function SearchTokenizerTestCase::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

modules/search/tests/search.test, line 1693

Tests for search.module.

Class

SearchTokenizerTestCase

Test the CJK tokenizer.

Code

function testTokenizer() {
  // Set the minimum word size to 1 (to split all CJK characters) and make
  // sure CJK tokenizing is turned on.
  config('search.settings')
    ->set('search_minimum_word_size', 1)
    ->set('search_overlap_cjk', TRUE)
    ->save();
  $this->refreshVariables();

  // Create a string of CJK characters from various character ranges in
  // the Unicode tables.

  // Beginnings of the character ranges.
  $starts = array(
    '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 = array(
    '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 = array();
  $charcodes = array();
  foreach ($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 = backdrop_strtolower(implode(' ', $chars));

  // Verify that the output matches what we expect.
  $this->assertEqual($out, $expected, 'CJK tokenizer worked on all supplied CJK characters');
}