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Truffle SL is an example language implemented using the Truffle API.
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/*
 * Copyright (c) 2017, 2020, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * The Universal Permissive License (UPL), Version 1.0
 *
 * Subject to the condition set forth below, permission is hereby granted to any
 * person obtaining a copy of this software, associated documentation and/or
 * data (collectively the "Software"), free of charge and under any and all
 * copyright rights in the Software, and any and all patent rights owned or
 * freely licensable by each licensor hereunder covering either (i) the
 * unmodified Software as contributed to or provided by such licensor, or (ii)
 * the Larger Works (as defined below), to deal in both
 *
 * (a) the Software, and
 *
 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
 * one is included with the Software each a "Larger Work" to which the Software
 * is contributed by such licensors),
 *
 * without restriction, including without limitation the rights to copy, create
 * derivative works of, display, perform, and distribute the Software and make,
 * use, sell, offer for sale, import, export, have made, and have sold the
 * Software and the Larger Work(s), and to sublicense the foregoing rights on
 * either these or other terms.
 *
 * This license is subject to the following condition:
 *
 * The above copyright notice and either this complete permission notice or at a
 * minimum a reference to the UPL must be included in all copies or substantial
 * portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package com.oracle.truffle.sl.parser;

import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
import com.oracle.truffle.api.interop.ExceptionType;
import com.oracle.truffle.api.interop.InteropLibrary;
import com.oracle.truffle.api.exception.AbstractTruffleException;
import com.oracle.truffle.api.interop.UnsupportedMessageException;
import com.oracle.truffle.api.library.ExportLibrary;
import com.oracle.truffle.api.library.ExportMessage;
import com.oracle.truffle.api.source.Source;
import com.oracle.truffle.api.source.SourceSection;

@ExportLibrary(InteropLibrary.class)
public class SLParseError extends AbstractTruffleException {

    public static final long serialVersionUID = 1L;
    private final Source source;
    private final int line;
    private final int column;
    private final int length;

    public SLParseError(Source source, int line, int column, int length, String message) {
        super(message);
        this.source = source;
        this.line = line;
        this.column = column;
        this.length = length;
    }

    /**
     * Note that any subclass of {@link AbstractTruffleException} must always return
     * true for {@link InteropLibrary#isException(Object)}. That is why it is correct
     * to export {@link #getExceptionType()} without implementing
     * {@link InteropLibrary#isException(Object)}.
     */
    @ExportMessage
    ExceptionType getExceptionType() {
        return ExceptionType.PARSE_ERROR;
    }

    @ExportMessage
    boolean hasSourceLocation() {
        return source != null;
    }

    @ExportMessage(name = "getSourceLocation")
    @TruffleBoundary
    SourceSection getSourceSection() throws UnsupportedMessageException {
        if (source == null) {
            throw UnsupportedMessageException.create();
        }
        return source.createSection(line, column, length);
    }
}