Examples with ParseTreeListener org.antlr.v4.runtime.tree.ParseTreeListener used on opensource projects

Example 6 with ParseTreeListener

use of org.antlr.v4.runtime.tree.ParseTreeListener in project antlr4 by antlr.

the class Parser method consume.

/**
	 * Consume and return the {@linkplain #getCurrentToken current symbol}.
	 *
	 * <p>E.g., given the following input with {@code A} being the current
	 * lookahead symbol, this function moves the cursor to {@code B} and returns
	 * {@code A}.</p>
	 *
	 * <pre>
	 *  A B
	 *  ^
	 * </pre>
	 *
	 * If the parser is not in error recovery mode, the consumed symbol is added
	 * to the parse tree using {@link ParserRuleContext#addChild(TerminalNode)}, and
	 * {@link ParseTreeListener#visitTerminal} is called on any parse listeners.
	 * If the parser <em>is</em> in error recovery mode, the consumed symbol is
	 * added to the parse tree using {@link #createErrorNode(ParserRuleContext, Token)} then
     * {@link ParserRuleContext#addErrorNode(ErrorNode)} and
	 * {@link ParseTreeListener#visitErrorNode} is called on any parse
	 * listeners.
	 */
public Token consume() {
    Token o = getCurrentToken();
    if (o.getType() != EOF) {
        getInputStream().consume();
    }
    boolean hasListener = _parseListeners != null && !_parseListeners.isEmpty();
    if (_buildParseTrees || hasListener) {
        if (_errHandler.inErrorRecoveryMode(this)) {
            ErrorNode node = _ctx.addErrorNode(createErrorNode(_ctx, o));
            if (_parseListeners != null) {
                for (ParseTreeListener listener : _parseListeners) {
                    listener.visitErrorNode(node);
                }
            }
        } else {
            TerminalNode node = _ctx.addChild(createTerminalNode(_ctx, o));
            if (_parseListeners != null) {
                for (ParseTreeListener listener : _parseListeners) {
                    listener.visitTerminal(node);
                }
            }
        }
    }
    return o;
}

Example 7 with ParseTreeListener

use of org.antlr.v4.runtime.tree.ParseTreeListener in project antlr4 by antlr.

the class ParseTreeWalker method enterRule.

/**
	 * The discovery of a rule node, involves sending two events: the generic
	 * {@link ParseTreeListener#enterEveryRule} and a
	 * {@link RuleContext}-specific event. First we trigger the generic and then
	 * the rule specific. We to them in reverse order upon finishing the node.
	 */
protected void enterRule(ParseTreeListener listener, RuleNode r) {
    ParserRuleContext ctx = (ParserRuleContext) r.getRuleContext();
    listener.enterEveryRule(ctx);
    ctx.enterRule(listener);
}

Example 8 with ParseTreeListener

use of org.antlr.v4.runtime.tree.ParseTreeListener in project antlr4 by antlr.

the class TestPerformance method getParserFactory.

protected ParserFactory getParserFactory(String lexerName, String parserName, String listenerName, final String entryPoint) {
    try {
        ClassLoader loader = new URLClassLoader(new URL[] { new File(tmpdir).toURI().toURL() }, ClassLoader.getSystemClassLoader());
        final Class<? extends Lexer> lexerClass = loader.loadClass(lexerName).asSubclass(Lexer.class);
        final Class<? extends Parser> parserClass = loader.loadClass(parserName).asSubclass(Parser.class);
        final Class<? extends ParseTreeListener> listenerClass = loader.loadClass(listenerName).asSubclass(ParseTreeListener.class);
        final Constructor<? extends Lexer> lexerCtor = lexerClass.getConstructor(CharStream.class);
        final Constructor<? extends Parser> parserCtor = parserClass.getConstructor(TokenStream.class);
        // construct initial instances of the lexer and parser to deserialize their ATNs
        TokenSource tokenSource = lexerCtor.newInstance(new ANTLRInputStream(""));
        parserCtor.newInstance(new CommonTokenStream(tokenSource));
        return new ParserFactory() {

            @Override
            public FileParseResult parseFile(CharStream input, int currentPass, int thread) {
                final MurmurHashChecksum checksum = new MurmurHashChecksum();
                final long startTime = System.nanoTime();
                assert thread >= 0 && thread < NUMBER_OF_THREADS;
                try {
                    ParseTreeListener listener = sharedListeners[thread];
                    if (listener == null) {
                        listener = listenerClass.newInstance();
                        sharedListeners[thread] = listener;
                    }
                    Lexer lexer = sharedLexers[thread];
                    if (REUSE_LEXER && lexer != null) {
                        lexer.setInputStream(input);
                    } else {
                        Lexer previousLexer = lexer;
                        lexer = lexerCtor.newInstance(input);
                        DFA[] decisionToDFA = (FILE_GRANULARITY || previousLexer == null ? lexer : previousLexer).getInterpreter().decisionToDFA;
                        if (!REUSE_LEXER_DFA || (!FILE_GRANULARITY && previousLexer == null)) {
                            decisionToDFA = new DFA[decisionToDFA.length];
                        }
                        if (COMPUTE_TRANSITION_STATS) {
                            lexer.setInterpreter(new StatisticsLexerATNSimulator(lexer, lexer.getATN(), decisionToDFA, lexer.getInterpreter().getSharedContextCache()));
                        } else if (!REUSE_LEXER_DFA) {
                            lexer.setInterpreter(new LexerATNSimulator(lexer, lexer.getATN(), decisionToDFA, lexer.getInterpreter().getSharedContextCache()));
                        }
                        sharedLexers[thread] = lexer;
                    }
                    lexer.removeErrorListeners();
                    lexer.addErrorListener(DescriptiveErrorListener.INSTANCE);
                    if (lexer.getInterpreter().decisionToDFA[0] == null) {
                        ATN atn = lexer.getATN();
                        for (int i = 0; i < lexer.getInterpreter().decisionToDFA.length; i++) {
                            lexer.getInterpreter().decisionToDFA[i] = new DFA(atn.getDecisionState(i), i);
                        }
                    }
                    CommonTokenStream tokens = new CommonTokenStream(lexer);
                    tokens.fill();
                    tokenCount.addAndGet(currentPass, tokens.size());
                    if (COMPUTE_CHECKSUM) {
                        for (Token token : tokens.getTokens()) {
                            updateChecksum(checksum, token);
                        }
                    }
                    if (!RUN_PARSER) {
                        return new FileParseResult(input.getSourceName(), (int) checksum.getValue(), null, tokens.size(), startTime, lexer, null);
                    }
                    final long parseStartTime = System.nanoTime();
                    Parser parser = sharedParsers[thread];
                    if (REUSE_PARSER && parser != null) {
                        parser.setInputStream(tokens);
                    } else {
                        Parser previousParser = parser;
                        if (USE_PARSER_INTERPRETER) {
                            Parser referenceParser = parserCtor.newInstance(tokens);
                            parser = new ParserInterpreter(referenceParser.getGrammarFileName(), referenceParser.getVocabulary(), Arrays.asList(referenceParser.getRuleNames()), referenceParser.getATN(), tokens);
                        } else {
                            parser = parserCtor.newInstance(tokens);
                        }
                        DFA[] decisionToDFA = (FILE_GRANULARITY || previousParser == null ? parser : previousParser).getInterpreter().decisionToDFA;
                        if (!REUSE_PARSER_DFA || (!FILE_GRANULARITY && previousParser == null)) {
                            decisionToDFA = new DFA[decisionToDFA.length];
                        }
                        if (COMPUTE_TRANSITION_STATS) {
                            parser.setInterpreter(new StatisticsParserATNSimulator(parser, parser.getATN(), decisionToDFA, parser.getInterpreter().getSharedContextCache()));
                        } else if (!REUSE_PARSER_DFA) {
                            parser.setInterpreter(new ParserATNSimulator(parser, parser.getATN(), decisionToDFA, parser.getInterpreter().getSharedContextCache()));
                        }
                        sharedParsers[thread] = parser;
                    }
                    parser.removeParseListeners();
                    parser.removeErrorListeners();
                    if (!TWO_STAGE_PARSING) {
                        parser.addErrorListener(DescriptiveErrorListener.INSTANCE);
                        parser.addErrorListener(new SummarizingDiagnosticErrorListener());
                    }
                    if (parser.getInterpreter().decisionToDFA[0] == null) {
                        ATN atn = parser.getATN();
                        for (int i = 0; i < parser.getInterpreter().decisionToDFA.length; i++) {
                            parser.getInterpreter().decisionToDFA[i] = new DFA(atn.getDecisionState(i), i);
                        }
                    }
                    parser.getInterpreter().setPredictionMode(TWO_STAGE_PARSING ? PredictionMode.SLL : PREDICTION_MODE);
                    parser.setBuildParseTree(BUILD_PARSE_TREES);
                    if (!BUILD_PARSE_TREES && BLANK_LISTENER) {
                        parser.addParseListener(listener);
                    }
                    if (BAIL_ON_ERROR || TWO_STAGE_PARSING) {
                        parser.setErrorHandler(new BailErrorStrategy());
                    }
                    Method parseMethod = parserClass.getMethod(entryPoint);
                    Object parseResult;
                    try {
                        if (COMPUTE_CHECKSUM && !BUILD_PARSE_TREES) {
                            parser.addParseListener(new ChecksumParseTreeListener(checksum));
                        }
                        if (USE_PARSER_INTERPRETER) {
                            ParserInterpreter parserInterpreter = (ParserInterpreter) parser;
                            parseResult = parserInterpreter.parse(Collections.lastIndexOfSubList(Arrays.asList(parser.getRuleNames()), Collections.singletonList(entryPoint)));
                        } else {
                            parseResult = parseMethod.invoke(parser);
                        }
                    } catch (InvocationTargetException ex) {
                        if (!TWO_STAGE_PARSING) {
                            throw ex;
                        }
                        String sourceName = tokens.getSourceName();
                        sourceName = sourceName != null && !sourceName.isEmpty() ? sourceName + ": " : "";
                        if (REPORT_SECOND_STAGE_RETRY) {
                            System.err.println(sourceName + "Forced to retry with full context.");
                        }
                        if (!(ex.getCause() instanceof ParseCancellationException)) {
                            throw ex;
                        }
                        tokens.seek(0);
                        if (REUSE_PARSER && parser != null) {
                            parser.setInputStream(tokens);
                        } else {
                            Parser previousParser = parser;
                            if (USE_PARSER_INTERPRETER) {
                                Parser referenceParser = parserCtor.newInstance(tokens);
                                parser = new ParserInterpreter(referenceParser.getGrammarFileName(), referenceParser.getVocabulary(), Arrays.asList(referenceParser.getRuleNames()), referenceParser.getATN(), tokens);
                            } else {
                                parser = parserCtor.newInstance(tokens);
                            }
                            DFA[] decisionToDFA = previousParser.getInterpreter().decisionToDFA;
                            if (COMPUTE_TRANSITION_STATS) {
                                parser.setInterpreter(new StatisticsParserATNSimulator(parser, parser.getATN(), decisionToDFA, parser.getInterpreter().getSharedContextCache()));
                            } else if (!REUSE_PARSER_DFA) {
                                parser.setInterpreter(new ParserATNSimulator(parser, parser.getATN(), decisionToDFA, parser.getInterpreter().getSharedContextCache()));
                            }
                            sharedParsers[thread] = parser;
                        }
                        parser.removeParseListeners();
                        parser.removeErrorListeners();
                        parser.addErrorListener(DescriptiveErrorListener.INSTANCE);
                        parser.addErrorListener(new SummarizingDiagnosticErrorListener());
                        parser.getInterpreter().setPredictionMode(PredictionMode.LL);
                        parser.setBuildParseTree(BUILD_PARSE_TREES);
                        if (COMPUTE_CHECKSUM && !BUILD_PARSE_TREES) {
                            parser.addParseListener(new ChecksumParseTreeListener(checksum));
                        }
                        if (!BUILD_PARSE_TREES && BLANK_LISTENER) {
                            parser.addParseListener(listener);
                        }
                        if (BAIL_ON_ERROR) {
                            parser.setErrorHandler(new BailErrorStrategy());
                        }
                        parseResult = parseMethod.invoke(parser);
                    }
                    assertThat(parseResult, instanceOf(ParseTree.class));
                    if (COMPUTE_CHECKSUM && BUILD_PARSE_TREES) {
                        ParseTreeWalker.DEFAULT.walk(new ChecksumParseTreeListener(checksum), (ParseTree) parseResult);
                    }
                    if (BUILD_PARSE_TREES && BLANK_LISTENER) {
                        ParseTreeWalker.DEFAULT.walk(listener, (ParseTree) parseResult);
                    }
                    return new FileParseResult(input.getSourceName(), (int) checksum.getValue(), (ParseTree) parseResult, tokens.size(), TIME_PARSE_ONLY ? parseStartTime : startTime, lexer, parser);
                } catch (Exception e) {
                    if (!REPORT_SYNTAX_ERRORS && e instanceof ParseCancellationException) {
                        return new FileParseResult("unknown", (int) checksum.getValue(), null, 0, startTime, null, null);
                    }
                    e.printStackTrace(System.out);
                    throw new IllegalStateException(e);
                }
            }
        };
    } catch (Exception e) {
        e.printStackTrace(System.out);
        Assert.fail(e.getMessage());
        throw new IllegalStateException(e);
    }
}