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 | 1 1 9 9 9 1 9 9 1 1 437 437 455 455 232 1 130 130 130 99 109 109 66 43 42 1 108 108 108 53 9 9 9 53 7 7 16 46 108 31 129 248 129 1 1 594 10 584 1 1 129 38 13 10 4 4 13 38 8 9 30 1 14 13 10 9 6 9 9 15 15 15 3 3 19 19 19 40 11 8 10 10 16 8 2 4 7 2 2 113 28 50 50 4 85 5 5 1 47 47 2 45 1 44 154 1 153 45 8 1 139 139 1 1 69 65 229 4 3 1 1 68 67 65 65 65 65 233 233 233 64 67 67 67 1 69 52 52 69 67 50 1 4 4 1 3 3 1 3 3 1 2 3 3 3 1 1 1 | /* * Sift * * Copryright 2011, Craig Condon * Licensed under MIT * * Inspired by mongodb's query language */ (function() { /** */ function _convertDotToSubObject(keyParts, value) { var subObject = {}; var currentValue = subObject; for (var i = 0, n = keyParts.length - 1; i < n; i++) { currentValue = currentValue[keyParts[i]] = {}; } currentValue[keyParts[i]] = value; return subObject; } /** */ function QueryParser() { /** * tests against data */ var test = this.test = function(statement, data) { var exprs = statement.exprs; //generally, expressions are ordered from least efficient, to most efficient. for (var i = 0, n = exprs.length; i < n; i++) { var expr = exprs[i]; if (!expr.e(expr.v, _comparable(data), data)) return false; } return true; }; /** * parses a statement into something evaluable */ var parse = this.parse = function(statement, key) { //fixes sift(null, []) issue if (!statement) statement = { $eq: statement }; var testers = []; //if the statement is an object, then we're looking at something like: { key: match } if (Object.prototype.toString.call(statement) === "[object Object]") { for (var k in statement) { //find the apropriate operator. If one doesn't exist and the key does not start //with a $ character, then it's a property, which means we create a new statement //(traversing) var operator; if (!!_testers[k]) { operator = k; } else if (k.substr(0, 1) !== "$") { operator = "$trav"; } else { throw new Error("Unknown operator " + k + "."); } //value of given statement (the match) var value = statement[k]; //default = match var exprValue = value; //if we're working with a traversable operator, then set the expr value if (TRAV_OP[operator]) { //using dot notation? convert into a sub-object if (~k.indexOf(".")) { var keyParts = k.split("."); k = keyParts.shift(); //we're using the first key, so remove it exprValue = value = _convertDotToSubObject(keyParts, value); } //*if* the value is an array, then we're dealing with something like: $or, $and if (value instanceof Array) { exprValue = []; for (var i = value.length; i--;) { exprValue.push(parse(value[i])); } //otherwise we're dealing with $trav } else { exprValue = parse(value, k); } } testers.push(_getExpr(operator, k, exprValue)); } //otherwise we're comparing a particular value, so set to eq } else { testers.push(_getExpr("$eq", key, statement)); } var stmt = { exprs: testers, k: key, test: function(value) { return test(stmt, value); } }; return stmt; }; //traversable statements var TRAV_OP = this.traversable = { $and: true, $or: true, $nor: true, $trav: true, $not: true }; function _comparable(value) { if (value instanceof Date) { return value.getTime(); } else { return value; } } function btop(value) { return !!value; } var _testers = this.testers = { /** */ $eq: function(a, b) { return a.test(b); }, /** */ $ne: function(a, b) { return !a.test(b); }, /** */ $lt: function(a, b) { return a > b; }, /** */ $gt: function(a, b) { return a < b; }, /** */ $lte: function(a, b) { return a >= b; }, /** */ $gte: function(a, b) { return a <= b; }, /** */ $exists: function(a, b) { return a === (b != null); }, /** */ $in: function(a, b) { //intersecting an array if (b instanceof Array) { for (var i = b.length; i--;) { if (~a.indexOf(b[i])) return true; } } else { return ~a.indexOf(b); } return false; }, /** */ $not: function(a, b) { if (!a.test) throw new Error("$not test should include an expression, not a value. Use $ne instead."); return !a.test(b); }, /** */ $type: function(a, b, org) { //instanceof doesn't work for strings / boolean. instanceof works with inheritance return org != null ? org instanceof a || org.constructor == a : false; }, /** */ $nin: function(a, b) { return !_testers.$in(a, b); }, /** */ $mod: function(a, b) { return b % a[0] == a[1]; }, /** */ $all: function(a, b) { if (!b) b = []; for (var i = a.length; i--;) { var a1 = a[i]; var indexInB = ~b.indexOf(a1); if (!indexInB) return false; } return true; }, /** */ $size: function(a, b) { return b ? a === b.length : false; }, /** */ $or: function(a, b) { var i = a.length; var n = i; for (; i--;) { if (test(a[i], b)) { return true; } } return n === 0; }, /** */ $nor: function(a, b) { var i = a.length; for (; i--;) { if (test(a[i], b)) { return false; } } return true; }, /** */ $and: function(a, b) { for (var i = a.length; i--;) { if (!test(a[i], b)) { return false; } } return true; }, /** */ $trav: function(a, b) { if (b instanceof Array) { for (var i = b.length; i--;) { var subb = b[i]; if (subb[a.k] && test(a, subb[a.k])) return true; } return false; } //continue to traverse even if there isn't a value - this is needed for //something like name:{$exists:false} return test(a, b ? b[a.k] : void 0); }, /** */ $regex: function(a, b) { var aRE = new RegExp(a); return aRE.test(b); } }; var _prepare = { /** */ $eq: function(a) { var fn; if (a instanceof RegExp) { return a; } else if (a instanceof Function) { fn = a; } else { fn = function(b) { if (b instanceof Array) { return ~b.indexOf(a); } else { return a === b; } }; } return { test: fn }; }, /** */ $ne: function(a) { return _prepare.$eq(a); } }; function _getExpr(type, key, value) { var v = _comparable(value); return { //k key k: key, //v value v: _prepare[type] ? _prepare[type](v) : v, //e eval e: _testers[type] }; } } var _queryParser = new QueryParser(); var getSelector = function(selector) { if (!selector) { return function(value) { return value; }; } else if (typeof selector == "function") { return selector; } throw new Error("Unknown sift selector " + selector); }; function createSifter(query, selector) { //build the filter for the sifter var filter = _queryParser.parse(query); //the function used to sift through the given array var self = function(target) { var sifted = []; var testValue; var value; //I'll typically start from the end, but in this case we need to keep the order //of the array the same. for (var i = 0, n = target.length; i < n; i++) { value = target[i]; testValue = selector(value); if (filter.test(testValue)) sifted.push(value); } return sifted; }; //set the test function incase the sifter isn't needed self.test = filter.test; self.query = query; return self; } /** * sifts the given function * @param query the mongodb query * @param target the target array * @param rawSelector the selector for plucking data from the given target */ function sift(query, target, rawSelector) { //must be an array if (typeof target != "object") { rawSelector = target; target = void 0; } var sft = createSifter(query, getSelector(rawSelector)); //target given? sift through it and return the filtered result if (target) return sft(target); //otherwise return the sifter func return sft; } sift.use = function(options) { if (options.operators) sift.useOperators(options.operators); if (typeof options === "function") options(sift); }; sift.useOperators = function(operators) { for (var key in operators) { sift.useOperator(key, operators[key]); } }; sift.useOperator = function(operator, optionsOrFn) { var options = {}; if (typeof optionsOrFn == "object") { options = optionsOrFn; } else { options = { test: optionsOrFn }; } var key = "$" + operator; _queryParser.testers[key] = options.test; if (options.traversable || options.traverse) { _queryParser.traversable[key] = true; } }; //node.js? Eif ((typeof module != "undefined") && (typeof module.exports != "undefined")) { module.exports = sift; } else //browser? if (typeof window != "undefined") { window.sift = sift; } })(); |