1grammar t044trace;
2options {
3  language = Python;
4}
5
6@init {
7    self._stack = None
8}
9
10a: '<' ((INT '+')=>b|c) '>';
11b: c ('+' c)*;
12c: INT
13    {
14        if self._stack is None:
15            self._stack = self.getRuleInvocationStack()
16    }
17    ;
18
19INT: ('0'..'9')+;
20WS: (' ' | '\n' | '\t')+ {$channel = HIDDEN;};
21