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8d00847cfc
The new class allows applying visual filters to canvas drawing operations. It is conceptually similar to the LayerProcessor class, except that it applies directly to a canvas instead of a Picture. This functionality was extracted from PR #1755. NB: the guitar image was taken from here, which is a public domain image, i.e. licensed under CC0 1.0.
302 lines
11 KiB
Python
302 lines
11 KiB
Python
#!/usr/bin/env python
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import glob
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import os
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import re
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import shutil
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import subprocess
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from docutils import nodes
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from docutils.parsers.rst import directives
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from sphinx.util.docutils import SphinxDirective
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from sphinx.util.logging import getLogger
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# ------------------------------------------------------------------------------
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# `.. flutter-app::` directive
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# ------------------------------------------------------------------------------
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class FlutterAppDirective(SphinxDirective):
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"""
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Embed Flutter apps into documentation pages.
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This extension allows inserting precompiled Flutter apps into the
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generated documentation. The app to be inserted has to be configured for
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compiling in 'web' mode.
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Example of usage in Markdown:
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```{flutter-app}
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:sources: ../../tetris-tutorial
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:page: page3
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:show: popup
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```
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The following arguments are supported:
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:sources: - the directory where the app is located, i.e. the directory
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with the pubspec.yaml file of the app. The path should be relative to
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the `doc/_sphinx` folder.
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:page: - an additional parameter that will be appended to the URL of the
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app. The app can retrieve this parameter by checking the property
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`window.location.search` (where `window` is from `dart:html`), and then
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display the content based on that. Thus, this parameter allows bundling
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multiple separate Flutter widgets into one compiled app.
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In addition, the "code" run mode will try to locate a file or a folder
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with the matching name.
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:show: - a list of one or more run modes, which could include "widget",
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"popup", "code", and "infobox". Each of these modes produces a different
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output:
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"widget" - an iframe shown directly inside the docs page;
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"popup" - a [Run] button which opens the app to (almost) fullscreen;
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"code" - a [Code] button which opens a popup with the code that was
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compiled.
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"infobox" - the content will be displayed as an infobox floating on
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the right-hand side of the page.
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:width: - override the default width of an iframe in widget/infobox modes.
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:height: - override the default height of an iframe in widget/infobox
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modes.
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"""
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has_content = True
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required_arguments = 0
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optional_arguments = 0
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option_spec = {
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'sources': directives.unchanged,
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'page': directives.unchanged,
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'show': directives.unchanged,
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'width': directives.unchanged,
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'height': directives.unchanged,
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}
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# Static list of targets that were already compiled during the build
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COMPILED = []
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def __init__(self, *args, **kwds):
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super().__init__(*args, **kwds)
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self.modes = None
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self.logger = None
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self.app_name = None
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self.source_dir = None
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self.source_build_dir = None
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self.target_dir = None
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self.html_dir = None
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def run(self):
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self.logger = getLogger('flutter-app')
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self._process_show_option()
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self._process_sources_option()
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self.source_build_dir = os.path.join(self.source_dir, 'build', 'web')
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self.app_name = self._get_app_name()
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self.html_dir = '_static/apps/' + self.app_name
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self.target_dir = os.path.abspath(
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os.path.join('..', '_build', 'html', self.html_dir))
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self._ensure_compiled()
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page = self.options.get('page', '')
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iframe_url = _doc_root() + self.html_dir + '/index.html?' + page
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result = []
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if 'widget' in self.modes:
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iframe = IFrame(src=iframe_url, classes=['flutter-app-iframe'])
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result.append(iframe)
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styles = []
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if self.options.get('width'):
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width = self.options.get('width')
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if width.isdigit():
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width += 'px'
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styles.append("width: " + width)
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if self.options.get('height'):
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height = self.options.get('height')
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if height.isdigit():
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height += 'px'
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styles.append("height: " + height)
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if styles:
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iframe.attributes['style'] = '; '.join(styles)
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if 'popup' in self.modes:
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result.append(Button(
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'',
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nodes.Text('Run'),
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classes=['flutter-app-button', 'popup'],
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onclick=f'run_flutter_app("{iframe_url}")',
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))
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if 'code' in self.modes:
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code_id = self.app_name + "-source"
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result.append(self._generate_code_listings(code_id))
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result.append(Button(
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'',
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nodes.Text('Code'),
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classes=['flutter-app-button', 'code'],
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onclick=f'open_code_listings("{code_id}")',
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))
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if 'infobox' in self.modes:
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self.state.nested_parse(self.content, 0, result)
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result = [
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nodes.container('', *result, classes=['flutter-app-infobox'])
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]
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return result
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def _process_show_option(self):
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argument = self.options.get('show')
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if argument:
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values = argument.split()
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for value in values:
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if value not in ['widget', 'popup', 'code', 'infobox']:
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raise self.error('Invalid :show: value ' + value)
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self.modes = values
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else:
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self.modes = ['widget']
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def _process_sources_option(self):
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argument = self.options.get('sources', '')
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abspath = os.path.abspath(argument)
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if not argument:
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raise self.error('Missing required argument :sources:')
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if not os.path.isdir(abspath):
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raise self.error(
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f'sources=`{abspath}` does not exist or is not a directory')
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assert not abspath.endswith('/')
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self.source_dir = abspath
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def _get_app_name(self):
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src = os.path.relpath(self.source_dir)
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return '-'.join(word for word in re.split(r'\W', src) if word)
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def _ensure_compiled(self):
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need_compiling = (
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('popup' in self.modes or 'widget' in self.modes) and
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self.source_dir not in FlutterAppDirective.COMPILED
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)
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if not need_compiling:
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return
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self.logger.info('Compiling Flutter app [%s]' % self.app_name)
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self._compile_source()
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self._copy_compiled()
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self._create_index_html()
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self.logger.info(' + copied into ' + self.target_dir)
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assert os.path.isfile(self.target_dir + '/main.dart.js')
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assert os.path.isfile(self.target_dir + '/index.html')
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FlutterAppDirective.COMPILED.append(self.source_dir)
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def _compile_source(self):
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try:
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subprocess.run(
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['flutter', 'build', 'web'],
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stdout=subprocess.PIPE,
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stderr=subprocess.STDOUT,
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cwd=self.source_dir,
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check=True,
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)
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except subprocess.CalledProcessError as e:
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cmd = ' '.join(e.cmd)
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raise self.error(
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f'Command `{cmd}` returned with exit status {e.returncode}\n' +
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e.output.decode('utf-8'),
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)
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def _copy_compiled(self):
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assert os.path.isdir(self.source_build_dir)
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main_js = os.path.join(self.source_build_dir, 'main.dart.js')
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assets_dir = os.path.join(self.source_build_dir, 'assets')
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os.makedirs(self.target_dir, exist_ok=True)
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shutil.copy2(main_js, self.target_dir)
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if os.path.exists(assets_dir):
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shutil.copytree(
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src=assets_dir,
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dst=os.path.join(self.target_dir, 'assets'),
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dirs_exist_ok=True,
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)
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def _create_index_html(self):
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target_file = os.path.join(self.target_dir, 'index.html')
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with open(target_file, 'wt') as out:
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out.write('<!DOCTYPE html>\n')
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out.write('<html>\n<head>\n')
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out.write('<base href="%s%s/">\n' % (_doc_root(), self.html_dir))
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out.write('<title>%s</title>\n' % self.app_name)
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out.write('<style>body { background: black; }</style>\n')
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out.write('</head>\n<body>\n')
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out.write('<script src="main.dart.js"></script>\n')
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out.write('</body>\n</html>\n')
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def _generate_code_listings(self, code_id):
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code_dir = self.source_dir + '/lib/' + self.options.get('page', '')
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if os.path.isdir(code_dir):
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files = glob.glob(code_dir + '/**', recursive=True)
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elif os.path.isfile(code_dir + '.dart'):
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files = [code_dir + '.dart']
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code_dir += '/..'
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else:
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raise self.error(f'Cannot find source directory {code_dir} or '
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f'source file {code_dir}.dart')
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result = nodes.container(classes=['flutter-app-code'], ids=[code_id])
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for filename in sorted(files):
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if os.path.isfile(filename):
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simple_filename = os.path.relpath(filename, code_dir)
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result += nodes.container(
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'', nodes.Text(simple_filename), classes=['filename']
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)
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with open(filename, 'rt') as f:
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self.state.nested_parse(
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['``````{code-block} dart\n:lineno-start: 1\n'] +
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[line.rstrip() for line in f] +
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['``````\n'], 0, result)
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return result
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def _doc_root():
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root = os.environ.get('PUBLISH_PATH', '')
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if not root.startswith('/'):
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root = '/' + root
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if not root.endswith('/'):
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root = root + '/'
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return root
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# ------------------------------------------------------------------------------
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# Nodes
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# ------------------------------------------------------------------------------
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class IFrame(nodes.Element, nodes.General):
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def visit(self, node):
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attrs = {'src': node.attributes['src']}
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if 'style' in node.attributes:
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attrs['style'] = node.attributes['style']
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self.body.append(self.starttag(node, 'iframe', **attrs).strip())
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def depart(self, _):
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self.body.append('</iframe>')
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class Button(nodes.Element, nodes.General):
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def visit(self, node):
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attrs = {}
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if 'onclick' in node.attributes:
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attrs['onclick'] = node.attributes['onclick']
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self.body.append(self.starttag(node, 'button', **attrs).strip())
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def depart(self, _):
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self.body.append('</button>')
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# ------------------------------------------------------------------------------
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# Extension setup
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# ------------------------------------------------------------------------------
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def setup(app):
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base_dir = os.path.dirname(__file__)
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target_dir = os.path.abspath('../_build/html/_static/')
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os.makedirs(target_dir, exist_ok=True)
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shutil.copy(os.path.join(base_dir, 'flutter_app.js'), target_dir)
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shutil.copy(os.path.join(base_dir, 'flutter_app.css'), target_dir)
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app.add_node(IFrame, html=(IFrame.visit, IFrame.depart))
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app.add_node(Button, html=(Button.visit, Button.depart))
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app.add_directive('flutter-app', FlutterAppDirective)
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app.add_js_file('flutter_app.js')
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app.add_css_file('flutter_app.css')
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return {
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'parallel_read_safe': False,
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'parallel_write_safe': False,
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'env_version': 1,
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}
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