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#include "CellFormula.h"
#include "CellDouble.h"
#include <cstring>
#include <iostream>
#include <stdexcept>
const Cell* CellFormula::ptrByInd(Pair<int, int> loc) const {
return (loc.left < 0) ? &localCells[loc.right] : (*tableCells)[loc.left][loc.right];
}
double pow(double x, unsigned y) {
if (y == 0) return 1;
double res = x;
for (unsigned i = 1; i < y; i++)
res *= x;
return res;
}
double CellFormula::calculate(unsigned index) const {
const Cell* currCell = ptrByInd(formula[index].left);
double numVal = currCell->getNumeralValue();
while (formula[index].right < 0) {
switch (-formula[index++].right) {
case '+' : numVal += ptrByInd(formula[index].left)->getNumeralValue(); break;
case '*' : numVal *= ptrByInd(formula[index].left)->getNumeralValue(); break;
case '/' : if (ptrByInd(formula[index].left)->getNumeralValue() == 0) throw std::logic_error("Error: Divion by zero!");
numVal /= ptrByInd(formula[index].left)->getNumeralValue(); break;
case '^' : numVal = pow(numVal, ptrByInd(formula[index].left)->getNumeralValue()); break;
}
}
double temp;
switch(formula[index].right) {
case '+' : return numVal + calculate(++index);
case '*' : return numVal * calculate(++index);
case '/' : temp = calculate(++index);
if (temp == 0) throw std::logic_error("Error: Division by zero!");
return numVal / temp;
case '^' : return pow(numVal, calculate(++index));
case '\0' :
default : return numVal;
}
}
CellFormula::CellFormula(const char* str, const List<List<Cell*>>* tableCells) : localCells(), formula(), rawFormula() {
this->tableCells = tableCells;
CellFormula::parseAndSetValue(str);
}
#include <iostream>
double CellFormula::getNumeralValue() const {
try {
return calculate();
}
catch (std::logic_error) {
return 0;
}
}
String CellFormula::getValueForPrint() const {
try {
return String() += calculate();
}
catch (std::logic_error) {
return "Error";
}
}
// Rough implementation of the grammar
//
// S -> WDS | WD.DS | WRDCDS | WOS | W
// O -> + | - | * | / | ^
// D -> D0 | D1 | ... | D9 | 0 | 1 | ... | 9
// W -> W | epsilon
//
// over the string
void W(const char*& str) {
while (*str == ' ') str++;
}
void D(const char*& str, List<char>& buffer) {
while (*str >= '0' && *str <= '9')
buffer.add(*(str++));
}
void O(const char*& str, List<char>& buffer) {
if (*str == '+' || *str == '-' || *str == '*' || *str == '/' || *str == '^')
buffer.add(*(str++));
}
void CellFormula::parseAndSetValue(const char* str) {
rawFormula = String(str);
Pair<int, int> loc;
char currOp;
while (*str != '\0') {
List<char> buffer;
W(str);
if (*str == 'R') {
D(str, buffer);
int row = atoi(buffer.raw_data());
if (*str != 'C') throw std::logic_error("Error: Invalid character!");
str++;
buffer.clear();
D(str, buffer);
int col = atoi(++str);
while (*str != ' ' && *str != '\0') str++;
while (*str == ' ') str++;
currOp = *str;
loc = {row, col};
}
else {
double val = atof(str);
while ((*str >= '0' && *str <= '9') || *str == ' ' || *str == '.') str++;
currOp = *str;
localCells.add(CellDouble(val));
loc = {-1, (int)(localCells.get_count() - 1)};
}
if (currOp == '^') currOp *= -1;
else if ((currOp == '+' || currOp == '-') && formula.get_count() != 0) {
for (unsigned i = formula.get_count() - 1; i < formula.get_count() && (formula[i].right == '*' || formula[i].right == '/'); i--)
if (formula[i].right > 0) formula[i].right *= -1;
}
if (currOp == '-') {
formula.add({loc, '+'});
localCells.add(CellDouble(-1.0));
formula.add({{-1, (int)(localCells.get_count() - 1)}, '*' * -1});
}
else formula.add({loc, currOp});
}
}
void CellFormula::writeToFile(std::ofstream& file) {
file << '"' << rawFormula << '"';
}
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