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211 lines
4.7 KiB
211 lines
4.7 KiB
<?php
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declare(strict_types=1);
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namespace App\Cfnpp\Expression\Token;
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use App\Cfnpp\Expression\Token;
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use App\Cfnpp\Expression\TokenBinary;
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use App\Cfnpp\Expression\ICloudformationNative;
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/**
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* Basic comparison operators that take two parameters.
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*
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* @author Adam Pippin <hello@adampippin.ca>
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*/
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class OperatorBinary extends TokenBinary implements ICloudformationNative
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{
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/**
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* List of valid operators.
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* @var string[]
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*/
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public const OPERATORS = [
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'and',
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'or',
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'eq',
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'concat',
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'select'
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];
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/**
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* The operator this instance represents.
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* @var string
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*/
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protected $operator;
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/**
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* New binary operator.
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*
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* @param string $operator
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*/
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public function __construct(string $operator)
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{
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$this->operator = $operator;
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}
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/**
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* Get the operator this instance represents.
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*
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* @return string
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*/
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public function getOperator(): string
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{
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return $this->operator;
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}
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public static function isToken(string $stream): bool
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{
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foreach (static::OPERATORS as $operator)
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{
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if (strlen($stream) >= strlen($operator) &&
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substr($stream, 0, strlen($operator)) == $operator)
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{
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return true;
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}
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}
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return false;
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}
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public static function getToken(string &$stream): Token
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{
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foreach (static::OPERATORS as $operator)
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{
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if (strlen($stream) >= strlen($operator) &&
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substr($stream, 0, strlen($operator)) == $operator)
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{
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$operator = substr($stream, 0, strlen($operator));
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$stream = substr($stream, strlen($operator));
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return new OperatorBinary($operator);
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}
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}
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throw new \Exception('Could not parse OperatorBinary');
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}
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/**
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* Execute the operator.
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*
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* Suppressing accesses to arguments since this is guaranteed valid
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* unless there are bugs in Expression.
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* @suppress PhanTypeArraySuspiciousNullable
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* @param ?\App\Util\GraphNode[] $arguments
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* @return \App\Util\GraphNode|Token|scalar|null
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*/
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public function execute(?array $arguments = null)
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{
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$value1 = $arguments[0]->getValue();
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$value2 = $arguments[1]->getValue();
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switch ($this->getOperator())
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{
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case 'and':
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if (is_scalar($value1) && is_scalar($value2))
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{
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return $value1 && $value2;
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}
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elseif (is_scalar($value1))
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{
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return $value1 ? $arguments[1] : false;
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}
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elseif (is_scalar($value2))
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{
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return $value2 ? $arguments[0] : false;
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}
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elseif ($value1 instanceof Parameter && $value2 instanceof Parameter && $value1->getName() == $value2->getName())
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{
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return $value1;
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}
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return null;
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case 'or':
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if (is_scalar($value1) && is_scalar($value2))
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{
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return $value1 || $value2;
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}
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elseif (is_scalar($value1))
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{
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return $value1 ? true : $arguments[1];
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}
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elseif (is_scalar($value2))
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{
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return $value2 ? true : $arguments[0];
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}
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elseif ($value1 instanceof Parameter && $value2 instanceof Parameter && $value1->getName() == $value2->getName())
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{
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return $value1;
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}
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return null;
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case 'eq':
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if (is_scalar($value1) && is_scalar($value2))
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{
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return $arguments[0] == $arguments[1];
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}
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elseif ($value1 instanceof Parameter && $value2 instanceof Parameter && $value1->getName() == $value2->getName())
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{
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return true;
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}
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return null;
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case 'concat':
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if (is_scalar($value1) && is_scalar($value2))
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{
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return $value2.$value1;
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}
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elseif ($value1 instanceof Parameter && is_scalar($value2) && empty($value2))
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{
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return $value1;
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}
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elseif ($value2 instanceof Parameter && is_scalar($value1) && empty($value1))
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{
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return $value2;
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}
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return null;
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case 'select':
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if (is_scalar($value1) && is_array($value2))
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{
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return $value2[$value1];
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}
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return null;
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default:
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throw new \Exception('Missing implementation for binary operator: '.$this->getOperator());
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}
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}
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/**
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* Convert this token into a CloudFormation intrinsic.
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*
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* Suppressing accesses to arguments since this is guaranteed valid
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* unless there are bugs in Expression.
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* @suppress PhanTypeArraySuspiciousNullable
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* @param ?\App\Util\GraphNode[] $arguments
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* @return mixed[]
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*/
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public function toCloudformation(?array $arguments = null): array
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{
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$value1 = $arguments[0]->getValue();
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$value2 = $arguments[1]->getValue();
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switch ($this->getOperator())
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{
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case 'and':
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return ['Fn::And' => [$value1, $value2]];
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case 'or':
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return ['Fn::Or' => [$value1, $value2]];
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case 'eq':
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return ['Fn::Equals' => [$value1, $value2]];
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case 'concat':
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return ['Fn::Join' => ['', [$value2, $value1]]];
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case 'select':
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return ['Fn::Select' => [$value1, $value2]];
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default:
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throw new \Exception('Operator cannot be applied to parameters: '.$this->getOperator());
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}
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}
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}
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