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#include "CellFormula.h"
#include "CellDouble.h"
#include <cstring>
double pow(double x, unsigned y) {
double res = x;
for (unsigned i = 1; i < y; i++)
res *= res;
return res;
}
double CellFormula::calculate(unsigned index) {
double lval = formula[index].left->getNumeralValue();
if (formula[index].right < 0) {
switch (-formula[index++].right) {
case '+' : lval += formula[index].left->getNumeralValue(); break;
case '-' : lval -= formula[index].left->getNumeralValue(); break;
case '*' : lval *= formula[index].left->getNumeralValue(); break;
case '/' : lval /= formula[index].left->getNumeralValue(); break;
case '^' : lval = pow(lval, formula[index].left->getNumeralValue()); break;
}
}
switch(formula[index].right) {
case '+' : return lval + calculate(index++);
case '-' : return lval - calculate(index++);
case '*' : return lval * calculate(index++);
case '/' : return lval / calculate(index++);
case '^' :
case '\0' :
default : return lval;
}
}
CellFormula::CellFormula(const char* str, const List<List<Cell*>>* tableCells) : localCells(), formula(), rawFormula() {
this->tableCells = tableCells;
parseAndSetValue(str);
}
double CellFormula::getNumeralValue() {
return calculate();
}
String CellFormula::getValueForPrint() {
return String() += calculate();
}
void CellFormula::parseAndSetValue(const char* str) {
rawFormula = String(str);
Cell* cellToAdd;
char currOp;
while (*str != '\0') {
str++;
while (*str == ' ') str++;
if (*str == 'R') {
unsigned row = atoi(++str);
while (*str != 'C') str++;
unsigned col = atoi(++str);
while (*str != ' ') str++;
cellToAdd = (*tableCells)[row][col];
currOp = *str;
}
else {
double val = atof(str);
while ((*str >= '0' && *str <= '9') || *str == ' ') str++;
localCells.add(CellDouble(val));
cellToAdd = &localCells[localCells.get_count() - 1];
currOp = *str;
}
if (currOp == '^') currOp *= -1;
else if ((currOp == '+' || currOp == '-') && formula.get_count() != 0) {
Pair<Cell*, char>& prev = formula[formula.get_count() - 1];
if (prev.right == '*' || prev.right == '/') prev.right *= -1;
}
formula.add({cellToAdd, currOp});
}
}
void CellFormula::readFromFile(std::ifstream& file) {
file >> rawFormula;
}
void CellFormula::writeToFile(std::ofstream& file) {
file << rawFormula;
}
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