1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
|
# markdown/searializers.py
#
# Add x/html serialization to Elementree
# Taken from ElementTree 1.3 preview with slight modifications
#
# Copyright (c) 1999-2007 by Fredrik Lundh. All rights reserved.
#
# fredrik@pythonware.com
# https://www.pythonware.com/
#
# --------------------------------------------------------------------
# The ElementTree toolkit is
#
# Copyright (c) 1999-2007 by Fredrik Lundh
#
# By obtaining, using, and/or copying this software and/or its
# associated documentation, you agree that you have read, understood,
# and will comply with the following terms and conditions:
#
# Permission to use, copy, modify, and distribute this software and
# its associated documentation for any purpose and without fee is
# hereby granted, provided that the above copyright notice appears in
# all copies, and that both that copyright notice and this permission
# notice appear in supporting documentation, and that the name of
# Secret Labs AB or the author not be used in advertising or publicity
# pertaining to distribution of the software without specific, written
# prior permission.
#
# SECRET LABS AB AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
# TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANT-
# ABILITY AND FITNESS. IN NO EVENT SHALL SECRET LABS AB OR THE AUTHOR
# BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
# OF THIS SOFTWARE.
# --------------------------------------------------------------------
from xml.etree.ElementTree import ProcessingInstruction
from xml.etree.ElementTree import Comment, ElementTree, QName
import re
__all__ = ['to_html_string', 'to_xhtml_string']
HTML_EMPTY = ("area", "base", "basefont", "br", "col", "frame", "hr",
"img", "input", "isindex", "link", "meta", "param")
RE_AMP = re.compile(r'&(?!(?:\#[0-9]+|\#x[0-9a-f]+|[0-9a-z]+);)', re.I)
try:
HTML_EMPTY = set(HTML_EMPTY)
except NameError: # pragma: no cover
pass
def _raise_serialization_error(text): # pragma: no cover
raise TypeError(
"cannot serialize {!r} (type {})".format(text, type(text).__name__)
)
def _escape_cdata(text):
# escape character data
try:
# it's worth avoiding do-nothing calls for strings that are
# shorter than 500 character, or so. assume that's, by far,
# the most common case in most applications.
if "&" in text:
# Only replace & when not part of an entity
text = RE_AMP.sub('&', text)
if "<" in text:
text = text.replace("<", "<")
if ">" in text:
text = text.replace(">", ">")
return text
except (TypeError, AttributeError): # pragma: no cover
_raise_serialization_error(text)
def _escape_attrib(text):
# escape attribute value
try:
if "&" in text:
# Only replace & when not part of an entity
text = RE_AMP.sub('&', text)
if "<" in text:
text = text.replace("<", "<")
if ">" in text:
text = text.replace(">", ">")
if "\"" in text:
text = text.replace("\"", """)
if "\n" in text:
text = text.replace("\n", " ")
return text
except (TypeError, AttributeError): # pragma: no cover
_raise_serialization_error(text)
def _escape_attrib_html(text):
# escape attribute value
try:
if "&" in text:
# Only replace & when not part of an entity
text = RE_AMP.sub('&', text)
if "<" in text:
text = text.replace("<", "<")
if ">" in text:
text = text.replace(">", ">")
if "\"" in text:
text = text.replace("\"", """)
return text
except (TypeError, AttributeError): # pragma: no cover
_raise_serialization_error(text)
def _serialize_html(write, elem, format):
tag = elem.tag
text = elem.text
if tag is Comment:
write("<!--%s-->" % _escape_cdata(text))
elif tag is ProcessingInstruction:
write("<?%s?>" % _escape_cdata(text))
elif tag is None:
if text:
write(_escape_cdata(text))
for e in elem:
_serialize_html(write, e, format)
else:
namespace_uri = None
if isinstance(tag, QName):
# QNAME objects store their data as a string: `{uri}tag`
if tag.text[:1] == "{":
namespace_uri, tag = tag.text[1:].split("}", 1)
else:
raise ValueError('QName objects must define a tag.')
write("<" + tag)
items = elem.items()
if items:
items = sorted(items) # lexical order
for k, v in items:
if isinstance(k, QName):
# Assume a text only QName
k = k.text
if isinstance(v, QName):
# Assume a text only QName
v = v.text
else:
v = _escape_attrib_html(v)
if k == v and format == 'html':
# handle boolean attributes
write(" %s" % v)
else:
write(' {}="{}"'.format(k, v))
if namespace_uri:
write(' xmlns="%s"' % (_escape_attrib(namespace_uri)))
if format == "xhtml" and tag.lower() in HTML_EMPTY:
write(" />")
else:
write(">")
if text:
if tag.lower() in ["script", "style"]:
write(text)
else:
write(_escape_cdata(text))
for e in elem:
_serialize_html(write, e, format)
if tag.lower() not in HTML_EMPTY:
write("</" + tag + ">")
if elem.tail:
write(_escape_cdata(elem.tail))
def _write_html(root, format="html"):
assert root is not None
data = []
write = data.append
_serialize_html(write, root, format)
return "".join(data)
# --------------------------------------------------------------------
# public functions
def to_html_string(element):
return _write_html(ElementTree(element).getroot(), format="html")
def to_xhtml_string(element):
return _write_html(ElementTree(element).getroot(), format="xhtml")
|
