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Diffstat (limited to 'tools/eslint/node_modules/js-yaml/node_modules/argparse/node_modules/lodash/internal/mergeData.js')
-rw-r--r-- | tools/eslint/node_modules/js-yaml/node_modules/argparse/node_modules/lodash/internal/mergeData.js | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/tools/eslint/node_modules/js-yaml/node_modules/argparse/node_modules/lodash/internal/mergeData.js b/tools/eslint/node_modules/js-yaml/node_modules/argparse/node_modules/lodash/internal/mergeData.js new file mode 100644 index 0000000000..29297c78aa --- /dev/null +++ b/tools/eslint/node_modules/js-yaml/node_modules/argparse/node_modules/lodash/internal/mergeData.js @@ -0,0 +1,89 @@ +var arrayCopy = require('./arrayCopy'), + composeArgs = require('./composeArgs'), + composeArgsRight = require('./composeArgsRight'), + replaceHolders = require('./replaceHolders'); + +/** Used to compose bitmasks for wrapper metadata. */ +var BIND_FLAG = 1, + CURRY_BOUND_FLAG = 4, + CURRY_FLAG = 8, + ARY_FLAG = 128, + REARG_FLAG = 256; + +/** Used as the internal argument placeholder. */ +var PLACEHOLDER = '__lodash_placeholder__'; + +/* Native 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 required 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` + * augment function arguments, making the order in which they are executed important, + * preventing the merging of metadata. However, we make an exception for a safe + * common 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 < ARY_FLAG; + + var isCombo = + (srcBitmask == ARY_FLAG && bitmask == CURRY_FLAG) || + (srcBitmask == ARY_FLAG && bitmask == REARG_FLAG && data[7].length <= source[8]) || + (srcBitmask == (ARY_FLAG | REARG_FLAG) && bitmask == CURRY_FLAG); + + // Exit early if metadata can't be merged. + if (!(isCommon || isCombo)) { + return data; + } + // Use source `thisArg` if available. + if (srcBitmask & BIND_FLAG) { + data[2] = source[2]; + // Set when currying a bound function. + newBitmask |= (bitmask & BIND_FLAG) ? 0 : CURRY_BOUND_FLAG; + } + // Compose partial arguments. + var value = source[3]; + if (value) { + var partials = data[3]; + data[3] = partials ? composeArgs(partials, value, source[4]) : arrayCopy(value); + data[4] = partials ? replaceHolders(data[3], PLACEHOLDER) : arrayCopy(source[4]); + } + // Compose partial right arguments. + value = source[5]; + if (value) { + partials = data[5]; + data[5] = partials ? composeArgsRight(partials, value, source[6]) : arrayCopy(value); + data[6] = partials ? replaceHolders(data[5], PLACEHOLDER) : arrayCopy(source[6]); + } + // Use source `argPos` if available. + value = source[7]; + if (value) { + data[7] = arrayCopy(value); + } + // Use source `ary` if it's smaller. + if (srcBitmask & 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; |