interface SearchTextProcessorInterface

interface SearchTextProcessorInterface {
    
    /**
     * Matches all 'N' Unicode character classes (numbers)
     */
    const PREG_CLASS_NUMBERS = '\\x{30}-\\x{39}\\x{b2}\\x{b3}\\x{b9}\\x{bc}-\\x{be}\\x{660}-\\x{669}\\x{6f0}-\\x{6f9}' . '\\x{966}-\\x{96f}\\x{9e6}-\\x{9ef}\\x{9f4}-\\x{9f9}\\x{a66}-\\x{a6f}\\x{ae6}-\\x{aef}' . '\\x{b66}-\\x{b6f}\\x{be7}-\\x{bf2}\\x{c66}-\\x{c6f}\\x{ce6}-\\x{cef}\\x{d66}-\\x{d6f}' . '\\x{e50}-\\x{e59}\\x{ed0}-\\x{ed9}\\x{f20}-\\x{f33}\\x{1040}-\\x{1049}\\x{1369}-' . '\\x{137c}\\x{16ee}-\\x{16f0}\\x{17e0}-\\x{17e9}\\x{17f0}-\\x{17f9}\\x{1810}-\\x{1819}' . '\\x{1946}-\\x{194f}\\x{2070}\\x{2074}-\\x{2079}\\x{2080}-\\x{2089}\\x{2153}-\\x{2183}' . '\\x{2460}-\\x{249b}\\x{24ea}-\\x{24ff}\\x{2776}-\\x{2793}\\x{3007}\\x{3021}-\\x{3029}' . '\\x{3038}-\\x{303a}\\x{3192}-\\x{3195}\\x{3220}-\\x{3229}\\x{3251}-\\x{325f}\\x{3280}-' . '\\x{3289}\\x{32b1}-\\x{32bf}\\x{ff10}-\\x{ff19}';
    
    /**
     * Matches all 'P' Unicode character classes (punctuation)
     */
    const PREG_CLASS_PUNCTUATION = '\\x{21}-\\x{23}\\x{25}-\\x{2a}\\x{2c}-\\x{2f}\\x{3a}\\x{3b}\\x{3f}\\x{40}\\x{5b}-\\x{5d}' . '\\x{5f}\\x{7b}\\x{7d}\\x{a1}\\x{ab}\\x{b7}\\x{bb}\\x{bf}\\x{37e}\\x{387}\\x{55a}-\\x{55f}' . '\\x{589}\\x{58a}\\x{5be}\\x{5c0}\\x{5c3}\\x{5f3}\\x{5f4}\\x{60c}\\x{60d}\\x{61b}\\x{61f}' . '\\x{66a}-\\x{66d}\\x{6d4}\\x{700}-\\x{70d}\\x{964}\\x{965}\\x{970}\\x{df4}\\x{e4f}' . '\\x{e5a}\\x{e5b}\\x{f04}-\\x{f12}\\x{f3a}-\\x{f3d}\\x{f85}\\x{104a}-\\x{104f}\\x{10fb}' . '\\x{1361}-\\x{1368}\\x{166d}\\x{166e}\\x{169b}\\x{169c}\\x{16eb}-\\x{16ed}\\x{1735}' . '\\x{1736}\\x{17d4}-\\x{17d6}\\x{17d8}-\\x{17da}\\x{1800}-\\x{180a}\\x{1944}\\x{1945}' . '\\x{2010}-\\x{2027}\\x{2030}-\\x{2043}\\x{2045}-\\x{2051}\\x{2053}\\x{2054}\\x{2057}' . '\\x{207d}\\x{207e}\\x{208d}\\x{208e}\\x{2329}\\x{232a}\\x{23b4}-\\x{23b6}\\x{2768}-' . '\\x{2775}\\x{27e6}-\\x{27eb}\\x{2983}-\\x{2998}\\x{29d8}-\\x{29db}\\x{29fc}\\x{29fd}' . '\\x{3001}-\\x{3003}\\x{3008}-\\x{3011}\\x{3014}-\\x{301f}\\x{3030}\\x{303d}\\x{30a0}' . '\\x{30fb}\\x{fd3e}\\x{fd3f}\\x{fe30}-\\x{fe52}\\x{fe54}-\\x{fe61}\\x{fe63}\\x{fe68}' . '\\x{fe6a}\\x{fe6b}\\x{ff01}-\\x{ff03}\\x{ff05}-\\x{ff0a}\\x{ff0c}-\\x{ff0f}\\x{ff1a}' . '\\x{ff1b}\\x{ff1f}\\x{ff20}\\x{ff3b}-\\x{ff3d}\\x{ff3f}\\x{ff5b}\\x{ff5d}\\x{ff5f}-' . '\\x{ff65}';
    
    /**
     * Matches CJK (Chinese, Japanese, Korean) letter-like characters.
     *
     * This list is derived from the "East Asian Scripts" section of
     * http://www.unicode.org/charts/index.html, as well as a comment on
     * http://unicode.org/reports/tr11/tr11-11.html listing some character
     * ranges that are reserved for additional CJK ideographs.
     *
     * The character ranges do not include numbers, punctuation, or symbols, since
     * these are handled separately in search. Note that radicals and strokes are
     * considered symbols. (See
     * http://www.unicode.org/Public/UNIDATA/extracted/DerivedGeneralCategory.txt)
     *
     * @see \Drupal\search\SearchTextProcessor::expandCjk()
     */
    const PREG_CLASS_CJK = '\\x{1100}-\\x{11FF}\\x{3040}-\\x{309F}\\x{30A1}-\\x{318E}' . '\\x{31A0}-\\x{31B7}\\x{31F0}-\\x{31FF}\\x{3400}-\\x{4DBF}\\x{4E00}-\\x{9FCF}' . '\\x{A000}-\\x{A48F}\\x{A4D0}-\\x{A4FD}\\x{A960}-\\x{A97F}\\x{AC00}-\\x{D7FF}' . '\\x{F900}-\\x{FAFF}\\x{FF21}-\\x{FF3A}\\x{FF41}-\\x{FF5A}\\x{FF66}-\\x{FFDC}' . '\\x{20000}-\\x{2FFFD}\\x{30000}-\\x{3FFFD}';
    
    /**
     * Processes text into words for indexing.
     *
     * @param string $text
     *   Text to process.
     * @param string|null $langcode
     *   Language code for the language of $text, if known.
     *
     * @return array
     *   Array of words in the simplified, preprocessed text.
     *
     * @see \Drupal\search\SearchTextProcessorInterface::analyze()
     */
    public function process(string $text, ?string $langcode = NULL) : array;
    
    /**
     * Runs the text through character analyzers in preparation for indexing.
     *
     * Processing steps:
     * - Entities are decoded.
     * - Text is lower-cased and diacritics (accents) are removed.
     * - hook_search_preprocess() is invoked.
     * - CJK (Chinese, Japanese, Korean) characters are processed, depending on
     *   the search settings.
     * - Punctuation is processed (removed or replaced with spaces, depending on
     *   where it is; see code for details).
     * - Words are truncated to 50 characters maximum.
     *
     * @param string $text
     *   Text to simplify.
     * @param string|null $langcode
     *   (optional) Language code for the language of $text, if known.
     *
     * @return string
     *   Simplified and processed text.
     *
     * @see hook_search_preprocess()
     */
    public function analyze(string $text, ?string $langcode = NULL) : string;

}