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Add de facto standard hyperbolic arithmetic functions #3

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Add de facto standard hyperbolic arithmetic functions #3

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6 changes: 6 additions & 0 deletions docs/index_status.html
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Original file line number Diff line number Diff line change
Expand Up @@ -695,6 +695,12 @@ <h2>9.3 Other arithmetic functors</h2>
<li>acos/1.</li>
<li>atan2/2.</li>
<li>tan/1.</li>
<li>acosh/1.</li>
<li>asinh/1.</li>
<li>atanh/1.</li>
<li>cosh/1.</li>
<li>sinh/1.</li>
<li>tanh/1.</li>
<li>pi/0.</li>
</ol>
</div>
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6 changes: 6 additions & 0 deletions src/docs/content.index_status.template
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Expand Up @@ -334,6 +334,12 @@ The ProscriptLS aspiration includes implementing most of ISO Prolog and some add
<li>acos/1.</li>
<li>atan2/2.</li>
<li>tan/1.</li>
<li>acosh/1.</li>
<li>asinh/1.</li>
<li>atanh/1.</li>
<li>cosh/1.</li>
<li>sinh/1.</li>
<li>tanh/1.</li>
<li>pi/0.</li>
</ol>
</div>
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22 changes: 22 additions & 0 deletions src/engine/foreign.js
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Expand Up @@ -164,6 +164,28 @@ function evaluate_expression(expression, evaluated)
return evaluation_error("zero_divisor");
evaluated.value = round(v[0] /v[1]);
}
// De facto standard
else if (name === "acosh" && arity === 1)
{
if (v[0] < 1)
return evaluation_error("undefined");
evaluated.value = Math.acosh(v[0]);
}
else if (name === "asinh" && arity === 1)
evaluated.value = Math.asinh(v[0]);
else if (name === "atanh" && arity === 1)
{
if (v[0] >= 1)
return evaluation_error("undefined");
evaluated.value = Math.atanh(v[0]);
}
else if (name === "cosh" && arity === 1)
evaluated.value = Math.cosh(v[0]);
else if (name === "sinh" && arity === 1)
evaluated.value = Math.sinh(v[0]);
else if (name === "tanh" && arity === 1)
evaluated.value = Math.tanh(v[0]);
// Others
else if (name === "random" && arity === 1) {
// random(L) returns integer X in range 0 =< X < L.
let max = Math.floor(v[0]);
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