1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 | // Underscore.js // (c) 2009 Jeremy Ashkenas, DocumentCloud Inc. // Underscore is freely distributable under the terms of the MIT license. // Portions of Underscore are inspired by or borrowed from Prototype.js, // Oliver Steele's Functional, and John Resig's Micro-Templating. // For all details and documentation: // http://documentcloud.github.com/underscore/ (function() { /*------------------------- Baseline setup ---------------------------------*/ // Establish the root object, "window" in the browser, or "global" on the server. var root = this; // Save the previous value of the "_" variable. var previousUnderscore = root._; // If Underscore is called as a function, it returns a wrapped object that // can be used OO-style. This wrapper holds altered versions of all the // underscore functions. Wrapped objects may be chained. var wrapper = function(obj) { this._wrapped = obj; }; // Establish the object that gets thrown to break out of a loop iteration. var breaker = typeof StopIteration !== 'undefined' ? StopIteration : '__break__'; // Create a safe reference to the Underscore object for reference below. var _ = root._ = function(obj) { return new wrapper(obj); }; // Export the Underscore object for CommonJS. if (typeof exports !== 'undefined') exports._ = _; // Current version. _.VERSION = '0.4.3'; /*------------------------ Collection Functions: ---------------------------*/ // The cornerstone, an each implementation. // Handles objects implementing forEach, arrays, and raw objects. _.each = function(obj, iterator, context) { var index = 0; try { if (obj.forEach) { obj.forEach(iterator, context); } else if (obj.length) { for (var i=0, l = obj.length; i<l; i++) iterator.call(context, obj[i], i, obj); } else { for (var key in obj) if (Object.prototype.hasOwnProperty.call(obj, key)) { iterator.call(context, obj[key], key, obj); } } } catch(e) { if (e != breaker) throw e; } return obj; }; // Return the results of applying the iterator to each element. Use JavaScript // 1.6's version of map, if possible. _.map = function(obj, iterator, context) { if (obj && obj.map) return obj.map(iterator, context); var results = []; _.each(obj, function(value, index, list) { results.push(iterator.call(context, value, index, list)); }); return results; }; // Reduce builds up a single result from a list of values. Also known as // inject, or foldl. Uses JavaScript 1.8's version of reduce, if possible. _.reduce = function(obj, memo, iterator, context) { if (obj && obj.reduce) return obj.reduce(_.bind(iterator, context), memo); _.each(obj, function(value, index, list) { memo = iterator.call(context, memo, value, index, list); }); return memo; }; // The right-associative version of reduce, also known as foldr. Uses // JavaScript 1.8's version of reduceRight, if available. _.reduceRight = function(obj, memo, iterator, context) { if (obj && obj.reduceRight) return obj.reduceRight(_.bind(iterator, context), memo); var reversed = _.clone(_.toArray(obj)).reverse(); _.each(reversed, function(value, index) { memo = iterator.call(context, memo, value, index, obj); }); return memo; }; // Return the first value which passes a truth test. _.detect = function(obj, iterator, context) { var result; _.each(obj, function(value, index, list) { if (iterator.call(context, value, index, list)) { result = value; _.breakLoop(); } }); return result; }; // Return all the elements that pass a truth test. Use JavaScript 1.6's // filter(), if it exists. _.select = function(obj, iterator, context) { if (obj.filter) return obj.filter(iterator, context); var results = []; _.each(obj, function(value, index, list) { iterator.call(context, value, index, list) && results.push(value); }); return results; }; // Return all the elements for which a truth test fails. _.reject = function(obj, iterator, context) { var results = []; _.each(obj, function(value, index, list) { !iterator.call(context, value, index, list) && results.push(value); }); return results; }; // Determine whether all of the elements match a truth test. Delegate to // JavaScript 1.6's every(), if it is present. _.all = function(obj, iterator, context) { iterator = iterator || _.identity; if (obj.every) return obj.every(iterator, context); var result = true; _.each(obj, function(value, index, list) { if (!(result = result && iterator.call(context, value, index, list))) _.breakLoop(); }); return result; }; // Determine if at least one element in the object matches a truth test. Use // JavaScript 1.6's some(), if it exists. _.any = function(obj, iterator, context) { iterator = iterator || _.identity; if (obj.some) return obj.some(iterator, context); var result = false; _.each(obj, function(value, index, list) { if (result = iterator.call(context, value, index, list)) _.breakLoop(); }); return result; }; // Determine if a given value is included in the array or object, // based on '==='. _.include = function(obj, target) { if (_.isArray(obj)) return _.indexOf(obj, target) != -1; var found = false; _.each(obj, function(value) { if (found = value === target) _.breakLoop(); }); return found; }; // Invoke a method with arguments on every item in a collection. _.invoke = function(obj, method) { var args = _.toArray(arguments).slice(2); return _.map(obj, function(value) { return (method ? value[method] : value).apply(value, args); }); }; // Convenience version of a common use case of map: fetching a property. _.pluck = function(obj, key) { return _.map(obj, function(value){ return value[key]; }); }; // Return the maximum item or (item-based computation). _.max = function(obj, iterator, context) { if (!iterator && _.isArray(obj)) return Math.max.apply(Math, obj); var result = {computed : -Infinity}; _.each(obj, function(value, index, list) { var computed = iterator ? iterator.call(context, value, index, list) : value; computed >= result.computed && (result = {value : value, computed : computed}); }); return result.value; }; // Return the minimum element (or element-based computation). _.min = function(obj, iterator, context) { if (!iterator && _.isArray(obj)) return Math.min.apply(Math, obj); var result = {computed : Infinity}; _.each(obj, function(value, index, list) { var computed = iterator ? iterator.call(context, value, index, list) : value; computed < result.computed && (result = {value : value, computed : computed}); }); return result.value; }; // Sort the object's values by a criteria produced by an iterator. _.sortBy = function(obj, iterator, context) { return _.pluck(_.map(obj, function(value, index, list) { return { value : value, criteria : iterator.call(context, value, index, list) }; }).sort(function(left, right) { var a = left.criteria, b = right.criteria; return a < b ? -1 : a > b ? 1 : 0; }), 'value'); }; // Use a comparator function to figure out at what index an object should // be inserted so as to maintain order. Uses binary search. _.sortedIndex = function(array, obj, iterator) { iterator = iterator || _.identity; var low = 0, high = array.length; while (low < high) { var mid = (low + high) >> 1; iterator(array[mid]) < iterator(obj) ? low = mid + 1 : high = mid; } return low; }; // Convert anything iterable into a real, live array. _.toArray = function(iterable) { if (!iterable) return []; if (_.isArray(iterable)) return iterable; return _.map(iterable, function(val){ return val; }); }; // Return the number of elements in an object. _.size = function(obj) { return _.toArray(obj).length; }; /*-------------------------- Array Functions: ------------------------------*/ // Get the first element of an array. _.first = function(array) { return array[0]; }; // Get the last element of an array. _.last = function(array) { return array[array.length - 1]; }; // Trim out all falsy values from an array. _.compact = function(array) { return _.select(array, function(value){ return !!value; }); }; // Return a completely flattened version of an array. _.flatten = function(array) { return _.reduce(array, [], function(memo, value) { if (_.isArray(value)) return memo.concat(_.flatten(value)); memo.push(value); return memo; }); }; // Return a version of the array that does not contain the specified value(s). _.without = function(array) { var values = array.slice.call(arguments, 0); return _.select(array, function(value){ return !_.include(values, value); }); }; // Produce a duplicate-free version of the array. If the array has already // been sorted, you have the option of using a faster algorithm. _.uniq = function(array, isSorted) { return _.reduce(array, [], function(memo, el, i) { if (0 == i || (isSorted ? _.last(memo) != el : !_.include(memo, el))) memo.push(el); return memo; }); }; // Produce an array that contains every item shared between all the // passed-in arrays. _.intersect = function(array) { var rest = _.toArray(arguments).slice(1); return _.select(_.uniq(array), function(item) { return _.all(rest, function(other) { return _.indexOf(other, item) >= 0; }); }); }; // Zip together multiple lists into a single array -- elements that share // an index go together. _.zip = function() { var args = _.toArray(arguments); var length = _.max(_.pluck(args, 'length')); var results = new Array(length); for (var i=0; i<length; i++) results[i] = _.pluck(args, String(i)); return results; }; // If the browser doesn't supply us with indexOf (I'm looking at you, MSIE), // we need this function. Return the position of the first occurence of an // item in an array, or -1 if the item is not included in the array. _.indexOf = function(array, item) { if (array.indexOf) return array.indexOf(item); for (var i=0, l=array.length; i<l; i++) if (array[i] === item) return i; return -1; }; // Provide JavaScript 1.6's lastIndexOf, delegating to the native function, // if possible. _.lastIndexOf = function(array, item) { if (array.lastIndexOf) return array.lastIndexOf(item); var i = array.length; while (i--) if (array[i] === item) return i; return -1; }; /* ----------------------- Function Functions: -----------------------------*/ // Create a function bound to a given object (assigning 'this', and arguments, // optionally). Binding with arguments is also known as 'curry'. _.bind = function(func, context) { context = context || root; var args = _.toArray(arguments).slice(2); return function() { var a = args.concat(_.toArray(arguments)); return func.apply(context, a); }; }; // Bind all of an object's methods to that object. Useful for ensuring that // all callbacks defined on an object belong to it. _.bindAll = function() { var args = _.toArray(arguments); var context = args.pop(); _.each(args, function(methodName) { context[methodName] = _.bind(context[methodName], context); }); }; // Delays a function for the given number of milliseconds, and then calls // it with the arguments supplied. _.delay = function(func, wait) { var args = _.toArray(arguments).slice(2); return setTimeout(function(){ return func.apply(func, args); }, wait); }; // Defers a function, scheduling it to run after the current call stack has // cleared. _.defer = function(func) { return _.delay.apply(_, [func, 1].concat(_.toArray(arguments).slice(1))); }; // Returns the first function passed as an argument to the second, // allowing you to adjust arguments, run code before and after, and // conditionally execute the original function. _.wrap = function(func, wrapper) { return function() { var args = [func].concat(_.toArray(arguments)); return wrapper.apply(wrapper, args); }; }; // Returns a function that is the composition of a list of functions, each // consuming the return value of the function that follows. _.compose = function() { var funcs = _.toArray(arguments); return function() { for (var i=funcs.length-1; i >= 0; i--) { arguments = [funcs[i].apply(this, arguments)]; } return arguments[0]; }; }; /* ------------------------- Object Functions: ---------------------------- */ // Retrieve the names of an object's properties. _.keys = function(obj) { return _.map(obj, function(value, key){ return key; }); }; // Retrieve the values of an object's properties. _.values = function(obj) { return _.map(obj, _.identity); }; // Extend a given object with all of the properties in a source object. _.extend = function(destination, source) { for (var property in source) destination[property] = source[property]; return destination; }; // Create a (shallow-cloned) duplicate of an object. _.clone = function(obj) { if (_.isArray(obj)) return obj.slice(0); return _.extend({}, obj); }; // Perform a deep comparison to check if two objects are equal. _.isEqual = function(a, b) { // Check object identity. if (a === b) return true; // Different types? var atype = typeof(a), btype = typeof(b); if (atype != btype) return false; // Basic equality test (watch out for coercions). if (a == b) return true; // One of them implements an isEqual()? if (a.isEqual) return a.isEqual(b); // If a is not an object by this point, we can't handle it. if (atype !== 'object') return false; // Nothing else worked, deep compare the contents. var aKeys = _.keys(a), bKeys = _.keys(b); // Different object sizes? if (aKeys.length != bKeys.length) return false; // Recursive comparison of contents. for (var key in a) if (!_.isEqual(a[key], b[key])) return false; return true; }; // Is a given array or object empty? _.isEmpty = function(obj) { return (_.isArray(obj) ? obj : _.values(obj)).length == 0; }; // Is a given value a DOM element? _.isElement = function(obj) { return !!(obj && obj.nodeType == 1); }; // Is a given value a real Array? _.isArray = function(obj) { return Object.prototype.toString.call(obj) == '[object Array]'; }; // Is a given value a Function? _.isFunction = function(obj) { return Object.prototype.toString.call(obj) == '[object Function]'; }; // Is a given variable undefined? _.isUndefined = function(obj) { return typeof obj == 'undefined'; }; /* -------------------------- Utility Functions: -------------------------- */ // Run Underscore.js in noConflict mode, returning the '_' variable to its // previous owner. Returns a reference to the Underscore object. _.noConflict = function() { root._ = previousUnderscore; return this; }; // Keep the identity function around for default iterators. _.identity = function(value) { return value; }; // Break out of the middle of an iteration. _.breakLoop = function() { throw breaker; }; // Generate a unique integer id (unique within the entire client session). // Useful for temporary DOM ids. var idCounter = 0; _.uniqueId = function(prefix) { var id = idCounter++; return prefix ? prefix + id : id; }; // Return a sorted list of the function names available in Underscore. _.functions = function() { var functions = []; for (var key in _) if (Object.prototype.hasOwnProperty.call(_, key)) functions.push(key); return _.without(functions, 'VERSION', 'prototype', 'noConflict').sort(); }; // JavaScript templating a-la ERB, pilfered from John Resig's // "Secrets of the JavaScript Ninja", page 83. _.template = function(str, data) { var fn = new Function('obj', 'var p=[],print=function(){p.push.apply(p,arguments);};' + 'with(obj){p.push(\'' + str .replace(/[\r\t\n]/g, " ") .split("<%").join("\t") .replace(/((^|%>)[^\t]*)'/g, "$1\r") .replace(/\t=(.*?)%>/g, "',$1,'") .split("\t").join("');") .split("%>").join("p.push('") .split("\r").join("\\'") + "');}return p.join('');"); return data ? fn(data) : fn; }; /*------------------------------- Aliases ----------------------------------*/ _.forEach = _.each; _.foldl = _.inject = _.reduce; _.foldr = _.reduceRight; _.filter = _.select; _.every = _.all; _.some = _.any; _.methods = _.functions; /*------------------------ Setup the OOP Wrapper: --------------------------*/ // Helper function to continue chaining intermediate results. var result = function(obj, chain) { return chain ? _(obj).chain() : obj; }; // Add all of the Underscore functions to the wrapper object. _.each(_.functions(), function(name) { wrapper.prototype[name] = function() { Array.prototype.unshift.call(arguments, this._wrapped); return result(_[name].apply(_, arguments), this._chain); }; }); // Add all mutator Array functions to the wrapper. _.each(['pop', 'push', 'reverse', 'shift', 'sort', 'splice', 'unshift'], function(name) { wrapper.prototype[name] = function() { Array.prototype[name].apply(this._wrapped, arguments); return result(this._wrapped, this._chain); }; }); // Add all accessor Array functions to the wrapper. _.each(['concat', 'join', 'slice'], function(name) { wrapper.prototype[name] = function() { return result(Array.prototype[name].apply(this._wrapped, arguments), this._chain); }; }); // Start chaining a wrapped Underscore object. wrapper.prototype.chain = function() { this._chain = true; return this; }; // Extracts the result from a wrapped and chained object. wrapper.prototype.value = function() { return this._wrapped; }; })(); |