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_createWrap.js
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 
13 var FUNC_ERROR_TEXT = 'Expected a function';
14 
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 
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;