function SearchTokenizerTest::testTokenizer

Verifies that strings of CJK characters are tokenized.

The search_simplify() function does special things with numbers, symbols, and punctuation. So we only test that CJK characters that are not in these character classes are tokenized properly. See PREG_CLASS_CKJ for more information.

File

core/modules/search/tests/src/Kernel/SearchTokenizerTest.php, line 27

Class

SearchTokenizerTest

Tests that CJK tokenizer works as intended.

Namespace

Code

public function testTokenizer() {
    // Set the minimum word size to 1 (to split all CJK characters) and make
    // sure CJK tokenizing is turned on.
    $this->config('search.settings')
        ->set('index.minimum_word_size', 1)
        ->set('index.overlap_cjk', TRUE)
        ->save();
    // Create a string of CJK characters from various character ranges in
    // the Unicode tables.
    // Beginnings of the character ranges.
    $starts = [
        'CJK unified' => 0x4e00,
        'CJK Ext A' => 0x3400,
        'CJK Compat' => 0xf900,
        'Hangul Jamo' => 0x1100,
        'Hangul Ext A' => 0xa960,
        'Hangul Ext B' => 0xd7b0,
        'Hangul Compat' => 0x3131,
        'Half non-punct 1' => 0xff21,
        'Half non-punct 2' => 0xff41,
        'Half non-punct 3' => 0xff66,
        'Hangul Syllables' => 0xac00,
        'Hiragana' => 0x3040,
        'Katakana' => 0x30a1,
        'Katakana Ext' => 0x31f0,
        'CJK Reserve 1' => 0x20000,
        'CJK Reserve 2' => 0x30000,
        'Bomofo' => 0x3100,
        'Bomofo Ext' => 0x31a0,
        'Lisu' => 0xa4d0,
        'Yi' => 0xa000,
    ];
    // Ends of the character ranges.
    $ends = [
        'CJK unified' => 0x9fcf,
        'CJK Ext A' => 0x4dbf,
        'CJK Compat' => 0xfaff,
        'Hangul Jamo' => 0x11ff,
        'Hangul Ext A' => 0xa97f,
        'Hangul Ext B' => 0xd7ff,
        'Hangul Compat' => 0x318e,
        'Half non-punct 1' => 0xff3a,
        'Half non-punct 2' => 0xff5a,
        'Half non-punct 3' => 0xffdc,
        'Hangul Syllables' => 0xd7af,
        'Hiragana' => 0x309f,
        'Katakana' => 0x30ff,
        'Katakana Ext' => 0x31ff,
        'CJK Reserve 1' => 0x2fffd,
        'CJK Reserve 2' => 0x3fffd,
        'Bomofo' => 0x312f,
        'Bomofo Ext' => 0x31b7,
        'Lisu' => 0xa4fd,
        'Yi' => 0xa48f,
    ];
    // Generate characters consisting of starts, midpoints, and ends.
    $chars = [];
    $charcodes = [];
    foreach ($starts as $key => $value) {
        $charcodes[] = $starts[$key];
        $chars[] = $this->code2utf($starts[$key]);
        $mid = round(0.5 * ($starts[$key] + $ends[$key]));
        $charcodes[] = $mid;
        $chars[] = $this->code2utf($mid);
        $charcodes[] = $ends[$key];
        $chars[] = $this->code2utf($ends[$key]);
    }
    // Merge into a string and tokenize.
    $string = implode('', $chars);
    $out = trim(search_simplify($string));
    $expected = mb_strtolower(implode(' ', $chars));
    // Verify that the output matches what we expect.
    $this->assertEqual($out, $expected, 'CJK tokenizer worked on all supplied CJK characters');
}