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Refactor: Merge KeyValue._code and _flags fields

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With a small number of flags now, it's possible to remove one more
field.
This commit is contained in:
Jules Aguillon 2022-06-05 19:55:55 +02:00
parent 5cc7fdf6d7
commit 088d46d6e6
1 changed files with 53 additions and 39 deletions
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92
srcs/juloo.keyboard2/KeyValue.java
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@ -47,40 +47,46 @@ class KeyValue
ARROW_RIGHT
}
// Behavior flags
public static final int FLAG_LATCH = 1;
public static final int FLAG_LOCK = (1 << 1);
// Special keys are not repeated and don't clear latched modifiers
public static final int FLAG_SPECIAL = (1 << 2);
public static final int FLAG_PRECISE_REPEAT = (1 << 4);
// Behavior flags.
public static final int FLAG_LATCH = (1 << 20);
public static final int FLAG_LOCK = (1 << 21);
// Special keys are not repeated and don't clear latched modifiers.
public static final int FLAG_SPECIAL = (1 << 22);
public static final int FLAG_PRECISE_REPEAT = (1 << 23);
// Rendering flags.
public static final int FLAG_KEY_FONT = (1 << 24);
public static final int FLAG_SMALLER_FONT = (1 << 25);
// Used by [Pointers].
public static final int FLAG_LOCKED = (1 << 26);
// Language specific keys that are removed from the keyboard by default.
public static final int FLAG_LOCALIZED = (1 << 27);
// Rendering flags
public static final int FLAG_KEY_FONT = (1 << 5);
public static final int FLAG_SMALLER_FONT = (1 << 6);
// Internal flags
public static final int FLAG_LOCKED = (1 << 7);
// Language specific keys that are removed from the keyboard by default
public static final int FLAG_LOCALIZED = (1 << 8);
// Kind flags
// Kinds
public static final int KIND_CHAR = (0 << 29);
public static final int KIND_STRING = (1 << 29);
public static final int KIND_KEYEVENT = (2 << 29);
public static final int KIND_EVENT = (3 << 29);
public static final int KIND_MODIFIER = (4 << 29);
public static final int KIND_FLAGS = (0b111 << 29);
// Ranges for the different components
private static final int FLAGS_BITS = (0b111111111 << 20); // 9 bits wide
private static final int KIND_BITS = (0b111 << 29); // 3 bits wide
private static final int VALUE_BITS = ~(FLAGS_BITS | KIND_BITS); // 20 bits wide
static
{
check((FLAGS_BITS & KIND_BITS) == 0); // No overlap
check((FLAGS_BITS | KIND_BITS | VALUE_BITS) == ~0); // No holes
}
public final String name;
private final String _symbol;
/** Describe what the key does when it isn't a simple character.
The meaning of this value depends on [_flags & KIND_FLAGS], which
corresponds to the [Kind] enum. */
/** This field encodes three things:
- The kind
- The flags
- The value for Char, Event and Modifier keys.
*/
private final int _code;
private final int _flags;
public static enum Kind
{
@ -89,7 +95,7 @@ class KeyValue
public Kind getKind()
{
switch (_flags & KIND_FLAGS)
switch (_code & KIND_BITS)
{
case KIND_CHAR: return Kind.Char;
case KIND_STRING: return Kind.String;
@ -102,12 +108,12 @@ class KeyValue
public int getFlags()
{
return _flags;
return (_code & FLAGS_BITS);
}
public boolean hasFlags(int has)
{
return ((_flags & has) != 0);
return ((_code & has) == has);
}
/** The string to render on the keyboard.
@ -120,62 +126,63 @@ class KeyValue
/** Defined only when [getKind() == Kind.Char]. */
public char getChar()
{
return (char)_code;
return (char)(_code & VALUE_BITS);
}
/** Defined only when [getKind() == Kind.Keyevent]. */
public int getKeyevent()
{
return _code;
return (_code & VALUE_BITS);
}
/** Defined only when [getKind() == Kind.Event]. */
public Event getEvent()
{
return Event.values()[_code];
return Event.values()[(_code & VALUE_BITS)];
}
/** Defined only when [getKind() == Kind.Modifier]. */
public Modifier getModifier()
{
return Modifier.values()[_code];
return Modifier.values()[(_code & VALUE_BITS)];
}
/* Update the char and the symbol. */
public KeyValue withChar(char c)
{
return new KeyValue(name, String.valueOf(c), KIND_CHAR, c, _flags);
return new KeyValue(name, String.valueOf(c), KIND_CHAR, c, getFlags());
}
public KeyValue withString(String s)
{
return new KeyValue(name, s, KIND_STRING, 0, _flags);
return new KeyValue(name, s, KIND_STRING, 0, getFlags());
}
public KeyValue withNameAndSymbol(String n, String s)
{
return new KeyValue(n, s, (_flags & KIND_FLAGS), _code, _flags);
return new KeyValue(n, s, (_code & KIND_BITS), (_code & VALUE_BITS), getFlags());
}
public KeyValue withKeyevent(int code)
{
return new KeyValue(name, _symbol, KIND_KEYEVENT, code, _flags);
return new KeyValue(name, _symbol, KIND_KEYEVENT, code, getFlags());
}
public KeyValue withFlags(int f)
{
return new KeyValue(name, _symbol, (_flags & KIND_FLAGS), _code, f);
return new KeyValue(name, _symbol, (_code & KIND_BITS), (_code & VALUE_BITS), f);
}
private static HashMap<String, KeyValue> keys = new HashMap<String, KeyValue>();
public KeyValue(String n, String s, int kind, int c, int f)
public KeyValue(String n, String s, int kind, int value, int flags)
{
assert((kind & ~KIND_FLAGS) == 0);
check((kind & ~KIND_BITS) == 0);
check((flags & ~FLAGS_BITS) == 0);
check((value & ~VALUE_BITS) == 0);
name = n;
_symbol = s;
_code = c;
_flags = (f & ~KIND_FLAGS) | kind;
_code = kind | flags | value;
}
private static String stripPrefix(String s, String prefix)
@ -197,7 +204,7 @@ class KeyValue
if (localized != null)
{
kv = getKeyByName(localized);
return kv.withFlags(kv._flags | FLAG_LOCALIZED);
return kv.withFlags(kv.getFlags() | FLAG_LOCALIZED);
}
if (name.length() == 1)
return new KeyValue(name, name, KIND_CHAR, name.charAt(0), 0);
@ -300,4 +307,11 @@ class KeyValue
addCharKey("space", "\r", ' ', FLAG_KEY_FONT);
addCharKey("nbsp", "\u237d", '\u00a0', FLAG_KEY_FONT | FLAG_SMALLER_FONT);
}
// Substitute for [assert], which has no effect on Android.
private static void check(boolean b)
{
if (!b)
throw new RuntimeException("Assertion failure");
}
}