Examples with PredictionContextCache org.antlr.v4.runtime.atn.PredictionContextCache used on opensource projects

Example 11 with PredictionContextCache

use of org.antlr.v4.runtime.atn.PredictionContextCache in project presto by prestodb.

the class AntlrATNCacheFields method configureLexer.

@SuppressWarnings("ObjectEquality")
public void configureLexer(Lexer lexer) {
    requireNonNull(lexer, "lexer is null");
    // Intentional identity equals comparison
    checkArgument(atn == lexer.getATN(), "Lexer ATN mismatch: expected %s, found %s", atn, lexer.getATN());
    lexer.setInterpreter(new LexerATNSimulator(lexer, atn, decisionToDFA, predictionContextCache));
}

Example 12 with PredictionContextCache

use of org.antlr.v4.runtime.atn.PredictionContextCache in project presto by prestodb.

the class AntlrATNCacheFields method configureParser.

@SuppressWarnings("ObjectEquality")
public void configureParser(Parser parser) {
    requireNonNull(parser, "parser is null");
    // Intentional identity equals comparison
    checkArgument(atn == parser.getATN(), "Parser ATN mismatch: expected %s, found %s", atn, parser.getATN());
    parser.setInterpreter(new ParserATNSimulator(parser, atn, decisionToDFA, predictionContextCache));
}

Example 13 with PredictionContextCache

use of org.antlr.v4.runtime.atn.PredictionContextCache in project titan.EclipsePlug-ins by eclipse.

the class TTCN3Analyzer method parse.

/**
 * Parse TTCN-3 file using ANTLR v4
 * @param aReader file to parse (cannot be null, closes aReader)
 * @param aFileLength file length
 * @param aEclipseFile Eclipse dependent resource file
 */
private void parse(final Reader aReader, final int aFileLength, final IFile aEclipseFile) {
    CharStream charStream = new UnbufferedCharStream(aReader);
    Ttcn3Lexer lexer = new Ttcn3Lexer(charStream);
    lexer.setCommentTodo(true);
    lexer.setTokenFactory(new CommonTokenFactory(true));
    lexer.initRootInterval(aFileLength);
    TitanListener lexerListener = new TitanListener();
    // remove ConsoleErrorListener
    lexer.removeErrorListeners();
    lexer.addErrorListener(lexerListener);
    // 1. Previously it was UnbufferedTokenStream(lexer), but it was changed to BufferedTokenStream, because UnbufferedTokenStream seems to be unusable. It is an ANTLR 4 bug.
    // Read this: https://groups.google.com/forum/#!topic/antlr-discussion/gsAu-6d3pKU
    // pr_PatternChunk[StringBuilder builder, boolean[] uni]:
    // $builder.append($v.text); <-- exception is thrown here: java.lang.UnsupportedOperationException: interval 85..85 not in token buffer window: 86..341
    // 2. Changed from BufferedTokenStream to CommonTokenStream, otherwise tokens with "-> channel(HIDDEN)" are not filtered out in lexer.
    final CommonTokenStream tokenStream = new CommonTokenStream(lexer);
    Ttcn3Parser parser = new Ttcn3Parser(tokenStream);
    ParserUtilities.setBuildParseTree(parser);
    PreprocessedTokenStream preprocessor = null;
    if (aEclipseFile != null && GlobalParser.TTCNPP_EXTENSION.equals(aEclipseFile.getFileExtension())) {
        lexer.setTTCNPP();
        preprocessor = new PreprocessedTokenStream(lexer);
        preprocessor.setActualFile(aEclipseFile);
        if (aEclipseFile.getProject() != null) {
            preprocessor.setMacros(PreprocessorSymbolsOptionsData.getTTCN3PreprocessorDefines(aEclipseFile.getProject()));
        }
        parser = new Ttcn3Parser(preprocessor);
        ParserUtilities.setBuildParseTree(parser);
        preprocessor.setActualLexer(lexer);
        preprocessor.setParser(parser);
    }
    if (aEclipseFile != null) {
        lexer.setActualFile(aEclipseFile);
        parser.setActualFile(aEclipseFile);
        parser.setProject(aEclipseFile.getProject());
    }
    // remove ConsoleErrorListener
    parser.removeErrorListeners();
    TitanListener parserListener = new TitanListener();
    parser.addErrorListener(parserListener);
    // This is added because of the following ANTLR 4 bug:
    // Memory Leak in PredictionContextCache #499
    // https://github.com/antlr/antlr4/issues/499
    DFA[] decisionToDFA = parser.getInterpreter().decisionToDFA;
    parser.setInterpreter(new ParserATNSimulator(parser, parser.getATN(), decisionToDFA, new PredictionContextCache()));
    // try SLL mode
    try {
        parser.getInterpreter().setPredictionMode(PredictionMode.SLL);
        final ParseTree root = parser.pr_TTCN3File();
        ParserUtilities.logParseTree(root, parser);
        warnings = parser.getWarnings();
        mErrorsStored = lexerListener.getErrorsStored();
        mErrorsStored.addAll(parserListener.getErrorsStored());
    } catch (RecognitionException e) {
    // quit
    }
    if (!warnings.isEmpty() || !mErrorsStored.isEmpty()) {
        // SLL mode might have failed, try LL mode
        try {
            CharStream charStream2 = new UnbufferedCharStream(aReader);
            lexer.setInputStream(charStream2);
            // lexer.reset();
            parser.reset();
            parserListener.reset();
            parser.getInterpreter().setPredictionMode(PredictionMode.LL);
            final ParseTree root = parser.pr_TTCN3File();
            ParserUtilities.logParseTree(root, parser);
            warnings = parser.getWarnings();
            mErrorsStored = lexerListener.getErrorsStored();
            mErrorsStored.addAll(parserListener.getErrorsStored());
        } catch (RecognitionException e) {
        }
    }
    unsupportedConstructs = parser.getUnsupportedConstructs();
    rootInterval = lexer.getRootInterval();
    actualTtc3Module = parser.getModule();
    if (preprocessor != null) {
        // if the file was preprocessed
        mErrorsStored.addAll(preprocessor.getErrorStorage());
        warnings.addAll(preprocessor.getWarnings());
        unsupportedConstructs.addAll(preprocessor.getUnsupportedConstructs());
        if (actualTtc3Module != null) {
            actualTtc3Module.setIncludedFiles(preprocessor.getIncludedFiles());
            actualTtc3Module.setInactiveCodeLocations(preprocessor.getInactiveCodeLocations());
        }
    }
    try {
        aReader.close();
    } catch (IOException e) {
    }
}

Example 14 with PredictionContextCache

use of org.antlr.v4.runtime.atn.PredictionContextCache in project antlr4 by antlr.

the class TestATNParserPrediction method checkDFAConstruction.

public void checkDFAConstruction(LexerGrammar lg, Grammar g, int decision, String[] inputString, String[] dfaString) {
    // Tool.internalOption_ShowATNConfigsInDFA = true;
    ATN lexatn = createATN(lg, true);
    LexerATNSimulator lexInterp = new LexerATNSimulator(lexatn, new DFA[] { new DFA(lexatn.getDecisionState(Lexer.DEFAULT_MODE)) }, new PredictionContextCache());
    semanticProcess(lg);
    g.importVocab(lg);
    semanticProcess(g);
    ParserInterpreterForTesting interp = new ParserInterpreterForTesting(g, null);
    for (int i = 0; i < inputString.length; i++) {
        // Check DFA
        IntegerList types = getTokenTypesViaATN(inputString[i], lexInterp);
        // System.out.println(types);
        TokenStream input = new MockIntTokenStream(types);
        try {
            interp.adaptivePredict(input, decision, ParserRuleContext.EMPTY);
        } catch (NoViableAltException nvae) {
            nvae.printStackTrace(System.err);
        }
        DFA dfa = interp.parser.decisionToDFA[decision];
        assertEquals(dfaString[i], dfa.toString(g.getVocabulary()));
    }
}