Examples with ATNConfigSet org.antlr.v4.runtime.atn.ATNConfigSet used on opensource projects

Example 21 with ATNConfigSet

use of org.antlr.v4.runtime.atn.ATNConfigSet in project antlr4 by tunnelvisionlabs.

the class LexerATNSimulator method addDFAEdge.

@NotNull
protected DFAState addDFAEdge(@NotNull DFAState from, int t, @NotNull ATNConfigSet q) {
    /* leading to this call, ATNConfigSet.hasSemanticContext is used as a
		 * marker indicating dynamic predicate evaluation makes this edge
		 * dependent on the specific input sequence, so the static edge in the
		 * DFA should be omitted. The target DFAState is still created since
		 * execATN has the ability to resynchronize with the DFA state cache
		 * following the predicate evaluation step.
		 *
		 * TJP notes: next time through the DFA, we see a pred again and eval.
		 * If that gets us to a previously created (but dangling) DFA
		 * state, we can continue in pure DFA mode from there.
		 */
    boolean suppressEdge = q.hasSemanticContext();
    if (suppressEdge) {
        q.clearExplicitSemanticContext();
    }
    @NotNull DFAState to = addDFAState(q);
    if (suppressEdge) {
        return to;
    }
    addDFAEdge(from, t, to);
    return to;
}