Mercurial > libervia-desktop-kivy
annotate cagou/core/simple_xhtml.py @ 209:5e92bc937778
install (buildozer): added READ_EXTERNAL_STORAGE and WRITE_EXTERNAL_STORAGE permissions for file sharing
| author | Goffi <goffi@goffi.org> |
|---|---|
| date | Fri, 25 May 2018 12:06:52 +0200 |
| parents | ab3f5173ef5c |
| children | 1b835bcfa663 |
| rev | line source |
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| 22 | 1 #!/usr/bin/python |
| 2 # -*- coding: utf-8 -*- | |
| 3 | |
| 4 # Cagou: desktop/mobile frontend for Salut à Toi XMPP client | |
| 126 | 5 # Copyright (C) 2016-2018 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 | |
| 57 | 34 class Escape(unicode): |
| 35 """Class used to mark that a message need to be escaped""" | |
| 36 | |
| 37 def __init__(self, text): | |
| 38 super(Escape, self).__init__(text) | |
| 39 | |
| 40 | |
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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 self.font_size = parent.font_size |
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45 |
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46 def _addUrlMarkup(self, text): |
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47 text_elts = [] |
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48 idx = 0 |
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49 links = 0 |
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50 while True: |
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51 m = sat_strings.RE_URL.search(text[idx:]) |
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52 if m is not None: |
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53 text_elts.append(escape_markup(m.string[0:m.start()])) |
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54 link_key = u'link_' + unicode(links) |
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55 url = m.group() |
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56 text_elts.append(u'[color=5500ff][ref={link}]{url}[/ref][/color]'.format( |
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57 link = link_key, |
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58 url = url |
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59 )) |
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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 = u''.join(text_elts) |
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71 break |
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72 |
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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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79 |
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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 webbrowser.open(url) |
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83 |
| 59 | 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 self.font_size = parent.font_size |
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89 |
| 59 | 90 |
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91 class SimpleXHTMLWidgetImage(AsyncImage): |
| 59 | 92 # following properties are desired height/width |
| 93 # i.e. the ones specified in height/width attributes of <img> | |
| 94 # (or wanted for whatever reason) | |
| 95 # set to 0 to ignore them | |
| 96 target_height = properties.NumericProperty() | |
| 97 target_width = properties.NumericProperty() | |
| 98 | |
| 99 def _get_parent_container(self): | |
| 100 """get parent SimpleXHTMLWidget instance | |
| 101 | |
| 102 @param warning(bool): if True display a log.error if nothing found | |
| 103 @return (SimpleXHTMLWidget, None): found SimpleXHTMLWidget instance | |
| 104 """ | |
| 105 parent = self.parent | |
| 106 while parent and not isinstance(parent, SimpleXHTMLWidget): | |
| 107 parent = parent.parent | |
| 108 if parent is None: | |
| 109 log.error(u"no SimpleXHTMLWidget parent found") | |
| 110 return parent | |
| 111 | |
| 112 def _on_source_load(self, value): | |
| 113 # this method is called when image is loaded | |
| 114 super(SimpleXHTMLWidgetImage, self)._on_source_load(value) | |
| 115 if self.parent is not None: | |
| 116 container = self._get_parent_container() | |
| 117 # image is loaded, we need to recalculate size | |
| 118 self.on_container_width(container, container.width) | |
| 119 | |
| 120 def on_container_width(self, container, container_width): | |
| 121 """adapt size according to container width | |
| 122 | |
| 123 called when parent container (SimpleXHTMLWidget) width change | |
| 124 """ | |
| 125 target_size = (self.target_width or self.texture.width, self.target_height or self.texture.height) | |
| 126 padding = container.padding | |
| 127 padding_h = (padding[0] + padding[2]) if len(padding) == 4 else padding[0] | |
| 128 width = container_width - padding_h | |
| 129 if target_size[0] < width: | |
| 130 self.size = target_size | |
| 131 else: | |
| 132 height = width / self.image_ratio | |
| 133 self.size = (width, height) | |
| 134 | |
| 135 def on_parent(self, instance, parent): | |
| 136 if parent is not None: | |
| 137 container = self._get_parent_container() | |
| 138 container.bind(width=self.on_container_width) | |
| 139 | |
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140 |
| 57 | 141 class SimpleXHTMLWidget(StackLayout): |
| 142 """widget handling simple XHTML parsing""" | |
| 143 xhtml = properties.StringProperty() | |
| 144 color = properties.ListProperty([1, 1, 1, 1]) | |
| 145 # XXX: bold is only used for escaped text | |
| 146 bold = properties.BooleanProperty(False) | |
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147 content_width = properties.NumericProperty(0) |
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148 font_size = properties.NumericProperty(sp(14)) |
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149 |
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150 # text/XHTML input |
| 57 | 151 |
| 152 def on_xhtml(self, instance, xhtml): | |
| 153 """parse xhtml and set content accordingly | |
| 154 | |
| 155 if xhtml is an instance of Escape, a Label with not markup | |
| 156 will be used | |
| 157 """ | |
| 158 self.clear_widgets() | |
| 159 if isinstance(xhtml, Escape): | |
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160 label = SimpleXHTMLWidgetEscapedText(text=xhtml, color=self.color) |
| 57 | 161 self.bind(color=label.setter('color')) |
| 162 self.bind(bold=label.setter('bold')) | |
| 163 self.add_widget(label) | |
| 164 else: | |
| 165 xhtml = ET.fromstring(xhtml.encode('utf-8')) | |
| 166 self.current_wid = None | |
| 167 self.styles = [] | |
| 168 self._callParseMethod(xhtml) | |
| 169 | |
| 170 def escape(self, text): | |
| 171 """mark that a text need to be escaped (i.e. no markup)""" | |
| 172 return Escape(text) | |
| 173 | |
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174 # sizing |
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175 |
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176 def on_width(self, instance, width): |
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177 if len(self.children) == 1: |
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178 wid = self.children[0] |
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179 if isinstance(wid, Label): |
| 68 | 180 # we have simple text |
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181 try: |
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182 full_width = wid._full_width |
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183 except AttributeError: |
| 68 | 184 # on first time, we need the required size |
| 185 # for the full text, without width limit | |
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186 wid.size_hint = (None, None) |
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187 wid.texture_update() |
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188 full_width = wid._full_width = wid.texture_size[0] |
| 68 | 189 |
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190 if full_width > width: |
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191 wid.text_size = width, None |
| 68 | 192 wid.width = width |
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193 else: |
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194 wid.text_size = None, None |
| 68 | 195 wid.texture_update() |
| 196 wid.width = wid.texture_size[0] | |
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197 self.content_width = wid.width + self.padding[0] + self.padding[2] |
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198 else: |
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199 wid.size_hint = (1, None) |
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200 wid.height = 100 |
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201 self.content_width = self.width |
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202 else: |
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203 self._do_complexe_sizing(width) |
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204 |
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205 def _do_complexe_sizing(self, width): |
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206 try: |
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207 self.splitted |
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208 except AttributeError: |
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209 # XXX: to make things easier, we split labels in words |
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210 log.debug(u"split start") |
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211 children = self.children[::-1] |
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212 self.clear_widgets() |
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213 for child in children: |
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214 if isinstance(child, Label): |
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215 log.debug(u"label before split: {}".format(child.text)) |
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216 styles = [] |
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217 tag = False |
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218 new_text = [] |
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219 current_tag = [] |
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220 current_value = [] |
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221 current_wid = self._createText() |
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222 value = False |
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223 close = False |
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224 # we will parse the text and create a new widget |
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225 # on each new word (actually each space) |
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226 # FIXME: handle '\n' and other white chars |
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227 for c in child.text: |
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228 if tag: |
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229 # we are parsing a markup tag |
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230 if c == u']': |
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231 current_tag_s = u''.join(current_tag) |
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232 current_style = (current_tag_s, u''.join(current_value)) |
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233 if close: |
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234 for idx, s in enumerate(reversed(styles)): |
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235 if s[0] == current_tag_s: |
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236 del styles[len(styles) - idx - 1] |
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237 break |
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238 else: |
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239 styles.append(current_style) |
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240 current_tag = [] |
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241 current_value = [] |
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242 tag = False |
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243 value = False |
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244 close = False |
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245 elif c == u'/': |
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246 close = True |
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247 elif c == u'=': |
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248 value = True |
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249 elif value: |
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250 current_value.append(c) |
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251 else: |
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252 current_tag.append(c) |
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253 new_text.append(c) |
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254 else: |
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255 # we are parsing regular text |
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256 if c == u'[': |
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257 new_text.append(c) |
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258 tag = True |
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259 elif c == u' ': |
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260 # new word, we do a new widget |
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261 new_text.append(u' ') |
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262 for t, v in reversed(styles): |
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263 new_text.append(u'[/{}]'.format(t)) |
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264 current_wid.text = u''.join(new_text) |
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265 new_text = [] |
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266 self.add_widget(current_wid) |
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267 log.debug(u"new widget: {}".format(current_wid.text)) |
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268 current_wid = self._createText() |
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269 for t, v in styles: |
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270 new_text.append(u'[{tag}{value}]'.format( |
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271 tag = t, |
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272 value = u'={}'.format(v) if v else u'')) |
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273 else: |
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274 new_text.append(c) |
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275 if current_wid.text: |
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276 # we may have a remaining widget after the parsing |
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277 close_styles = [] |
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278 for t, v in reversed(styles): |
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279 close_styles.append(u'[/{}]'.format(t)) |
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280 current_wid.text = u''.join(close_styles) |
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281 self.add_widget(current_wid) |
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282 log.debug(u"new widget: {}".format(current_wid.text)) |
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283 else: |
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284 # non Label widgets, we just add them |
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285 self.add_widget(child) |
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286 self.splitted = True |
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287 log.debug(u"split OK") |
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288 |
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289 # we now set the content width |
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290 # FIXME: for now we just use the full width |
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291 self.content_width = width |
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292 |
| 57 | 293 # XHTML parsing methods |
| 294 | |
| 295 def _callParseMethod(self, e): | |
| 296 """call the suitable method to parse the element | |
| 297 | |
| 298 self.xhtml_[tag] will be called if it exists, else | |
| 299 self.xhtml_generic will be used | |
| 300 @param e(ET.Element): element to parse | |
| 301 """ | |
| 302 try: | |
| 303 method = getattr(self, "xhtml_{}".format(e.tag)) | |
| 304 except AttributeError: | |
| 305 log.warning(u"Unhandled XHTML tag: {}".format(e.tag)) | |
| 306 method = self.xhtml_generic | |
| 307 method(e) | |
| 308 | |
| 309 def _addStyle(self, tag, value=None, append_to_list=True): | |
| 310 """add a markup style to label | |
| 311 | |
| 312 @param tag(unicode): markup tag | |
| 313 @param value(unicode): markup value if suitable | |
| 314 @param append_to_list(bool): if True style we be added to self.styles | |
| 315 self.styles is needed to keep track of styles to remove | |
| 316 should most probably be set to True | |
| 317 """ | |
| 318 label = self._getLabel() | |
| 319 label.text += u'[{tag}{value}]'.format( | |
| 320 tag = tag, | |
| 321 value = u'={}'.format(value) if value else '' | |
| 322 ) | |
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323 if append_to_list: |
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324 self.styles.append((tag, value)) |
| 57 | 325 |
| 326 def _removeStyle(self, tag, remove_from_list=True): | |
| 327 """remove a markup style from the label | |
| 328 | |
| 329 @param tag(unicode): markup tag to remove | |
| 330 @param remove_from_list(bool): if True, remove from self.styles too | |
| 331 should most probably be set to True | |
| 332 """ | |
| 333 label = self._getLabel() | |
| 334 label.text += u'[/{tag}]'.format( | |
| 335 tag = tag | |
| 336 ) | |
| 337 if remove_from_list: | |
| 338 for rev_idx, style in enumerate(reversed(self.styles)): | |
| 339 if style[0] == tag: | |
| 340 tag_idx = len(self.styles) - 1 - rev_idx | |
| 341 del self.styles[tag_idx] | |
| 342 break | |
| 343 | |
| 344 def _getLabel(self): | |
| 345 """get current Label if it exists, or create a new one""" | |
| 346 if not isinstance(self.current_wid, Label): | |
| 347 self._addLabel() | |
| 348 return self.current_wid | |
| 349 | |
| 350 def _addLabel(self): | |
| 351 """add a new Label | |
| 352 | |
| 353 current styles will be closed and reopened if needed | |
| 354 """ | |
| 355 self._closeLabel() | |
|
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356 self.current_wid = self._createText() |
| 57 | 357 for tag, value in self.styles: |
| 358 self._addStyle(tag, value, append_to_list=False) | |
| 359 self.add_widget(self.current_wid) | |
| 360 | |
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361 def _createText(self): |
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362 label = SimpleXHTMLWidgetText(color=self.color, markup=True) |
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363 self.bind(color=label.setter('color')) |
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364 label.bind(texture_size=label.setter('size')) |
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365 return label |
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366 |
| 57 | 367 def _closeLabel(self): |
| 368 """close current style tags in current label | |
| 369 | |
| 370 needed when you change label to keep style between | |
| 371 different widgets | |
| 372 """ | |
| 373 if isinstance(self.current_wid, Label): | |
| 374 for tag, value in reversed(self.styles): | |
| 375 self._removeStyle(tag, remove_from_list=False) | |
| 376 | |
| 377 def _parseCSS(self, e): | |
| 378 """parse CSS found in "style" attribute of element | |
| 379 | |
| 380 self._css_styles will be created and contained markup styles added by this method | |
| 381 @param e(ET.Element): element which may have a "style" attribute | |
| 382 """ | |
| 383 styles_limit = len(self.styles) | |
| 384 styles = e.attrib['style'].split(u';') | |
| 385 for style in styles: | |
| 386 try: | |
| 387 prop, value = style.split(u':') | |
| 388 except ValueError: | |
| 389 log.warning(u"can't parse style: {}".format(style)) | |
| 390 continue | |
| 391 prop = prop.strip().replace(u'-', '_') | |
| 392 value = value.strip() | |
| 393 try: | |
| 394 method = getattr(self, "css_{}".format(prop)) | |
| 395 except AttributeError: | |
| 396 log.warning(u"Unhandled CSS: {}".format(prop)) | |
| 397 else: | |
| 398 method(e, value) | |
| 399 self._css_styles = self.styles[styles_limit:] | |
| 400 | |
| 401 def _closeCSS(self): | |
| 402 """removed CSS styles | |
| 403 | |
| 404 styles in self._css_styles will be removed | |
| 405 and the attribute will be deleted | |
| 406 """ | |
| 407 for tag, dummy in reversed(self._css_styles): | |
| 408 self._removeStyle(tag) | |
| 409 del self._css_styles | |
| 410 | |
| 411 def xhtml_generic(self, elem, style=True, markup=None): | |
| 412 """generic method for adding HTML elements | |
| 413 | |
| 414 this method handle content, style and children parsing | |
| 415 @param elem(ET.Element): element to add | |
| 416 @param style(bool): if True handle style attribute (CSS) | |
| 417 @param markup(tuple[unicode, (unicode, None)], None): kivy markup to use | |
| 418 """ | |
| 419 # we first add markup and CSS style | |
| 420 if markup is not None: | |
| 421 if isinstance(markup, basestring): | |
| 422 tag, value = markup, None | |
| 423 else: | |
| 424 tag, value = markup | |
| 425 self._addStyle(tag, value) | |
| 426 style_ = 'style' in elem.attrib and style | |
| 427 if style_: | |
| 428 self._parseCSS(elem) | |
| 429 | |
| 430 # then content | |
| 431 if elem.text: | |
| 432 self._getLabel().text += escape_markup(elem.text) | |
| 433 | |
| 434 # we parse the children | |
| 435 for child in elem: | |
| 436 self._callParseMethod(child) | |
| 437 | |
| 438 # closing CSS style and markup | |
| 439 if style_: | |
| 440 self._closeCSS() | |
| 441 if markup is not None: | |
| 442 self._removeStyle(tag) | |
| 443 | |
| 444 # and the tail, which is regular text | |
| 445 if elem.tail: | |
| 446 self._getLabel().text += escape_markup(elem.tail) | |
| 447 | |
| 448 # method handling XHTML elements | |
| 449 | |
| 450 def xhtml_br(self, elem): | |
| 451 label = self._getLabel() | |
| 452 label.text+='\n' | |
| 453 self.xhtml_generic(style=False) | |
| 454 | |
| 455 def xhtml_em(self, elem): | |
| 456 self.xhtml_generic(elem, markup='i') | |
| 457 | |
|
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458 def xhtml_img(self, elem): |
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459 try: |
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460 src = elem.attrib['src'] |
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461 except KeyError: |
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462 log.warning(u"<img> element without src: {}".format(ET.tostring(elem))) |
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463 return |
| 59 | 464 try: |
| 465 target_height = int(elem.get(u'height', 0)) | |
| 466 except ValueError: | |
| 467 log.warning(u"Can't parse image height: {}".format(elem.get(u'height'))) | |
| 468 target_height = 0 | |
| 469 try: | |
| 470 target_width = int(elem.get(u'width', 0)) | |
| 471 except ValueError: | |
| 472 log.warning(u"Can't parse image width: {}".format(elem.get(u'width'))) | |
| 473 target_width = 0 | |
| 474 | |
| 475 img = SimpleXHTMLWidgetImage(source=src, target_height=target_height, target_width=target_width) | |
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476 self.current_wid = img |
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477 self.add_widget(img) |
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478 |
| 57 | 479 def xhtml_p(self, elem): |
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480 if isinstance(self.current_wid, Label): |
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481 self.current_wid.text+="\n\n" |
| 57 | 482 self.xhtml_generic(elem) |
| 483 | |
| 484 def xhtml_span(self, elem): | |
| 485 self.xhtml_generic(elem) | |
| 486 | |
| 487 def xhtml_strong(self, elem): | |
| 488 self.xhtml_generic(elem, markup='b') | |
| 489 | |
| 490 # methods handling CSS properties | |
| 491 | |
| 492 def css_color(self, elem, value): | |
| 493 self._addStyle(u"color", css_color.parse(value)) | |
| 494 | |
| 495 def css_text_decoration(self, elem, value): | |
| 496 if value == u'underline': | |
| 497 log.warning(u"{} not handled yet, it needs Kivy 1.9.2 to be released".format(value)) | |
| 498 # FIXME: activate when 1.9.2 is out | |
| 499 # self._addStyle('u') | |
| 500 elif value == u'line-through': | |
| 501 log.warning(u"{} not handled yet, it needs Kivy 1.9.2 to be released".format(value)) | |
| 502 # FIXME: activate when 1.9.2 is out | |
| 503 # self._addStyle('s') | |
| 504 else: | |
| 505 log.warning(u"unhandled text decoration: {}".format(value)) |