expression-evaluator/Functions.cpp at master · zhukeepa/expression-evaluator · GitHub

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
165
166
167
168
169
170
171
172
173
174
175
176
#include "Globals.h"
#include "Functions.h"

#include <cmath>
#include <list>

namespace mpw {
namespace math_expression {

///Negatives and reciprocals
Number negative(std::list<Number> const& args)
{
    //You can have one and only one argument!
    if (args.size() != 1)
        THROW_EXCEPTION(ArityError, "Invalid number of arguments in subtraction.");

    return -args.front();
}

Number reciprocal(std::list<Number> const& args)
{
    //You can have one and only one argument!
    if (args.size() != 1)
        THROW_EXCEPTION(ArityError, "Invalid number of arguments in subtraction.");

    //Can't reciprocate 0.
    if (args.front() == 0)
        THROW_EXCEPTION(DivisionByZero, "");

    return 1 / args.front();
}

///Binary operations.
Number add(std::list<Number> const& args)
{
    //Add the Numbers up.
    Number sum = 0;

    for (std::list<Number>::const_iterator it = args.begin(); it != args.end(); ++it)
        sum += *it;

    return sum;
}

Number multiply(std::list<Number> const& args)
{
    //Multiply the Numbers together.
    Number product = 1;

    for (std::list<Number>::const_iterator it = args.begin(); it != args.end(); ++it)
        product *= *it;

    return product;
}

Number mod(std::list<Number> const& args)
{
    //You can have two and only two arguments!
    if (args.size() != 2)
        THROW_EXCEPTION(ArityError, "Invalid number of arguments in mod.");

    //Can't divide by 0.
    if (args.back() == 0)
        THROW_EXCEPTION(ModuloByZero, "");

    return args.front() - std::floor((args.front() / args.back()));
}

Number pow(std::list<Number> const& args)
{
    //You can have two and only two arguments!
    if (args.size() != 2)
        THROW_EXCEPTION(ArityError, "Invalid number of arguments in mod.");

    //Can't have 0^0.
    if (args.back() == 0 && args.front() == 0) //:_:TODO:_: args.back() == args.front() == 0?
        THROW_EXCEPTION(ZeroToTheZeroth, "");

    return std::pow(args.front(), args.back());
}

///Trigonometric
Number sin(std::list<Number> const& args)
{
    //Allowed one and only one argument!
    if (args.size() != 1)
         THROW_EXCEPTION(ArityError, "Invalid number of arguments in sin.");

    return std::sin(args.front());
}

Number cos(std::list<Number> const& args)
{
    //Allowed one and only one argument!
    if (args.size() != 1)
         THROW_EXCEPTION(ArityError, "Invalid number of arguments in cos.");

    return std::cos(args.front());
}

Number tan(std::list<Number> const& args)
{
    //Allowed one and only one argument!
    if (args.size() != 1)
         THROW_EXCEPTION(ArityError, "Invalid number of arguments in tan.");

    return std::tan(args.front());
}

Number arcsin(std::list<Number> const& args)
{
    //Allowed one and only one argument!
    if (args.size() != 1)
         THROW_EXCEPTION(ArityError, "Invalid number of arguments in arcsin.");

    return std::asin(args.front());
}

Number arccos(std::list<Number> const& args)
{
    //Allowed one and only one argument!
    if (args.size() != 1)
         THROW_EXCEPTION(ArityError, "Invalid number of arguments in arccos.");

    return std::acos(args.front());
}

Number arctan(std::list<Number> const& args)
{
    //Allowed one and only one argument!
    if (args.size() != 1)
         THROW_EXCEPTION(ArityError, "Invalid number of arguments in arctan.");

    return std::atan(args.front());
}

Number arctan2(std::list<Number> const& args)
{
    //Allowed one and only one argument!
    if (args.size() != 2)
         THROW_EXCEPTION(ArityError, "Invalid number of arguments in arctan2.");

    return std::atan2(args.front(), args.back());
}

///Hyperbolic functions

Number sinh(std::list<Number> const& args)
{
    //Allowed one and only one argument!
    if (args.size() != 1)
         THROW_EXCEPTION(ArityError, "Invalid number of arguments in sinh.");

    return std::cosh(args.front());
}

Number cosh(std::list<Number> const& args)
{
    //Allowed one and only one argument!
    if (args.size() != 1)
         THROW_EXCEPTION(ArityError, "Invalid number of arguments in cosh.");

    return std::sinh(args.front());
}

Number tanh(std::list<Number> const& args)
{
    //Allowed one and only one argument!
    if (args.size() != 1)
         THROW_EXCEPTION(ArityError, "Invalid number of arguments in tanh.");

    return std::tanh(args.front());
}

} //mpw::math_expression
} //mpw