public int getOffset() {
		return offset;
	}
Gets the location in the input {@link CharStream} at which the lexer
action should be executed. The value is interpreted as an offset relative
to the token start index.

@return The location in the input {@link CharStream} at which the lexer
action should be executed.
runtime/Java/src/org/antlr/v4/runtime/atn/LexerIndexedCustomAction.java