| 1 | 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tree from '../tree';\nimport Visitor from './visitor';\n\nclass CSSVisitorUtils {\n constructor(context) {\n this._visitor = new Visitor(this);\n this._context = context;\n }\n\n containsSilentNonBlockedChild(bodyRules) {\n let rule;\n if (!bodyRules) {\n return false;\n }\n for (let r = 0; r < bodyRules.length; r++) {\n rule = bodyRules[r];\n if (rule.isSilent && rule.isSilent(this._context) && !rule.blocksVisibility()) {\n // the atrule contains something that was referenced (likely by extend)\n // therefore it needs to be shown in output too\n return true;\n }\n }\n return false;\n }\n\n keepOnlyVisibleChilds(owner) {\n if (owner && owner.rules) {\n owner.rules = owner.rules.filter(thing => thing.isVisible());\n }\n }\n\n isEmpty(owner) {\n return (owner && owner.rules) \n ? (owner.rules.length === 0) : true;\n }\n\n hasVisibleSelector(rulesetNode) {\n return (rulesetNode && rulesetNode.paths)\n ? (rulesetNode.paths.length > 0) : false;\n }\n\n resolveVisibility(node, originalRules) {\n if (!node.blocksVisibility()) {\n if (this.isEmpty(node) && !this.containsSilentNonBlockedChild(originalRules)) {\n return ;\n }\n\n return node;\n }\n\n const compiledRulesBody = node.rules[0];\n this.keepOnlyVisibleChilds(compiledRulesBody);\n\n if (this.isEmpty(compiledRulesBody)) {\n return ;\n }\n\n node.ensureVisibility();\n node.removeVisibilityBlock();\n\n return node;\n }\n\n isVisibleRuleset(rulesetNode) {\n if (rulesetNode.firstRoot) {\n return true;\n }\n\n if (this.isEmpty(rulesetNode)) {\n return false;\n }\n\n if (!rulesetNode.root && !this.hasVisibleSelector(rulesetNode)) {\n return false;\n }\n\n return true;\n }\n}\n\nconst ToCSSVisitor = function(context) {\n this._visitor = new Visitor(this);\n this._context = context;\n this.utils = new CSSVisitorUtils(context);\n};\n\nToCSSVisitor.prototype = {\n isReplacing: true,\n run: function (root) {\n return this._visitor.visit(root);\n },\n\n visitDeclaration: function (declNode, visitArgs) {\n if (declNode.blocksVisibility() || declNode.variable) {\n return;\n }\n return declNode;\n },\n\n visitMixinDefinition: function (mixinNode, visitArgs) {\n // mixin definitions do not get eval'd - this means they keep state\n // so we have to clear that state here so it isn't used if toCSS is called twice\n mixinNode.frames = [];\n },\n\n visitExtend: function (extendNode, visitArgs) {\n },\n\n visitComment: function (commentNode, visitArgs) {\n if (commentNode.blocksVisibility() || commentNode.isSilent(this._context)) {\n return;\n }\n return commentNode;\n },\n\n visitMedia: function(mediaNode, visitArgs) {\n const originalRules = mediaNode.rules[0].rules;\n mediaNode.accept(this._visitor);\n visitArgs.visitDeeper = false;\n\n return this.utils.resolveVisibility(mediaNode, originalRules);\n },\n\n visitImport: function (importNode, visitArgs) {\n if (importNode.blocksVisibility()) {\n return ;\n }\n return importNode;\n },\n\n visitAtRule: function(atRuleNode, visitArgs) {\n if (atRuleNode.rules && atRuleNode.rules.length) {\n return this.visitAtRuleWithBody(atRuleNode, visitArgs);\n } else {\n return this.visitAtRuleWithoutBody(atRuleNode, visitArgs);\n }\n },\n\n visitAnonymous: function(anonymousNode, visitArgs) {\n if (!anonymousNode.blocksVisibility()) {\n anonymousNode.accept(this._visitor);\n return anonymousNode;\n }\n },\n\n visitAtRuleWithBody: function(atRuleNode, visitArgs) {\n // if there is only one nested ruleset and that one has no path, then it is\n // just fake ruleset\n function hasFakeRuleset(atRuleNode) {\n const bodyRules = atRuleNode.rules;\n return bodyRules.length === 1 && (!bodyRules[0].paths || bodyRules[0].paths.length === 0);\n }\n function getBodyRules(atRuleNode) {\n const nodeRules = atRuleNode.rules;\n if (hasFakeRuleset(atRuleNode)) {\n return nodeRules[0].rules;\n }\n\n return nodeRules;\n }\n // it is still true that it is only one ruleset in array\n // this is last such moment\n // process childs\n const originalRules = getBodyRules(atRuleNode);\n atRuleNode.accept(this._visitor);\n visitArgs.visitDeeper = false;\n\n if (!this.utils.isEmpty(atRuleNode)) {\n this._mergeRules(atRuleNode.rules[0].rules);\n }\n\n return this.utils.resolveVisibility(atRuleNode, originalRules);\n },\n\n visitAtRuleWithoutBody: function(atRuleNode, visitArgs) {\n if (atRuleNode.blocksVisibility()) {\n return;\n }\n\n if (atRuleNode.name === '@charset') {\n // Only output the debug info together with subsequent @charset definitions\n // a comment (or @media statement) before the actual @charset atrule would\n // be considered illegal css as it has to be on the first line\n if (this.charset) {\n if (atRuleNode.debugInfo) {\n const comment = new tree.Comment(`/* ${atRuleNode.toCSS(this._context).replace(/\\n/g, '')} */\\n`);\n comment.debugInfo = atRuleNode.debugInfo;\n return this._visitor.visit(comment);\n }\n return;\n }\n this.charset = true;\n }\n\n return atRuleNode;\n },\n\n checkValidNodes: function(rules, isRoot) {\n if (!rules) {\n return;\n }\n\n for (let i = 0; i < rules.length; i++) {\n const ruleNode = rules[i];\n if (isRoot && ruleNode instanceof tree.Declaration && !ruleNode.variable) {\n throw { message: 'Properties must be inside selector blocks. They cannot be in the root',\n index: ruleNode.getIndex(), filename: ruleNode.fileInfo() && ruleNode.fileInfo().filename};\n }\n if (ruleNode instanceof tree.Call) {\n throw { message: `Function '${ruleNode.name}' did not return a root node`,\n index: ruleNode.getIndex(), filename: ruleNode.fileInfo() && ruleNode.fileInfo().filename};\n }\n if (ruleNode.type && !ruleNode.allowRoot) {\n throw { message: `${ruleNode.type} node returned by a function is not valid here`,\n index: ruleNode.getIndex(), filename: ruleNode.fileInfo() && ruleNode.fileInfo().filename};\n }\n }\n },\n\n visitRuleset: function (rulesetNode, visitArgs) {\n // at this point rulesets are nested into each other\n let rule;\n\n const rulesets = [];\n\n this.checkValidNodes(rulesetNode.rules, rulesetNode.firstRoot);\n\n if (!rulesetNode.root) {\n // remove invisible paths\n this._compileRulesetPaths(rulesetNode);\n\n // remove rulesets from this ruleset body and compile them separately\n const nodeRules = rulesetNode.rules;\n\n let nodeRuleCnt = nodeRules ? nodeRules.length : 0;\n for (let i = 0; i < nodeRuleCnt; ) {\n rule = nodeRules[i];\n if (rule && rule.rules) {\n // visit because we are moving them out from being a child\n rulesets.push(this._visitor.visit(rule));\n nodeRules.splice(i, 1);\n nodeRuleCnt--;\n continue;\n }\n i++;\n }\n // accept the visitor to remove rules and refactor itself\n // then we can decide nogw whether we want it or not\n // compile body\n if (nodeRuleCnt > 0) {\n rulesetNode.accept(this._visitor);\n } else {\n rulesetNode.rules = null;\n }\n visitArgs.visitDeeper = false;\n } else { // if (! rulesetNode.root) {\n rulesetNode.accept(this._visitor);\n visitArgs.visitDeeper = false;\n }\n\n if (rulesetNode.rules) {\n this._mergeRules(rulesetNode.rules);\n this._removeDuplicateRules(rulesetNode.rules);\n }\n\n // now decide whether we keep the ruleset\n if (this.utils.isVisibleRuleset(rulesetNode)) {\n rulesetNode.ensureVisibility();\n rulesets.splice(0, 0, rulesetNode);\n }\n\n if (rulesets.length === 1) {\n return rulesets[0];\n }\n return rulesets;\n },\n\n _compileRulesetPaths: function(rulesetNode) {\n if (rulesetNode.paths) {\n rulesetNode.paths = rulesetNode.paths\n .filter(p => {\n let i;\n if (p[0].elements[0].combinator.value === ' ') {\n p[0].elements[0].combinator = new(tree.Combinator)('');\n }\n for (i = 0; i < p.length; i++) {\n if (p[i].isVisible() && p[i].getIsOutput()) {\n return true;\n }\n }\n return false;\n });\n }\n },\n\n _removeDuplicateRules: function(rules) {\n if (!rules) { return; }\n\n // remove duplicates\n const ruleCache = {};\n\n let ruleList;\n let rule;\n let i;\n\n for (i = rules.length - 1; i >= 0 ; i--) {\n rule = rules[i];\n if (rule instanceof tree.Declaration) {\n if (!ruleCache[rule.name]) {\n ruleCache[rule.name] = rule;\n } else {\n ruleList = ruleCache[rule.name];\n if (ruleList instanceof tree.Declaration) {\n ruleList = ruleCache[rule.name] = [ruleCache[rule.name].toCSS(this._context)];\n }\n const ruleCSS = rule.toCSS(this._context);\n if (ruleList.indexOf(ruleCSS) !== -1) {\n rules.splice(i, 1);\n } else {\n ruleList.push(ruleCSS);\n }\n }\n }\n }\n },\n\n _mergeRules: function(rules) {\n if (!rules) {\n return; \n }\n\n const groups = {};\n const groupsArr = [];\n\n for (let i = 0; i < rules.length; i++) {\n const rule = rules[i];\n if (rule.merge) {\n const key = rule.name;\n groups[key] ? rules.splice(i--, 1) : \n groupsArr.push(groups[key] = []);\n groups[key].push(rule);\n }\n }\n\n groupsArr.forEach(group => {\n if (group.length > 0) {\n const result = group[0];\n let space = [];\n const comma = [new tree.Expression(space)];\n group.forEach(rule => {\n if ((rule.merge === '+') && (space.length > 0)) {\n comma.push(new tree.Expression(space = []));\n }\n space.push(rule.value);\n result.important = result.important || rule.important;\n });\n result.value = new tree.Value(comma);\n }\n });\n }\n};\n\nexport default ToCSSVisitor;\n"]} |