Function lightFormat

pkgs/core/src/lightFormat/index.ts:87–132

(
  date: DateArg<Date> & {},
  formatStr: string,
)

 * //=> '2014-02-11'
 */
export function lightFormat(
  date: DateArg<Date> & {},
  formatStr: string,
): string {
  const date_ = toDate(date);

  if (!isValid(date_)) {
    throw new RangeError("Invalid time value");
  }

  const tokens = formatStr.match(formattingTokensRegExp);

  // The only case when formattingTokensRegExp doesn't match the string is when it's empty
  if (!tokens) return "";

  const result = tokens
    .map((substring) => {
      // Replace two single quote characters with one single quote character
      if (substring === "''") {
        return "'";
      }

      const firstCharacter = substring[0];
      if (firstCharacter === "'") {
        return cleanEscapedString(substring);
      }

      const formatter = lightFormatters[firstCharacter as Token];
      if (formatter) {
        return formatter(date_, substring);
      }

      if (firstCharacter.match(unescapedLatinCharacterRegExp)) {
        throw new RangeError(
          "Format string contains an unescaped latin alphabet character `" +
            firstCharacter +
            "`",
        );
      }

      return substring;
    })
    .join("");

  return result;
}

function cleanEscapedString(input: string) {
  const matches = input.match(escapedStringRegExp);