8000 Externalized OptionalTagFilter into html5lib.filters.optionaltags. · awesome-python/html5lib-python@2a7e2e0 · GitHub
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Externalized OptionalTagFilter into html5lib.filters.optionaltags.
HTMLSerializer now uses html5lib.filters.whitespace to strip unnecessary whitespace (still disabled by default because it changes the document and could break layout and/or some CSS) --HG-- extra : convert_revision : svn%3Aacbfec75-9323-0410-a652-858a13e371e0/trunk%40691
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-181
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+181
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‎src/filters/optionaltags.py

Lines changed: 175 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,175 @@
1+
import _base
2+
3+
class Filter(_base.Filter):
4+
def slider(self):
5+
previous1 = previous2 = None
6+
for token in self.source:
7+
if previous1 is not None:
8+
yield previous2, previous1, token
9+
previous2 = previous1
10+
previous1 = token
11+
yield previous2, previous1, None
12+
13+
def __iter__(self):
14+
for previous, token, next in self.slider():
15+
type = token["type"]
16+
if type == "StartTag":
17+
if token["data"] or not self.is_optional_start(token["name"], previous, next):
18+
yield token
19+
elif type == "EndTag":
20+
if not self.is_optional_end(token["name"], next):
21+
yield token
22+
else:
23+
yield token
24+
25+
def is_optional_start(self, tagname, previous, next):
26+
type = next and next["type"] or None
27+
if tagname in 'html':
28+
# An html element's start tag may be omitted if the first thing
29+
# inside the html element is not a space character or a comment.
30+
return type not in ("Comment", "SpaceCharacters")
31+
elif tagname == 'head':
32+
# A head element's start tag may be omitted if the first thing
33+
# inside the head element is an element.
34+
return type == "StartTag"
35+
elif tagname == 'body':
36+
# A body element's start tag may be omitted if the first thing
37+
# inside the body element is not a space character or a comment,
38+
# except if the first thing inside the body element is a script
39+
# or style element and the node immediately preceding the body
40+
# element is a head element whose end tag has been omitted.
41+
if type in ("Comment", "SpaceCharacters"):
42+
return False
43+
elif type == "StartTag":
44+
# XXX: we do not look at the preceding event, so we never omit
45+
# the body element's start tag if it's followed by a script or
46+
# a style element.
47+
return next["name"] not in ('script', 'style')
48+
else:
49+
return True
50+
elif tagname == 'colgroup':
51+
# A colgroup element's start tag may be omitted if the first thing
52+
# inside the colgroup element is a col element, and if the element
53+
# is not immediately preceeded by another colgroup element whose
54+
# end tag has been omitted.
55+
if type == "StartTag":
56+
# XXX: we do not look at the preceding event, so instead we never
57+
# omit the colgroup element's end tag when it is immediately
58+
# followed by another colgroup element. See is_optional_end.
59+
return next["name"] == "col"
60+
else:
61+
return False
62+
elif tagname == 'tbody':
63+
# A tbody element's start tag may be omitted if the first thing
64+
# inside the tbody element is a tr element, and if the element is
65+
# not immediately preceeded by a tbody, thead, or tfoot element
66+
# whose end tag has been omitted.
67+
if type == "StartTag":
68+
# omit the thead and tfoot elements' end tag when they are
69+
# immediately followed by a tbody element. See is_optional_end.
70+
if previous and previous['type'] == 'EndTag' and \
71+
previous['name'] in ('tbody','thead','tfoot'):
72+
return False
73+
return next["name"] == 'tr'
74+
else:
75+
return False
76+
return False
77+
78+
def is_optional_end(self, tagname, next):
79+
type = next and next["type"] or None
80+
if tagname in ('html', 'head', 'body'):
81+
# An html element's end tag may be omitted if the html element
82+
# is not immediately followed by a space character or a comment.
83+
return type not in ("Comment", "SpaceCharacters")
84+
elif tagname in ('li', 'optgroup', 'option', 'tr'):
85+
# A li element's end tag may be omitted if the li element is
86+
# immediately followed by another li element or if there is
87+
# no more content in the parent element.
88+
# An optgroup element's end tag may be omitted if the optgroup
89+
# element is immediately followed by another optgroup element,
90+
# or if there is no more content in the parent element.
91+
# An option element's end tag may be omitted if the option
92+
# element is immediately followed by another option element,
93+
# or if there is no more content in the parent element.
94+
# A tr element's end tag may be omitted if the tr element is
95+
# immediately followed by another tr element, or if there is
96+
# no more content in the parent element.
97+
if type == "StartTag":
98+
return next["name"] == tagname
99+
else:
100+
return type == "EndTag" or type is None
101+
elif tagname in ('dt', 'dd'):
102+
# A dt element's end tag may be omitted if the dt element is
103+
# immediately followed by another dt element or a dd element.
104+
# A dd element's end tag may be omitted if the dd element is
105+
# immediately followed by another dd element or a dt element,
106+
# or if there is no more content in the parent element.
107+
if type == "StartTag":
108+
return next["name"] in ('dt', 'dd')
109+
elif tagname == 'dd':
110+
return type == "EndTag" or type is None
111+
else:
112+
return False
113+
elif tagname == 'p':
114+
# A p element's end tag may be omitted if the p element is
115+
# immediately followed by an address, blockquote, dl, fieldset,
116+
# form, h1, h2, h3, h4, h5, h6, hr, menu, ol, p, pre, table,
117+
# or ul element, or if there is no more content in the parent
118+
# element.
119+
if type == "StartTag":
120+
return next["name"] in ('address', 'blockquote', \
121+
'dl', 'fieldset', 'form', 'h1', 'h2', 'h3', 'h4', 'h5', \
122+
'h6', 'hr', 'menu', 'ol', 'p', 'pre', 'table', 'ul')
123+
else:
124+
return type == "EndTag" or type is None
125+
elif tagname == 'colgroup':
126+
# A colgroup element's end tag may be omitted if the colgroup
127+
# element is not immediately followed by a space character or
128+
# a comment.
129+
if type in ("Comment", "SpaceCharacters"):
130+
return False
131+
elif type == "StartTag":
132+
# XXX: we also look for an immediately following colgroup
133+
# element. See is_optional_start.
134+
return next["name"] != 'colgroup'
135+
else:
136+
return True
137+
elif tagname in ('thead', 'tbody'):
138+
# A thead element's end tag may be omitted if the thead element
139+
# is immediately followed by a tbody or tfoot element.
140+
# A tbody element's end tag may be omitted if the tbody element
141+
# is immediately followed by a tbody or tfoot element, or if
142+
# there is no more content in the parent element.
143+
# A tfoot element's end tag may be omitted if the tfoot element
144+
# is immediately followed by a tbody element, or if there is no
145+
# more content in the parent element.
146+
# XXX: we never omit the end tag when the following element is
147+
# a tbody. See is_optional_start.
148+
if type == "StartTag":
149+
return next["name"] in ['tbody', 'tfoot']
150+
elif tagname == 'tbody':
151+
return type == "EndTag" or type is None
152+
else:
153+
return False
154+
elif tagname == 'tfoot':
155+
# A tfoot element's end tag may be omitted if the tfoot element
156+
# is immediately followed by a tbody element, or if there is no
157+
# more content in the parent element.
158+
# XXX: we never omit the end tag when the following element is
159+
# a tbody. See is_optional_start.
160+
if type == "StartTag":
161+
return next["name"] == 'tbody'
162+
else:
163+
return type == "EndTag" or type is None
164+
elif tagname in ('td', 'th'):
165+
# A td element's end tag may be omitted if the td element is
166+
# immediately followed by a td or th element, or if there is
167+
# no more content in the parent element.
168+
# A th element's end tag may be omitted if the th element is
169+
# immediately followed by a td or th element, or if there is
170+
# no more content in the parent element.
171+
if type == "StartTag":
172+
return next["name"] in ('td', 'th')
173+
else:
174+
return type == "EndTag" or type is None
175+
return False

‎src/serializer.py

Lines changed: 6 additions & 181 deletions
Original file line numberDiff line numberDiff line change
@@ -7,6 +7,9 @@
77
import gettext
88
_ = gettext.gettext
99

10+
from filters.whitespace import Filter as WhitespaceFilter
11+
from filters.optionaltags import Filter as OptionalTagFilter
12+
1013
from constants import voidElements, booleanAttributes, spaceCharacters
1114

1215
spaceCharacters = u"".join(spaceCharacters)
@@ -48,183 +51,6 @@ def htmlentityreplace_errors(exc):
4851
def escape_text(text, encoding):
4952
return text.replace("&", "&").encode(encoding, unicode_encode_errors)
5053

51-
class OptionalTagFilter:
52-
def __init__(self, source):
53-
self.source = source
54-
55-
def slider(self):
56-
previous1 = previous2 = None
57-
for token in self.source:
58-
if previous1 is not None:
59-
yield previous2, previous1, token
60-
previous2 = previous1
61-
previous1 = token
62-
yield previous2, previous1, None
63-
64-
def __iter__(self):
65-
for previous, token, next in self.slider():
66-
type = token["type"]
67-
if type == "StartTag":
68-
if token["data"] or not self.is_optional_start(token["name"], previous, next):
69-
yield token
70-
elif type == "EndTag":
71-
if not self.is_optional_end(token["name"], next):
72-
yield token
73-
else:
74-
yield token
75-
76-
def is_optional_start(self, tagname, previous, next):
77-
type = next and next["type"] or None
78-
if tagname in 'html':
79-
# An html element's start tag may be omitted if the first thing
80-
# inside the html element is not a space character or a comment.
81-
return type not in ("Comment", "SpaceCharacters")
82-
elif tagname == 'head':
83-
# A head element's start tag may be omitted if the first thing
84-
# inside the head element is an element.
85-
return type == "StartTag"
86-
elif tagname == 'body':
87-
# A body element's start tag may be omitted if the first thing
88-
# inside the body element is not a space character or a comment,
89-
# except if the first thing inside the body element is a script
90-
# or style element and the node immediately preceding the body
91-
# element is a head element whose end tag has been omitted.
92-
if type in ("Comment", "SpaceCharacters"):
93-
return False
94-
elif type == "StartTag":
95-
# XXX: we do not look at the preceding event, so we never omit
96-
# the body element's start tag if it's followed by a script or
97-
# a style element.
98-
return next["name"] not in ('script', 'style')
99-
else:
100-
return True
101-
elif tagname == 'colgroup':
102-
# A colgroup element's start tag may be omitted if the first thing
103-
# inside the colgroup element is a col element, and if the element
104-
# is not immediately preceeded by another colgroup element whose
105-
# end tag has been omitted.
106-
if type == "StartTag":
107-
# XXX: we do not look at the preceding event, so instead we never
108-
# omit the colgroup element's end tag when it is immediately
109-
# followed by another colgroup element. See is_optional_end.
110-
return next["name"] == "col"
111-
else:
112-
return False
113-
elif tagname == 'tbody':
114-
# A tbody element's start tag may be omitted if the first thing
115-
# inside the tbody element is a tr element, and if the element is
116-
# not immediately preceeded by a tbody, thead, or tfoot element
117-
# whose end tag has been omitted.
118-
if type == "StartTag":
119-
# omit the thead and tfoot elements' end tag when they are
120-
# immediately followed by a tbody element. See is_optional_end.
121-
if previous and previous['type'] == 'EndTag' and \
122-
previous['name'] in ('tbody','thead','tfoot'):
123-
return False
124-
return next["name"] == 'tr'
125-
else:
126-
return False
127-
return False
128-
129-
def is_optional_end(self, tagname, next):
130-
type = next and next["type"] or None
131-
if tagname in ('html', 'head', 'body'):
132-
# An html element's end tag may be omitted if the html element
133-
# is not immediately followed by a space character or a comment.
134-
return type not in ("Comment", "SpaceCharacters")
135-
elif tagname in ('li', 'optgroup', 'option', 'tr'):
136-
# A li element's end tag may be omitted if the li element is
137-
# immediately followed by another li element or if there is
138-
# no more content in the parent element.
139-
# An optgroup element's end tag may be omitted if the optgroup
140-
# element is immediately followed by another optgroup element,
141-
# or if there is no more content in the parent element.
142-
# An option element's end tag may be omitted if the option
143-
# element is immediately followed by another option element,
144-
# or if there is no more content in the parent element.
145-
# A tr element's end tag may be omitted if the tr element is
146-
# immediately followed by another tr element, or if there is
147-
# no more content in the parent element.
148-
if type == "StartTag":
149-
return next["name"] == tagname
150-
else:
151-
return type == "EndTag" or type is None
152-
elif tagname in ('dt', 'dd'):
153-
# A dt element's end tag may be omitted if the dt element is
154-
# immediately followed by another dt element or a dd element.
155-
# A dd element's end tag may be omitted if the dd element is
156-
# immediately followed by another dd element or a dt element,
157-
# or if there is no more content in the parent element.
158-
if type == "StartTag":
159-
return next["name"] in ('dt', 'dd')
160-
elif tagname == 'dd':
161-
return type == "EndTag" or type is None
162-
else:
163-
return False
164-
elif tagname == 'p':
165-
# A p element's end tag may be omitted if the p element is
166-
# immediately followed by an address, blockquote, dl, fieldset,
167-
# form, h1, h2, h3, h4, h5, h6, hr, menu, ol, p, pre, table,
168-
# or ul element, or if there is no more content in the parent
169-
# element.
170-
if type == "StartTag":
171-
return next["name"] in ('address', 'blockquote', \
172-
'dl', 'fieldset', 'form', 'h1', 'h2', 'h3', 'h4', 'h5', \
173-
'h6', 'hr', 'menu', 'ol', 'p', 'pre', 'table', 'ul')
174-
else:
175-
return type == "EndTag" or type is None
176-
elif tagname == 'colgroup':
177-
# A colgroup element's end tag may be omitted if the colgroup
178-
# element is not immediately followed by a space character or
179-
# a comment.
180-
if type in ("Comment", "SpaceCharacters"):
181-
return False
182-
elif type == "StartTag":
183-
# XXX: we also look for an immediately following colgroup
184-
# element. See is_optional_start.
185-
return next["name"] != 'colgroup'
186-
else:
187-
return True
188-
elif tagname in ('thead', 'tbody'):
189-
# A thead element's end tag may be omitted if the thead element
190-
# is immediately followed by a tbody or tfoot element.
191-
# A tbody element's end tag may be omitted if the tbody element
192-
# is immediately followed by a tbody or tfoot element, or if
193-
# there is no more content in the parent element.
194-
# A tfoot element's end tag may be omitted if the tfoot element
195-
# is immediately followed by a tbody element, or if there is no
196-
# more content in the parent element.
197-
# XXX: we never omit the end tag when the following element is
198-
# a tbody. See is_optional_start.
199-
if type == "StartTag":
200-
return next["name"] in ['tbody', 'tfoot']
201-
elif tagname == 'tbody':
202-
return type == "EndTag" or type is None
203-
else:
204-
return False
205-
elif tagname == 'tfoot':
206-
# A tfoot element's end tag may be omitted if the tfoot element
207-
# is immediately followed by a tbody element, or if there is no
208-
# more content in the parent element.
209-
# XXX: we never omit the end tag when the following element is
210-
# a tbody. See is_optional_start.
211-
if type == "StartTag":
212-
return next["name"] == 'tbody'
213-
else:
214-
return type == "EndTag" or type is None
215-
elif tagname in ('td', 'th'):
216-
# A td element's end tag may be omitted if the td element is
217-
# immediately followed by a td or th element, or if there is
218-
# no more content in the parent element.
219-
# A th element's end tag may be omitted if the th element is
220-
# immediately followed by a td or th element, or if there is
221-
# no more content in the parent element.
222-
if type == "StartTag":
223-
return next["name"] in ('td', 'th')
224-
else:
225-
return type == "EndTag" or type is None
226-
return False
227-
22854
class HTMLSerializer(object):
22955
cdata_elements = frozenset(("style", "script", "xmp", "iframe", "noembed", "noframes", "noscript"))
23056

@@ -258,8 +84,10 @@ def serialize(self, treewalker, encoding=None):
25884
self.errors = []
25985
if encoding and self.inject_meta_charset:
26086
treewalker = self.filter_inject_meta_charset(treewalker, encoding)
87+
# XXX: WhitespaceFilter should be used before OptionalTagFilter
88+
# for maximum efficiently of this latter filter
26189
if self.strip_whitespace:
262-
treewalker = self.filter_whitespace(treewalker)
90+
treewalker = WhitespaceFilter(treewalker)
26391
if self.omit_optional_tags:
26492
treewalker = OptionalTagFilter(treewalker)
26593
for token in treewalker:
@@ -387,9 +215,6 @@ def filter_inject_meta_charset(self, treewalker, encoding):
387215
"data": {"charset": encoding}}
388216
yield token
389217

390-
def filter_whitespace(self, treewalker):
391-
raise NotImplementedError
392-
393218
def SerializeError(Exception):
394219
"""Error in serialized tree"""
395220
pass

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