HtmlDiff::ConvertHtmlToListOfWords PHP Метод

    private function ConvertHtmlToListOfWords($characterString)
    {
        $mode = 'character';
        $current_word = '';
        $words = array();
        foreach ($characterString as $character) {
            switch ($mode) {
                case 'character':
                    if ($this->IsStartOfTag($character)) {
                        if ($current_word != '') {
                            $words[] = $current_word;
                        }
                        $current_word = "<";
                        $mode = 'tag';
                    } else {
                        if (preg_match("[^\\s]", $character) > 0) {
                            if ($current_word != '') {
                                $words[] = $current_word;
                            }
                            $current_word = $character;
                            $mode = 'whitespace';
                        } else {
                            if ($this->IsAlphaNum($character) && (strlen($current_word) == 0 || $this->IsAlphaNum($current_word))) {
                                $current_word .= $character;
                            } else {
                                $words[] = $current_word;
                                $current_word = $character;
                            }
                        }
                    }
                    break;
                case 'tag':
                    if ($this->IsEndOfTag($character)) {
                        $current_word .= ">";
                        $words[] = $current_word;
                        $current_word = "";
                        if (!preg_match('[^\\s]', $character)) {
                            $mode = 'whitespace';
                        } else {
                            $mode = 'character';
                        }
                    } else {
                        $current_word .= $character;
                    }
                    break;
                case 'whitespace':
                    if ($this->IsStartOfTag($character)) {
                        if ($current_word != '') {
                            $words[] = $current_word;
                        }
                        $current_word = "<";
                        $mode = 'tag';
                    } else {
                        if (preg_match("[^\\s]", $character)) {
                            $current_word .= $character;
                        } else {
                            if ($current_word != '') {
                                $words[] = $current_word;
                            }
                            $current_word = $character;
                            $mode = 'character';
                        }
                    }
                    break;
                default:
                    break;
            }
        }
        if ($current_word != '') {
            $words[] = $current_word;
        }
        return $words;
    }