Examples with InputMismatchException org.antlr.v4.runtime.InputMismatchException used on opensource projects

Example 16 with InputMismatchException

use of org.antlr.v4.runtime.InputMismatchException in project claw-compiler by C2SM-RCM.

the class ClawPragma method analyze.

/**
 * Analyze a raw string input and match it with the CLAW language definition.
 *
 * @param rawPragma A raw pragma statement to be analyzed against the CLAW
 *                  language.
 * @param lineno    Line number of the pragma statement.
 * @return A ClawPragma object with the corresponding extracted information.
 * @throws IllegalDirectiveException If directive does not follow the CLAW
 *                                   language specification.
 */
private static ClawPragma analyze(String rawPragma, int lineno) throws IllegalDirectiveException {
    // Remove additional claw keyword
    rawPragma = nakenize(rawPragma);
    // Discard the ignored code after the claw ignore directive
    if (rawPragma.toLowerCase().contains(IGNORE)) {
        rawPragma = rawPragma.substring(0, rawPragma.toLowerCase().indexOf(IGNORE) + IGNORE.length());
    }
    // Instantiate the lexer with the raw string input
    ClawLexer lexer = new ClawLexer(CharStreams.fromString(rawPragma));
    // Get a list of matched tokens
    CommonTokenStream tokens = new CommonTokenStream(lexer);
    // Pass the tokens to the parser
    ClawParser parser = new ClawParser(tokens);
    parser.setErrorHandler(new BailErrorStrategy());
    parser.removeErrorListeners();
    try {
        // Start the parser analysis from the "analyze" entry point
        ClawParser.AnalyzeContext ctx = parser.analyze();
        // Get the ClawPragma object return by the parser after analysis.
        return ctx.l;
    } catch (ParseCancellationException pcex) {
        if (pcex.getCause() instanceof InputMismatchException) {
            InputMismatchException imex = (InputMismatchException) pcex.getCause();
            throw new IllegalDirectiveException(getTokens(imex.getExpectedTokens(), parser), lineno, imex.getOffendingToken().getCharPositionInLine());
        } else if (pcex.getCause() instanceof NoViableAltException) {
            NoViableAltException nvex = (NoViableAltException) pcex.getCause();
            throw new IllegalDirectiveException(nvex.getOffendingToken().getText(), getTokens(nvex.getExpectedTokens(), parser), lineno, nvex.getOffendingToken().getCharPositionInLine());
        }
        throw new IllegalDirectiveException(rawPragma, "Unsupported construct", lineno, 0);
    }
}