parse-number
xod/stream/parse-number
Read a number with floating point from a stream of characters. Stop when a non-numeric character was encountered
parse-number
@/parse-number
Read a number with floating point from a stream of characters. Stop when a non-numeric character was encountered
CHARbyte
The next character to be processed
PUSHpulse
Push a new character to process
RSTpulse
Reset the parsed number to 0 and start over
ENDpulse
Pulses when the non-numerical character was encountered
NUMnumber
The resulting integer
C++ implementation
node {
Number n = 0;
Number fraction = 1.0;
bool isNegative = false;
bool isFraction = false;
bool isDone = false;
void evaluate(Context ctx) {
if (isInputDirty<input_RST>(ctx)) {
isDone = false;
n = 0;
}
if (!isInputDirty<input_PUSH>(ctx) || isDone)
return;
auto c = getValue<input_CHAR>(ctx);
if (c == '-' && n == 0) {
isNegative = true;
} else if (c == '.' && !isFraction) {
isFraction = true;
} else if (c >= '0' && c <= '9') {
n *= 10;
n += c - '0';
if (isFraction) {
fraction *= 0.1;
}
} else {
isDone = true;
emitValue<output_END>(ctx, 1);
}
Number sign = isNegative ? -1 : 1;
emitValue<output_NUM>(ctx, sign * n * fraction);
}
}