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Jackson is a high-performance JSON processor (parser, generator)
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package main;

import java.io.*;

import org.codehaus.jackson.*;

/**
 * Unit tests for verifying that support for (non-standard) comments
 * works as expected.
 */
public class TestComments
    extends BaseTest
{
    final static String DOC_WITH_SLASHSTAR_COMMENT =
        "[ /* comment:\n ends here */ 1 /* one more ok to have \"unquoted\"  */ ]"
        ;

    final static String DOC_WITH_SLASHSLASH_COMMENT =
        "[ // comment...\n 1 \r  // one more, not array: []   \n ]"
        ;

    /**
     * Unit test for verifying that by default comments are not
     * recognized.
     */
    public void testDefaultSettings()
        throws Exception
    {
        JsonFactory jf = new JsonFactory();
        assertFalse(jf.isParserFeatureEnabled(JsonParser.Feature.ALLOW_COMMENTS));
        JsonParser jp = jf.createJsonParser(new StringReader("[ 1 ]"));
        assertFalse(jp.isFeatureEnabled(JsonParser.Feature.ALLOW_COMMENTS));
    }

    public void testCommentsDisabled()
        throws Exception
    {
        _testDisabled(DOC_WITH_SLASHSTAR_COMMENT, false);
        _testDisabled(DOC_WITH_SLASHSLASH_COMMENT, false);
        _testDisabled(DOC_WITH_SLASHSTAR_COMMENT, true);
        _testDisabled(DOC_WITH_SLASHSLASH_COMMENT, true);
    }

    public void testCommentsEnabled()
        throws Exception
    {
        _testEnabled(DOC_WITH_SLASHSTAR_COMMENT, false);
        _testEnabled(DOC_WITH_SLASHSLASH_COMMENT, false);
        _testEnabled(DOC_WITH_SLASHSTAR_COMMENT, true);
        _testEnabled(DOC_WITH_SLASHSLASH_COMMENT, true);
    }

    /*
    /////////////////////////////////////////////////
    // Helper methods
    /////////////////////////////////////////////////
     */

    private void _testDisabled(String doc, boolean useStream)
        throws IOException
    {
        JsonParser jp = _createParser(doc, useStream, false);
        try {
            jp.nextToken();
            fail("Expected exception for unrecognized comment");
        } catch (JsonParseException je) {
            // Should have something denoting that user may want to enable 'ALLOW_COMMENTS'
            verifyException(je, "ALLOW_COMMENTS");
        }
    }

    private void _testEnabled(String doc, boolean useStream)
        throws IOException
    {
        JsonParser jp = _createParser(doc, useStream, true);
        assertToken(JsonToken.VALUE_NUMBER_INT, jp.nextToken());
        assertEquals(1, jp.getIntValue());
        assertToken(JsonToken.END_ARRAY, jp.nextToken());
    }

    private JsonParser _createParser(String doc, boolean useStream, boolean enabled)
        throws IOException
    {
        JsonFactory jf = new JsonFactory();
        jf.setParserFeature(JsonParser.Feature.ALLOW_COMMENTS, enabled);
        JsonParser jp = useStream ?
            jf.createJsonParser(doc.getBytes("UTF-8"))
            : jf.createJsonParser(doc);
        assertToken(JsonToken.START_ARRAY, jp.nextToken());
        return jp;
    }
}