fun lexRegex()

in src/main/kotlin/com/intellij/ideolog/lex/LogFileLexer.kt [76:113]
30 lines of code
13 McCabe index (conditional complexity)

    fun lexRegex(event: CharSequence, output: MutableList<LogToken>, onlyValues: Boolean, parser: RegexLogParser) {
      val endOfLineIndex = if (event.length > MAX_PARSING_LENGTH) MAX_PARSING_LENGTH else event.indexOf('\n')
      val eventIsMultiline = endOfLineIndex != -1
      val dataToMatch = if (!eventIsMultiline) event else event.subSequence(0, endOfLineIndex)

      val matcher = parser.regex.matcher(dataToMatch)
      if (!matcher.find() || matcher.groupCount() == 0) {
        output.add(LogToken(0, event.length, false))
        return
      }

      var lastGroupEnd = 0
      for(i in 1 .. matcher.groupCount()) {
        val start = matcher.start(i)
        if (start < lastGroupEnd) continue

        val end = matcher.end(i)

        if(end < 0)
          continue

        if(start > lastGroupEnd) {
          if(!onlyValues)
            output.add(LogToken(lastGroupEnd, start, true))
        }

        output.add(LogToken(start, end, false))

        lastGroupEnd = end
      }

      if (eventIsMultiline) {
        val lastToken = output.removeAt(output.lastIndex)
        output.add(LogToken(lastToken.startOffset, event.length, false))
      } else if(lastGroupEnd < matcher.end() && !onlyValues) {
        output.add(LogToken(lastGroupEnd, matcher.end(), true))
      }
    }