private void changeCase(@NonNull Button button) {
final boolean upperCase = button.getText().equals("↑");
App.processViewsOfType(
user.getKeyboard(),
Button.class,
new App.ViewProcessor<Button>() {
@Override
public void process(@Nonnull Button key) {
final String letter = key.getText().toString();
if (!ALPHABET.contains(letter.toLowerCase(Locale.US))) {
return;
}
if (upperCase) {
key.setText(letter.toUpperCase(Locale.US));
} else {
key.setText(letter.toLowerCase(Locale.US));
}
}
});
if (upperCase) {
button.setText("↓");
} else {
button.setText("↑");
}
}
@Nonnull
public static Result getType(
@Nonnull String text,
int i,
boolean hexMode,
@Nonnull Result result,
@Nonnull Engine engine) {
if (i < 0) {
throw new IllegalArgumentException("I must be more or equals to 0.");
} else if (i >= text.length() && i != 0) {
throw new IllegalArgumentException("I must be less than size of text.");
} else if (i == 0 && text.length() == 0) {
return result.set(MathType.text, text);
}
final List<MathType> mathTypes = getMathTypesByPriority();
for (int j = 0; j < mathTypes.size(); j++) {
final MathType mathType = mathTypes.get(j);
final String s = App.find(mathType.getTokens(engine), text, i);
if (s == null) {
continue;
}
if (s.length() > 1) {
if (mathType == function) {
final int nextToken = i + s.length();
if (nextToken < text.length()) {
// function must have an open group symbol after its name
if (MathType.open_group_symbol
.getTokens()
.contains(text.substring(nextToken, nextToken + 1))) {
return result.set(function, s);
}
} else if (nextToken == text.length()) {
// or its name should finish the expression
return result.set(function, s);
}
continue;
}
return result.set(mathType, s);
}
if (hexMode || JsclMathEngine.getInstance().getNumeralBase() == NumeralBase.hex) {
final Character ch = s.charAt(0);
if (NumeralBase.hex.getAcceptableCharacters().contains(ch)) {
return result.set(MathType.digit, s);
}
}
if (mathType == MathType.grouping_separator) {
if (i + 1 < text.length()
&& MathType.digit.getTokens().contains(text.substring(i + 1, i + 2))
&& i - 1 >= 0
&& MathType.digit.getTokens().contains(text.substring(i - 1, i))) {
return result.set(mathType, s);
}
continue;
}
return result.set(mathType, s);
}
return result.set(MathType.text, text.substring(i));
}