Function applyQuantifier

src/pkg/utils/regex_to_glob.ts:683–741

(unit: Unit | null)

  // ----- Quantifiers ----- 数量词应用
  function applyQuantifier(unit: Unit | null): string | null {
    if (unit === null) return null;

    // '*' / '*?' / '*+' —— 任意长度
    if (peek() === "*") {
      next();
      eatQuantMod();
      return "*";
    }

    // '+' / '+?' / '++' —— 至少一次：base + '*'
    if (peek() === "+") {
      next();
      eatQuantMod();
      return (unit.baseGlob || unit.glob) + "*";
    }

    // '?' / '??' / '?+' —— 可选：统一为 '*'
    if (peek() === "?") {
      next();
      eatQuantMod();
      return "*";
    }

    // '{m}', '{m,}', '{m,n}'（懒惰/占有修饰同样处理）
    if (peek() === "{") {
      const save = i;
      next();
      let num = "";
      while (/[0-9]/.test(peek())) num += next();
      if (num === "" || (peek() !== "}" && peek() !== ",")) {
        i = save;
        return unit.glob; // 回退为单元字面
      }
      const m = parseInt(num, 10);
      const baseForRepeat = unit.isLiteral ? unit.glob : unit.baseGlob || unit.glob;

      if (eatIf("}")) {
        eatQuantMod();
        return baseForRepeat.repeat(m);
      }
      if (eatIf(",")) {
        let num2 = "";
        while (/[0-9]/.test(peek())) num2 += next();
        if (!eatIf("}")) {
          i = save;
          return unit.glob;
        }
        const core = baseForRepeat.repeat(m);
        eatQuantMod();
        if (num2 === "") return core + "*"; // {m,}
        const nmax = parseInt(num2, 10);
        return core + (Number.isNaN(nmax) || nmax > m ? "*" : ""); // {m,n}
      }
    }

    // 无数量词：返回单元 glob
    return unit.glob;