Examples with IPDAState org.eclipse.xtext.grammaranalysis.IPDAState used on opensource projects

Example 1 with IPDAState

use of org.eclipse.xtext.grammaranalysis.IPDAState in project xtext-core by eclipse.

the class AbstractPDAProvider method getPDA.

/**
 * @since 2.0
 */
@Override
public IPDAState getPDA(CTX context) {
    PDAContext<CTX> ctx = createContext(context);
    ctx.start = createState(IPDAState.PDAStateType.START, null);
    ctx.stop = createState(IPDAState.PDAStateType.STOP, null);
    Set<Pair<Boolean, INFAState<?, ?>>> visited = Sets.newHashSet();
    ctx.start.followers = Sets.newHashSet();
    for (INFAState<?, ?> state : getStartFollowers(context)) {
        boolean targetCanReturn = !canEnterRuleCall(state);
        boolean targetReturning = !state.getOutgoingAfterReturn().isEmpty() && targetCanReturn;
        RuleCallStackElement stack = new RuleCallStackElement(null, null);
        IPDAState s = createState(ctx, stack, state, null, targetReturning, targetCanReturn, visited);
        if (s != null)
            ctx.start.followers.add(s);
    }
    return ctx.start;
}