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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]. */
public static KeyValue apply(int prev, char c)
{
char[] states = ComposeKeyData.states;
char[] edges = ComposeKeyData.edges;
int prev_length = edges[prev];
int next = Arrays.binarySearch(states, prev + 1, prev + prev_length, c);
if (next < 0)
return null;
next = edges[next];
int next_header = states[next];
if (next_header == 0) // Enter a new intermediate state.
return KeyValue.makeComposePending(String.valueOf(c), next, 0);
else if (next_header == 0xFFFF) // String final state
{
int next_length = edges[next];
return KeyValue.getKeyByName(
new String(states, next + 1, next_length - 1));
}
else // Character final state.
return KeyValue.makeCharKey((char)next_header);
}
/** The state machine is comprised of two arrays.
The [states] array represents the different states and the associated
transitions:
- The first cell is the header cell, [states[s]].
- If the header is equal to [0],
The remaining cells are the transitions characters, sorted
alphabetically.
- If the header is positive,
This is a final state, [states[s]] is the result of the sequence.
In this case, [edges[s]] must be equal to [1].
- If the header is equal to [-1],
This is a final state, the remaining cells represent the result string
which starts at index [s + 1] and has a length of [edges[s] - 1].
The [edges] array represents the transition state corresponding to each
accepted inputs.
- If [states[s]] is a header cell, [edges[s]] is the number of cells
occupied by the state [s], including the header cell.
- If [states[s]] is a transition, [edges[s]] is the index of the state to
jump into.
- If [states[s]] is a part of a final state, [edges[s]] is not used. */
}
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