annotate cagou/core/simple_xhtml.py @ 126:cd99f70ea592

global file reorganisation: - follow common convention by puttin cagou in "cagou" instead of "src/cagou" - added VERSION in cagou with current version - updated dates - moved main executable in /bin - moved buildozer files in root directory - temporary moved platform to assets/platform
author Goffi <goffi@goffi.org>
date Thu, 05 Apr 2018 17:11:21 +0200
parents src/cagou/core/simple_xhtml.py@9909ed7a7a20
children ab3f5173ef5c
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1 #!/usr/bin/python
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2 # -*- coding: utf-8 -*-
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3
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4 # Cagou: desktop/mobile frontend for Salut à Toi XMPP client
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5 # Copyright (C) 2016-2018 Jérôme Poisson (goffi@goffi.org)
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6
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7 # This program is free software: you can redistribute it and/or modify
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8 # it under the terms of the GNU Affero General Public License as published by
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9 # the Free Software Foundation, either version 3 of the License, or
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10 # (at your option) any later version.
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11
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12 # This program is distributed in the hope that it will be useful,
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13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 # GNU Affero General Public License for more details.
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16
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17 # You should have received a copy of the GNU Affero General Public License
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18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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19
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20
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21 from sat.core import log as logging
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22 log = logging.getLogger(__name__)
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23 from kivy.uix.stacklayout import StackLayout
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24 from kivy.uix.label import Label
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25 from kivy.utils import escape_markup
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26 from kivy import properties
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27 from xml.etree import ElementTree as ET
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28 from sat_frontends.tools import css_color, strings as sat_strings
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29 from cagou.core.image import AsyncImage
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30 import webbrowser
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32
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33 class Escape(unicode):
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34 """Class used to mark that a message need to be escaped"""
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35
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36 def __init__(self, text):
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37 super(Escape, self).__init__(text)
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38
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39
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40 class SimpleXHTMLWidgetEscapedText(Label):
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41
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42 def _addUrlMarkup(self, text):
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43 text_elts = []
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44 idx = 0
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45 links = 0
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46 while True:
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47 m = sat_strings.RE_URL.search(text[idx:])
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48 if m is not None:
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49 text_elts.append(escape_markup(m.string[0:m.start()]))
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50 link_key = u'link_' + unicode(links)
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51 url = m.group()
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52 text_elts.append(u'[color=5500ff][ref={link}]{url}[/ref][/color]'.format(
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53 link = link_key,
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54 url = url
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55 ))
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56 if not links:
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57 self.ref_urls = {link_key: url}
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58 else:
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59 self.ref_urls[link_key] = url
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60 links += 1
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61 idx += m.end()
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62 else:
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63 if links:
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64 text_elts.append(escape_markup(text[idx:]))
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65 self.markup = True
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66 self.text = u''.join(text_elts)
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67 break
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68
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69 def on_text(self, instance, text):
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70 # do NOT call the method if self.markup is set
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71 # this would result in infinite loop (because self.text
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72 # is changed if an URL is found, and in this case markup too)
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73 if text and not self.markup:
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74 self._addUrlMarkup(text)
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75
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76 def on_ref_press(self, ref):
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77 url = self.ref_urls[ref]
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78 webbrowser.open(url)
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80
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81 class SimpleXHTMLWidgetText(Label):
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82 pass
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84
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85 class SimpleXHTMLWidgetImage(AsyncImage):
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86 # following properties are desired height/width
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87 # i.e. the ones specified in height/width attributes of <img>
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88 # (or wanted for whatever reason)
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89 # set to 0 to ignore them
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90 target_height = properties.NumericProperty()
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91 target_width = properties.NumericProperty()
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92
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93 def _get_parent_container(self):
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94 """get parent SimpleXHTMLWidget instance
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95
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96 @param warning(bool): if True display a log.error if nothing found
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97 @return (SimpleXHTMLWidget, None): found SimpleXHTMLWidget instance
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98 """
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99 parent = self.parent
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100 while parent and not isinstance(parent, SimpleXHTMLWidget):
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101 parent = parent.parent
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102 if parent is None:
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103 log.error(u"no SimpleXHTMLWidget parent found")
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104 return parent
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105
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106 def _on_source_load(self, value):
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107 # this method is called when image is loaded
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108 super(SimpleXHTMLWidgetImage, self)._on_source_load(value)
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109 if self.parent is not None:
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110 container = self._get_parent_container()
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111 # image is loaded, we need to recalculate size
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112 self.on_container_width(container, container.width)
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113
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114 def on_container_width(self, container, container_width):
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115 """adapt size according to container width
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116
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117 called when parent container (SimpleXHTMLWidget) width change
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118 """
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119 target_size = (self.target_width or self.texture.width, self.target_height or self.texture.height)
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120 padding = container.padding
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121 padding_h = (padding[0] + padding[2]) if len(padding) == 4 else padding[0]
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122 width = container_width - padding_h
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123 if target_size[0] < width:
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124 self.size = target_size
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125 else:
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126 height = width / self.image_ratio
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127 self.size = (width, height)
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128
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129 def on_parent(self, instance, parent):
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130 if parent is not None:
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131 container = self._get_parent_container()
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132 container.bind(width=self.on_container_width)
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133
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134
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135 class SimpleXHTMLWidget(StackLayout):
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136 """widget handling simple XHTML parsing"""
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137 xhtml = properties.StringProperty()
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138 color = properties.ListProperty([1, 1, 1, 1])
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139 # XXX: bold is only used for escaped text
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140 bold = properties.BooleanProperty(False)
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141 content_width = properties.NumericProperty(0)
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142
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143 # text/XHTML input
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144
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145 def on_xhtml(self, instance, xhtml):
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146 """parse xhtml and set content accordingly
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147
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148 if xhtml is an instance of Escape, a Label with not markup
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149 will be used
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150 """
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151 self.clear_widgets()
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152 if isinstance(xhtml, Escape):
58
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153 label = SimpleXHTMLWidgetEscapedText(text=xhtml, color=self.color)
57
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154 self.bind(color=label.setter('color'))
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155 self.bind(bold=label.setter('bold'))
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156 self.add_widget(label)
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157 else:
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158 xhtml = ET.fromstring(xhtml.encode('utf-8'))
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159 self.current_wid = None
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160 self.styles = []
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161 self._callParseMethod(xhtml)
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162
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163 def escape(self, text):
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164 """mark that a text need to be escaped (i.e. no markup)"""
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165 return Escape(text)
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166
58
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167 # sizing
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168
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169 def on_width(self, instance, width):
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170 if len(self.children) == 1:
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171 wid = self.children[0]
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172 if isinstance(wid, Label):
68
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173 # we have simple text
58
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174 try:
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175 full_width = wid._full_width
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176 except AttributeError:
68
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177 # on first time, we need the required size
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178 # for the full text, without width limit
58
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179 wid.size_hint = (None, None)
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180 wid.texture_update()
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181 full_width = wid._full_width = wid.texture_size[0]
68
4a1e1012337e chat: fixed chat messages width
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182
58
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183 if full_width > width:
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184 wid.text_size = width, None
68
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185 wid.width = width
58
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186 else:
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187 wid.text_size = None, None
68
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188 wid.texture_update()
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189 wid.width = wid.texture_size[0]
58
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190 self.content_width = wid.width + self.padding[0] + self.padding[2]
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191 else:
102
20251d926cc2 chat: fixed bad size_hint setting on XHTML
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192 wid.size_hint = (1, None)
58
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193 wid.height = 100
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194 self.content_width = self.width
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195 else:
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196 self._do_complexe_sizing(width)
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197
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198 def _do_complexe_sizing(self, width):
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199 try:
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200 self.splitted
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201 except AttributeError:
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202 # XXX: to make things easier, we split labels in words
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203 log.debug(u"split start")
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204 children = self.children[::-1]
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205 self.clear_widgets()
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206 for child in children:
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207 if isinstance(child, Label):
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208 log.debug(u"label before split: {}".format(child.text))
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209 styles = []
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210 tag = False
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211 new_text = []
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212 current_tag = []
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213 current_value = []
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214 current_wid = self._createText()
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215 value = False
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216 close = False
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217 # we will parse the text and create a new widget
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218 # on each new word (actually each space)
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219 # FIXME: handle '\n' and other white chars
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220 for c in child.text:
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221 if tag:
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222 # we are parsing a markup tag
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diff changeset
223 if c == u']':
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diff changeset
224 current_tag_s = u''.join(current_tag)
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225 current_style = (current_tag_s, u''.join(current_value))
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diff changeset
226 if close:
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diff changeset
227 for idx, s in enumerate(reversed(styles)):
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diff changeset
228 if s[0] == current_tag_s:
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diff changeset
229 del styles[len(styles) - idx - 1]
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diff changeset
230 break
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diff changeset
231 else:
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diff changeset
232 styles.append(current_style)
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diff changeset
233 current_tag = []
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diff changeset
234 current_value = []
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diff changeset
235 tag = False
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diff changeset
236 value = False
7aa2ffff9067 chat: <img/> tag handling first draft:
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diff changeset
237 close = False
7aa2ffff9067 chat: <img/> tag handling first draft:
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diff changeset
238 elif c == u'/':
7aa2ffff9067 chat: <img/> tag handling first draft:
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diff changeset
239 close = True
7aa2ffff9067 chat: <img/> tag handling first draft:
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diff changeset
240 elif c == u'=':
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diff changeset
241 value = True
7aa2ffff9067 chat: <img/> tag handling first draft:
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diff changeset
242 elif value:
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diff changeset
243 current_value.append(c)
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diff changeset
244 else:
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diff changeset
245 current_tag.append(c)
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diff changeset
246 new_text.append(c)
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diff changeset
247 else:
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diff changeset
248 # we are parsing regular text
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249 if c == u'[':
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250 new_text.append(c)
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251 tag = True
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diff changeset
252 elif c == u' ':
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diff changeset
253 # new word, we do a new widget
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diff changeset
254 new_text.append(u' ')
7aa2ffff9067 chat: <img/> tag handling first draft:
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diff changeset
255 for t, v in reversed(styles):
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diff changeset
256 new_text.append(u'[/{}]'.format(t))
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diff changeset
257 current_wid.text = u''.join(new_text)
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diff changeset
258 new_text = []
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diff changeset
259 self.add_widget(current_wid)
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diff changeset
260 log.debug(u"new widget: {}".format(current_wid.text))
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diff changeset
261 current_wid = self._createText()
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diff changeset
262 for t, v in styles:
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diff changeset
263 new_text.append(u'[{tag}{value}]'.format(
7aa2ffff9067 chat: <img/> tag handling first draft:
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diff changeset
264 tag = t,
7aa2ffff9067 chat: <img/> tag handling first draft:
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diff changeset
265 value = u'={}'.format(v) if v else u''))
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diff changeset
266 else:
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diff changeset
267 new_text.append(c)
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diff changeset
268 if current_wid.text:
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diff changeset
269 # we may have a remaining widget after the parsing
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diff changeset
270 close_styles = []
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diff changeset
271 for t, v in reversed(styles):
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diff changeset
272 close_styles.append(u'[/{}]'.format(t))
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diff changeset
273 current_wid.text = u''.join(close_styles)
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diff changeset
274 self.add_widget(current_wid)
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diff changeset
275 log.debug(u"new widget: {}".format(current_wid.text))
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diff changeset
276 else:
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diff changeset
277 # non Label widgets, we just add them
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diff changeset
278 self.add_widget(child)
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diff changeset
279 self.splitted = True
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diff changeset
280 log.debug(u"split OK")
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diff changeset
281
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diff changeset
282 # we now set the content width
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diff changeset
283 # FIXME: for now we just use the full width
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diff changeset
284 self.content_width = width
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diff changeset
285
57
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diff changeset
286 # XHTML parsing methods
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diff changeset
287
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diff changeset
288 def _callParseMethod(self, e):
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diff changeset
289 """call the suitable method to parse the element
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diff changeset
290
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diff changeset
291 self.xhtml_[tag] will be called if it exists, else
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diff changeset
292 self.xhtml_generic will be used
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diff changeset
293 @param e(ET.Element): element to parse
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diff changeset
294 """
a51ea7874e43 chat: XHTML parsing first draft:
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parents: 54
diff changeset
295 try:
a51ea7874e43 chat: XHTML parsing first draft:
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296 method = getattr(self, "xhtml_{}".format(e.tag))
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297 except AttributeError:
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298 log.warning(u"Unhandled XHTML tag: {}".format(e.tag))
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299 method = self.xhtml_generic
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300 method(e)
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301
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302 def _addStyle(self, tag, value=None, append_to_list=True):
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303 """add a markup style to label
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304
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305 @param tag(unicode): markup tag
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306 @param value(unicode): markup value if suitable
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307 @param append_to_list(bool): if True style we be added to self.styles
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308 self.styles is needed to keep track of styles to remove
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309 should most probably be set to True
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310 """
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311 label = self._getLabel()
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312 label.text += u'[{tag}{value}]'.format(
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313 tag = tag,
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314 value = u'={}'.format(value) if value else ''
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315 )
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316 if append_to_list:
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317 self.styles.append((tag, value))
57
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318
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319 def _removeStyle(self, tag, remove_from_list=True):
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320 """remove a markup style from the label
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321
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322 @param tag(unicode): markup tag to remove
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323 @param remove_from_list(bool): if True, remove from self.styles too
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324 should most probably be set to True
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325 """
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326 label = self._getLabel()
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327 label.text += u'[/{tag}]'.format(
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328 tag = tag
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329 )
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330 if remove_from_list:
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331 for rev_idx, style in enumerate(reversed(self.styles)):
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332 if style[0] == tag:
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333 tag_idx = len(self.styles) - 1 - rev_idx
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334 del self.styles[tag_idx]
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335 break
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336
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337 def _getLabel(self):
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338 """get current Label if it exists, or create a new one"""
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339 if not isinstance(self.current_wid, Label):
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340 self._addLabel()
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341 return self.current_wid
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342
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343 def _addLabel(self):
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344 """add a new Label
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345
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346 current styles will be closed and reopened if needed
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347 """
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348 self._closeLabel()
58
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349 self.current_wid = self._createText()
57
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350 for tag, value in self.styles:
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351 self._addStyle(tag, value, append_to_list=False)
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352 self.add_widget(self.current_wid)
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353
58
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354 def _createText(self):
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355 label = SimpleXHTMLWidgetText(color=self.color, markup=True)
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356 self.bind(color=label.setter('color'))
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357 label.bind(texture_size=label.setter('size'))
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358 return label
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359
57
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360 def _closeLabel(self):
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361 """close current style tags in current label
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362
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363 needed when you change label to keep style between
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364 different widgets
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365 """
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366 if isinstance(self.current_wid, Label):
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367 for tag, value in reversed(self.styles):
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368 self._removeStyle(tag, remove_from_list=False)
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369
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370 def _parseCSS(self, e):
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371 """parse CSS found in "style" attribute of element
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372
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373 self._css_styles will be created and contained markup styles added by this method
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374 @param e(ET.Element): element which may have a "style" attribute
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375 """
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376 styles_limit = len(self.styles)
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377 styles = e.attrib['style'].split(u';')
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378 for style in styles:
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diff changeset
379 try:
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380 prop, value = style.split(u':')
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381 except ValueError:
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382 log.warning(u"can't parse style: {}".format(style))
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383 continue
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384 prop = prop.strip().replace(u'-', '_')
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385 value = value.strip()
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386 try:
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387 method = getattr(self, "css_{}".format(prop))
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diff changeset
388 except AttributeError:
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389 log.warning(u"Unhandled CSS: {}".format(prop))
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diff changeset
390 else:
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391 method(e, value)
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392 self._css_styles = self.styles[styles_limit:]
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393
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394 def _closeCSS(self):
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395 """removed CSS styles
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396
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diff changeset
397 styles in self._css_styles will be removed
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398 and the attribute will be deleted
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399 """
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400 for tag, dummy in reversed(self._css_styles):
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diff changeset
401 self._removeStyle(tag)
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402 del self._css_styles
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403
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diff changeset
404 def xhtml_generic(self, elem, style=True, markup=None):
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405 """generic method for adding HTML elements
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406
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diff changeset
407 this method handle content, style and children parsing
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408 @param elem(ET.Element): element to add
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409 @param style(bool): if True handle style attribute (CSS)
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410 @param markup(tuple[unicode, (unicode, None)], None): kivy markup to use
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411 """
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412 # we first add markup and CSS style
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413 if markup is not None:
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diff changeset
414 if isinstance(markup, basestring):
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415 tag, value = markup, None
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416 else:
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417 tag, value = markup
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418 self._addStyle(tag, value)
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419 style_ = 'style' in elem.attrib and style
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420 if style_:
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421 self._parseCSS(elem)
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422
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423 # then content
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424 if elem.text:
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425 self._getLabel().text += escape_markup(elem.text)
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426
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427 # we parse the children
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428 for child in elem:
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429 self._callParseMethod(child)
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430
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431 # closing CSS style and markup
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432 if style_:
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433 self._closeCSS()
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434 if markup is not None:
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435 self._removeStyle(tag)
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436
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diff changeset
437 # and the tail, which is regular text
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diff changeset
438 if elem.tail:
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439 self._getLabel().text += escape_markup(elem.tail)
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440
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441 # method handling XHTML elements
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442
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443 def xhtml_br(self, elem):
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444 label = self._getLabel()
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445 label.text+='\n'
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446 self.xhtml_generic(style=False)
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diff changeset
447
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448 def xhtml_em(self, elem):
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449 self.xhtml_generic(elem, markup='i')
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450
58
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451 def xhtml_img(self, elem):
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452 try:
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453 src = elem.attrib['src']
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454 except KeyError:
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455 log.warning(u"<img> element without src: {}".format(ET.tostring(elem)))
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456 return
59
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457 try:
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458 target_height = int(elem.get(u'height', 0))
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459 except ValueError:
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460 log.warning(u"Can't parse image height: {}".format(elem.get(u'height')))
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461 target_height = 0
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462 try:
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463 target_width = int(elem.get(u'width', 0))
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464 except ValueError:
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465 log.warning(u"Can't parse image width: {}".format(elem.get(u'width')))
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466 target_width = 0
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467
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468 img = SimpleXHTMLWidgetImage(source=src, target_height=target_height, target_width=target_width)
58
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469 self.current_wid = img
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470 self.add_widget(img)
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471
57
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472 def xhtml_p(self, elem):
58
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473 if isinstance(self.current_wid, Label):
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474 self.current_wid.text+="\n\n"
57
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475 self.xhtml_generic(elem)
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476
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477 def xhtml_span(self, elem):
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478 self.xhtml_generic(elem)
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479
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480 def xhtml_strong(self, elem):
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481 self.xhtml_generic(elem, markup='b')
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482
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483 # methods handling CSS properties
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484
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485 def css_color(self, elem, value):
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486 self._addStyle(u"color", css_color.parse(value))
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487
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488 def css_text_decoration(self, elem, value):
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489 if value == u'underline':
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490 log.warning(u"{} not handled yet, it needs Kivy 1.9.2 to be released".format(value))
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491 # FIXME: activate when 1.9.2 is out
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492 # self._addStyle('u')
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493 elif value == u'line-through':
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494 log.warning(u"{} not handled yet, it needs Kivy 1.9.2 to be released".format(value))
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495 # FIXME: activate when 1.9.2 is out
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496 # self._addStyle('s')
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497 else:
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498 log.warning(u"unhandled text decoration: {}".format(value))