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

use super::coercion::AtomicMode;
use super::OptionNA;
use crate::error::Error;
use crate::object::Obj;
use crate::object::Vector;

pub type Double = OptionNA<f64>;
impl AtomicMode for Double {
    fn is_double() -> bool {
        true
    }
}

pub type Integer = OptionNA<i32>;
impl AtomicMode for Integer {
    fn is_integer() -> bool {
        true
    }
}

pub type Logical = OptionNA<bool>;
impl AtomicMode for Logical {
    fn is_logical() -> bool {
        true
    }
}

pub type Character = OptionNA<String>;
impl AtomicMode for Character {
    fn is_character() -> bool {
        true
    }
}

impl From<Option<i32>> for OptionNA<i32> {
    fn from(value: Option<i32>) -> Self {
        match value {
            None => Self::NA,
            Some(x) => Self::Some(x),
        }
    }
}

impl From<Option<bool>> for OptionNA<bool> {
    fn from(value: Option<bool>) -> Self {
        match value {
            None => Self::NA,
            Some(x) => Self::Some(x),
        }
    }
}

impl From<Option<String>> for OptionNA<String> {
    fn from(value: Option<String>) -> Self {
        match value {
            None => Self::NA,
            Some(x) => Self::Some(x),
        }
    }
}

impl From<Option<f64>> for OptionNA<f64> {
    fn from(value: Option<f64>) -> Self {
        match value {
            None => Self::NA,
            Some(x) => Self::Some(x),
        }
    }
}

impl<T> OptionNA<T> {
    pub fn is_na(&self) -> bool {
        matches!(self, OptionNA::NA)
    }
}

impl TryFrom<Obj> for Double {
    type Error = Error;
    fn try_from(value: Obj) -> Result<Self, Self::Error> {
        let err = Err(Error::Other(
            "Cannot convert object to scalar double.".to_string(),
        ));
        if let Obj::Vector(Vector::Double(v)) = value {
            if v.len() == 1 {
                Ok(v.iter_values().next().expect("length is one"))
            } else {
                err
            }
        } else {
            err
        }
    }
}

impl TryFrom<Obj> for Integer {
    type Error = Error;
    fn try_from(value: Obj) -> Result<Self, Self::Error> {
        let err = Err(Error::Other(
            "Cannot convert object to scalar integer.".to_string(),
        ));
        if let Obj::Vector(Vector::Integer(v)) = value {
            if v.len() == 1 {
                Ok(v.iter_values().next().expect("length is one"))
            } else {
                err
            }
        } else {
            err
        }
    }
}

impl TryFrom<Obj> for Character {
    type Error = Error;
    fn try_from(value: Obj) -> Result<Self, Self::Error> {
        let err = Err(Error::Other(
            "Cannot convert object to scalar character.".to_string(),
        ));
        if let Obj::Vector(Vector::Character(v)) = value {
            if v.len() == 1 {
                Ok(v.iter_values().next().expect("length is one"))
            } else {
                err
            }
        } else {
            err
        }
    }
}

impl TryFrom<Obj> for Logical {
    type Error = Error;
    fn try_from(value: Obj) -> Result<Self, Self::Error> {
        let err = Err(Error::Other(
            "Cannot convert object to scalar logical.".to_string(),
        ));
        if let Obj::Vector(Vector::Logical(v)) = value {
            if v.len() == 1 {
                Ok(v.iter_values().next().expect("length is one"))
            } else {
                err
            }
        } else {
            err
        }
    }
}

// TODO: Because From<T: Into<Vector>> for Obj is implement this means that
// when converting Character -> Obj we get a character vector.
// Change this once we have scalars.
impl From<Character> for Vector {
    fn from(value: Character) -> Self {
        Vector::Character(vec![value].into())
    }
}

impl From<Logical> for Vector {
    fn from(value: Logical) -> Self {
        Vector::Logical(vec![value].into())
    }
}

impl From<Double> for Vector {
    fn from(value: Double) -> Self {
        Vector::Double(vec![value].into())
    }
}

impl From<Integer> for Vector {
    fn from(value: Integer) -> Self {
        Vector::Integer(vec![value].into())
    }
}