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<?php |
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namespace Desmond\functions\special; |
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use Desmond\functions\DesmondSpecialFunction; |
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use Desmond\ArgumentHelper; |
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use Desmond\data_types\StringType; |
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use Desmond\exceptions\ArgumentException; |
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8
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class TryCatch extends DesmondSpecialFunction |
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{ |
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use ArgumentHelper; |
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public function run(array $args) |
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{ |
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$this->checkForm($args); |
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$statement = $args[0]; |
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$catch = $args[1]; |
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$messageSym = $catch->get(1)->value(); |
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$body = $catch->get(2); |
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try { |
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$first = $this->eval->getReturn($statement); |
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} catch (\Exception $message) { |
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$newId = $this->currentEnv->makeChild(); |
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$this->currentEnv = $this->currentEnv->values[$newId]; |
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$this->currentEnv->set( |
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$messageSym, |
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new StringType($message->getMessage(), true) |
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); |
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$return = $this->eval->getReturn($body); |
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2 |
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$this->currentEnv = $this->currentEnv->getParent(); |
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$this->currentEnv->destroyChild($newId); |
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return $return; |
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} |
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return $first; |
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} |
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private function checkForm($args) |
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{ |
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9 |
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if (empty($args)) { |
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throw new ArgumentException('"try" expects first argument.'); |
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} |
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$this->expectArguments('try', [1 => ['List']], $args); |
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$list = $args[1]; |
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if ($list->getFunction() != 'catch') { |
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throw new ArgumentException('"try" expects argument 2 to be a "catch" function.'); |
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} |
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$catchArgs = $list->getArgs(); |
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$this->expectArguments('catch', [['Symbol']], $catchArgs); |
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if (!isset($catchArgs[1])) { |
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throw new ArgumentException('"catch" expects argument 2.'); |
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} |
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} |
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} |
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Archer70 /
desmond
