<?php
namespace eMacros\Runtime\Symbol;
use eMacros\Applicable;
use eMacros\Scope;
use eMacros\GenericList;
class SymbolLookup implements Applicable {
/**
* Obtains a symbol value from current environment
* Usage: (lookup "_value")
* Returns: mixed
* (non-PHPdoc)
* @see \eMacros\Applicable::apply()
*/
public function apply(Scope $scope, GenericList $arguments) {
if (count($arguments) == 0) {
throw new \BadFunctionCallException("SymbolLookup: No parameters found.");
}
$ref = $arguments[0]->evaluate($scope);
if (!is_string($ref) || empty($ref)) {
throw new \InvalidArgumentException("SymbolLookup: Symbol must be specified as a non-empty string.");
}
if (!array_key_exists($ref, $scope->symbols)) {
throw new \InvalidArgumentException(sprintf("SymbolLookup: Symbol %s does not exists on current environment.", $ref));
}
return $scope->symbols[$ref];
}
}
?>
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