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55 lines
1.4 KiB
55 lines
1.4 KiB
/*
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* ToInteger() (E5 Section 9.4).
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*
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* ToInteger() appears in many places but its result is difficult to get out
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* unaltered. Date.UTC() allows that for TimeClip() range if every argument
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* is given as 0 except milliseconds. The arguments will then be ToNumber()
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* coerced (which is a no-op), and milliseconds will then go through:
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*
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* - MakeTime: will return 0 + 0 + 0 + ToInteger(ms)
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* - MakeDate: year1900_in_msec + ToInteger(ms)
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* - TimeClip: year1900_in_msec + ToInteger(ms) or
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* year1900_in_msec + (+0) + ToInteger(ms),
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* or NaN if abs(ToInteger(ms)) > 8.64e15
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*
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* Negative zero will not survive this process but will be converted to a
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* positive zero. The year 1900 replacement happens because of the explicit
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* year handling step in E5 Section 15.9.4.3, step 8.
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*/
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/*===
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0 -1000000000000
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1 -10000000000
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2 -1000000000
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3 -100
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4 -100
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5 -100
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6 -1
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7 0
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8 0
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9 1
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10 100
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11 100
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12 100
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13 1000000000
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14 10000000000
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15 1000000000000
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===*/
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function simulateToNumber(v) {
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var year1900 = Date.UTC(0, 0, 0, 0, 0, 0, 0).valueOf();
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return Date.UTC(0, 0, 0, 0, 0, 0, v).valueOf() - year1900;
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}
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function test() {
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[ -1e12, -1e10, -1e9, -100.9, -100.5, -100.1, -1, -0, +0, 1, 100.1, 100.5, 100.9,
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1e9, 1e10, 1e12 ].forEach(function (v, i) {
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print(i, simulateToNumber(v));
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});
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}
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try {
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test();
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} catch (e) {
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print(e.stack || e);
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}
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