blob: d7913bbe19dce9894def56e4ce49710afe790102 [file] [log] [blame]
// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
// Test num.clamp.
// VMOptions=--no-use-field-guards
// VMOptions=
import "package:expect/expect.dart";
// Pedestrian implementation of sign, following its specification directly.
num sign(num value) {
if (value is int) {
if (value < 0) return -1;
if (value > 0) return 1;
return 0;
}
if (value.isNaN) return value;
if (value == 0.0) return value;
if (value > 0.0) return 1.0;
return -1.0;
}
var numbers = [
// Integers
0,
1,
2,
0x7f, // ~7 bits
0x80,
0xff, // ~8 bits
0x100,
0xffff, // ~16 bits
0x10000,
0x3fffffff, // ~30 bits (max positive 32-bit tagged smi)
0x40000000,
0x40000001,
0x7fffffff, // ~31 bits
0x80000000,
0x80000001,
0xfffffffff, // ~32 bits
0x100000000,
0x100000001,
0x10000000000000, // ~53 bits
0x10000000000001,
0x1fffffffffffff,
0x20000000000000,
0x20000000000001, // first integer not representable as double.
0x20000000000002,
0x7fffffffffffffff, // ~63 bits
0x8000000000000000,
0x8000000000000001,
0xffffffffffffffff, // ~64 bits
// Doubles.
0.0,
5e-324, // min positive
2.225073858507201e-308, // max denormal
2.2250738585072014e-308, // min normal
0.49999999999999994, // ~0.5
0.5,
0.5000000000000001,
0.9999999999999999, // ~1.0
1.0,
1.0000000000000002,
4294967295.0, // ~32 bits
4294967296.0,
4503599627370495.5, // max fractional
4503599627370497.0,
9007199254740991.0,
9007199254740992.0, // max exact (+1 is not a double)
1.7976931348623157e+308, // max finite double
1.0 / 0.0, // Infinity
0.0 / 0.0, // NaN
];
main() {
for (num number in numbers) {
test(number);
test(-number);
}
}
void test(number) {
num expectSign = sign(number);
num actualSign = number.sign;
if (expectSign.isNaN) {
Expect.isTrue(actualSign.isNaN, "$number: $actualSign != NaN");
} else {
if (number is int) {
Expect.isTrue(actualSign is int, "$number.sign is int");
} else {
Expect.isTrue(actualSign is double, "$number.sign is double");
}
Expect.equals(expectSign, actualSign, "$number");
Expect.equals(number.isNegative, actualSign.isNegative, "$number:negative");
var renumber = actualSign * number.abs();
Expect.equals(number, renumber, "$number (sign*abs)");
if (number is int) {
Expect.isTrue(renumber is int, "$number (sign*abs) is int");
} else {
Expect.isTrue(renumber is double, "$number (sign*abs) is double");
}
}
}