diff options
Diffstat (limited to 'servo/components/style/properties/shorthands/font.mako.rs')
| -rw-r--r-- | servo/components/style/properties/shorthands/font.mako.rs | 542 |
1 files changed, 542 insertions, 0 deletions
diff --git a/servo/components/style/properties/shorthands/font.mako.rs b/servo/components/style/properties/shorthands/font.mako.rs new file mode 100644 index 0000000000..c8046c644a --- /dev/null +++ b/servo/components/style/properties/shorthands/font.mako.rs @@ -0,0 +1,542 @@ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at https://mozilla.org/MPL/2.0/. */ + +<%namespace name="helpers" file="/helpers.mako.rs" /> +<% from data import SYSTEM_FONT_LONGHANDS %> + +<%helpers:shorthand + name="font" + engines="gecko servo-2013 servo-2020" + sub_properties=" + font-style + font-variant-caps + font-weight + font-stretch + font-size + line-height + font-family + ${'font-size-adjust' if engine == 'gecko' else ''} + ${'font-kerning' if engine == 'gecko' else ''} + ${'font-optical-sizing' if engine == 'gecko' else ''} + ${'font-variant-alternates' if engine == 'gecko' else ''} + ${'font-variant-east-asian' if engine == 'gecko' else ''} + ${'font-variant-emoji' if engine == 'gecko' else ''} + ${'font-variant-ligatures' if engine == 'gecko' else ''} + ${'font-variant-numeric' if engine == 'gecko' else ''} + ${'font-variant-position' if engine == 'gecko' else ''} + ${'font-language-override' if engine == 'gecko' else ''} + ${'font-feature-settings' if engine == 'gecko' else ''} + ${'font-variation-settings' if engine == 'gecko' else ''} + " + derive_value_info="False" + spec="https://drafts.csswg.org/css-fonts-3/#propdef-font" +> + use crate::computed_values::font_variant_caps::T::SmallCaps; + use crate::parser::Parse; + use crate::properties::longhands::{font_family, font_style, font_size, font_weight, font_stretch}; + use crate::properties::longhands::font_variant_caps; + use crate::values::specified::text::LineHeight; + use crate::values::specified::{FontSize, FontWeight}; + use crate::values::specified::font::{FontStretch, FontStretchKeyword}; + #[cfg(feature = "gecko")] + use crate::values::specified::font::SystemFont; + + <% + gecko_sub_properties = "kerning language_override size_adjust \ + variant_alternates variant_east_asian \ + variant_emoji variant_ligatures \ + variant_numeric variant_position \ + feature_settings variation_settings \ + optical_sizing".split() + %> + % if engine == "gecko": + % for prop in gecko_sub_properties: + use crate::properties::longhands::font_${prop}; + % endfor + % endif + use self::font_family::SpecifiedValue as FontFamily; + + pub fn parse_value<'i, 't>( + context: &ParserContext, + input: &mut Parser<'i, 't>, + ) -> Result<Longhands, ParseError<'i>> { + let mut nb_normals = 0; + let mut style = None; + let mut variant_caps = None; + let mut weight = None; + let mut stretch = None; + let size; + % if engine == "gecko": + if let Ok(sys) = input.try_parse(|i| SystemFont::parse(context, i)) { + return Ok(expanded! { + % for name in SYSTEM_FONT_LONGHANDS: + ${name}: ${name}::SpecifiedValue::system_font(sys), + % endfor + line_height: LineHeight::normal(), + % for name in gecko_sub_properties + ["variant_caps"]: + font_${name}: font_${name}::get_initial_specified_value(), + % endfor + }) + } + % endif + loop { + // Special-case 'normal' because it is valid in each of + // font-style, font-weight, font-variant and font-stretch. + // Leaves the values to None, 'normal' is the initial value for each of them. + if input.try_parse(|input| input.expect_ident_matching("normal")).is_ok() { + nb_normals += 1; + continue; + } + if style.is_none() { + if let Ok(value) = input.try_parse(|input| font_style::parse(context, input)) { + style = Some(value); + continue + } + } + if weight.is_none() { + if let Ok(value) = input.try_parse(|input| font_weight::parse(context, input)) { + weight = Some(value); + continue + } + } + if variant_caps.is_none() { + // The only variant-caps value allowed is small-caps (from CSS2); the added values + // defined by CSS Fonts 3 and later are not accepted. + // https://www.w3.org/TR/css-fonts-4/#font-prop + if input.try_parse(|input| input.expect_ident_matching("small-caps")).is_ok() { + variant_caps = Some(SmallCaps); + continue + } + } + if stretch.is_none() { + if let Ok(value) = input.try_parse(FontStretchKeyword::parse) { + stretch = Some(FontStretch::Keyword(value)); + continue + } + } + size = Some(FontSize::parse(context, input)?); + break + } + + let size = match size { + Some(s) => s, + None => { + return Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError)) + } + }; + + let line_height = if input.try_parse(|input| input.expect_delim('/')).is_ok() { + Some(LineHeight::parse(context, input)?) + } else { + None + }; + + #[inline] + fn count<T>(opt: &Option<T>) -> u8 { + if opt.is_some() { 1 } else { 0 } + } + + if (count(&style) + count(&weight) + count(&variant_caps) + count(&stretch) + nb_normals) > 4 { + return Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError)) + } + + let family = FontFamily::parse(context, input)?; + Ok(expanded! { + % for name in "style weight stretch variant_caps".split(): + font_${name}: unwrap_or_initial!(font_${name}, ${name}), + % endfor + font_size: size, + line_height: line_height.unwrap_or(LineHeight::normal()), + font_family: family, + % if engine == "gecko": + % for name in gecko_sub_properties: + font_${name}: font_${name}::get_initial_specified_value(), + % endfor + % endif + }) + } + + % if engine == "gecko": + enum CheckSystemResult { + AllSystem(SystemFont), + SomeSystem, + None + } + % endif + + impl<'a> ToCss for LonghandsToSerialize<'a> { + fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result where W: fmt::Write { + % if engine == "gecko": + match self.check_system() { + CheckSystemResult::AllSystem(sys) => return sys.to_css(dest), + CheckSystemResult::SomeSystem => return Ok(()), + CheckSystemResult::None => {} + } + % endif + + % if engine == "gecko": + if let Some(v) = self.font_optical_sizing { + if v != &font_optical_sizing::get_initial_specified_value() { + return Ok(()); + } + } + if let Some(v) = self.font_variation_settings { + if v != &font_variation_settings::get_initial_specified_value() { + return Ok(()); + } + } + if let Some(v) = self.font_variant_emoji { + if v != &font_variant_emoji::get_initial_specified_value() { + return Ok(()); + } + } + + % for name in gecko_sub_properties: + % if name != "optical_sizing" and name != "variation_settings" and name != "variant_emoji": + if self.font_${name} != &font_${name}::get_initial_specified_value() { + return Ok(()); + } + % endif + % endfor + % endif + + // Only font-stretch keywords are allowed as part as the font + // shorthand. + let font_stretch = match *self.font_stretch { + FontStretch::Keyword(kw) => kw, + FontStretch::Stretch(percentage) => { + match FontStretchKeyword::from_percentage(percentage.0.get()) { + Some(kw) => kw, + None => return Ok(()), + } + } + FontStretch::System(..) => return Ok(()), + }; + + // The only variant-caps value allowed in the shorthand is small-caps (from CSS2); + // the added values defined by CSS Fonts 3 and later are not supported. + // https://www.w3.org/TR/css-fonts-4/#font-prop + if self.font_variant_caps != &font_variant_caps::get_initial_specified_value() && + *self.font_variant_caps != SmallCaps { + return Ok(()); + } + + % for name in "style variant_caps".split(): + if self.font_${name} != &font_${name}::get_initial_specified_value() { + self.font_${name}.to_css(dest)?; + dest.write_char(' ')?; + } + % endfor + + // The initial specified font-weight value of 'normal' computes as a number (400), + // not to the keyword, so we need to check for that as well in order to properly + // serialize the computed style. + if self.font_weight != &FontWeight::normal() && + self.font_weight != &FontWeight::from_gecko_keyword(400) { + self.font_weight.to_css(dest)?; + dest.write_char(' ')?; + } + + if font_stretch != FontStretchKeyword::Normal { + font_stretch.to_css(dest)?; + dest.write_char(' ')?; + } + + self.font_size.to_css(dest)?; + + if *self.line_height != LineHeight::normal() { + dest.write_str(" / ")?; + self.line_height.to_css(dest)?; + } + + dest.write_char(' ')?; + self.font_family.to_css(dest)?; + + Ok(()) + } + } + + impl<'a> LonghandsToSerialize<'a> { + % if engine == "gecko": + /// Check if some or all members are system fonts + fn check_system(&self) -> CheckSystemResult { + let mut sys = None; + let mut all = true; + + % for prop in SYSTEM_FONT_LONGHANDS: + % if prop == "font_optical_sizing" or prop == "font_variation_settings": + if let Some(value) = self.${prop} { + % else: + { + let value = self.${prop}; + % endif + match value.get_system() { + Some(s) => { + debug_assert!(sys.is_none() || s == sys.unwrap()); + sys = Some(s); + } + None => { + all = false; + } + } + } + % endfor + if self.line_height != &LineHeight::normal() { + all = false + } + if all { + CheckSystemResult::AllSystem(sys.unwrap()) + } else if sys.is_some() { + CheckSystemResult::SomeSystem + } else { + CheckSystemResult::None + } + } + % endif + } + + <% + subprops_for_value_info = ["font_style", "font_weight", "font_stretch", + "font_variant_caps", "font_size", "font_family"] + subprops_for_value_info = [ + "<longhands::{}::SpecifiedValue as SpecifiedValueInfo>".format(p) + for p in subprops_for_value_info + ] + %> + impl SpecifiedValueInfo for Longhands { + const SUPPORTED_TYPES: u8 = 0 + % for p in subprops_for_value_info: + | ${p}::SUPPORTED_TYPES + % endfor + ; + + fn collect_completion_keywords(f: KeywordsCollectFn) { + % for p in subprops_for_value_info: + ${p}::collect_completion_keywords(f); + % endfor + <SystemFont as SpecifiedValueInfo>::collect_completion_keywords(f); + } + } +</%helpers:shorthand> + +<%helpers:shorthand name="font-variant" + engines="gecko servo-2013" + flags="SHORTHAND_IN_GETCS" + sub_properties="font-variant-caps + ${'font-variant-alternates' if engine == 'gecko' else ''} + ${'font-variant-east-asian' if engine == 'gecko' else ''} + ${'font-variant-emoji' if engine == 'gecko' else ''} + ${'font-variant-ligatures' if engine == 'gecko' else ''} + ${'font-variant-numeric' if engine == 'gecko' else ''} + ${'font-variant-position' if engine == 'gecko' else ''}" + spec="https://drafts.csswg.org/css-fonts-3/#propdef-font-variant"> +% if engine == 'gecko': + <% sub_properties = "ligatures caps alternates numeric east_asian position emoji".split() %> +% else: + <% sub_properties = ["caps"] %> +% endif + +% for prop in sub_properties: + use crate::properties::longhands::font_variant_${prop}; +% endfor + #[allow(unused_imports)] + use crate::values::specified::FontVariantLigatures; + + pub fn parse_value<'i, 't>( + context: &ParserContext, + input: &mut Parser<'i, 't>, + ) -> Result<Longhands, ParseError<'i>> { + % for prop in sub_properties: + let mut ${prop} = None; + % endfor + + if input.try_parse(|input| input.expect_ident_matching("normal")).is_ok() { + // Leave the values to None, 'normal' is the initial value for all the sub properties. + } else if input.try_parse(|input| input.expect_ident_matching("none")).is_ok() { + // The 'none' value sets 'font-variant-ligatures' to 'none' and resets all other sub properties + // to their initial value. + % if engine == "gecko": + ligatures = Some(FontVariantLigatures::NONE); + % endif + } else { + let mut has_custom_value: bool = false; + loop { + if input.try_parse(|input| input.expect_ident_matching("normal")).is_ok() || + input.try_parse(|input| input.expect_ident_matching("none")).is_ok() { + return Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError)) + } + % for prop in sub_properties: + if ${prop}.is_none() { + if let Ok(value) = input.try_parse(|i| font_variant_${prop}::parse(context, i)) { + has_custom_value = true; + ${prop} = Some(value); + continue + } + } + % endfor + + break + } + + if !has_custom_value { + return Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError)) + } + } + + Ok(expanded! { + % for prop in sub_properties: + font_variant_${prop}: unwrap_or_initial!(font_variant_${prop}, ${prop}), + % endfor + }) + } + + impl<'a> ToCss for LonghandsToSerialize<'a> { + #[allow(unused_assignments)] + fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result where W: fmt::Write { + + let has_none_ligatures = + % if engine == "gecko": + self.font_variant_ligatures == &FontVariantLigatures::NONE; + % else: + false; + % endif + + const TOTAL_SUBPROPS: usize = ${len(sub_properties)}; + let mut nb_normals = 0; + % for prop in sub_properties: + % if prop == "emoji": + if let Some(value) = self.font_variant_${prop} { + % else: + { + let value = self.font_variant_${prop}; + % endif + if value == &font_variant_${prop}::get_initial_specified_value() { + nb_normals += 1; + } + } + % if prop == "emoji": + else { + // The property was disabled, so we count it as 'normal' for the purpose + // of deciding how the shorthand can be serialized. + nb_normals += 1; + } + % endif + % endfor + + + if nb_normals > 0 && nb_normals == TOTAL_SUBPROPS { + dest.write_str("normal")?; + } else if has_none_ligatures { + if nb_normals == TOTAL_SUBPROPS - 1 { + // Serialize to 'none' if 'font-variant-ligatures' is set to 'none' and all other + // font feature properties are reset to their initial value. + dest.write_str("none")?; + } else { + return Ok(()) + } + } else { + let mut has_any = false; + % for prop in sub_properties: + % if prop == "emoji": + if let Some(value) = self.font_variant_${prop} { + % else: + { + let value = self.font_variant_${prop}; + % endif + if value != &font_variant_${prop}::get_initial_specified_value() { + if has_any { + dest.write_char(' ')?; + } + has_any = true; + value.to_css(dest)?; + } + } + % endfor + } + + Ok(()) + } + } +</%helpers:shorthand> + +<%helpers:shorthand name="font-synthesis" + engines="gecko" + flags="SHORTHAND_IN_GETCS" + sub_properties="font-synthesis-weight font-synthesis-style font-synthesis-small-caps" + derive_value_info="False" + spec="https://drafts.csswg.org/css-fonts-3/#propdef-font-variant"> + <% sub_properties = ["weight", "style", "small_caps"] %> + + use crate::values::specified::FontSynthesis; + + pub fn parse_value<'i, 't>( + _context: &ParserContext, + input: &mut Parser<'i, 't>, + ) -> Result<Longhands, ParseError<'i>> { + % for prop in sub_properties: + let mut ${prop} = FontSynthesis::None; + % endfor + + if input.try_parse(|input| input.expect_ident_matching("none")).is_ok() { + // Leave all the individual values as None + } else { + let mut has_custom_value = false; + while !input.is_exhausted() { + try_match_ident_ignore_ascii_case! { input, + % for prop in sub_properties: + "${prop.replace('_', '-')}" if ${prop} == FontSynthesis::None => { + has_custom_value = true; + ${prop} = FontSynthesis::Auto; + continue; + }, + % endfor + } + } + if !has_custom_value { + return Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError)); + } + } + + Ok(expanded! { + % for prop in sub_properties: + font_synthesis_${prop}: ${prop}, + % endfor + }) + } + + impl<'a> ToCss for LonghandsToSerialize<'a> { + fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result where W: fmt::Write { + let mut has_any = false; + + % for prop in sub_properties: + if self.font_synthesis_${prop} == &FontSynthesis::Auto { + if has_any { + dest.write_char(' ')?; + } + has_any = true; + dest.write_str("${prop.replace('_', '-')}")?; + } + % endfor + + if !has_any { + dest.write_str("none")?; + } + + Ok(()) + } + } + + // The shorthand takes the sub-property names of the longhands, and not the + // 'auto' keyword like they do, so we can't automatically derive this. + impl SpecifiedValueInfo for Longhands { + fn collect_completion_keywords(f: KeywordsCollectFn) { + f(&[ + "none", + % for prop in sub_properties: + "${prop.replace('_', '-')}", + % endfor + ]); + } + } +</%helpers:shorthand> |