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fn keyword

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This commit is contained in:
Pekka Laiho 2020-05-31 16:35:03 +07:00
parent 51058b18d3
commit c3c5934c57
1 changed files with 25 additions and 0 deletions
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25
src/Evaller.php
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@ -68,6 +68,31 @@ class Evaller
}
return $value;
} elseif ($ast->get(0)->getName() == 'fn') {
if ($ast->count() != 3) {
throw new MadLispException("fn requires exactly 2 arguments");
}
if (!($ast->get(1) instanceof MList)) {
throw new MadLispException("first argument to fn is not list");
}
$bindings = $ast->get(1)->getData();
foreach ($bindings as $bind) {
if (!($bind instanceof Symbol)) {
throw new MadLispException("binding key for fn is not symbol");
}
}
return function (...$args) use ($bindings, $ast, $env) {
$newEnv = new Env($env);
for ($i = 0; $i < count($bindings); $i++) {
$newEnv->set($bindings[$i]->getName(), $args[$i] ?? null);
}
return $this->doEval($ast->get(2), $newEnv);
};
} elseif ($ast->get(0)->getName() == 'if') {
if ($ast->count() < 3 || $ast->count() > 4) {
throw new MadLispException("if requires 2 or 3 arguments");