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node_modules/lodash/_mergeData.js

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+var composeArgs = require('./_composeArgs'),
+    composeArgsRight = require('./_composeArgsRight'),
+    replaceHolders = require('./_replaceHolders');
+
+/** Used as the internal argument placeholder. */
+var PLACEHOLDER = '__lodash_placeholder__';
+
+/** Used to compose bitmasks for function metadata. */
+var WRAP_BIND_FLAG = 1,
+    WRAP_BIND_KEY_FLAG = 2,
+    WRAP_CURRY_BOUND_FLAG = 4,
+    WRAP_CURRY_FLAG = 8,
+    WRAP_ARY_FLAG = 128,
+    WRAP_REARG_FLAG = 256;
+
+/* Built-in method references for those with the same name as other `lodash` methods. */
+var nativeMin = Math.min;
+
+/**
+ * Merges the function metadata of `source` into `data`.
+ *
+ * Merging metadata reduces the number of wrappers used to invoke a function.
+ * This is possible because methods like `_.bind`, `_.curry`, and `_.partial`
+ * may be applied regardless of execution order. Methods like `_.ary` and
+ * `_.rearg` modify function arguments, making the order in which they are
+ * executed important, preventing the merging of metadata. However, we make
+ * an exception for a safe combined case where curried functions have `_.ary`
+ * and or `_.rearg` applied.
+ *
+ * @private
+ * @param {Array} data The destination metadata.
+ * @param {Array} source The source metadata.
+ * @returns {Array} Returns `data`.
+ */
+function mergeData(data, source) {
+  var bitmask = data[1],
+      srcBitmask = source[1],
+      newBitmask = bitmask | srcBitmask,
+      isCommon = newBitmask < (WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG | WRAP_ARY_FLAG);
+
+  var isCombo =
+    ((srcBitmask == WRAP_ARY_FLAG) && (bitmask == WRAP_CURRY_FLAG)) ||
+    ((srcBitmask == WRAP_ARY_FLAG) && (bitmask == WRAP_REARG_FLAG) && (data[7].length <= source[8])) ||
+    ((srcBitmask == (WRAP_ARY_FLAG | WRAP_REARG_FLAG)) && (source[7].length <= source[8]) && (bitmask == WRAP_CURRY_FLAG));
+
+  // Exit early if metadata can't be merged.
+  if (!(isCommon || isCombo)) {
+    return data;
+  }
+  // Use source `thisArg` if available.
+  if (srcBitmask & WRAP_BIND_FLAG) {
+    data[2] = source[2];
+    // Set when currying a bound function.
+    newBitmask |= bitmask & WRAP_BIND_FLAG ? 0 : WRAP_CURRY_BOUND_FLAG;
+  }
+  // Compose partial arguments.
+  var value = source[3];
+  if (value) {
+    var partials = data[3];
+    data[3] = partials ? composeArgs(partials, value, source[4]) : value;
+    data[4] = partials ? replaceHolders(data[3], PLACEHOLDER) : source[4];
+  }
+  // Compose partial right arguments.
+  value = source[5];
+  if (value) {
+    partials = data[5];
+    data[5] = partials ? composeArgsRight(partials, value, source[6]) : value;
+    data[6] = partials ? replaceHolders(data[5], PLACEHOLDER) : source[6];
+  }
+  // Use source `argPos` if available.
+  value = source[7];
+  if (value) {
+    data[7] = value;
+  }
+  // Use source `ary` if it's smaller.
+  if (srcBitmask & WRAP_ARY_FLAG) {
+    data[8] = data[8] == null ? source[8] : nativeMin(data[8], source[8]);
+  }
+  // Use source `arity` if one is not provided.
+  if (data[9] == null) {
+    data[9] = source[9];
+  }
+  // Use source `func` and merge bitmasks.
+  data[0] = source[0];
+  data[1] = newBitmask;
+
+  return data;
+}
+
+module.exports = mergeData;