annotate cagou/core/simple_xhtml.py @ 379:1da3c379205b

fixed shebangs
author Goffi <goffi@goffi.org>
date Wed, 29 Jan 2020 10:04:35 +0100
parents 4d660b252487
children efee0e0afb78
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 #!/usr/bin/env python3
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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) 2016-2020 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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21 from xml.etree import ElementTree as ET
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22 from kivy.uix.stacklayout import StackLayout
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23 from kivy.uix.label import Label
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24 from kivy.utils import escape_markup
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25 from kivy.metrics import sp, dp
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26 from kivy import properties
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27 from sat.core import log as logging
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28 from sat_frontends.tools import css_color, strings as sat_strings
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29 from cagou import G
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30 from cagou.core.image import AsyncImage
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31 from cagou.core.constants import Const as C
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34 log = logging.getLogger(__name__)
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36
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37 class Escape(str):
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38 """Class used to mark that a message need to be escaped"""
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41 class SimpleXHTMLWidgetEscapedText(Label):
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42
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43 def on_parent(self, instance, parent):
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44 if parent is not None:
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45 self.font_size = parent.font_size
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46
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47 def _addUrlMarkup(self, text):
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48 text_elts = []
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49 idx = 0
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50 links = 0
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51 while True:
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52 m = sat_strings.RE_URL.search(text[idx:])
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53 if m is not None:
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54 text_elts.append(escape_markup(m.string[0:m.start()]))
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55 link_key = 'link_' + str(links)
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56 url = m.group()
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57 escaped_url = escape_markup(url)
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58 text_elts.append(
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59 f'[color=5500ff][ref={link_key}]{escaped_url}[/ref][/color]')
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60 if not links:
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61 self.ref_urls = {link_key: url}
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62 else:
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63 self.ref_urls[link_key] = url
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64 links += 1
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65 idx += m.end()
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66 else:
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67 if links:
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68 text_elts.append(escape_markup(text[idx:]))
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69 self.markup = True
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70 self.text = ''.join(text_elts)
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71 break
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73 def on_text(self, instance, text):
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74 # do NOT call the method if self.markup is set
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75 # this would result in infinite loop (because self.text
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76 # is changed if an URL is found, and in this case markup too)
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77 if text and not self.markup:
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78 self._addUrlMarkup(text)
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80 def on_ref_press(self, ref):
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81 url = self.ref_urls[ref]
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82 G.local_platform.open_url(url, self)
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84
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85 class SimpleXHTMLWidgetText(Label):
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86
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87 def on_parent(self, instance, parent):
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88 if parent is not None:
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89 self.font_size = parent.font_size
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90
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91
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92 class SimpleXHTMLWidgetImage(AsyncImage):
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93 # following properties are desired height/width
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94 # i.e. the ones specified in height/width attributes of <img>
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95 # (or wanted for whatever reason)
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96 # set to None to ignore them
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97 target_height = properties.NumericProperty(allownone=True)
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98 target_width = properties.NumericProperty(allownone=True)
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99
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100 def __init__(self, **kwargs):
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101 # best calculated size
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102 self._best_width = self._best_height = 100
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103 super().__init__(**kwargs)
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104
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105 def on_texture(self, instance, texture):
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106 """Adapt the size according to max size and target_*"""
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107 if texture is None:
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108 return
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109 max_width, max_height = dp(C.IMG_MAX_WIDTH), dp(C.IMG_MAX_HEIGHT)
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110 width, height = texture.size
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111 if self.target_width:
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112 width = min(width, self.target_width)
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113 if width > max_width:
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114 width = C.IMG_MAX_WIDTH
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115
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116 height = width / self.image_ratio
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117
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118 if self.target_height:
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119 height = min(height, self.target_height)
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120
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121 if height > max_height:
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122 height = max_height
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123 width = height * self.image_ratio
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124
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125 self.width, self.height = self._best_width, self._best_height = width, height
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126
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127 def on_parent(self, instance, parent):
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128 if parent is not None:
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129 parent.bind(width=self.on_parent_width)
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130
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131 def on_parent_width(self, instance, width):
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132 if self._best_width > width:
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133 self.width = width
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134 self.height = width / self.image_ratio
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135 else:
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136 self.width, self.height = self._best_width, self._best_height
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137
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138
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139 class SimpleXHTMLWidget(StackLayout):
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140 """widget handling simple XHTML parsing"""
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141 xhtml = properties.StringProperty()
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142 color = properties.ListProperty([1, 1, 1, 1])
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143 # XXX: bold is only used for escaped text
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144 bold = properties.BooleanProperty(False)
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145 font_size = properties.NumericProperty(sp(14))
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146
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147 # text/XHTML input
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148
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149 def on_xhtml(self, instance, xhtml):
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150 """parse xhtml and set content accordingly
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151
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152 if xhtml is an instance of Escape, a Label with no markup will be used
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153 """
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154 self.clear_widgets()
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155 if isinstance(xhtml, Escape):
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156 label = SimpleXHTMLWidgetEscapedText(
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157 text=xhtml, color=self.color, bold=self.bold)
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158 self.bind(font_size=label.setter('font_size'))
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159 self.bind(color=label.setter('color'))
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160 self.bind(bold=label.setter('bold'))
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161 self.add_widget(label)
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162 else:
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163 xhtml = ET.fromstring(xhtml.encode())
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164 self.current_wid = None
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165 self.styles = []
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166 self._callParseMethod(xhtml)
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167 if len(self.children) > 1:
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168 self._do_split_labels()
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169
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170 def escape(self, text):
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171 """mark that a text need to be escaped (i.e. no markup)"""
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172 return Escape(text)
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173
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174 def _do_split_labels(self):
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175 """Split labels so their content can flow with images"""
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176 # XXX: to make things easier, we split labels in words
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177 log.debug("labels splitting start")
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178 children = self.children[::-1]
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179 self.clear_widgets()
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180 for child in children:
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181 if isinstance(child, Label):
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182 log.debug("label before split: {}".format(child.text))
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183 styles = []
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184 tag = False
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185 new_text = []
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186 current_tag = []
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187 current_value = []
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188 current_wid = self._createText()
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189 value = False
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190 close = False
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191 # we will parse the text and create a new widget
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192 # on each new word (actually each space)
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193 # FIXME: handle '\n' and other white chars
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194 for c in child.text:
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195 if tag:
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196 # we are parsing a markup tag
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197 if c == ']':
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198 current_tag_s = ''.join(current_tag)
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199 current_style = (current_tag_s, ''.join(current_value))
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200 if close:
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201 for idx, s in enumerate(reversed(styles)):
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202 if s[0] == current_tag_s:
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203 del styles[len(styles) - idx - 1]
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204 break
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205 else:
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206 styles.append(current_style)
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207 current_tag = []
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208 current_value = []
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209 tag = False
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210 value = False
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211 close = False
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212 elif c == '/':
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213 close = True
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214 elif c == '=':
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215 value = True
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216 elif value:
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217 current_value.append(c)
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218 else:
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219 current_tag.append(c)
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220 new_text.append(c)
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221 else:
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222 # we are parsing regular text
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223 if c == '[':
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224 new_text.append(c)
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225 tag = True
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226 elif c == ' ':
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227 # new word, we do a new widget
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228 new_text.append(' ')
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229 for t, v in reversed(styles):
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230 new_text.append('[/{}]'.format(t))
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231 current_wid.text = ''.join(new_text)
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232 new_text = []
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233 self.add_widget(current_wid)
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234 log.debug("new widget: {}".format(current_wid.text))
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235 current_wid = self._createText()
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236 for t, v in styles:
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237 new_text.append('[{tag}{value}]'.format(
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238 tag = t,
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239 value = '={}'.format(v) if v else ''))
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240 else:
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241 new_text.append(c)
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242 if current_wid.text:
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243 # we may have a remaining widget after the parsing
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244 close_styles = []
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245 for t, v in reversed(styles):
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246 close_styles.append('[/{}]'.format(t))
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247 current_wid.text = ''.join(close_styles)
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248 self.add_widget(current_wid)
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249 log.debug("new widget: {}".format(current_wid.text))
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250 else:
325
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251 # non Label widgets, we just add them
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252 self.add_widget(child)
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253 self.splitted = True
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254 log.debug("split OK")
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255
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256 # XHTML parsing methods
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257
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258 def _callParseMethod(self, e):
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259 """Call the suitable method to parse the element
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260
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261 self.xhtml_[tag] will be called if it exists, else
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262 self.xhtml_generic will be used
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263 @param e(ET.Element): element to parse
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264 """
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265 try:
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266 method = getattr(self, f"xhtml_{e.tag}")
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267 except AttributeError:
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268 log.warning(f"Unhandled XHTML tag: {e.tag}")
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269 method = self.xhtml_generic
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270 method(e)
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271
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272 def _addStyle(self, tag, value=None, append_to_list=True):
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273 """add a markup style to label
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274
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275 @param tag(unicode): markup tag
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276 @param value(unicode): markup value if suitable
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277 @param append_to_list(bool): if True style we be added to self.styles
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278 self.styles is needed to keep track of styles to remove
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279 should most probably be set to True
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280 """
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281 label = self._getLabel()
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282 label.text += '[{tag}{value}]'.format(
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283 tag = tag,
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284 value = '={}'.format(value) if value else ''
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285 )
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286 if append_to_list:
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287 self.styles.append((tag, value))
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288
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289 def _removeStyle(self, tag, remove_from_list=True):
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290 """remove a markup style from the label
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291
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292 @param tag(unicode): markup tag to remove
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293 @param remove_from_list(bool): if True, remove from self.styles too
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294 should most probably be set to True
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295 """
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296 label = self._getLabel()
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297 label.text += '[/{tag}]'.format(
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298 tag = tag
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299 )
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300 if remove_from_list:
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301 for rev_idx, style in enumerate(reversed(self.styles)):
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302 if style[0] == tag:
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303 tag_idx = len(self.styles) - 1 - rev_idx
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304 del self.styles[tag_idx]
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305 break
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306
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307 def _getLabel(self):
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308 """get current Label if it exists, or create a new one"""
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309 if not isinstance(self.current_wid, Label):
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310 self._addLabel()
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311 return self.current_wid
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312
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313 def _addLabel(self):
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314 """add a new Label
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315
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316 current styles will be closed and reopened if needed
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317 """
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318 self._closeLabel()
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319 self.current_wid = self._createText()
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320 for tag, value in self.styles:
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321 self._addStyle(tag, value, append_to_list=False)
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322 self.add_widget(self.current_wid)
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323
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324 def _createText(self):
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325 label = SimpleXHTMLWidgetText(color=self.color, markup=True)
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326 self.bind(color=label.setter('color'))
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327 label.bind(texture_size=label.setter('size'))
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328 return label
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329
57
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330 def _closeLabel(self):
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331 """close current style tags in current label
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332
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333 needed when you change label to keep style between
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334 different widgets
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335 """
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336 if isinstance(self.current_wid, Label):
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337 for tag, value in reversed(self.styles):
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338 self._removeStyle(tag, remove_from_list=False)
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339
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340 def _parseCSS(self, e):
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341 """parse CSS found in "style" attribute of element
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342
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343 self._css_styles will be created and contained markup styles added by this method
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344 @param e(ET.Element): element which may have a "style" attribute
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345 """
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346 styles_limit = len(self.styles)
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347 styles = e.attrib['style'].split(';')
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348 for style in styles:
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349 try:
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350 prop, value = style.split(':')
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351 except ValueError:
325
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352 log.warning(f"can't parse style: {style}")
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353 continue
312
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354 prop = prop.strip().replace('-', '_')
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355 value = value.strip()
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356 try:
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357 method = getattr(self, f"css_{prop}")
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358 except AttributeError:
325
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359 log.warning(f"Unhandled CSS: {prop}")
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360 else:
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361 method(e, value)
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362 self._css_styles = self.styles[styles_limit:]
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363
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364 def _closeCSS(self):
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365 """removed CSS styles
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366
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367 styles in self._css_styles will be removed
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368 and the attribute will be deleted
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369 """
284
ca4daced4638 misc: replaced "dummy" by "__"
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370 for tag, __ in reversed(self._css_styles):
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371 self._removeStyle(tag)
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372 del self._css_styles
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373
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374 def xhtml_generic(self, elem, style=True, markup=None):
325
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375 """Generic method for adding HTML elements
57
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376
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377 this method handle content, style and children parsing
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378 @param elem(ET.Element): element to add
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379 @param style(bool): if True handle style attribute (CSS)
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380 @param markup(tuple[unicode, (unicode, None)], None): kivy markup to use
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381 """
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382 # we first add markup and CSS style
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383 if markup is not None:
312
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diff changeset
384 if isinstance(markup, str):
57
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385 tag, value = markup, None
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386 else:
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diff changeset
387 tag, value = markup
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388 self._addStyle(tag, value)
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389 style_ = 'style' in elem.attrib and style
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diff changeset
390 if style_:
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391 self._parseCSS(elem)
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392
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393 # then content
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394 if elem.text:
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395 self._getLabel().text += escape_markup(elem.text)
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diff changeset
396
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diff changeset
397 # we parse the children
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diff changeset
398 for child in elem:
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diff changeset
399 self._callParseMethod(child)
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diff changeset
400
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diff changeset
401 # closing CSS style and markup
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402 if style_:
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diff changeset
403 self._closeCSS()
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diff changeset
404 if markup is not None:
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diff changeset
405 self._removeStyle(tag)
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diff changeset
406
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407 # and the tail, which is regular text
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diff changeset
408 if elem.tail:
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409 self._getLabel().text += escape_markup(elem.tail)
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diff changeset
410
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411 # method handling XHTML elements
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diff changeset
412
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diff changeset
413 def xhtml_br(self, elem):
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diff changeset
414 label = self._getLabel()
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diff changeset
415 label.text+='\n'
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416 self.xhtml_generic(style=False)
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diff changeset
417
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418 def xhtml_em(self, elem):
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419 self.xhtml_generic(elem, markup='i')
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diff changeset
420
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diff changeset
421 def xhtml_img(self, elem):
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diff changeset
422 try:
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diff changeset
423 src = elem.attrib['src']
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diff changeset
424 except KeyError:
312
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diff changeset
425 log.warning("<img> element without src: {}".format(ET.tostring(elem)))
58
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diff changeset
426 return
59
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diff changeset
427 try:
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diff changeset
428 target_height = int(elem.get('height', 0))
59
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diff changeset
429 except ValueError:
325
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430 log.warning(f"Can't parse image height: {elem.get('height')}")
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diff changeset
431 target_height = None
59
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diff changeset
432 try:
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433 target_width = int(elem.get('width', 0))
59
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diff changeset
434 except ValueError:
325
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435 log.warning(f"Can't parse image width: {elem.get('width')}")
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diff changeset
436 target_width = None
59
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diff changeset
437
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diff changeset
438 img = SimpleXHTMLWidgetImage(source=src, target_height=target_height, target_width=target_width)
58
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diff changeset
439 self.current_wid = img
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diff changeset
440 self.add_widget(img)
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diff changeset
441
57
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442 def xhtml_p(self, elem):
58
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diff changeset
443 if isinstance(self.current_wid, Label):
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diff changeset
444 self.current_wid.text+="\n\n"
57
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445 self.xhtml_generic(elem)
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446
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447 def xhtml_span(self, elem):
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448 self.xhtml_generic(elem)
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449
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450 def xhtml_strong(self, elem):
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451 self.xhtml_generic(elem, markup='b')
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452
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453 # methods handling CSS properties
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454
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455 def css_color(self, elem, value):
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456 self._addStyle("color", css_color.parse(value))
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457
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458 def css_text_decoration(self, elem, value):
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459 if value == 'underline':
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460 self._addStyle('u')
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461 elif value == 'line-through':
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462 self._addStyle('s')
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463 else:
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464 log.warning("unhandled text decoration: {}".format(value))