mirror of
https://github.com/swc-project/swc.git
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114 lines
3.5 KiB
JavaScript
114 lines
3.5 KiB
JavaScript
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function parseOffset(offset, popperOffsets, referenceOffsets, basePlacement) {
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var offsets = [0, 0];
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// Use height if placement is left or right and index is 0 otherwise use width
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// in this way the first offset will use an axis and the second one
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// will use the other one
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var useHeight = ['right', 'left'].indexOf(basePlacement) !== -1;
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// Split the offset string to obtain a list of values and operands
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// The regex addresses values with the plus or minus sign in front (+10, -20, etc)
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var fragments = offset.split(/(\+|\-)/).map(function (frag) {
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return frag.trim();
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});
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// Detect if the offset string contains a pair of values or a single one
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// they could be separated by comma or space
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var divider = fragments.indexOf(find(fragments, function (frag) {
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return frag.search(/,|\s/) !== -1;
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}));
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if (fragments[divider] && fragments[divider].indexOf(',') === -1) {
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console.warn('Offsets separated by white space(s) are deprecated, use a comma (,) instead.');
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}
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// If divider is found, we divide the list of values and operands to divide
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// them by ofset X and Y.
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var splitRegex = /\s*,\s*|\s+/;
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var ops = divider !== -1 ? [fragments.slice(0, divider).concat([fragments[divider].split(splitRegex)[0]]), [fragments[divider].split(splitRegex)[1]].concat(fragments.slice(divider + 1))] : [fragments];
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// Convert the values with units to absolute pixels to allow our computations
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ops = ops.map(function (op, index) {
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// Most of the units rely on the orientation of the popper
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var measurement = (index === 1 ? !useHeight : useHeight) ? 'height' : 'width';
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var mergeWithPrevious = false;
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return op
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// This aggregates any `+` or `-` sign that aren't considered operators
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// e.g.: 10 + +5 => [10, +, +5]
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.reduce(function (a, b) {
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if (a[a.length - 1] === '' && ['+', '-'].indexOf(b) !== -1) {
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a[a.length - 1] = b;
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mergeWithPrevious = true;
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return a;
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} else if (mergeWithPrevious) {
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a[a.length - 1] += b;
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mergeWithPrevious = false;
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return a;
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} else {
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return a.concat(b);
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}
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}, [])
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// Here we convert the string values into number values (in px)
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.map(function (str) {
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return toValue(str, measurement, popperOffsets, referenceOffsets);
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});
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});
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// Loop trough the offsets arrays and execute the operations
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ops.forEach(function (op, index) {
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op.forEach(function (frag, index2) {
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if (isNumeric(frag)) {
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offsets[index] += frag * (op[index2 - 1] === '-' ? -1 : 1);
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}
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});
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});
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return offsets;
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}
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function offset(data, _ref) {
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var offset = _ref.offset;
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var placement = data.placement,
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_data$offsets = data.offsets,
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popper = _data$offsets.popper,
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reference = _data$offsets.reference;
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var basePlacement = placement.split('-')[0];
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var offsets = void 0;
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if (isNumeric(+offset)) {
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offsets = [+offset, 0];
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} else {
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offsets = parseOffset(offset, popper, reference, basePlacement);
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}
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if (basePlacement === 'left') {
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popper.top += offsets[0];
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popper.left -= offsets[1];
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} else if (basePlacement === 'right') {
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popper.top += offsets[0];
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popper.left += offsets[1];
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} else if (basePlacement === 'top') {
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popper.left += offsets[0];
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popper.top -= offsets[1];
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} else if (basePlacement === 'bottom') {
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popper.left += offsets[0];
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popper.top += offsets[1];
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}
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data.popper = popper;
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return data;
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}
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export var modifiers = {
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offset: {
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order: 200,
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enabled: true,
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fn: offset,
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offset: 0
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},
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};
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