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https://github.com/RGBCube/serenity
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LibWeb: Parse multiple font-family values
Apart from now gathering comma-separated font-family names into a StyleValueList, this also corrects the logic for parsing a single font-family. Previously, we did not handle unquoted font names at all, and now they are handled including when they are several words separated by whitespace. Modified the logic for `font` to use `parse_font_family_value()`. `FontStyleValue.font_families()` is now a StyleValueList instead of a vector, so that it can be better handled in StyleResolver. We also finally remove the CSS::ParsingContext in set_property_expanding_shorthands(). :^)
This commit is contained in:
Sam Atkins
Andreas Kling
parent
75450d2250
commit
678760bd87
4 changed files with 120 additions and 93 deletions
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@ -2342,30 +2342,11 @@ RefPtr<StyleValue> Parser::parse_font_value(ParsingContext const& context, Vecto
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return false;
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};
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auto is_font_family = [](StyleValue const& value) -> bool {
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if (value.is_string())
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return true;
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switch (value.to_identifier()) {
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case ValueID::Cursive:
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case ValueID::Fantasy:
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case ValueID::Monospace:
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case ValueID::Serif:
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case ValueID::SansSerif:
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case ValueID::UiMonospace:
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case ValueID::UiRounded:
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case ValueID::UiSerif:
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case ValueID::UiSansSerif:
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return true;
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default:
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return false;
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}
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};
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RefPtr<StyleValue> font_style;
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RefPtr<StyleValue> font_weight;
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RefPtr<StyleValue> font_size;
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RefPtr<StyleValue> line_height;
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NonnullRefPtrVector<StyleValue> font_families;
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RefPtr<StyleValue> font_families;
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// FIXME: Implement font-stretch and font-variant.
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// FIXME: Handle system fonts. (caption, icon, menu, message-box, small-caption, status-bar)
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@ -2412,24 +2393,11 @@ RefPtr<StyleValue> Parser::parse_font_value(ParsingContext const& context, Vecto
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}
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}
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// Consume font-family
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// FIXME: Handle multiple font-families separated by commas, for fallback purposes.
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if (i + 1 < component_values.size()) {
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auto& font_family_part = component_values[i + 1];
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auto maybe_font_family = parse_css_value(context, PropertyID::Font, font_family_part);
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if (!maybe_font_family) {
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// Single-word font-families may not be quoted. We convert it to a String for convenience.
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if (font_family_part.is(Token::Type::Ident))
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maybe_font_family = StringStyleValue::create(font_family_part.token().ident());
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else
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return nullptr;
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} else if (!is_font_family(*maybe_font_family)) {
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dbgln("Unable to parse '{}' as a font-family.", font_family_part.to_debug_string());
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return nullptr;
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}
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font_families.append(maybe_font_family.release_nonnull());
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}
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// Consume font-families
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auto maybe_font_families = parse_font_family_value(context, component_values, i + 1);
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if (!maybe_font_families)
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return nullptr;
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font_families = maybe_font_families.release_nonnull();
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break;
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}
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@ -2443,7 +2411,7 @@ RefPtr<StyleValue> Parser::parse_font_value(ParsingContext const& context, Vecto
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if (unset_value_count < normal_count)
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return nullptr;
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if (!font_size || font_families.is_empty())
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if (!font_size || !font_families)
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return nullptr;
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if (!font_style)
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@ -2453,7 +2421,97 @@ RefPtr<StyleValue> Parser::parse_font_value(ParsingContext const& context, Vecto
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if (!line_height)
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line_height = IdentifierStyleValue::create(ValueID::Normal);
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return FontStyleValue::create(font_style.release_nonnull(), font_weight.release_nonnull(), font_size.release_nonnull(), line_height.release_nonnull(), move(font_families));
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return FontStyleValue::create(font_style.release_nonnull(), font_weight.release_nonnull(), font_size.release_nonnull(), line_height.release_nonnull(), font_families.release_nonnull());
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}
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RefPtr<StyleValue> Parser::parse_font_family_value(ParsingContext const& context, Vector<StyleComponentValueRule> const& component_values, size_t start_index)
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{
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auto is_generic_font_family = [](ValueID identifier) -> bool {
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switch (identifier) {
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case ValueID::Cursive:
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case ValueID::Fantasy:
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case ValueID::Monospace:
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case ValueID::Serif:
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case ValueID::SansSerif:
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case ValueID::UiMonospace:
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case ValueID::UiRounded:
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case ValueID::UiSerif:
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case ValueID::UiSansSerif:
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return true;
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default:
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return false;
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}
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};
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auto is_comma_or_eof = [&](size_t i) -> bool {
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if (i < component_values.size()) {
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auto& maybe_comma = component_values[i];
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if (!maybe_comma.is(Token::Type::Comma))
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return false;
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}
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return true;
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};
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// Note: Font-family names can either be a quoted string, or a keyword, or a series of custom-idents.
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// eg, these are equivalent:
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// font-family: my cool font\!, serif;
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// font-family: "my cool font!", serif;
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NonnullRefPtrVector<StyleValue> font_families;
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Vector<String> current_name_parts;
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for (size_t i = start_index; i < component_values.size(); ++i) {
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auto& part = component_values[i];
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if (part.is(Token::Type::String)) {
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// `font-family: my cool "font";` is invalid.
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if (!current_name_parts.is_empty())
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return nullptr;
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if (!is_comma_or_eof(i + 1))
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return nullptr;
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font_families.append(StringStyleValue::create(part.token().string()));
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i++;
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continue;
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}
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if (part.is(Token::Type::Ident)) {
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// If this is a valid identifier, it's NOT a custom-ident and can't be part of a larger name.
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auto maybe_ident = parse_css_value(context, PropertyID::FontFamily, part);
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if (maybe_ident) {
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// CSS-wide keywords are not allowed
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if (maybe_ident->is_builtin())
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return nullptr;
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if (is_generic_font_family(maybe_ident->to_identifier())) {
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// Can't have a generic-font-name as a token in an unquoted font name.
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if (!current_name_parts.is_empty())
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return nullptr;
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if (!is_comma_or_eof(i + 1))
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return nullptr;
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font_families.append(maybe_ident.release_nonnull());
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i++;
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continue;
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}
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}
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current_name_parts.append(part.token().ident());
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continue;
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}
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if (part.is(Token::Type::Comma)) {
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if (current_name_parts.is_empty())
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return nullptr;
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font_families.append(StringStyleValue::create(String::join(' ', current_name_parts)));
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current_name_parts.clear();
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// Can't have a trailing comma
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if (i + 1 == component_values.size())
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return nullptr;
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continue;
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}
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}
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if (!current_name_parts.is_empty()) {
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font_families.append(StringStyleValue::create(String::join(' ', current_name_parts)));
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current_name_parts.clear();
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}
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if (font_families.is_empty())
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return nullptr;
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return StyleValueList::create(move(font_families));
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}
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RefPtr<StyleValue> Parser::parse_list_style_value(ParsingContext const& context, Vector<StyleComponentValueRule> const& component_values)
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@ -2758,6 +2816,10 @@ RefPtr<StyleValue> Parser::parse_css_value(PropertyID property_id, TokenStream<S
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if (auto parsed_value = parse_font_value(m_context, component_values))
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return parsed_value;
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break;
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case PropertyID::FontFamily:
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if (auto parsed_value = parse_font_family_value(m_context, component_values))
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return parsed_value;
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break;
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case PropertyID::ListStyle:
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if (auto parsed_value = parse_list_style_value(m_context, component_values))
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return parsed_value;
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