source: trip-planner-front/node_modules/lodash/_mergeData.js@ 6fe77af

Last change on this file since 6fe77af was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit

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1var composeArgs = require('./_composeArgs'),
2 composeArgsRight = require('./_composeArgsRight'),
3 replaceHolders = require('./_replaceHolders');
4
5/** Used as the internal argument placeholder. */
6var PLACEHOLDER = '__lodash_placeholder__';
7
8/** Used to compose bitmasks for function metadata. */
9var 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. */
17var nativeMin = Math.min;
18
19/**
20 * Merges the function metadata of `source` into `data`.
21 *
22 * Merging metadata reduces the number of wrappers used to invoke a function.
23 * This is possible because methods like `_.bind`, `_.curry`, and `_.partial`
24 * may be applied regardless of execution order. Methods like `_.ary` and
25 * `_.rearg` modify function arguments, making the order in which they are
26 * executed important, preventing the merging of metadata. However, we make
27 * an exception for a safe combined case where curried functions have `_.ary`
28 * and or `_.rearg` applied.
29 *
30 * @private
31 * @param {Array} data The destination metadata.
32 * @param {Array} source The source metadata.
33 * @returns {Array} Returns `data`.
34 */
35function 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
90module.exports = mergeData;
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