Mercurial > libervia-desktop-kivy
annotate cagou/core/simple_xhtml.py @ 379:1da3c379205b
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| author | Goffi <goffi@goffi.org> |
|---|---|
| date | Wed, 29 Jan 2020 10:04:35 +0100 |
| parents | 4d660b252487 |
| children | efee0e0afb78 |
| rev | line source |
|---|---|
| 379 | 1 #!/usr/bin/env python3 |
| 2 | |
| 22 | 3 |
| 4 # Cagou: desktop/mobile frontend for Salut à Toi XMPP client | |
| 378 | 5 # Copyright (C) 2016-2020 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 | |
| 325 | 21 from xml.etree import ElementTree as ET |
| 57 | 22 from kivy.uix.stacklayout import StackLayout |
| 23 from kivy.uix.label import Label | |
| 24 from kivy.utils import escape_markup | |
| 325 | 25 from kivy.metrics import sp, dp |
| 22 | 26 from kivy import properties |
| 325 | 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 |
| 325 | 31 from cagou.core.constants import Const as C |
| 32 | |
| 33 | |
| 34 log = logging.getLogger(__name__) | |
| 22 | 35 |
| 36 | |
| 312 | 37 class Escape(str): |
| 57 | 38 """Class used to mark that a message need to be escaped""" |
| 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 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()])) |
| 312 | 55 link_key = 'link_' + str(links) |
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56 url = m.group() |
| 325 | 57 escaped_url = escape_markup(url) |
| 58 text_elts.append( | |
| 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 |
| 312 | 70 self.text = ''.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 G.local_platform.open_url(url, self) |
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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): |
| 325 | 88 if parent is not None: |
| 89 self.font_size = parent.font_size | |
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90 |
| 59 | 91 |
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92 class SimpleXHTMLWidgetImage(AsyncImage): |
| 59 | 93 # following properties are desired height/width |
| 94 # i.e. the ones specified in height/width attributes of <img> | |
| 95 # (or wanted for whatever reason) | |
| 325 | 96 # set to None to ignore them |
| 97 target_height = properties.NumericProperty(allownone=True) | |
| 98 target_width = properties.NumericProperty(allownone=True) | |
| 59 | 99 |
| 325 | 100 def __init__(self, **kwargs): |
| 101 # best calculated size | |
| 102 self._best_width = self._best_height = 100 | |
| 103 super().__init__(**kwargs) | |
| 59 | 104 |
| 325 | 105 def on_texture(self, instance, texture): |
| 106 """Adapt the size according to max size and target_*""" | |
| 107 if texture is None: | |
| 108 return | |
| 109 max_width, max_height = dp(C.IMG_MAX_WIDTH), dp(C.IMG_MAX_HEIGHT) | |
| 110 width, height = texture.size | |
| 111 if self.target_width: | |
| 112 width = min(width, self.target_width) | |
| 113 if width > max_width: | |
| 114 width = C.IMG_MAX_WIDTH | |
| 59 | 115 |
| 325 | 116 height = width / self.image_ratio |
| 117 | |
| 118 if self.target_height: | |
| 119 height = min(height, self.target_height) | |
| 120 | |
| 121 if height > max_height: | |
| 122 height = max_height | |
| 123 width = height * self.image_ratio | |
| 124 | |
| 125 self.width, self.height = self._best_width, self._best_height = width, height | |
| 59 | 126 |
| 127 def on_parent(self, instance, parent): | |
| 128 if parent is not None: | |
| 325 | 129 parent.bind(width=self.on_parent_width) |
| 130 | |
| 131 def on_parent_width(self, instance, width): | |
| 132 if self._best_width > width: | |
| 133 self.width = width | |
| 134 self.height = width / self.image_ratio | |
| 135 else: | |
| 136 self.width, self.height = self._best_width, self._best_height | |
| 59 | 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 font_size = properties.NumericProperty(sp(14)) |
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146 |
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147 # text/XHTML input |
| 57 | 148 |
| 149 def on_xhtml(self, instance, xhtml): | |
| 150 """parse xhtml and set content accordingly | |
| 151 | |
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152 if xhtml is an instance of Escape, a Label with no markup will be used |
| 57 | 153 """ |
| 154 self.clear_widgets() | |
| 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) |
| 325 | 158 self.bind(font_size=label.setter('font_size')) |
| 57 | 159 self.bind(color=label.setter('color')) |
| 160 self.bind(bold=label.setter('bold')) | |
| 161 self.add_widget(label) | |
| 162 else: | |
| 325 | 163 xhtml = ET.fromstring(xhtml.encode()) |
| 57 | 164 self.current_wid = None |
| 165 self.styles = [] | |
| 166 self._callParseMethod(xhtml) | |
| 325 | 167 if len(self.children) > 1: |
| 168 self._do_split_labels() | |
| 57 | 169 |
| 170 def escape(self, text): | |
| 171 """mark that a text need to be escaped (i.e. no markup)""" | |
| 172 return Escape(text) | |
| 173 | |
| 325 | 174 def _do_split_labels(self): |
| 175 """Split labels so their content can flow with images""" | |
| 176 # XXX: to make things easier, we split labels in words | |
| 177 log.debug("labels splitting start") | |
| 178 children = self.children[::-1] | |
| 179 self.clear_widgets() | |
| 180 for child in children: | |
| 181 if isinstance(child, Label): | |
| 182 log.debug("label before split: {}".format(child.text)) | |
| 183 styles = [] | |
| 184 tag = False | |
| 185 new_text = [] | |
| 186 current_tag = [] | |
| 187 current_value = [] | |
| 188 current_wid = self._createText() | |
| 189 value = False | |
| 190 close = False | |
| 191 # we will parse the text and create a new widget | |
| 192 # on each new word (actually each space) | |
| 193 # FIXME: handle '\n' and other white chars | |
| 194 for c in child.text: | |
| 195 if tag: | |
| 196 # we are parsing a markup tag | |
| 197 if c == ']': | |
| 198 current_tag_s = ''.join(current_tag) | |
| 199 current_style = (current_tag_s, ''.join(current_value)) | |
| 200 if close: | |
| 201 for idx, s in enumerate(reversed(styles)): | |
| 202 if s[0] == current_tag_s: | |
| 203 del styles[len(styles) - idx - 1] | |
| 204 break | |
| 205 else: | |
| 206 styles.append(current_style) | |
| 207 current_tag = [] | |
| 208 current_value = [] | |
| 209 tag = False | |
| 210 value = False | |
| 211 close = False | |
| 212 elif c == '/': | |
| 213 close = True | |
| 214 elif c == '=': | |
| 215 value = True | |
| 216 elif value: | |
| 217 current_value.append(c) | |
| 218 else: | |
| 219 current_tag.append(c) | |
| 220 new_text.append(c) | |
| 221 else: | |
| 222 # we are parsing regular text | |
| 223 if c == '[': | |
| 224 new_text.append(c) | |
| 225 tag = True | |
| 226 elif c == ' ': | |
| 227 # new word, we do a new widget | |
| 228 new_text.append(' ') | |
| 229 for t, v in reversed(styles): | |
| 230 new_text.append('[/{}]'.format(t)) | |
| 231 current_wid.text = ''.join(new_text) | |
| 232 new_text = [] | |
| 233 self.add_widget(current_wid) | |
| 234 log.debug("new widget: {}".format(current_wid.text)) | |
| 235 current_wid = self._createText() | |
| 236 for t, v in styles: | |
| 237 new_text.append('[{tag}{value}]'.format( | |
| 238 tag = t, | |
| 239 value = '={}'.format(v) if v else '')) | |
| 240 else: | |
| 241 new_text.append(c) | |
| 242 if current_wid.text: | |
| 243 # we may have a remaining widget after the parsing | |
| 244 close_styles = [] | |
| 245 for t, v in reversed(styles): | |
| 246 close_styles.append('[/{}]'.format(t)) | |
| 247 current_wid.text = ''.join(close_styles) | |
| 248 self.add_widget(current_wid) | |
| 249 log.debug("new widget: {}".format(current_wid.text)) | |
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250 else: |
| 325 | 251 # non Label widgets, we just add them |
| 252 self.add_widget(child) | |
| 253 self.splitted = True | |
| 254 log.debug("split OK") | |
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255 |
| 57 | 256 # XHTML parsing methods |
| 257 | |
| 258 def _callParseMethod(self, e): | |
| 325 | 259 """Call the suitable method to parse the element |
| 57 | 260 |
| 261 self.xhtml_[tag] will be called if it exists, else | |
| 262 self.xhtml_generic will be used | |
| 263 @param e(ET.Element): element to parse | |
| 264 """ | |
| 265 try: | |
| 325 | 266 method = getattr(self, f"xhtml_{e.tag}") |
| 57 | 267 except AttributeError: |
| 325 | 268 log.warning(f"Unhandled XHTML tag: {e.tag}") |
| 57 | 269 method = self.xhtml_generic |
| 270 method(e) | |
| 271 | |
| 272 def _addStyle(self, tag, value=None, append_to_list=True): | |
| 273 """add a markup style to label | |
| 274 | |
| 275 @param tag(unicode): markup tag | |
| 276 @param value(unicode): markup value if suitable | |
| 277 @param append_to_list(bool): if True style we be added to self.styles | |
| 278 self.styles is needed to keep track of styles to remove | |
| 279 should most probably be set to True | |
| 280 """ | |
| 281 label = self._getLabel() | |
| 312 | 282 label.text += '[{tag}{value}]'.format( |
| 57 | 283 tag = tag, |
| 312 | 284 value = '={}'.format(value) if value else '' |
| 57 | 285 ) |
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286 if append_to_list: |
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287 self.styles.append((tag, value)) |
| 57 | 288 |
| 289 def _removeStyle(self, tag, remove_from_list=True): | |
| 290 """remove a markup style from the label | |
| 291 | |
| 292 @param tag(unicode): markup tag to remove | |
| 293 @param remove_from_list(bool): if True, remove from self.styles too | |
| 294 should most probably be set to True | |
| 295 """ | |
| 296 label = self._getLabel() | |
| 312 | 297 label.text += '[/{tag}]'.format( |
| 57 | 298 tag = tag |
| 299 ) | |
| 300 if remove_from_list: | |
| 301 for rev_idx, style in enumerate(reversed(self.styles)): | |
| 302 if style[0] == tag: | |
| 303 tag_idx = len(self.styles) - 1 - rev_idx | |
| 304 del self.styles[tag_idx] | |
| 305 break | |
| 306 | |
| 307 def _getLabel(self): | |
| 308 """get current Label if it exists, or create a new one""" | |
| 309 if not isinstance(self.current_wid, Label): | |
| 310 self._addLabel() | |
| 311 return self.current_wid | |
| 312 | |
| 313 def _addLabel(self): | |
| 314 """add a new Label | |
| 315 | |
| 316 current styles will be closed and reopened if needed | |
| 317 """ | |
| 318 self._closeLabel() | |
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319 self.current_wid = self._createText() |
| 57 | 320 for tag, value in self.styles: |
| 321 self._addStyle(tag, value, append_to_list=False) | |
| 322 self.add_widget(self.current_wid) | |
| 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 | 330 def _closeLabel(self): |
| 331 """close current style tags in current label | |
| 332 | |
| 333 needed when you change label to keep style between | |
| 334 different widgets | |
| 335 """ | |
| 336 if isinstance(self.current_wid, Label): | |
| 337 for tag, value in reversed(self.styles): | |
| 338 self._removeStyle(tag, remove_from_list=False) | |
| 339 | |
| 340 def _parseCSS(self, e): | |
| 341 """parse CSS found in "style" attribute of element | |
| 342 | |
| 343 self._css_styles will be created and contained markup styles added by this method | |
| 344 @param e(ET.Element): element which may have a "style" attribute | |
| 345 """ | |
| 346 styles_limit = len(self.styles) | |
| 312 | 347 styles = e.attrib['style'].split(';') |
| 57 | 348 for style in styles: |
| 349 try: | |
| 312 | 350 prop, value = style.split(':') |
| 57 | 351 except ValueError: |
| 325 | 352 log.warning(f"can't parse style: {style}") |
| 57 | 353 continue |
| 312 | 354 prop = prop.strip().replace('-', '_') |
| 57 | 355 value = value.strip() |
| 356 try: | |
| 325 | 357 method = getattr(self, f"css_{prop}") |
| 57 | 358 except AttributeError: |
| 325 | 359 log.warning(f"Unhandled CSS: {prop}") |
| 57 | 360 else: |
| 361 method(e, value) | |
| 362 self._css_styles = self.styles[styles_limit:] | |
| 363 | |
| 364 def _closeCSS(self): | |
| 365 """removed CSS styles | |
| 366 | |
| 367 styles in self._css_styles will be removed | |
| 368 and the attribute will be deleted | |
| 369 """ | |
| 284 | 370 for tag, __ in reversed(self._css_styles): |
| 57 | 371 self._removeStyle(tag) |
| 372 del self._css_styles | |
| 373 | |
| 374 def xhtml_generic(self, elem, style=True, markup=None): | |
| 325 | 375 """Generic method for adding HTML elements |
| 57 | 376 |
| 377 this method handle content, style and children parsing | |
| 378 @param elem(ET.Element): element to add | |
| 379 @param style(bool): if True handle style attribute (CSS) | |
| 380 @param markup(tuple[unicode, (unicode, None)], None): kivy markup to use | |
| 381 """ | |
| 382 # we first add markup and CSS style | |
| 383 if markup is not None: | |
| 312 | 384 if isinstance(markup, str): |
| 57 | 385 tag, value = markup, None |
| 386 else: | |
| 387 tag, value = markup | |
| 388 self._addStyle(tag, value) | |
| 389 style_ = 'style' in elem.attrib and style | |
| 390 if style_: | |
| 391 self._parseCSS(elem) | |
| 392 | |
| 393 # then content | |
| 394 if elem.text: | |
| 395 self._getLabel().text += escape_markup(elem.text) | |
| 396 | |
| 397 # we parse the children | |
| 398 for child in elem: | |
| 399 self._callParseMethod(child) | |
| 400 | |
| 401 # closing CSS style and markup | |
| 402 if style_: | |
| 403 self._closeCSS() | |
| 404 if markup is not None: | |
| 405 self._removeStyle(tag) | |
| 406 | |
| 407 # and the tail, which is regular text | |
| 408 if elem.tail: | |
| 409 self._getLabel().text += escape_markup(elem.tail) | |
| 410 | |
| 411 # method handling XHTML elements | |
| 412 | |
| 413 def xhtml_br(self, elem): | |
| 414 label = self._getLabel() | |
| 415 label.text+='\n' | |
| 416 self.xhtml_generic(style=False) | |
| 417 | |
| 418 def xhtml_em(self, elem): | |
| 419 self.xhtml_generic(elem, markup='i') | |
| 420 | |
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421 def xhtml_img(self, elem): |
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422 try: |
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423 src = elem.attrib['src'] |
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424 except KeyError: |
| 312 | 425 log.warning("<img> element without src: {}".format(ET.tostring(elem))) |
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426 return |
| 59 | 427 try: |
| 312 | 428 target_height = int(elem.get('height', 0)) |
| 59 | 429 except ValueError: |
| 325 | 430 log.warning(f"Can't parse image height: {elem.get('height')}") |
| 431 target_height = None | |
| 59 | 432 try: |
| 312 | 433 target_width = int(elem.get('width', 0)) |
| 59 | 434 except ValueError: |
| 325 | 435 log.warning(f"Can't parse image width: {elem.get('width')}") |
| 436 target_width = None | |
| 59 | 437 |
| 438 img = SimpleXHTMLWidgetImage(source=src, target_height=target_height, target_width=target_width) | |
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439 self.current_wid = img |
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440 self.add_widget(img) |
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441 |
| 57 | 442 def xhtml_p(self, elem): |
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443 if isinstance(self.current_wid, Label): |
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444 self.current_wid.text+="\n\n" |
| 57 | 445 self.xhtml_generic(elem) |
| 446 | |
| 447 def xhtml_span(self, elem): | |
| 448 self.xhtml_generic(elem) | |
| 449 | |
| 450 def xhtml_strong(self, elem): | |
| 451 self.xhtml_generic(elem, markup='b') | |
| 452 | |
| 453 # methods handling CSS properties | |
| 454 | |
| 455 def css_color(self, elem, value): | |
| 312 | 456 self._addStyle("color", css_color.parse(value)) |
| 57 | 457 |
| 458 def css_text_decoration(self, elem, value): | |
| 312 | 459 if value == 'underline': |
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460 self._addStyle('u') |
| 312 | 461 elif value == 'line-through': |
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462 self._addStyle('s') |
| 57 | 463 else: |
| 312 | 464 log.warning("unhandled text decoration: {}".format(value)) |