/**
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* @function
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* @memberof Modifiers
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* @argument {Object} data - The data object generated by `update` method
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* @argument {Object} options - Modifiers configuration and options
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* @returns {Object} The data object, properly modified
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*/
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export default function shift(data) {
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const placement = data.placement;
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const basePlacement = placement.split('-')[0];
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const shiftvariation = placement.split('-')[1];
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// if shift shiftvariation is specified, run the modifier
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if (shiftvariation) {
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const { reference, popper } = data.offsets;
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const isVertical = ['bottom', 'top'].indexOf(basePlacement) !== -1;
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const side = isVertical ? 'left' : 'top';
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const measurement = isVertical ? 'width' : 'height';
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const shiftOffsets = {
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start: { [side]: reference[side] },
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end: {
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[side]: reference[side] + reference[measurement] - popper[measurement],
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},
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};
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data.offsets.popper = { ...popper, ...shiftOffsets[shiftvariation] };
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}
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return data;
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}
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