94 lines
3.7 KiB
JavaScript
94 lines
3.7 KiB
JavaScript
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// TODO: it'd be great to merge it with the other canReorder functionality
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var rulesOverlap = require('./rules-overlap');
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var specificitiesOverlap = require('./specificities-overlap');
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var FLEX_PROPERTIES = /align-items|box-align|box-pack|flex|justify/;
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var BORDER_PROPERTIES = /^border-(top|right|bottom|left|color|style|width|radius)/;
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function canReorder(left, right, cache) {
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for (var i = right.length - 1; i >= 0; i--) {
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for (var j = left.length - 1; j >= 0; j--) {
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if (!canReorderSingle(left[j], right[i], cache)) { return false; }
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}
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}
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return true;
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}
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function canReorderSingle(left, right, cache) {
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var leftName = left[0];
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var leftValue = left[1];
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var leftNameRoot = left[2];
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var leftSelector = left[5];
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var leftInSpecificSelector = left[6];
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var rightName = right[0];
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var rightValue = right[1];
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var rightNameRoot = right[2];
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var rightSelector = right[5];
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var rightInSpecificSelector = right[6];
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if (leftName == 'font' && rightName == 'line-height' || rightName == 'font' && leftName == 'line-height') { return false; }
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if (FLEX_PROPERTIES.test(leftName) && FLEX_PROPERTIES.test(rightName)) { return false; }
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if (leftNameRoot == rightNameRoot
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&& unprefixed(leftName) == unprefixed(rightName)
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&& (vendorPrefixed(leftName) ^ vendorPrefixed(rightName))) { return false; }
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if (leftNameRoot == 'border' && BORDER_PROPERTIES.test(rightNameRoot) && (leftName == 'border' || leftName == rightNameRoot || (leftValue != rightValue && sameBorderComponent(leftName, rightName)))) { return false; }
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if (rightNameRoot == 'border' && BORDER_PROPERTIES.test(leftNameRoot) && (rightName == 'border' || rightName == leftNameRoot || (leftValue != rightValue && sameBorderComponent(leftName, rightName)))) { return false; }
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if (leftNameRoot == 'border' && rightNameRoot == 'border' && leftName != rightName && (isSideBorder(leftName) && isStyleBorder(rightName) || isStyleBorder(leftName) && isSideBorder(rightName))) { return false; }
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if (leftNameRoot != rightNameRoot) { return true; }
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if (leftName == rightName
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&& leftNameRoot == rightNameRoot
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&& (leftValue == rightValue || withDifferentVendorPrefix(leftValue, rightValue))) { return true; }
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if (leftName != rightName
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&& leftNameRoot == rightNameRoot
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&& leftName != leftNameRoot
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&& rightName != rightNameRoot) { return true; }
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if (leftName != rightName
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&& leftNameRoot == rightNameRoot
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&& leftValue == rightValue) { return true; }
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if (rightInSpecificSelector
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&& leftInSpecificSelector
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&& !inheritable(leftNameRoot)
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&& !inheritable(rightNameRoot)
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&& !rulesOverlap(rightSelector, leftSelector, false)) { return true; }
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if (!specificitiesOverlap(leftSelector, rightSelector, cache)) { return true; }
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return false;
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}
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function vendorPrefixed(name) {
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return /^-(?:moz|webkit|ms|o)-/.test(name);
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}
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function unprefixed(name) {
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return name.replace(/^-(?:moz|webkit|ms|o)-/, '');
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}
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function sameBorderComponent(name1, name2) {
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return name1.split('-').pop() == name2.split('-').pop();
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}
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function isSideBorder(name) {
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return name == 'border-top' || name == 'border-right' || name == 'border-bottom' || name == 'border-left';
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}
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function isStyleBorder(name) {
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return name == 'border-color' || name == 'border-style' || name == 'border-width';
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}
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function withDifferentVendorPrefix(value1, value2) {
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return vendorPrefixed(value1) && vendorPrefixed(value2) && value1.split('-')[1] != value2.split('-')[2];
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}
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function inheritable(name) {
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// According to http://www.w3.org/TR/CSS21/propidx.html
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// Others will be catched by other, preceeding rules
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return name == 'font' || name == 'line-height' || name == 'list-style';
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}
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module.exports = {
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canReorder: canReorder,
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canReorderSingle: canReorderSingle
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};
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