Examples with LexerException de.be4.classicalb.core.parser.lexer.LexerException used on opensource projects

Example 1 with LexerException

use of de.be4.classicalb.core.parser.lexer.LexerException in project probparsers by bendisposto.

the class EventBParser method parse.

/**
 * Parses the input string.
 *
 * @param input
 *            the {@link String} to be parsed
 * @param debugOutput
 *            output debug messages on standard out?
 * @return the root node of the AST
 * @throws BException
 *             The {@link BException} class stores the actual exception as
 *             delegate and forwards all method calls to it. So it is save
 *             for tools to just use this exception if they want to extract
 *             an error message. If the tools needs to extract additional
 *             information, such as a sourcecode position or involved tokens
 *             respectively nodes, it needs to retrieve the delegate
 *             exception. The {@link BException} class offers a
 *             {@link BException#getCause()} method for this, which returns
 *             the delegate exception.
 *             <p>
 *             Internal exceptions:
 *             <ul>
 *             <li> {@link EventBLexerException}: If any error occurs in the
 *             generated or customized lexer a {@link LexerException} is
 *             thrown. Usually the lexer classes just throw a
 *             {@link LexerException}. But this class unfortunately does not
 *             contain any explicit information about the sourcecode
 *             position where the error occured. Using aspect-oriented
 *             programming we intercept the throwing of these exceptions to
 *             replace them by our own exception. In our own exception we
 *             provide the sourcecode position of the last characters that
 *             were read from the input.</li>
 *             <li> {@link EventBParseException}: This exception is thrown in
 *             two situations. On the one hand if the parser throws a
 *             {@link ParserException} we convert it into a
 *             {@link EventBParseException}. On the other hand it can be
 *             thrown if any error is found during the AST transformations
 *             after the parser has finished. We try to provide a token if a
 *             single token is involved in the error. Otherwise a
 *             {@link SourcecodeRange} is provided, which can be used to
 *             retrieve detailed position information from the
 *             {@link SourcePositions} (s. {@link #getSourcePositions()}).</li>
 *             <li> {@link CheckException}: If any problem occurs while
 *             performing semantic checks, a {@link CheckException} is
 *             thrown. We provide one or more nodes that are involved in the
 *             problem. For example, if we find dublicate machine clauses,
 *             we will list all occurances in the exception.</li>
 *             </ul>
 */
public Start parse(final String input, final boolean debugOutput) throws BException {
    final Reader reader = new StringReader(input);
    try {
        /*
			 * Main parser
			 */
        final EventBLexer lexer = new EventBLexer(new PushbackReader(reader, 99));
        lexer.setDebugOutput(debugOutput);
        Parser parser = new Parser(lexer);
        final Start rootNode = parser.parse();
        final List<IToken> tokenList = ((ITokenListContainer) lexer).getTokenList();
        /*
			 * Retrieving sourcecode positions which were found by ParserAspect
			 */
        final Map<PositionedNode, SourcecodeRange> positions = ((IParser) parser).getMapping();
        sourcePositions = new SourcePositions(tokenList, positions);
        parser = null;
        return rootNode;
    } catch (final LexerException e) {
        /*
			 * Actually it's supposed to be a EventBLexerException because the
			 * aspect 'LexerAspect' replaces any LexerException to provide
			 * sourcecode position information in the BLexerException.
			 */
        throw new BException(e);
    } catch (final ParserException e) {
        throw new BException(createEventBParseException(e));
    } catch (final EventBParseException e) {
        throw new BException(e);
    } catch (final IOException e) {
        // shouldn't happen and if, we cannot handle it
        throw new BException(e);
    }
}

Example 2 with LexerException

use of de.be4.classicalb.core.parser.lexer.LexerException in project probparsers by bendisposto.

the class PreParser method parse.

public void parse() throws PreParseException, IOException, BException, BCompoundException {
    final PreLexer preLexer = new PreLexer(pushbackReader);
    final Parser preParser = new Parser(preLexer);
    Start rootNode = null;
    try {
        rootNode = preParser.parse();
    } catch (final ParserException e) {
        if (e.getToken() instanceof de.be4.classicalb.core.preparser.node.TDefinitions) {
            final Token errorToken = e.getToken();
            final String message = "[" + errorToken.getLine() + "," + errorToken.getPos() + "] " + "Clause 'DEFINITIONS' is used more than once";
            throw new PreParseException(e.getToken(), message);
        } else {
            throw new PreParseException(e.getToken(), e.getLocalizedMessage());
        }
    } catch (final LexerException e) {
        throw new PreParseException(e.getLocalizedMessage());
    }
    final DefinitionPreCollector collector = new DefinitionPreCollector();
    rootNode.apply(collector);
    evaluateDefinitionFiles(collector.getFileDefinitions());
    List<Token> sortedDefinitionList = sortDefinitionsByTopologicalOrderAndCheckForCycles(collector.getDefinitions());
    evaluateTypes(sortedDefinitionList, collector.getDefinitions());
}

Example 3 with LexerException

use of de.be4.classicalb.core.parser.lexer.LexerException in project probparsers by bendisposto.

the class CliBParser method parseExtendedFormula.

private static void parseExtendedFormula(String theFormula, IDefinitions context) {
    try {
        BParser parser = new BParser();
        parser.setDefinitions(context);
        Start start = parser.eparse(theFormula, context);
        PrologTermStringOutput strOutput = new PrologTermStringOutput();
        NodeIdAssignment na = new NodeIdAssignment();
        start.apply(na);
        ClassicalPositionPrinter pprinter = new ClassicalPositionPrinter(na, -1, 0);
        ASTProlog printer = new ASTProlog(strOutput, pprinter);
        start.apply(printer);
        strOutput.fullstop();
        // A Friendly Reminder: strOutput includes a newline!
        print(strOutput.toString());
    } catch (NullPointerException e) {
        // Not Parseable - Sadly, calling e.getLocalizedMessage() on the
        // NullPointerException returns NULL itself, thus triggering another
        // NullPointerException in the catch statement. Therefore we need a
        // second catch statement with a special case for the
        // NullPointerException instead of catching a general Exception
        // print("EXCEPTION NullPointerException" + System.lineSeparator());
        PrologTermStringOutput strOutput = new PrologTermStringOutput();
        strOutput.openTerm("exception").printAtom("NullPointerException").closeTerm();
        strOutput.fullstop();
        strOutput.flush();
        print(strOutput.toString());
    } catch (BCompoundException e) {
        PrologExceptionPrinter.printException(socketOutputStream, e, false, true);
    } catch (LexerException e) {
        PrologTermStringOutput strOutput = new PrologTermStringOutput();
        strOutput.openTerm("exception").printAtom(e.getLocalizedMessage()).closeTerm();
        strOutput.fullstop();
        strOutput.flush();
        print(strOutput.toString());
    } catch (IOException e) {
        PrologExceptionPrinter.printException(socketOutputStream, e, theFormula, false, true);
    }
}

Example 4 with LexerException

use of de.be4.classicalb.core.parser.lexer.LexerException in project probparsers by bendisposto.

the class CtlParser method parseFormula.

protected Start parseFormula(final String formula) throws LtlParseException, IOException {
    StringReader reader = new StringReader(formula);
    PushbackReader r = new PushbackReader(reader);
    Lexer l = new CtlLexer(r);
    Parser p = new Parser(l);
    Start ast = null;
    try {
        ast = p.parse();
    } catch (ParserException e) {
        final UniversalToken token = UniversalToken.createToken(e.getToken());
        throw new LtlParseException(token, e.getLocalizedMessage());
    } catch (LexerException e) {
        throw new LtlParseException(null, e.getLocalizedMessage());
    }
    return ast;
}

Example 5 with LexerException

use of de.be4.classicalb.core.parser.lexer.LexerException in project probparsers by bendisposto.

the class BParser method parse.

/**
 * Parses the input string.
 *
 * @param input
 *            The {@link String} to be parsed
 * @param debugOutput
 *            output debug messages on standard out?
 * @param contentProvider
 *            A {@link IFileContentProvider} that is able to load content of
 *            referenced files during the parsing process. The content
 *            provider is used for referenced definition files for example.
 * @return the root node of the AST
 * @throws BCompoundException
 *             The {@link BCompoundException} class stores all
 *             {@link BException}s occurred during the parsing process. The
 *             {@link BException} class stores the actual exception as
 *             delegate and forwards all method calls to it. So it is save
 *             for tools to just use this exception if they want to extract
 *             an error message. If the tools needs to extract additional
 *             information, such as a source code position or involved
 *             tokens respectively nodes, it needs to retrieve the delegate
 *             exception. The {@link BException} class offers a
 *             {@link BException#getCause()} method for this, which returns
 *             the delegate exception.
 *             <p>
 *             Internal exceptions:
 *             <ul>
 *             <li>{@link PreParseException}: This exception contains errors
 *             that occur during the preparsing. If possible it supplies a
 *             token, where the error occurred.</li>
 *             <li>{@link BLexerException}: If any error occurs in the
 *             generated or customized lexer a {@link LexerException} is
 *             thrown. Usually the lexer classes just throw a
 *             {@link LexerException}. But this class unfortunately does not
 *             contain any explicit information about the source code
 *             position where the error occurred. Using aspect-oriented
 *             programming we intercept the throwing of these exceptions to
 *             replace them by our own exception. In our own exception we
 *             provide the source code position of the last characters that
 *             were read from the input.</li>
 *             <li>{@link BParseException}: This exception is thrown in two
 *             situations. On the one hand if the parser throws a
 *             {@link ParserException} we convert it into a
 *             {@link BParseException}. On the other hand it can be thrown
 *             if any error is found during the AST transformations after
 *             the parser has finished.</li>
 *             <li>{@link CheckException}: If any problem occurs while
 *             performing semantic checks, a {@link CheckException} is
 *             thrown. We provide one or more nodes that are involved in the
 *             problem. For example, if we find duplicate machine clauses,
 *             we will list all occurrences in the exception.</li>
 *             </ul>
 */
public Start parse(final String input, final boolean debugOutput, final IFileContentProvider contentProvider) throws BCompoundException {
    final Reader reader = new StringReader(input);
    try {
        // PreParsing
        final DefinitionTypes defTypes = preParsing(debugOutput, reader, contentProvider, directory);
        /*
			 * The definition types are used in the lexer in order to replace an
			 * identifier token by a definition call token. This is required if
			 * the definition is a predicate because an identifier can not be
			 * parsed as a predicate. For example "... SELECT def THEN ... "
			 * would yield to a parse error. The lexer will replace the
			 * identifier token "def" by a TDefLiteralPredicate which will be
			 * excepted by the parser
			 * 
			 */
        defTypes.addAll(definitions.getTypes());
        /*
			 * Main parser
			 */
        final BLexer lexer = new BLexer(new PushbackReader(reader, BLexer.PUSHBACK_BUFFER_SIZE), defTypes);
        lexer.setParseOptions(parseOptions);
        SabbleCCBParser parser = new SabbleCCBParser(lexer);
        final Start rootNode = parser.parse();
        final List<BException> bExceptionList = new ArrayList<>();
        /*
			 * Collect available definition declarations. Needs to be done now
			 * cause they are needed by the following transformations.
			 */
        final DefinitionCollector collector = new DefinitionCollector(defTypes, this.definitions);
        collector.collectDefinitions(rootNode);
        List<CheckException> definitionsCollectorExceptions = collector.getExceptions();
        for (CheckException checkException : definitionsCollectorExceptions) {
            bExceptionList.add(new BException(getFileName(), checkException));
        }
        // perfom AST transformations that can't be done by SableCC
        try {
            applyAstTransformations(rootNode);
        } catch (CheckException e) {
            throw new BCompoundException(new BException(getFileName(), e));
        }
        // perform some semantic checks which are not done in the parser
        List<CheckException> checkExceptions = performSemanticChecks(rootNode);
        for (CheckException checkException : checkExceptions) {
            bExceptionList.add(new BException(getFileName(), checkException));
        }
        if (!bExceptionList.isEmpty()) {
            throw new BCompoundException(bExceptionList);
        }
        return rootNode;
    } catch (final LexerException e) {
        throw new BCompoundException(new BException(getFileName(), e));
    } catch (final BParseException e) {
        throw new BCompoundException(new BException(getFileName(), e));
    } catch (final IOException e) {
        throw new BCompoundException(new BException(getFileName(), e));
    } catch (final PreParseException e) {
        throw new BCompoundException(new BException(getFileName(), e));
    } catch (final ParserException e) {
        final Token token = e.getToken();
        String msg = getImprovedErrorMessageBasedOnTheErrorToken(token);
        if (msg == null) {
            msg = e.getLocalizedMessage();
        }
        final String realMsg = e.getRealMsg();
        throw new BCompoundException(new BException(getFileName(), new BParseException(token, msg, realMsg, e)));
    } catch (BException e) {
        throw new BCompoundException(e);
    }
}