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
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200

use super::Bits;
use adapter::*;

/// Extension trait for adapter operations on bit slices.
///
/// The methods return lazy adapter objects that query the underlying bit vectors
/// and perform operations as needed. To eagerly evaluate a result, copy
/// it into a vector using the [`Bits::to_bit_vec`] method, as in the example below.
///
/// This trait is currently `pub use`d from the [`adapter`] module, but that alias
/// is deprecated.
///
/// [`Bits::to_bit_vec`]: trait.Bits.html#method.to_bit_vec
/// [`adapter`]: adapter/index.html
///
/// # Examples
///
/// ```
/// use bv::*;
///
/// let bv1: BitVec = bit_vec![false, false, true, true];
/// let bv2: BitVec = bit_vec![false, true, false, true];
///
/// let and_bv = bv1.bit_and(&bv2);
///
/// assert_eq!( and_bv[0], false );
/// assert_eq!( and_bv[1], false );
/// assert_eq!( and_bv[2], false );
/// assert_eq!( and_bv[3], true );
///
/// let bv3 = and_bv.to_bit_vec();
/// assert_eq!( bv3, bit_vec![false, false, false, true] );
/// ```
pub trait BitsExt: Bits {

    /// Concatenates two bit vectors, with the bits of `self` followed by the bits
    /// of `other`.
    fn bit_concat<Other>(&self, other: Other) -> BitConcat<&Self, Other>
        where Other: Bits<Block = Self::Block> {

        BitConcat::new(self, other)
    }

    /// Concatenates two bit vectors, with the bits of `self` followed by the bits
    /// of `other`.
    ///
    /// Consumes `self`.
    fn into_bit_concat<Other>(self, other: Other) -> BitConcat<Self, Other>
        where Self: Sized,
              Other: Bits<Block = Self::Block> {

        BitConcat::new(self, other)
    }

    /// Pads `self` with 0s on the right to reach at least `len` bits in length.
    ///
    /// If `self` is already long enough, the length is unchanged.
    fn bit_pad(&self, len: u64) -> BitConcat<&Self, BitFill<Self::Block>> {
        self.into_bit_pad(len)
    }

    /// Pads `self` with 0s on the right to reach at least `len` bits in length.
    ///
    /// If `self` is already long enough, the length is unchanged.
    ///
    /// Consumes `self`.
    fn into_bit_pad(self, len: u64) -> BitConcat<Self, BitFill<Self::Block>>
        where Self: Sized {

        let have = self.bit_len();
        let need = if len > have {len - have} else {0};
        self.into_bit_concat(BitFill::zeroes(need))
    }

    /// Returns an object that inverts the values of all the bits in `self`.
    fn bit_not(&self) -> BitNot<&Self> {
        BitNot::new(self)
    }

    /// Returns an object that inverts the values of all the bits in `self`.
    ///
    /// Consumes `self`.
    fn into_bit_not(self) -> BitNot<Self>
        where Self: Sized
    {
        BitNot::new(self)
    }

    /// Returns an object that lazily computes the bit-wise conjunction
    /// of two bit-vector-likes.
    ///
    /// If the lengths of the operands differ, the result will have
    /// the minimum of the two.
    fn bit_and<Other>(&self, other: Other) -> BitAnd<&Self, Other>
        where Other: Bits<Block = Self::Block> {

        BitAnd::new(self, other)
    }

    /// Returns an object that lazily computes the bit-wise conjunction
    /// of two bit-vector-likes.
    ///
    /// If the lengths of the operands differ, the result will have
    /// the minimum of the two.
    ///
    /// Consumes `self`.
    fn into_bit_and<Other>(self, other: Other) -> BitAnd<Self, Other>
        where Self: Sized,
              Other: Bits<Block = Self::Block> {
        BitAnd::new(self, other)
    }

    /// Returns an object that lazily computes the bit-wise disjunction
    /// of two bit-vector-likes.
    ///
    /// If the lengths of the operands differ, the result will have
    /// the minimum of the two.
    fn bit_or<Other>(&self, other: Other) -> BitOr<&Self, Other>
        where Other: Bits<Block = Self::Block> {

        BitOr::new(self, other)
    }

    /// Returns an object that lazily computes the bit-wise disjunction
    /// of two bit-vector-likes.
    ///
    /// If the lengths of the operands differ, the result will have
    /// the minimum of the two.
    ///
    /// Consumes `self`.
    fn into_bit_or<Other>(self, other: Other) -> BitOr<Self, Other>
        where Self: Sized,
              Other: Bits<Block = Self::Block> {

        BitOr::new(self, other)
    }

    /// Returns an object that lazily computes the bit-wise xor of two
    /// bit-vector-likes.
    ///
    /// If the lengths of the operands differ, the result will have
    /// the minimum of the two.
    fn bit_xor<Other>(&self, other: Other) -> BitXor<&Self, Other>
        where Other: Bits<Block = Self::Block> {

        BitXor::new(self, other)
    }

    /// Returns an object that lazily computes the bit-wise xor of two
    /// bit-vector-likes.
    ///
    /// If the lengths of the operands differ, the result will have
    /// the minimum of the two.
    ///
    /// Consumes `self`.
    fn into_bit_xor<Other>(self, other: Other) -> BitXor<Self, Other>
        where Self: Sized,
              Other: Bits<Block = Self::Block> {

        BitXor::new(self, other)
    }

    /// Returns an object that lazily zips a function over the blocks of
    /// two bit-vector-like.
    ///
    /// The third parameter to the zipping function `fun` is the number of
    /// bits in the block currently being processed. (This will be
    /// `Self::Block::nbits()` for all but the last block.)
    ///
    /// If the lengths of the operands differ, the result will have
    /// the minimum of the two.
    fn bit_zip<Other, F>(&self, other: Other, fun: F) -> BitZip<&Self, Other, F>
        where Other: Bits<Block = Self::Block>,
              F: Fn(Self::Block, Self::Block, usize) -> Self::Block {

        BitZip::new(self, other, fun)
    }

    /// Returns an object that lazily zips a function over the blocks of
    /// two bit-vector-like.
    ///
    /// The third parameter to the zipping function `fun` is the number of
    /// bits in the block currently being processed. (This will be
    /// `Self::Block::nbits()` for all but the last block.)
    ///
    /// If the lengths of the operands differ, the result will have
    /// the minimum of the two.
    ///
    /// Consumes `self`.
    fn into_bit_zip<Other, F>(self, other: Other, fun: F) -> BitZip<Self, Other, F>
        where Self: Sized,
              Other: Bits<Block = Self::Block>,
              F: Fn(Self::Block, Self::Block, usize) -> Self::Block {

        BitZip::new(self, other, fun)
    }
}

impl<T: Bits> BitsExt for T {}