gremlin-core/src/test/java/org/apache/tinkerpop/gremlin/language/grammar/StructureElementVisitorTest.java

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 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
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package org.apache.tinkerpop.gremlin.language.grammar;

import org.antlr.v4.runtime.CharStreams;
import org.antlr.v4.runtime.CommonTokenStream;
import org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversalSource;
import org.apache.tinkerpop.gremlin.structure.util.empty.EmptyGraph;
import org.apache.tinkerpop.gremlin.structure.util.reference.ReferenceVertex;
import org.junit.Test;

import static org.junit.Assert.assertEquals;

public class StructureElementVisitorTest {

    private static final GraphTraversalSource g = EmptyGraph.instance().traversal();

    @Test
    public void shouldParseVertex() {
        assertEquals(g.addE("knows").from(new ReferenceVertex(2, "person")), eval("g.addE('knows').from(new Vertex(2, 'person'))"));
        assertEquals(g.addE("knows").to(new ReferenceVertex("1", "person")), eval("g.addE('knows').to(new Vertex('1', 'person'))"));
        assertEquals(g.addE("knows").from(new ReferenceVertex(2, "person")), eval("g.addE('knows').from(new ReferenceVertex(2, 'person'))"));
        assertEquals(g.addE("knows").to(new ReferenceVertex("1", "person")), eval("g.addE('knows').to(new ReferenceVertex('1', 'person'))"));
    }

    private static Object eval(final String query) {
        final GremlinLexer lexer = new GremlinLexer(CharStreams.fromString(query));
        final GremlinParser parser = new GremlinParser(new CommonTokenStream(lexer));
        final GremlinAntlrToJava antlrToLanguage = new GremlinAntlrToJava();
        return antlrToLanguage.visit(parser.queryList());
    }
}