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ez90/slug-function.sql

Created September 10, 2018 10:06
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  1. ez90 created this gist Sep 10, 2018.
    85 changes: 85 additions & 0 deletions slug-function.sql
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    Original file line number Diff line number Diff line change
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    // Credits:
    // - http://stackoverflow.com/questions/5409831/mysql-stored-function-to-create-a-slug
    // - https://gist.github.com/jareis/847e7e1523e4ea8f8676

    DELIMITER ;;

    DROP FUNCTION IF EXISTS `slugify`;;
    CREATE FUNCTION `slugify`(dirty_string varchar(255)) RETURNS varchar(255) CHARSET utf8
    DETERMINISTIC
    BEGIN
    DECLARE x, y , z , k INT;
    DECLARE temp_string, new_string, accents, noAccents VARCHAR(255);
    DECLARE is_allowed BOOL;
    DECLARE c, check_char VARCHAR(1);

    -- IF NULL DO NOT PROCEED
    If dirty_string IS NULL Then
    return dirty_string;
    End If;

    set temp_string = LOWER(dirty_string);

    -- REPLACE ACCENTS
    -- WITH CAPS
    -- set accents = 'ŠšŽžÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÑÒÓÔÕÖØÙÚÛÜÝŸÞàáâãäåæçèéêëìíîïñòóôõöøùúûüýÿþƒ';
    -- set noAccents = 'SsZzAAAAAAACEEEEIIIINOOOOOOUUUUYYBaaaaaaaceeeeiiiinoooooouuuuyybf';
    -- ONLY SMALL CAPS
    set accents = 'šžàáâãäåæçèéêëìíîïñòóôõöøùúûüýÿþƒ';
    set noAccents = 'szaaaaaaaceeeeiiiinoooooouuuuyybf';
    set k = CHAR_LENGTH(accents);

    while k > 0 do
    set temp_string = REPLACE(temp_string, SUBSTRING(accents, k, 1), SUBSTRING(noAccents, k, 1));
    set k = k - 1;
    end while;

    -- CONVERT & TO EMPTY SPACE
    Set temp_string = REPLACE(temp_string, '&', '');

    -- REPLACE ALL UNWANTED CHARS
    Select temp_string REGEXP('[^a-z0-9\-]+') into x;
    If x = 1 then
    set z = 1;
    set k = CHAR_LENGTH(temp_string);
    While z <= k Do
    Set c = SUBSTRING(temp_string, z, 1);
    Set is_allowed = FALSE;
    If !((ascii(c) = 45) or (ascii(c) >= 48 and ascii(c) <= 57) or (ascii(c) >= 97 and ascii(c) <= 122)) Then
    Set temp_string = REPLACE(temp_string, c, '-');
    End If;
    set z = z + 1;
    End While;
    End If;

    Select temp_string REGEXP("^-|-$|'") into x;
    If x = 1 Then
    Set temp_string = Replace(temp_string, "'", '');
    Set z = CHAR_LENGTH(temp_string);
    Set y = CHAR_LENGTH(temp_string);
    Dash_check: While z > 1 Do
    If STRCMP(SUBSTRING(temp_string, -1, 1), '-') = 0 Then
    Set temp_string = SUBSTRING(temp_string,1, y-1);
    Set y = y - 1;
    Else
    Leave Dash_check;
    End If;
    Set z = z - 1;
    End While;
    End If;

    Repeat
    Select temp_string REGEXP("--") into x;
    If x = 1 Then
    Set temp_string = REPLACE(temp_string, "--", "-");
    End If;
    Until x <> 1 End Repeat;

    If LOCATE('-', temp_string) = 1 Then
    Set temp_string = SUBSTRING(temp_string, 2);
    End If;

    Return temp_string;
    END;;

    DELIMITER ;