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grammar t044trace;
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options {
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language = Python;
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}
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@init {
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self._stack = None
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}
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a: '<' ((INT '+')=>b|c) '>';
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b: c ('+' c)*;
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c: INT
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{
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if self._stack is None:
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self._stack = self.getRuleInvocationStack()
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}
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;
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INT: ('0'..'9')+;
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WS: (' ' | '\n' | '\t')+ {$channel = HIDDEN;};
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