nashorn/samples/this_for_eval.js
author sundar
Fri, 04 Sep 2015 17:11:06 +0530
changeset 32523 d8e365854b3c
permissions -rw-r--r--
8135054: Add more samples to nashorn samples directory Reviewed-by: mhaupt, hannesw
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
32523
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
     1
/*
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
     2
 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
     3
 *
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
     4
 * Redistribution and use in source and binary forms, with or without
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
     5
 * modification, are permitted provided that the following conditions
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
     6
 * are met:
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
     7
 *
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
     8
 *   - Redistributions of source code must retain the above copyright
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
     9
 *     notice, this list of conditions and the following disclaimer.
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    10
 *
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    11
 *   - Redistributions in binary form must reproduce the above copyright
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    12
 *     notice, this list of conditions and the following disclaimer in the
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    13
 *     documentation and/or other materials provided with the distribution.
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    14
 *
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    15
 *   - Neither the name of Oracle nor the names of its
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    16
 *     contributors may be used to endorse or promote products derived
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    17
 *     from this software without specific prior written permission.
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    18
 *
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    19
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    20
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    21
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    22
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    23
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    24
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    25
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    26
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    27
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    28
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    29
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    30
 */
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    31
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    32
// how to pass arbitrary "this" object for eval'ed script?
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    33
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    34
var obj = { foo: 44 };
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    35
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    36
// the following won't work. eval.apply is indirect eval call
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    37
// and so 'this' will be global object always! So, this
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    38
// line will print 'undefined'
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    39
eval.apply(obj, [ " print(this.foo)" ]);
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    40
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    41
obj.myEval = eval;
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    42
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    43
// still won't work - still indirect 'eval' call!
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    44
// still undefined is printed!
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    45
obj.myEval("print(this.foo)");
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    46
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    47
function func(code) {
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    48
    eval(code);
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    49
}
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    50
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    51
// eval called inside func and so get's func's "this" as it's "this"!
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    52
// So, 44 is printed
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    53
d8e365854b3c 8135054: Add more samples to nashorn samples directory
sundar
parents:
diff changeset
    54
func.apply(obj, [ "print(this.foo)" ]);