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<?php |
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namespace LegalThings\DataEnricher\Processor; |
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use LegalThings\DataEnricher\Node; |
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use LegalThings\DataEnricher\Processor; |
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use Hoa; |
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/** |
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* Description of Math |
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* |
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* @author arnold |
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*/ |
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class Math implements Processor |
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{ |
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use Processor\Implementation; |
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/** |
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* @var Hoa\Compiler\Llk\Parser |
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*/ |
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protected static $parser; |
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/** |
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* Create a parser for arithmitic expressions |
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* |
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* @return Hoa\Compiler\Llk\Parser |
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*/ |
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protected function getParser() |
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{ |
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if (!isset(static::$parser)) { |
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static::$parser = Hoa\Compiler\Llk\Llk::load( |
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new Hoa\File\Read('hoa://Library/Math/Arithmetic.pp') |
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); |
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} |
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return static::$parser; |
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} |
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/** |
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* Apply processing to a single node |
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* |
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* @param Node $node |
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*/ |
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public function applyToNode(Node $node) |
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{ |
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$expression = $node->getInstruction($this); |
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$ast = $this->getParser()->parse($expression); |
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$variables = $node->getResult() ?: []; |
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$arithmetic = new Hoa\Math\Visitor\Arithmetic(); |
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foreach ($variables as $name => $value) { |
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// Constants are upper case and variables lower case. We don't really care, so using a workaround. |
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if (preg_match('/^[A-Z_][A-Z0-9_]*$/', $name)) { |
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$arithmetic->addConstant($name, $value); |
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} else { |
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$arithmetic->addVariable($name, function() use ($value) { return $value; }); |
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} |
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} |
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$result = $arithmetic->visit($ast); |
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$node->setResult($result); |
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} |
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} |
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legalthings /
data-enricher
