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Download and install ANTLR 3 from the ANTLR 3 page of the ANTLR website
2.
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Download and install AntlrWorks from the AntlrWorks page of the ANTLR website
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Run ANTLR 3 on a simple grammar
To be written. Volunteers?
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2.1 Create a simple grammar
To be written. Volunteers?
Java | | Code Block |
|---|
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 = 99; } ;
fragment DIGIT : '0'..'9' ;
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C# | | Code Block |
|---|
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 = 99; } ;
fragment DIGIT : '0'..'9' ;
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|---|
Objective-C | | Code Block |
|---|
grammar Simple;
options
{
language=ObjC;
}
OR : '||' ;
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C | | Code Block |
|---|
grammar Simple;
options
{
language=C;
}
OR : '||' ;
|
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|---|
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2.2 Run ANTLR 3 on the simple grammar
To be written. Volunteers?
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2.3 Revisit the simple grammar and learn basic ANTLR 3 syntax
To be written. Volunteers?
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Browse the list of questions frequently asked about ANTLR 3
Try the AntlrWorks IDE for ANTLR 3. AntlrWorks can be downloaded from the AntlrWorks page on the ANTLR website
Your five minutes are up!
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