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copied!<p>You don't have a parser rule (parser rules start with a lower case letter), although I'm not sure that last part is necessary when interpreting some test cases in ANTLRWorks.</p> <p>Anyway, try something like this:</p> <pre><code>grammar AdifyMapReducePredicate; parse : (p=predicate {System.out.println("parsed :: "+$p.text);})+ EOF ; predicate : expression ; expression : booleanExpression ; booleanExpression : atom ((AND | OR) atom)* ; atom : ID | '(' predicate ')' ; AND : '&&' ; OR : '||' ; ID : ('a'..'z'|'A'..'Z'|'_') ('a'..'z'|'A'..'Z'|'0'..'9'|'_')* ; SPACE : (' ' | '\t' | '\r' | '\n') {skip();} ; </code></pre> <p>With the following test class:</p> <pre><code>import org.antlr.runtime.*; import org.antlr.runtime.tree.*; import org.antlr.stringtemplate.*; public class Main { public static void main(String[] args) throws Exception { ANTLRStringStream in = new ANTLRStringStream("(A || B) (C && (D || F || G))"); AdifyMapReducePredicateLexer lexer = new AdifyMapReducePredicateLexer(in); CommonTokenStream tokens = new CommonTokenStream(lexer); AdifyMapReducePredicateParser parser = new AdifyMapReducePredicateParser(tokens); parser.parse(); } } </code></pre> <p>which after generating a lexer & parser (a), compiling all <code>.java</code> files (b) and running the test class (c), produces the following output:</p> <pre> parsed :: (A||B) parsed :: (C&&(D||F||G)) </pre> <h2>a</h2> <pre> java -cp antlr-3.2.jar org.antlr.Tool AdifyMapReducePredicate.g </pre> <h2>b</h2> <pre> javac -cp antlr-3.2.jar *.java </pre> <h2>c (*nix/MacOS)</h2> <pre> java -cp .:antlr-3.2.jar Main </pre> <h2>c (Windows)</h2> <pre> java -cp .;antlr-3.2.jar Main </pre> <p>HTH</p>

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