feat: add comprehensive GitHub workflow and development tools

app/.venv/Lib/site-packages/weasyprint/svg/css.py

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+"""Apply CSS to SVG documents."""
+
+from urllib.parse import urljoin
+
+import cssselect2
+import tinycss2
+
+from ..logger import LOGGER
+from .utils import parse_url
+
+
+def find_stylesheets_rules(tree, stylesheet_rules, url):
+    """Find rules among stylesheet rules and imports."""
+    for rule in stylesheet_rules:
+        if rule.type == 'at-rule':
+            if rule.lower_at_keyword == 'import' and rule.content is None:
+                # TODO: support media types in @import
+                url_token = tinycss2.parse_one_component_value(rule.prelude)
+                if url_token.type not in ('string', 'url'):
+                    continue
+                css_url = parse_url(urljoin(url, url_token.value))
+                stylesheet = tinycss2.parse_stylesheet(
+                    tree.fetch_url(css_url, 'text/css').decode())
+                url = css_url.geturl()
+                yield from find_stylesheets_rules(tree, stylesheet, url)
+            # TODO: support media types
+            # if rule.lower_at_keyword == 'media':
+        elif rule.type == 'qualified-rule':
+            yield rule
+        # TODO: warn on error
+        # if rule.type == 'error':
+
+
+def parse_declarations(input):
+    """Parse declarations in a given rule content."""
+    normal_declarations = []
+    important_declarations = []
+    for declaration in tinycss2.parse_blocks_contents(input):
+        # TODO: warn on error
+        # if declaration.type == 'error':
+        if (declaration.type == 'declaration' and
+                not declaration.name.startswith('-')):
+            # Serializing perfectly good tokens just to re-parse them later :(
+            value = tinycss2.serialize(declaration.value).strip()
+            declarations = (
+                important_declarations if declaration.important
+                else normal_declarations)
+            declarations.append((declaration.lower_name, value))
+    return normal_declarations, important_declarations
+
+
+def parse_stylesheets(tree, url):
+    """Find stylesheets and return rule matchers in given tree."""
+    normal_matcher = cssselect2.Matcher()
+    important_matcher = cssselect2.Matcher()
+
+    # Find stylesheets
+    # TODO: support contentStyleType on <svg>
+    stylesheets = []
+    for element in tree.etree_element.iter():
+        # https://www.w3.org/TR/SVG/styling.html#StyleElement
+        if (element.tag == '{http://www.w3.org/2000/svg}style' and
+                element.get('type', 'text/css') == 'text/css' and
+                element.text):
+            # TODO: pass href for relative URLs
+            # TODO: support media types
+            # TODO: what if <style> has children elements?
+            stylesheets.append(tinycss2.parse_stylesheet(
+                element.text, skip_comments=True, skip_whitespace=True))
+
+    # Parse rules and fill matchers
+    for stylesheet in stylesheets:
+        for rule in find_stylesheets_rules(tree, stylesheet, url):
+            normal_declarations, important_declarations = parse_declarations(
+                rule.content)
+            try:
+                selectors = cssselect2.compile_selector_list(rule.prelude)
+            except cssselect2.parser.SelectorError as exception:
+                LOGGER.warning(
+                    'Failed to apply CSS rule in SVG rule: %s', exception)
+                break
+            for selector in selectors:
+                if (selector.pseudo_element is None and
+                        not selector.never_matches):
+                    if normal_declarations:
+                        normal_matcher.add_selector(
+                            selector, normal_declarations)
+                    if important_declarations:
+                        important_matcher.add_selector(
+                            selector, important_declarations)
+
+    return normal_matcher, important_matcher