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Replace / division with multiplication and custom divide() function (#34245)

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* Convert bulk of division to multiplication

* Use custom divide() function instead of Dart Sass math module for greater compatibility

* Apply suggestions from code review

* Fix functions
This commit is contained in:
Mark Otto
2021-06-14 09:35:30 -07:00
committed by GitHub
parent e9da490e51
commit be17444756
15 changed files with 86 additions and 58 deletions
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31
scss/_functions.scss
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@@ -95,7 +95,7 @@
// Color contrast
// See https://github.com/twbs/bootstrap/pull/30168
// A list of pre-calculated numbers of pow(($value / 255 + .055) / 1.055, 2.4). (from 0 to 255)
// A list of pre-calculated numbers of pow(divide((divide($value, 255) + .055), 1.055), 2.4). (from 0 to 255)
// stylelint-disable-next-line scss/dollar-variable-default, scss/dollar-variable-pattern
$_luminance-list: .0008 .001 .0011 .0013 .0015 .0017 .002 .0022 .0025 .0027 .003 .0033 .0037 .004 .0044 .0048 .0052 .0056 .006 .0065 .007 .0075 .008 .0086 .0091 .0097 .0103 .011 .0116 .0123 .013 .0137 .0144 .0152 .016 .0168 .0176 .0185 .0194 .0203 .0212 .0222 .0232 .0242 .0252 .0262 .0273 .0284 .0296 .0307 .0319 .0331 .0343 .0356 .0369 .0382 .0395 .0409 .0423 .0437 .0452 .0467 .0482 .0497 .0513 .0529 .0545 .0561 .0578 .0595 .0612 .063 .0648 .0666 .0685 .0704 .0723 .0742 .0762 .0782 .0802 .0823 .0844 .0865 .0887 .0908 .0931 .0953 .0976 .0999 .1022 .1046 .107 .1095 .1119 .1144 .117 .1195 .1221 .1248 .1274 .1301 .1329 .1356 .1384 .1413 .1441 .147 .15 .1529 .1559 .159 .162 .1651 .1683 .1714 .1746 .1779 .1812 .1845 .1878 .1912 .1946 .1981 .2016 .2051 .2086 .2122 .2159 .2195 .2232 .227 .2307 .2346 .2384 .2423 .2462 .2502 .2542 .2582 .2623 .2664 .2705 .2747 .2789 .2831 .2874 .2918 .2961 .3005 .305 .3095 .314 .3185 .3231 .3278 .3325 .3372 .3419 .3467 .3515 .3564 .3613 .3663 .3712 .3763 .3813 .3864 .3916 .3968 .402 .4072 .4125 .4179 .4233 .4287 .4342 .4397 .4452 .4508 .4564 .4621 .4678 .4735 .4793 .4851 .491 .4969 .5029 .5089 .5149 .521 .5271 .5333 .5395 .5457 .552 .5583 .5647 .5711 .5776 .5841 .5906 .5972 .6038 .6105 .6172 .624 .6308 .6376 .6445 .6514 .6584 .6654 .6724 .6795 .6867 .6939 .7011 .7084 .7157 .7231 .7305 .7379 .7454 .7529 .7605 .7682 .7758 .7835 .7913 .7991 .807 .8148 .8228 .8308 .8388 .8469 .855 .8632 .8714 .8796 .8879 .8963 .9047 .9131 .9216 .9301 .9387 .9473 .956 .9647 .9734 .9823 .9911 1;
@@ -123,7 +123,7 @@ $_luminance-list: .0008 .001 .0011 .0013 .0015 .0017 .002 .0022 .0025 .0027 .003
$l1: luminance($background);
$l2: luminance(opaque($background, $foreground));
@return if($l1 > $l2, ($l1 + .05) / ($l2 + .05), ($l2 + .05) / ($l1 + .05));
@return if($l1 > $l2, divide($l1 + .05, $l2 + .05), divide($l2 + .05, $l1 + .05));
}
// Return WCAG2.0 relative luminance
@@ -137,7 +137,7 @@ $_luminance-list: .0008 .001 .0011 .0013 .0015 .0017 .002 .0022 .0025 .0027 .003
);
@each $name, $value in $rgb {
$value: if($value / 255 < .03928, $value / 255 / 12.92, nth($_luminance-list, $value + 1));
$value: if(divide($value, 255) < .03928, divide(divide($value, 255), 12.92), nth($_luminance-list, $value + 1));
$rgb: map-merge($rgb, ($name: $value));
}
@@ -219,3 +219,28 @@ $_luminance-list: .0008 .001 .0011 .0013 .0015 .0017 .002 .0022 .0025 .0027 .003
@return if($return-calc == true, calc(#{$value1} - #{$value2}), $value1 + unquote(" - ") + $value2);
}
@function divide($dividend, $divisor, $precision: 10) {
$sign: if($dividend > 0 and $divisor > 0, 1, -1);
$dividend: abs($dividend);
$divisor: abs($divisor);
$quotient: 0;
$remainder: $dividend;
@if $dividend == 0 {
@return 0;
}
@if $divisor == 0 {
@error "Cannot divide by 0";
}
@if $divisor == 1 {
@return $dividend;
}
@while $remainder >= $divisor {
$quotient: $quotient + 1;
$remainder: $remainder - $divisor;
}
@if $remainder > 0 and $precision > 0 {
$remainder: divide($remainder * 10, $divisor, $precision - 1) * .1;
}
@return ($quotient + $remainder) * $sign;
}