Examples of org.antlr.tool.Interpreter

org.antlr.tool.Interpreter
The recognition interpreter/engine for grammars. Separated out of Grammar as it's related, but technically not a Grammar function. You create an interpreter for a grammar and an input stream. This object can act as a TokenSource so that you can hook up two grammars (via a CommonTokenStream) to lex/parse. Being a token source only makes sense for a lexer grammar of course.

        Grammar lexer = eg.getLexerGrammar();
        if(lexer == null) {
            throw new RuntimeException("Lexer is null. Check the grammar before running the interpreterTab.");
        }


        Interpreter lexEngine = new CustomInterpreter(lexer, input);




        FilteringTokenStream tokens = new FilteringTokenStream(lexEngine);


        StringTokenizer tk = new StringTokenizer(tokensToIgnoreLabel.getText(), " ");
        while ( tk.hasMoreTokens() ) {
            String tokenName = tk.nextToken();
            tokens.setTokenTypeChannel(lexer.getTokenType(tokenName), Token.HIDDEN_CHANNEL);
        }


        Interpreter parseEngine = new CustomInterpreter(parser, tokens);


        ParseTree t = null;
        try {
            if(ATEToken.isLexerName(startSymbol)) {
                t = lexEngine.parse(startSymbol);
            } else {
                t = parseEngine.parse(startSymbol);
            }
        } catch (Exception e) {
            window.consoleTab.println(e);
        }

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      "lexer grammar t;\n"+
      "A : 'a';\n" +
      "B : 'b';\n" +
      "C : 'c';\n");
    CharStream input = new ANTLRStringStream("abc");
    Interpreter lexEngine = new Interpreter(g, input);
    TokenRewriteStream tokens = new TokenRewriteStream(lexEngine);
    tokens.insertBefore(0, "0");
    String result = tokens.toString();
    String expecting = "0abc";
    assertEquals(expecting, result);

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      "lexer grammar t;\n"+
      "A : 'a';\n" +
      "B : 'b';\n" +
      "C : 'c';\n");
    CharStream input = new ANTLRStringStream("abc");
    Interpreter lexEngine = new Interpreter(g, input);
    TokenRewriteStream tokens = new TokenRewriteStream(lexEngine);
    tokens.insertAfter(2, "x");
    String result = tokens.toString();
    String expecting = "abcx";
    assertEquals(expecting, result);

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      "lexer grammar t;\n"+
      "A : 'a';\n" +
      "B : 'b';\n" +
      "C : 'c';\n");
    CharStream input = new ANTLRStringStream("abc");
    Interpreter lexEngine = new Interpreter(g, input);
    TokenRewriteStream tokens = new TokenRewriteStream(lexEngine);
    tokens.fill();
    tokens.insertBefore(1, "x");
    tokens.insertAfter(1, "x");
    String result = tokens.toString();

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      "lexer grammar t;\n"+
      "A : 'a';\n" +
      "B : 'b';\n" +
      "C : 'c';\n");
    CharStream input = new ANTLRStringStream("abc");
    Interpreter lexEngine = new Interpreter(g, input);
    TokenRewriteStream tokens = new TokenRewriteStream(lexEngine);
    tokens.fill();
    tokens.replace(0, "x");
    String result = tokens.toString();
    String expecting = "xbc";

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      "lexer grammar t;\n"+
      "A : 'a';\n" +
      "B : 'b';\n" +
      "C : 'c';\n");
    CharStream input = new ANTLRStringStream("abc");
    Interpreter lexEngine = new Interpreter(g, input);
    TokenRewriteStream tokens = new TokenRewriteStream(lexEngine);
    tokens.fill();
    tokens.replace(2, "x");
    String result = tokens.toString();
    String expecting = "abx";

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      "lexer grammar t;\n"+
      "A : 'a';\n" +
      "B : 'b';\n" +
      "C : 'c';\n");
    CharStream input = new ANTLRStringStream("abc");
    Interpreter lexEngine = new Interpreter(g, input);
    TokenRewriteStream tokens = new TokenRewriteStream(lexEngine);
    tokens.fill();
    tokens.replace(1, "x");
    String result = tokens.toString();
    String expecting = "axc";

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            "ASSIGN : '=';\n" +
            "WS : ' '+;\n");
        // Tokens: 0123456789
        // Input:  x = 3 * 0;
        CharStream input = new ANTLRStringStream("x = 3 * 0;");
        Interpreter lexEngine = new Interpreter(g, input);
        TokenRewriteStream tokens = new TokenRewriteStream(lexEngine);
        tokens.fill();
        tokens.replace(4, 8, "0"); // replace 3 * 0 with 0


        String result = tokens.toOriginalString();

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            "MULT : '*';\n" +
            "WS : ' '+;\n");
        // Tokens: 012345678901234567
        // Input:  x = 3 * 0 + 2 * 0;
        CharStream input = new ANTLRStringStream("x = 3 * 0 + 2 * 0;");
        Interpreter lexEngine = new Interpreter(g, input);
        TokenRewriteStream tokens = new TokenRewriteStream(lexEngine);
        tokens.fill();


        String result = tokens.toOriginalString();
        String expecting = "x = 3 * 0 + 2 * 0;";

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      "lexer grammar t;\n"+
      "A : 'a';\n" +
      "B : 'b';\n" +
      "C : 'c';\n");
    CharStream input = new ANTLRStringStream("abc");
    Interpreter lexEngine = new Interpreter(g, input);
    TokenRewriteStream tokens = new TokenRewriteStream(lexEngine);
    tokens.fill();
    tokens.replace(1, "x");
    tokens.replace(1, "y");
    String result = tokens.toString();

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Related Classes of org.antlr.tool.Interpreter

org.antlr.analysis.DFA

org.antlr.runtime.debug.ParseTreeBuilder

org.antlr.test.TestCommonTokenStream

org.antlr.test.TestInterpretedLexing

org.antlr.test.TestInterpretedParsing

org.antlr.test.TestTokenRewriteStream

org.antlr.works.interpreter.InterpreterTab

java.util.Stack

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