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products/Sources/formale Sprachen/C/LibreOffice/extensions/source/ole/   (LibreOffice Version 25.8.3.2©)  Datei vom 5.10.2025 mit Größe 124 kB image not shown  

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component.rs


products/Sources/formale Sprachen/C/Firefox/servo/components/style/color/component.rs

/* 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/. */ //! Parse/serialize and resolve a single color component. use std::fmt::Write; use super::{ parsing::{rcs_enabled, ChannelKeyword}, AbsoluteColor, }; use crate::{ parser::ParserContext, values::{ animated::ToAnimatedValue, generics::calc::{CalcUnits, GenericCalcNode}, specified::calc::{AllowParse, Leaf}, }, }; use cssparser::{color::OPAQUE, Parser, Token}; use style_traits::{ParseError, ToCss}; /// A single color component. #[derive(Clone, Debug, MallocSizeOf, PartialEq, ToShmem)] #[repr(u8)] pub enum ColorComponent { /// The "none" keyword. None, /// A absolute value. Value(ValueType), /// A channel keyword, e.g. `r`, `l`, `alpha`, etc. ChannelKeyword(ChannelKeyword), /// A calc() value. Calc(Box>), /// Used when alpha components are not specified. AlphaOmitted, } impl ColorComponent { /// Return true if the component is "none". #[inline] pub fn is_none(&self) -> bool { matches!(self, Self::None) } } /// An utility trait that allows the construction of [ColorComponent] /// `ValueType`'s after parsing a color component. pub trait ColorComponentType: Sized + Clone { // TODO(tlouw): This function should be named according to the rules in the spec // stating that all the values coming from color components are // numbers and that each has their own rules dependeing on types. /// Construct a new component from a single value. fn from_value(value: f32) -> Self; /// Return the [CalcUnits] flags that the impl can handle. fn units() -> CalcUnits; /// Try to create a new component from the given token. fn try_from_token(token: &Token) -> Result; /// Try to create a new component from the given [CalcNodeLeaf] that was /// resolved from a [CalcNode]. fn try_from_leaf(leaf: &Leaf) -> Result; } impl ColorComponent { /// Parse a single [ColorComponent]. pub fn parse<'i, 't>( context: &ParserContext, input: &mut Parser<'i, 't>, allow_none: bool, ) -> Result> { let location = input.current_source_location(); match *input.next()? { Token::Ident(ref value) if allow_none && value.eq_ignore_ascii_case("none") => { Ok(ColorComponent::None) }, ref t @ Token::Ident(ref ident) => { let Ok(channel_keyword) = ChannelKeyword::from_ident(ident) else { return Err(location.new_unexpected_token_error(t.clone())); }; Ok(ColorComponent::ChannelKeyword(channel_keyword)) }, Token::Function(ref name) => { let function = GenericCalcNode::math_function(context, name, location)?; let allow = AllowParse::new(if rcs_enabled() { ValueType::units() | CalcUnits::COLOR_COMPONENT } else { ValueType::units() }); let node = GenericCalcNode::parse(context, input, function, allow)?; debug_assert!(!node.has_anchor_function, "Anchor function used for color?"); let mut node = node.node; // TODO(tlouw): We only have to simplify the node when we have to store it, but we // only know if we have to store it much later when the whole color // can't be resolved to absolute at which point the calc nodes are // burried deep in a [ColorFunction] struct. node.simplify_and_sort(); Ok(Self::Calc(Box::new(node))) }, ref t => ValueType::try_from_token(t) .map(Self::Value) .map_err(|_| location.new_unexpected_token_error(t.clone())), } } /// Resolve a [ColorComponent] into a float. None is "none". pub fn resolve(&self, origin_color: Option<&AbsoluteColor>) -> Result, ()> { Ok(match self { ColorComponent::None => None, ColorComponent::Value(value) => Some(value.clone()), ColorComponent::ChannelKeyword(channel_keyword) => match origin_color { Some(origin_color) => { let value = origin_color.get_component_by_channel_keyword(*channel_keyword)?; Some(ValueType::from_value(value.unwrap_or(0.0))) }, None => return Err(()), }, ColorComponent::Calc(node) => { let Ok(resolved_leaf) = node.resolve_map( |leaf| { Ok(match leaf { Leaf::ColorComponent(channel_keyword) => match origin_color { Some(origin_color) => { let value = origin_color .get_component_by_channel_keyword(*channel_keyword)?; Leaf::Number(value.unwrap_or(0.0)) }, None => return Err(()), }, l => l.clone(), }) }, |_| Err(()), ) else { return Err(()); }; Some(ValueType::try_from_leaf(&resolved_leaf)?) }, ColorComponent::AlphaOmitted => { if let Some(origin_color) = origin_color { // // If the alpha value of the relative color is omitted, it defaults to that of // the origin color (rather than defaulting to 100%, as it does in the absolute // syntax). origin_color.alpha().map(ValueType::from_value) } else { Some(ValueType::from_value(OPAQUE)) } }, }) } } impl ToCss for ColorComponent { fn to_css(&self, dest: &mut style_traits::CssWriter) -> std::fmt::Result where W: Write, { match self { ColorComponent::None => dest.write_str("none")?, ColorComponent::Value(value) => value.to_css(dest)?, ColorComponent::ChannelKeyword(channel_keyword) => channel_keyword.to_css(dest)?, ColorComponent::Calc(node) => { // When we only have a channel keyword in a leaf node, we should serialize it with // calc(..), except when one of the rgb color space functions are used, e.g. // rgb(..), hsl(..) or hwb(..) for historical reasons. // node.to_css(dest)?; }, ColorComponent::AlphaOmitted => { debug_assert!(false, "can't serialize an omitted alpha component"); }, } Ok(()) } } impl ToAnimatedValue for ColorComponent { type AnimatedValue = Self; fn to_animated_value(self, _context: &crate::values::animated::Context) -> Self::AnimatedValue { self } fn from_animated_value(animated: Self::AnimatedValue) -> Self { animated } }

                                                                                                                                                                                                                                                                                                                                                                                                     

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