css/css-values/exp-log-compute.html

<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-values-4/#exponent-funcs">
<link rel="help" href="https://drafts.csswg.org/css-values-4/#numbers">
<link rel="help" href="https://drafts.csswg.org/css-values-4/#calc-type-checking">
<link rel="author" title="Apple Inc">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../support/numeric-testcommon.js"></script>
<div id="target"></div>
<script>
// Simple tests
test_math_used('log(1)', '0', {type:'number'});
test_math_used('log(10, 10)', '1', {type:'number'});
test_math_used('exp(0)', '1', {type:'number'});

// Test e
test_math_used('calc(log(e) )', '1', {type:'number', approx:0.1});
test_math_used('calc(e - exp(1))', '0', {type:'number', approx:0.1});

//General calculations
test_math_used('calc(log( 1 + 1 + 2 /2 - 2) )', '0', {type:'number', approx:0.1});
test_math_used('calc(log(1) + exp(0))', '1', {type:'number', approx:0.1});
test_math_used('calc(exp(log(1) + exp(0)*2))', '7.4', {type:'number', approx:0.1});
test_math_used('calc(log(log(1) + exp(0)*10))', '2.3', {type:'number', approx:0.1});
test_math_used('calc(log(log(1) + exp(0)*20, 10))', '1.3', {type:'number', approx:0.1});
test_math_used('calc(log(e)  / log(e) + exp(0)*2 * log(e))', '3', {type:'number', approx:0.1});
test_math_used('calc(log((1 + 1) /2)  / log(e) + exp(0*1)*2 * log(e))', '2', {type:'number', approx:0.1});
test_math_used('calc(log((3 + 1) /2, 2)  / log(e) + exp(0*1)*2 * log(e))', '3', {type:'number', approx:0.1});
test_math_used('calc(log((3 + 1) /2, 2)  / log(e, e) + exp(0*1)*2 * log(e, e))', '3', {type:'number', approx:0.1});
test_math_used('calc(exp(0) + 1)', '2', {type:'number', approx:0.1});

// Test unresolved at parse time
test_math_used('calc(e - exp(sibling-index()))', '0', {type:'number', approx:0.1});
test_math_used('calc(log(exp(2 * sibling-index())))', '2', {type:'number', approx:0.1});
test_math_used('calc(e - exp(sign(1em - 1px)))', '0', {type:'number', approx:0.1});
test_math_used('calc(log(exp(2 * sign(1em - 1px))))', '2', {type:'number', approx:0.1});

// Test nesting
test_math_used('calc(log(exp(1)))', '1', {type:'number', approx:0.1});
test_math_used('calc(log(exp(log(e))))', '1', {type:'number', approx:0.1});

// Special values
// https://drafts.csswg.org/css-values-4/#exponent-infinities

// log(A, B): if B is 1 or negative, the result is NaN.
// B values between 0 and 1, or greater than 1, are valid.
test_nan('log(2, 1)');
test_nan('log(2, -1)');
test_nan('log(2, 0)');
test_nan('log(2, -0)');
test_nan('log(5, 1)');
test_math_used('log(2, 0.5)', '-1', {type: 'number'});
test_math_used('log(2, 2)', '1', {type: 'number'});

// In log(A, B): if A is negative, the result is NaN.
test_nan('log(-1)');
test_nan('log(-1, 2)');

// If A is 0+ or 0-, the result is -infinity.
test_minus_infinity('log(0)');
test_minus_infinity('log(-0)');
test_minus_infinity('log(0, 2)');

// If A is 1, the result is 0+.
test_plus_zero('log(1)');
test_plus_zero('log(1, 2)');
test_plus_zero('log(1, 0.5)');

// If A is +infinity, the result is +infinity.
test_plus_infinity('log(infinity)');
test_plus_infinity('log(infinity, 2)');

// NaN is infectious, even when A is 1.
// https://drafts.csswg.org/css-values-4/#exponent-infinities
// https://drafts.csswg.org/css-values-4/#calc-ieee
test_nan('log(NaN)');
test_nan('log(NaN, 1)');
test_nan('log(1, NaN)');
test_nan('log(NaN, 2)');
test_nan('log(2, NaN)');

// exp()
// If A is +infinity, the result is +infinity.
// If A is -infinity, the result is 0+.
test_plus_infinity('exp(infinity)');
test_plus_zero('exp(-infinity)');

// NaN is infectious
// https://drafts.csswg.org/css-values-4/#exponent-infinities
// https://drafts.csswg.org/css-values-4/#calc-ieee
test_nan('exp(NaN)');
</script>