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<?php |
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namespace Desmond\data_types; |
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use Desmond\Evaluator; |
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use Desmond\Environment; |
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use Desmond\functions\DesmondFunction; |
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class LambdaType extends DesmondFunction |
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{ |
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private $evaluator; |
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private $preRunEnv; |
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private $creationEnv; |
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private $functionEnv; |
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private $functionEnvId; |
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private $args; |
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private $body; |
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public function __construct($evaluator, $args, $body) |
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{ |
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$this->evaluator = $evaluator; |
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$this->creationEnv = clone($evaluator->currentEnv); |
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$this->args = $args; |
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$this->body = $body; |
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} |
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public function updateCreationEnv(Environment $env) |
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{ |
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$this->creationEnv = clone($env); |
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} |
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public function id() |
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{ |
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return 'anonymous'; |
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} |
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public function run(array $params) |
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{ |
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$this->saveCurrentEnvironment(); |
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$this->useCreationEnvironment(); |
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$this->createChildEnvironment(); |
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for ($i=0; $i<$this->args->count(); $i++) { |
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$this->functionEnv->set( |
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$this->args->get($i)->value(), $params[$i]); |
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} |
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$funcVal = $this->evaluator->getReturn($this->body); |
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$this->destroyFunctionEnvironment(); |
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$this->revertToLiveEnvironment(); |
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return $funcVal; |
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} |
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private function saveCurrentEnvironment() |
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{ |
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$this->preRunEnv = $this->evaluator->currentEnv; |
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} |
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public function useCreationEnvironment() |
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{ |
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$this->evaluator->currentEnv = $this->creationEnv; |
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} |
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private function createChildEnvironment() |
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{ |
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$this->functionEnvId = $this->evaluator->currentEnv->makeChild(); |
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$this->functionEnv = $this->evaluator->currentEnv->values[$this->functionEnvId]; |
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$this->evaluator->currentEnv = $this->functionEnv; |
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} |
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private function destroyFunctionEnvironment() |
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{ |
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$this->evaluator->currentEnv->destroyChild($this->functionEnvId); |
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} |
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private function revertToLiveEnvironment() |
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{ |
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$this->evaluator->currentEnv = $this->preRunEnv; |
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} |
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public function __toString() |
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{ |
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return "#<function>"; |
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} |
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} |
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Archer70 /
desmond
