named-function-expression.js 7.14 KB
Newer Older
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
// Copyright 2013 the V8 project authors. All rights reserved.
// Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1.  Redistributions of source code must retain the above copyright
//     notice, this list of conditions and the following disclaimer.
// 2.  Redistributions in binary form must reproduce the above copyright
//     notice, this list of conditions and the following disclaimer in the
//     documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
// ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

description(
"Tests variable resolution rules for named function expressions."
);

function Call(lambda) { return lambda(); }

debug("anonymous function expression");
shouldBe("var x = (function(a,b){ return a + b; }); x(1,2)", "3");

debug("named function expression");
shouldBe("var x = (function Named(a,b){ return a + b; }); x(2,3)", "5");

debug("eval'd code should be able to access scoped variables");
shouldBe("var z = 6; var x = eval('(function(a,b){ return a + b + z; })'); x(3,4)", "13");

debug("eval'd code + self-check");
shouldBe("var z = 10; var x = eval('(function Named(a,b){ return (!!Named) ? (a + b + z) : -999; })'); x(4,5)", "19");

debug("named function expressions are not saved in the current context");
shouldBe('(function Foo(){ return 1; }); try { Foo(); throw "FuncExpr was stored"; } catch(e) { if(typeof(e)=="string") throw e; } 1', "1");

debug("recursion is possible, though");
shouldBe("var ctr = 3; var x = (function Named(a,b){ if(--ctr) return 2 * Named(a,b); else return a + b; }); x(5,6)", "44");

debug("regression test where kjs regarded an anonymous function declaration (which is illegal) as a FunctionExpr");
shouldBe('var hadError = 0; try { eval("function(){ return 2; };"); } catch(e) { hadError = 1; }; hadError;', "1");

debug("\n-----\n");

function shouldBeTrueWithDescription(x, xDescription)
{
        if (x) {
                debug("PASS: " + xDescription + " should be true and is.");
                return;
        }

        debug("FAIL: " + xDescription + " should be true but isn't.");
}

// Recursion.
shouldBeTrueWithDescription(
        (function closure() { return closure == arguments.callee && !this.closure; })(),
        "(function closure() { return closure == arguments.callee && !this.closure; })()"
);

// Assignment.
shouldBeTrueWithDescription(
        (function closure() { closure = 1; return closure == arguments.callee && !this.closure; })(),
        "(function closure() { closure = 1; return closure == arguments.callee && !this.closure; })()"
);

// Function name vs parameter.
shouldBeTrueWithDescription(
        (function closure(closure) { return closure == 1 && !this.closure; })(1),
        "(function closure(closure) { return closure == 1 && !this.closure; })(1)"
);

// Function name vs var.
shouldBeTrueWithDescription(
        (function closure() { var closure = 1; return closure == 1 && !this.closure; })(),
        "(function closure() { var closure = 1; return closure == 1 && !this.closure; })()"
);

// Function name vs declared function.
shouldBeTrueWithDescription(
        (function closure() { function closure() { }; return closure != arguments.callee && !this.closure; })(),
        "(function closure() { function closure() { }; return closure != arguments.callee && !this.closure; })()"
);

// Resolve before tear-off.
shouldBeTrueWithDescription(
        (function closure() { return (function() { return closure && !this.closure; })(); })(),
        "(function closure() { return (function() { return closure && !this.closure; })(); })()"
);

// Resolve assignment before tear-off.
shouldBeTrueWithDescription(
        (function closure() { return (function() { closure = null; return closure && !this.closure; })(); })(),
        "(function closure() { return (function() { closure = null; return closure && !this.closure; })(); })()"
);

// Resolve after tear-off.
shouldBeTrueWithDescription(
        (function closure() { return (function() { return closure && !this.closure; }); })()(),
        "(function closure() { return (function() { return closure && !this.closure; }); })()()"
);

// Resolve assignment after tear-off.
shouldBeTrueWithDescription(
        (function closure() { return (function() { closure = null; return closure && !this.closure; }); })()(),
        "(function closure() { return (function() { closure = null; return closure && !this.closure; }); })()()"
);

// Eval var shadowing (should overwrite).
shouldBeTrueWithDescription(
        (function closure() { eval("var closure"); return closure == undefined && !this.closure; })(),
        "(function closure() { eval(\"var closure\"); return closure == undefined && !this.closure; })()"
);

// Eval function shadowing (should overwrite).
shouldBeTrueWithDescription(
        (function closure() { eval("function closure() { }"); return closure != arguments.callee && !this.closure; })(),
        "(function closure() { eval(\"function closure() { }\"); return closure != arguments.callee && !this.closure; })()"
);

// Eval shadowing (should overwrite), followed by put (should overwrite).
shouldBeTrueWithDescription(
        (function closure() { eval("var closure;"); closure = 1; return closure == 1 && !this.closure; })(),
        "(function closure() { eval(\"var closure;\"); closure = 1; return closure == 1 && !this.closure; })()"
);

// Eval var shadowing, followed by delete (should not overwrite).
shouldBeTrueWithDescription(
        (function closure() { eval("var closure"); delete closure; return closure == arguments.callee && !this.closure; })(),
        "(function closure() { eval(\"var closure\"); delete closure; return closure == arguments.callee && !this.closure; })()"
);

// Eval function shadowing, followed by delete (should not overwrite).
shouldBeTrueWithDescription(
        (function closure() { eval("function closure() { }"); delete closure; return closure == arguments.callee && !this.closure; })(),
        "(function closure() { eval(\"function closure() { }\"); delete closure; return closure == arguments.callee && !this.closure; })()"
);

// Eval assignment (should not overwrite).
shouldBeTrueWithDescription(
        (function closure() { eval("closure = 1;"); return closure == arguments.callee && !this.closure; })(),
        "(function closure() { eval(\"closure = 1;\"); return closure == arguments.callee && !this.closure; })()"
);