Examples of org.antlr.codegen.CodeGenerator.genRecognizer()

org.antlr.codegen.CodeGenerator.genRecognizer()
Given the grammar to which we are attached, walk the AST associated with that grammar to create NFAs. Then create the DFAs for all decision points in the grammar by converting the NFAs to DFAs. Finally, walk the AST again to generate code. Either 1 or 2 files are written: recognizer: the main parser/lexer/treewalker item header file: language like C/C++ need extern definitions The target, such as JavaTarget, dictates which files get written.

      "lexer grammar t;\n"+
        "R : 'r' {"+action+"};\n");
    Tool antlr = newTool();
    CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
    g.setCodeGenerator(generator);
    generator.genRecognizer(); // forces load of templates
    ActionTranslator translator =
      new ActionTranslator(generator,
        "R",
        new CommonToken(ANTLRParser.ACTION,action),1);
    String found = translator.translate();

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        "R : a='c' b='hi' c=. d=DUH {"+action+"};\n" +
        "DUH : 'd' ;\n");
    Tool antlr = newTool();
    CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
    g.setCodeGenerator(generator);
    generator.genRecognizer(); // forces load of templates
    ActionTranslator translator =
      new ActionTranslator(generator,
        "R",
        new CommonToken(ANTLRParser.ACTION,action),1);
    String found = translator.translate();

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      "lexer grammar t;\n"+
        "R : 'r' {"+action+"};\n");
    Tool antlr = newTool();
    CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
    g.setCodeGenerator(generator);
    generator.genRecognizer(); // forces load of templates
    ActionTranslator translator =
      new ActionTranslator(generator,
        "R",
        new CommonToken(ANTLRParser.ACTION,action),1);
    String found = translator.translate();

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    Tool antlr = newTool();
    antlr.setOutputDirectory(null); // write to /dev/null
    CodeGenerator generator = new CodeGenerator(antlr, lexerGrammar, "Java");
    lexerGrammar.setCodeGenerator(generator);
    generator.genRecognizer();


    int expectedMsgID = ErrorManager.MSG_RULE_HAS_NO_ARGS;
    Object expectedArg = "ID";
    Object expectedArg2 = null;
    GrammarSemanticsMessage expectedMessage =

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    Tool antlr = newTool();
    antlr.setOutputDirectory(null); // write to /dev/null
    CodeGenerator generator = new CodeGenerator(antlr, lexerGrammar, "Java");
    lexerGrammar.setCodeGenerator(generator);
    generator.genRecognizer();


    int expectedMsgID = ErrorManager.MSG_MISSING_RULE_ARGS;
    Object expectedArg = "ID";
    Object expectedArg2 = null;
    GrammarSemanticsMessage expectedMessage =

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    ActionTranslator translator =
      new ActionTranslator(generator,
        "a",
        new CommonToken(ANTLRParser.ACTION,action),1);
    g.setCodeGenerator(generator);
    generator.genRecognizer(); // forces load of templates
    String found = translator.translate();
    assertEquals(expecting, found);


    assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
  }

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        "ID : 'a';\n");
    Tool antlr = newTool();
    antlr.setOutputDirectory(null); // write to /dev/null
    CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
    g.setCodeGenerator(generator);
    generator.genRecognizer();


    ActionTranslator translator = new ActionTranslator(generator,"a",
      new CommonToken(ANTLRParser.ACTION,action),1);
    String found = translator.translate();
    assertEquals(expecting, found);

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        "ID : 'a';\n");
    Tool antlr = newTool();
    antlr.setOutputDirectory(null); // write to /dev/null
    CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
    g.setCodeGenerator(generator);
    generator.genRecognizer();


    int expectedMsgID = ErrorManager.MSG_NONUNIQUE_REF;
    Object expectedArg = "ID";
    GrammarSemanticsMessage expectedMessage =
      new GrammarSemanticsMessage(expectedMsgID, g, null, expectedArg);

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        "ID : 'a';\n");
    Tool antlr = newTool();
    antlr.setOutputDirectory(null); // write to /dev/null
    CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
    g.setCodeGenerator(generator);
    generator.genRecognizer();


    int expectedMsgID = ErrorManager.MSG_NONUNIQUE_REF;
    Object expectedArg = "ID";
    GrammarSemanticsMessage expectedMessage =
      new GrammarSemanticsMessage(expectedMsgID, g, null, expectedArg);

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        "    :   'y' {"+action+"}\n" +
        "    ;\n");
    Tool antlr = newTool();
    CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
    g.setCodeGenerator(generator);
    generator.genRecognizer(); // forces load of templates
    ActionTranslator translator = new ActionTranslator(generator,
      "field",
      new CommonToken(ANTLRParser.ACTION,action),1);
    String found = translator.translate();
    assertEquals(expecting, found);

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