lewp_css/domain/at_rules/font_face/
font_feature_setting.rs

1// This file is part of css. It is subject to the license terms in the COPYRIGHT file found in the top-level directory of this distribution and at https://raw.githubusercontent.com/lemonrock/css/master/COPYRIGHT. No part of predicator, including this file, may be copied, modified, propagated, or distributed except according to the terms contained in the COPYRIGHT file.
2// Copyright © 2017 The developers of css. See the COPYRIGHT file in the top-level directory of this distribution and at https://raw.githubusercontent.com/lemonrock/css/master/COPYRIGHT.
3
4use {
5    crate::CustomParseError,
6    cssparser::{ParseError, Parser},
7};
8
9#[derive(Debug, Clone, Ord, PartialOrd, Eq, PartialEq, Hash)]
10pub struct FontFeatureSetting(pub String, pub u32);
11
12impl FontFeatureSetting {
13    pub(crate) fn parse<'i, 't>(
14        input: &mut Parser<'i, 't>,
15    ) -> Result<Self, ParseError<'i, CustomParseError<'i>>> {
16        let openTypeFeatureTag = {
17            let openTypeFeatureTag = input.expect_string()?;
18            if openTypeFeatureTag.len() != 4 {
19                return Err(ParseError::from(
20                    CustomParseError::FontFeatureSettingOpenTypeFeatureTagMustBeFourCharacters(
21                        openTypeFeatureTag.clone(),
22                    ),
23                ));
24            }
25
26            for character in openTypeFeatureTag.chars() {
27                if character <= '\x20' || character > '\x7E' {
28                    return Err(ParseError::from(
29                        CustomParseError::FontFeatureSettingOpenTypeFeatureTagMustBePrintableAscii(
30                            openTypeFeatureTag.clone(),
31                        ),
32                    ));
33                }
34            }
35
36            openTypeFeatureTag.as_ref().into()
37        };
38
39        if let Ok(integer) = input.r#try(|input| input.expect_integer()) {
40            if integer < 0 {
41                Err(ParseError::from(
42                    CustomParseError::FontFeatureSettingIntegerMustBePositive(
43                        integer,
44                    ),
45                ))
46            } else {
47                Ok(FontFeatureSetting(openTypeFeatureTag, integer as u32))
48            }
49        } else {
50            let ident = input.expect_ident()?;
51
52            match_ignore_ascii_case! {
53                ident,
54
55                "on" => Ok(FontFeatureSetting(openTypeFeatureTag, 1)),
56
57                "off" => Ok(FontFeatureSetting(openTypeFeatureTag, 0)),
58
59                _ => Err(ParseError::from(CustomParseError::FontFeatureSettingIfNotAnIntegerMustBeOnOrOff(ident.clone())))
60            }
61        }
62    }
63}
lewp_css/domain/at_rules/font_face/font_feature_setting.rs

lewp_css/domain/at_rules/font_face/
font_feature_setting.rs
