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27
28// Test the ToPrimitive internal function used by ToNumber/ToString.
29// Does it [[Get]] and [[Call]] the object's toString and valueOf properties
30// correctly. Specifically, does it call [[Get]] only once per property.
31
32var o1 = { toString: function() { return 42; },
33           valueOf: function() { return "37"; } };
34var n1 = Number(o1);
35var s1 = String(o1);
36assertTrue(typeof n1 == "number");
37assertTrue(typeof s1 == "string");
38
39var trace = [];
40var valueOfValue = 42;
41var toStringValue = "foo";
42function traceValueOf () {
43  trace.push("vo");
44  return valueOfValue;
45};
46function traceToString() {
47  trace.push("ts");
48  return toStringValue;
49};
50var valueOfFunc = traceValueOf;
51var toStringFunc = traceToString;
52
53var ot = { get toString() { trace.push("gts");
54                            return toStringFunc; },
55           get valueOf() { trace.push("gvo");
56                           return valueOfFunc; }
57};
58
59var nt = Number(ot);
60assertEquals(42, nt);
61assertEquals(["gvo","vo"], trace);
62
63trace = [];
64var st = String(ot);
65assertEquals("foo", st);
66assertEquals(["gts","ts"], trace);
67
68trace = [];
69valueOfValue = ["not primitive"];
70var nt = Number(ot);
71assertEquals(Number("foo"), nt);
72assertEquals(["gvo", "vo", "gts", "ts"], trace);
73
74trace = [];
75valueOfValue = 42;
76toStringValue = ["not primitive"];
77var st = String(ot);
78assertEquals(String(42), st);
79assertEquals(["gts", "ts", "gvo", "vo"], trace);
80
81trace = [];
82valueOfValue = ["not primitive"];
83assertThrows("Number(ot)", TypeError);
84assertEquals(["gvo", "vo", "gts", "ts"], trace);
85
86
87toStringFunc = "not callable";
88trace = [];
89valueOfValue = 42;
90var st = String(ot);
91assertEquals(String(42), st);
92assertEquals(["gts", "gvo", "vo"], trace);
93
94valueOfFunc = "not callable";
95trace = [];
96assertThrows("String(ot)", TypeError);
97assertEquals(["gts", "gvo"], trace);
98
99toStringFunc = traceToString;
100toStringValue = "87";
101trace = [];
102var nt = Number(ot);
103assertEquals(87, nt);
104assertEquals(["gvo", "gts", "ts"], trace);
105