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.

    Grammar g = new Grammar(
      "lexer grammar t;\n"+
        "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());
  }

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    Grammar g = new Grammar(
      "lexer grammar t;\n"+
        "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());
  }

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    Grammar g = new Grammar(
      "lexer grammar t;\n"+
        "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());
  }

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      "lexer grammar t;\n"+
        "A : R ;" +
        "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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    ErrorManager.setErrorListener(equeue);
    Grammar g = new Grammar(
      "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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    Grammar g = new Grammar(
      "lexer grammar t;\n"+
        "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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    ErrorManager.setErrorListener(equeue);
    Grammar g = new Grammar(
      "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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    lexerGrammar.checkNameSpaceAndActions();
    sr.close();


    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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    lexerGrammar.checkNameSpaceAndActions();
    sr.close();


    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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        "a : id=ID {"+action+"} ;\n" +
        "ID : 'a';\n");


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