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When it was released, PCCTS supported C as it's only target language, but through consulting with NeXT Computer, PCCTS supported C++ after 1994. It's immediate successor ANTLR 2 supported Java, C# and Python in addition to C+. Although it is still in beta, ANTLR 3 has already demonstrated support for Java, C#, Objective-C, C, C+ and Ruby as target languages. As of July 2006, the Java target is complete and the C#, Objective C, Ruby and C targets are nearly complete. Support for additional target languages including C++, Perl6 and Oberon (yes, Oberon) is either expected or already in progress.
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Java | | Code Block |
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grammar SimpleCalc;
tokens {
PLUS = '+' ;
MINUS = '-' ;
MULT = '*' ;
DIV = '/' ;
}
@members {
public static void main(String[] args) throws Exception {
SimpleCalcLexer lex = new SimpleCalcLexer(new ANTLRFileStream(args[0]));
CommonTokenStream tokens = new CommonTokenStream(lex);
SimpleCalc parser = new SimpleCalc(tokens);
try {
parser.expr();
} catch (RecognitionException e) {
e.printStackTrace();
}
}
}
/*------------------------------------------------------------------
* PARSER RULES
*------------------------------------------------------------------*/
expr : term ( ( PLUS | MINUS ) term )* ;
term : factor ( ( MULT | DIV ) factor )* ;
factor : NUMBER ;
/*------------------------------------------------------------------
* LEXER RULES
*------------------------------------------------------------------*/
NUMBER : (DIGIT)+ ;
WHITESPACE : ( '\t' | ' ' | '\r' | '\n'| '\u000C' )+ { $channel = HIDDEN; } ;
fragment DIGIT : '0'..'9' ;
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C# | | Code Block |
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grammar SimpleCalc;
options {
language=CSharp;
}
tokens {
PLUS = '+' ;
MINUS = '-' ;
MULT = '*' ;
DIV = '/' ;
}
@members {
public static void Main(string[] args) {
SimpleCalcLexer lex = new SimpleCalcLexer(new ANTLRFileStream(args[0]));
CommonTokenStream tokens = new CommonTokenStream(lex);
SimpleCalc parser = new SimpleCalc(tokens);
try {
parser.expr();
} catch (RecognitionException e) {
Console.Error.WriteLine(e.StackTrace);
}
}
}
/*------------------------------------------------------------------
* PARSER RULES
*------------------------------------------------------------------*/
expr : term ( ( PLUS | MINUS ) term )* ;
term : factor ( ( MULT | DIV ) factor )* ;
factor : NUMBER ;
/*------------------------------------------------------------------
* LEXER RULES
*------------------------------------------------------------------*/
NUMBER : (DIGIT)+ ;
WHITESPACE : ( '\t' | ' ' | '\r' | '\n'| '\u000C' )+ { $channel = HIDDEN; } ;
fragment DIGIT : '0'..'9' ;
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Objective-C |
To be written. Volunteers?
| Code Block |
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grammar SimpleCalc;
options
{
language=ObjC;
}
OR : '||' ;
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C |
OK very simple example done - this will work, but don't know if it is the 'best' simple example.
| Code Block |
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grammar SimpleCalc;
options
{
language=C;
}
tokens {
PLUS = '+' ;
MINUS = '-' ;
MULT = '*' ;
DIV = '/' ;
}
@members { int main(int argc, char * argv[])
{ pSimpleCalcLexer lex = SimpleCalcLexerNew(antlr3AsciiFileStreamNew(argv[1])); pANTLR3_COMMON_TOKEN_STREAM tokens = antlr3CommonTokenStreamSourceNew(ANTLR3_SIZE_HINT, lex->pLexer->tokSource); pSimpleCalcParser parser = SimpleCalcParserNew(tokens); parser->expr(parser); } }
/*------------------------------------------------------------------
* PARSER RULES
*------------------------------------------------------------------*/
expr : term ( ( PLUS | MINUS ) term )* ;
term : factor ( ( MULT | DIV ) factor )* ;
factor : NUMBER ;
/*------------------------------------------------------------------
* LEXER RULES
*------------------------------------------------------------------*/
NUMBER : (DIGIT)+ ;
WHITESPACE : ( '\t' | ' ' | '\r' | '\n'| '\u000C' )+ { $channel = HIDDEN; } ;
fragment DIGIT : '0'..'9' ;
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