HumNum HumdrumLine::getBeat(string beatrecip) const {
HumNum beatdur = Convert::recipToDuration(beatrecip);
if (beatdur.isZero()) {
return beatdur;
}
HumNum beat = (getDurationFromBarline() / beatdur) + 1;
return beat;
}
HTp GridSlice::createRecipTokenFromDuration(HumNum duration) {
duration /= 4; // convert to quarter note units.
HTp token;
string str;
HumNum dotdur;
if (duration.getNumerator() == 0) {
// if the GridSlice is at the end of a measure, the
// time between the starttime/endtime of the GridSlice should
// be subtracted from the endtime of the current GridMeasure.
token = new HumdrumToken("g");
return token;
} else if (duration.getNumerator() == 1) {
token = new HumdrumToken(to_string(duration.getDenominator()));
return token;
} else if (duration.getNumerator() % 3 == 0) {
dotdur = ((duration * 2) / 3);
if (dotdur.getNumerator() == 1) {
token = new HumdrumToken(to_string(dotdur.getDenominator()) + ".");
return token;
}
}
// try to fit to two dots here
// try to fit to three dots here
str = to_string(duration.getDenominator()) + "%" +
to_string(duration.getNumerator());
token = new HumdrumToken(str);
return token;
}
void HumdrumLine::setDuration(HumNum aDur) {
if (aDur.isNonNegative()) {
duration = aDur;
} else {
duration = 0;
}
}
HumNum HumdrumLine::getBeat(HumNum beatdur) const {
if (beatdur.isZero()) {
return beatdur;
}
HumNum beat = (getDurationFromBarline() / beatdur) + 1;
return beat;
}
string Convert::getHumNumAttributes(const HumNum& num) {
string output;
if (num.isInteger()) {
output += " float=\"" + to_string(num.getNumerator()) + "\"";
} else {
stringstream sstr;
sstr << num.toFloat();
output += " float=\"" + sstr.str() + "\"";
}
if (!num.isInteger()) {
HumNum rem = num.getRemainder();
output += " ratfrac=\"" + to_string(rem.getNumerator()) +
+ "/" + to_string(rem.getDenominator()) + "\"";
}
return output;
}
HumNum Convert::recipToDuration(const string& recip, HumNum scale,
string separator) {
size_t loc;
loc = recip.find(separator);
string subtok;
if (loc != string::npos) {
subtok = recip.substr(0, loc);
} else {
subtok = recip;
}
loc = recip.find('q');
if (loc != string::npos) {
// grace note, ignore printed rhythm
HumNum zero(0);
return zero;
}
int dotcount = 0;
int i;
int numi = -1;
for (i=0; i<subtok.size(); i++) {
if (subtok[i] == '.') {
dotcount++;
}
if ((numi < 0) && isdigit(subtok[i])) {
numi = i;
}
}
loc = subtok.find("%");
int numerator = 1;
int denominator = 1;
HumNum output;
if (loc != string::npos) {
// reciprocal rhythm
numerator = 1;
denominator = subtok[numi++] - '0';
while ((numi < subtok.size()) && isdigit(subtok[numi])) {
denominator = denominator * 10 + (subtok[numi++] - '0');
}
if ((loc + 1 < subtok.size()) && isdigit(subtok[loc+1])) {
int xi = loc + 1;
numerator = subtok[xi++] - '0';
while ((xi < subtok.size()) && isdigit(subtok[xi])) {
numerator = numerator * 10 + (subtok[xi++] - '0');
}
}
output.setValue(numerator, denominator);
} else if (numi < 0) {
// no rhythm found
HumNum zero(0);
return zero;
} else if (subtok[numi] == '0') {
// 0-symbol
int zerocount = 1;
for (i=numi+1; i<subtok.size(); i++) {
if (subtok[i] == '0') {
zerocount++;
} else {
break;
}
}
numerator = (int)pow(2, zerocount);
output.setValue(numerator, 1);
} else {
// plain rhythm
denominator = subtok[numi++] - '0';
while ((numi < subtok.size()) && isdigit(subtok[numi])) {
denominator = denominator * 10 + (subtok[numi++] - '0');
}
output.setValue(1, denominator);
}
if (dotcount <= 0) {
return output * scale;
}
int bot = (int)pow(2.0, dotcount);
int top = (int)pow(2.0, dotcount + 1) - 1;
HumNum factor(top, bot);
return output * factor * scale;
}
