var canReorderSingle = require('./reorderable').canReorderSingle;
|
var extractProperties = require('./extract-properties');
|
var isMergeable = require('./is-mergeable');
|
var tidyRuleDuplicates = require('./tidy-rule-duplicates');
|
|
var Token = require('../../tokenizer/token');
|
|
var cloneArray = require('../../utils/clone-array');
|
|
var serializeBody = require('../../writer/one-time').body;
|
var serializeRules = require('../../writer/one-time').rules;
|
|
function naturalSorter(a, b) {
|
return a > b ? 1 : -1;
|
}
|
|
function cloneAndMergeSelectors(propertyA, propertyB) {
|
var cloned = cloneArray(propertyA);
|
cloned[5] = cloned[5].concat(propertyB[5]);
|
|
return cloned;
|
}
|
|
function restructure(tokens, context) {
|
var options = context.options;
|
var mergeablePseudoClasses = options.compatibility.selectors.mergeablePseudoClasses;
|
var mergeablePseudoElements = options.compatibility.selectors.mergeablePseudoElements;
|
var mergeLimit = options.compatibility.selectors.mergeLimit;
|
var multiplePseudoMerging = options.compatibility.selectors.multiplePseudoMerging;
|
var specificityCache = context.cache.specificity;
|
var movableTokens = {};
|
var movedProperties = [];
|
var multiPropertyMoveCache = {};
|
var movedToBeDropped = [];
|
var maxCombinationsLevel = 2;
|
var ID_JOIN_CHARACTER = '%';
|
|
function sendToMultiPropertyMoveCache(position, movedProperty, allFits) {
|
for (var i = allFits.length - 1; i >= 0; i--) {
|
var fit = allFits[i][0];
|
var id = addToCache(movedProperty, fit);
|
|
if (multiPropertyMoveCache[id].length > 1 && processMultiPropertyMove(position, multiPropertyMoveCache[id])) {
|
removeAllMatchingFromCache(id);
|
break;
|
}
|
}
|
}
|
|
function addToCache(movedProperty, fit) {
|
var id = cacheId(fit);
|
multiPropertyMoveCache[id] = multiPropertyMoveCache[id] || [];
|
multiPropertyMoveCache[id].push([movedProperty, fit]);
|
return id;
|
}
|
|
function removeAllMatchingFromCache(matchId) {
|
var matchSelectors = matchId.split(ID_JOIN_CHARACTER);
|
var forRemoval = [];
|
var i;
|
|
for (var id in multiPropertyMoveCache) {
|
var selectors = id.split(ID_JOIN_CHARACTER);
|
for (i = selectors.length - 1; i >= 0; i--) {
|
if (matchSelectors.indexOf(selectors[i]) > -1) {
|
forRemoval.push(id);
|
break;
|
}
|
}
|
}
|
|
for (i = forRemoval.length - 1; i >= 0; i--) {
|
delete multiPropertyMoveCache[forRemoval[i]];
|
}
|
}
|
|
function cacheId(cachedTokens) {
|
var id = [];
|
for (var i = 0, l = cachedTokens.length; i < l; i++) {
|
id.push(serializeRules(cachedTokens[i][1]));
|
}
|
return id.join(ID_JOIN_CHARACTER);
|
}
|
|
function tokensToMerge(sourceTokens) {
|
var uniqueTokensWithBody = [];
|
var mergeableTokens = [];
|
|
for (var i = sourceTokens.length - 1; i >= 0; i--) {
|
if (!isMergeable(serializeRules(sourceTokens[i][1]), mergeablePseudoClasses, mergeablePseudoElements, multiplePseudoMerging)) {
|
continue;
|
}
|
|
mergeableTokens.unshift(sourceTokens[i]);
|
if (sourceTokens[i][2].length > 0 && uniqueTokensWithBody.indexOf(sourceTokens[i]) == -1)
|
uniqueTokensWithBody.push(sourceTokens[i]);
|
}
|
|
return uniqueTokensWithBody.length > 1 ?
|
mergeableTokens :
|
[];
|
}
|
|
function shortenIfPossible(position, movedProperty) {
|
var name = movedProperty[0];
|
var value = movedProperty[1];
|
var key = movedProperty[4];
|
var valueSize = name.length + value.length + 1;
|
var allSelectors = [];
|
var qualifiedTokens = [];
|
|
var mergeableTokens = tokensToMerge(movableTokens[key]);
|
if (mergeableTokens.length < 2)
|
return;
|
|
var allFits = findAllFits(mergeableTokens, valueSize, 1);
|
var bestFit = allFits[0];
|
if (bestFit[1] > 0)
|
return sendToMultiPropertyMoveCache(position, movedProperty, allFits);
|
|
for (var i = bestFit[0].length - 1; i >=0; i--) {
|
allSelectors = bestFit[0][i][1].concat(allSelectors);
|
qualifiedTokens.unshift(bestFit[0][i]);
|
}
|
|
allSelectors = tidyRuleDuplicates(allSelectors);
|
dropAsNewTokenAt(position, [movedProperty], allSelectors, qualifiedTokens);
|
}
|
|
function fitSorter(fit1, fit2) {
|
return fit1[1] > fit2[1] ? 1 : (fit1[1] == fit2[1] ? 0 : -1);
|
}
|
|
function findAllFits(mergeableTokens, propertySize, propertiesCount) {
|
var combinations = allCombinations(mergeableTokens, propertySize, propertiesCount, maxCombinationsLevel - 1);
|
return combinations.sort(fitSorter);
|
}
|
|
function allCombinations(tokensVariant, propertySize, propertiesCount, level) {
|
var differenceVariants = [[tokensVariant, sizeDifference(tokensVariant, propertySize, propertiesCount)]];
|
if (tokensVariant.length > 2 && level > 0) {
|
for (var i = tokensVariant.length - 1; i >= 0; i--) {
|
var subVariant = Array.prototype.slice.call(tokensVariant, 0);
|
subVariant.splice(i, 1);
|
differenceVariants = differenceVariants.concat(allCombinations(subVariant, propertySize, propertiesCount, level - 1));
|
}
|
}
|
|
return differenceVariants;
|
}
|
|
function sizeDifference(tokensVariant, propertySize, propertiesCount) {
|
var allSelectorsSize = 0;
|
for (var i = tokensVariant.length - 1; i >= 0; i--) {
|
allSelectorsSize += tokensVariant[i][2].length > propertiesCount ? serializeRules(tokensVariant[i][1]).length : -1;
|
}
|
return allSelectorsSize - (tokensVariant.length - 1) * propertySize + 1;
|
}
|
|
function dropAsNewTokenAt(position, properties, allSelectors, mergeableTokens) {
|
var i, j, k, m;
|
var allProperties = [];
|
|
for (i = mergeableTokens.length - 1; i >= 0; i--) {
|
var mergeableToken = mergeableTokens[i];
|
|
for (j = mergeableToken[2].length - 1; j >= 0; j--) {
|
var mergeableProperty = mergeableToken[2][j];
|
|
for (k = 0, m = properties.length; k < m; k++) {
|
var property = properties[k];
|
|
var mergeablePropertyName = mergeableProperty[1][1];
|
var propertyName = property[0];
|
var propertyBody = property[4];
|
if (mergeablePropertyName == propertyName && serializeBody([mergeableProperty]) == propertyBody) {
|
mergeableToken[2].splice(j, 1);
|
break;
|
}
|
}
|
}
|
}
|
|
for (i = properties.length - 1; i >= 0; i--) {
|
allProperties.unshift(properties[i][3]);
|
}
|
|
var newToken = [Token.RULE, allSelectors, allProperties];
|
tokens.splice(position, 0, newToken);
|
}
|
|
function dropPropertiesAt(position, movedProperty) {
|
var key = movedProperty[4];
|
var toMove = movableTokens[key];
|
|
if (toMove && toMove.length > 1) {
|
if (!shortenMultiMovesIfPossible(position, movedProperty))
|
shortenIfPossible(position, movedProperty);
|
}
|
}
|
|
function shortenMultiMovesIfPossible(position, movedProperty) {
|
var candidates = [];
|
var propertiesAndMergableTokens = [];
|
var key = movedProperty[4];
|
var j, k;
|
|
var mergeableTokens = tokensToMerge(movableTokens[key]);
|
if (mergeableTokens.length < 2)
|
return;
|
|
movableLoop:
|
for (var value in movableTokens) {
|
var tokensList = movableTokens[value];
|
|
for (j = mergeableTokens.length - 1; j >= 0; j--) {
|
if (tokensList.indexOf(mergeableTokens[j]) == -1)
|
continue movableLoop;
|
}
|
|
candidates.push(value);
|
}
|
|
if (candidates.length < 2)
|
return false;
|
|
for (j = candidates.length - 1; j >= 0; j--) {
|
for (k = movedProperties.length - 1; k >= 0; k--) {
|
if (movedProperties[k][4] == candidates[j]) {
|
propertiesAndMergableTokens.unshift([movedProperties[k], mergeableTokens]);
|
break;
|
}
|
}
|
}
|
|
return processMultiPropertyMove(position, propertiesAndMergableTokens);
|
}
|
|
function processMultiPropertyMove(position, propertiesAndMergableTokens) {
|
var valueSize = 0;
|
var properties = [];
|
var property;
|
|
for (var i = propertiesAndMergableTokens.length - 1; i >= 0; i--) {
|
property = propertiesAndMergableTokens[i][0];
|
var fullValue = property[4];
|
valueSize += fullValue.length + (i > 0 ? 1 : 0);
|
|
properties.push(property);
|
}
|
|
var mergeableTokens = propertiesAndMergableTokens[0][1];
|
var bestFit = findAllFits(mergeableTokens, valueSize, properties.length)[0];
|
if (bestFit[1] > 0)
|
return false;
|
|
var allSelectors = [];
|
var qualifiedTokens = [];
|
for (i = bestFit[0].length - 1; i >= 0; i--) {
|
allSelectors = bestFit[0][i][1].concat(allSelectors);
|
qualifiedTokens.unshift(bestFit[0][i]);
|
}
|
|
allSelectors = tidyRuleDuplicates(allSelectors);
|
dropAsNewTokenAt(position, properties, allSelectors, qualifiedTokens);
|
|
for (i = properties.length - 1; i >= 0; i--) {
|
property = properties[i];
|
var index = movedProperties.indexOf(property);
|
|
delete movableTokens[property[4]];
|
|
if (index > -1 && movedToBeDropped.indexOf(index) == -1)
|
movedToBeDropped.push(index);
|
}
|
|
return true;
|
}
|
|
function boundToAnotherPropertyInCurrrentToken(property, movedProperty, token) {
|
var propertyName = property[0];
|
var movedPropertyName = movedProperty[0];
|
if (propertyName != movedPropertyName)
|
return false;
|
|
var key = movedProperty[4];
|
var toMove = movableTokens[key];
|
return toMove && toMove.indexOf(token) > -1;
|
}
|
|
for (var i = tokens.length - 1; i >= 0; i--) {
|
var token = tokens[i];
|
var isRule;
|
var j, k, m;
|
var samePropertyAt;
|
|
if (token[0] == Token.RULE) {
|
isRule = true;
|
} else if (token[0] == Token.NESTED_BLOCK) {
|
isRule = false;
|
} else {
|
continue;
|
}
|
|
// We cache movedProperties.length as it may change in the loop
|
var movedCount = movedProperties.length;
|
|
var properties = extractProperties(token);
|
movedToBeDropped = [];
|
|
var unmovableInCurrentToken = [];
|
for (j = properties.length - 1; j >= 0; j--) {
|
for (k = j - 1; k >= 0; k--) {
|
if (!canReorderSingle(properties[j], properties[k], specificityCache)) {
|
unmovableInCurrentToken.push(j);
|
break;
|
}
|
}
|
}
|
|
for (j = properties.length - 1; j >= 0; j--) {
|
var property = properties[j];
|
var movedSameProperty = false;
|
|
for (k = 0; k < movedCount; k++) {
|
var movedProperty = movedProperties[k];
|
|
if (movedToBeDropped.indexOf(k) == -1 && (!canReorderSingle(property, movedProperty, specificityCache) && !boundToAnotherPropertyInCurrrentToken(property, movedProperty, token) ||
|
movableTokens[movedProperty[4]] && movableTokens[movedProperty[4]].length === mergeLimit)) {
|
dropPropertiesAt(i + 1, movedProperty, token);
|
|
if (movedToBeDropped.indexOf(k) == -1) {
|
movedToBeDropped.push(k);
|
delete movableTokens[movedProperty[4]];
|
}
|
}
|
|
if (!movedSameProperty) {
|
movedSameProperty = property[0] == movedProperty[0] && property[1] == movedProperty[1];
|
|
if (movedSameProperty) {
|
samePropertyAt = k;
|
}
|
}
|
}
|
|
if (!isRule || unmovableInCurrentToken.indexOf(j) > -1)
|
continue;
|
|
var key = property[4];
|
|
if (movedSameProperty && movedProperties[samePropertyAt][5].length + property[5].length > mergeLimit) {
|
dropPropertiesAt(i + 1, movedProperties[samePropertyAt]);
|
movedProperties.splice(samePropertyAt, 1);
|
movableTokens[key] = [token];
|
movedSameProperty = false;
|
} else {
|
movableTokens[key] = movableTokens[key] || [];
|
movableTokens[key].push(token);
|
}
|
|
if (movedSameProperty) {
|
movedProperties[samePropertyAt] = cloneAndMergeSelectors(movedProperties[samePropertyAt], property);
|
} else {
|
movedProperties.push(property);
|
}
|
}
|
|
movedToBeDropped = movedToBeDropped.sort(naturalSorter);
|
for (j = 0, m = movedToBeDropped.length; j < m; j++) {
|
var dropAt = movedToBeDropped[j] - j;
|
movedProperties.splice(dropAt, 1);
|
}
|
}
|
|
var position = tokens[0] && tokens[0][0] == Token.AT_RULE && tokens[0][1].indexOf('@charset') === 0 ? 1 : 0;
|
for (; position < tokens.length - 1; position++) {
|
var isImportRule = tokens[position][0] === Token.AT_RULE && tokens[position][1].indexOf('@import') === 0;
|
var isComment = tokens[position][0] === Token.COMMENT;
|
if (!(isImportRule || isComment))
|
break;
|
}
|
|
for (i = 0; i < movedProperties.length; i++) {
|
dropPropertiesAt(position, movedProperties[i]);
|
}
|
}
|
|
module.exports = restructure;
|
