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
177
178
use crate::scalar::macros::*;
use crate::scalar::Scalar;
use crate::*;
use std::cmp::Ordering::*;
use std::convert::TryFrom;
use std::ops::{Add, Div, Mul, Neg, Not, Sub};
use std::ops::{AddAssign, DivAssign, MulAssign, SubAssign};

/// `Rint` is a wrapper for `i32` in the context of an R's integer vector.
///
/// `Rint` can have a value between `i32::MIN+1` and `i32::MAX`
///
/// The value `i32::MIN` is used as `"NA"`.
///
/// `Rint` has the same footprint as an `i32` value allowing us to use it in zero copy slices.
#[repr(transparent)]
pub struct Rint(i32);

impl Scalar<i32> for Rint {
    fn inner(&self) -> i32 {
        self.0
    }

    fn new(val: i32) -> Self {
        Rint(val)
    }
}

impl Rint {
    /// ```
    /// use extendr_api::prelude::*;
    /// test! {
    ///     assert!(Rint::na().min(Rint::default()).is_na());    
    ///     assert!(Rint::default().min(Rint::na()).is_na());
    ///     assert_eq!(Rint::default().min(Rint::default()), Rint::default());
    ///     assert_eq!(Rint::from(1).min(Rint::from(2)), Rint::from(1));    
    ///     assert_eq!(Rint::from(2).min(Rint::from(1)), Rint::from(1));    
    /// }
    /// ```
    pub fn min(&self, other: Self) -> Self {
        match self.partial_cmp(&other) {
            Some(Less | Equal) => *self,
            Some(Greater) => other,
            _ => Self::na(),
        }
    }

    /// ```
    /// use extendr_api::prelude::*;
    /// test! {
    ///     assert!(Rint::na().max(Rint::default()).is_na());    
    ///     assert!(Rint::default().max(Rint::na()).is_na());
    ///     assert_eq!(Rint::default().max(Rint::default()), Rint::default());
    ///     assert_eq!(Rint::from(1).max(Rint::from(2)), Rint::from(2));    
    ///     assert_eq!(Rint::from(2).max(Rint::from(1)), Rint::from(2));    
    /// }
    /// ```
    pub fn max(&self, other: Self) -> Self {
        match self.partial_cmp(&other) {
            Some(Less) => other,
            Some(Greater | Equal) => *self,
            _ => Self::na(),
        }
    }
}

gen_trait_impl!(Rint, i32, |x: &Rint| x.0 == i32::MIN, i32::MIN);
gen_from_primitive!(Rint, i32);

impl From<Rint> for Option<i32> {
    fn from(v: Rint) -> Self {
        if v.is_na() {
            None
        } else {
            Some(v.0)
        }
    }
}

gen_sum_iter!(Rint);
gen_partial_ord!(Rint, i32);

// Generate binary ops for `+`, `-`, `*` and `/`
gen_binop!(
    Rint,
    i32,
    Add,
    |lhs: i32, rhs| lhs.checked_add(rhs),
    "Add two Rint values or an option of i32, overflows to NA."
);
gen_binop!(
    Rint,
    i32,
    Sub,
    |lhs: i32, rhs| lhs.checked_sub(rhs),
    "Subtract two Rint values or an option of i32, overflows to NA."
);
gen_binop!(
    Rint,
    i32,
    Mul,
    |lhs: i32, rhs| lhs.checked_mul(rhs),
    "Multiply two Rint values or an option of i32, overflows to NA."
);
gen_binop!(
    Rint,
    i32,
    Div,
    |lhs: i32, rhs| lhs.checked_div(rhs),
    "Divide two Rint values or an option of i32, overflows to NA."
);
gen_binopassign!(
    Rint,
    i32,
    AddAssign,
    |lhs: i32, rhs| lhs.checked_add(rhs),
    "Add two Rint values or an option of i32, modifying the left-hand side in place. Overflows to NA."
);
gen_binopassign!(
    Rint,
    i32,
    SubAssign,
    |lhs: i32, rhs| lhs.checked_sub(rhs),
    "Subtract two Rint values or an option of i32, modifying the left-hand side in place. Overflows to NA."
);
gen_binopassign!(
    Rint,
    i32,
    MulAssign,
    |lhs: i32, rhs| lhs.checked_mul(rhs),
    "Multiply two Rint values or an option of i32, modifying the left-hand side in place. Overflows to NA."
);
gen_binopassign!(
    Rint,
    i32,
    DivAssign,
    |lhs: i32, rhs| lhs.checked_div(rhs),
    "Divide two Rint values or an option of i32, modifying the left-hand side in place. Overflows to NA."
);

// Generate unary ops for -, !
gen_unop!(
    Rint,
    Neg,
    |lhs: i32| Some(-lhs),
    "Negate a Rint value, overflows to NA."
);
gen_unop!(
    Rint,
    Not,
    |lhs: i32| Some(!lhs),
    "Logical not a Rint value, overflows to NA."
);

impl TryFrom<&Robj> for Rint {
    type Error = Error;

    fn try_from(robj: &Robj) -> Result<Self> {
        let i32_val: Result<i32> = robj.try_into();
        match i32_val {
            Ok(v) => Ok(Rint::from(v)),
            // TODO: Currently this results in an extra protection of robj
            Err(Error::MustNotBeNA(_)) => Ok(Rint::na()),
            Err(e) => Err(e),
        }
    }
}

impl std::fmt::Debug for Rint {
    /// Debug format.
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        if self.is_na() {
            write!(f, "NA_INTEGER")
        } else {
            self.inner().fmt(f)
        }
    }
}