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77 lines
2.5 KiB
JavaScript
77 lines
2.5 KiB
JavaScript
5 years ago
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var optimizeProperties = require('../properties/optimizer');
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var stringifySelectors = require('../stringifier/one-time').selectors;
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var extractProperties = require('./extractor');
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var canReorder = require('./reorderable').canReorder;
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function mergeNonAdjacentBySelector(tokens, options, context) {
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var allSelectors = {};
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var repeatedSelectors = [];
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var i;
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for (i = tokens.length - 1; i >= 0; i--) {
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if (tokens[i][0] != 'selector')
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continue;
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if (tokens[i][2].length === 0)
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continue;
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var selector = stringifySelectors(tokens[i][1]);
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allSelectors[selector] = [i].concat(allSelectors[selector] || []);
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if (allSelectors[selector].length == 2)
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repeatedSelectors.push(selector);
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}
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for (i = repeatedSelectors.length - 1; i >= 0; i--) {
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var positions = allSelectors[repeatedSelectors[i]];
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selectorIterator:
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for (var j = positions.length - 1; j > 0; j--) {
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var positionOne = positions[j - 1];
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var tokenOne = tokens[positionOne];
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var positionTwo = positions[j];
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var tokenTwo = tokens[positionTwo];
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directionIterator:
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for (var direction = 1; direction >= -1; direction -= 2) {
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var topToBottom = direction == 1;
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var from = topToBottom ? positionOne + 1 : positionTwo - 1;
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var to = topToBottom ? positionTwo : positionOne;
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var delta = topToBottom ? 1 : -1;
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var moved = topToBottom ? tokenOne : tokenTwo;
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var target = topToBottom ? tokenTwo : tokenOne;
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var movedProperties = extractProperties(moved);
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var joinAt;
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while (from != to) {
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var traversedProperties = extractProperties(tokens[from]);
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from += delta;
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// traversed then moved as we move selectors towards the start
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var reorderable = topToBottom ?
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canReorder(movedProperties, traversedProperties) :
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canReorder(traversedProperties, movedProperties);
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if (!reorderable && !topToBottom)
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continue selectorIterator;
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if (!reorderable && topToBottom)
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continue directionIterator;
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}
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if (topToBottom) {
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joinAt = [moved[2].length];
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Array.prototype.push.apply(moved[2], target[2]);
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target[2] = moved[2];
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} else {
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joinAt = [target[2].length];
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Array.prototype.push.apply(target[2], moved[2]);
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}
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optimizeProperties(target[1], target[2], joinAt, true, options, context);
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moved[2] = [];
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}
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}
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}
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}
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module.exports = mergeNonAdjacentBySelector;
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