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allow multiple expressions in let body

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This commit is contained in:
Pekka Laiho 2020-12-11 21:29:35 +07:00
parent 36cf1ad719
commit 83c1e54463
1 changed files with 13 additions and 7 deletions
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20
src/Evaller.php
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@ -264,10 +264,10 @@ class Evaller
return null;
}
} elseif ($symbolName == 'let') {
if ($astLength != 3) {
throw new MadLispException("let requires exactly 2 arguments");
} elseif (!($astData[1] instanceof MList)) {
throw new MadLispException("first argument to let is not list");
if ($astLength < 3) {
throw new MadLispException("let requires at least 2 arguments");
} elseif (!($astData[1] instanceof Seq)) {
throw new MadLispException("first argument to let is not seq");
}
$bindings = $astData[1]->getData();
@ -289,7 +289,13 @@ class Evaller
$newEnv->set($key->getName(), $val);
}
$ast = $astData[2];
// Eval interval expressions
for ($i = 2; $i < $astLength - 1; $i++) {
$this->eval($astData[$i], $newEnv, $depth + 1);
}
// Eval last expression
$ast = $astData[$astLength - 1];
$env = $newEnv;
continue; // tco
} elseif (!$this->safemode && $symbolName == 'load') {
@ -421,8 +427,8 @@ class Evaller
} elseif ($symbolName == 'try') {
if ($astLength != 3) {
throw new MadLispException("try requires exactly 2 arguments");
} elseif (!($astData[2] instanceof MList)) {
throw new MadLispException("second argument to try is not list");
} elseif (!($astData[2] instanceof Seq)) {
throw new MadLispException("second argument to try is not seq");
}
$catch = $astData[2]->getData();