Mon, 02 Jul 2018 16:43:07 +0100
Merge
sundar@1524 | 1 | /* |
sundar@1524 | 2 | * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. |
sundar@1524 | 3 | * |
sundar@1524 | 4 | * Redistribution and use in source and binary forms, with or without |
sundar@1524 | 5 | * modification, are permitted provided that the following conditions |
sundar@1524 | 6 | * are met: |
sundar@1524 | 7 | * |
sundar@1524 | 8 | * - Redistributions of source code must retain the above copyright |
sundar@1524 | 9 | * notice, this list of conditions and the following disclaimer. |
sundar@1524 | 10 | * |
sundar@1524 | 11 | * - Redistributions in binary form must reproduce the above copyright |
sundar@1524 | 12 | * notice, this list of conditions and the following disclaimer in the |
sundar@1524 | 13 | * documentation and/or other materials provided with the distribution. |
sundar@1524 | 14 | * |
sundar@1524 | 15 | * - Neither the name of Oracle nor the names of its |
sundar@1524 | 16 | * contributors may be used to endorse or promote products derived |
sundar@1524 | 17 | * from this software without specific prior written permission. |
sundar@1524 | 18 | * |
sundar@1524 | 19 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
sundar@1524 | 20 | * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
sundar@1524 | 21 | * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
sundar@1524 | 22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
sundar@1524 | 23 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
sundar@1524 | 24 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
sundar@1524 | 25 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
sundar@1524 | 26 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
sundar@1524 | 27 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
sundar@1524 | 28 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
sundar@1524 | 29 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
sundar@1524 | 30 | */ |
sundar@1524 | 31 | |
sundar@1524 | 32 | // how to pass arbitrary "this" object for eval'ed script? |
sundar@1524 | 33 | |
sundar@1524 | 34 | var obj = { foo: 44 }; |
sundar@1524 | 35 | |
sundar@1524 | 36 | // the following won't work. eval.apply is indirect eval call |
sundar@1524 | 37 | // and so 'this' will be global object always! So, this |
sundar@1524 | 38 | // line will print 'undefined' |
sundar@1524 | 39 | eval.apply(obj, [ " print(this.foo)" ]); |
sundar@1524 | 40 | |
sundar@1524 | 41 | obj.myEval = eval; |
sundar@1524 | 42 | |
sundar@1524 | 43 | // still won't work - still indirect 'eval' call! |
sundar@1524 | 44 | // still undefined is printed! |
sundar@1524 | 45 | obj.myEval("print(this.foo)"); |
sundar@1524 | 46 | |
sundar@1524 | 47 | function func(code) { |
sundar@1524 | 48 | eval(code); |
sundar@1524 | 49 | } |
sundar@1524 | 50 | |
sundar@1524 | 51 | // eval called inside func and so get's func's "this" as it's "this"! |
sundar@1524 | 52 | // So, 44 is printed |
sundar@1524 | 53 | |
sundar@1524 | 54 | func.apply(obj, [ "print(this.foo)" ]); |