1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
|
#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
|| )
return (loc.left < 0) ? &localCells[loc.right] : (*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->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 e) {
return 0;
}
}
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;
}
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 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 << '"';
}
|
