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package juloo.keyboard2;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
class ExtraKeys
{
public static final ExtraKeys EMPTY = new ExtraKeys(Collections.EMPTY_LIST);
Collection<ExtraKey> _ks;
public ExtraKeys(Collection<ExtraKey> ks)
{
_ks = ks;
}
/** Add the keys that should be added to the keyboard into [dst]. Keys
already added to [dst] might have an impact, see [ExtraKey.compute]. */
public void compute(Set<KeyValue> dst, Query q)
{
for (ExtraKey k : _ks)
k.compute(dst, q);
}
public static ExtraKeys parse(String script, String str)
{
Collection<ExtraKey> dst = new ArrayList<ExtraKey>();
String[] ks = str.split("\\|");
for (int i = 0; i < ks.length; i++)
dst.add(ExtraKey.parse(ks[i], script));
return new ExtraKeys(dst);
}
/** Merge identical keys. This is required to decide whether to add
alternatives. Script is generalized (set to null) on any conflict. */
public static ExtraKeys merge(List<ExtraKeys> kss)
{
Map<KeyValue, ExtraKey> merged_keys = new HashMap<KeyValue, ExtraKey>();
for (ExtraKeys ks : kss)
for (ExtraKey k : ks._ks)
{
ExtraKey k2 = merged_keys.get(k.kv);
if (k2 != null)
k = k.merge_with(k2);
merged_keys.put(k.kv, k);
}
return new ExtraKeys(merged_keys.values());
}
final static class ExtraKey
{
/** The key to add. */
final KeyValue kv;
/** The key will be added to layouts of the same script. If null, might be
added to layouts of any script. */
final String script;
/** The key will not be added to layout that already contain all the
alternatives. */
final List<KeyValue> alternatives;
ExtraKey(KeyValue kv_, String script_, List<KeyValue> alts_)
{
kv = kv_;
script = script_;
alternatives = alts_;
}
/** Whether the key should be added to the keyboard. */
public void compute(Set<KeyValue> dst, Query q)
{
// Add the alternative if it's the only one. The list of alternatives is
// enforced to be complete by the merging step. The same [kv] will not
// appear again in the list of extra keys with a different list of
// alternatives.
// Selecting the dead key in the "Add key to the keyboard" option would
// disable this behavior for a key.
boolean use_alternative = (alternatives.size() == 1 && !dst.contains(kv));
if
((q.script == null || script == null || q.script.equals(script))
&& (alternatives.size() == 0 || !q.present.containsAll(alternatives)))
dst.add(use_alternative ? alternatives.get(0) : kv);
}
/** Return a new key from two. [kv] are expected to be equal. [script] is
generalized to [null] on any conflict. [alternatives] are concatenated.
*/
public ExtraKey merge_with(ExtraKey k2)
{
String script_ =
(script != null && k2.script != null && script.equals(k2.script))
? script : null;
List<KeyValue> alts = new ArrayList<KeyValue>(alternatives);
alts.addAll(k2.alternatives);
return new ExtraKey(kv, script_, alts);
}
/** Extra keys are of the form "key name" or "key name:alt 1:alt 2". */
public static ExtraKey parse(String str, String script)
{
String[] strs = str.split(":");
KeyValue kv = KeyValue.getKeyByName(strs[0]);
KeyValue[] alts = new KeyValue[strs.length-1];
for (int i = 1; i < strs.length; i++)
alts[i-1] = KeyValue.getKeyByName(strs[i]);
return new ExtraKey(kv, script, Arrays.asList(alts));
}
}
public final static class Query
{
/** Script of the current layout. Might be null. */
final String script;
/** Keys present on the layout. */
final Set<KeyValue> present;
public Query(String script_, Set<KeyValue> present_)
{
script = script_;
present = present_;
}
}
}
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