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var isMergeable = require('./is-mergeable');
var optimizeProperties = require('./properties/optimize');
var cloneArray = require('../../utils/clone-array');
var Token = require('../../tokenizer/token');
var serializeBody = require('../../writer/one-time').body;
var serializeRules = require('../../writer/one-time').rules;
function reduceNonAdjacent(tokens, context) {
var options = context.options;
var mergeablePseudoClasses = options.compatibility.selectors.mergeablePseudoClasses;
var mergeablePseudoElements = options.compatibility.selectors.mergeablePseudoElements;
var multiplePseudoMerging = options.compatibility.selectors.multiplePseudoMerging;
var candidates = {};
var repeated = [];
for (var i = tokens.length - 1; i >= 0; i--) {
var token = tokens[i];
if (token[0] != Token.RULE) {
continue;
} else if (token[2].length === 0) {
continue;
}
var selectorAsString = serializeRules(token[1]);
var isComplexAndNotSpecial = token[1].length > 1
&& isMergeable(selectorAsString, mergeablePseudoClasses, mergeablePseudoElements, multiplePseudoMerging);
var wrappedSelectors = wrappedSelectorsFrom(token[1]);
var selectors = isComplexAndNotSpecial
? [selectorAsString].concat(wrappedSelectors)
: [selectorAsString];
for (var j = 0, m = selectors.length; j < m; j++) {
var selector = selectors[j];
if (!candidates[selector]) { candidates[selector] = []; } else { repeated.push(selector); }
candidates[selector].push({
where: i,
list: wrappedSelectors,
isPartial: isComplexAndNotSpecial && j > 0,
isComplex: isComplexAndNotSpecial && j === 0
});
}
}
reduceSimpleNonAdjacentCases(tokens, repeated, candidates, options, context);
reduceComplexNonAdjacentCases(tokens, candidates, options, context);
}
function wrappedSelectorsFrom(list) {
var wrapped = [];
for (var i = 0; i < list.length; i++) {
wrapped.push([list[i][1]]);
}
return wrapped;
}
function reduceSimpleNonAdjacentCases(tokens, repeated, candidates, options, context) {
function filterOut(idx, bodies) {
return data[idx].isPartial && bodies.length === 0;
}
function reduceBody(token, newBody, processedCount, tokenIdx) {
if (!data[processedCount - tokenIdx - 1].isPartial) { token[2] = newBody; }
}
for (var i = 0, l = repeated.length; i < l; i++) {
var selector = repeated[i];
var data = candidates[selector];
reduceSelector(tokens, data, {
filterOut: filterOut,
callback: reduceBody
}, options, context);
}
}
function reduceComplexNonAdjacentCases(tokens, candidates, options, context) {
var mergeablePseudoClasses = options.compatibility.selectors.mergeablePseudoClasses;
var mergeablePseudoElements = options.compatibility.selectors.mergeablePseudoElements;
var multiplePseudoMerging = options.compatibility.selectors.multiplePseudoMerging;
var localContext = {};
function filterOut(idx) {
return localContext.data[idx].where < localContext.intoPosition;
}
function collectReducedBodies(token, newBody, processedCount, tokenIdx) {
if (tokenIdx === 0) { localContext.reducedBodies.push(newBody); }
}
allSelectors:
for (var complexSelector in candidates) {
var into = candidates[complexSelector];
if (!into[0].isComplex) { continue; }
var intoPosition = into[into.length - 1].where;
var intoToken = tokens[intoPosition];
var reducedBodies = [];
var selectors = isMergeable(complexSelector, mergeablePseudoClasses, mergeablePseudoElements, multiplePseudoMerging)
? into[0].list
: [complexSelector];
localContext.intoPosition = intoPosition;
localContext.reducedBodies = reducedBodies;
for (var j = 0, m = selectors.length; j < m; j++) {
var selector = selectors[j];
var data = candidates[selector];
if (data.length < 2) { continue allSelectors; }
localContext.data = data;
reduceSelector(tokens, data, {
filterOut: filterOut,
callback: collectReducedBodies
}, options, context);
if (serializeBody(reducedBodies[reducedBodies.length - 1]) != serializeBody(reducedBodies[0])) {
continue allSelectors;
}
}
intoToken[2] = reducedBodies[0];
}
}
function reduceSelector(tokens, data, context, options, outerContext) {
var bodies = [];
var bodiesAsList = [];
var processedTokens = [];
for (var j = data.length - 1; j >= 0; j--) {
if (context.filterOut(j, bodies)) { continue; }
var where = data[j].where;
var token = tokens[where];
var clonedBody = cloneArray(token[2]);
bodies = bodies.concat(clonedBody);
bodiesAsList.push(clonedBody);
processedTokens.push(where);
}
optimizeProperties(bodies, true, false, outerContext);
var processedCount = processedTokens.length;
var propertyIdx = bodies.length - 1;
var tokenIdx = processedCount - 1;
while (tokenIdx >= 0) {
if ((tokenIdx === 0
|| (bodies[propertyIdx] && bodiesAsList[tokenIdx].indexOf(bodies[propertyIdx]) > -1)) && propertyIdx > -1) {
propertyIdx--;
continue;
}
var newBody = bodies.splice(propertyIdx + 1);
context.callback(tokens[processedTokens[tokenIdx]], newBody, processedCount, tokenIdx);
tokenIdx--;
}
}
module.exports = reduceNonAdjacent;
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