Probably not the most efficient, and for some reason it doesn’t update output when string is empty until new input is started (if you hit clear or BCKS the last character, output does not update [i.e. clear] until you add the 1st char of new string), but it is a start at what you want… It currently takes a byte as input to force a single character. It should probably raise error when SIZE is exceeded, but currently it just ignores input when string has reached max length. Due to XOD not updating without change to input, it is impossible to input double characters (i.e. second X is still an X, so no update is made until IN changes to a new character). The only solution I can think of to resolve that is to add an UPD pin.
#pragma XOD dirtieness disable
#define SIZE 16
struct State {
char str[SIZE];
int size = 0;
CStringView view;
State() : view(str) { }
};
{{ GENERATED_CODE }}
void evaluate(Context ctx) {
auto state = getState(ctx);
if (isSettingUp() || isInputDirty<input_CLR>(ctx)) {
for (int i=0; i<SIZE; ++i) {
state->str[i] = 0;
}
state->size = 0;
} else if (isInputDirty<input_BCKS>(ctx)) {
if (state->size > 0) {
state->str[--state->size] = 0;
}
} else if (isInputDirty<input_SPC>(ctx)) {
if (state->size < SIZE) {
state->str[state->size++] = ' ';
}
} else {
if (state->size < SIZE) {
state->str[state->size++] = getValue<input_IN>(ctx);
}
}
emitValue<output_OUT>(ctx, XString(&state->view));
}
You can replace the input_IN line above with the following if you want to use string input instead of byte & ignore all but the 1st character in the string (and NULL string – which provides a way to enter repeat characters if you switch to empty string between the repeats):
char in = *(getValue<input_IN>(ctx).iterate());
if (in) { state->str[state->size++] = in; }
I’ve been reading through XOD code trying to figure out strings. Still haven’t found code for view(), but I’m guessing it checks if string isValid() before updating, and the empty string starts with end-of-string (i.e. NULL), which is interpreted as !isValid(), so output doesn’t get updated. If I add code to CLR & BCKS to make str[0] = <space_char>, the watch function clears correctly, but downstream code will see space instead of empty string, which is likely to cause issues…
