function SearchTextProcessorTest::testSearchTextProcessorUnicode

Tests that text processing handles Unicode characters correctly.

File

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

Class

SearchTextProcessorTest

Test search text preprocessing functionality.

Namespace

Code

public function testSearchTextProcessorUnicode() : void {
    // This test uses a file that was constructed so that the even lines are
    // boundary characters, and the odd lines are valid word characters. (It
    // was generated as a sequence of all the Unicode characters, and then the
    // boundary characters (punctuation, spaces, etc.) were split off into
    // their own lines). So the even-numbered lines should simplify to nothing,
    // and the odd-numbered lines we need to split into shorter chunks and
    // verify that text processing doesn't lose any characters.
    $input = file_get_contents($this->root . '/core/modules/search/tests/UnicodeTest.txt');
    $base_strings = explode(chr(10), $input);
    $strings = [];
    $text_processor = \Drupal::service('search.text_processor');
    assert($text_processor instanceof SearchTextProcessorInterface);
    foreach ($base_strings as $key => $string) {
        if ($key % 2) {
            // Even line - should simplify down to a space.
            $simplified = $text_processor->analyze($string);
            $this->assertSame(' ', $simplified, "Line {$key} is excluded from the index");
        }
        else {
            // Odd line, should be word characters.
            // Split this into 30-character chunks, so we don't run into limits of
            // truncation in
            // \Drupal\search\SearchTextProcessorInterface::analyze().
            $start = 0;
            while ($start < mb_strlen($string)) {
                $new_string = mb_substr($string, $start, 30);
                // Special case: leading zeros are removed from numeric strings,
                // and there's one string in this file that is numbers starting with
                // zero, so prepend a 1 on that string.
                if (preg_match('/^[0-9]+$/', $new_string)) {
                    $new_string = '1' . $new_string;
                }
                $strings[] = $new_string;
                $start += 30;
            }
        }
    }
    foreach ($strings as $key => $string) {
        $simplified = $text_processor->analyze($string);
        $this->assertGreaterThanOrEqual(mb_strlen($string), mb_strlen($simplified), "Nothing is removed from string {$key}.");
    }
    // Test the low-numbered ASCII control characters separately. They are not
    // in the text file because they are problematic for diff, especially \0.
    $string = '';
    for ($i = 0; $i < 32; $i++) {
        $string .= chr($i);
    }
    $this->assertSame(' ', $text_processor->analyze($string), 'Search simplify works for ASCII control characters.');
}