152 lines
3.9 KiB
JavaScript
152 lines
3.9 KiB
JavaScript
var hasOwnProperty = Object.prototype.hasOwnProperty;
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function isEqualSelectors(a, b) {
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var cursor1 = a.head;
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var cursor2 = b.head;
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while (cursor1 !== null && cursor2 !== null && cursor1.data.id === cursor2.data.id) {
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cursor1 = cursor1.next;
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cursor2 = cursor2.next;
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}
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return cursor1 === null && cursor2 === null;
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}
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function isEqualDeclarations(a, b) {
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var cursor1 = a.head;
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var cursor2 = b.head;
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while (cursor1 !== null && cursor2 !== null && cursor1.data.id === cursor2.data.id) {
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cursor1 = cursor1.next;
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cursor2 = cursor2.next;
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}
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return cursor1 === null && cursor2 === null;
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}
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function compareDeclarations(declarations1, declarations2) {
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var result = {
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eq: [],
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ne1: [],
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ne2: [],
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ne2overrided: []
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};
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var fingerprints = Object.create(null);
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var declarations2hash = Object.create(null);
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for (var cursor = declarations2.head; cursor; cursor = cursor.next) {
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declarations2hash[cursor.data.id] = true;
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}
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for (var cursor = declarations1.head; cursor; cursor = cursor.next) {
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var data = cursor.data;
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if (data.fingerprint) {
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fingerprints[data.fingerprint] = data.important;
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}
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if (declarations2hash[data.id]) {
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declarations2hash[data.id] = false;
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result.eq.push(data);
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} else {
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result.ne1.push(data);
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}
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}
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for (var cursor = declarations2.head; cursor; cursor = cursor.next) {
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var data = cursor.data;
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if (declarations2hash[data.id]) {
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// when declarations1 has an overriding declaration, this is not a difference
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// unless no !important is used on prev and !important is used on the following
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if (!hasOwnProperty.call(fingerprints, data.fingerprint) ||
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(!fingerprints[data.fingerprint] && data.important)) {
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result.ne2.push(data);
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}
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result.ne2overrided.push(data);
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}
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}
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return result;
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}
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function addSelectors(dest, source) {
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source.each(function(sourceData) {
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var newStr = sourceData.id;
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var cursor = dest.head;
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while (cursor) {
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var nextStr = cursor.data.id;
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if (nextStr === newStr) {
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return;
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}
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if (nextStr > newStr) {
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break;
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}
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cursor = cursor.next;
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}
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dest.insert(dest.createItem(sourceData), cursor);
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});
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return dest;
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}
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// check if simpleselectors has no equal specificity and element selector
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function hasSimilarSelectors(selectors1, selectors2) {
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var cursor1 = selectors1.head;
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while (cursor1 !== null) {
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var cursor2 = selectors2.head;
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while (cursor2 !== null) {
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if (cursor1.data.compareMarker === cursor2.data.compareMarker) {
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return true;
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}
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cursor2 = cursor2.next;
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}
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cursor1 = cursor1.next;
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}
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return false;
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}
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// test node can't to be skipped
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function unsafeToSkipNode(node) {
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switch (node.type) {
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case 'Rule':
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// unsafe skip ruleset with selector similarities
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return hasSimilarSelectors(node.prelude.children, this);
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case 'Atrule':
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// can skip at-rules with blocks
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if (node.block) {
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// unsafe skip at-rule if block contains something unsafe to skip
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return node.block.children.some(unsafeToSkipNode, this);
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}
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break;
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case 'Declaration':
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return false;
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}
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// unsafe by default
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return true;
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}
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module.exports = {
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isEqualSelectors: isEqualSelectors,
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isEqualDeclarations: isEqualDeclarations,
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compareDeclarations: compareDeclarations,
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addSelectors: addSelectors,
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hasSimilarSelectors: hasSimilarSelectors,
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unsafeToSkipNode: unsafeToSkipNode
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};
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