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* @copyright 2017 Alex Regan\n * @license MIT\n * @see https://github.com/alexsasharegan/vue-functional-data-merge\n */\n/* eslint-disable max-statements */\nimport { VNodeData } from 'vue'\nimport { camelize, wrapInArray } from './helpers'\n\nconst pattern = {\n  styleList: /;(?![^(]*\\))/g,\n  styleProp: /:(.*)/,\n} as const\n\nfunction parseStyle (style: string) {\n  const styleMap: Dictionary<any> = {}\n\n  for (const s of style.split(pattern.styleList)) {\n    let [key, val] = s.split(pattern.styleProp)\n    key = key.trim()\n    if (!key) {\n      continue\n    }\n    // May be undefined if the `key: value` pair is incomplete.\n    if (typeof val === 'string') {\n      val = val.trim()\n    }\n    styleMap[camelize(key)] = val\n  }\n\n  return styleMap\n}\n\n/**\n * Intelligently merges data for createElement.\n * Merges arguments left to right, preferring the right argument.\n * Returns new VNodeData object.\n */\nexport default function mergeData (...vNodeData: VNodeData[]): VNodeData\nexport default function mergeData (): VNodeData {\n  const mergeTarget: VNodeData & Dictionary<any> = {}\n  let i: number = arguments.length\n  let prop: string\n\n  // Allow for variadic argument length.\n  while (i--) {\n    // Iterate through the data properties and execute merge strategies\n    // Object.keys eliminates need for hasOwnProperty call\n    for (prop of Object.keys(arguments[i])) {\n      switch (prop) {\n        // Array merge strategy (array concatenation)\n        case 'class':\n        case 'directives':\n          if (arguments[i][prop]) {\n            mergeTarget[prop] = mergeClasses(mergeTarget[prop], arguments[i][prop])\n          }\n          break\n        case 'style':\n          if (arguments[i][prop]) {\n            mergeTarget[prop] = mergeStyles(mergeTarget[prop], arguments[i][prop])\n          }\n          break\n        // Space delimited string concatenation strategy\n        case 'staticClass':\n          if (!arguments[i][prop]) {\n            break\n          }\n          if (mergeTarget[prop] === undefined) {\n            mergeTarget[prop] = ''\n          }\n          if (mergeTarget[prop]) {\n            // Not an empty string, so concatenate\n            mergeTarget[prop] += ' '\n          }\n          mergeTarget[prop] += arguments[i][prop].trim()\n          break\n        // Object, the properties of which to merge via array merge strategy (array concatenation).\n        // Callback merge strategy merges callbacks to the beginning of the array,\n        // so that the last defined callback will be invoked first.\n        // This is done since to mimic how Object.assign merging\n        // uses the last given value to assign.\n        case 'on':\n        case 'nativeOn':\n          if (arguments[i][prop]) {\n            mergeTarget[prop] = mergeListeners(mergeTarget[prop], arguments[i][prop])\n          }\n          break\n        // Object merge strategy\n        case 'attrs':\n        case 'props':\n        case 'domProps':\n        case 'scopedSlots':\n        case 'staticStyle':\n        case 'hook':\n        case 'transition':\n          if (!arguments[i][prop]) {\n            break\n          }\n          if (!mergeTarget[prop]) {\n            mergeTarget[prop] = {}\n          }\n          mergeTarget[prop] = { ...arguments[i][prop], ...mergeTarget[prop] }\n          break\n        // Reassignment strategy (no merge)\n        default: // slot, key, ref, tag, show, keepAlive\n          if (!mergeTarget[prop]) {\n            mergeTarget[prop] = arguments[i][prop]\n          }\n      }\n    }\n  }\n\n  return mergeTarget\n}\n\nexport function mergeStyles (\n  target: undefined | string | object[] | object,\n  source: undefined | string | object[] | object\n) {\n  if (!target) return source\n  if (!source) return target\n\n  target = wrapInArray(typeof target === 'string' ? parseStyle(target) : target)\n\n  return (target as object[]).concat(typeof source === 'string' ? parseStyle(source) : source)\n}\n\nexport function mergeClasses (target: any, source: any) {\n  if (!source) return target\n  if (!target) return source\n\n  return target ? wrapInArray(target).concat(source) : source\n}\n\nexport function mergeListeners (...args: [\n  { [key: string]: Function | Function[] } | undefined,\n  { [key: string]: Function | Function[] } | undefined\n]) {\n  if (!args[0]) return args[1]\n  if (!args[1]) return args[0]\n\n  const dest: { [key: string]: Function | Function[] } = {}\n\n  for (let i = 2; i--;) {\n    const arg = args[i]\n    for (const event in arg) {\n      if (!arg[event]) continue\n\n      if (dest[event]) {\n        // Merge current listeners before (because we are iterating backwards).\n        // Note that neither \"target\" or \"source\" must be altered.\n        dest[event] = ([] as Function[]).concat(arg[event], dest[event])\n      } else {\n        // Straight assign.\n        dest[event] = arg[event]\n      }\n    }\n  }\n\n  return dest\n}\n"],"sourceRoot":"","file":"mergeData.js"}