Examples of org.antlr.codegen.CodeGenerator

org.antlr.codegen.CodeGenerator
ANTLR's code generator. Generate recognizers derived from grammars. Language independence achieved through the use of STGroup objects. All output strings are completely encapsulated in the group files such as Java.stg. Some computations are done that are unused by a particular language. This generator just computes and sets the values into the templates; the templates are free to use or not use the information. To make a new code generation target, define X.stg for language X by copying from existing Y.stg most closely releated to your language; e.g., to do CSharp.stg copy Java.stg. The template group file has a bunch of templates that are needed by the code generator. You can add a new target w/o even recompiling ANTLR itself. The language=X option in a grammar file dictates which templates get loaded/used. Some language like C need both parser files and header files. Java needs to have a separate file for the cyclic DFA as ANTLR generates bytecodes directly (which cannot be in the generated parser Java file). To facilitate this, cyclic can be in same file, but header, output must be searpate. recognizer is in outptufile.

      "parser grammar t;\n"+
        "a[User u, int i]\n" +
        "        : 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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      "parser grammar t;\n"+
        "a[boolean b]\n" +
        "        : 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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    assertEquals("attribute mismatch","HashMap<String,String> foo",attrs.get(0).decl.toString());
    assertEquals("parameter name mismatch","foo",attrs.get(0).name);
    assertEquals("declarator mismatch", "HashMap<String,String>", attrs.get(0).type);


    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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    assertEquals("attribute mismatch","List<String> duh",attrs.get(2).decl.toString().trim());
    assertEquals("parameter name mismatch","duh",attrs.get(2).name);
    assertEquals("declarator mismatch", "List<String>", attrs.get(2).type);


    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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      "parser grammar t;\n"+
        "a[User u, int i]\n" +
        "        : 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 found = translator.translate();    assertEquals(expecting, found);


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

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    Grammar g = new Grammar(
      "parser grammar t;\n"+
        "a : x=b {"+action+"} ;\n" +
        "b returns [int foo] : B {$b.start} ;\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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      "parser grammar t;\n"+
        "a : x=b {###"+action+"!!!} ;\n" +
        "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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      "parser grammar t;\n"+
        "a[User u, int i]\n" +
        "        : {"+action+"}\n" +
        "        ;");
    Tool antlr = newTool();
    CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
    ActionTranslator translator = new ActionTranslator(generator,
      "a",
      new CommonToken(ANTLRParser.ACTION,action),1);
    String found = translator.translate();
    assertEquals(expecting, found);

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        "a returns [int i]\n" +
        "        : 'a'\n" +
        "        ;\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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      "options {backtrack=true;}\n" +
      "   : 'a' {"+action+"}\n" +
      "   | '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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Related Classes of org.antlr.codegen.CodeGenerator

antlr.TokenStreamRewriteEngine

org.antlr.analysis.DFA

org.antlr.grammar.v3.ActionTranslator

org.antlr.grammar.v3.ANTLRLexer

org.antlr.grammar.v3.ANTLRParser

org.antlr.grammar.v3.CodeGenTreeWalker

org.antlr.misc.BitSet

org.antlr.runtime.tree.CommonTreeNodeStream

org.antlr.test.TestAttributes

org.antlr.test.TestCharDFAConversion

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