Function parseFontFace

packages/fontaine/src/css.ts:56–124

(css: string | CssNode)

 * @returns Array<{ family?: string, source?: string }> - Array of objects with font family and source information
 */
export function parseFontFace(css: string | CssNode): Array<{ index: number, family: string, source?: string, properties: FontProperties }> {
  const families: Array<{ index: number, family: string, source?: string, properties: FontProperties }> = []
  const ast = typeof css === 'string' ? parse(css, { positions: true }) : css

  walk(ast, {
    visit: 'Atrule',
    enter(node) {
      if (node.name !== 'font-face')
        return

      let family: string | undefined
      const sources: string[] = []
      const properties: FontProperties = {}

      if (node.block) {
        walk(node.block, {
          visit: 'Declaration',
          enter(declaration) {
            if (declaration.property === 'font-family' && declaration.value.type === 'Value') {
              for (const child of declaration.value.children) {
                if (child.type === 'String') {
                  family = withoutQuotes(child.value)
                  break
                }
                if (child.type === 'Identifier' && !genericCSSFamilies.has(child.name)) {
                  family = child.name
                  break
                }
              }
            }

            if (fontProperties.has(declaration.property)) {
              if (declaration.value.type === 'Value') {
                for (const child of declaration.value.children) {
                  const hasValue = !!properties[declaration.property as keyof FontProperties]
                  properties[declaration.property as keyof FontProperties] ||= ''
                  properties[declaration.property as keyof FontProperties] += (hasValue ? ' ' : '') + generate(child)
                }
              }
            }

            if (declaration.property === 'src') {
              walk(declaration.value, {
                visit: 'Url',
                enter(urlNode) {
                  const source = withoutQuotes(urlNode.value)
                  if (source) {
                    sources.push(source)
                  }
                },
              })
            }
          },
        })
      }

      if (family) {
        for (const source of sources) {