Function consumeStyleKey

packages/core/src/render3/styling/styling_parser.ts:209–221

(text: string, startIndex: number, endIndex: number)

 * @returns Index after last style key character.
 */
export function consumeStyleKey(text: string, startIndex: number, endIndex: number): number {
  let ch: number;
  while (
    startIndex < endIndex &&
    ((ch = text.charCodeAt(startIndex)) === CharCode.DASH ||
      ch === CharCode.UNDERSCORE ||
      ((ch & CharCode.UPPER_CASE) >= CharCode.A && (ch & CharCode.UPPER_CASE) <= CharCode.Z) ||
      (ch >= CharCode.ZERO && ch <= CharCode.NINE))
  ) {
    startIndex++;
  }
  return startIndex;
}

/**
 * Consumes all whitespace and the separator `:` after the style key.