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.

            if (isGenerate_NFA_dot()) {
                generateNFAs(grammar);
            }


            // GENERATE CODE
            generator.genRecognizer();


            if (isGenerate_DFA_dot()) {
                generateDFAs(grammar);
            }

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    Grammar g = new Grammar(grammarStr);


    Tool antlr = newTool();
    CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
    g.setCodeGenerator(generator);
    ST recogST = generator.genRecognizer();
    String code = recogST.render();
    assertTrue("not expecting label", code.indexOf("x=b();")<0);


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

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      "    : other=otherrule {" + 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,
                                  "rule",
                                  new CommonToken(ANTLRParser.ACTION,action),1);
    String rawTranslation =
      translator.translate();

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


        assertEquals("unexpected errors: "+equeue, 1, equeue.errors.size());


        int expectedMsgID = ErrorManager.MSG_WILDCARD_AS_ROOT;
        Object expectedArg = null;

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        "        : {"+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,
        "a",
        new CommonToken(ANTLRParser.ACTION,action),0);
    String found = translator.translate();    assertEquals(expecting, found);

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


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

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        "        : A a["+action+"] B\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 rawTranslation =  translator.translate();
    assertEquals(expecting, rawTranslation);

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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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        "b : ID {$Symbols::x=$ID.text} ;\n" +
        "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,"a",
      new CommonToken(ANTLRParser.ACTION,action),1);
    String found = translator.translate();
    assertEquals(expecting, found);

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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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