AnimExpression::Token AnimExpression::consumeNumber(const QString& str, QString::const_iterator& iter) const {
assert(iter != str.end());
assert(iter->isDigit());
auto begin = iter;
while (iter->isDigit() && iter != str.end()) {
++iter;
}
// parse whole integer part
int pos = (int)(begin - str.begin());
int len = (int)(iter - begin);
QString sub = QStringRef(const_cast<const QString*>(&str), pos, len).toString();
int whole = sub.toInt();
// parse optional fractional part
if (iter->unicode() == '.') {
iter++;
auto begin = iter;
while (iter->isDigit() && iter != str.end()) {
++iter;
}
int pos = (int)(begin - str.begin());
int len = (int)(iter - begin);
QString sub = QStringRef(const_cast<const QString*>(&str), pos, len).toString();
int fraction = sub.toInt();
return Token(computeFloat(whole, fraction));
} else {
return Token(whole);
}
}
QDate fromYYYYMMDD (const QString& yyyymmdd) {
if (yyyymmdd.length() != YYYYMMDD_FORMAT.length())
throw "Invalid input. Provide date as yyyyMMdd (e.g. June 2, 2016 = '20160602')";
for (QString::const_iterator chr (yyyymmdd.begin()); chr != yyyymmdd.end(); chr++) {
if (!chr->isDigit())
throw "Non digit character in input string.";
}
const QDate result = QDate::fromString(yyyymmdd, YYYYMMDD_FORMAT);
if (!result.isValid())
throw "Invalid date input";
return result;
}
static
ParseResult ParseDecimalPart(ParseResult const& begin, QString::const_iterator end)
{
Amount multiplier ("0.1"); //exactly 1 tenth
Amount decrement ("0.1"); //exactly 1 tenth
Amount a = ResultAmount(begin);
QString::const_iterator iter;
for (iter = ResultIter(begin); iter != end; iter++) {
if (iter->isDigit()) {
a += Amount(iter->digitValue())*multiplier;
multiplier *= decrement;
} else {
throw std::runtime_error("Invalid currency string");
}
}
return ParseResult(a,iter);
}
AnimExpression::Token AnimExpression::consumeIdentifier(const QString& str, QString::const_iterator& iter) const {
assert(iter != str.end());
assert(iter->isLetter());
auto begin = iter;
while ((iter->isLetter() || iter->isDigit()) && iter != str.end()) {
++iter;
}
int pos = (int)(begin - str.begin());
int len = (int)(iter - begin);
QStringRef stringRef(const_cast<const QString*>(&str), pos, len);
if (stringRef == "true") {
return Token(true);
} else if (stringRef == "false") {
return Token(false);
} else {
return Token(stringRef);
}
}
static
ParseResult ParseWholePart(QString::const_iterator begin, QString::const_iterator end)
{
Amount a (0);
QString::const_iterator iter;
for (iter = begin; iter != end; iter++) {
if (iter->isDigit()) {
a *= Amount(10); //scale up
a = a + Amount(iter->digitValue()); //add
} else if (*iter == QLocale().groupSeparator()) {
//eat it
} else if (*iter == QLocale().decimalPoint()) {
iter++; //skip the decimal point
return ParseResult(a, iter);
} else {
throw std::runtime_error("Invalid currency string");
}
}
return ParseResult(a,iter);
}
AnimExpression::Token AnimExpression::consumeToken(const QString& str, QString::const_iterator& iter) const {
if (!_tokenStack.empty()) {
Token top = _tokenStack.top();
_tokenStack.pop();
return top;
} else {
while (iter != str.end()) {
if (iter->isSpace()) {
++iter;
} else if (iter->isLetter()) {
return consumeIdentifier(str, iter);
} else if (iter->isDigit()) {
return consumeNumber(str, iter);
} else {
switch (iter->unicode()) {
case '&': return consumeAnd(str, iter);
case '|': return consumeOr(str, iter);
case '>': return consumeGreaterThan(str, iter);
case '<': return consumeLessThan(str, iter);
case '(': ++iter; return Token(Token::LeftParen);
case ')': ++iter; return Token(Token::RightParen);
case '!': return consumeNot(str, iter);
case '-': ++iter; return Token(Token::Minus);
case '+': ++iter; return Token(Token::Plus);
case '*': ++iter; return Token(Token::Multiply);
case '/': ++iter; return Token(Token::Divide);
case '%': ++iter; return Token(Token::Modulus);
case ',': ++iter; return Token(Token::Comma);
default:
qCCritical(animation) << "AnimExpression: unexpected char" << *iter << "at index " << (int)(iter - str.begin());
return Token(Token::Error);
}
}
}
return Token(Token::End);
}
}