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

Example 46 with ATN

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

the class GrammarParserInterpreter method deriveTempParserInterpreter.

/** Derive a new parser from an old one that has knowledge of the grammar.
	 *  The Grammar object is used to correctly compute outer alternative
	 *  numbers for parse tree nodes. A parser of the same type is created
	 *  for subclasses of {@link ParserInterpreter}.
	 */
public static ParserInterpreter deriveTempParserInterpreter(Grammar g, Parser originalParser, TokenStream tokens) {
    ParserInterpreter parser;
    if (originalParser instanceof ParserInterpreter) {
        Class<? extends ParserInterpreter> c = originalParser.getClass().asSubclass(ParserInterpreter.class);
        try {
            Constructor<? extends ParserInterpreter> ctor = c.getConstructor(Grammar.class, ATN.class, TokenStream.class);
            parser = ctor.newInstance(g, originalParser.getATN(), originalParser.getTokenStream());
        } catch (Exception e) {
            throw new IllegalArgumentException("can't create parser to match incoming " + originalParser.getClass().getSimpleName(), e);
        }
    } else {
        // must've been a generated parser
        char[] serializedAtn = ATNSerializer.getSerializedAsChars(originalParser.getATN());
        ATN deserialized = new ATNDeserializer().deserialize(serializedAtn);
        parser = new ParserInterpreter(originalParser.getGrammarFileName(), originalParser.getVocabulary(), Arrays.asList(originalParser.getRuleNames()), deserialized, tokens);
    }
    parser.setInputStream(tokens);
    // Make sure that we don't get any error messages from using this temporary parser
    parser.setErrorHandler(new BailErrorStrategy());
    parser.removeErrorListeners();
    parser.removeParseListeners();
    parser.getInterpreter().setPredictionMode(PredictionMode.LL_EXACT_AMBIG_DETECTION);
    return parser;
}

Example 47 with ATN

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

the class BaseBrowserTest method getTokenTypes.

public List<String> getTokenTypes(LexerGrammar lg, ATN atn, CharStream input) {
    LexerATNSimulator interp = new LexerATNSimulator(atn, new DFA[] { new DFA(atn.modeToStartState.get(Lexer.DEFAULT_MODE)) }, null);
    List<String> tokenTypes = new ArrayList<String>();
    int ttype;
    boolean hitEOF = false;
    do {
        if (hitEOF) {
            tokenTypes.add("EOF");
            break;
        }
        int t = input.LA(1);
        ttype = interp.match(input, Lexer.DEFAULT_MODE);
        if (ttype == Token.EOF) {
            tokenTypes.add("EOF");
        } else {
            tokenTypes.add(lg.typeToTokenList.get(ttype));
        }
        if (t == IntStream.EOF) {
            hitEOF = true;
        }
    } while (ttype != Token.EOF);
    return tokenTypes;
}

Example 48 with ATN

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

the class BaseNodeTest method createATN.

protected ATN createATN(Grammar g, boolean useSerializer) {
    if (g.atn == null) {
        semanticProcess(g);
        assertEquals(0, g.tool.getNumErrors());
        ParserATNFactory f;
        if (g.isLexer()) {
            f = new LexerATNFactory((LexerGrammar) g);
        } else {
            f = new ParserATNFactory(g);
        }
        g.atn = f.createATN();
        assertEquals(0, g.tool.getNumErrors());
    }
    ATN atn = g.atn;
    if (useSerializer) {
        char[] serialized = ATNSerializer.getSerializedAsChars(atn);
        return new ATNDeserializer().deserialize(serialized);
    }
    return atn;
}

Example 49 with ATN

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

the class BaseNodeTest method getTokenTypes.

public List<String> getTokenTypes(LexerGrammar lg, ATN atn, CharStream input) {
    LexerATNSimulator interp = new LexerATNSimulator(atn, new DFA[] { new DFA(atn.modeToStartState.get(Lexer.DEFAULT_MODE)) }, null);
    List<String> tokenTypes = new ArrayList<String>();
    int ttype;
    boolean hitEOF = false;
    do {
        if (hitEOF) {
            tokenTypes.add("EOF");
            break;
        }
        int t = input.LA(1);
        ttype = interp.match(input, Lexer.DEFAULT_MODE);
        if (ttype == Token.EOF) {
            tokenTypes.add("EOF");
        } else {
            tokenTypes.add(lg.typeToTokenList.get(ttype));
        }
        if (t == IntStream.EOF) {
            hitEOF = true;
        }
    } while (ttype != Token.EOF);
    return tokenTypes;
}

Example 50 with ATN

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

the class BaseBrowserTest method checkRuleATN.

void checkRuleATN(Grammar g, String ruleName, String expecting) {
    ParserATNFactory f = new ParserATNFactory(g);
    ATN atn = f.createATN();
    DOTGenerator dot = new DOTGenerator(g);
    System.out.println(dot.getDOT(atn.ruleToStartState[g.getRule(ruleName).index]));
    Rule r = g.getRule(ruleName);
    ATNState startState = atn.ruleToStartState[r.index];
    ATNPrinter serializer = new ATNPrinter(g, startState);
    String result = serializer.asString();
    //System.out.print(result);
    assertEquals(expecting, result);
}