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Ruleset from './ruleset';\nimport Value from './value';\nimport Selector from './selector';\nimport Anonymous from './anonymous';\nimport Expression from './expression';\nimport * as utils from '../utils';\n\nconst NestableAtRulePrototype = {\n\n    isRulesetLike() {\n        return true;\n    },\n\n    accept(visitor) {\n        if (this.features) {\n            this.features = visitor.visit(this.features);\n        }\n        if (this.rules) {\n            this.rules = visitor.visitArray(this.rules);\n        }\n    },\n\n    evalFunction: function () {\n        if (!this.features || !Array.isArray(this.features.value) || this.features.value.length < 1) {\n            return;\n        }\n\n        const exprValues = this.features.value;\n        let expr, paren;\n\n        for (let index = 0; index < exprValues.length; ++index) {\n            expr = exprValues[index];\n\n            if (expr.type === 'Keyword' && index + 1 < exprValues.length && (expr.noSpacing || expr.noSpacing == null)) {\n                paren =  exprValues[index + 1];\n                \n                if (paren.type ===  'Paren' && paren.noSpacing) {\n                    exprValues[index]= new Expression([expr, paren]);\n                    exprValues.splice(index + 1, 1);\n                    exprValues[index].noSpacing = true;\n                }\n            }\n        }\n    },\n\n    evalTop(context) {\n        this.evalFunction();\n\n        let result = this;\n\n        // Render all dependent Media blocks.\n        if (context.mediaBlocks.length > 1) {\n            const selectors = (new Selector([], null, null, this.getIndex(), this.fileInfo())).createEmptySelectors();\n            result = new Ruleset(selectors, context.mediaBlocks);\n            result.multiMedia = true;\n            result.copyVisibilityInfo(this.visibilityInfo());\n            this.setParent(result, this);\n        }\n\n        delete context.mediaBlocks;\n        delete context.mediaPath;\n\n        return result;\n    },\n\n    evalNested(context) {\n        this.evalFunction();\n\n        let i;\n        let value;\n        const path = context.mediaPath.concat([this]);\n\n        // Extract the media-query conditions separated with `,` (OR).\n        for (i = 0; i < path.length; i++) {\n            if (path[i].type !== this.type) { \n                context.mediaBlocks.splice(i, 1); \n                \n                return this; \n            }\n            \n            value = path[i].features instanceof Value ?\n                path[i].features.value : path[i].features;\n            path[i] = Array.isArray(value) ? value : [value];\n        }\n\n        // Trace all permutations to generate the resulting media-query.\n        //\n        // (a, b and c) with nested (d, e) ->\n        //    a and d\n        //    a and e\n        //    b and c and d\n        //    b and c and e\n        this.features = new Value(this.permute(path).map(path => {\n            path = path.map(fragment => fragment.toCSS ? fragment : new Anonymous(fragment));\n\n            for (i = path.length - 1; i > 0; i--) {\n                path.splice(i, 0, new Anonymous('and'));\n            }\n\n            return new Expression(path);\n        }));\n        this.setParent(this.features, this);\n\n        // Fake a tree-node that doesn't output anything.\n        return new Ruleset([], []);\n    },\n\n    permute(arr) {\n        if (arr.length === 0) {\n            return [];\n        } else if (arr.length === 1) {\n            return arr[0];\n        } else {\n            const result = [];\n            const rest = this.permute(arr.slice(1));\n            for (let i = 0; i < rest.length; i++) {\n                for (let j = 0; j < arr[0].length; j++) {\n                    result.push([arr[0][j]].concat(rest[i]));\n                }\n            }\n            return result;\n        }\n    },\n\n    bubbleSelectors(selectors) {\n        if (!selectors) {\n            return;\n        }\n        this.rules = [new Ruleset(utils.copyArray(selectors), [this.rules[0]])];\n        this.setParent(this.rules, this);\n    }\n};\n\nexport default NestableAtRulePrototype;\n"]}