Mercurial > libervia-desktop-kivy
annotate libervia/desktop_kivy/core/simple_xhtml.py @ 508:d87b9a6b0b69
doc (calls): updated documentation to describe the new UI features:
fix 425
| author | Goffi <goffi@goffi.org> |
|---|---|
| date | Wed, 25 Oct 2023 15:29:33 +0200 |
| parents | b3cedbee561d |
| children |
| rev | line source |
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| 379 | 1 #!/usr/bin/env python3 |
| 2 | |
| 22 | 3 |
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4 #Libervia Desktop-Kivy |
| 461 | 5 # Copyright (C) 2016-2021 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 | |
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25 from kivy.metrics import sp |
| 22 | 26 from kivy import properties |
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27 from libervia.backend.core import log as logging |
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28 from libervia.frontends.tools import css_color, strings as sat_strings |
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29 from libervia.desktop_kivy import G |
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30 from libervia.desktop_kivy.core.common import SizedImage |
| 325 | 31 |
| 32 | |
| 33 log = logging.getLogger(__name__) | |
| 22 | 34 |
| 35 | |
| 312 | 36 class Escape(str): |
| 57 | 37 """Class used to mark that a message need to be escaped""" |
| 38 | |
| 39 | |
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40 class SimpleXHTMLWidgetEscapedText(Label): |
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41 |
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42 def on_parent(self, instance, parent): |
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43 if parent is not None: |
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44 self.font_size = parent.font_size |
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45 |
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46 def _add_url_markup(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()])) |
| 312 | 54 link_key = 'link_' + str(links) |
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55 url = m.group() |
| 325 | 56 escaped_url = escape_markup(url) |
| 57 text_elts.append( | |
| 58 f'[color=5500ff][ref={link_key}]{escaped_url}[/ref][/color]') | |
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59 if not links: |
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60 self.ref_urls = {link_key: url} |
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61 else: |
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62 self.ref_urls[link_key] = url |
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63 links += 1 |
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64 idx += m.end() |
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65 else: |
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66 if links: |
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67 text_elts.append(escape_markup(text[idx:])) |
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68 self.markup = True |
| 312 | 69 self.text = ''.join(text_elts) |
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70 break |
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71 |
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72 def on_text(self, instance, text): |
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73 # do NOT call the method if self.markup is set |
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74 # this would result in infinite loop (because self.text |
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75 # is changed if an URL is found, and in this case markup too) |
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76 if text and not self.markup: |
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77 self._add_url_markup(text) |
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78 |
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79 def on_ref_press(self, ref): |
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80 url = self.ref_urls[ref] |
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81 G.local_platform.open_url(url, self) |
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82 |
| 59 | 83 |
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84 class SimpleXHTMLWidgetText(Label): |
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85 |
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86 def on_parent(self, instance, parent): |
| 325 | 87 if parent is not None: |
| 88 self.font_size = parent.font_size | |
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89 |
| 59 | 90 |
| 57 | 91 class SimpleXHTMLWidget(StackLayout): |
| 92 """widget handling simple XHTML parsing""" | |
| 93 xhtml = properties.StringProperty() | |
| 94 color = properties.ListProperty([1, 1, 1, 1]) | |
| 95 # XXX: bold is only used for escaped text | |
| 96 bold = properties.BooleanProperty(False) | |
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97 font_size = properties.NumericProperty(sp(14)) |
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98 |
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99 # text/XHTML input |
| 57 | 100 |
| 101 def on_xhtml(self, instance, xhtml): | |
| 102 """parse xhtml and set content accordingly | |
| 103 | |
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104 if xhtml is an instance of Escape, a Label with no markup will be used |
| 57 | 105 """ |
| 106 self.clear_widgets() | |
| 107 if isinstance(xhtml, Escape): | |
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108 label = SimpleXHTMLWidgetEscapedText( |
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109 text=xhtml, color=self.color, bold=self.bold) |
| 325 | 110 self.bind(font_size=label.setter('font_size')) |
| 57 | 111 self.bind(color=label.setter('color')) |
| 112 self.bind(bold=label.setter('bold')) | |
| 113 self.add_widget(label) | |
| 114 else: | |
| 325 | 115 xhtml = ET.fromstring(xhtml.encode()) |
| 57 | 116 self.current_wid = None |
| 117 self.styles = [] | |
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118 self._call_parse_method(xhtml) |
| 325 | 119 if len(self.children) > 1: |
| 120 self._do_split_labels() | |
| 57 | 121 |
| 122 def escape(self, text): | |
| 123 """mark that a text need to be escaped (i.e. no markup)""" | |
| 124 return Escape(text) | |
| 125 | |
| 325 | 126 def _do_split_labels(self): |
| 127 """Split labels so their content can flow with images""" | |
| 128 # XXX: to make things easier, we split labels in words | |
| 129 log.debug("labels splitting start") | |
| 130 children = self.children[::-1] | |
| 131 self.clear_widgets() | |
| 132 for child in children: | |
| 133 if isinstance(child, Label): | |
| 134 log.debug("label before split: {}".format(child.text)) | |
| 135 styles = [] | |
| 136 tag = False | |
| 137 new_text = [] | |
| 138 current_tag = [] | |
| 139 current_value = [] | |
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140 current_wid = self._create_text() |
| 325 | 141 value = False |
| 142 close = False | |
| 143 # we will parse the text and create a new widget | |
| 144 # on each new word (actually each space) | |
| 145 # FIXME: handle '\n' and other white chars | |
| 146 for c in child.text: | |
| 147 if tag: | |
| 148 # we are parsing a markup tag | |
| 149 if c == ']': | |
| 150 current_tag_s = ''.join(current_tag) | |
| 151 current_style = (current_tag_s, ''.join(current_value)) | |
| 152 if close: | |
| 153 for idx, s in enumerate(reversed(styles)): | |
| 154 if s[0] == current_tag_s: | |
| 155 del styles[len(styles) - idx - 1] | |
| 156 break | |
| 157 else: | |
| 158 styles.append(current_style) | |
| 159 current_tag = [] | |
| 160 current_value = [] | |
| 161 tag = False | |
| 162 value = False | |
| 163 close = False | |
| 164 elif c == '/': | |
| 165 close = True | |
| 166 elif c == '=': | |
| 167 value = True | |
| 168 elif value: | |
| 169 current_value.append(c) | |
| 170 else: | |
| 171 current_tag.append(c) | |
| 172 new_text.append(c) | |
| 173 else: | |
| 174 # we are parsing regular text | |
| 175 if c == '[': | |
| 176 new_text.append(c) | |
| 177 tag = True | |
| 178 elif c == ' ': | |
| 179 # new word, we do a new widget | |
| 180 new_text.append(' ') | |
| 181 for t, v in reversed(styles): | |
| 182 new_text.append('[/{}]'.format(t)) | |
| 183 current_wid.text = ''.join(new_text) | |
| 184 new_text = [] | |
| 185 self.add_widget(current_wid) | |
| 186 log.debug("new widget: {}".format(current_wid.text)) | |
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187 current_wid = self._create_text() |
| 325 | 188 for t, v in styles: |
| 189 new_text.append('[{tag}{value}]'.format( | |
| 190 tag = t, | |
| 191 value = '={}'.format(v) if v else '')) | |
| 192 else: | |
| 193 new_text.append(c) | |
| 194 if current_wid.text: | |
| 195 # we may have a remaining widget after the parsing | |
| 196 close_styles = [] | |
| 197 for t, v in reversed(styles): | |
| 198 close_styles.append('[/{}]'.format(t)) | |
| 199 current_wid.text = ''.join(close_styles) | |
| 200 self.add_widget(current_wid) | |
| 201 log.debug("new widget: {}".format(current_wid.text)) | |
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202 else: |
| 325 | 203 # non Label widgets, we just add them |
| 204 self.add_widget(child) | |
| 205 self.splitted = True | |
| 206 log.debug("split OK") | |
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207 |
| 57 | 208 # XHTML parsing methods |
| 209 | |
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210 def _call_parse_method(self, e): |
| 325 | 211 """Call the suitable method to parse the element |
| 57 | 212 |
| 213 self.xhtml_[tag] will be called if it exists, else | |
| 214 self.xhtml_generic will be used | |
| 215 @param e(ET.Element): element to parse | |
| 216 """ | |
| 217 try: | |
| 325 | 218 method = getattr(self, f"xhtml_{e.tag}") |
| 57 | 219 except AttributeError: |
| 325 | 220 log.warning(f"Unhandled XHTML tag: {e.tag}") |
| 57 | 221 method = self.xhtml_generic |
| 222 method(e) | |
| 223 | |
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224 def _add_style(self, tag, value=None, append_to_list=True): |
| 57 | 225 """add a markup style to label |
| 226 | |
| 227 @param tag(unicode): markup tag | |
| 228 @param value(unicode): markup value if suitable | |
| 229 @param append_to_list(bool): if True style we be added to self.styles | |
| 230 self.styles is needed to keep track of styles to remove | |
| 231 should most probably be set to True | |
| 232 """ | |
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233 label = self._get_label() |
| 312 | 234 label.text += '[{tag}{value}]'.format( |
| 57 | 235 tag = tag, |
| 312 | 236 value = '={}'.format(value) if value else '' |
| 57 | 237 ) |
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238 if append_to_list: |
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239 self.styles.append((tag, value)) |
| 57 | 240 |
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241 def _remove_style(self, tag, remove_from_list=True): |
| 57 | 242 """remove a markup style from the label |
| 243 | |
| 244 @param tag(unicode): markup tag to remove | |
| 245 @param remove_from_list(bool): if True, remove from self.styles too | |
| 246 should most probably be set to True | |
| 247 """ | |
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248 label = self._get_label() |
| 312 | 249 label.text += '[/{tag}]'.format( |
| 57 | 250 tag = tag |
| 251 ) | |
| 252 if remove_from_list: | |
| 253 for rev_idx, style in enumerate(reversed(self.styles)): | |
| 254 if style[0] == tag: | |
| 255 tag_idx = len(self.styles) - 1 - rev_idx | |
| 256 del self.styles[tag_idx] | |
| 257 break | |
| 258 | |
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259 def _get_label(self): |
| 57 | 260 """get current Label if it exists, or create a new one""" |
| 261 if not isinstance(self.current_wid, Label): | |
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262 self._add_label() |
| 57 | 263 return self.current_wid |
| 264 | |
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265 def _add_label(self): |
| 57 | 266 """add a new Label |
| 267 | |
| 268 current styles will be closed and reopened if needed | |
| 269 """ | |
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270 self._close_label() |
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271 self.current_wid = self._create_text() |
| 57 | 272 for tag, value in self.styles: |
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273 self._add_style(tag, value, append_to_list=False) |
| 57 | 274 self.add_widget(self.current_wid) |
| 275 | |
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276 def _create_text(self): |
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277 label = SimpleXHTMLWidgetText(color=self.color, markup=True) |
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278 self.bind(color=label.setter('color')) |
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279 label.bind(texture_size=label.setter('size')) |
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280 return label |
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281 |
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282 def _close_label(self): |
| 57 | 283 """close current style tags in current label |
| 284 | |
| 285 needed when you change label to keep style between | |
| 286 different widgets | |
| 287 """ | |
| 288 if isinstance(self.current_wid, Label): | |
| 289 for tag, value in reversed(self.styles): | |
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290 self._remove_style(tag, remove_from_list=False) |
| 57 | 291 |
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292 def _parse_css(self, e): |
| 57 | 293 """parse CSS found in "style" attribute of element |
| 294 | |
| 295 self._css_styles will be created and contained markup styles added by this method | |
| 296 @param e(ET.Element): element which may have a "style" attribute | |
| 297 """ | |
| 298 styles_limit = len(self.styles) | |
| 312 | 299 styles = e.attrib['style'].split(';') |
| 57 | 300 for style in styles: |
| 301 try: | |
| 312 | 302 prop, value = style.split(':') |
| 57 | 303 except ValueError: |
| 325 | 304 log.warning(f"can't parse style: {style}") |
| 57 | 305 continue |
| 312 | 306 prop = prop.strip().replace('-', '_') |
| 57 | 307 value = value.strip() |
| 308 try: | |
| 325 | 309 method = getattr(self, f"css_{prop}") |
| 57 | 310 except AttributeError: |
| 325 | 311 log.warning(f"Unhandled CSS: {prop}") |
| 57 | 312 else: |
| 313 method(e, value) | |
| 314 self._css_styles = self.styles[styles_limit:] | |
| 315 | |
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316 def _close_css(self): |
| 57 | 317 """removed CSS styles |
| 318 | |
| 319 styles in self._css_styles will be removed | |
| 320 and the attribute will be deleted | |
| 321 """ | |
| 284 | 322 for tag, __ in reversed(self._css_styles): |
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323 self._remove_style(tag) |
| 57 | 324 del self._css_styles |
| 325 | |
| 326 def xhtml_generic(self, elem, style=True, markup=None): | |
| 325 | 327 """Generic method for adding HTML elements |
| 57 | 328 |
| 329 this method handle content, style and children parsing | |
| 330 @param elem(ET.Element): element to add | |
| 331 @param style(bool): if True handle style attribute (CSS) | |
| 332 @param markup(tuple[unicode, (unicode, None)], None): kivy markup to use | |
| 333 """ | |
| 334 # we first add markup and CSS style | |
| 335 if markup is not None: | |
| 312 | 336 if isinstance(markup, str): |
| 57 | 337 tag, value = markup, None |
| 338 else: | |
| 339 tag, value = markup | |
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340 self._add_style(tag, value) |
| 57 | 341 style_ = 'style' in elem.attrib and style |
| 342 if style_: | |
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343 self._parse_css(elem) |
| 57 | 344 |
| 345 # then content | |
| 346 if elem.text: | |
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347 self._get_label().text += escape_markup(elem.text) |
| 57 | 348 |
| 349 # we parse the children | |
| 350 for child in elem: | |
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351 self._call_parse_method(child) |
| 57 | 352 |
| 353 # closing CSS style and markup | |
| 354 if style_: | |
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355 self._close_css() |
| 57 | 356 if markup is not None: |
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357 self._remove_style(tag) |
| 57 | 358 |
| 359 # and the tail, which is regular text | |
| 360 if elem.tail: | |
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361 self._get_label().text += escape_markup(elem.tail) |
| 57 | 362 |
| 363 # method handling XHTML elements | |
| 364 | |
| 365 def xhtml_br(self, elem): | |
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366 label = self._get_label() |
| 57 | 367 label.text+='\n' |
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368 self.xhtml_generic(elem, style=False) |
| 57 | 369 |
| 370 def xhtml_em(self, elem): | |
| 371 self.xhtml_generic(elem, markup='i') | |
| 372 | |
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373 def xhtml_img(self, elem): |
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374 try: |
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375 src = elem.attrib['src'] |
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376 except KeyError: |
| 312 | 377 log.warning("<img> element without src: {}".format(ET.tostring(elem))) |
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378 return |
| 59 | 379 try: |
| 312 | 380 target_height = int(elem.get('height', 0)) |
| 59 | 381 except ValueError: |
| 325 | 382 log.warning(f"Can't parse image height: {elem.get('height')}") |
| 383 target_height = None | |
| 59 | 384 try: |
| 312 | 385 target_width = int(elem.get('width', 0)) |
| 59 | 386 except ValueError: |
| 325 | 387 log.warning(f"Can't parse image width: {elem.get('width')}") |
| 388 target_width = None | |
| 59 | 389 |
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390 img = SizedImage( |
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391 source=src, target_height=target_height, target_width=target_width) |
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392 self.current_wid = img |
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393 self.add_widget(img) |
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394 |
| 57 | 395 def xhtml_p(self, elem): |
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396 if isinstance(self.current_wid, Label): |
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397 self.current_wid.text+="\n\n" |
| 57 | 398 self.xhtml_generic(elem) |
| 399 | |
| 400 def xhtml_span(self, elem): | |
| 401 self.xhtml_generic(elem) | |
| 402 | |
| 403 def xhtml_strong(self, elem): | |
| 404 self.xhtml_generic(elem, markup='b') | |
| 405 | |
| 406 # methods handling CSS properties | |
| 407 | |
| 408 def css_color(self, elem, value): | |
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409 self._add_style("color", css_color.parse(value)) |
| 57 | 410 |
| 411 def css_text_decoration(self, elem, value): | |
| 312 | 412 if value == 'underline': |
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413 self._add_style('u') |
| 312 | 414 elif value == 'line-through': |
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415 self._add_style('s') |
| 57 | 416 else: |
| 312 | 417 log.warning("unhandled text decoration: {}".format(value)) |