How many children does a node have?

Returns the children of a RuleNode.

A stateful error listener which accretes parse errors in a deref-able structure. Deref returns nil if there are no errors; else a sequence of heterogenous maps, depending on what debugging information is available.

Like (keyword str), but faster.

A map of strings to keywords.

Constructs a new ParseError exception with a list of errors.

Given a parser and an integer rule index, returns the string name of that rule. Negative indexes map to nil.

Converts a RecognitionException to a nice readable map.