artdaq_node_server  v1_00_08
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_mergeData.js
1 var composeArgs = require('./_composeArgs'),
2  composeArgsRight = require('./_composeArgsRight'),
3  replaceHolders = require('./_replaceHolders');
4 
6 var PLACEHOLDER = '__lodash_placeholder__';
7 
9 var WRAP_BIND_FLAG = 1,
10  WRAP_BIND_KEY_FLAG = 2,
11  WRAP_CURRY_BOUND_FLAG = 4,
12  WRAP_CURRY_FLAG = 8,
13  WRAP_ARY_FLAG = 128,
14  WRAP_REARG_FLAG = 256;
15 
16 /* Built-in method references for those with the same name as other `lodash` methods. */
17 var nativeMin = Math.min;
18 
35 function mergeData(data, source) {
36  var bitmask = data[1],
37  srcBitmask = source[1],
38  newBitmask = bitmask | srcBitmask,
39  isCommon = newBitmask < (WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG | WRAP_ARY_FLAG);
40 
41  var isCombo =
42  ((srcBitmask == WRAP_ARY_FLAG) && (bitmask == WRAP_CURRY_FLAG)) ||
43  ((srcBitmask == WRAP_ARY_FLAG) && (bitmask == WRAP_REARG_FLAG) && (data[7].length <= source[8])) ||
44  ((srcBitmask == (WRAP_ARY_FLAG | WRAP_REARG_FLAG)) && (source[7].length <= source[8]) && (bitmask == WRAP_CURRY_FLAG));
45 
46  // Exit early if metadata can't be merged.
47  if (!(isCommon || isCombo)) {
48  return data;
49  }
50  // Use source `thisArg` if available.
51  if (srcBitmask & WRAP_BIND_FLAG) {
52  data[2] = source[2];
53  // Set when currying a bound function.
54  newBitmask |= bitmask & WRAP_BIND_FLAG ? 0 : WRAP_CURRY_BOUND_FLAG;
55  }
56  // Compose partial arguments.
57  var value = source[3];
58  if (value) {
59  var partials = data[3];
60  data[3] = partials ? composeArgs(partials, value, source[4]) : value;
61  data[4] = partials ? replaceHolders(data[3], PLACEHOLDER) : source[4];
62  }
63  // Compose partial right arguments.
64  value = source[5];
65  if (value) {
66  partials = data[5];
67  data[5] = partials ? composeArgsRight(partials, value, source[6]) : value;
68  data[6] = partials ? replaceHolders(data[5], PLACEHOLDER) : source[6];
69  }
70  // Use source `argPos` if available.
71  value = source[7];
72  if (value) {
73  data[7] = value;
74  }
75  // Use source `ary` if it's smaller.
76  if (srcBitmask & WRAP_ARY_FLAG) {
77  data[8] = data[8] == null ? source[8] : nativeMin(data[8], source[8]);
78  }
79  // Use source `arity` if one is not provided.
80  if (data[9] == null) {
81  data[9] = source[9];
82  }
83  // Use source `func` and merge bitmasks.
84  data[0] = source[0];
85  data[1] = newBitmask;
86 
87  return data;
88 }
89 
90 module.exports = mergeData;