mirror of
https://github.com/Julow/Unexpected-Keyboard.git
synced 2024-11-22 15:23:11 +01:00
a886f6eede
Encoding errors in the compose data compiler due to: - 'UTF-16' adds a BOM, use 'UTF-16-LE' instead - 'str.encode' returns a byte array, use 'array' to have a 16-bit char array.
75 lines
2.6 KiB
Java
75 lines
2.6 KiB
Java
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 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.makeStringKey(
|
|
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. */
|
|
}
|