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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 {
if (loc.left < 0) {
if (loc.right < 0 || localCells.get_count() - 1 < loc.right) return nullptr;
return &localCells[loc.right];
}
if (loc.right < 0
|| (*tableCells).get_count() - 1 < loc.left || (*tableCells)[loc.left].get_count() - 1 < loc.right)
return nullptr;
return (*tableCells)[loc.left][loc.right];
}
double pow(double x, int 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 == nullptr) ? 0 : currCell->getNumeralValue();
// Handle prioritised operation
while (formula[index].right < 0) {
switch (-formula[index++].right) { // Prioritized operations are stored as negative characters
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>
/*!
* Value is recalculated every time this function is called (in case a referenced cell is changed).
*
* \return 0 \if Calculation failed
* \return Calculated value \otherwise
*/
double CellFormula::getNumeralValue() const {
try {
return calculate();
}
catch (std::logic_error e) {
return 0;
}
}
/*!
* Value is recalculated every time this function is called (in case a referenced cell is changed).
*
* \return "Error" \if Calculation failed
* \return Calculated value as a String \otherwise
*/
String CellFormula::getValueForPrint() const {
try {
return String() += calculate();
}
catch (std::logic_error e) {
return "Error";
}
}
// Rough implementation of the grammar
//
// S -> WDWOS | WD.DWOS | WRDCDWOS | 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, char& buffer) {
if (*str == '+' || *str == '-' || *str == '*' || *str == '/' || *str == '^' || *str == '\0')
buffer = *(str++);
else buffer = -2;
}
/*!
* Each math operation is represented with a Pair that holds indecies of cell reference
* and a character for the operation.
*
* Negatve value for the operation character means it's with priority and the result get's calculated
* immediately (rather than recursively, taking into account other values).
*
* \exception std::logic_error("Error: Invalid column character!") Thrown when there is something between Rx and C in cell references
* \exception std::logic_error("Error: Invalid value!") Thrown when met value isn't a cell reference or number
* \exception throw std::logic_error("Error: Could not find operand!") Thrown when there isn't an operator character between two values
*/
void CellFormula::parseAndSetValue(const char* str) {
rawFormula = String(str);
formula.clear();
localCells.clear();
Pair<int, int> loc;
char currOp = -2;
str++; // Removes = from the beginning
while (*str != '\0') {
List<char> buffer;
W(str);
if (*str == 'R') {
D(++str, buffer);
loc.left = atoi(buffer.raw_data()) - 1;
if (*str != 'C') throw std::logic_error("Error: Invalid column character!");
str++;
buffer.clear();
D(str, buffer);
loc.right = atoi(buffer.raw_data()) - 1;
}
else if (*str >= '0' && *str <= '9') {
D(str, buffer);
if (*str == '.') {
buffer.add(*str);
D(++str, buffer);
localCells.add(CellDouble(atof(buffer.raw_data())));
}
else
localCells.add(CellDouble(atoi(buffer.raw_data())));
loc.left = -1;
loc.right = (int)(localCells.get_count() - 1);
}
else
throw std::logic_error("Error: Invalid value!");
W(str);
O(str, currOp);
if (currOp == -2) throw std::logic_error("Error: Could not find operand!");
// Operator priority magic
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 == '-') { // a - b turns into a + -1 * b
formula.add({loc, '+'});
localCells.add(CellDouble(-1.0));
loc.left = -1;
loc.right = (int)(localCells.get_count() - 1);
currOp = '*' * -1;
}
formula.add(Pair<Pair<int, int>, char>(loc, currOp));
}
}
void CellFormula::writeToFile(std::ofstream& file) {
file << '"' << rawFormula << '"';
}
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