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# Copyright (c) 2017 crocoite contributors
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
"""
HTML helper
"""
from html5lib.treewalkers.base import TreeWalker
from html5lib.filters.base import Filter
from html5lib import constants
# HTML void tags, see https://html.spec.whatwg.org/multipage/syntax.html#void-elements
voidTags = {'area',
'base',
'br',
'col',
'embed',
'hr',
'img',
'input',
'link',
'meta',
'param',
'source',
'track',
'wbr'}
# source: https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes
eventAttributes = {'onabort',
'onautocomplete',
'onautocompleteerror',
'onblur',
'oncancel',
'oncanplay',
'oncanplaythrough',
'onchange',
'onclick',
'onclose',
'oncontextmenu',
'oncuechange',
'ondblclick',
'ondrag',
'ondragend',
'ondragenter',
'ondragexit',
'ondragleave',
'ondragover',
'ondragstart',
'ondrop',
'ondurationchange',
'onemptied',
'onended',
'onerror',
'onfocus',
'oninput',
'oninvalid',
'onkeydown',
'onkeypress',
'onkeyup',
'onload',
'onloadeddata',
'onloadedmetadata',
'onloadstart',
'onmousedown',
'onmouseenter',
'onmouseleave',
'onmousemove',
'onmouseout',
'onmouseover',
'onmouseup',
'onmousewheel',
'onpause',
'onplay',
'onplaying',
'onprogress',
'onratechange',
'onreset',
'onresize',
'onscroll',
'onseeked',
'onseeking',
'onselect',
'onshow',
'onsort',
'onstalled',
'onsubmit',
'onsuspend',
'ontimeupdate',
'ontoggle',
'onvolumechange',
'onwaiting'}
class ChromeTreeWalker (TreeWalker):
"""
Recursive html5lib TreeWalker for Google Chrome method DOM.getDocument
"""
def recurse (self, node):
name = node['nodeName']
if name.startswith ('#'):
if name == '#text':
yield from self.text (node['nodeValue'])
elif name == '#comment':
yield self.comment (node['nodeValue'])
elif name == '#document':
for child in node.get ('children', []):
yield from self.recurse (child)
elif name == '#cdata-section':
# html5lib cannot generate cdata. text should be fine. This
# only happens when using Chrome’s inline XML display.
yield self.text (node['nodeValue'])
else:
assert False, (name, node)
else:
default_namespace = constants.namespaces["html"]
attributes = node.get ('attributes', [])
convertedAttr = {}
for i in range (0, len (attributes), 2):
convertedAttr[(default_namespace, attributes[i])] = attributes[i+1]
children = node.get ('children', [])
if name.lower() in voidTags and not children:
yield from self.emptyTag (default_namespace, name, convertedAttr)
else:
yield self.startTag (default_namespace, name, convertedAttr)
for child in node.get ('children', []):
yield from self.recurse (child)
yield self.endTag ('', name)
def __iter__ (self):
assert self.tree['nodeName'] == '#document'
return self.recurse (self.tree)
def split (self):
"""
Split response returned by DOM.getDocument(pierce=True) into independent documents
"""
def recurse (node):
contentDocument = node.get ('contentDocument')
if contentDocument:
assert contentDocument['nodeName'] == '#document'
yield contentDocument
yield from recurse (contentDocument)
for child in node.get ('children', []):
yield from recurse (child)
if self.tree['nodeName'] == '#document':
yield self.tree
yield from recurse (self.tree)
class StripTagFilter (Filter):
"""
Remove arbitrary tags
"""
def __init__ (self, source, tags):
Filter.__init__ (self, source)
self.tags = set (map (str.lower, tags))
def __iter__(self):
delete = 0
for token in Filter.__iter__(self):
tokenType = token['type']
if tokenType in {'StartTag', 'EmptyTag'}:
if delete > 0 or token['name'].lower () in self.tags:
delete += 1
if delete == 0:
yield token
if tokenType == 'EndTag' and delete > 0:
delete -= 1
class StripAttributeFilter (Filter):
"""
Remove arbitrary HTML attributes
"""
def __init__ (self, source, attributes):
Filter.__init__ (self, source)
self.attributes = set (map (str.lower, attributes))
def __iter__(self):
for token in Filter.__iter__(self):
data = token.get ('data')
if data and token['type'] in {'StartTag', 'EmptyTag'}:
newdata = {}
for (namespace, k), v in data.items ():
if k.lower () not in self.attributes:
newdata[(namespace, k)] = v
token['data'] = newdata
yield token
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