private static String checkPatternForError()

in base/src/com/google/idea/blaze/base/lang/buildfile/validation/GlobPatternValidator.java [40:73]

• 34 lines of code
• 16 McCabe index (conditional complexity)

  private static String checkPatternForError(String pattern) {
    if (pattern.isEmpty()) {
      return "pattern cannot be empty";
    }
    if (pattern.charAt(0) == '/') {
      return "pattern cannot be absolute";
    }
    for (int i = 0; i < pattern.length(); i++) {
      char c = pattern.charAt(i);
      switch (c) {
        case '(':
        case ')':
        case '{':
        case '}':
        case '[':
        case ']':
          return "illegal character '" + c + "'";
        default: // fall out
      }
    }
    Iterable<String> segments = Splitter.on('/').split(pattern);
    for (String segment : segments) {
      if (segment.isEmpty()) {
        return "empty segment not permitted";
      }
      if (segment.equals(".") || segment.equals("..")) {
        return "segment '" + segment + "' not permitted";
      }
      if (segment.contains("**") && !segment.equals("**")) {
        return "recursive wildcard must be its own segment";
      }
    }
    return null;
  }