1  var baseSetData = require('./_baseSetData'),
  2      createBind = require('./_createBind'),
  3      createCurry = require('./_createCurry'),
  4      createHybrid = require('./_createHybrid'),
  5      createPartial = require('./_createPartial'),
  6      getData = require('./_getData'),
  7      mergeData = require('./_mergeData'),
  8      setData = require('./_setData'),
  9      setWrapToString = require('./_setWrapToString'),
 10      toInteger = require('./toInteger');
 11  
 12  /** Error message constants. */
 13  var FUNC_ERROR_TEXT = 'Expected a function';
 14  
 15  /** Used to compose bitmasks for function metadata. */
 16  var WRAP_BIND_FLAG = 1,
 17      WRAP_BIND_KEY_FLAG = 2,
 18      WRAP_CURRY_FLAG = 8,
 19      WRAP_CURRY_RIGHT_FLAG = 16,
 20      WRAP_PARTIAL_FLAG = 32,
 21      WRAP_PARTIAL_RIGHT_FLAG = 64;
 22  
 23  /* Built-in method references for those with the same name as other `lodash` methods. */
 24  var nativeMax = Math.max;
 25  
 26  /**
 27   * Creates a function that either curries or invokes `func` with optional
 28   * `this` binding and partially applied arguments.
 29   *
 30   * @private
 31   * @param {Function|string} func The function or method name to wrap.
 32   * @param {number} bitmask The bitmask flags.
 33   *    1 - `_.bind`
 34   *    2 - `_.bindKey`
 35   *    4 - `_.curry` or `_.curryRight` of a bound function
 36   *    8 - `_.curry`
 37   *   16 - `_.curryRight`
 38   *   32 - `_.partial`
 39   *   64 - `_.partialRight`
 40   *  128 - `_.rearg`
 41   *  256 - `_.ary`
 42   *  512 - `_.flip`
 43   * @param {*} [thisArg] The `this` binding of `func`.
 44   * @param {Array} [partials] The arguments to be partially applied.
 45   * @param {Array} [holders] The `partials` placeholder indexes.
 46   * @param {Array} [argPos] The argument positions of the new function.
 47   * @param {number} [ary] The arity cap of `func`.
 48   * @param {number} [arity] The arity of `func`.
 49   * @returns {Function} Returns the new wrapped function.
 50   */
 51  function createWrap(func, bitmask, thisArg, partials, holders, argPos, ary, arity) {
 52    var isBindKey = bitmask & WRAP_BIND_KEY_FLAG;
 53    if (!isBindKey && typeof func != 'function') {
 54      throw new TypeError(FUNC_ERROR_TEXT);
 55    }
 56    var length = partials ? partials.length : 0;
 57    if (!length) {
 58      bitmask &= ~(WRAP_PARTIAL_FLAG | WRAP_PARTIAL_RIGHT_FLAG);
 59      partials = holders = undefined;
 60    }
 61    ary = ary === undefined ? ary : nativeMax(toInteger(ary), 0);
 62    arity = arity === undefined ? arity : toInteger(arity);
 63    length -= holders ? holders.length : 0;
 64  
 65    if (bitmask & WRAP_PARTIAL_RIGHT_FLAG) {
 66      var partialsRight = partials,
 67          holdersRight = holders;
 68  
 69      partials = holders = undefined;
 70    }
 71    var data = isBindKey ? undefined : getData(func);
 72  
 73    var newData = [
 74      func, bitmask, thisArg, partials, holders, partialsRight, holdersRight,
 75      argPos, ary, arity
 76    ];
 77  
 78    if (data) {
 79      mergeData(newData, data);
 80    }
 81    func = newData[0];
 82    bitmask = newData[1];
 83    thisArg = newData[2];
 84    partials = newData[3];
 85    holders = newData[4];
 86    arity = newData[9] = newData[9] === undefined
 87      ? (isBindKey ? 0 : func.length)
 88      : nativeMax(newData[9] - length, 0);
 89  
 90    if (!arity && bitmask & (WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG)) {
 91      bitmask &= ~(WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG);
 92    }
 93    if (!bitmask || bitmask == WRAP_BIND_FLAG) {
 94      var result = createBind(func, bitmask, thisArg);
 95    } else if (bitmask == WRAP_CURRY_FLAG || bitmask == WRAP_CURRY_RIGHT_FLAG) {
 96      result = createCurry(func, bitmask, arity);
 97    } else if ((bitmask == WRAP_PARTIAL_FLAG || bitmask == (WRAP_BIND_FLAG | WRAP_PARTIAL_FLAG)) && !holders.length) {
 98      result = createPartial(func, bitmask, thisArg, partials);
 99    } else {
100      result = createHybrid.apply(undefined, newData);
101    }
102    var setter = data ? baseSetData : setData;
103    return setWrapToString(setter(result, newData), func, bitmask);
104  }
105  
106  module.exports = createWrap;