woocommerce/plugins/woocommerce-blocks/assets/js/base/components/price-slider/constrain-range-slider-valu...

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/**
* Validate a min and max value for a range slider against defined constraints (min, max, step).
*
* @return {[number, number]} Validated and updated min/max values that fit within the range slider constraints.
*/
export const constrainRangeSliderValues = (
/**
* Tuple containing min and max values.
*/
values: [ number, number ],
/**
* Min allowed value for the sliders.
*/
min?: number | null,
/**
* Max allowed value for the sliders.
*/
max?: number | null,
/**
* Step value for the sliders.
*/
step = 1,
/**
* Whether we're currently interacting with the min range slider or not, so we update the correct values.
*/
isMin = false
): [ number, number ] => {
let [ minValue, maxValue ] = values;
const isFinite = ( n: number | undefined ): n is number =>
Number.isFinite( n );
if ( ! isFinite( minValue ) ) {
minValue = min || 0;
}
if ( ! isFinite( maxValue ) ) {
maxValue = max || step;
}
if ( isFinite( min ) && min > minValue ) {
minValue = min;
}
if ( isFinite( max ) && max <= minValue ) {
minValue = max - step;
}
if ( isFinite( min ) && min >= maxValue ) {
maxValue = min + step;
}
if ( isFinite( max ) && max < maxValue ) {
maxValue = max;
}
if ( ! isMin && minValue >= maxValue ) {
minValue = maxValue - step;
}
if ( isMin && maxValue <= minValue ) {
maxValue = minValue + step;
}
return [ minValue, maxValue ];
};