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    • com.mitchellbosecke.pebble.node.expression.PositiveTestExpression Maven / Gradle / Ivy

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    /*******************************************************************************
 * This file is part of Pebble.
 * 
    
 * Copyright (c) 2014 by Mitchell Bösecke
 * 
    
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 ******************************************************************************/
package com.mitchellbosecke.pebble.node.expression;

import com.mitchellbosecke.pebble.error.AttributeNotFoundException;
import com.mitchellbosecke.pebble.error.PebbleException;
import com.mitchellbosecke.pebble.extension.Test;
import com.mitchellbosecke.pebble.extension.core.DefinedTest;
import com.mitchellbosecke.pebble.node.ArgumentsNode;
import com.mitchellbosecke.pebble.node.TestInvocationExpression;
import com.mitchellbosecke.pebble.template.EvaluationContext;
import com.mitchellbosecke.pebble.template.PebbleTemplateImpl;

import java.util.Map;

public class PositiveTestExpression extends BinaryExpression {

    private Test cachedTest;

    @Override
    public Object evaluate(PebbleTemplateImpl self, EvaluationContext context) throws PebbleException {

        TestInvocationExpression testInvocation = (TestInvocationExpression) getRightExpression();
        ArgumentsNode args = testInvocation.getArgs();

        if (cachedTest == null) {
            String testName = testInvocation.getTestName();

            cachedTest = context.getExtensionRegistry().getTest(testInvocation.getTestName());

            if (cachedTest == null) {
                throw new PebbleException(null, String.format("Test [%s] does not exist.", testName),
                        this.getLineNumber(), self.getName());
            }
        }
        Test test = cachedTest;

        Map namedArguments = args.getArgumentMap(self, context, test);

        // This check is not nice, because we use instanceof. However this is
        // the only test which should not fail in strict mode, when the variable
        // is not set, because this method should exactly test this. Hence a
        // generic solution to allow other tests to reuse this feature make no
        // sense.
        if (test instanceof DefinedTest) {
            Object input = null;
            try {
                input = getLeftExpression().evaluate(self, context);
            } catch (AttributeNotFoundException e) {
                input = null;
            }
            return test.apply(input, namedArguments);
        } else {
            return test.apply(getLeftExpression().evaluate(self, context), namedArguments);
        }

    }
}
    
    
    
    

    




    
    
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