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package juloo.keyboard2;
import java.util.Arrays;
public final class ComposeKey
{
/** Apply the pending compose sequence to [kv]. */
public static KeyValue apply(int state, KeyValue kv)
{
switch (kv.getKind())
{
case Char:
KeyValue res = apply(state, kv.getChar());
// Grey-out characters not part of any sequence.
if (res == null)
return kv.withFlags(kv.getFlags() | KeyValue.FLAG_GREYED);
return res;
/* These keys are not greyed. */
case Event:
case Modifier:
case Compose_pending:
return kv;
/* Other keys cannot be part of sequences. */
default:
return kv.withFlags(kv.getFlags() | KeyValue.FLAG_GREYED);
}
}
/** Apply the pending compose sequence to char [c]. */
static KeyValue apply(int state, char c)
{
char[] states = ComposeKeyData.states;
char[] edges = ComposeKeyData.edges;
int length = edges[state];
int next = Arrays.binarySearch(states, state + 1, state + length, c);
if (next < 0)
return null;
next = edges[next];
// The next state is the end of a sequence, show the result.
if (edges[next] == 1)
return KeyValue.makeCharKey(states[next]);
return KeyValue.makeComposePending(String.valueOf(c), next, 0);
}
/** The [states] array represents the different states and their transition.
A state occupies one or several cells of the array:
- The first cell is the result of the compose sequence if the state is of
size 1, unspecified otherwise.
- The remaining cells are the transitions, sorted alphabetically.
The [edges] array represents the transition state corresponding to each
accepted inputs.
Id [states[i]] is the first cell of a state, [edges[i]] is the number of
cells occupied by the state [i].
If [states[i]] is a transition, [edges[i]] is the index of the state to
jump into. */
}
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