ToStringTest.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
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 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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package com.oracle.truffle.api.test.vm;

import com.oracle.truffle.api.interop.ForeignAccess;
import com.oracle.truffle.api.interop.TruffleObject;
import static org.junit.Assert.assertEquals;

import org.junit.Test;

import com.oracle.truffle.api.source.Source;
import com.oracle.truffle.api.vm.PolyglotEngine;

import org.junit.After;
import static org.junit.Assert.assertNull;

public class ToStringTest {
    private PolyglotEngine engine;

    @After
    public void dispose() {
        if (engine != null) {
            engine.dispose();
        }
    }

    @Test
    public void valueToStringValueWith1() throws Exception {
        engine = PolyglotEngine.newBuilder().build();
        PolyglotEngine.Language language1 = engine.getLanguages().get("application/x-test-import-export-1");
        PolyglotEngine.Language language2 = engine.getLanguages().get("application/x-test-import-export-2");
        language2.eval(Source.newBuilder("explicit.value=42").name("define 42").mimeType("content/unknown").build());
        PolyglotEngine.Value value = language1.eval(Source.newBuilder("return=value").name("42.value").mimeType("content/unknown").build());
        assertEquals("It's fourtytwo", "42", value.get());

        String textual = value.as(String.class);
        assertEquals("Nicely formated as by L1", "42: Int", textual);
    }

    @Test
    public void valueToStringValueWith2() throws Exception {
        engine = PolyglotEngine.newBuilder().build();
        PolyglotEngine.Language language1 = engine.getLanguages().get("application/x-test-import-export-1");
        PolyglotEngine.Language language2 = engine.getLanguages().get("application/x-test-import-export-2");
        language1.eval(Source.newBuilder("explicit.value=42").name("define 42").mimeType("content/unknown").build());
        PolyglotEngine.Value value = language2.eval(Source.newBuilder("return=value").name("42.value").mimeType("content/unknown").build());
        assertEquals("It's fourtytwo", "42", value.get());

        String textual = value.as(String.class);
        assertEquals("Nicely formated as by L2", "42.0: Double", textual);
    }

    @Test
    public void toStringForNullLikeValue() throws Exception {
        engine = PolyglotEngine.newBuilder().build();
        final Source src0 = Source.newBuilder("0").mimeType("application/x-unbox").name("zero.ux").build();
        PolyglotEngine.Value fourtyTwo = engine.eval(src0).execute();
        assertNull("Zero is treated as null", fourtyTwo.get());
        assertEquals("MyLang.toString is called", "Unboxed: 0", fourtyTwo.as(String.class));
    }

    @Test
    public void toStringForUnboxValue() throws Exception {
        engine = PolyglotEngine.newBuilder().build();
        final Source src42 = Source.newBuilder("42").mimeType("application/x-unbox").name("fortyTwo.ux").build();
        PolyglotEngine.Value fourtyTwo = engine.eval(src42).execute();
        assertEquals("Should always work", Integer.valueOf(42), fourtyTwo.as(Integer.class));
        assertEquals("Current behavior", Integer.valueOf(42), fourtyTwo.get());
        assertEquals("MyLang.toString is called", "Unboxed: 42", fourtyTwo.as(String.class));
    }

    @Test
    public void toStringWithoutALanguage() throws Exception {
        engine = PolyglotEngine.newBuilder().globalSymbol("value", "Ahoj").build();
        PolyglotEngine.Value value = engine.findGlobalSymbol("value");
        assertEquals("Converted", "Ahoj", value.as(String.class));
    }

    @Test
    public void toStringOnIntWithoutALanguage() throws Exception {
        engine = PolyglotEngine.newBuilder().globalSymbol("value", 42).build();
        PolyglotEngine.Value value = engine.findGlobalSymbol("value");
        assertEquals("Converted", "42", value.as(String.class));
    }

    @Test
    public void toStringCallsToStringWithoutALanguage() throws Exception {
        class MyObj implements TruffleObject {
            @Override
            public ForeignAccess getForeignAccess() {
                return null;
            }

            @Override
            public String toString() {
                return "Ahoj";
            }
        }

        engine = PolyglotEngine.newBuilder().globalSymbol("value", new MyObj()).build();
        PolyglotEngine.Value value = engine.findGlobalSymbol("value");
        assertEquals("Converted via toString() call", "Ahoj", value.as(String.class));
    }
}