private static Pattern makePatternFromWildcard()

in base/src/com/google/idea/blaze/base/lang/buildfile/globbing/UnixGlob.java [160:205]

• 41 lines of code
• 21 McCabe index (conditional complexity)

  private static Pattern makePatternFromWildcard(String pattern) {
    StringBuilder regexp = new StringBuilder();
    for (int i = 0, len = pattern.length(); i < len; i++) {
      char c = pattern.charAt(i);
      switch (c) {
        case '*':
          int toIncrement = 0;
          if (len > i + 1 && pattern.charAt(i + 1) == '*') {
            // The pattern '**' is interpreted to match 0 or more directory separators, not 1 or
            // more. We skip the next * and then find a trailing/leading '/' and get rid of it.
            toIncrement = 1;
            if (len > i + 2 && pattern.charAt(i + 2) == '/') {
              // We have '**/' -- skip the '/'.
              toIncrement = 2;
            } else if (len == i + 2 && i > 0 && pattern.charAt(i - 1) == '/') {
              // We have '/**' -- remove the '/'.
              regexp.delete(regexp.length() - 1, regexp.length());
            }
          }
          regexp.append(".*");
          i += toIncrement;
          break;
        case '?':
          regexp.append('.');
          break;
          // escape the regexp special characters that are allowed in wildcards
        case '^':
        case '$':
        case '|':
        case '+':
        case '{':
        case '}':
        case '[':
        case ']':
        case '\\':
        case '.':
          regexp.append('\\');
          regexp.append(c);
          break;
        default:
          regexp.append(c);
          break;
      }
    }
    return Pattern.compile(regexp.toString());
  }