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tree from '../tree';\n\nconst _visitArgs = { visitDeeper: true };\nlet _hasIndexed = false;\n\nfunction _noop(node) {\n return node;\n}\n\nfunction indexNodeTypes(parent, ticker) {\n // add .typeIndex to tree node types for lookup table\n let key, child;\n for (key in parent) { \n /* eslint guard-for-in: 0 */\n child = parent[key];\n switch (typeof child) {\n case 'function':\n // ignore bound functions directly on tree which do not have a prototype\n // or aren't nodes\n if (child.prototype && child.prototype.type) {\n child.prototype.typeIndex = ticker++;\n }\n break;\n case 'object':\n ticker = indexNodeTypes(child, ticker);\n break;\n \n }\n }\n return ticker;\n}\n\nclass Visitor {\n constructor(implementation) {\n this._implementation = implementation;\n this._visitInCache = {};\n this._visitOutCache = {};\n\n if (!_hasIndexed) {\n indexNodeTypes(tree, 1);\n _hasIndexed = true;\n }\n }\n\n visit(node) {\n if (!node) {\n return node;\n }\n\n const nodeTypeIndex = node.typeIndex;\n if (!nodeTypeIndex) {\n // MixinCall args aren't a node type?\n if (node.value && node.value.typeIndex) {\n this.visit(node.value);\n }\n return node;\n }\n\n const impl = this._implementation;\n let func = this._visitInCache[nodeTypeIndex];\n let funcOut = this._visitOutCache[nodeTypeIndex];\n const visitArgs = _visitArgs;\n let fnName;\n\n visitArgs.visitDeeper = true;\n\n if (!func) {\n fnName = `visit${node.type}`;\n func = impl[fnName] || _noop;\n funcOut = impl[`${fnName}Out`] || _noop;\n this._visitInCache[nodeTypeIndex] = func;\n this._visitOutCache[nodeTypeIndex] = funcOut;\n }\n\n if (func !== _noop) {\n const newNode = func.call(impl, node, visitArgs);\n if (node && impl.isReplacing) {\n node = newNode;\n }\n }\n\n if (visitArgs.visitDeeper && node) {\n if (node.length) {\n for (let i = 0, cnt = node.length; i < cnt; i++) {\n if (node[i].accept) {\n node[i].accept(this);\n }\n }\n } else if (node.accept) {\n node.accept(this);\n }\n }\n\n if (funcOut != _noop) {\n funcOut.call(impl, node);\n }\n\n return node;\n }\n\n visitArray(nodes, nonReplacing) {\n if (!nodes) {\n return nodes;\n }\n\n const cnt = nodes.length;\n let i;\n\n // Non-replacing\n if (nonReplacing || !this._implementation.isReplacing) {\n for (i = 0; i < cnt; i++) {\n this.visit(nodes[i]);\n }\n return nodes;\n }\n\n // Replacing\n const out = [];\n for (i = 0; i < cnt; i++) {\n const evald = this.visit(nodes[i]);\n if (evald === undefined) { continue; }\n if (!evald.splice) {\n out.push(evald);\n } else if (evald.length) {\n this.flatten(evald, out);\n }\n }\n return out;\n }\n\n flatten(arr, out) {\n if (!out) {\n out = [];\n }\n\n let cnt, i, item, nestedCnt, j, nestedItem;\n\n for (i = 0, cnt = arr.length; i < cnt; i++) {\n item = arr[i];\n if (item === undefined) {\n continue;\n }\n if (!item.splice) {\n out.push(item);\n continue;\n }\n\n for (j = 0, nestedCnt = item.length; j < nestedCnt; j++) {\n nestedItem = item[j];\n if (nestedItem === undefined) {\n continue;\n }\n if (!nestedItem.splice) {\n out.push(nestedItem);\n } else if (nestedItem.length) {\n this.flatten(nestedItem, out);\n }\n }\n }\n\n return out;\n }\n}\n\nexport default Visitor;\n"]} |