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annotate planemo/lib/python3.7/site-packages/lxml/html/clean.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1
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1 # cython: language_level=3str
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2
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3 """A cleanup tool for HTML.
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4
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5 Removes unwanted tags and content. See the `Cleaner` class for
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6 details.
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7 """
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8
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9 from __future__ import absolute_import
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10
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11 import re
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12 import copy
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13 try:
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14 from urlparse import urlsplit
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15 from urllib import unquote_plus
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16 except ImportError:
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17 # Python 3
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18 from urllib.parse import urlsplit, unquote_plus
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19 from lxml import etree
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20 from lxml.html import defs
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21 from lxml.html import fromstring, XHTML_NAMESPACE
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22 from lxml.html import xhtml_to_html, _transform_result
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23
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24 try:
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25 unichr
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26 except NameError:
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27 # Python 3
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28 unichr = chr
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29 try:
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30 unicode
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31 except NameError:
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32 # Python 3
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33 unicode = str
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34 try:
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35 basestring
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36 except NameError:
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37 basestring = (str, bytes)
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38
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39
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40 __all__ = ['clean_html', 'clean', 'Cleaner', 'autolink', 'autolink_html',
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41 'word_break', 'word_break_html']
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42
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43 # Look at http://code.sixapart.com/trac/livejournal/browser/trunk/cgi-bin/cleanhtml.pl
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44 # Particularly the CSS cleaning; most of the tag cleaning is integrated now
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45 # I have multiple kinds of schemes searched; but should schemes be
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46 # whitelisted instead?
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47 # max height?
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48 # remove images? Also in CSS? background attribute?
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49 # Some way to whitelist object, iframe, etc (e.g., if you want to
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50 # allow *just* embedded YouTube movies)
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51 # Log what was deleted and why?
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52 # style="behavior: ..." might be bad in IE?
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53 # Should we have something for just <meta http-equiv>? That's the worst of the
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54 # metas.
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55 # UTF-7 detections? Example:
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56 # <HEAD><META HTTP-EQUIV="CONTENT-TYPE" CONTENT="text/html; charset=UTF-7"> </HEAD>+ADw-SCRIPT+AD4-alert('XSS');+ADw-/SCRIPT+AD4-
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57 # you don't always have to have the charset set, if the page has no charset
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58 # and there's UTF7-like code in it.
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59 # Look at these tests: http://htmlpurifier.org/live/smoketests/xssAttacks.php
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60
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61
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62 # This is an IE-specific construct you can have in a stylesheet to
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63 # run some Javascript:
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64 _css_javascript_re = re.compile(
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65 r'expression\s*\(.*?\)', re.S|re.I)
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66
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67 # Do I have to worry about @\nimport?
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68 _css_import_re = re.compile(
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69 r'@\s*import', re.I)
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70
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71 # All kinds of schemes besides just javascript: that can cause
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72 # execution:
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73 _is_image_dataurl = re.compile(
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74 r'^data:image/.+;base64', re.I).search
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75 _is_possibly_malicious_scheme = re.compile(
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76 r'(?:javascript|jscript|livescript|vbscript|data|about|mocha):',
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77 re.I).search
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78 def _is_javascript_scheme(s):
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79 if _is_image_dataurl(s):
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80 return None
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81 return _is_possibly_malicious_scheme(s)
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82
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83 _substitute_whitespace = re.compile(r'[\s\x00-\x08\x0B\x0C\x0E-\x19]+').sub
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84 # FIXME: should data: be blocked?
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85
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86 # FIXME: check against: http://msdn2.microsoft.com/en-us/library/ms537512.aspx
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87 _conditional_comment_re = re.compile(
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88 r'\[if[\s\n\r]+.*?][\s\n\r]*>', re.I|re.S)
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89
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90 _find_styled_elements = etree.XPath(
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91 "descendant-or-self::*[@style]")
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92
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93 _find_external_links = etree.XPath(
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94 ("descendant-or-self::a [normalize-space(@href) and substring(normalize-space(@href),1,1) != '#'] |"
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95 "descendant-or-self::x:a[normalize-space(@href) and substring(normalize-space(@href),1,1) != '#']"),
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96 namespaces={'x':XHTML_NAMESPACE})
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97
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98
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99 class Cleaner(object):
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100 """
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101 Instances cleans the document of each of the possible offending
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102 elements. The cleaning is controlled by attributes; you can
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103 override attributes in a subclass, or set them in the constructor.
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104
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105 ``scripts``:
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106 Removes any ``<script>`` tags.
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107
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108 ``javascript``:
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109 Removes any Javascript, like an ``onclick`` attribute. Also removes stylesheets
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110 as they could contain Javascript.
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111
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112 ``comments``:
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113 Removes any comments.
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114
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115 ``style``:
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116 Removes any style tags.
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117
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118 ``inline_style``
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119 Removes any style attributes. Defaults to the value of the ``style`` option.
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120
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121 ``links``:
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122 Removes any ``<link>`` tags
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123
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124 ``meta``:
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125 Removes any ``<meta>`` tags
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126
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127 ``page_structure``:
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128 Structural parts of a page: ``<head>``, ``<html>``, ``<title>``.
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129
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130 ``processing_instructions``:
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131 Removes any processing instructions.
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132
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133 ``embedded``:
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134 Removes any embedded objects (flash, iframes)
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135
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136 ``frames``:
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137 Removes any frame-related tags
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138
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139 ``forms``:
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140 Removes any form tags
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141
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142 ``annoying_tags``:
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143 Tags that aren't *wrong*, but are annoying. ``<blink>`` and ``<marquee>``
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144
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145 ``remove_tags``:
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146 A list of tags to remove. Only the tags will be removed,
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147 their content will get pulled up into the parent tag.
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148
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149 ``kill_tags``:
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150 A list of tags to kill. Killing also removes the tag's content,
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151 i.e. the whole subtree, not just the tag itself.
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152
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153 ``allow_tags``:
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154 A list of tags to include (default include all).
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155
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156 ``remove_unknown_tags``:
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157 Remove any tags that aren't standard parts of HTML.
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158
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159 ``safe_attrs_only``:
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160 If true, only include 'safe' attributes (specifically the list
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161 from the feedparser HTML sanitisation web site).
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162
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163 ``safe_attrs``:
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164 A set of attribute names to override the default list of attributes
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165 considered 'safe' (when safe_attrs_only=True).
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166
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167 ``add_nofollow``:
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168 If true, then any <a> tags will have ``rel="nofollow"`` added to them.
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169
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170 ``host_whitelist``:
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171 A list or set of hosts that you can use for embedded content
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172 (for content like ``<object>``, ``<link rel="stylesheet">``, etc).
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173 You can also implement/override the method
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174 ``allow_embedded_url(el, url)`` or ``allow_element(el)`` to
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175 implement more complex rules for what can be embedded.
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176 Anything that passes this test will be shown, regardless of
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177 the value of (for instance) ``embedded``.
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178
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179 Note that this parameter might not work as intended if you do not
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180 make the links absolute before doing the cleaning.
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181
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182 Note that you may also need to set ``whitelist_tags``.
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183
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184 ``whitelist_tags``:
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185 A set of tags that can be included with ``host_whitelist``.
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186 The default is ``iframe`` and ``embed``; you may wish to
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187 include other tags like ``script``, or you may want to
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188 implement ``allow_embedded_url`` for more control. Set to None to
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189 include all tags.
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190
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191 This modifies the document *in place*.
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192 """
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193
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194 scripts = True
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195 javascript = True
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196 comments = True
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197 style = False
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198 inline_style = None
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199 links = True
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200 meta = True
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201 page_structure = True
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202 processing_instructions = True
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203 embedded = True
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204 frames = True
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205 forms = True
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206 annoying_tags = True
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207 remove_tags = None
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208 allow_tags = None
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209 kill_tags = None
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210 remove_unknown_tags = True
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211 safe_attrs_only = True
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212 safe_attrs = defs.safe_attrs
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213 add_nofollow = False
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214 host_whitelist = ()
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215 whitelist_tags = {'iframe', 'embed'}
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216
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217 def __init__(self, **kw):
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218 not_an_attribute = object()
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219 for name, value in kw.items():
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220 default = getattr(self, name, not_an_attribute)
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221 if (default is not None and default is not True and default is not False
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222 and not isinstance(default, (frozenset, set, tuple, list))):
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223 raise TypeError(
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224 "Unknown parameter: %s=%r" % (name, value))
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225 setattr(self, name, value)
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226 if self.inline_style is None and 'inline_style' not in kw:
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227 self.inline_style = self.style
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228
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229 if kw.get("allow_tags"):
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230 if kw.get("remove_unknown_tags"):
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231 raise ValueError("It does not make sense to pass in both "
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232 "allow_tags and remove_unknown_tags")
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233 self.remove_unknown_tags = False
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234
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235 # Used to lookup the primary URL for a given tag that is up for
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236 # removal:
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237 _tag_link_attrs = dict(
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238 script='src',
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239 link='href',
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240 # From: http://java.sun.com/j2se/1.4.2/docs/guide/misc/applet.html
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241 # From what I can tell, both attributes can contain a link:
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242 applet=['code', 'object'],
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243 iframe='src',
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244 embed='src',
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245 layer='src',
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246 # FIXME: there doesn't really seem like a general way to figure out what
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247 # links an <object> tag uses; links often go in <param> tags with values
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248 # that we don't really know. You'd have to have knowledge about specific
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249 # kinds of plugins (probably keyed off classid), and match against those.
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250 ##object=?,
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251 # FIXME: not looking at the action currently, because it is more complex
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252 # than than -- if you keep the form, you should keep the form controls.
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253 ##form='action',
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254 a='href',
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255 )
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256
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257 def __call__(self, doc):
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258 """
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259 Cleans the document.
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260 """
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261 try:
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262 getroot = doc.getroot
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263 except AttributeError:
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264 pass # Element instance
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265 else:
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266 doc = getroot() # ElementTree instance, instead of an element
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267 # convert XHTML to HTML
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268 xhtml_to_html(doc)
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269 # Normalize a case that IE treats <image> like <img>, and that
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270 # can confuse either this step or later steps.
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271 for el in doc.iter('image'):
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272 el.tag = 'img'
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273 if not self.comments:
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274 # Of course, if we were going to kill comments anyway, we don't
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275 # need to worry about this
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276 self.kill_conditional_comments(doc)
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277
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278 kill_tags = set(self.kill_tags or ())
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279 remove_tags = set(self.remove_tags or ())
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280 allow_tags = set(self.allow_tags or ())
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281
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282 if self.scripts:
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283 kill_tags.add('script')
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284 if self.safe_attrs_only:
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285 safe_attrs = set(self.safe_attrs)
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286 for el in doc.iter(etree.Element):
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287 attrib = el.attrib
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288 for aname in attrib.keys():
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289 if aname not in safe_attrs:
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290 del attrib[aname]
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291 if self.javascript:
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292 if not (self.safe_attrs_only and
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293 self.safe_attrs == defs.safe_attrs):
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294 # safe_attrs handles events attributes itself
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295 for el in doc.iter(etree.Element):
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296 attrib = el.attrib
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297 for aname in attrib.keys():
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298 if aname.startswith('on'):
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299 del attrib[aname]
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300 doc.rewrite_links(self._remove_javascript_link,
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301 resolve_base_href=False)
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302 # If we're deleting style then we don't have to remove JS links
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303 # from styles, otherwise...
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304 if not self.inline_style:
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305 for el in _find_styled_elements(doc):
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306 old = el.get('style')
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307 new = _css_javascript_re.sub('', old)
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308 new = _css_import_re.sub('', new)
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309 if self._has_sneaky_javascript(new):
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310 # Something tricky is going on...
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311 del el.attrib['style']
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312 elif new != old:
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313 el.set('style', new)
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314 if not self.style:
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315 for el in list(doc.iter('style')):
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316 if el.get('type', '').lower().strip() == 'text/javascript':
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317 el.drop_tree()
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318 continue
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319 old = el.text or ''
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320 new = _css_javascript_re.sub('', old)
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321 # The imported CSS can do anything; we just can't allow:
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322 new = _css_import_re.sub('', old)
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323 if self._has_sneaky_javascript(new):
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324 # Something tricky is going on...
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325 el.text = '/* deleted */'
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326 elif new != old:
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327 el.text = new
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328 if self.comments:
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329 kill_tags.add(etree.Comment)
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330 if self.processing_instructions:
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331 kill_tags.add(etree.ProcessingInstruction)
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332 if self.style:
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333 kill_tags.add('style')
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334 if self.inline_style:
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335 etree.strip_attributes(doc, 'style')
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336 if self.links:
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337 kill_tags.add('link')
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338 elif self.style or self.javascript:
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339 # We must get rid of included stylesheets if Javascript is not
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340 # allowed, as you can put Javascript in them
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341 for el in list(doc.iter('link')):
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342 if 'stylesheet' in el.get('rel', '').lower():
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343 # Note this kills alternate stylesheets as well
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344 if not self.allow_element(el):
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345 el.drop_tree()
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346 if self.meta:
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347 kill_tags.add('meta')
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348 if self.page_structure:
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349 remove_tags.update(('head', 'html', 'title'))
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350 if self.embedded:
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351 # FIXME: is <layer> really embedded?
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352 # We should get rid of any <param> tags not inside <applet>;
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353 # These are not really valid anyway.
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354 for el in list(doc.iter('param')):
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355 found_parent = False
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356 parent = el.getparent()
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357 while parent is not None and parent.tag not in ('applet', 'object'):
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358 parent = parent.getparent()
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359 if parent is None:
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360 el.drop_tree()
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361 kill_tags.update(('applet',))
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362 # The alternate contents that are in an iframe are a good fallback:
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363 remove_tags.update(('iframe', 'embed', 'layer', 'object', 'param'))
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364 if self.frames:
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365 # FIXME: ideally we should look at the frame links, but
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366 # generally frames don't mix properly with an HTML
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367 # fragment anyway.
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368 kill_tags.update(defs.frame_tags)
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369 if self.forms:
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370 remove_tags.add('form')
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371 kill_tags.update(('button', 'input', 'select', 'textarea'))
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372 if self.annoying_tags:
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373 remove_tags.update(('blink', 'marquee'))
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374
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375 _remove = []
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376 _kill = []
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377 for el in doc.iter():
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378 if el.tag in kill_tags:
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379 if self.allow_element(el):
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380 continue
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381 _kill.append(el)
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diff changeset
382 elif el.tag in remove_tags:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
383 if self.allow_element(el):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
384 continue
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
385 _remove.append(el)
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guerler
parents:
diff changeset
386
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
387 if _remove and _remove[0] == doc:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
388 # We have to drop the parent-most tag, which we can't
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
389 # do. Instead we'll rewrite it:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
390 el = _remove.pop(0)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
391 el.tag = 'div'
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
392 el.attrib.clear()
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
393 elif _kill and _kill[0] == doc:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
394 # We have to drop the parent-most element, which we can't
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
395 # do. Instead we'll clear it:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
396 el = _kill.pop(0)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
397 if el.tag != 'html':
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
398 el.tag = 'div'
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
399 el.clear()
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
400
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
401 _kill.reverse() # start with innermost tags
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
402 for el in _kill:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
403 el.drop_tree()
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
404 for el in _remove:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
405 el.drop_tag()
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
406
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
407 if self.remove_unknown_tags:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
408 if allow_tags:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
409 raise ValueError(
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
410 "It does not make sense to pass in both allow_tags and remove_unknown_tags")
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
411 allow_tags = set(defs.tags)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
412 if allow_tags:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
413 # make sure we do not remove comments/PIs if users want them (which is rare enough)
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guerler
parents:
diff changeset
414 if not self.comments:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
415 allow_tags.add(etree.Comment)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
416 if not self.processing_instructions:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
417 allow_tags.add(etree.ProcessingInstruction)
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guerler
parents:
diff changeset
418
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guerler
parents:
diff changeset
419 bad = []
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
420 for el in doc.iter():
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
421 if el.tag not in allow_tags:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
422 bad.append(el)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
423 if bad:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
424 if bad[0] is doc:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
425 el = bad.pop(0)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
426 el.tag = 'div'
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
427 el.attrib.clear()
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
428 for el in bad:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
429 el.drop_tag()
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
430 if self.add_nofollow:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
431 for el in _find_external_links(doc):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
432 if not self.allow_follow(el):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
433 rel = el.get('rel')
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
434 if rel:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
435 if ('nofollow' in rel
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
436 and ' nofollow ' in (' %s ' % rel)):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
437 continue
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
438 rel = '%s nofollow' % rel
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
439 else:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
440 rel = 'nofollow'
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
441 el.set('rel', rel)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
442
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
443 def allow_follow(self, anchor):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
444 """
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
445 Override to suppress rel="nofollow" on some anchors.
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
446 """
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
447 return False
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
448
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
449 def allow_element(self, el):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
450 """
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
451 Decide whether an element is configured to be accepted or rejected.
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
452
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
453 :param el: an element.
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
454 :return: true to accept the element or false to reject/discard it.
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
455 """
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
456 if el.tag not in self._tag_link_attrs:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
457 return False
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
458 attr = self._tag_link_attrs[el.tag]
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
459 if isinstance(attr, (list, tuple)):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
460 for one_attr in attr:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
461 url = el.get(one_attr)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
462 if not url:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
463 return False
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
464 if not self.allow_embedded_url(el, url):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
465 return False
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
466 return True
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
467 else:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
468 url = el.get(attr)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
469 if not url:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
470 return False
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
471 return self.allow_embedded_url(el, url)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
472
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
473 def allow_embedded_url(self, el, url):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
474 """
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
475 Decide whether a URL that was found in an element's attributes or text
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
476 if configured to be accepted or rejected.
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
477
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
478 :param el: an element.
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
479 :param url: a URL found on the element.
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
480 :return: true to accept the URL and false to reject it.
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
481 """
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
482 if self.whitelist_tags is not None and el.tag not in self.whitelist_tags:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
483 return False
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
484 scheme, netloc, path, query, fragment = urlsplit(url)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
485 netloc = netloc.lower().split(':', 1)[0]
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
486 if scheme not in ('http', 'https'):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
487 return False
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
488 if netloc in self.host_whitelist:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
489 return True
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
490 return False
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
491
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
492 def kill_conditional_comments(self, doc):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
493 """
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
494 IE conditional comments basically embed HTML that the parser
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
495 doesn't normally see. We can't allow anything like that, so
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
496 we'll kill any comments that could be conditional.
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
497 """
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
498 has_conditional_comment = _conditional_comment_re.search
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
499 self._kill_elements(
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
500 doc, lambda el: has_conditional_comment(el.text),
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
501 etree.Comment)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
502
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
503 def _kill_elements(self, doc, condition, iterate=None):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
504 bad = []
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
505 for el in doc.iter(iterate):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
506 if condition(el):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
507 bad.append(el)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
508 for el in bad:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
509 el.drop_tree()
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
510
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
511 def _remove_javascript_link(self, link):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
512 # links like "j a v a s c r i p t:" might be interpreted in IE
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
513 new = _substitute_whitespace('', unquote_plus(link))
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guerler
parents:
diff changeset
514 if _is_javascript_scheme(new):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
515 # FIXME: should this be None to delete?
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guerler
parents:
diff changeset
516 return ''
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guerler
parents:
diff changeset
517 return link
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guerler
parents:
diff changeset
518
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guerler
parents:
diff changeset
519 _substitute_comments = re.compile(r'/\*.*?\*/', re.S).sub
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guerler
parents:
diff changeset
520
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guerler
parents:
diff changeset
521 def _has_sneaky_javascript(self, style):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
522 """
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
523 Depending on the browser, stuff like ``e x p r e s s i o n(...)``
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
524 can get interpreted, or ``expre/* stuff */ssion(...)``. This
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
525 checks for attempt to do stuff like this.
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
526
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
527 Typically the response will be to kill the entire style; if you
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
528 have just a bit of Javascript in the style another rule will catch
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
529 that and remove only the Javascript from the style; this catches
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
530 more sneaky attempts.
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
531 """
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guerler
parents:
diff changeset
532 style = self._substitute_comments('', style)
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guerler
parents:
diff changeset
533 style = style.replace('\\', '')
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
534 style = _substitute_whitespace('', style)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
535 style = style.lower()
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
536 if 'javascript:' in style:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
537 return True
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
538 if 'expression(' in style:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
539 return True
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
540 return False
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guerler
parents:
diff changeset
541
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guerler
parents:
diff changeset
542 def clean_html(self, html):
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guerler
parents:
diff changeset
543 result_type = type(html)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
544 if isinstance(html, basestring):
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guerler
parents:
diff changeset
545 doc = fromstring(html)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
546 else:
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guerler
parents:
diff changeset
547 doc = copy.deepcopy(html)
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guerler
parents:
diff changeset
548 self(doc)
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guerler
parents:
diff changeset
549 return _transform_result(result_type, doc)
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guerler
parents:
diff changeset
550
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guerler
parents:
diff changeset
551 clean = Cleaner()
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guerler
parents:
diff changeset
552 clean_html = clean.clean_html
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guerler
parents:
diff changeset
553
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
554 ############################################################
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
555 ## Autolinking
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
556 ############################################################
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
557
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
558 _link_regexes = [
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
559 re.compile(r'(?P<body>https?://(?P<host>[a-z0-9._-]+)(?:/[/\-_.,a-z0-9%&?;=~]*)?(?:\([/\-_.,a-z0-9%&?;=~]*\))?)', re.I),
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
560 # This is conservative, but autolinking can be a bit conservative:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
561 re.compile(r'mailto:(?P<body>[a-z0-9._-]+@(?P<host>[a-z0-9_.-]+[a-z]))', re.I),
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
562 ]
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
563
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guerler
parents:
diff changeset
564 _avoid_elements = ['textarea', 'pre', 'code', 'head', 'select', 'a']
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guerler
parents:
diff changeset
565
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guerler
parents:
diff changeset
566 _avoid_hosts = [
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
567 re.compile(r'^localhost', re.I),
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
568 re.compile(r'\bexample\.(?:com|org|net)$', re.I),
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
569 re.compile(r'^127\.0\.0\.1$'),
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
570 ]
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guerler
parents:
diff changeset
571
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guerler
parents:
diff changeset
572 _avoid_classes = ['nolink']
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guerler
parents:
diff changeset
573
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guerler
parents:
diff changeset
574 def autolink(el, link_regexes=_link_regexes,
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
575 avoid_elements=_avoid_elements,
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
576 avoid_hosts=_avoid_hosts,
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
577 avoid_classes=_avoid_classes):
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guerler
parents:
diff changeset
578 """
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
579 Turn any URLs into links.
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
580
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
581 It will search for links identified by the given regular
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
582 expressions (by default mailto and http(s) links).
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
583
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
584 It won't link text in an element in avoid_elements, or an element
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
585 with a class in avoid_classes. It won't link to anything with a
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
586 host that matches one of the regular expressions in avoid_hosts
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
587 (default localhost and 127.0.0.1).
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guerler
parents:
diff changeset
588
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
589 If you pass in an element, the element's tail will not be
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
590 substituted, only the contents of the element.
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
591 """
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
592 if el.tag in avoid_elements:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
593 return
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
594 class_name = el.get('class')
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
595 if class_name:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
596 class_name = class_name.split()
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
597 for match_class in avoid_classes:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
598 if match_class in class_name:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
599 return
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
600 for child in list(el):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
601 autolink(child, link_regexes=link_regexes,
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
602 avoid_elements=avoid_elements,
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
603 avoid_hosts=avoid_hosts,
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
604 avoid_classes=avoid_classes)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
605 if child.tail:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
606 text, tail_children = _link_text(
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
607 child.tail, link_regexes, avoid_hosts, factory=el.makeelement)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
608 if tail_children:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
609 child.tail = text
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
610 index = el.index(child)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
611 el[index+1:index+1] = tail_children
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
612 if el.text:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
613 text, pre_children = _link_text(
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
614 el.text, link_regexes, avoid_hosts, factory=el.makeelement)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
615 if pre_children:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
616 el.text = text
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
617 el[:0] = pre_children
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
618
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
619 def _link_text(text, link_regexes, avoid_hosts, factory):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
620 leading_text = ''
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
621 links = []
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
622 last_pos = 0
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
623 while 1:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
624 best_match, best_pos = None, None
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
625 for regex in link_regexes:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
626 regex_pos = last_pos
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
627 while 1:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
628 match = regex.search(text, pos=regex_pos)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
629 if match is None:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
630 break
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
631 host = match.group('host')
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
632 for host_regex in avoid_hosts:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
633 if host_regex.search(host):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
634 regex_pos = match.end()
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
635 break
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
636 else:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
637 break
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
638 if match is None:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
639 continue
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
640 if best_pos is None or match.start() < best_pos:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
641 best_match = match
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
642 best_pos = match.start()
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
643 if best_match is None:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
644 # No more matches
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
645 if links:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
646 assert not links[-1].tail
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
647 links[-1].tail = text
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
648 else:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
649 assert not leading_text
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
650 leading_text = text
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
651 break
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
652 link = best_match.group(0)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
653 end = best_match.end()
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
654 if link.endswith('.') or link.endswith(','):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
655 # These punctuation marks shouldn't end a link
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
656 end -= 1
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
657 link = link[:-1]
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
658 prev_text = text[:best_match.start()]
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
659 if links:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
660 assert not links[-1].tail
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
661 links[-1].tail = prev_text
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
662 else:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
663 assert not leading_text
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
664 leading_text = prev_text
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
665 anchor = factory('a')
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
666 anchor.set('href', link)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
667 body = best_match.group('body')
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
668 if not body:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
669 body = link
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
670 if body.endswith('.') or body.endswith(','):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
671 body = body[:-1]
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
672 anchor.text = body
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
673 links.append(anchor)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
674 text = text[end:]
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
675 return leading_text, links
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
676
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
677 def autolink_html(html, *args, **kw):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
678 result_type = type(html)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
679 if isinstance(html, basestring):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
680 doc = fromstring(html)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
681 else:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
682 doc = copy.deepcopy(html)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
683 autolink(doc, *args, **kw)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
684 return _transform_result(result_type, doc)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
685
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
686 autolink_html.__doc__ = autolink.__doc__
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
687
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
688 ############################################################
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
689 ## Word wrapping
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
690 ############################################################
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
691
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
692 _avoid_word_break_elements = ['pre', 'textarea', 'code']
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
693 _avoid_word_break_classes = ['nobreak']
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
694
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
695 def word_break(el, max_width=40,
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
696 avoid_elements=_avoid_word_break_elements,
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
697 avoid_classes=_avoid_word_break_classes,
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
698 break_character=unichr(0x200b)):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
699 """
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
700 Breaks any long words found in the body of the text (not attributes).
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
701
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
702 Doesn't effect any of the tags in avoid_elements, by default
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
703 ``<textarea>`` and ``<pre>``
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
704
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
705 Breaks words by inserting &#8203;, which is a unicode character
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
706 for Zero Width Space character. This generally takes up no space
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
707 in rendering, but does copy as a space, and in monospace contexts
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
708 usually takes up space.
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
709
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
710 See http://www.cs.tut.fi/~jkorpela/html/nobr.html for a discussion
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
711 """
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
712 # Character suggestion of &#8203 comes from:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
713 # http://www.cs.tut.fi/~jkorpela/html/nobr.html
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
714 if el.tag in _avoid_word_break_elements:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
715 return
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
716 class_name = el.get('class')
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
717 if class_name:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
718 dont_break = False
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
719 class_name = class_name.split()
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
720 for avoid in avoid_classes:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
721 if avoid in class_name:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
722 dont_break = True
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
723 break
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
724 if dont_break:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
725 return
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
726 if el.text:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
727 el.text = _break_text(el.text, max_width, break_character)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
728 for child in el:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
729 word_break(child, max_width=max_width,
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
730 avoid_elements=avoid_elements,
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
731 avoid_classes=avoid_classes,
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
732 break_character=break_character)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
733 if child.tail:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
734 child.tail = _break_text(child.tail, max_width, break_character)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
735
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
736 def word_break_html(html, *args, **kw):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
737 result_type = type(html)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
738 doc = fromstring(html)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
739 word_break(doc, *args, **kw)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
740 return _transform_result(result_type, doc)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
741
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
742 def _break_text(text, max_width, break_character):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
743 words = text.split()
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
744 for word in words:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
745 if len(word) > max_width:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
746 replacement = _insert_break(word, max_width, break_character)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
747 text = text.replace(word, replacement)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
748 return text
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
749
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
750 _break_prefer_re = re.compile(r'[^a-z]', re.I)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
751
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
752 def _insert_break(word, width, break_character):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
753 orig_word = word
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
754 result = ''
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
755 while len(word) > width:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
756 start = word[:width]
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
757 breaks = list(_break_prefer_re.finditer(start))
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
758 if breaks:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
759 last_break = breaks[-1]
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
760 # Only walk back up to 10 characters to find a nice break:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
761 if last_break.end() > width-10:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
762 # FIXME: should the break character be at the end of the
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
763 # chunk, or the beginning of the next chunk?
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
764 start = word[:last_break.end()]
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
765 result += start + break_character
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
766 word = word[len(start):]
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
767 result += word
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
768 return result
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
769