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tree from '../tree';\nimport Visitor from './visitor';\nimport logger from '../logger';\nimport * as utils from '../utils';\n\n/* jshint loopfunc:true */\n\nclass ExtendFinderVisitor {\n constructor() {\n this._visitor = new Visitor(this);\n this.contexts = [];\n this.allExtendsStack = [[]];\n }\n\n run(root) {\n root = this._visitor.visit(root);\n root.allExtends = this.allExtendsStack[0];\n return root;\n }\n\n visitDeclaration(declNode, visitArgs) {\n visitArgs.visitDeeper = false;\n }\n\n visitMixinDefinition(mixinDefinitionNode, visitArgs) {\n visitArgs.visitDeeper = false;\n }\n\n visitRuleset(rulesetNode, visitArgs) {\n if (rulesetNode.root) {\n return;\n }\n\n let i;\n let j;\n let extend;\n const allSelectorsExtendList = [];\n let extendList;\n\n // get &:extend(.a); rules which apply to all selectors in this ruleset\n const rules = rulesetNode.rules, ruleCnt = rules ? rules.length : 0;\n for (i = 0; i < ruleCnt; i++) {\n if (rulesetNode.rules[i] instanceof tree.Extend) {\n allSelectorsExtendList.push(rules[i]);\n rulesetNode.extendOnEveryPath = true;\n }\n }\n\n // now find every selector and apply the extends that apply to all extends\n // and the ones which apply to an individual extend\n const paths = rulesetNode.paths;\n for (i = 0; i < paths.length; i++) {\n const selectorPath = paths[i], selector = selectorPath[selectorPath.length - 1], selExtendList = selector.extendList;\n\n extendList = selExtendList ? utils.copyArray(selExtendList).concat(allSelectorsExtendList)\n : allSelectorsExtendList;\n\n if (extendList) {\n extendList = extendList.map(function(allSelectorsExtend) {\n return allSelectorsExtend.clone();\n });\n }\n\n for (j = 0; j < extendList.length; j++) {\n this.foundExtends = true;\n extend = extendList[j];\n extend.findSelfSelectors(selectorPath);\n extend.ruleset = rulesetNode;\n if (j === 0) { extend.firstExtendOnThisSelectorPath = true; }\n this.allExtendsStack[this.allExtendsStack.length - 1].push(extend);\n }\n }\n\n this.contexts.push(rulesetNode.selectors);\n }\n\n visitRulesetOut(rulesetNode) {\n if (!rulesetNode.root) {\n this.contexts.length = this.contexts.length - 1;\n }\n }\n\n visitMedia(mediaNode, visitArgs) {\n mediaNode.allExtends = [];\n this.allExtendsStack.push(mediaNode.allExtends);\n }\n\n visitMediaOut(mediaNode) {\n this.allExtendsStack.length = this.allExtendsStack.length - 1;\n }\n\n visitAtRule(atRuleNode, visitArgs) {\n atRuleNode.allExtends = [];\n this.allExtendsStack.push(atRuleNode.allExtends);\n }\n\n visitAtRuleOut(atRuleNode) {\n this.allExtendsStack.length = this.allExtendsStack.length - 1;\n }\n}\n\nclass ProcessExtendsVisitor {\n constructor() {\n this._visitor = new Visitor(this);\n }\n\n run(root) {\n const extendFinder = new ExtendFinderVisitor();\n this.extendIndices = {};\n extendFinder.run(root);\n if (!extendFinder.foundExtends) { return root; }\n root.allExtends = root.allExtends.concat(this.doExtendChaining(root.allExtends, root.allExtends));\n this.allExtendsStack = [root.allExtends];\n const newRoot = this._visitor.visit(root);\n this.checkExtendsForNonMatched(root.allExtends);\n return newRoot;\n }\n\n checkExtendsForNonMatched(extendList) {\n const indices = this.extendIndices;\n extendList.filter(function(extend) {\n return !extend.hasFoundMatches && extend.parent_ids.length == 1;\n }).forEach(function(extend) {\n let selector = '_unknown_';\n try {\n selector = extend.selector.toCSS({});\n }\n catch (_) {}\n\n if (!indices[`${extend.index} ${selector}`]) {\n indices[`${extend.index} ${selector}`] = true;\n logger.warn(`extend '${selector}' has no matches`);\n }\n });\n }\n\n doExtendChaining(extendsList, extendsListTarget, iterationCount) {\n //\n // chaining is different from normal extension.. if we extend an extend then we are not just copying, altering\n // and pasting the selector we would do normally, but we are also adding an extend with the same target selector\n // this means this new extend can then go and alter other extends\n //\n // this method deals with all the chaining work - without it, extend is flat and doesn't work on other extend selectors\n // this is also the most expensive.. and a match on one selector can cause an extension of a selector we had already\n // processed if we look at each selector at a time, as is done in visitRuleset\n\n let extendIndex;\n\n let targetExtendIndex;\n let matches;\n const extendsToAdd = [];\n let newSelector;\n const extendVisitor = this;\n let selectorPath;\n let extend;\n let targetExtend;\n let newExtend;\n\n iterationCount = iterationCount || 0;\n\n // loop through comparing every extend with every target extend.\n // a target extend is the one on the ruleset we are looking at copy/edit/pasting in place\n // e.g. .a:extend(.b) {} and .b:extend(.c) {} then the first extend extends the second one\n // and the second is the target.\n // the separation into two lists allows us to process a subset of chains with a bigger set, as is the\n // case when processing media queries\n for (extendIndex = 0; extendIndex < extendsList.length; extendIndex++) {\n for (targetExtendIndex = 0; targetExtendIndex < extendsListTarget.length; targetExtendIndex++) {\n\n extend = extendsList[extendIndex];\n targetExtend = extendsListTarget[targetExtendIndex];\n\n // look for circular references\n if ( extend.parent_ids.indexOf( targetExtend.object_id ) >= 0 ) { continue; }\n\n // find a match in the target extends self selector (the bit before :extend)\n selectorPath = [targetExtend.selfSelectors[0]];\n matches = extendVisitor.findMatch(extend, selectorPath);\n\n if (matches.length) {\n extend.hasFoundMatches = true;\n\n // we found a match, so for each self selector..\n extend.selfSelectors.forEach(function(selfSelector) {\n const info = targetExtend.visibilityInfo();\n\n // process the extend as usual\n newSelector = extendVisitor.extendSelector(matches, selectorPath, selfSelector, extend.isVisible());\n\n // but now we create a new extend from it\n newExtend = new(tree.Extend)(targetExtend.selector, targetExtend.option, 0, targetExtend.fileInfo(), info);\n newExtend.selfSelectors = newSelector;\n\n // add the extend onto the list of extends for that selector\n newSelector[newSelector.length - 1].extendList = [newExtend];\n\n // record that we need to add it.\n extendsToAdd.push(newExtend);\n newExtend.ruleset = targetExtend.ruleset;\n\n // remember its parents for circular references\n newExtend.parent_ids = newExtend.parent_ids.concat(targetExtend.parent_ids, extend.parent_ids);\n\n // only process the selector once.. if we have :extend(.a,.b) then multiple\n // extends will look at the same selector path, so when extending\n // we know that any others will be duplicates in terms of what is added to the css\n if (targetExtend.firstExtendOnThisSelectorPath) {\n newExtend.firstExtendOnThisSelectorPath = true;\n targetExtend.ruleset.paths.push(newSelector);\n }\n });\n }\n }\n }\n\n if (extendsToAdd.length) {\n // try to detect circular references to stop a stack overflow.\n // may no longer be needed.\n this.extendChainCount++;\n if (iterationCount > 100) {\n let selectorOne = '{unable to calculate}';\n let selectorTwo = '{unable to calculate}';\n try {\n selectorOne = extendsToAdd[0].selfSelectors[0].toCSS();\n selectorTwo = extendsToAdd[0].selector.toCSS();\n }\n catch (e) {}\n throw { message: `extend circular reference detected. One of the circular extends is currently:${selectorOne}:extend(${selectorTwo})`};\n }\n\n // now process the new extends on the existing rules so that we can handle a extending b extending c extending\n // d extending e...\n return extendsToAdd.concat(extendVisitor.doExtendChaining(extendsToAdd, extendsListTarget, iterationCount + 1));\n } else {\n return extendsToAdd;\n }\n }\n\n visitDeclaration(ruleNode, visitArgs) {\n visitArgs.visitDeeper = false;\n }\n\n visitMixinDefinition(mixinDefinitionNode, visitArgs) {\n visitArgs.visitDeeper = false;\n }\n\n visitSelector(selectorNode, visitArgs) {\n visitArgs.visitDeeper = false;\n }\n\n visitRuleset(rulesetNode, visitArgs) {\n if (rulesetNode.root) {\n return;\n }\n let matches;\n let pathIndex;\n let extendIndex;\n const allExtends = this.allExtendsStack[this.allExtendsStack.length - 1];\n const selectorsToAdd = [];\n const extendVisitor = this;\n let selectorPath;\n\n // look at each selector path in the ruleset, find any extend matches and then copy, find and replace\n\n for (extendIndex = 0; extendIndex < allExtends.length; extendIndex++) {\n for (pathIndex = 0; pathIndex < rulesetNode.paths.length; pathIndex++) {\n selectorPath = rulesetNode.paths[pathIndex];\n\n // extending extends happens initially, before the main pass\n if (rulesetNode.extendOnEveryPath) { continue; }\n const extendList = selectorPath[selectorPath.length - 1].extendList;\n if (extendList && extendList.length) { continue; }\n\n matches = this.findMatch(allExtends[extendIndex], selectorPath);\n\n if (matches.length) {\n allExtends[extendIndex].hasFoundMatches = true;\n\n allExtends[extendIndex].selfSelectors.forEach(function(selfSelector) {\n let extendedSelectors;\n extendedSelectors = extendVisitor.extendSelector(matches, selectorPath, selfSelector, allExtends[extendIndex].isVisible());\n selectorsToAdd.push(extendedSelectors);\n });\n }\n }\n }\n rulesetNode.paths = rulesetNode.paths.concat(selectorsToAdd);\n }\n\n findMatch(extend, haystackSelectorPath) {\n //\n // look through the haystack selector path to try and find the needle - extend.selector\n // returns an array of selector matches that can then be replaced\n //\n let haystackSelectorIndex;\n\n let hackstackSelector;\n let hackstackElementIndex;\n let haystackElement;\n let targetCombinator;\n let i;\n const extendVisitor = this;\n const needleElements = extend.selector.elements;\n const potentialMatches = [];\n let potentialMatch;\n const matches = [];\n\n // loop through the haystack elements\n for (haystackSelectorIndex = 0; haystackSelectorIndex < haystackSelectorPath.length; haystackSelectorIndex++) {\n hackstackSelector = haystackSelectorPath[haystackSelectorIndex];\n\n for (hackstackElementIndex = 0; hackstackElementIndex < hackstackSelector.elements.length; hackstackElementIndex++) {\n\n haystackElement = hackstackSelector.elements[hackstackElementIndex];\n\n // if we allow elements before our match we can add a potential match every time. otherwise only at the first element.\n if (extend.allowBefore || (haystackSelectorIndex === 0 && hackstackElementIndex === 0)) {\n potentialMatches.push({pathIndex: haystackSelectorIndex, index: hackstackElementIndex, matched: 0,\n initialCombinator: haystackElement.combinator});\n }\n\n for (i = 0; i < potentialMatches.length; i++) {\n potentialMatch = potentialMatches[i];\n\n // selectors add \" \" onto the first element. When we use & it joins the selectors together, but if we don't\n // then each selector in haystackSelectorPath has a space before it added in the toCSS phase. so we need to\n // work out what the resulting combinator will be\n targetCombinator = haystackElement.combinator.value;\n if (targetCombinator === '' && hackstackElementIndex === 0) {\n targetCombinator = ' ';\n }\n\n // if we don't match, null our match to indicate failure\n if (!extendVisitor.isElementValuesEqual(needleElements[potentialMatch.matched].value, haystackElement.value) ||\n (potentialMatch.matched > 0 && needleElements[potentialMatch.matched].combinator.value !== targetCombinator)) {\n potentialMatch = null;\n } else {\n potentialMatch.matched++;\n }\n\n // if we are still valid and have finished, test whether we have elements after and whether these are allowed\n if (potentialMatch) {\n potentialMatch.finished = potentialMatch.matched === needleElements.length;\n if (potentialMatch.finished &&\n (!extend.allowAfter &&\n (hackstackElementIndex + 1 < hackstackSelector.elements.length || haystackSelectorIndex + 1 < haystackSelectorPath.length))) {\n potentialMatch = null;\n }\n }\n // if null we remove, if not, we are still valid, so either push as a valid match or continue\n if (potentialMatch) {\n if (potentialMatch.finished) {\n potentialMatch.length = needleElements.length;\n potentialMatch.endPathIndex = haystackSelectorIndex;\n potentialMatch.endPathElementIndex = hackstackElementIndex + 1; // index after end of match\n potentialMatches.length = 0; // we don't allow matches to overlap, so start matching again\n matches.push(potentialMatch);\n }\n } else {\n potentialMatches.splice(i, 1);\n i--;\n }\n }\n }\n }\n return matches;\n }\n\n isElementValuesEqual(elementValue1, elementValue2) {\n if (typeof elementValue1 === 'string' || typeof elementValue2 === 'string') {\n return elementValue1 === elementValue2;\n }\n if (elementValue1 instanceof tree.Attribute) {\n if (elementValue1.op !== elementValue2.op || elementValue1.key !== elementValue2.key) {\n return false;\n }\n if (!elementValue1.value || !elementValue2.value) {\n if (elementValue1.value || elementValue2.value) {\n return false;\n }\n return true;\n }\n elementValue1 = elementValue1.value.value || elementValue1.value;\n elementValue2 = elementValue2.value.value || elementValue2.value;\n return elementValue1 === elementValue2;\n }\n elementValue1 = elementValue1.value;\n elementValue2 = elementValue2.value;\n if (elementValue1 instanceof tree.Selector) {\n if (!(elementValue2 instanceof tree.Selector) || elementValue1.elements.length !== elementValue2.elements.length) {\n return false;\n }\n for (let i = 0; i < elementValue1.elements.length; i++) {\n if (elementValue1.elements[i].combinator.value !== elementValue2.elements[i].combinator.value) {\n if (i !== 0 || (elementValue1.elements[i].combinator.value || ' ') !== (elementValue2.elements[i].combinator.value || ' ')) {\n return false;\n }\n }\n if (!this.isElementValuesEqual(elementValue1.elements[i].value, elementValue2.elements[i].value)) {\n return false;\n }\n }\n return true;\n }\n return false;\n }\n\n extendSelector(matches, selectorPath, replacementSelector, isVisible) {\n\n // for a set of matches, replace each match with the replacement selector\n\n let currentSelectorPathIndex = 0, currentSelectorPathElementIndex = 0, path = [], matchIndex, selector, firstElement, match, newElements;\n\n for (matchIndex = 0; matchIndex < matches.length; matchIndex++) {\n match = matches[matchIndex];\n selector = selectorPath[match.pathIndex];\n firstElement = new tree.Element(\n match.initialCombinator,\n replacementSelector.elements[0].value,\n replacementSelector.elements[0].isVariable,\n replacementSelector.elements[0].getIndex(),\n replacementSelector.elements[0].fileInfo()\n );\n\n if (match.pathIndex > currentSelectorPathIndex && currentSelectorPathElementIndex > 0) {\n path[path.length - 1].elements = path[path.length - 1]\n .elements.concat(selectorPath[currentSelectorPathIndex].elements.slice(currentSelectorPathElementIndex));\n currentSelectorPathElementIndex = 0;\n currentSelectorPathIndex++;\n }\n\n newElements = selector.elements\n .slice(currentSelectorPathElementIndex, match.index)\n .concat([firstElement])\n .concat(replacementSelector.elements.slice(1));\n\n if (currentSelectorPathIndex === match.pathIndex && matchIndex > 0) {\n path[path.length - 1].elements =\n path[path.length - 1].elements.concat(newElements);\n } else {\n path = path.concat(selectorPath.slice(currentSelectorPathIndex, match.pathIndex));\n\n path.push(new tree.Selector(\n newElements\n ));\n }\n currentSelectorPathIndex = match.endPathIndex;\n currentSelectorPathElementIndex = match.endPathElementIndex;\n if (currentSelectorPathElementIndex >= selectorPath[currentSelectorPathIndex].elements.length) {\n currentSelectorPathElementIndex = 0;\n currentSelectorPathIndex++;\n }\n }\n\n if (currentSelectorPathIndex < selectorPath.length && currentSelectorPathElementIndex > 0) {\n path[path.length - 1].elements = path[path.length - 1]\n .elements.concat(selectorPath[currentSelectorPathIndex].elements.slice(currentSelectorPathElementIndex));\n currentSelectorPathIndex++;\n }\n\n path = path.concat(selectorPath.slice(currentSelectorPathIndex, selectorPath.length));\n path = path.map(function (currentValue) {\n // we can re-use elements here, because the visibility property matters only for selectors\n const derived = currentValue.createDerived(currentValue.elements);\n if (isVisible) {\n derived.ensureVisibility();\n } else {\n derived.ensureInvisibility();\n }\n return derived;\n });\n return path;\n }\n\n visitMedia(mediaNode, visitArgs) {\n let newAllExtends = mediaNode.allExtends.concat(this.allExtendsStack[this.allExtendsStack.length - 1]);\n newAllExtends = newAllExtends.concat(this.doExtendChaining(newAllExtends, mediaNode.allExtends));\n this.allExtendsStack.push(newAllExtends);\n }\n\n visitMediaOut(mediaNode) {\n const lastIndex = this.allExtendsStack.length - 1;\n this.allExtendsStack.length = lastIndex;\n }\n\n visitAtRule(atRuleNode, visitArgs) {\n let newAllExtends = atRuleNode.allExtends.concat(this.allExtendsStack[this.allExtendsStack.length - 1]);\n newAllExtends = newAllExtends.concat(this.doExtendChaining(newAllExtends, atRuleNode.allExtends));\n this.allExtendsStack.push(newAllExtends);\n }\n\n visitAtRuleOut(atRuleNode) {\n const lastIndex = this.allExtendsStack.length - 1;\n this.allExtendsStack.length = lastIndex;\n }\n}\n\nexport default ProcessExtendsVisitor;\n"]} |