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.

        "b : B ;\n");
    Tool antlr = newTool();


    CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
    g.setCodeGenerator(generator);
    generator.genRecognizer(); // codegen phase sets some vars we need
    ST codeST = generator.getRecognizerST();
    String code = codeST.render();
    String found = code.substring(code.indexOf("###")+3,code.indexOf("!!!"));
    assertEquals(expecting, found);
    assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());

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        "        ;\n" +
        "b : x=a {"+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,
        "b",
        new CommonToken(ANTLRParser.ACTION,action),1);
    String found =  translator.translate();

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      "   | 'a'\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();

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        "        ;\n" +
        "b : x=a {"+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,
        "b",
        new CommonToken(ANTLRParser.ACTION,action),1);
    String found = translator.translate();

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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);

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        ":  bar='bar' { $obj = $bar.text; }\n"+
        ";");
    Tool antlr = newTool();
    CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
    g.setCodeGenerator(generator);
    generator.genRecognizer(); // forces load of templates
    int i = 0;
    String action = action1;
    String expecting = expecting1;
    do {
      ActionTranslator translator = new ActionTranslator(generator,"rule1",

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        "a : id=ID f=FLOAT {"+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);

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        "  ;");
    Tool antlr = newTool();
    antlr.setOutputDirectory(null); // write to /dev/null
    CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
    g.setCodeGenerator(generator);
    generator.genRecognizer(); // codegen phase sets some vars we need
    ST codeST = generator.getRecognizerST();
    String code = codeST.render();
    String found = code.substring(code.indexOf("###")+3,code.indexOf("!!!"));
    assertEquals(expecting, found);

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        "a : A a {$a.text} | B ;");
    Tool antlr = newTool();
    antlr.setOutputDirectory(null); // write to /dev/null
    CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
    g.setCodeGenerator(generator);
    generator.genRecognizer();


    // error(132): <string>:2:9: reference $a is ambiguous; rule a is enclosing rule and referenced in the production
    assertEquals("unexpected errors: "+equeue, 1, equeue.errors.size());
  }

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        "  ;");
    Tool antlr = newTool();
    antlr.setOutputDirectory(null); // write to /dev/null
    CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
    g.setCodeGenerator(generator);
    generator.genRecognizer(); // codegen phase sets some vars we need


    ST codeST = generator.getRecognizerST();
    String code = codeST.render();
    String found = code.substring(code.indexOf("###")+3,code.indexOf("!!!"));
    assertEquals(expecting, found);

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