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function "yml:hex2dec" {

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    param "hex";

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    param "_result", 0;

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    const "hd", "substring($hex, 1, 1)";

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    const "a", """translate($hd, 'ABCDEFabcdef123456789',

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        '123456123456000000000')""";

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    const "d" choose {

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        when "$a>0" value "$a + 9";

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        otherwise value "$hd";

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    }

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    choose {

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        when "string-length($hex) = 1"

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            value "$_result * 16 + $d";

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        otherwise call "yml:hex2dec"

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            with "hex", "substring($hex, 2, 8)", 

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            with "_result", "$_result * 16 + $d";

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    }

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}

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function "yml:dec2hex" {

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    param "dec";

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    param "bits", !16**7!;

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    const "v", "floor($dec div $bits)";

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    value "substring('0123456789abcdef', $v + 1, 1)";

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    if "$bits > 1" call "yml:dec2hex"

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        with "dec", "$dec - $bits * $v",

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        with "bits", "$bits div 16";

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}

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def "yml:dec2hex" {

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    param "dec";

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    param "digits", 8;

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    result call "yml:dec2hex" with "dec", "$dec", with "bits", "math:power(16, $digits - 1)";

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}

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def "yml:hex2dec" {

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    param "hex";

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    result call "yml:hex2dec" with "hex", "$hex";

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}

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def "yml:lcase" {

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    param "text", "''";

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    result "translate($text, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz')";

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}

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def "yml:ucase" {

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    param "text", "''";

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    result "translate($text, 'abcdefghijklmnopqrstuvwxyz', 'ABCDEFGHIJKLMNOPQRSTUVWXYZ')";

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}

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def "yml:mixedCase" {

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    param "text", "''";

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    result "concat(yml:lcase(substring($text,1,1)),substring($text,2))";

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}

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def "yml:capit" {

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    param "text", "''";

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    result "concat(yml:ucase(substring($text,1,1)),substring($text,2))";

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}

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