protected String convertToRE()

in src/org/jetbrains/r/visualization/inlays/table/filters/parser/Parser.java [481:549]

• 64 lines of code
• 15 McCabe index (conditional complexity)

    protected String convertToRE(String s) {
      StringBuilder sb = new StringBuilder();
      boolean escaped = false;
      instantApplied = 0;

      for (char c : s.toCharArray()) {

        if (c == '*') {
          if (escaped) {
            sb.append("\\*");
            escaped = false;
          }
          else {
            sb.append(".*");
          }
        }
        else if (c == '?') {
          if (escaped) {
            sb.append("\\?");
            escaped = false;
          }
          else {
            sb.append(".");
          }
        }
        else if (c == '\\') {
          if (escaped) {
            sb.append("\\\\\\\\");
          }
          escaped = !escaped;
        }
        else {
          if (escaped) {
            sb.append("\\\\");
            escaped = false;
          }
          switch (c) {
            case '[', ']', '^', '$', '+', '{', '}', '|', '(', ')', '.' -> sb.append('\\').append(c);
            default -> sb.append(c);
          }
        }
      }

      if (escaped) {
        sb.append("\\\\");
      }

      if (instantMode) {
        int l = sb.length();
        boolean okStart, okEnd;
        if (l < 2) {
          okStart = okEnd = false;
        }
        else {
          okStart = sb.substring(0, 2).equals(".*");
          okEnd = sb.substring(l - 2).equals(".*");
        }
        if (!okStart) {
          instantApplied = 1;
          sb.insert(0, ".*");
        }
        if (!okEnd) {
          instantApplied += 2;
          sb.append(".*");
        }
      }

      return sb.toString();
    }