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style: [css-properties-values-api] Parsing and serialization for @property syntax descriptor
Based off of @emilio's syntax parser at <https://github.com/emilio/css-typed-om-syntax>. Co-authored-by: Emilio Cobos Álvarez <emilio@crisal.io> Differential Revision: https://phabricator.services.mozilla.com/D178268
This commit is contained in:
parent
8823b63513
commit
87ce7045ef
13 changed files with 522 additions and 14 deletions
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@ -45,7 +45,7 @@ fn rgb_to_hue_min_max(red: f32, green: f32, blue: f32) -> (f32, f32, f32) {
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(red - green) / delta + 4.0
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}
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} else {
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std::f32::NAN
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f32::NAN
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};
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(hue, min, max)
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@ -107,6 +107,7 @@ pub mod media_queries;
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pub mod parallel;
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pub mod parser;
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pub mod piecewise_linear;
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pub mod properties_and_values;
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#[macro_use]
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pub mod queries;
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pub mod rule_cache;
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9
components/style/properties_and_values/mod.rs
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9
components/style/properties_and_values/mod.rs
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@ -0,0 +1,9 @@
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
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//! Properties and Values
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//!
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//! https://drafts.css-houdini.org/css-properties-values-api-1/
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pub mod syntax;
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60
components/style/properties_and_values/syntax/ascii.rs
Normal file
60
components/style/properties_and_values/syntax/ascii.rs
Normal file
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@ -0,0 +1,60 @@
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
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/// Trims ASCII whitespace characters from a slice, and returns the trimmed input.
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pub fn trim_ascii_whitespace(input: &str) -> &str {
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if input.is_empty() {
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return input;
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}
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let mut start = 0;
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{
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let mut iter = input.as_bytes().iter();
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loop {
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let byte = match iter.next() {
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Some(b) => b,
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None => return "",
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};
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if !byte.is_ascii_whitespace() {
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break;
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}
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start += 1;
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}
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}
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let mut end = input.len();
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assert!(start < end);
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{
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let mut iter = input.as_bytes()[start..].iter().rev();
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loop {
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let byte = match iter.next() {
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Some(b) => b,
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None => {
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debug_assert!(false, "We should have caught this in the loop above!");
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return "";
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},
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};
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if !byte.is_ascii_whitespace() {
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break;
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}
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end -= 1;
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}
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}
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&input[start..end]
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}
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#[test]
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fn trim_ascii_whitespace_test() {
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fn test(i: &str, o: &str) {
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assert_eq!(trim_ascii_whitespace(i), o)
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}
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test("", "");
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test(" ", "");
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test(" a b c ", "a b c");
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test(" \t \t \ta b c \t \t \t \t", "a b c");
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}
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91
components/style/properties_and_values/syntax/data_type.rs
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91
components/style/properties_and_values/syntax/data_type.rs
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
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use super::{Component, ComponentName, Multiplier};
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/// <https://drafts.css-houdini.org/css-properties-values-api-1/#supported-names>
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#[derive(Clone, Copy, Debug, MallocSizeOf, PartialEq)]
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pub enum DataType {
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/// Any valid `<length>` value
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Length,
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/// `<number>` values
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Number,
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/// Any valid <percentage> value
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Percentage,
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/// Any valid `<length>` or `<percentage>` value, any valid `<calc()>` expression combining
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/// `<length>` and `<percentage>` components.
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LengthPercentage,
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/// Any valid `<color>` value
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Color,
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/// Any valid `<image>` value
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Image,
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/// Any valid `<url>` value
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Url,
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/// Any valid `<integer>` value
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Integer,
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/// Any valid `<angle>` value
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Angle,
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/// Any valid `<time>` value
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Time,
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/// Any valid `<resolution>` value
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Resolution,
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/// Any valid `<transform-function>` value
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TransformFunction,
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/// A list of valid `<transform-function>` values. Note that "<transform-list>" is a pre-multiplied
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/// data type name equivalent to "<transform-function>+"
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TransformList,
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/// Any valid `<custom-ident>` value
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CustomIdent,
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}
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impl DataType {
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pub fn unpremultiply(&self) -> Option<Component> {
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match *self {
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DataType::TransformList => Some(Component {
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name: ComponentName::DataType(DataType::TransformFunction),
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multiplier: Some(Multiplier::Space),
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}),
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_ => None,
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}
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}
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pub fn from_str(ty: &str) -> Option<Self> {
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Some(match ty.as_bytes() {
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b"length" => DataType::Length,
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b"number" => DataType::Number,
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b"percentage" => DataType::Percentage,
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b"length-percentage" => DataType::LengthPercentage,
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b"color" => DataType::Color,
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b"image" => DataType::Image,
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b"url" => DataType::Url,
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b"integer" => DataType::Integer,
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b"angle" => DataType::Angle,
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b"time" => DataType::Time,
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b"resolution" => DataType::Resolution,
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b"transform-function" => DataType::TransformFunction,
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b"custom-ident" => DataType::CustomIdent,
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b"transform-list" => DataType::TransformList,
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_ => return None,
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})
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}
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pub fn to_str(&self) -> &str {
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match self {
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DataType::Length => "length",
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DataType::Number => "number",
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DataType::Percentage => "percentage",
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DataType::LengthPercentage => "length-percentage",
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DataType::Color => "color",
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DataType::Image => "image",
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DataType::Url => "url",
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DataType::Integer => "integer",
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DataType::Angle => "angle",
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DataType::Time => "time",
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DataType::Resolution => "resolution",
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DataType::TransformFunction => "transform-function",
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DataType::CustomIdent => "custom-ident",
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DataType::TransformList => "transform-list",
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}
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}
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}
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328
components/style/properties_and_values/syntax/mod.rs
Normal file
328
components/style/properties_and_values/syntax/mod.rs
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@ -0,0 +1,328 @@
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
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//! Used for parsing and serializing the [`@property`] syntax string.
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//!
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//! <https://drafts.css-houdini.org/css-properties-values-api-1/#parsing-syntax>
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use std::fmt::{self, Debug};
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use std::{borrow::Cow, fmt::Write};
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use crate::parser::{Parse, ParserContext};
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use crate::values::CustomIdent;
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use cssparser::{Parser as CSSParser, ParserInput as CSSParserInput};
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use style_traits::{
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CssWriter, ParseError as StyleParseError, PropertySyntaxParseError as ParseError,
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StyleParseErrorKind, ToCss,
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};
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use self::data_type::DataType;
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mod ascii;
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mod data_type;
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/// <https://drafts.css-houdini.org/css-properties-values-api-1/#parsing-syntax>
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#[derive(Debug, Clone, MallocSizeOf)]
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pub struct Descriptor {
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components: Box<[Component]>,
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css: String,
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}
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impl Descriptor {
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/// Returns the universal syntax definition with the given CSS representation.
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fn universal(css: &str) -> Self {
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Self {
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components: Default::default(),
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css: String::from(css),
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}
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}
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/// Returns the specified syntax string.
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pub fn as_str(&self) -> &str {
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&self.css
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}
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}
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impl PartialEq for Descriptor {
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fn eq(&self, other: &Self) -> bool {
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self.components == other.components
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}
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}
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impl Parse for Descriptor {
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/// Parse a syntax descriptor.
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fn parse<'i, 't>(
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_context: &ParserContext,
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parser: &mut CSSParser<'i, 't>,
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) -> Result<Self, StyleParseError<'i>> {
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// 1. Strip leading and trailing ASCII whitespace from string.
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let input = parser.expect_string()?;
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match parse_descriptor(input) {
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Ok(syntax) => Ok(syntax),
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Err(err) => Err(parser.new_custom_error(StyleParseErrorKind::PropertySyntaxField(err))),
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}
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}
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}
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impl ToCss for Descriptor {
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fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
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where
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W: Write,
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{
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self.css.to_css(dest)
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}
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}
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/// <https://drafts.css-houdini.org/css-properties-values-api-1/#multipliers>
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#[derive(Clone, Copy, Debug, MallocSizeOf, PartialEq)]
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pub enum Multiplier {
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/// Indicates a space-separated list.
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Space,
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/// Indicates a comma-separated list.
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Comma,
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}
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/// <https://drafts.css-houdini.org/css-properties-values-api-1/#syntax-component>
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#[derive(Clone, Debug, MallocSizeOf, PartialEq)]
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pub struct Component {
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name: ComponentName,
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multiplier: Option<Multiplier>,
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}
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impl Component {
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/// Returns the component's name.
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#[inline]
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pub fn name(&self) -> &ComponentName {
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&self.name
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}
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/// Returns the component's multiplier, if one exists.
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#[inline]
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pub fn multiplier(&self) -> Option<Multiplier> {
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self.multiplier
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}
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/// If the component is premultiplied, return the un-premultiplied component.
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#[inline]
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pub fn unpremultiplied(&self) -> Cow<Self> {
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match self.name.unpremultiply() {
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Some(component) => {
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debug_assert!(
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self.multiplier.is_none(),
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"Shouldn't have parsed a multiplier for a pre-multiplied data type name",
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);
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Cow::Owned(component)
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},
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None => Cow::Borrowed(self),
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}
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}
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}
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/// <https://drafts.css-houdini.org/css-properties-values-api-1/#syntax-component-name>
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#[derive(Clone, Debug, MallocSizeOf, PartialEq)]
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pub enum ComponentName {
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/// <https://drafts.css-houdini.org/css-properties-values-api-1/#data-type-name>
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DataType(DataType),
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/// <https://drafts.csswg.org/css-values-4/#custom-idents>
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Ident(CustomIdent),
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}
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impl ComponentName {
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fn unpremultiply(&self) -> Option<Component> {
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match *self {
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ComponentName::DataType(ref t) => t.unpremultiply(),
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ComponentName::Ident(..) => None,
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}
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}
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/// <https://drafts.css-houdini.org/css-properties-values-api-1/#pre-multiplied-data-type-name>
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fn is_pre_multiplied(&self) -> bool {
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self.unpremultiply().is_some()
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}
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}
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/// Parse a syntax descriptor.
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#[inline]
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fn parse_descriptor(css: &str) -> Result<Descriptor, ParseError> {
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// 1. Strip leading and trailing ASCII whitespace from string.
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let input = ascii::trim_ascii_whitespace(css);
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// 2. If string's length is 0, return failure.
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if input.is_empty() {
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return Err(ParseError::EmptyInput);
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}
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// 3. If string's length is 1, and the only code point in string is U+002A
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// ASTERISK (*), return the universal syntax descriptor.
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if input.len() == 1 && input.as_bytes()[0] == b'*' {
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return Ok(Descriptor::universal(css));
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}
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// 4. Let stream be an input stream created from the code points of string,
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// preprocessed as specified in [css-syntax-3]. Let descriptor be an
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// initially empty list of syntax components.
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//
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// NOTE(emilio): Instead of preprocessing we cheat and treat new-lines and
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// nulls in the parser specially.
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let mut components = vec![];
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{
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let mut parser = Parser::new(input, &mut components);
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// 5. Repeatedly consume the next input code point from stream.
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parser.parse()?;
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}
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Ok(Descriptor {
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components: components.into_boxed_slice(),
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css: String::from(css),
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})
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}
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struct Parser<'a> {
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input: &'a str,
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position: usize,
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output: &'a mut Vec<Component>,
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}
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/// <https://drafts.csswg.org/css-syntax-3/#whitespace>
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fn is_whitespace(byte: u8) -> bool {
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match byte {
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b'\t' | b'\n' | b'\r' | b' ' => true,
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_ => false,
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}
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}
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/// <https://drafts.csswg.org/css-syntax-3/#letter>
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fn is_letter(byte: u8) -> bool {
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match byte {
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b'A'..=b'Z' | b'a'..=b'z' => true,
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_ => false,
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}
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}
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|
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/// <https://drafts.csswg.org/css-syntax-3/#non-ascii-code-point>
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fn is_non_ascii(byte: u8) -> bool {
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byte >= 0x80
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}
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|
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/// <https://drafts.csswg.org/css-syntax-3/#name-start-code-point>
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fn is_name_start(byte: u8) -> bool {
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is_letter(byte) || is_non_ascii(byte) || byte == b'_'
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}
|
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|
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impl<'a> Parser<'a> {
|
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fn new(input: &'a str, output: &'a mut Vec<Component>) -> Self {
|
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Self {
|
||||
input,
|
||||
position: 0,
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||||
output,
|
||||
}
|
||||
}
|
||||
|
||||
fn peek(&self) -> Option<u8> {
|
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self.input.as_bytes().get(self.position).cloned()
|
||||
}
|
||||
|
||||
fn parse(&mut self) -> Result<(), ParseError> {
|
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// 5. Repeatedly consume the next input code point from stream:
|
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loop {
|
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let component = self.parse_component()?;
|
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self.output.push(component);
|
||||
self.skip_whitespace();
|
||||
|
||||
let byte = match self.peek() {
|
||||
None => return Ok(()),
|
||||
Some(b) => b,
|
||||
};
|
||||
|
||||
if byte != b'|' {
|
||||
return Err(ParseError::ExpectedPipeBetweenComponents);
|
||||
}
|
||||
|
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self.position += 1;
|
||||
}
|
||||
}
|
||||
|
||||
fn skip_whitespace(&mut self) {
|
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loop {
|
||||
match self.peek() {
|
||||
Some(c) if is_whitespace(c) => self.position += 1,
|
||||
_ => return,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// <https://drafts.css-houdini.org/css-properties-values-api-1/#consume-data-type-name>
|
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fn parse_data_type_name(&mut self) -> Result<DataType, ParseError> {
|
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let start = self.position;
|
||||
loop {
|
||||
let byte = match self.peek() {
|
||||
Some(b) => b,
|
||||
None => return Err(ParseError::UnclosedDataTypeName),
|
||||
};
|
||||
if byte != b'>' {
|
||||
self.position += 1;
|
||||
continue;
|
||||
}
|
||||
let ty = match DataType::from_str(&self.input[start..self.position]) {
|
||||
Some(ty) => ty,
|
||||
None => return Err(ParseError::UnknownDataTypeName),
|
||||
};
|
||||
self.position += 1;
|
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return Ok(ty);
|
||||
}
|
||||
}
|
||||
|
||||
fn parse_name(&mut self) -> Result<ComponentName, ParseError> {
|
||||
let b = match self.peek() {
|
||||
Some(b) => b,
|
||||
None => return Err(ParseError::UnexpectedEOF),
|
||||
};
|
||||
|
||||
if b == b'<' {
|
||||
self.position += 1;
|
||||
return Ok(ComponentName::DataType(self.parse_data_type_name()?));
|
||||
}
|
||||
|
||||
if b != b'\\' && !is_name_start(b) {
|
||||
return Err(ParseError::InvalidNameStart);
|
||||
}
|
||||
|
||||
let input = &self.input[self.position..];
|
||||
let mut input = CSSParserInput::new(input);
|
||||
let mut input = CSSParser::new(&mut input);
|
||||
let location = input.current_source_location();
|
||||
let name = input
|
||||
.expect_ident()
|
||||
.ok()
|
||||
.and_then(|name| CustomIdent::from_ident(location, name, &[]).ok());
|
||||
let name = match name {
|
||||
Some(name) => name,
|
||||
None => return Err(ParseError::InvalidName),
|
||||
};
|
||||
self.position += input.position().byte_index();
|
||||
return Ok(ComponentName::Ident(name));
|
||||
}
|
||||
|
||||
fn parse_multiplier(&mut self) -> Option<Multiplier> {
|
||||
let multiplier = match self.peek()? {
|
||||
b'+' => Multiplier::Space,
|
||||
b'#' => Multiplier::Comma,
|
||||
_ => return None,
|
||||
};
|
||||
self.position += 1;
|
||||
Some(multiplier)
|
||||
}
|
||||
|
||||
/// <https://drafts.css-houdini.org/css-properties-values-api-1/#consume-a-syntax-component>
|
||||
fn parse_component(&mut self) -> Result<Component, ParseError> {
|
||||
// Consume as much whitespace as possible from stream.
|
||||
self.skip_whitespace();
|
||||
let name = self.parse_name()?;
|
||||
let multiplier = if name.is_pre_multiplied() {
|
||||
None
|
||||
} else {
|
||||
self.parse_multiplier()
|
||||
};
|
||||
Ok(Component { name, multiplier })
|
||||
}
|
||||
}
|
|
@ -197,8 +197,6 @@ impl Animate for i32 {
|
|||
impl Animate for f32 {
|
||||
#[inline]
|
||||
fn animate(&self, other: &Self, procedure: Procedure) -> Result<Self, ()> {
|
||||
use std::f32;
|
||||
|
||||
let ret = (*self as f64).animate(&(*other as f64), procedure)?;
|
||||
Ok(ret.min(f32::MAX as f64).max(f32::MIN as f64) as f32)
|
||||
}
|
||||
|
@ -208,8 +206,6 @@ impl Animate for f32 {
|
|||
impl Animate for f64 {
|
||||
#[inline]
|
||||
fn animate(&self, other: &Self, procedure: Procedure) -> Result<Self, ()> {
|
||||
use std::f64;
|
||||
|
||||
let (self_weight, other_weight) = procedure.weights();
|
||||
|
||||
let ret = *self * self_weight + *other * other_weight;
|
||||
|
|
|
@ -383,8 +383,6 @@ impl Quaternion {
|
|||
|
||||
impl Animate for Quaternion {
|
||||
fn animate(&self, other: &Self, procedure: Procedure) -> Result<Self, ()> {
|
||||
use std::f64;
|
||||
|
||||
let (this_weight, other_weight) = procedure.weights();
|
||||
debug_assert!(
|
||||
// Doule EPSILON since both this_weight and other_weght have calculation errors
|
||||
|
|
|
@ -26,7 +26,7 @@ impl ToComputedValue for specified::AnimationIterationCount {
|
|||
fn to_computed_value(&self, context: &Context) -> Self::ComputedValue {
|
||||
AnimationIterationCount(match *self {
|
||||
specified::AnimationIterationCount::Number(n) => n.to_computed_value(context).0,
|
||||
specified::AnimationIterationCount::Infinite => std::f32::INFINITY,
|
||||
specified::AnimationIterationCount::Infinite => f32::INFINITY,
|
||||
})
|
||||
}
|
||||
|
||||
|
|
|
@ -168,7 +168,7 @@ impl<L> GenericPerspectiveFunction<L> {
|
|||
/// Returns `f32::INFINITY` or the result of a function on the length value.
|
||||
pub fn infinity_or(&self, f: impl FnOnce(&L) -> f32) -> f32 {
|
||||
match *self {
|
||||
Self::None => std::f32::INFINITY,
|
||||
Self::None => f32::INFINITY,
|
||||
Self::Length(ref l) => f(l),
|
||||
}
|
||||
}
|
||||
|
@ -471,7 +471,6 @@ where
|
|||
reference_box: Option<&Rect<ComputedLength>>,
|
||||
) -> Result<Transform3D<f64>, ()> {
|
||||
use self::TransformOperation::*;
|
||||
use std::f64;
|
||||
|
||||
let reference_width = reference_box.map(|v| v.size.width);
|
||||
let reference_height = reference_box.map(|v| v.size.height);
|
||||
|
@ -501,7 +500,7 @@ where
|
|||
},
|
||||
Perspective(ref p) => {
|
||||
let px = match p {
|
||||
PerspectiveFunction::None => std::f32::INFINITY,
|
||||
PerspectiveFunction::None => f32::INFINITY,
|
||||
PerspectiveFunction::Length(ref p) => p.to_pixel_length(None)?,
|
||||
};
|
||||
create_perspective_matrix(px).cast()
|
||||
|
|
|
@ -20,7 +20,6 @@ use crate::values::serialize_atom_identifier;
|
|||
use crate::values::specified::calc::CalcNode;
|
||||
use crate::{Atom, Namespace, One, Prefix, Zero};
|
||||
use cssparser::{Parser, Token};
|
||||
use std::f32;
|
||||
use std::fmt::{self, Write};
|
||||
use std::ops::Add;
|
||||
use style_traits::values::specified::AllowedNumericType;
|
||||
|
|
|
@ -996,8 +996,8 @@ fn parse_number(iter: &mut Peekable<Cloned<slice::Iter<u8>>>) -> Result<CSSFloat
|
|||
|
||||
if value.is_finite() {
|
||||
Ok(value
|
||||
.min(::std::f32::MAX as f64)
|
||||
.max(::std::f32::MIN as f64) as CSSFloat)
|
||||
.min(f32::MAX as f64)
|
||||
.max(f32::MIN as f64) as CSSFloat)
|
||||
} else {
|
||||
Err(())
|
||||
}
|
||||
|
|
|
@ -113,6 +113,8 @@ pub enum StyleParseErrorKind<'i> {
|
|||
RangedExpressionWithNoValue,
|
||||
/// A function was encountered that was not expected.
|
||||
UnexpectedFunction(CowRcStr<'i>),
|
||||
/// Error encountered parsing a @property's `syntax` descriptor
|
||||
PropertySyntaxField(PropertySyntaxParseError),
|
||||
/// @namespace must be before any rule but @charset and @import
|
||||
UnexpectedNamespaceRule,
|
||||
/// @import must be before any rule but @charset
|
||||
|
@ -196,6 +198,31 @@ impl<'i> StyleParseErrorKind<'i> {
|
|||
}
|
||||
}
|
||||
|
||||
/// Errors that can be encountered while parsing the @property rule's syntax descriptor.
|
||||
#[derive(Clone, Debug, PartialEq)]
|
||||
pub enum PropertySyntaxParseError {
|
||||
/// The string's length was 0.
|
||||
EmptyInput,
|
||||
/// A non-whitespace, non-pipe character was fount after parsing a component.
|
||||
ExpectedPipeBetweenComponents,
|
||||
/// The start of an identifier was expected but not found.
|
||||
///
|
||||
/// <https://drafts.csswg.org/css-syntax-3/#name-start-code-point>
|
||||
InvalidNameStart,
|
||||
/// The name is not a valid `<ident>`.
|
||||
InvalidName,
|
||||
/// The data type name was not closed.
|
||||
///
|
||||
/// <https://drafts.css-houdini.org/css-properties-values-api-1/#consume-data-type-name>
|
||||
UnclosedDataTypeName,
|
||||
/// The next byte was expected while parsing, but EOF was found instead.
|
||||
UnexpectedEOF,
|
||||
/// The data type is not a supported syntax component name.
|
||||
///
|
||||
/// <https://drafts.css-houdini.org/css-properties-values-api-1/#supported-names>
|
||||
UnknownDataTypeName,
|
||||
}
|
||||
|
||||
bitflags! {
|
||||
/// The mode to use when parsing values.
|
||||
pub struct ParsingMode: u8 {
|
||||
|
|
Loading…
Add table
Add a link
Reference in a new issue