Function analyzeSimpleSequence

src/pkg/utils/regex_to_glob.ts:332–402

(s: string)

    varLen: boolean;
  }
  function analyzeSimpleSequence(s: string): SequenceAnalysis | null {
    let idx = 0,
      minTotal = 0,
      variable = false;
    while (idx < s.length) {
      let unitMin = 0,
        unitVar = false;
      const ch = s[idx];
      if (ch === "(") return null;
      if (ch === "\\") {
        idx++;
        if (idx >= s.length) return null;
        const esc = s[idx++];
        if (esc === "b" || esc === "B") {
          unitMin = 0;
        } else if ("wdsWDS".includes(esc)) {
          unitMin = 1;
        } else {
          unitMin = 1;
        }
      } else if (ch === ".") {
        idx++;
        unitMin = 1;
      } else if (ch === "[") {
        const ni = parseClassInString(s, idx);
        if (ni < 0) return null;
        idx = ni;
        unitMin = 1;
      } else if (REGEX_SPECIAL.has(ch)) {
        return null;
      } else {
        idx++;
        unitMin = 1;
      }

      if (idx < s.length) {
        const q = s[idx];
        if (q === "*") {
          idx++;
          eatQuantMod();
          unitMin = 0;
          unitVar = true;
        } else if (q === "+") {
          idx++;
          eatQuantMod();
          unitMin = Math.max(1, unitMin);
          unitVar = true;
        } else if (q === "?") {
          idx++;
          eatQuantMod();
          unitMin = 0;
          unitVar = true;
        } else if (q === "{") {
          const br = parseBracesQuant(s, idx);
          if (!br.ok) return null;
          idx = br.next;
          if (br.type === "exact") unitMin = unitMin * (br.m || 0);
          else if (br.type === "open") {