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29 lines
561 B
PHP
29 lines
561 B
PHP
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<?php
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namespace MadLisp;
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class Env extends Hash
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{
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protected ?Env $parent;
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public function __construct(?Env $parent = null)
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{
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$this->parent = $parent;
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}
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public function get(string $key)
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{
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if ($this->has($key)) {
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return $this->data[$key];
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} elseif ($this->parent) {
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return $this->parent->get($key);
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}
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throw new MadLispException("symbol $key not defined in env");
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}
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public function set(string $key, $value): void
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{
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$this->data[$key] = $value;
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}
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}
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