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https://github.com/RGBCube/serenity
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LibWeb: Resolve CSS font property from value list
The font property now resolves into its various parts: - font-family - font-weight - font-size - font-style - line-height The font-variant and font-stretch parts are left unparsed since LibWeb doesn't know how to render those. Added `fonts.html` as a test for various forms of `font` declarations, based on the examples in the spec.
This commit is contained in:
Sam Atkins
Andreas Kling
parent
a44d7670ab
commit
82f3228dd2
4 changed files with 251 additions and 2 deletions
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@ -296,6 +296,98 @@ static inline bool is_flex_basis(StyleValue const& value)
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return false;
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}
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static inline bool is_font_family(StyleValue const& value)
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{
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if (value.is_builtin_or_dynamic())
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return true;
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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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static inline bool is_font_size(StyleValue const& value)
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{
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if (value.is_builtin_or_dynamic())
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return true;
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if (value.is_length())
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return true;
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switch (value.to_identifier()) {
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case ValueID::XxSmall:
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case ValueID::XSmall:
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case ValueID::Small:
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case ValueID::Medium:
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case ValueID::Large:
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case ValueID::XLarge:
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case ValueID::XxLarge:
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case ValueID::XxxLarge:
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case ValueID::Smaller:
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case ValueID::Larger:
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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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static inline bool is_font_style(StyleValue const& value)
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{
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// FIXME: Handle angle parameter to `oblique`: https://www.w3.org/TR/css-fonts-4/#font-style-prop
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if (value.is_builtin_or_dynamic())
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return true;
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switch (value.to_identifier()) {
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case ValueID::Normal:
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case ValueID::Italic:
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case ValueID::Oblique:
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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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static inline bool is_font_weight(StyleValue const& value)
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{
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if (value.is_builtin_or_dynamic())
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return true;
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if (value.is_numeric()) {
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auto weight = static_cast<NumericStyleValue const&>(value).value();
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return (weight >= 1 && weight <= 1000);
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}
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switch (value.to_identifier()) {
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case ValueID::Normal:
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case ValueID::Bold:
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case ValueID::Bolder:
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case ValueID::Lighter:
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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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static inline bool is_line_height(StyleValue const& value)
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{
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if (value.is_builtin_or_dynamic())
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return true;
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if (value.is_numeric())
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return true;
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if (value.is_length())
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return true;
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if (value.to_identifier() == ValueID::Normal)
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return true;
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return false;
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}
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static inline bool is_line_style(StyleValue const& value)
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{
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if (value.is_builtin_or_dynamic())
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@ -1308,7 +1400,6 @@ static void set_property_expanding_shorthands(StyleProperties& style, CSS::Prope
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return;
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}
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// FIXME: parse other values as well
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if (property_id == CSS::PropertyID::Font) {
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// FIXME: Remove string parsing once DeprecatedCSSParser is gone.
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if (value.is_string()) {
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@ -1334,7 +1425,125 @@ static void set_property_expanding_shorthands(StyleProperties& style, CSS::Prope
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return;
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}
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// FIXME: Handle this as a ValueListStyleValue.
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if (value.is_value_list()) {
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auto parts = static_cast<CSS::ValueListStyleValue const&>(value).values();
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RefPtr<StyleValue> font_style_value;
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RefPtr<StyleValue> font_weight_value;
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RefPtr<StyleValue> font_size_value;
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RefPtr<StyleValue> line_height_value;
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RefPtr<StyleValue> font_family_value;
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// FIXME: Implement font-stretch and font-variant.
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for (size_t i = 0; i < parts.size(); ++i) {
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auto value = Parser::parse_css_value(context, property_id, parts[i]);
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if (!value)
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return;
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if (is_font_style(*value)) {
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if (font_style_value)
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return;
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font_style_value = move(value);
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continue;
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}
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if (is_font_weight(*value)) {
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if (font_weight_value)
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return;
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font_weight_value = move(value);
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continue;
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}
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if (is_font_size(*value)) {
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if (font_size_value)
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return;
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font_size_value = move(value);
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// Consume `/ line-height` if present
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if (i + 2 < parts.size()) {
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auto solidus_part = parts[i + 1];
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if (!(solidus_part.is(Token::Type::Delim) && solidus_part.token().delim() == "/"sv))
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break;
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auto line_height = Parser::parse_css_value(context, property_id, parts[i + 2]);
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if (!(line_height && is_line_height(*line_height)))
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return;
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line_height_value = move(line_height);
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i += 2;
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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 < parts.size()) {
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auto& font_family_part = parts[i + 1];
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auto font_family = Parser::parse_css_value(context, property_id, font_family_part);
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if (!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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font_family = StringStyleValue::create(font_family_part.token().ident());
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else
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return;
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} else if (!is_font_family(*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;
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}
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font_family_value = move(font_family);
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}
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break;
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}
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return;
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}
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if (!font_size_value || !font_family_value)
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return;
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style.set_property(CSS::PropertyID::FontSize, *font_size_value);
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style.set_property(CSS::PropertyID::FontFamily, *font_family_value);
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if (font_style_value)
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style.set_property(CSS::PropertyID::FontStyle, *font_style_value);
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if (font_weight_value)
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style.set_property(CSS::PropertyID::FontWeight, *font_weight_value);
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if (line_height_value)
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style.set_property(CSS::PropertyID::LineHeight, *line_height_value);
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return;
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}
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if (value.is_inherit()) {
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style.set_property(CSS::PropertyID::FontSize, value);
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style.set_property(CSS::PropertyID::FontFamily, value);
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style.set_property(CSS::PropertyID::FontStyle, value);
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style.set_property(CSS::PropertyID::FontVariant, value);
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style.set_property(CSS::PropertyID::FontWeight, value);
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style.set_property(CSS::PropertyID::LineHeight, value);
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// FIXME: Implement font-stretch
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return;
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}
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// FIXME: Handle system fonts. (caption, icon, menu, message-box, small-caption, status-bar)
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return;
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}
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if (property_id == CSS::PropertyID::FontFamily) {
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if (value.is_value_list()) {
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auto parts = static_cast<CSS::ValueListStyleValue const&>(value).values();
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// FIXME: Handle multiple font-families separated by commas, for fallback purposes.
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for (auto& part : parts) {
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auto value = Parser::parse_css_value(context, property_id, part);
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if (!value)
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return;
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if (is_font_family(*value))
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style.set_property(CSS::PropertyID::FontFamily, *value);
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break;
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}
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return;
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}
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if (is_font_family(value)) {
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style.set_property(CSS::PropertyID::FontFamily, value);
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return;
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}
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return;
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}
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