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.

        "} : {"+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,"a",
      new CommonToken(ANTLRParser.ACTION,action),1);
    String found = translator.translate();
    assertEquals(expecting, found);

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        "} : {"+action+"}\n" +
        "  ;\n");
    Tool antlr = newTool();
    CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
    g.setCodeGenerator(generator);
    generator.genRecognizer(); // forces load of templates


    int expectedMsgID = ErrorManager.MSG_ISOLATED_RULE_ATTRIBUTE;
    Object expectedArg = "n";
    Object expectedArg2 = null;
    GrammarSemanticsMessage expectedMessage =

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        "b : {"+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, "b",
      new CommonToken(ANTLRParser.ACTION,action),1);
    String found = translator.translate();
    assertEquals(expecting, found);

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        "R : 'z' ID {"+action+"};" +
        "ID : 'a';\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 : 'z' ID {"+action+"};" +
        "ID : 'a';\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 : x='z' ;\n");


    Tool antlr = newTool();
    CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
    g.setCodeGenerator(generator);
    generator.genRecognizer(); // forces load of templates


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


  @Test public void testCharListLabelInLexer() throws Exception {

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        "R : x+='z' ;\n");


    Tool antlr = newTool();
    CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
    g.setCodeGenerator(generator);
    generator.genRecognizer(); // forces load of templates
    assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
  }


  @Test public void testWildcardCharLabelInLexer() throws Exception {
    ErrorQueue equeue = new ErrorQueue();

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        "R : x=. ;\n");


    Tool antlr = newTool();
    CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
    g.setCodeGenerator(generator);
    generator.genRecognizer(); // forces load of templates
    assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
  }


  @Test public void testWildcardCharListLabelInLexer() throws Exception {
    ErrorQueue equeue = new ErrorQueue();

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        "R : x+=. ;\n");


    Tool antlr = newTool();
    CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
    g.setCodeGenerator(generator);
    generator.genRecognizer(); // forces load of templates
    assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
  }


  @Test public void testMissingArgsInLexer() throws Exception {
    ErrorQueue equeue = new ErrorQueue();

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        "R[int i] : '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_MISSING_RULE_ARGS;
    Object expectedArg = "R";
    Object expectedArg2 = null;
    // getting a second error @1:12, probably from nextToken

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