Mercurial > repos > shellac > sam_consensus_v3

annotate env/lib/python3.9/site-packages/pip/_vendor/html5lib/serializer.py @ 0:4f3585e2f14b draft default tip

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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author shellac
date Mon, 22 Mar 2021 18:12:50 +0000
parents
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Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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0
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1 from __future__ import absolute_import, division, unicode_literals
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2 from pip._vendor.six import text_type
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3
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4 import re
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5
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6 from codecs import register_error, xmlcharrefreplace_errors
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7
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8 from .constants import voidElements, booleanAttributes, spaceCharacters
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9 from .constants import rcdataElements, entities, xmlEntities
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10 from . import treewalkers, _utils
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11 from xml.sax.saxutils import escape
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12
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13 _quoteAttributeSpecChars = "".join(spaceCharacters) + "\"'=<>`"
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14 _quoteAttributeSpec = re.compile("[" + _quoteAttributeSpecChars + "]")
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15 _quoteAttributeLegacy = re.compile("[" + _quoteAttributeSpecChars +
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16 "\x00\x01\x02\x03\x04\x05\x06\x07\x08\t\n"
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17 "\x0b\x0c\r\x0e\x0f\x10\x11\x12\x13\x14\x15"
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18 "\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f"
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19 "\x20\x2f\x60\xa0\u1680\u180e\u180f\u2000"
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20 "\u2001\u2002\u2003\u2004\u2005\u2006\u2007"
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21 "\u2008\u2009\u200a\u2028\u2029\u202f\u205f"
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22 "\u3000]")
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23
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24
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25 _encode_entity_map = {}
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26 _is_ucs4 = len("\U0010FFFF") == 1
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27 for k, v in list(entities.items()):
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28 # skip multi-character entities
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29 if ((_is_ucs4 and len(v) > 1) or
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30 (not _is_ucs4 and len(v) > 2)):
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31 continue
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32 if v != "&":
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33 if len(v) == 2:
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34 v = _utils.surrogatePairToCodepoint(v)
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35 else:
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36 v = ord(v)
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37 if v not in _encode_entity_map or k.islower():
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38 # prefer &lt; over &LT; and similarly for &amp;, &gt;, etc.
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39 _encode_entity_map[v] = k
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40
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41
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42 def htmlentityreplace_errors(exc):
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43 if isinstance(exc, (UnicodeEncodeError, UnicodeTranslateError)):
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44 res = []
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45 codepoints = []
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46 skip = False
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47 for i, c in enumerate(exc.object[exc.start:exc.end]):
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48 if skip:
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49 skip = False
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50 continue
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51 index = i + exc.start
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52 if _utils.isSurrogatePair(exc.object[index:min([exc.end, index + 2])]):
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53 codepoint = _utils.surrogatePairToCodepoint(exc.object[index:index + 2])
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54 skip = True
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55 else:
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56 codepoint = ord(c)
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57 codepoints.append(codepoint)
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58 for cp in codepoints:
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59 e = _encode_entity_map.get(cp)
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60 if e:
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61 res.append("&")
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62 res.append(e)
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63 if not e.endswith(";"):
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64 res.append(";")
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65 else:
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66 res.append("&#x%s;" % (hex(cp)[2:]))
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67 return ("".join(res), exc.end)
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68 else:
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69 return xmlcharrefreplace_errors(exc)
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70
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71
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72 register_error("htmlentityreplace", htmlentityreplace_errors)
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73
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74
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75 def serialize(input, tree="etree", encoding=None, **serializer_opts):
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76 """Serializes the input token stream using the specified treewalker
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77
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78 :arg input: the token stream to serialize
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79
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80 :arg tree: the treewalker to use
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81
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82 :arg encoding: the encoding to use
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83
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84 :arg serializer_opts: any options to pass to the
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85 :py:class:`html5lib.serializer.HTMLSerializer` that gets created
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86
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87 :returns: the tree serialized as a string
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88
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89 Example:
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90
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91 >>> from html5lib.html5parser import parse
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92 >>> from html5lib.serializer import serialize
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93 >>> token_stream = parse('<html><body><p>Hi!</p></body></html>')
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94 >>> serialize(token_stream, omit_optional_tags=False)
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95 '<html><head></head><body><p>Hi!</p></body></html>'
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96
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97 """
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98 # XXX: Should we cache this?
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99 walker = treewalkers.getTreeWalker(tree)
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100 s = HTMLSerializer(**serializer_opts)
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101 return s.render(walker(input), encoding)
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102
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103
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104 class HTMLSerializer(object):
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105
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106 # attribute quoting options
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107 quote_attr_values = "legacy" # be secure by default
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108 quote_char = '"'
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109 use_best_quote_char = True
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110
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111 # tag syntax options
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112 omit_optional_tags = True
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113 minimize_boolean_attributes = True
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114 use_trailing_solidus = False
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115 space_before_trailing_solidus = True
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116
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117 # escaping options
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118 escape_lt_in_attrs = False
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119 escape_rcdata = False
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120 resolve_entities = True
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121
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122 # miscellaneous options
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123 alphabetical_attributes = False
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124 inject_meta_charset = True
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125 strip_whitespace = False
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126 sanitize = False
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127
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128 options = ("quote_attr_values", "quote_char", "use_best_quote_char",
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129 "omit_optional_tags", "minimize_boolean_attributes",
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130 "use_trailing_solidus", "space_before_trailing_solidus",
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131 "escape_lt_in_attrs", "escape_rcdata", "resolve_entities",
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132 "alphabetical_attributes", "inject_meta_charset",
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133 "strip_whitespace", "sanitize")
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134
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135 def __init__(self, **kwargs):
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136 """Initialize HTMLSerializer
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137
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138 :arg inject_meta_charset: Whether or not to inject the meta charset.
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139
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140 Defaults to ``True``.
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141
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142 :arg quote_attr_values: Whether to quote attribute values that don't
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143 require quoting per legacy browser behavior (``"legacy"``), when
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144 required by the standard (``"spec"``), or always (``"always"``).
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145
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146 Defaults to ``"legacy"``.
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147
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148 :arg quote_char: Use given quote character for attribute quoting.
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149
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150 Defaults to ``"`` which will use double quotes unless attribute
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151 value contains a double quote, in which case single quotes are
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152 used.
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153
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154 :arg escape_lt_in_attrs: Whether or not to escape ``<`` in attribute
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155 values.
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156
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157 Defaults to ``False``.
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158
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159 :arg escape_rcdata: Whether to escape characters that need to be
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160 escaped within normal elements within rcdata elements such as
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161 style.
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162
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163 Defaults to ``False``.
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164
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165 :arg resolve_entities: Whether to resolve named character entities that
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166 appear in the source tree. The XML predefined entities &lt; &gt;
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167 &amp; &quot; &apos; are unaffected by this setting.
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168
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169 Defaults to ``True``.
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170
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171 :arg strip_whitespace: Whether to remove semantically meaningless
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172 whitespace. (This compresses all whitespace to a single space
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173 except within ``pre``.)
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174
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175 Defaults to ``False``.
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176
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177 :arg minimize_boolean_attributes: Shortens boolean attributes to give
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178 just the attribute value, for example::
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179
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180 <input disabled="disabled">
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181
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182 becomes::
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183
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184 <input disabled>
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185
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186 Defaults to ``True``.
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187
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188 :arg use_trailing_solidus: Includes a close-tag slash at the end of the
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189 start tag of void elements (empty elements whose end tag is
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190 forbidden). E.g. ``<hr/>``.
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191
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192 Defaults to ``False``.
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193
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194 :arg space_before_trailing_solidus: Places a space immediately before
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195 the closing slash in a tag using a trailing solidus. E.g.
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196 ``<hr />``. Requires ``use_trailing_solidus=True``.
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197
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198 Defaults to ``True``.
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199
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200 :arg sanitize: Strip all unsafe or unknown constructs from output.
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201 See :py:class:`html5lib.filters.sanitizer.Filter`.
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202
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203 Defaults to ``False``.
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204
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205 :arg omit_optional_tags: Omit start/end tags that are optional.
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206
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207 Defaults to ``True``.
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208
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209 :arg alphabetical_attributes: Reorder attributes to be in alphabetical order.
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210
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211 Defaults to ``False``.
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212
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213 """
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214 unexpected_args = frozenset(kwargs) - frozenset(self.options)
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215 if len(unexpected_args) > 0:
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216 raise TypeError("__init__() got an unexpected keyword argument '%s'" % next(iter(unexpected_args)))
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217 if 'quote_char' in kwargs:
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218 self.use_best_quote_char = False
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219 for attr in self.options:
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220 setattr(self, attr, kwargs.get(attr, getattr(self, attr)))
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221 self.errors = []
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222 self.strict = False
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223
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224 def encode(self, string):
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225 assert(isinstance(string, text_type))
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226 if self.encoding:
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227 return string.encode(self.encoding, "htmlentityreplace")
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228 else:
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229 return string
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230
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231 def encodeStrict(self, string):
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232 assert(isinstance(string, text_type))
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233 if self.encoding:
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234 return string.encode(self.encoding, "strict")
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235 else:
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236 return string
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237
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238 def serialize(self, treewalker, encoding=None):
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239 # pylint:disable=too-many-nested-blocks
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240 self.encoding = encoding
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241 in_cdata = False
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242 self.errors = []
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243
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244 if encoding and self.inject_meta_charset:
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245 from .filters.inject_meta_charset import Filter
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246 treewalker = Filter(treewalker, encoding)
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247 # Alphabetical attributes is here under the assumption that none of
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248 # the later filters add or change order of attributes; it needs to be
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249 # before the sanitizer so escaped elements come out correctly
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250 if self.alphabetical_attributes:
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251 from .filters.alphabeticalattributes import Filter
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252 treewalker = Filter(treewalker)
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253 # WhitespaceFilter should be used before OptionalTagFilter
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254 # for maximum efficiently of this latter filter
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255 if self.strip_whitespace:
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256 from .filters.whitespace import Filter
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257 treewalker = Filter(treewalker)
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258 if self.sanitize:
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259 from .filters.sanitizer import Filter
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260 treewalker = Filter(treewalker)
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261 if self.omit_optional_tags:
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262 from .filters.optionaltags import Filter
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263 treewalker = Filter(treewalker)
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264
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265 for token in treewalker:
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266 type = token["type"]
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267 if type == "Doctype":
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268 doctype = "<!DOCTYPE %s" % token["name"]
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269
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270 if token["publicId"]:
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271 doctype += ' PUBLIC "%s"' % token["publicId"]
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272 elif token["systemId"]:
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273 doctype += " SYSTEM"
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274 if token["systemId"]:
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275 if token["systemId"].find('"') >= 0:
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276 if token["systemId"].find("'") >= 0:
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277 self.serializeError("System identifier contains both single and double quote characters")
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278 quote_char = "'"
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279 else:
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280 quote_char = '"'
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281 doctype += " %s%s%s" % (quote_char, token["systemId"], quote_char)
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282
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283 doctype += ">"
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284 yield self.encodeStrict(doctype)
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285
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286 elif type in ("Characters", "SpaceCharacters"):
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287 if type == "SpaceCharacters" or in_cdata:
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288 if in_cdata and token["data"].find("</") >= 0:
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289 self.serializeError("Unexpected </ in CDATA")
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290 yield self.encode(token["data"])
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291 else:
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292 yield self.encode(escape(token["data"]))
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293
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294 elif type in ("StartTag", "EmptyTag"):
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295 name = token["name"]
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296 yield self.encodeStrict("<%s" % name)
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297 if name in rcdataElements and not self.escape_rcdata:
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298 in_cdata = True
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299 elif in_cdata:
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300 self.serializeError("Unexpected child element of a CDATA element")
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301 for (_, attr_name), attr_value in token["data"].items():
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302 # TODO: Add namespace support here
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303 k = attr_name
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304 v = attr_value
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305 yield self.encodeStrict(' ')
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306
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307 yield self.encodeStrict(k)
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308 if not self.minimize_boolean_attributes or \
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309 (k not in booleanAttributes.get(name, tuple()) and
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310 k not in booleanAttributes.get("", tuple())):
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311 yield self.encodeStrict("=")
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312 if self.quote_attr_values == "always" or len(v) == 0:
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313 quote_attr = True
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314 elif self.quote_attr_values == "spec":
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315 quote_attr = _quoteAttributeSpec.search(v) is not None
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316 elif self.quote_attr_values == "legacy":
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317 quote_attr = _quoteAttributeLegacy.search(v) is not None
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318 else:
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319 raise ValueError("quote_attr_values must be one of: "
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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320 "'always', 'spec', or 'legacy'")
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321 v = v.replace("&", "&amp;")
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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322 if self.escape_lt_in_attrs:
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323 v = v.replace("<", "&lt;")
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324 if quote_attr:
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325 quote_char = self.quote_char
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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326 if self.use_best_quote_char:
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diff changeset
327 if "'" in v and '"' not in v:
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328 quote_char = '"'
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329 elif '"' in v and "'" not in v:
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330 quote_char = "'"
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331 if quote_char == "'":
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332 v = v.replace("'", "&#39;")
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333 else:
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334 v = v.replace('"', "&quot;")
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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335 yield self.encodeStrict(quote_char)
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336 yield self.encode(v)
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337 yield self.encodeStrict(quote_char)
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338 else:
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339 yield self.encode(v)
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340 if name in voidElements and self.use_trailing_solidus:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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341 if self.space_before_trailing_solidus:
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342 yield self.encodeStrict(" /")
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343 else:
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344 yield self.encodeStrict("/")
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345 yield self.encode(">")
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346
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347 elif type == "EndTag":
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348 name = token["name"]
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349 if name in rcdataElements:
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350 in_cdata = False
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351 elif in_cdata:
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352 self.serializeError("Unexpected child element of a CDATA element")
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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353 yield self.encodeStrict("</%s>" % name)
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parents:
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354
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parents:
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355 elif type == "Comment":
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parents:
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356 data = token["data"]
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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357 if data.find("--") >= 0:
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parents:
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358 self.serializeError("Comment contains --")
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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359 yield self.encodeStrict("<!--%s-->" % token["data"])
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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360
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parents:
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361 elif type == "Entity":
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parents:
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362 name = token["name"]
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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363 key = name + ";"
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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364 if key not in entities:
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parents:
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365 self.serializeError("Entity %s not recognized" % name)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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366 if self.resolve_entities and key not in xmlEntities:
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parents:
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367 data = entities[key]
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parents:
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368 else:
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parents:
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369 data = "&%s;" % name
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
diff changeset
370 yield self.encodeStrict(data)
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parents:
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371
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parents:
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372 else:
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parents:
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373 self.serializeError(token["data"])
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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374
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parents:
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375 def render(self, treewalker, encoding=None):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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376 """Serializes the stream from the treewalker into a string
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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377
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378 :arg treewalker: the treewalker to serialize
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379
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380 :arg encoding: the string encoding to use
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381
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382 :returns: the serialized tree
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383
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384 Example:
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385
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386 >>> from html5lib import parse, getTreeWalker
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387 >>> from html5lib.serializer import HTMLSerializer
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388 >>> token_stream = parse('<html><body>Hi!</body></html>')
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389 >>> walker = getTreeWalker('etree')
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390 >>> serializer = HTMLSerializer(omit_optional_tags=False)
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391 >>> serializer.render(walker(token_stream))
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392 '<html><head></head><body>Hi!</body></html>'
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393
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394 """
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395 if encoding:
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396 return b"".join(list(self.serialize(treewalker, encoding)))
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397 else:
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398 return "".join(list(self.serialize(treewalker)))
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399
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400 def serializeError(self, data="XXX ERROR MESSAGE NEEDED"):
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401 # XXX The idea is to make data mandatory.
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402 self.errors.append(data)
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403 if self.strict:
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404 raise SerializeError
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405
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406
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407 class SerializeError(Exception):
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408 """Error in serialized tree"""
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409 pass