parseFontifyConfig function API Usage

Implementation

FontifyConfig parseFontifyConfig(String yamlSource) {
  final dynamic root = loadYaml(yamlSource);

  if (root is! YamlMap) {
    throw const FontifyException('Config root must be a YAML map.');
  }

  final dynamic section = root['fontify_plus'];

  if (section is! YamlMap) {
    throw const FontifyException("Config must contain a 'fontify_plus' map.");
  }

  if (section.containsKey('input_svg_dir') ||
      section.containsKey('output_font_file')) {
    throw const FontifyException(kLegacyConfigMessage);
  }

  final dynamic fontsYaml = section['fonts'];
  if (fontsYaml is! YamlMap || fontsYaml.isEmpty) {
    throw const FontifyException(
      'fontify_plus.fonts must be a non-empty map of named font sets.',
    );
  }

  JobValues defaults = {};
  final dynamic defaultsYaml = section['defaults'];
  if (defaultsYaml != null) {
    if (defaultsYaml is! YamlMap) {
      throw const FontifyException('fontify_plus.defaults must be a map.');
    }
    defaults = jobValuesFromYamlMap(
      defaultsYaml,
      allowedFields: kJobDefaultsFields,
      context: 'defaults',
    );
  }

  final fonts = <String, JobValues>{};
  for (final e in fontsYaml.entries) {
    final name = e.key;
    final fontYaml = e.value;
    if (name is! String) {
      throw const FontifyException('fontify_plus.fonts keys must be strings.');
    }
    if (fontYaml is! YamlMap) {
      throw FontifyException('fontify_plus.fonts.$name must be a map.');
    }
    fonts[name] = jobValuesFromYamlMap(
      fontYaml,
      allowedFields: JobField.values.toSet(),
      context: 'fonts.$name',
    );
  }

  return FontifyConfig(defaults: defaults, fonts: fonts);
}