openstack/deb-python-django-compressor
Code Issues Proposed changes

Created new parser, HtmlParser, based on the stdlib HTMLParser module.

Browse Source 
Added AutoSelectParser, picks LxmlParser if lxml is available, falls back to HtmlParser if not, also the new default.
Created a special BeautifulSoupTest in order to still test this parser.
Updated README, installation and settings docs to reflect these changes.
This commit is contained in:
Jaap Roes
2011-04-19 20:22:08 +02:00
committed by Jannis Leidel
parent cee8021c6b
commit b6d5131611
11 changed files with 168 additions and 51 deletions
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7
README.rst
View File

@@ -29,9 +29,10 @@ Configurability & Extendibility
-------------------------------
Django Compressor is highly configurable and extendible. The HTML parsing
is done using BeautifulSoup_ by default. As an alternative Django Compressor
provides an lxml_ and a html5lib_ based parser, as well as an abstract base
class that makes it easy to write a custom parser.
is done using lxml_ or if it's not available Python's built-in HTMLParser by
default. As an alternative Django Compressor provides a BeautifulSoup_ and a
html5lib_ based parser, as well as an abstract base class that makes it easy to
write a custom parser.
Django Compressor also comes with built-in support for `CSS Tidy`_,
`YUI CSS and JS`_ compressor, the Google's `Closure Compiler`_, a Python

2
compressor/base.py
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@@ -88,8 +88,6 @@ class Compressor(object):
def hunks(self):
for kind, value, elem in self.split_contents():
if kind == "hunk":
# Let's cast BeautifulSoup element to unicode here since
# it will try to encode using ascii internally later
yield unicode(self.filter(
value, method="input", elem=elem, kind=kind))
elif kind == "file":

28
compressor/parser/__init__.py
View File

@@ -1,5 +1,31 @@
from django.utils.functional import LazyObject
from django.utils.importlib import import_module
# support legacy parser module usage
from compressor.parser.base import ParserBase
from compressor.parser.beautifulsoup import BeautifulSoupParser
from compressor.parser.lxml import LxmlParser
from compressor.parser.htmlparser import HtmlParser
from compressor.parser.beautifulsoup import BeautifulSoupParser
from compressor.parser.html5lib import Html5LibParser
class AutoSelectParser(LazyObject):
options = (
('lxml.html', LxmlParser), # lxml, extremely fast
('HTMLParser', HtmlParser), # fast and part of the Python stdlib
)
def __init__(self, content):
self._wrapped = None
self._setup(content)
def __getattr__(self, name):
return getattr(self._wrapped, name)
def _setup(self, content):
for dependency, parser in self.options:
try:
import_module(dependency)
self._wrapped = parser(content)
break
except ImportError:
continue

3
compressor/parser/html5lib.py
View File

@@ -47,4 +47,7 @@ class Html5LibParser(ParserBase):
return elem.name
def elem_str(self, elem):
# This method serializes HTML in a way that does not pass all tests.
# However, this method is only called in tests anyway, so it doesn't
# really matter.
return smart_unicode(self._serialize(elem))

77
compressor/parser/htmlparser.py Normal file
View File

@@ -0,0 +1,77 @@
from HTMLParser import HTMLParser
from django.utils.encoding import smart_unicode
from django.utils.datastructures import SortedDict
from compressor.exceptions import ParserError
from compressor.parser import ParserBase
class HtmlParser(ParserBase, HTMLParser):
def __init__(self, content):
HTMLParser.__init__(self)
self.content = content
self._css_elems = []
self._js_elems = []
self._current_tag = None
try:
self.feed(self.content)
self.close()
except Exception, err:
raise ParserError("Error while initializing HtmlParser: %s" % err)
def handle_starttag(self, tag, attrs):
tag = tag.lower()
if tag in ('style', 'script'):
if tag == 'style':
tags = self._css_elems
elif tag == 'script':
tags = self._js_elems
tags.append({
'tag': tag,
'attrs': attrs,
'attrs_dict': dict(attrs),
'text': ''
})
self._current_tag = tag
elif tag == 'link':
self._css_elems.append({
'tag': tag,
'attrs': attrs,
'attrs_dict': dict(attrs),
'text': None
})
def handle_endtag(self, tag):
if self._current_tag and self._current_tag == tag.lower():
self._current_tag = None
def handle_data(self, data):
if self._current_tag == 'style':
self._css_elems[-1]['text'] = data
elif self._current_tag == 'script':
self._js_elems[-1]['text'] = data
def css_elems(self):
return self._css_elems
def js_elems(self):
return self._js_elems
def elem_name(self, elem):
return elem['tag']
def elem_attribs(self, elem):
return elem['attrs_dict']
def elem_content(self, elem):
return smart_unicode(elem['text'])
def elem_str(self, elem):
tag = {}
tag.update(elem)
tag['attrs'] = ''
if len(elem['attrs']):
tag['attrs'] = ' %s' % ' '.join(['%s="%s"' % (name, value) for name, value in elem['attrs']])
if elem['tag'] == 'link':
return '<%(tag)s%(attrs)s />' % tag
else:
return '<%(tag)s%(attrs)s>%(text)s</%(tag)s>' % tag

10
compressor/parser/lxml.py
View File

@@ -15,6 +15,7 @@ class LxmlParser(ParserBase):
try:
from lxml.html import fromstring, soupparser
from lxml.etree import tostring
self.tostring = tostring
tree = fromstring(content)
try:
ignore = tostring(tree, encoding=unicode)
@@ -43,6 +44,9 @@ class LxmlParser(ParserBase):
return elem.tag
def elem_str(self, elem):
from lxml import etree
return smart_unicode(
etree.tostring(elem, method='html', encoding=unicode))
elem_as_string = smart_unicode(
self.tostring(elem, method='html', encoding=unicode))
if elem.tag == 'link':
# This makes testcases happy
return elem_as_string.replace('>', ' />')
return elem_as_string

2
compressor/settings.py
View File

@@ -12,7 +12,7 @@ class CompressorSettings(AppSettings):
# GET variable that disables compressor e.g. "nocompress"
DEBUG_TOGGLE = "None"
# the backend to use when parsing the JavaScript or Stylesheet files
PARSER = 'compressor.parser.BeautifulSoupParser'
PARSER = 'compressor.parser.AutoSelectParser'
OUTPUT_DIR = 'CACHE'
STORAGE = 'compressor.storage.CompressorFileStorage'

49
compressor/tests/tests.py
View File

@@ -15,6 +15,11 @@ try:
except ImportError:
html5lib = None
try:
from BeautifulSoup import BeautifulSoup
except ImportError:
BeautifulSoup = None
from django.core.cache.backends import dummy
from django.core.files.storage import get_storage_class
from django.template import Template, Context, TemplateSyntaxError
@@ -31,6 +36,7 @@ from compressor.utils import find_command
class CompressorTestCase(TestCase):
def setUp(self):
self.maxDiff = None
settings.COMPRESS_ENABLED = True
settings.COMPRESS_PRECOMPILERS = {}
settings.COMPRESS_DEBUG_TOGGLE = 'nocompress'
@@ -136,29 +142,25 @@ class CompressorTestCase(TestCase):
finally:
settings.COMPRESS_OUTPUT_DIR = old_output_dir
class LxmlCompressorTestCase(CompressorTestCase):
def test_css_split(self):
out = [
('file', os.path.join(settings.COMPRESS_ROOT, u'css/one.css'), u'<link rel="stylesheet" href="/media/css/one.css" type="text/css" charset="utf-8">'),
('hunk', u'p { border:5px solid green;}', u'<style type="text/css">p { border:5px solid green;}</style>'),
('file', os.path.join(settings.COMPRESS_ROOT, u'css/two.css'), u'<link rel="stylesheet" href="/media/css/two.css" type="text/css" charset="utf-8">'),
]
split = self.css_node.split_contents()
split = [(x[0], x[1], self.css_node.parser.elem_str(x[2])) for x in split]
self.assertEqual(out, split)
class ParserTestCase(object):
def setUp(self):
self.old_parser = settings.COMPRESS_PARSER
settings.COMPRESS_PARSER = 'compressor.parser.LxmlParser'
super(LxmlCompressorTestCase, self).setUp()
settings.COMPRESS_PARSER = self.parser_cls
super(ParserTestCase, self).setUp()
def tearDown(self):
settings.COMPRESS_PARSER = self.old_parser
LxmlCompressorTestCase = skipIf(lxml is None, 'lxml not found')(LxmlCompressorTestCase)
class Html5LibCompressorTesCase(CompressorTestCase):
class LxmlParserTests(ParserTestCase, CompressorTestCase):
parser_cls = 'compressor.parser.LxmlParser'
LxmlParserTests = skipIf(lxml is None, 'lxml not found')(LxmlParserTests)
class Html5LibParserTests(ParserTestCase, CompressorTestCase):
parser_cls = 'compressor.parser.Html5LibParser'
def test_css_split(self):
out = [
@@ -178,14 +180,19 @@ class Html5LibCompressorTesCase(CompressorTestCase):
split = [(x[0], x[1], self.js_node.parser.elem_str(x[2])) for x in split]
self.assertEqual(out, split)
def setUp(self):
self.old_parser = settings.COMPRESS_PARSER
settings.COMPRESS_PARSER = 'compressor.parser.Html5LibParser'
super(Html5LibCompressorTesCase, self).setUp()
Html5LibParserTests = skipIf(
html5lib is None, 'html5lib not found')(Html5LibParserTests)
def tearDown(self):
settings.COMPRESS_PARSER = self.old_parser
Html5LibCompressorTesCase = skipIf(html5lib is None, 'html5lib not found')(Html5LibCompressorTesCase)
class BeautifulSoupParserTests(ParserTestCase, CompressorTestCase):
parser_cls = 'compressor.parser.BeautifulSoupParser'
BeautifulSoupParserTests = skipIf(
BeautifulSoup is None, 'BeautifulSoup not found')(BeautifulSoupParserTests)
class HtmlParserTests(ParserTestCase, CompressorTestCase):
parser_cls = 'compressor.parser.HtmlParser'
class CssAbsolutizingTestCase(TestCase):

20
docs/installation.txt
View File

@@ -35,10 +35,10 @@ Installation
Dependencies
------------
BeautifulSoup_
^^^^^^^^^^^^^^
BeautifulSoup_ (optional)
^^^^^^^^^^^^^^^^^^^^^^^^^
for the default :ref:`parser <compress_parser>`
for the :ref:`parser <compress_parser>`
``compressor.parser.BeautifulSoupParser``::
pip install BeautifulSoup
@@ -46,16 +46,15 @@ for the default :ref:`parser <compress_parser>`
lxml_ (optional)
^^^^^^^^^^^^^^^^
for the optional :ref:`parser <compress_parser>`
``compressor.parser.LxmlParser``, also requires libxml2_::
for the :ref:`parser <compress_parser>` ``compressor.parser.LxmlParser``,
also requires libxml2_::
STATIC_DEPS=true pip install lxml
html5lib_ (optional)
^^^^^^^^^^^^^^^^^^^^
for the optional :ref:`parser <compress_parser>`
``compressor.parser.Html5LibParser``::
for the :ref:`parser <compress_parser>` ``compressor.parser.Html5LibParser``::
pip install html5lib
@@ -63,10 +62,3 @@ for the optional :ref:`parser <compress_parser>`
.. _lxml: http://codespeak.net/lxml/
.. _libxml2: http://xmlsoft.org/
.. _html5lib: http://code.google.com/p/html5lib/
Deprecation
-----------
This section lists features and settings that are deprecated or removed
in newer versions of Django Compressor.

18
docs/settings.txt
View File

@@ -164,13 +164,25 @@ Django Compressor ships with one additional storage backend:
COMPRESS_PARSER
^^^^^^^^^^^^^^^
:Default: ``'compressor.parser.BeautifulSoupParser'``
:Default: ``'compressor.parser.AutoSelectParser'``
The backend to use when parsing the JavaScript or Stylesheet files. The
``AutoSelectParser`` picks the ``lxml`` based parser when available, and falls
back to ``HtmlParser`` if ``lxml`` is not available.
``LxmlParser`` is the fastest available parser, but ``HtmlParser`` is not much
slower. ``AutoSelectParser`` adds a slight overhead, but in most cases it
won't be necesarry to change the default parser.
The other two included parsers are considerably slower and should only be
used if absolutely necessary.
The backend to use when parsing the JavaScript or Stylesheet files.
The backends included in Django Compressor:
- ``compressor.parser.BeautifulSoupParser``
- ``compressor.parser.AutoSelectParser``
- ``compressor.parser.LxmlParser``
- ``compressor.parser.HtmlParser``
- ``compressor.parser.BeautifulSoupParser``
- ``compressor.parser.Html5LibParser``
See :ref:`dependencies` for more info about the packages you need

3
setup.py
View File

@@ -111,9 +111,6 @@ setup(
author_email = 'jannis@leidel.info',
packages = find_packages(),
package_data = find_package_data('compressor', only_in_packages=False),
install_requires = [
'BeautifulSoup',
],
classifiers = [
'Development Status :: 4 - Beta',
'Framework :: Django',