#include <stdlib.h>
#include "transition.h"

TransitionPtr createTransition(CharClass,BitVectorPtr);
TransitionPtr appendTransition0(TransitionPtr,TransitionPtr);
TransitionPtr appendTransition(TransitionPtr,TransitionPtr);

TransitionPtr createTransition(CharClassPtr cc, BitVectorPtr state) {
    TransitionPtr transition = (TransitionPtr)malloc(sizeof(Transition));
    transition->condition = cc;
    transition->nextState = state;
    return transition;
}

TransitionPtr appendTransition0(TransitionPtr x, TransitionPtr y) {
    TransitionPtr x0 = x;
    for(;;) {
        if (x->next == NULL) {
            x->next = y;
            return x0;
        }
    }
    return x;
}

TransitionPtr appendTransition(TransitionPtr x, TransitionPtr y) {
    TransitionPtr x0 = createTransition(x->condition, x->nextState);
    TransitionPtr x1 = x0;
    for(;;) {
        if (x->next == NULL) {
            x1->next = y;
            return x0;
        }
        x = x->next;
        x1->next = createTransition(x->condition, x->nextState);
        x1 = x1->next;
    }
    return x0;
}