Mercurial > libervia-desktop-kivy
annotate cagou/core/simple_xhtml.py @ 312:772c170b47a9
Python3 port:
/!\ Cagou now runs with Python 3.6+
Port has been done in the same way as for backend (check backend commit b2d067339de3
message for details).
| author | Goffi <goffi@goffi.org> |
|---|---|
| date | Tue, 13 Aug 2019 19:14:22 +0200 |
| parents | 86b1cd8121dd |
| children | 5868a5575e01 |
| rev | line source |
|---|---|
| 22 | 1 #!/usr/bin/python |
| 2 # -*- coding: utf-8 -*- | |
| 3 | |
| 4 # Cagou: desktop/mobile frontend for Salut à Toi XMPP client | |
| 282 | 5 # Copyright (C) 2016-2019 Jérôme Poisson (goffi@goffi.org) |
| 22 | 6 |
| 7 # This program is free software: you can redistribute it and/or modify | |
| 8 # it under the terms of the GNU Affero General Public License as published by | |
| 9 # the Free Software Foundation, either version 3 of the License, or | |
| 10 # (at your option) any later version. | |
| 11 | |
| 12 # This program is distributed in the hope that it will be useful, | |
| 13 # but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 15 # GNU Affero General Public License for more details. | |
| 16 | |
| 17 # You should have received a copy of the GNU Affero General Public License | |
| 18 # along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| 19 | |
| 20 | |
| 21 from sat.core import log as logging | |
| 22 log = logging.getLogger(__name__) | |
| 57 | 23 from kivy.uix.stacklayout import StackLayout |
| 24 from kivy.uix.label import Label | |
| 25 from kivy.utils import escape_markup | |
|
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26 from kivy.metrics import sp |
| 22 | 27 from kivy import properties |
| 57 | 28 from xml.etree import ElementTree as ET |
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29 from sat_frontends.tools import css_color, strings as sat_strings |
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30 from cagou.core.image import AsyncImage |
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31 import webbrowser |
| 22 | 32 |
| 33 | |
| 312 | 34 class Escape(str): |
| 57 | 35 """Class used to mark that a message need to be escaped""" |
| 36 | |
| 37 | |
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38 class SimpleXHTMLWidgetEscapedText(Label): |
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39 |
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40 def on_parent(self, instance, parent): |
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41 if parent is not None: |
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42 self.font_size = parent.font_size |
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43 |
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44 def _addUrlMarkup(self, text): |
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45 text_elts = [] |
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46 idx = 0 |
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47 links = 0 |
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48 while True: |
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49 m = sat_strings.RE_URL.search(text[idx:]) |
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50 if m is not None: |
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51 text_elts.append(escape_markup(m.string[0:m.start()])) |
| 312 | 52 link_key = 'link_' + str(links) |
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53 url = m.group() |
| 312 | 54 text_elts.append('[color=5500ff][ref={link}]{url}[/ref][/color]'.format( |
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55 link = link_key, |
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56 url = url |
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57 )) |
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58 if not links: |
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59 self.ref_urls = {link_key: url} |
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60 else: |
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61 self.ref_urls[link_key] = url |
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62 links += 1 |
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63 idx += m.end() |
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64 else: |
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65 if links: |
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66 text_elts.append(escape_markup(text[idx:])) |
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67 self.markup = True |
| 312 | 68 self.text = ''.join(text_elts) |
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69 break |
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70 |
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71 def on_text(self, instance, text): |
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72 # do NOT call the method if self.markup is set |
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73 # this would result in infinite loop (because self.text |
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74 # is changed if an URL is found, and in this case markup too) |
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75 if text and not self.markup: |
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76 self._addUrlMarkup(text) |
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77 |
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78 def on_ref_press(self, ref): |
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79 url = self.ref_urls[ref] |
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80 webbrowser.open(url) |
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81 |
| 59 | 82 |
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83 class SimpleXHTMLWidgetText(Label): |
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84 |
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85 def on_parent(self, instance, parent): |
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86 self.font_size = parent.font_size |
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87 |
| 59 | 88 |
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89 class SimpleXHTMLWidgetImage(AsyncImage): |
| 59 | 90 # following properties are desired height/width |
| 91 # i.e. the ones specified in height/width attributes of <img> | |
| 92 # (or wanted for whatever reason) | |
| 93 # set to 0 to ignore them | |
| 94 target_height = properties.NumericProperty() | |
| 95 target_width = properties.NumericProperty() | |
| 96 | |
| 97 def _get_parent_container(self): | |
| 98 """get parent SimpleXHTMLWidget instance | |
| 99 | |
| 100 @param warning(bool): if True display a log.error if nothing found | |
| 101 @return (SimpleXHTMLWidget, None): found SimpleXHTMLWidget instance | |
| 102 """ | |
| 103 parent = self.parent | |
| 104 while parent and not isinstance(parent, SimpleXHTMLWidget): | |
| 105 parent = parent.parent | |
| 106 if parent is None: | |
| 312 | 107 log.error("no SimpleXHTMLWidget parent found") |
| 59 | 108 return parent |
| 109 | |
| 110 def _on_source_load(self, value): | |
| 111 # this method is called when image is loaded | |
| 112 super(SimpleXHTMLWidgetImage, self)._on_source_load(value) | |
| 113 if self.parent is not None: | |
| 114 container = self._get_parent_container() | |
| 115 # image is loaded, we need to recalculate size | |
| 116 self.on_container_width(container, container.width) | |
| 117 | |
| 118 def on_container_width(self, container, container_width): | |
| 119 """adapt size according to container width | |
| 120 | |
| 121 called when parent container (SimpleXHTMLWidget) width change | |
| 122 """ | |
| 123 target_size = (self.target_width or self.texture.width, self.target_height or self.texture.height) | |
| 124 padding = container.padding | |
| 125 padding_h = (padding[0] + padding[2]) if len(padding) == 4 else padding[0] | |
| 126 width = container_width - padding_h | |
| 127 if target_size[0] < width: | |
| 128 self.size = target_size | |
| 129 else: | |
| 130 height = width / self.image_ratio | |
| 131 self.size = (width, height) | |
| 132 | |
| 133 def on_parent(self, instance, parent): | |
| 134 if parent is not None: | |
| 135 container = self._get_parent_container() | |
| 136 container.bind(width=self.on_container_width) | |
| 137 | |
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138 |
| 57 | 139 class SimpleXHTMLWidget(StackLayout): |
| 140 """widget handling simple XHTML parsing""" | |
| 141 xhtml = properties.StringProperty() | |
| 142 color = properties.ListProperty([1, 1, 1, 1]) | |
| 143 # XXX: bold is only used for escaped text | |
| 144 bold = properties.BooleanProperty(False) | |
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145 content_width = properties.NumericProperty(0) |
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146 font_size = properties.NumericProperty(sp(14)) |
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147 |
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148 # text/XHTML input |
| 57 | 149 |
| 150 def on_xhtml(self, instance, xhtml): | |
| 151 """parse xhtml and set content accordingly | |
| 152 | |
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153 if xhtml is an instance of Escape, a Label with no markup will be used |
| 57 | 154 """ |
| 155 self.clear_widgets() | |
| 156 if isinstance(xhtml, Escape): | |
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157 label = SimpleXHTMLWidgetEscapedText( |
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158 text=xhtml, color=self.color, bold=self.bold) |
| 57 | 159 self.bind(color=label.setter('color')) |
| 160 self.bind(bold=label.setter('bold')) | |
| 161 self.add_widget(label) | |
| 162 else: | |
| 163 xhtml = ET.fromstring(xhtml.encode('utf-8')) | |
| 164 self.current_wid = None | |
| 165 self.styles = [] | |
| 166 self._callParseMethod(xhtml) | |
| 167 | |
| 168 def escape(self, text): | |
| 169 """mark that a text need to be escaped (i.e. no markup)""" | |
| 170 return Escape(text) | |
| 171 | |
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172 # sizing |
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173 |
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174 def on_width(self, instance, width): |
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175 if len(self.children) == 1: |
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176 wid = self.children[0] |
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177 if isinstance(wid, Label): |
| 68 | 178 # we have simple text |
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179 try: |
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180 full_width = wid._full_width |
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181 except AttributeError: |
| 68 | 182 # on first time, we need the required size |
| 183 # for the full text, without width limit | |
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184 wid.size_hint = (None, None) |
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185 wid.texture_update() |
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186 full_width = wid._full_width = wid.texture_size[0] |
| 68 | 187 |
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188 if full_width > width: |
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189 wid.text_size = width, None |
| 68 | 190 wid.width = width |
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191 else: |
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192 wid.text_size = None, None |
| 68 | 193 wid.texture_update() |
| 194 wid.width = wid.texture_size[0] | |
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195 self.content_width = wid.width + self.padding[0] + self.padding[2] |
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196 else: |
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197 wid.size_hint = (1, None) |
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198 wid.height = 100 |
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199 self.content_width = self.width |
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200 else: |
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201 self._do_complexe_sizing(width) |
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202 |
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203 def _do_complexe_sizing(self, width): |
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204 try: |
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205 self.splitted |
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206 except AttributeError: |
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207 # XXX: to make things easier, we split labels in words |
| 312 | 208 log.debug("split start") |
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209 children = self.children[::-1] |
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210 self.clear_widgets() |
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211 for child in children: |
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212 if isinstance(child, Label): |
| 312 | 213 log.debug("label before split: {}".format(child.text)) |
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214 styles = [] |
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215 tag = False |
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216 new_text = [] |
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217 current_tag = [] |
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218 current_value = [] |
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219 current_wid = self._createText() |
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220 value = False |
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221 close = False |
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222 # we will parse the text and create a new widget |
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223 # on each new word (actually each space) |
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224 # FIXME: handle '\n' and other white chars |
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225 for c in child.text: |
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226 if tag: |
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227 # we are parsing a markup tag |
| 312 | 228 if c == ']': |
| 229 current_tag_s = ''.join(current_tag) | |
| 230 current_style = (current_tag_s, ''.join(current_value)) | |
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231 if close: |
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232 for idx, s in enumerate(reversed(styles)): |
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233 if s[0] == current_tag_s: |
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234 del styles[len(styles) - idx - 1] |
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235 break |
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236 else: |
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237 styles.append(current_style) |
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238 current_tag = [] |
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239 current_value = [] |
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240 tag = False |
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241 value = False |
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242 close = False |
| 312 | 243 elif c == '/': |
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244 close = True |
| 312 | 245 elif c == '=': |
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246 value = True |
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247 elif value: |
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248 current_value.append(c) |
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249 else: |
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250 current_tag.append(c) |
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251 new_text.append(c) |
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252 else: |
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253 # we are parsing regular text |
| 312 | 254 if c == '[': |
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255 new_text.append(c) |
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256 tag = True |
| 312 | 257 elif c == ' ': |
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258 # new word, we do a new widget |
| 312 | 259 new_text.append(' ') |
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260 for t, v in reversed(styles): |
| 312 | 261 new_text.append('[/{}]'.format(t)) |
| 262 current_wid.text = ''.join(new_text) | |
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263 new_text = [] |
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264 self.add_widget(current_wid) |
| 312 | 265 log.debug("new widget: {}".format(current_wid.text)) |
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266 current_wid = self._createText() |
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267 for t, v in styles: |
| 312 | 268 new_text.append('[{tag}{value}]'.format( |
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269 tag = t, |
| 312 | 270 value = '={}'.format(v) if v else '')) |
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271 else: |
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272 new_text.append(c) |
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273 if current_wid.text: |
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274 # we may have a remaining widget after the parsing |
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275 close_styles = [] |
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276 for t, v in reversed(styles): |
| 312 | 277 close_styles.append('[/{}]'.format(t)) |
| 278 current_wid.text = ''.join(close_styles) | |
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279 self.add_widget(current_wid) |
| 312 | 280 log.debug("new widget: {}".format(current_wid.text)) |
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281 else: |
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282 # non Label widgets, we just add them |
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283 self.add_widget(child) |
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284 self.splitted = True |
| 312 | 285 log.debug("split OK") |
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286 |
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287 # we now set the content width |
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288 # FIXME: for now we just use the full width |
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289 self.content_width = width |
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290 |
| 57 | 291 # XHTML parsing methods |
| 292 | |
| 293 def _callParseMethod(self, e): | |
| 294 """call the suitable method to parse the element | |
| 295 | |
| 296 self.xhtml_[tag] will be called if it exists, else | |
| 297 self.xhtml_generic will be used | |
| 298 @param e(ET.Element): element to parse | |
| 299 """ | |
| 300 try: | |
| 301 method = getattr(self, "xhtml_{}".format(e.tag)) | |
| 302 except AttributeError: | |
| 312 | 303 log.warning("Unhandled XHTML tag: {}".format(e.tag)) |
| 57 | 304 method = self.xhtml_generic |
| 305 method(e) | |
| 306 | |
| 307 def _addStyle(self, tag, value=None, append_to_list=True): | |
| 308 """add a markup style to label | |
| 309 | |
| 310 @param tag(unicode): markup tag | |
| 311 @param value(unicode): markup value if suitable | |
| 312 @param append_to_list(bool): if True style we be added to self.styles | |
| 313 self.styles is needed to keep track of styles to remove | |
| 314 should most probably be set to True | |
| 315 """ | |
| 316 label = self._getLabel() | |
| 312 | 317 label.text += '[{tag}{value}]'.format( |
| 57 | 318 tag = tag, |
| 312 | 319 value = '={}'.format(value) if value else '' |
| 57 | 320 ) |
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321 if append_to_list: |
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322 self.styles.append((tag, value)) |
| 57 | 323 |
| 324 def _removeStyle(self, tag, remove_from_list=True): | |
| 325 """remove a markup style from the label | |
| 326 | |
| 327 @param tag(unicode): markup tag to remove | |
| 328 @param remove_from_list(bool): if True, remove from self.styles too | |
| 329 should most probably be set to True | |
| 330 """ | |
| 331 label = self._getLabel() | |
| 312 | 332 label.text += '[/{tag}]'.format( |
| 57 | 333 tag = tag |
| 334 ) | |
| 335 if remove_from_list: | |
| 336 for rev_idx, style in enumerate(reversed(self.styles)): | |
| 337 if style[0] == tag: | |
| 338 tag_idx = len(self.styles) - 1 - rev_idx | |
| 339 del self.styles[tag_idx] | |
| 340 break | |
| 341 | |
| 342 def _getLabel(self): | |
| 343 """get current Label if it exists, or create a new one""" | |
| 344 if not isinstance(self.current_wid, Label): | |
| 345 self._addLabel() | |
| 346 return self.current_wid | |
| 347 | |
| 348 def _addLabel(self): | |
| 349 """add a new Label | |
| 350 | |
| 351 current styles will be closed and reopened if needed | |
| 352 """ | |
| 353 self._closeLabel() | |
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354 self.current_wid = self._createText() |
| 57 | 355 for tag, value in self.styles: |
| 356 self._addStyle(tag, value, append_to_list=False) | |
| 357 self.add_widget(self.current_wid) | |
| 358 | |
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359 def _createText(self): |
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360 label = SimpleXHTMLWidgetText(color=self.color, markup=True) |
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361 self.bind(color=label.setter('color')) |
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362 label.bind(texture_size=label.setter('size')) |
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363 return label |
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364 |
| 57 | 365 def _closeLabel(self): |
| 366 """close current style tags in current label | |
| 367 | |
| 368 needed when you change label to keep style between | |
| 369 different widgets | |
| 370 """ | |
| 371 if isinstance(self.current_wid, Label): | |
| 372 for tag, value in reversed(self.styles): | |
| 373 self._removeStyle(tag, remove_from_list=False) | |
| 374 | |
| 375 def _parseCSS(self, e): | |
| 376 """parse CSS found in "style" attribute of element | |
| 377 | |
| 378 self._css_styles will be created and contained markup styles added by this method | |
| 379 @param e(ET.Element): element which may have a "style" attribute | |
| 380 """ | |
| 381 styles_limit = len(self.styles) | |
| 312 | 382 styles = e.attrib['style'].split(';') |
| 57 | 383 for style in styles: |
| 384 try: | |
| 312 | 385 prop, value = style.split(':') |
| 57 | 386 except ValueError: |
| 312 | 387 log.warning("can't parse style: {}".format(style)) |
| 57 | 388 continue |
| 312 | 389 prop = prop.strip().replace('-', '_') |
| 57 | 390 value = value.strip() |
| 391 try: | |
| 392 method = getattr(self, "css_{}".format(prop)) | |
| 393 except AttributeError: | |
| 312 | 394 log.warning("Unhandled CSS: {}".format(prop)) |
| 57 | 395 else: |
| 396 method(e, value) | |
| 397 self._css_styles = self.styles[styles_limit:] | |
| 398 | |
| 399 def _closeCSS(self): | |
| 400 """removed CSS styles | |
| 401 | |
| 402 styles in self._css_styles will be removed | |
| 403 and the attribute will be deleted | |
| 404 """ | |
| 284 | 405 for tag, __ in reversed(self._css_styles): |
| 57 | 406 self._removeStyle(tag) |
| 407 del self._css_styles | |
| 408 | |
| 409 def xhtml_generic(self, elem, style=True, markup=None): | |
| 410 """generic method for adding HTML elements | |
| 411 | |
| 412 this method handle content, style and children parsing | |
| 413 @param elem(ET.Element): element to add | |
| 414 @param style(bool): if True handle style attribute (CSS) | |
| 415 @param markup(tuple[unicode, (unicode, None)], None): kivy markup to use | |
| 416 """ | |
| 417 # we first add markup and CSS style | |
| 418 if markup is not None: | |
| 312 | 419 if isinstance(markup, str): |
| 57 | 420 tag, value = markup, None |
| 421 else: | |
| 422 tag, value = markup | |
| 423 self._addStyle(tag, value) | |
| 424 style_ = 'style' in elem.attrib and style | |
| 425 if style_: | |
| 426 self._parseCSS(elem) | |
| 427 | |
| 428 # then content | |
| 429 if elem.text: | |
| 430 self._getLabel().text += escape_markup(elem.text) | |
| 431 | |
| 432 # we parse the children | |
| 433 for child in elem: | |
| 434 self._callParseMethod(child) | |
| 435 | |
| 436 # closing CSS style and markup | |
| 437 if style_: | |
| 438 self._closeCSS() | |
| 439 if markup is not None: | |
| 440 self._removeStyle(tag) | |
| 441 | |
| 442 # and the tail, which is regular text | |
| 443 if elem.tail: | |
| 444 self._getLabel().text += escape_markup(elem.tail) | |
| 445 | |
| 446 # method handling XHTML elements | |
| 447 | |
| 448 def xhtml_br(self, elem): | |
| 449 label = self._getLabel() | |
| 450 label.text+='\n' | |
| 451 self.xhtml_generic(style=False) | |
| 452 | |
| 453 def xhtml_em(self, elem): | |
| 454 self.xhtml_generic(elem, markup='i') | |
| 455 | |
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456 def xhtml_img(self, elem): |
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457 try: |
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458 src = elem.attrib['src'] |
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459 except KeyError: |
| 312 | 460 log.warning("<img> element without src: {}".format(ET.tostring(elem))) |
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461 return |
| 59 | 462 try: |
| 312 | 463 target_height = int(elem.get('height', 0)) |
| 59 | 464 except ValueError: |
| 312 | 465 log.warning("Can't parse image height: {}".format(elem.get('height'))) |
| 59 | 466 target_height = 0 |
| 467 try: | |
| 312 | 468 target_width = int(elem.get('width', 0)) |
| 59 | 469 except ValueError: |
| 312 | 470 log.warning("Can't parse image width: {}".format(elem.get('width'))) |
| 59 | 471 target_width = 0 |
| 472 | |
| 473 img = SimpleXHTMLWidgetImage(source=src, target_height=target_height, target_width=target_width) | |
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474 self.current_wid = img |
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475 self.add_widget(img) |
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476 |
| 57 | 477 def xhtml_p(self, elem): |
|
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478 if isinstance(self.current_wid, Label): |
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479 self.current_wid.text+="\n\n" |
| 57 | 480 self.xhtml_generic(elem) |
| 481 | |
| 482 def xhtml_span(self, elem): | |
| 483 self.xhtml_generic(elem) | |
| 484 | |
| 485 def xhtml_strong(self, elem): | |
| 486 self.xhtml_generic(elem, markup='b') | |
| 487 | |
| 488 # methods handling CSS properties | |
| 489 | |
| 490 def css_color(self, elem, value): | |
| 312 | 491 self._addStyle("color", css_color.parse(value)) |
| 57 | 492 |
| 493 def css_text_decoration(self, elem, value): | |
| 312 | 494 if value == 'underline': |
|
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core (simple_xhtml): activated underline and line-through which are now available
Goffi <goffi@goffi.org>
parents:
288
diff
changeset
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495 self._addStyle('u') |
| 312 | 496 elif value == 'line-through': |
|
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86b1cd8121dd
core (simple_xhtml): activated underline and line-through which are now available
Goffi <goffi@goffi.org>
parents:
288
diff
changeset
|
497 self._addStyle('s') |
| 57 | 498 else: |
| 312 | 499 log.warning("unhandled text decoration: {}".format(value)) |