takumi 0.73.0

Render your React components to images.
Documentation 
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use cssparser::{Parser, Token};
use parley::FontFeature;
use swash::tag_from_str_lossy;

use crate::layout::style::{CssToken, FromCss, MakeComputed, ParseResult};

/// Controls OpenType font features via CSS font-feature-settings property.
///
/// This allows enabling/disabling specific typographic features in OpenType fonts
/// such as ligatures, kerning, small caps, and other advanced typography features.
pub type FontFeatureSettings = Box<[FontFeature]>;

impl MakeComputed for FontFeatureSettings {}

impl<'i> FromCss<'i> for FontFeatureSettings {
  fn from_css(input: &mut Parser<'i, '_>) -> ParseResult<'i, Self> {
    if input
      .try_parse(|input| input.expect_ident_matching("normal"))
      .is_ok()
    {
      return Ok(Box::new([]));
    }

    let list = input.parse_comma_separated(|input| {
      let location = input.current_source_location();
      let tag_name = input.expect_string()?;
      if tag_name.len() != 4 || !tag_name.is_ascii() {
        return Err(Self::unexpected_token_error(
          location,
          &Token::QuotedString(tag_name.clone()),
        ));
      }

      let tag = tag_from_str_lossy(tag_name);
      let value = if input.is_exhausted() {
        1
      } else {
        let location = input.current_source_location();
        match input.next()? {
          Token::Ident(st) if st.as_ref() == "on" => 1,
          Token::Ident(st) if st.as_ref() == "off" => 0,
          Token::Number {
            value, int_value, ..
          } => int_value.map(|v| v as u16).unwrap_or(*value as u16),
          token => {
            return Err(Self::unexpected_token_error(location, token));
          }
        }
      };

      Ok(FontFeature { tag, value })
    })?;

    Ok(list.into_boxed_slice())
  }

  fn valid_tokens() -> &'static [CssToken] {
    &[CssToken::Keyword("normal"), CssToken::Token("string")]
  }
}