FilterTest.java

package org.jtwig.integration.node;

import org.jtwig.JtwigModel;
import org.jtwig.JtwigTemplate;
import org.jtwig.functions.FunctionRequest;
import org.jtwig.functions.JtwigFunction;
import org.jtwig.functions.SimpleJtwigFunction;
import org.jtwig.integration.AbstractIntegrationTest;
import org.junit.Test;

import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.core.Is.is;
import static org.jtwig.environment.EnvironmentConfigurationBuilder.configuration;

public class FilterTest extends AbstractIntegrationTest {
    @Test
    public void filterWithVariable() throws Exception {
        String result = JtwigTemplate.inlineTemplate("{% filter var1 %}1{% endfilter %}", configuration()
                .functions().add(var1Function()).and()
                .build()).render(JtwigModel.newModel());

        assertThat(result, is("12"));
    }

    @Test
    public void filter() throws Exception {

        String result = JtwigTemplate.inlineTemplate("{% filter lower | capitalize %}HELLO WORLD{% endfilter %}", configuration()
                .build()).render(JtwigModel.newModel());

        assertThat(result, is("Hello world"));
    }

    @Test
    public void filterWithFunction() throws Exception {
        String result = JtwigTemplate.inlineTemplate("{% filter var2(2) %}1{% endfilter %}", configuration()
                .functions().add(var2Function()).and()
                .build()).render(JtwigModel.newModel());

        assertThat(result, is("123"));
    }

    @Test
    public void filterWithComposition() throws Exception {
        String result = JtwigTemplate.inlineTemplate("{% filter var1 | var3 %}1{% endfilter %}", configuration()
                .functions()
                .add(var1Function())
                .add(var3Function())
                .and()
                .build()).render(JtwigModel.newModel());

        assertThat(result, is("123"));
    }

    private JtwigFunction var3Function() {
        return new SimpleJtwigFunction() {
            @Override
            public String name() {
                return "var3";
            }

            @Override
            public Object execute(FunctionRequest request) {
                return request.get(0).toString() + "3";
            }
        };
    }

    private JtwigFunction var2Function() {
        return new SimpleJtwigFunction() {
            @Override
            public String name() {
                return "var2";
            }

            @Override
            public Object execute(FunctionRequest request) {
                return request.get(0).toString() + request.get(1).toString() + "3";
            }
        };
    }

    private JtwigFunction var1Function() {
        return new SimpleJtwigFunction() {
            @Override
            public String name() {
                return "var1";
            }

            @Override
            public Object execute(FunctionRequest request) {
                return request.get(0).toString() + "2";
            }
        };
    }
}