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function(a, b) { return func.apply(undefined, arguments); } : function(a) { return func.apply(undefined, arguments); }; } /** * Creates a function that invokes `func`, with up to `n` arguments, ignoring * any additional arguments. * * @private * @param {Function} func The function to cap arguments for. * @param {number} n The arity cap. * @returns {Function} Returns the new function. */ function baseAry(func, n) { return n == 2 ? function(a, b) { return func(a, b); } : function(a) { return func(a); }; } /** * Creates a clone of `array`. * * @private * @param {Array} array The array to clone. * @returns {Array} Returns the cloned array. */ function cloneArray(array) { var length = array ? array.length : 0, result = Array(length); while (length--) { result[length] = array[length]; } return result; } /** * Creates a function that clones a given object using the assignment `func`. * * @private * @param {Function} func The assignment function. * @returns {Function} Returns the new cloner function. */ function createCloner(func) { return function(object) { return func({}, object); }; } /** * A specialized version of `_.spread` which flattens the spread array into * the arguments of the invoked `func`. * * @private * @param {Function} func The function to spread arguments over. * @param {number} start The start position of the spread. * @returns {Function} Returns the new function. */ function flatSpread(func, start) { return function() { var length = arguments.length, lastIndex = length - 1, args = Array(length); while (length--) { args[length] = arguments[length]; } var array = args[start], otherArgs = args.slice(0, start); if (array) { push.apply(otherArgs, array); } if (start != lastIndex) { push.apply(otherArgs, args.slice(start + 1)); } return func.apply(this, otherArgs); }; } /** * Creates a function that wraps `func` and uses `cloner` to clone the first * argument it receives. * * @private * @param {Function} func The function to wrap. * @param {Function} cloner The function to clone arguments. * @returns {Function} Returns the new immutable function. */ function wrapImmutable(func, cloner) { return function() { var length = arguments.length; if (!length) { return; } var args = Array(length); while (length--) { args[length] = arguments[length]; } var result = args[0] = cloner.apply(undefined, args); func.apply(undefined, args); return result; }; } /** * The base implementation of `convert` which accepts a `util` object of methods * required to perform conversions. * * @param {Object} util The util object. * @param {string} name The name of the function to convert. * @param {Function} func The function to convert. * @param {Object} [options] The options object. * @param {boolean} [options.cap=true] Specify capping iteratee arguments. * @param {boolean} [options.curry=true] Specify currying. * @param {boolean} [options.fixed=true] Specify fixed arity. * @param {boolean} [options.immutable=true] Specify immutable operations. * @param {boolean} [options.rearg=true] Specify rearranging arguments. * @returns {Function|Object} Returns the converted function or object. */ function baseConvert(util, name, func, options) { var isLib = typeof name == 'function', isObj = name === Object(name); if (isObj) { options = func; func = name; name = undefined; } if (func == null) { throw new TypeError; } options || (options = {}); var config = { 'cap': 'cap' in options ? options.cap : true, 'curry': 'curry' in options ? options.curry : true, 'fixed': 'fixed' in options ? options.fixed : true, 'immutable': 'immutable' in options ? options.immutable : true, 'rearg': 'rearg' in options ? options.rearg : true }; var defaultHolder = isLib ? func : fallbackHolder, forceCurry = ('curry' in options) && options.curry, forceFixed = ('fixed' in options) && options.fixed, forceRearg = ('rearg' in options) && options.rearg, pristine = isLib ? func.runInContext() : undefined; var helpers = isLib ? func : { 'ary': util.ary, 'assign': util.assign, 'clone': util.clone, 'curry': util.curry, 'forEach': util.forEach, 'isArray': util.isArray, 'isError': util.isError, 'isFunction': util.isFunction, 'isWeakMap': util.isWeakMap, 'iteratee': util.iteratee, 'keys': util.keys, 'rearg': util.rearg, 'toInteger': util.toInteger, 'toPath': util.toPath }; var ary = helpers.ary, assign = helpers.assign, clone = helpers.clone, curry = helpers.curry, each = helpers.forEach, isArray = helpers.isArray, isError = helpers.isError, isFunction = helpers.isFunction, isWeakMap = helpers.isWeakMap, keys = helpers.keys, rearg = helpers.rearg, toInteger = helpers.toInteger, toPath = helpers.toPath; var aryMethodKeys = keys(mapping.aryMethod); var wrappers = { 'castArray': function(castArray) { return function() { var value = arguments[0]; return isArray(value) ? castArray(cloneArray(value)) : castArray.apply(undefined, arguments); }; }, 'iteratee': function(iteratee) { return function() { var func = arguments[0], arity = arguments[1], result = iteratee(func, arity), length = result.length; if (config.cap && typeof arity == 'number') { arity = arity > 2 ? (arity - 2) : 1; return (length && length <= arity) ? result : baseAry(result, arity); } return result; }; }, 'mixin': function(mixin) { return function(source) { var func = this; if (!isFunction(func)) { return mixin(func, Object(source)); } var pairs = []; each(keys(source), function(key) { if (isFunction(source[key])) { pairs.push([key, func.prototype[key]]); } }); mixin(func, Object(source)); each(pairs, function(pair) { var value = pair[1]; if (isFunction(value)) { func.prototype[pair[0]] = value; } else { delete func.prototype[pair[0]]; } }); return func; }; }, 'nthArg': function(nthArg) { return function(n) { var arity = n < 0 ? 1 : (toInteger(n) + 1); return curry(nthArg(n), arity); }; }, 'rearg': function(rearg) { return function(func, indexes) { var arity = indexes ? indexes.length : 0; return curry(rearg(func, indexes), arity); }; }, 'runInContext': function(runInContext) { return function(context) { return baseConvert(util, runInContext(context), options); }; } }; /*--------------------------------------------------------------------------*/ /** * Casts `func` to a function with an arity capped iteratee if needed. * * @private * @param {string} name The name of the function to inspect. * @param {Function} func The function to inspect. * @returns {Function} Returns the cast function. */ function castCap(name, func) { if (config.cap) { var indexes = mapping.iterateeRearg[name]; if (indexes) { return iterateeRearg(func, indexes); } var n = !isLib && mapping.iterateeAry[name]; if (n) { return iterateeAry(func, n); } } return func; } /** * Casts `func` to a curried function if needed. * * @private * @param {string} name The name of the function to inspect. * @param {Function} func The function to inspect. * @param {number} n The arity of `func`. * @returns {Function} Returns the cast function. */ function castCurry(name, func, n) { return (forceCurry || (config.curry && n > 1)) ? curry(func, n) : func; } /** * Casts `func` to a fixed arity function if needed. * * @private * @param {string} name The name of the function to inspect. * @param {Function} func The function to inspect. * @param {number} n The arity cap. * @returns {Function} Returns the cast function. */ function castFixed(name, func, n) { if (config.fixed && (forceFixed || !mapping.skipFixed[name])) { var data = mapping.methodSpread[name], start = data && data.start; return start === undefined ? ary(func, n) : flatSpread(func, start); } return func; } /** * Casts `func` to an rearged function if needed. * * @private * @param {string} name The name of the function to inspect. * @param {Function} func The function to inspect. * @param {number} n The arity of `func`. * @returns {Function} Returns the cast function. */ function castRearg(name, func, n) { return (config.rearg && n > 1 && (forceRearg || !mapping.skipRearg[name])) ? rearg(func, mapping.methodRearg[name] || mapping.aryRearg[n]) : func; } /** * Creates a clone of `object` by `path`. * * @private * @param {Object} object The object to clone. * @param {Array|string} path The path to clone by. * @returns {Object} Returns the cloned object. */ function cloneByPath(object, path) { path = toPath(path); var index = -1, length = path.length, lastIndex = length - 1, result = clone(Object(object)), nested = result; while (nested != null && ++index < length) { var key = path[index], value = nested[key]; if (value != null && !(isFunction(value) || isError(value) || isWeakMap(value))) { nested[key] = clone(index == lastIndex ? value : Object(value)); } nested = nested[key]; } return result; } /** * Converts `lodash` to an immutable auto-curried iteratee-first data-last * version with conversion `options` applied. * * @param {Object} [options] The options object. See `baseConvert` for more details. * @returns {Function} Returns the converted `lodash`. */ function convertLib(options) { return _.runInContext.convert(options)(undefined); } /** * Create a converter function for `func` of `name`. * * @param {string} name The name of the function to convert. * @param {Function} func The function to convert. * @returns {Function} Returns the new converter function. */ function createConverter(name, func) { var realName = mapping.aliasToReal[name] || name, methodName = mapping.remap[realName] || realName, oldOptions = options; return function(options) { var newUtil = isLib ? pristine : helpers, newFunc = isLib ? pristine[methodName] : func, newOptions = assign(assign({}, oldOptions), options); return baseConvert(newUtil, realName, newFunc, newOptions); }; } /** * Creates a function that wraps `func` to invoke its iteratee, with up to `n` * arguments, ignoring any additional arguments. * * @private * @param {Function} func The function to cap iteratee arguments for. * @param {number} n The arity cap. * @returns {Function} Returns the new function. */ function iterateeAry(func, n) { return overArg(func, function(func) { return typeof func == 'function' ? baseAry(func, n) : func; }); } /** * Creates a function that wraps `func` to invoke its iteratee with arguments * arranged according to the specified `indexes` where the argument value at * the first index is provided as the first argument, the argument value at * the second index is provided as the second argument, and so on. * * @private * @param {Function} func The function to rearrange iteratee arguments for. * @param {number[]} indexes The arranged argument indexes. * @returns {Function} Returns the new function. */ function iterateeRearg(func, indexes) { return overArg(func, function(func) { var n = indexes.length; return baseArity(rearg(baseAry(func, n), indexes), n); }); } /** * Creates a function that invokes `func` with its first argument transformed. * * @private * @param {Function} func The function to wrap. * @param {Function} transform The argument transform. * @returns {Function} Returns the new function. */ function overArg(func, transform) { return function() { var length = arguments.length; if (!length) { return func(); } var args = Array(length); while (length--) { args[length] = arguments[length]; } var index = config.rearg ? 0 : (length - 1); args[index] = transform(args[index]); return func.apply(undefined, args); }; } /** * Creates a function that wraps `func` and applys the conversions * rules by `name`. * * @private * @param {string} name The name of the function to wrap. * @param {Function} func The function to wrap. * @returns {Function} Returns the converted function. */ function wrap(name, func, placeholder) { var result, realName = mapping.aliasToReal[name] || name, wrapped = func, wrapper = wrappers[realName]; if (wrapper) { wrapped = wrapper(func); } else if (config.immutable) { if (mapping.mutate.array[realName]) { wrapped = wrapImmutable(func, cloneArray); } else if (mapping.mutate.object[realName]) { wrapped = wrapImmutable(func, createCloner(func)); } else if (mapping.mutate.set[realName]) { wrapped = wrapImmutable(func, cloneByPath); } } each(aryMethodKeys, function(aryKey) { each(mapping.aryMethod[aryKey], function(otherName) { if (realName == otherName) { var data = mapping.methodSpread[realName], afterRearg = data && data.afterRearg; result = afterRearg ? castFixed(realName, castRearg(realName, wrapped, aryKey), aryKey) : castRearg(realName, castFixed(realName, wrapped, aryKey), aryKey); result = castCap(realName, result); result = castCurry(realName, result, aryKey); return false; } }); return !result; }); result || (result = wrapped); if (result == func) { result = forceCurry ? curry(result, 1) : function() { return func.apply(this, arguments); }; } result.convert = createConverter(realName, func); result.placeholder = func.placeholder = placeholder; return result; } /*--------------------------------------------------------------------------*/ if (!isObj) { return wrap(name, func, defaultHolder); } var _ = func; // Convert methods by ary cap. var pairs = []; each(aryMethodKeys, function(aryKey) { each(mapping.aryMethod[aryKey], function(key) { var func = _[mapping.remap[key] || key]; if (func) { pairs.push([key, wrap(key, func, _)]); } }); }); // Convert remaining methods. each(keys(_), function(key) { var func = _[key]; if (typeof func == 'function') { var length = pairs.length; while (length--) { if (pairs[length][0] == key) { return; } } func.convert = createConverter(key, func); pairs.push([key, func]); } }); // Assign to `_` leaving `_.prototype` unchanged to allow chaining. each(pairs, function(pair) { _[pair[0]] = pair[1]; }); _.convert = convertLib; _.placeholder = _; // Assign aliases. each(keys(_), function(key) { each(mapping.realToAlias[key] || [], function(alias) { _[alias] = _[key]; }); }); return _; } module.exports = baseConvert;