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

use crate::value::Primitive;
use derive_new::new;
use nu_errors::ShellError;
use nu_source::{DbgDocBldr, DebugDocBuilder, Spanned};
use serde::{Deserialize, Serialize};

/// The two types of ways to include a range end. Inclusive means to include the value (eg 1..3 inclusive would include the 3 value).
/// Exclusive excludes the value (eg 1..3 exclusive does not include 3 value)
#[derive(Debug, Copy, Clone, PartialEq, PartialOrd, Eq, Ord, Hash, Serialize, Deserialize)]
pub enum RangeInclusion {
    Inclusive,
    Exclusive,
}

impl RangeInclusion {
    /// Get a RangeInclusion left bracket ready for pretty printing
    pub fn debug_left_bracket(self) -> DebugDocBuilder {
        DbgDocBldr::delimiter(match self {
            RangeInclusion::Exclusive => "(",
            RangeInclusion::Inclusive => "[",
        })
    }

    /// Get a RangeInclusion right bracket ready for pretty printing
    pub fn debug_right_bracket(self) -> DebugDocBuilder {
        DbgDocBldr::delimiter(match self {
            RangeInclusion::Exclusive => ")",
            RangeInclusion::Inclusive => "]",
        })
    }
}

/// The range definition, holding the starting and end point of the range
#[derive(Debug, Clone, PartialEq, PartialOrd, Eq, Ord, Hash, Serialize, Deserialize, new)]
pub struct Range {
    pub from: (Spanned<Primitive>, RangeInclusion),
    pub to: (Spanned<Primitive>, RangeInclusion),
}

impl Range {
    pub fn min_u64(&self) -> Result<u64, ShellError> {
        let (from, range_incl) = &self.from;

        let minval = if let Primitive::Nothing = from.item {
            u64::MIN
        } else {
            from.item.as_u64(from.span)?
        };

        match range_incl {
            RangeInclusion::Inclusive => Ok(minval),
            RangeInclusion::Exclusive => Ok(minval.saturating_add(1)),
        }
    }

    pub fn max_u64(&self) -> Result<u64, ShellError> {
        let (to, range_incl) = &self.to;

        let maxval = if let Primitive::Nothing = to.item {
            u64::MAX
        } else {
            to.item.as_u64(to.span)?
        };

        match range_incl {
            RangeInclusion::Inclusive => Ok(maxval),
            RangeInclusion::Exclusive => Ok(maxval.saturating_sub(1)),
        }
    }

    pub fn min_i64(&self) -> Result<i64, ShellError> {
        let (from, range_incl) = &self.from;

        let minval = if let Primitive::Nothing = from.item {
            0
        } else {
            from.item.as_i64(from.span)?
        };

        match range_incl {
            RangeInclusion::Inclusive => Ok(minval),
            RangeInclusion::Exclusive => Ok(minval.saturating_add(1)),
        }
    }

    pub fn max_i64(&self) -> Result<i64, ShellError> {
        let (to, range_incl) = &self.to;

        let maxval = if let Primitive::Nothing = to.item {
            i64::MAX
        } else {
            to.item.as_i64(to.span)?
        };

        match range_incl {
            RangeInclusion::Inclusive => Ok(maxval),
            RangeInclusion::Exclusive => Ok(maxval.saturating_sub(1)),
        }
    }

    pub fn min_usize(&self) -> Result<usize, ShellError> {
        let (from, range_incl) = &self.from;

        let minval = if let Primitive::Nothing = from.item {
            usize::MIN
        } else {
            from.item.as_usize(from.span)?
        };

        match range_incl {
            RangeInclusion::Inclusive => Ok(minval),
            RangeInclusion::Exclusive => Ok(minval.saturating_add(1)),
        }
    }

    pub fn max_usize(&self) -> Result<usize, ShellError> {
        let (to, range_incl) = &self.to;

        let maxval = if let Primitive::Nothing = to.item {
            usize::MAX
        } else {
            to.item.as_usize(to.span)?
        };

        match range_incl {
            RangeInclusion::Inclusive => Ok(maxval),
            RangeInclusion::Exclusive => Ok(maxval.saturating_sub(1)),
        }
    }

    pub fn min_f64(&self) -> Result<f64, ShellError> {
        let from = &self.from.0;

        if let Primitive::Nothing = from.item {
            Ok(f64::MIN)
        } else {
            Ok(from.item.as_f64(from.span)?)
        }

        // How would inclusive vs. exclusive range work here?
    }

    pub fn max_f64(&self) -> Result<f64, ShellError> {
        let to = &self.to.0;

        if let Primitive::Nothing = to.item {
            Ok(f64::MAX)
        } else {
            Ok(to.item.as_f64(to.span)?)
        }

        // How would inclusive vs. exclusive range work here?
    }
}