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Node from './node';\nimport Declaration from './declaration';\nimport Keyword from './keyword';\nimport Comment from './comment';\nimport Paren from './paren';\nimport Selector from './selector';\nimport Element from './element';\nimport Anonymous from './anonymous';\nimport contexts from '../contexts';\nimport globalFunctionRegistry from '../functions/function-registry';\nimport defaultFunc from '../functions/default';\nimport getDebugInfo from './debug-info';\nimport * as utils from '../utils';\n\nconst Ruleset = function(selectors, rules, strictImports, visibilityInfo) {\n    this.selectors = selectors;\n    this.rules = rules;\n    this._lookups = {};\n    this._variables = null;\n    this._properties = null;\n    this.strictImports = strictImports;\n    this.copyVisibilityInfo(visibilityInfo);\n    this.allowRoot = true;\n\n    this.setParent(this.selectors, this);\n    this.setParent(this.rules, this);\n}\n\nRuleset.prototype = Object.assign(new Node(), {\n    type: 'Ruleset',\n    isRuleset: true,\n\n    isRulesetLike() { return true; },\n\n    accept(visitor) {\n        if (this.paths) {\n            this.paths = visitor.visitArray(this.paths, true);\n        } else if (this.selectors) {\n            this.selectors = visitor.visitArray(this.selectors);\n        }\n        if (this.rules && this.rules.length) {\n            this.rules = visitor.visitArray(this.rules);\n        }\n    },\n\n    eval(context) {\n        const that = this;\n        let selectors;\n        let selCnt;\n        let selector;\n        let i;\n        let hasVariable;\n        let hasOnePassingSelector = false;\n\n        if (this.selectors && (selCnt = this.selectors.length)) {\n            selectors = new Array(selCnt);\n            defaultFunc.error({\n                type: 'Syntax',\n                message: 'it is currently only allowed in parametric mixin guards,'\n            });\n\n            for (i = 0; i < selCnt; i++) {\n                selector = this.selectors[i].eval(context);\n                for (var j = 0; j < selector.elements.length; j++) {\n                    if (selector.elements[j].isVariable) {\n                        hasVariable = true;\n                        break;\n                    }\n                }\n                selectors[i] = selector;\n                if (selector.evaldCondition) {\n                    hasOnePassingSelector = true;\n                }\n            }\n\n            if (hasVariable) {\n                const toParseSelectors = new Array(selCnt);\n                for (i = 0; i < selCnt; i++) {\n                    selector = selectors[i];\n                    toParseSelectors[i] = selector.toCSS(context);\n                }\n                this.parse.parseNode(\n                    toParseSelectors.join(','),\n                    [\"selectors\"], \n                    selectors[0].getIndex(), \n                    selectors[0].fileInfo(), \n                    function(err, result) {\n                        if (result) {\n                            selectors = utils.flattenArray(result);\n                        }\n                    });\n            }\n\n            defaultFunc.reset();\n        } else {\n            hasOnePassingSelector = true;\n        }\n\n        let rules = this.rules ? utils.copyArray(this.rules) : null;\n        const ruleset = new Ruleset(selectors, rules, this.strictImports, this.visibilityInfo());\n        let rule;\n        let subRule;\n\n        ruleset.originalRuleset = this;\n        ruleset.root = this.root;\n        ruleset.firstRoot = this.firstRoot;\n        ruleset.allowImports = this.allowImports;\n\n        if (this.debugInfo) {\n            ruleset.debugInfo = this.debugInfo;\n        }\n\n        if (!hasOnePassingSelector) {\n            rules.length = 0;\n        }\n\n        // inherit a function registry from the frames stack when possible;\n        // otherwise from the global registry\n        ruleset.functionRegistry = (function (frames) {\n            let i = 0;\n            const n = frames.length;\n            let found;\n            for ( ; i !== n ; ++i ) {\n                found = frames[ i ].functionRegistry;\n                if ( found ) { return found; }\n            }\n            return globalFunctionRegistry;\n        }(context.frames)).inherit();\n\n        // push the current ruleset to the frames stack\n        const ctxFrames = context.frames;\n        ctxFrames.unshift(ruleset);\n\n        // currrent selectors\n        let ctxSelectors = context.selectors;\n        if (!ctxSelectors) {\n            context.selectors = ctxSelectors = [];\n        }\n        ctxSelectors.unshift(this.selectors);\n\n        // Evaluate imports\n        if (ruleset.root || ruleset.allowImports || !ruleset.strictImports) {\n            ruleset.evalImports(context);\n        }\n\n        // Store the frames around mixin definitions,\n        // so they can be evaluated like closures when the time comes.\n        const rsRules = ruleset.rules;\n        for (i = 0; (rule = rsRules[i]); i++) {\n            if (rule.evalFirst) {\n                rsRules[i] = rule.eval(context);\n            }\n        }\n\n        const mediaBlockCount = (context.mediaBlocks && context.mediaBlocks.length) || 0;\n\n        // Evaluate mixin calls.\n        for (i = 0; (rule = rsRules[i]); i++) {\n            if (rule.type === 'MixinCall') {\n                /* jshint loopfunc:true */\n                rules = rule.eval(context).filter(function(r) {\n                    if ((r instanceof Declaration) && r.variable) {\n                        // do not pollute the scope if the variable is\n                        // already there. consider returning false here\n                        // but we need a way to \"return\" variable from mixins\n                        return !(ruleset.variable(r.name));\n                    }\n                    return true;\n                });\n                rsRules.splice.apply(rsRules, [i, 1].concat(rules));\n                i += rules.length - 1;\n                ruleset.resetCache();\n            } else if (rule.type ===  'VariableCall') {\n                /* jshint loopfunc:true */\n                rules = rule.eval(context).rules.filter(function(r) {\n                    if ((r instanceof Declaration) && r.variable) {\n                        // do not pollute the scope at all\n                        return false;\n                    }\n                    return true;\n                });\n                rsRules.splice.apply(rsRules, [i, 1].concat(rules));\n                i += rules.length - 1;\n                ruleset.resetCache();\n            }\n        }\n\n        // Evaluate everything else\n        for (i = 0; (rule = rsRules[i]); i++) {\n            if (!rule.evalFirst) {\n                rsRules[i] = rule = rule.eval ? rule.eval(context) : rule;\n            }\n        }\n\n        // Evaluate everything else\n        for (i = 0; (rule = rsRules[i]); i++) {\n            // for rulesets, check if it is a css guard and can be removed\n            if (rule instanceof Ruleset && rule.selectors && rule.selectors.length === 1) {\n                // check if it can be folded in (e.g. & where)\n                if (rule.selectors[0] && rule.selectors[0].isJustParentSelector()) {\n                    rsRules.splice(i--, 1);\n\n                    for (var j = 0; (subRule = rule.rules[j]); j++) {\n                        if (subRule instanceof Node) {\n                            subRule.copyVisibilityInfo(rule.visibilityInfo());\n                            if (!(subRule instanceof Declaration) || !subRule.variable) {\n                                rsRules.splice(++i, 0, subRule);\n                            }\n                        }\n                    }\n                }\n            }\n        }\n\n        // Pop the stack\n        ctxFrames.shift();\n        ctxSelectors.shift();\n\n        if (context.mediaBlocks) {\n            for (i = mediaBlockCount; i < context.mediaBlocks.length; i++) {\n                context.mediaBlocks[i].bubbleSelectors(selectors);\n            }\n        }\n\n        return ruleset;\n    },\n\n    evalImports(context) {\n        const rules = this.rules;\n        let i;\n        let importRules;\n        if (!rules) { return; }\n\n        for (i = 0; i < rules.length; i++) {\n            if (rules[i].type === 'Import') {\n                importRules = rules[i].eval(context);\n                if (importRules && (importRules.length || importRules.length === 0)) {\n                    rules.splice.apply(rules, [i, 1].concat(importRules));\n                    i += importRules.length - 1;\n                } else {\n                    rules.splice(i, 1, importRules);\n                }\n                this.resetCache();\n            }\n        }\n    },\n\n    makeImportant() {\n        const result = new Ruleset(this.selectors, this.rules.map(function (r) {\n            if (r.makeImportant) {\n                return r.makeImportant();\n            } else {\n                return r;\n            }\n        }), this.strictImports, this.visibilityInfo());\n\n        return result;\n    },\n\n    matchArgs(args) {\n        return !args || args.length === 0;\n    },\n\n    // lets you call a css selector with a guard\n    matchCondition(args, context) {\n        const lastSelector = this.selectors[this.selectors.length - 1];\n        if (!lastSelector.evaldCondition) {\n            return false;\n        }\n        if (lastSelector.condition &&\n            !lastSelector.condition.eval(\n                new contexts.Eval(context,\n                    context.frames))) {\n            return false;\n        }\n        return true;\n    },\n\n    resetCache() {\n        this._rulesets = null;\n        this._variables = null;\n        this._properties = null;\n        this._lookups = {};\n    },\n\n    variables() {\n        if (!this._variables) {\n            this._variables = !this.rules ? {} : this.rules.reduce(function (hash, r) {\n                if (r instanceof Declaration && r.variable === true) {\n                    hash[r.name] = r;\n                }\n                // when evaluating variables in an import statement, imports have not been eval'd\n                // so we need to go inside import statements.\n                // guard against root being a string (in the case of inlined less)\n                if (r.type === 'Import' && r.root && r.root.variables) {\n                    const vars = r.root.variables();\n                    for (const name in vars) {\n                        if (vars.hasOwnProperty(name)) {\n                            hash[name] = r.root.variable(name);\n                        }\n                    }\n                }\n                return hash;\n            }, {});\n        }\n        return this._variables;\n    },\n\n    properties() {\n        if (!this._properties) {\n            this._properties = !this.rules ? {} : this.rules.reduce(function (hash, r) {\n                if (r instanceof Declaration && r.variable !== true) {\n                    const name = (r.name.length === 1) && (r.name[0] instanceof Keyword) ?\n                        r.name[0].value : r.name;\n                    // Properties don't overwrite as they can merge\n                    if (!hash[`$${name}`]) {\n                        hash[`$${name}`] = [ r ];\n                    }\n                    else {\n                        hash[`$${name}`].push(r);\n                    }\n                }\n                return hash;\n            }, {});\n        }\n        return this._properties;\n    },\n\n    variable(name) {\n        const decl = this.variables()[name];\n        if (decl) {\n            return this.parseValue(decl);\n        }\n    },\n\n    property(name) {\n        const decl = this.properties()[name];\n        if (decl) {\n            return this.parseValue(decl);\n        }\n    },\n\n    lastDeclaration() {\n        for (let i = this.rules.length; i > 0; i--) {\n            const decl = this.rules[i - 1];\n            if (decl instanceof Declaration) {\n                return this.parseValue(decl);\n            }\n        }\n    },\n\n    parseValue(toParse) {\n        const self = this;\n        function transformDeclaration(decl) {\n            if (decl.value instanceof Anonymous && !decl.parsed) {\n                if (typeof decl.value.value === 'string') {\n                    this.parse.parseNode(\n                        decl.value.value,\n                        ['value', 'important'], \n                        decl.value.getIndex(), \n                        decl.fileInfo(), \n                        function(err, result) {\n                            if (err) {\n                                decl.parsed = true;\n                            }\n                            if (result) {\n                                decl.value = result[0];\n                                decl.important = result[1] || '';\n                                decl.parsed = true;\n                            }\n                        });\n                } else {\n                    decl.parsed = true;\n                }\n\n                return decl;\n            }\n            else {\n                return decl;\n            }\n        }\n        if (!Array.isArray(toParse)) {\n            return transformDeclaration.call(self, toParse);\n        }\n        else {\n            const nodes = [];\n            toParse.forEach(function(n) {\n                nodes.push(transformDeclaration.call(self, n));\n            });\n            return nodes;\n        }\n    },\n\n    rulesets() {\n        if (!this.rules) { return []; }\n\n        const filtRules = [];\n        const rules = this.rules;\n        let i;\n        let rule;\n\n        for (i = 0; (rule = rules[i]); i++) {\n            if (rule.isRuleset) {\n                filtRules.push(rule);\n            }\n        }\n\n        return filtRules;\n    },\n\n    prependRule(rule) {\n        const rules = this.rules;\n        if (rules) {\n            rules.unshift(rule);\n        } else {\n            this.rules = [ rule ];\n        }\n        this.setParent(rule, this);\n    },\n\n    find(selector, self, filter) {\n        self = self || this;\n        const rules = [];\n        let match;\n        let foundMixins;\n        const key = selector.toCSS();\n\n        if (key in this._lookups) { return this._lookups[key]; }\n\n        this.rulesets().forEach(function (rule) {\n            if (rule !== self) {\n                for (let j = 0; j < rule.selectors.length; j++) {\n                    match = selector.match(rule.selectors[j]);\n                    if (match) {\n                        if (selector.elements.length > match) {\n                            if (!filter || filter(rule)) {\n                                foundMixins = rule.find(new Selector(selector.elements.slice(match)), self, filter);\n                                for (let i = 0; i < foundMixins.length; ++i) {\n                                    foundMixins[i].path.push(rule);\n                                }\n                                Array.prototype.push.apply(rules, foundMixins);\n                            }\n                        } else {\n                            rules.push({ rule, path: []});\n                        }\n                        break;\n                    }\n                }\n            }\n        });\n        this._lookups[key] = rules;\n        return rules;\n    },\n\n    genCSS(context, output) {\n        let i;\n        let j;\n        const charsetRuleNodes = [];\n        let ruleNodes = [];\n\n        let // Line number debugging\n            debugInfo;\n\n        let rule;\n        let path;\n\n        context.tabLevel = (context.tabLevel || 0);\n\n        if (!this.root) {\n            context.tabLevel++;\n        }\n\n        const tabRuleStr = context.compress ? '' : Array(context.tabLevel + 1).join('  ');\n        const tabSetStr = context.compress ? '' : Array(context.tabLevel).join('  ');\n        let sep;\n\n        let charsetNodeIndex = 0;\n        let importNodeIndex = 0;\n        for (i = 0; (rule = this.rules[i]); i++) {\n            if (rule instanceof Comment) {\n                if (importNodeIndex === i) {\n                    importNodeIndex++;\n                }\n                ruleNodes.push(rule);\n            } else if (rule.isCharset && rule.isCharset()) {\n                ruleNodes.splice(charsetNodeIndex, 0, rule);\n                charsetNodeIndex++;\n                importNodeIndex++;\n            } else if (rule.type === 'Import') {\n                ruleNodes.splice(importNodeIndex, 0, rule);\n                importNodeIndex++;\n            } else {\n                ruleNodes.push(rule);\n            }\n        }\n        ruleNodes = charsetRuleNodes.concat(ruleNodes);\n\n        // If this is the root node, we don't render\n        // a selector, or {}.\n        if (!this.root) {\n            debugInfo = getDebugInfo(context, this, tabSetStr);\n\n            if (debugInfo) {\n                output.add(debugInfo);\n                output.add(tabSetStr);\n            }\n\n            const paths = this.paths;\n            const pathCnt = paths.length;\n            let pathSubCnt;\n\n            sep = context.compress ? ',' : (`,\\n${tabSetStr}`);\n\n            for (i = 0; i < pathCnt; i++) {\n                path = paths[i];\n                if (!(pathSubCnt = path.length)) { continue; }\n                if (i > 0) { output.add(sep); }\n\n                context.firstSelector = true;\n                path[0].genCSS(context, output);\n\n                context.firstSelector = false;\n                for (j = 1; j < pathSubCnt; j++) {\n                    path[j].genCSS(context, output);\n                }\n            }\n\n            output.add((context.compress ? '{' : ' {\\n') + tabRuleStr);\n        }\n\n        // Compile rules and rulesets\n        for (i = 0; (rule = ruleNodes[i]); i++) {\n\n            if (i + 1 === ruleNodes.length) {\n                context.lastRule = true;\n            }\n\n            const currentLastRule = context.lastRule;\n            if (rule.isRulesetLike(rule)) {\n                context.lastRule = false;\n            }\n\n            if (rule.genCSS) {\n                rule.genCSS(context, output);\n            } else if (rule.value) {\n                output.add(rule.value.toString());\n            }\n\n            context.lastRule = currentLastRule;\n\n            if (!context.lastRule && rule.isVisible()) {\n                output.add(context.compress ? '' : (`\\n${tabRuleStr}`));\n            } else {\n                context.lastRule = false;\n            }\n        }\n\n        if (!this.root) {\n            output.add((context.compress ? '}' : `\\n${tabSetStr}}`));\n            context.tabLevel--;\n        }\n\n        if (!output.isEmpty() && !context.compress && this.firstRoot) {\n            output.add('\\n');\n        }\n    },\n\n    joinSelectors(paths, context, selectors) {\n        for (let s = 0; s < selectors.length; s++) {\n            this.joinSelector(paths, context, selectors[s]);\n        }\n    },\n\n    joinSelector(paths, context, selector) {\n\n        function createParenthesis(elementsToPak, originalElement) {\n            let replacementParen, j;\n            if (elementsToPak.length === 0) {\n                replacementParen = new Paren(elementsToPak[0]);\n            } else {\n                const insideParent = new Array(elementsToPak.length);\n                for (j = 0; j < elementsToPak.length; j++) {\n                    insideParent[j] = new Element(\n                        null,\n                        elementsToPak[j],\n                        originalElement.isVariable,\n                        originalElement._index,\n                        originalElement._fileInfo\n                    );\n                }\n                replacementParen = new Paren(new Selector(insideParent));\n            }\n            return replacementParen;\n        }\n\n        function createSelector(containedElement, originalElement) {\n            let element, selector;\n            element = new Element(null, containedElement, originalElement.isVariable, originalElement._index, originalElement._fileInfo);\n            selector = new Selector([element]);\n            return selector;\n        }\n\n        // joins selector path from `beginningPath` with selector path in `addPath`\n        // `replacedElement` contains element that is being replaced by `addPath`\n        // returns concatenated path\n        function addReplacementIntoPath(beginningPath, addPath, replacedElement, originalSelector) {\n            let newSelectorPath, lastSelector, newJoinedSelector;\n            // our new selector path\n            newSelectorPath = [];\n\n            // construct the joined selector - if & is the first thing this will be empty,\n            // if not newJoinedSelector will be the last set of elements in the selector\n            if (beginningPath.length > 0) {\n                newSelectorPath = utils.copyArray(beginningPath);\n                lastSelector = newSelectorPath.pop();\n                newJoinedSelector = originalSelector.createDerived(utils.copyArray(lastSelector.elements));\n            }\n            else {\n                newJoinedSelector = originalSelector.createDerived([]);\n            }\n\n            if (addPath.length > 0) {\n                // /deep/ is a CSS4 selector - (removed, so should deprecate)\n                // that is valid without anything in front of it\n                // so if the & does not have a combinator that is \"\" or \" \" then\n                // and there is a combinator on the parent, then grab that.\n                // this also allows + a { & .b { .a & { ... though not sure why you would want to do that\n                let combinator = replacedElement.combinator;\n\n                const parentEl = addPath[0].elements[0];\n                if (combinator.emptyOrWhitespace && !parentEl.combinator.emptyOrWhitespace) {\n                    combinator = parentEl.combinator;\n                }\n                // join the elements so far with the first part of the parent\n                newJoinedSelector.elements.push(new Element(\n                    combinator,\n                    parentEl.value,\n                    replacedElement.isVariable,\n                    replacedElement._index,\n                    replacedElement._fileInfo\n                ));\n                newJoinedSelector.elements = newJoinedSelector.elements.concat(addPath[0].elements.slice(1));\n            }\n\n            // now add the joined selector - but only if it is not empty\n            if (newJoinedSelector.elements.length !== 0) {\n                newSelectorPath.push(newJoinedSelector);\n            }\n\n            // put together the parent selectors after the join (e.g. the rest of the parent)\n            if (addPath.length > 1) {\n                let restOfPath = addPath.slice(1);\n                restOfPath = restOfPath.map(function (selector) {\n                    return selector.createDerived(selector.elements, []);\n                });\n                newSelectorPath = newSelectorPath.concat(restOfPath);\n            }\n            return newSelectorPath;\n        }\n\n        // joins selector path from `beginningPath` with every selector path in `addPaths` array\n        // `replacedElement` contains element that is being replaced by `addPath`\n        // returns array with all concatenated paths\n        function addAllReplacementsIntoPath( beginningPath, addPaths, replacedElement, originalSelector, result) {\n            let j;\n            for (j = 0; j < beginningPath.length; j++) {\n                const newSelectorPath = addReplacementIntoPath(beginningPath[j], addPaths, replacedElement, originalSelector);\n                result.push(newSelectorPath);\n            }\n            return result;\n        }\n\n        function mergeElementsOnToSelectors(elements, selectors) {\n            let i, sel;\n\n            if (elements.length === 0) {\n                return ;\n            }\n            if (selectors.length === 0) {\n                selectors.push([ new Selector(elements) ]);\n                return;\n            }\n\n            for (i = 0; (sel = selectors[i]); i++) {\n                // if the previous thing in sel is a parent this needs to join on to it\n                if (sel.length > 0) {\n                    sel[sel.length - 1] = sel[sel.length - 1].createDerived(sel[sel.length - 1].elements.concat(elements));\n                }\n                else {\n                    sel.push(new Selector(elements));\n                }\n            }\n        }\n\n        // replace all parent selectors inside `inSelector` by content of `context` array\n        // resulting selectors are returned inside `paths` array\n        // returns true if `inSelector` contained at least one parent selector\n        function replaceParentSelector(paths, context, inSelector) {\n            // The paths are [[Selector]]\n            // The first list is a list of comma separated selectors\n            // The inner list is a list of inheritance separated selectors\n            // e.g.\n            // .a, .b {\n            //   .c {\n            //   }\n            // }\n            // == [[.a] [.c]] [[.b] [.c]]\n            //\n            let i, j, k, currentElements, newSelectors, selectorsMultiplied, sel, el, hadParentSelector = false, length, lastSelector;\n            function findNestedSelector(element) {\n                let maybeSelector;\n                if (!(element.value instanceof Paren)) {\n                    return null;\n                }\n\n                maybeSelector = element.value.value;\n                if (!(maybeSelector instanceof Selector)) {\n                    return null;\n                }\n\n                return maybeSelector;\n            }\n\n            // the elements from the current selector so far\n            currentElements = [];\n            // the current list of new selectors to add to the path.\n            // We will build it up. We initiate it with one empty selector as we \"multiply\" the new selectors\n            // by the parents\n            newSelectors = [\n                []\n            ];\n\n            for (i = 0; (el = inSelector.elements[i]); i++) {\n                // non parent reference elements just get added\n                if (el.value !== '&') {\n                    const nestedSelector = findNestedSelector(el);\n                    if (nestedSelector != null) {\n                        // merge the current list of non parent selector elements\n                        // on to the current list of selectors to add\n                        mergeElementsOnToSelectors(currentElements, newSelectors);\n\n                        const nestedPaths = [];\n                        let replaced;\n                        const replacedNewSelectors = [];\n                        replaced = replaceParentSelector(nestedPaths, context, nestedSelector);\n                        hadParentSelector = hadParentSelector || replaced;\n                        // the nestedPaths array should have only one member - replaceParentSelector does not multiply selectors\n                        for (k = 0; k < nestedPaths.length; k++) {\n                            const replacementSelector = createSelector(createParenthesis(nestedPaths[k], el), el);\n                            addAllReplacementsIntoPath(newSelectors, [replacementSelector], el, inSelector, replacedNewSelectors);\n                        }\n                        newSelectors = replacedNewSelectors;\n                        currentElements = [];\n                    } else {\n                        currentElements.push(el);\n                    }\n\n                } else {\n                    hadParentSelector = true;\n                    // the new list of selectors to add\n                    selectorsMultiplied = [];\n\n                    // merge the current list of non parent selector elements\n                    // on to the current list of selectors to add\n                    mergeElementsOnToSelectors(currentElements, newSelectors);\n\n                    // loop through our current selectors\n                    for (j = 0; j < newSelectors.length; j++) {\n                        sel = newSelectors[j];\n                        // if we don't have any parent paths, the & might be in a mixin so that it can be used\n                        // whether there are parents or not\n                        if (context.length === 0) {\n                            // the combinator used on el should now be applied to the next element instead so that\n                            // it is not lost\n                            if (sel.length > 0) {\n                                sel[0].elements.push(new Element(el.combinator, '', el.isVariable, el._index, el._fileInfo));\n                            }\n                            selectorsMultiplied.push(sel);\n                        }\n                        else {\n                            // and the parent selectors\n                            for (k = 0; k < context.length; k++) {\n                                // We need to put the current selectors\n                                // then join the last selector's elements on to the parents selectors\n                                const newSelectorPath = addReplacementIntoPath(sel, context[k], el, inSelector);\n                                // add that to our new set of selectors\n                                selectorsMultiplied.push(newSelectorPath);\n                            }\n                        }\n                    }\n\n                    // our new selectors has been multiplied, so reset the state\n                    newSelectors = selectorsMultiplied;\n                    currentElements = [];\n                }\n            }\n\n            // if we have any elements left over (e.g. .a& .b == .b)\n            // add them on to all the current selectors\n            mergeElementsOnToSelectors(currentElements, newSelectors);\n\n            for (i = 0; i < newSelectors.length; i++) {\n                length = newSelectors[i].length;\n                if (length > 0) {\n                    paths.push(newSelectors[i]);\n                    lastSelector = newSelectors[i][length - 1];\n                    newSelectors[i][length - 1] = lastSelector.createDerived(lastSelector.elements, inSelector.extendList);\n                }\n            }\n\n            return hadParentSelector;\n        }\n\n        function deriveSelector(visibilityInfo, deriveFrom) {\n            const newSelector = deriveFrom.createDerived(deriveFrom.elements, deriveFrom.extendList, deriveFrom.evaldCondition);\n            newSelector.copyVisibilityInfo(visibilityInfo);\n            return newSelector;\n        }\n\n        // joinSelector code follows\n        let i, newPaths, hadParentSelector;\n\n        newPaths = [];\n        hadParentSelector = replaceParentSelector(newPaths, context, selector);\n\n        if (!hadParentSelector) {\n            if (context.length > 0) {\n                newPaths = [];\n                for (i = 0; i < context.length; i++) {\n\n                    const concatenated = context[i].map(deriveSelector.bind(this, selector.visibilityInfo()));\n\n                    concatenated.push(selector);\n                    newPaths.push(concatenated);\n                }\n            }\n            else {\n                newPaths = [[selector]];\n            }\n        }\n\n        for (i = 0; i < newPaths.length; i++) {\n            paths.push(newPaths[i]);\n        }\n\n    }\n});\n\nexport default Ruleset;\n"]}