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Editing: TensorRefOptimizer.php

<?php

namespace Zephir\Optimizers\FunctionCall;

use Zephir\Call;
use Zephir\CompilationContext;
use Zephir\CompiledExpression;
use Zephir\HeadersManager;
use Zephir\Exception\CompilerException;
use Zephir\Optimizers\OptimizerAbstract;

class TensorRefOptimizer extends OptimizerAbstract
{
    /**
     * @param mixed[] $expression
     * @param Call $call
     * @param CompilationContext $context
     * @throws CompilerException
     * @return CompiledExpression|bool
     */
    public function optimize(array $expression, Call $call, CompilationContext $context)
    {
        if (!isset($expression['parameters'])) {
            return false;
        }

if (count($expression['parameters']) !== 1) {
            throw new CompilerException(
                'REF accepts exactly one argument, ' . count($expression['parameters']) . 'given.',
                $expression
            );
        }

$call->processExpectedReturn($context);

$symbolVariable = $call->getSymbolVariable();

if (empty($symbolVariable)) {
            throw new CompilerException('Missing symbol variable.');
        }

if ($symbolVariable->getType() !== 'variable') {
            throw new CompilerException(
                'Return value must only be assigned to a dynamic variable.',
                $expression
            );
        }

if ($call->mustInitSymbolVariable()) {
            $symbolVariable->initVariant($context);
        }

$context->headersManager->add(
            'include/linear_algebra',
            HeadersManager::POSITION_LAST
        );

$resolvedParams = $call->getResolvedParams(
            $expression['parameters'],
            $context,
            $expression
        );

$symbol = $context->backend->getVariableCode($symbolVariable);

$context->codePrinter->output(
            "tensor_ref($symbol, {$resolvedParams[0]});"
        );

return new CompiledExpression(
            'variable',
            $symbolVariable->getRealName(),
            $expression
        );
    }
}

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