summaryrefslogtreecommitdiffstats
path: root/servo/components/style/stylesheets/font_palette_values_rule.rs
blob: 400d3482153a9538b03884c00ab665faf7ea9fd8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
/* 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/. */

//! The [`@font-palette-values`][font-palette-values] at-rule.
//!
//! [font-palette-values]: https://drafts.csswg.org/css-fonts/#font-palette-values

use crate::error_reporting::ContextualParseError;
use crate::gecko_bindings::bindings::Gecko_AppendPaletteValueHashEntry;
use crate::gecko_bindings::bindings::{Gecko_SetFontPaletteBase, Gecko_SetFontPaletteOverride};
use crate::gecko_bindings::structs::gfx::FontPaletteValueSet;
use crate::gecko_bindings::structs::gfx::FontPaletteValueSet_PaletteValues_kDark;
use crate::gecko_bindings::structs::gfx::FontPaletteValueSet_PaletteValues_kLight;
use crate::parser::{Parse, ParserContext};
use crate::shared_lock::{SharedRwLockReadGuard, ToCssWithGuard};
use crate::str::CssStringWriter;
use crate::stylesheets::font_feature_values_rule::parse_family_name_list;
use crate::values::computed::font::FamilyName;
use crate::values::specified::Color as SpecifiedColor;
use crate::values::specified::NonNegativeInteger;
use crate::values::DashedIdent;
use cssparser::{
    AtRuleParser, CowRcStr, DeclarationParser, Parser, QualifiedRuleParser, RuleBodyItemParser,
    RuleBodyParser, SourceLocation,
};
use selectors::parser::SelectorParseErrorKind;
use std::fmt::{self, Write};
use style_traits::{Comma, OneOrMoreSeparated};
use style_traits::{CssWriter, ParseError, StyleParseErrorKind, ToCss};

#[allow(missing_docs)]
#[derive(Clone, Debug, MallocSizeOf, PartialEq, ToShmem)]
pub struct FontPaletteOverrideColor {
    index: NonNegativeInteger,
    color: SpecifiedColor,
}

impl Parse for FontPaletteOverrideColor {
    fn parse<'i, 't>(
        context: &ParserContext,
        input: &mut Parser<'i, 't>,
    ) -> Result<FontPaletteOverrideColor, ParseError<'i>> {
        let index = NonNegativeInteger::parse(context, input)?;
        let location = input.current_source_location();
        let color = SpecifiedColor::parse(context, input)?;
        // Only absolute colors are accepted here.
        if let SpecifiedColor::Absolute { .. } = color {
            Ok(FontPaletteOverrideColor { index, color })
        } else {
            Err(location.new_custom_error(StyleParseErrorKind::UnspecifiedError))
        }
    }
}

impl ToCss for FontPaletteOverrideColor {
    fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
    where
        W: fmt::Write,
    {
        self.index.to_css(dest)?;
        dest.write_char(' ')?;
        self.color.to_css(dest)
    }
}

impl OneOrMoreSeparated for FontPaletteOverrideColor {
    type S = Comma;
}

impl OneOrMoreSeparated for FamilyName {
    type S = Comma;
}

#[allow(missing_docs)]
#[derive(Clone, Debug, MallocSizeOf, Parse, PartialEq, ToCss, ToShmem)]
pub enum FontPaletteBase {
    Light,
    Dark,
    Index(NonNegativeInteger),
}

/// The [`@font-palette-values`][font-palette-values] at-rule.
///
/// [font-palette-values]: https://drafts.csswg.org/css-fonts/#font-palette-values
#[derive(Clone, Debug, PartialEq, ToShmem)]
pub struct FontPaletteValuesRule {
    /// Palette name.
    pub name: DashedIdent,
    /// Font family list for @font-palette-values rule.
    /// Family names cannot contain generic families. FamilyName
    /// also accepts only non-generic names.
    pub family_names: Vec<FamilyName>,
    /// The base palette.
    pub base_palette: Option<FontPaletteBase>,
    /// The list of override colors.
    pub override_colors: Vec<FontPaletteOverrideColor>,
    /// The line and column of the rule's source code.
    pub source_location: SourceLocation,
}

impl FontPaletteValuesRule {
    /// Creates an empty FontPaletteValuesRule with given location and name.
    fn new(name: DashedIdent, location: SourceLocation) -> Self {
        FontPaletteValuesRule {
            name,
            family_names: vec![],
            base_palette: None,
            override_colors: vec![],
            source_location: location,
        }
    }

    /// Parses a `FontPaletteValuesRule`.
    pub fn parse(
        context: &ParserContext,
        input: &mut Parser,
        name: DashedIdent,
        location: SourceLocation,
    ) -> Self {
        let mut rule = FontPaletteValuesRule::new(name, location);
        let mut parser = FontPaletteValuesDeclarationParser {
            context,
            rule: &mut rule,
        };
        let mut iter = RuleBodyParser::new(input, &mut parser);
        while let Some(declaration) = iter.next() {
            if let Err((error, slice)) = declaration {
                let location = error.location;
                let error =
                    ContextualParseError::UnsupportedFontPaletteValuesDescriptor(slice, error);
                context.log_css_error(location, error);
            }
        }
        rule
    }

    /// Prints inside of `@font-palette-values` block.
    fn value_to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
    where
        W: Write,
    {
        if !self.family_names.is_empty() {
            dest.write_str("font-family: ")?;
            self.family_names.to_css(dest)?;
            dest.write_str("; ")?;
        }
        if let Some(base) = &self.base_palette {
            dest.write_str("base-palette: ")?;
            base.to_css(dest)?;
            dest.write_str("; ")?;
        }
        if !self.override_colors.is_empty() {
            dest.write_str("override-colors: ")?;
            self.override_colors.to_css(dest)?;
            dest.write_str("; ")?;
        }
        Ok(())
    }

    /// Convert to Gecko FontPaletteValueSet.
    pub fn to_gecko_palette_value_set(&self, dest: *mut FontPaletteValueSet) {
        for ref family in self.family_names.iter() {
            let family = family.name.to_ascii_lowercase();
            let palette_values = unsafe {
                Gecko_AppendPaletteValueHashEntry(dest, family.as_ptr(), self.name.0.as_ptr())
            };
            if let Some(base_palette) = &self.base_palette {
                unsafe {
                    Gecko_SetFontPaletteBase(
                        palette_values,
                        match &base_palette {
                            FontPaletteBase::Light => FontPaletteValueSet_PaletteValues_kLight,
                            FontPaletteBase::Dark => FontPaletteValueSet_PaletteValues_kDark,
                            FontPaletteBase::Index(i) => i.0.value() as i32,
                        },
                    );
                }
            }
            for c in &self.override_colors {
                if let SpecifiedColor::Absolute(ref absolute) = c.color {
                    unsafe {
                        Gecko_SetFontPaletteOverride(
                            palette_values,
                            c.index.0.value(),
                            (&absolute.color) as *const _ as *mut _,
                        );
                    }
                }
            }
        }
    }
}

impl ToCssWithGuard for FontPaletteValuesRule {
    fn to_css(&self, _guard: &SharedRwLockReadGuard, dest: &mut CssStringWriter) -> fmt::Result {
        dest.write_str("@font-palette-values ")?;
        self.name.to_css(&mut CssWriter::new(dest))?;
        dest.write_str(" { ")?;
        self.value_to_css(&mut CssWriter::new(dest))?;
        dest.write_char('}')
    }
}

/// Parser for declarations in `FontPaletteValuesRule`.
struct FontPaletteValuesDeclarationParser<'a> {
    context: &'a ParserContext<'a>,
    rule: &'a mut FontPaletteValuesRule,
}

impl<'a, 'i> AtRuleParser<'i> for FontPaletteValuesDeclarationParser<'a> {
    type Prelude = ();
    type AtRule = ();
    type Error = StyleParseErrorKind<'i>;
}

impl<'a, 'i> QualifiedRuleParser<'i> for FontPaletteValuesDeclarationParser<'a> {
    type Prelude = ();
    type QualifiedRule = ();
    type Error = StyleParseErrorKind<'i>;
}

fn parse_override_colors<'i, 't>(
    context: &ParserContext,
    input: &mut Parser<'i, 't>,
) -> Result<Vec<FontPaletteOverrideColor>, ParseError<'i>> {
    input.parse_comma_separated(|i| FontPaletteOverrideColor::parse(context, i))
}

impl<'a, 'b, 'i> DeclarationParser<'i> for FontPaletteValuesDeclarationParser<'a> {
    type Declaration = ();
    type Error = StyleParseErrorKind<'i>;

    fn parse_value<'t>(
        &mut self,
        name: CowRcStr<'i>,
        input: &mut Parser<'i, 't>,
    ) -> Result<(), ParseError<'i>> {
        match_ignore_ascii_case! { &*name,
            "font-family" => {
                self.rule.family_names = parse_family_name_list(self.context, input)?
            },
            "base-palette" => {
                self.rule.base_palette = Some(input.parse_entirely(|i| FontPaletteBase::parse(self.context, i))?)
            },
            "override-colors" => {
                self.rule.override_colors = parse_override_colors(self.context, input)?
            },
            _ => return Err(input.new_custom_error(SelectorParseErrorKind::UnexpectedIdent(name.clone()))),
        }
        Ok(())
    }
}

impl<'a, 'i> RuleBodyItemParser<'i, (), StyleParseErrorKind<'i>>
    for FontPaletteValuesDeclarationParser<'a>
{
    fn parse_declarations(&self) -> bool {
        true
    }
    fn parse_qualified(&self) -> bool {
        false
    }
}