expressionToFontFeatureSettings static method

Implementation

static List<FontFeature> expressionToFontFeatureSettings(
    List<css.Expression> value) {
  List<FontFeature> fontFeatures = [];
  for (int i = 0; i < value.length; i++) {
    css.Expression exp = value[i];
    if (exp is css.LiteralTerm) {
      if (exp.text != "on" &&
          exp.text != "off" &&
          exp.text != "1" &&
          exp.text != "0") {
        if (i < value.length - 1) {
          css.Expression nextExp = value[i + 1];
          if (nextExp is css.LiteralTerm &&
              (nextExp.text == "on" ||
                  nextExp.text == "off" ||
                  nextExp.text == "1" ||
                  nextExp.text == "0")) {
            fontFeatures.add(FontFeature(exp.text,
                nextExp.text == "on" || nextExp.text == "1" ? 1 : 0));
          } else {
            fontFeatures.add(FontFeature.enable(exp.text));
          }
        } else {
          fontFeatures.add(FontFeature.enable(exp.text));
        }
      }
    }
  }
  List<FontFeature> finalFontFeatures = fontFeatures.toSet().toList();
  return finalFontFeatures;
}