void button_clicked (GtkWidget *widget, gpointer data) {
char ch = *((char *) data);
char *str;
/* --- Get the button label --- */
str = (char *) data;
/* --- Entering a number... --- */
if (floatingPointChar (ch) && strlen (str) == 1) {
handleDigit (str, ch);
} else {
/* --- Clear? --- */
if (strcmp (str, "CE") == 0) {
gtk_label_set_text (GTK_LABEL (label), "0");
return;
/* --- BIG clear? --- */
} else if (strcmp (str, "C") == 0) {
prevCmd = (char) 0;
lastChar = (char) 0;
gtk_label_set_text (GTK_LABEL (label), "0");
return;
} else {
/* --- Maybe it's a unary operator? --- */
maybeUnaryOperation (str);
}
/* --- See if there's a binary operation to do --- */
handleBinaryOperation ();
prevCmd = ch;
}
lastChar = ch;
}
void Scanner::handleNumberState()
{
loc_ = getTokenLocation();
bool matched = false;
bool isFloat = false;
int numberBase = 10;
if (currentChar_ == '$')
{
numberBase = 16;
// eat $ and update currentChar_
getNextChar();
}
enum class NumberState
{
INTERGER,
FRACTION,
EXPONENT,
DONE
};
NumberState numberState = NumberState::INTERGER;
do
{
switch (numberState)
{
case NumberState::INTERGER:
if (numberBase == 10)
{
handleDigit();
}
else if (numberBase == 16)
{
handleXDigit();
}
// maybe want to support octal...
break;
case NumberState::FRACTION:
handleFraction();
isFloat = true;
break;
case NumberState::EXPONENT:
handleExponent();
isFloat = true;
break;
case NumberState::DONE:
break;
default:
errorToken("Match number state error.");
errorFlag_ = true;
break;
}
// change number state
if (currentChar_ == '.')
{
numberState = NumberState::FRACTION;
}
else if (currentChar_ == 'E' || currentChar_ == 'e')
{
numberState = NumberState::EXPONENT;
}
else
{
numberState = NumberState::DONE;
}
}
while (numberState != NumberState::DONE);
if (isFloat)
{
makeToken(TokenType::REAL, TokenValue::UNRESERVED, loc_,
std::stod(buffer_), buffer_);
}
else
{
makeToken(TokenType::INTEGER, TokenValue::UNRESERVED, loc_,
std::stol(buffer_, 0, numberBase), buffer_);
}
}
