basant307/AI_Governance_Project

1import composeArgs from './_composeArgs.js';2import composeArgsRight from './_composeArgsRight.js';3import replaceHolders from './_replaceHolders.js';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` and25 * `_.rearg` modify function arguments, making the order in which they are26 * executed important, preventing the merging of metadata. However, we make27 * an exception for a safe combined case where curried functions have `_.ary`28 * and or `_.rearg` applied.29 *30 * @private31 * @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 90export default mergeData;91