting-enabled flag is
# set, while we parse as if the scripting-disabled flag is set (since we
# don't really support scripting and the resulting parse tree is often
# more useful for toolsmiths). That means our output will differ by
# design from html5lib's, so we disable any of their tests that involve
# <noscript>
if '<noscript>' in test['data']:
continue
def test_func(
self,
inner_html=test['document-fragment'],
input=test['data'],
expected=test['document'],
errors=test.get('errors', '').split('\n')):
return self.impl(inner_html, input, expected, errors)
test_func.__name__ = 'test_%s_%d' % (test_name, i + 1)
setattr(cls, test_func.__name__, test_func)
if __name__ == '__main__':
BuildTestCases(Html5libAdapterTest)
unittest.main()