override fun findBlockTagRange()

in vim-engine/src/main/kotlin/com/maddyhome/idea/vim/api/VimSearchHelperBase.kt [1794:1867]
63 lines of code
19 McCabe index (conditional complexity)

  override fun findBlockTagRange(
    editor: VimEditor,
    caret: ImmutableVimCaret,
    count: Int,
    isOuter: Boolean,
  ): TextRange? {
    var counter = count
    var isOuterVariable = isOuter
    val position: Int = caret.offset
    val sequence: CharSequence = editor.text()

    val selectionStart: Int = caret.selectionStart
    val selectionEnd: Int = caret.selectionEnd

    val isRangeSelection = selectionEnd - selectionStart > 1

    var searchStartPosition: Int
    searchStartPosition = if (!isRangeSelection) {
      val line: Int = caret.getBufferPosition().line
      val lineBegin: Int = editor.getLineStartOffset(line)
      ignoreWhitespaceAtLineStart(sequence, lineBegin, position)
    } else {
      selectionEnd
    }

    if (isInHTMLTag(sequence, searchStartPosition, false)) {
      // caret is inside opening tag. Move to closing '>'.
      while (searchStartPosition < sequence.length && sequence[searchStartPosition] != '>') {
        searchStartPosition++
      }
    } else if (isInHTMLTag(sequence, searchStartPosition, true)) {
      // caret is inside closing tag. Move to starting '<'.
      while (searchStartPosition > 0 && sequence[searchStartPosition] != '<') {
        searchStartPosition--
      }
    }

    while (true) {
      val (closingTagTextRange, tagName) = findUnmatchedClosingTag(sequence, searchStartPosition, counter)
        ?: return null
      val openingTag = findUnmatchedOpeningTag(sequence, closingTagTextRange.startOffset, tagName)
        ?: return null
      if (isRangeSelection && openingTag.endOffset - 1 >= selectionStart) {
        // If there was already some text selected and the new selection would not extend further, we try again
        searchStartPosition = closingTagTextRange.endOffset
        counter = 1
        continue
      }
      var selectionEndWithoutNewline = selectionEnd
      while (selectionEndWithoutNewline < sequence.length && sequence[selectionEndWithoutNewline] == '\n') {
        selectionEndWithoutNewline++
      }
      val mode = editor.mode
      if (mode is Mode.VISUAL) {
        if (closingTagTextRange.startOffset == selectionEndWithoutNewline &&
          openingTag.endOffset == selectionStart
        ) {
          // Special case: if the inner tag is already selected we should like isOuter is active
          // Note that we need to ignore newlines, because their selection is lost between multiple "it" invocations
          isOuterVariable = true
        } else if (openingTag.endOffset == closingTagTextRange.startOffset &&
          selectionStart == openingTag.endOffset
        ) {
          // Special case: for an empty tag pair (e.g. <a></a>) the whole tag is selected if the caret is in the middle.
          isOuterVariable = true
        }
      }
      return if (isOuterVariable) {
        TextRange(openingTag.startOffset, closingTagTextRange.endOffset)
      } else {
        TextRange(openingTag.endOffset, closingTagTextRange.startOffset)
      }
    }
  }