Move bitvector to another branch till it is finished

This commit is contained in:
Eugen Wissner 2017-03-29 11:17:03 +02:00
parent aabb4fb534
commit b870179a35
2 changed files with 0 additions and 511 deletions

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@ -1,510 +0,0 @@
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/**
* Single-dimensioned bit array.
*
* Copyright: Eugene Wissner 2016-2017.
* License: $(LINK2 https://www.mozilla.org/en-US/MPL/2.0/,
* Mozilla Public License, v. 2.0).
* Authors: $(LINK2 mailto:info@caraus.de, Eugene Wissner)
*/
module tanya.container.bitvector;
/**
* Wrapper that allows bit manipulation on $(D_KEYWORD ubyte[]) array.
*/
struct BitVector
{
protected ubyte[] vector;
/**
* Params:
* array = Array should be manipulated on.
*/
this(inout(ubyte[]) array) inout pure nothrow @safe @nogc
in
{
assert(array.length <= size_t.max / 8);
assert(array !is null);
}
body
{
vector = array;
}
///
unittest
{
ubyte[5] array1 = [234, 3, 252, 10, 18];
ubyte[3] array2 = [65, 13, 173];
auto bits = BitVector(array1);
assert(bits[] is array1);
assert(bits[] !is array2);
bits = BitVector(array2);
assert(bits[] is array2);
}
/**
* Returns: Number of bits in the vector.
*/
@property inout(size_t) length() inout const pure nothrow @safe @nogc
{
return vector.length * 8;
}
/// Ditto.
inout(size_t) opDollar() inout const pure nothrow @safe @nogc
{
return vector.length * 8;
}
///
unittest
{
// [01000001, 00001101, 10101101]
ubyte[3] arr = [65, 13, 173];
auto bits = BitVector(arr);
assert(bits.length == 24);
}
/**
* Params:
* bit = Bit position.
*
* Returns: $(D_KEYWORD true) if the bit on position $(D_PARAM bit) is set,
* $(D_KEYWORD false) if not set.
*/
inout(bool) opIndex(size_t bit) inout const pure nothrow @safe @nogc
in
{
assert(bit / 8 <= vector.length);
}
body
{
return (vector[bit / 8] & (0x80 >> (bit % 8))) != 0;
}
///
unittest
{
// [01000001, 00001101, 10101101]
ubyte[3] arr = [65, 13, 173];
auto bits = BitVector(arr);
assert(!bits[0]);
assert(bits[1]);
assert(bits[7]);
assert(!bits[8]);
assert(!bits[11]);
assert(bits[12]);
assert(bits[20]);
assert(bits[23]);
}
/**
* Returns: Underlying array.
*/
inout(ubyte[]) opIndex() inout pure nothrow @safe @nogc
{
return vector;
}
///
unittest
{
// [01000001, 00001101, 10101101]
ubyte[3] arr = [65, 13, 173];
auto bits = BitVector(arr);
assert(bits[] is arr);
}
/**
* Params:
* value = $(D_KEYWORD true) if the bit should be set,
* $(D_KEYWORD false) if cleared.
* bit = Bit position.
*
* Returns: $(D_PSYMBOL this).
*/
bool opIndexAssign(bool value, size_t bit) pure nothrow @safe @nogc
in
{
assert(bit / 8 <= vector.length);
}
body
{
if (value)
{
vector[bit / 8] |= (0x80 >> (bit % 8));
}
else
{
vector[bit / 8] &= ~(0x80 >> (bit % 8));
}
return value;
}
///
unittest
{
// [01000001, 00001101, 10101101]
ubyte[3] arr = [65, 13, 173];
auto bits = BitVector(arr);
bits[5] = bits[6] = true;
assert(bits[][0] == 71);
bits[14] = true;
bits[15] = false;
assert(bits[][1] == 14);
bits[16] = bits[23] = false;
assert(bits[][2] == 44);
}
/**
* Copies bits from $(D_PARAM vector) into this $(D_PSYMBOL BitVector).
*
* The array that should be assigned, can be smaller (but not larger) than
* the underlying array of this $(D_PSYMBOL BitVector), leading zeros will
* be added in this case to the left.
*
* Params:
* vector = $(D_KEYWORD ubyte[]) array not larger than
* `$(D_PSYMBOL length) / 8`.
*
* Returns: $(D_KEYWORD this).
*/
BitVector opAssign(ubyte[] vector) pure nothrow @safe @nogc
in
{
assert(vector.length <= this.vector.length);
}
body
{
immutable delta = this.vector.length - vector.length;
if (delta > 0)
{
this.vector[0..delta] = 0;
}
this.vector[delta..$] = vector[0..$];
return this;
}
///
unittest
{
ubyte[5] array1 = [234, 3, 252, 10, 18];
ubyte[3] array2 = [65, 13, 173];
auto bits = BitVector(array1);
bits = array2;
assert(bits[][0] == 0);
assert(bits[][1] == 0);
assert(bits[][2] == 65);
assert(bits[][3] == 13);
assert(bits[][4] == 173);
bits = array2[0..2];
assert(bits[][0] == 0);
assert(bits[][1] == 0);
assert(bits[][2] == 0);
assert(bits[][3] == 65);
assert(bits[][4] == 13);
}
/**
* Support for bitwise operations.
*
* Params:
* that = Another bit vector.
*
* Returns: $(D_KEYWORD this).
*/
BitVector opOpAssign(string op)(BitVector that) pure nothrow @safe @nogc
if ((op == "^") || (op == "|") || (op == "&"))
{
return opOpAssign(op)(that.vector);
}
/// Ditto.
BitVector opOpAssign(string op)(ubyte[] that) pure nothrow @safe @nogc
if ((op == "^") || (op == "|") || (op == "&"))
in
{
assert(that.length <= vector.length);
}
body
{
for (int i = cast(int) vector.length - 1; i >= 0; --i)
{
mixin("vector[i] " ~ op ~ "= " ~ "that[i];");
}
immutable delta = vector.length - that.length;
if (delta)
{
static if (op == "&")
{
vector[0..delta] = 0;
}
}
return this;
}
///
unittest
{
// [01000001, 00001101, 10101101]
ubyte[3] array1 = [65, 13, 173];
ubyte[3] array2 = [0b01010010, 0b10111110, 0b10111110];
auto bits = BitVector(array1);
bits |= array2;
assert(bits[][0] == 0b01010011);
assert(bits[][1] == 0b10111111);
assert(bits[][2] == 0b10111111);
bits &= array2;
assert(bits[][0] == array2[0]);
assert(bits[][1] == array2[1]);
assert(bits[][2] == array2[2]);
bits ^= array2;
assert(bits[][0] == 0);
assert(bits[][1] == 0);
assert(bits[][2] == 0);
}
/**
* Support for shift operations.
*
* Params:
* n = Number of bits.
*
* Returns: $(D_KEYWORD this).
*/
BitVector opOpAssign(string op)(in size_t n) pure nothrow @safe @nogc
if ((op == "<<") || (op == ">>"))
{
if (n >= length)
{
vector[0..$] = 0;
}
else if (n != 0)
{
immutable bit = n % 8, step = n / 8;
immutable delta = 8 - bit;
size_t i, j;
static if (op == "<<")
{
for (j = step; j < vector.length - 1; ++i)
{
vector[i] = cast(ubyte)((vector[j] << bit)
| vector[++j] >> delta);
}
vector[i] = cast(ubyte)(vector[j] << bit);
vector[$ - step ..$] = 0;
}
else static if (op == ">>")
{
for (i = vector.length - 1, j = i - step; j > 0; --i)
{
vector[i] = cast(ubyte)((vector[j] >> bit)
| vector[--j] << delta);
}
vector[i] = cast(ubyte)(vector[j] >> bit);
vector[0..step] = 0;
}
}
return this;
}
///
nothrow @safe @nogc unittest
{
ubyte[4] arr = [0b10111110, 0b11110010, 0b01010010, 0b01010011];
auto bits = BitVector(arr);
bits <<= 0;
assert(bits[][0] == 0b10111110 && bits[][1] == 0b11110010
&& bits[][2] == 0b01010010 && bits[][3] == 0b01010011);
bits <<= 2;
assert(bits[][0] == 0b11111011 && bits[][1] == 0b11001001
&& bits[][2] == 0b01001001 && bits[][3] == 0b01001100);
bits <<= 4;
assert(bits[][0] == 0b10111100 && bits[][1] == 0b10010100
&& bits[][2] == 0b10010100 && bits[][3] == 0b11000000);
bits <<= 8;
assert(bits[][0] == 0b10010100 && bits[][1] == 0b10010100
&& bits[][2] == 0b11000000 && bits[][3] == 0b00000000);
bits <<= 7;
assert(bits[][0] == 0b01001010 && bits[][1] == 0b01100000
&& bits[][2] == 0b00000000 && bits[][3] == 0b00000000);
bits <<= 25;
assert(bits[][0] == 0b00000000 && bits[][1] == 0b00000000
&& bits[][2] == 0b00000000 && bits[][3] == 0b00000000);
arr = [0b00110011, 0b11001100, 0b11111111, 0b01010101];
bits <<= 24;
assert(bits[][0] == 0b01010101 && bits[][1] == 0b00000000
&& bits[][2] == 0b00000000 && bits[][3] == 0b00000000);
arr[1] = 0b11001100;
arr[2] = 0b11111111;
arr[3] = 0b01010101;
bits <<= 12;
assert(bits[][0] == 0b11001111 && bits[][1] == 0b11110101
&& bits[][2] == 0b01010000 && bits[][3] == 0b00000000);
bits <<= 100;
assert(bits[][0] == 0b00000000 && bits[][1] == 0b00000000
&& bits[][2] == 0b00000000 && bits[][3] == 0b00000000);
arr = [0b10111110, 0b11110010, 0b01010010, 0b01010011];
bits >>= 0;
assert(bits[][0] == 0b10111110 && bits[][1] == 0b11110010
&& bits[][2] == 0b01010010 && bits[][3] == 0b01010011);
bits >>= 2;
assert(bits[][0] == 0b00101111 && bits[][1] == 0b10111100
&& bits[][2] == 0b10010100 && bits[][3] == 0b10010100);
bits >>= 4;
assert(bits[][0] == 0b00000010 && bits[][1] == 0b11111011
&& bits[][2] == 0b11001001 && bits[][3] == 0b01001001);
bits >>= 8;
assert(bits[][0] == 0b00000000 && bits[][1] == 0b00000010
&& bits[][2] == 0b11111011 && bits[][3] == 0b11001001);
bits >>= 7;
assert(bits[][0] == 0b00000000 && bits[][1] == 0b00000000
&& bits[][2] == 0b00000101 && bits[][3] == 0b11110111);
bits >>= 25;
assert(bits[][0] == 0b00000000 && bits[][1] == 0b00000000
&& bits[][2] == 0b00000000 && bits[][3] == 0b00000000);
arr = [0b00110011, 0b11001100, 0b11111111, 0b01010101];
bits >>= 24;
assert(bits[][0] == 0b00000000 && bits[][1] == 0b00000000
&& bits[][2] == 0b00000000 && bits[][3] == 0b00110011);
arr[1] = 0b11001100;
arr[2] = 0b11111111;
arr[3] = 0b01010101;
bits >>= 12;
assert(bits[][0] == 0b00000000 && bits[][1] == 0b00000000
&& bits[][2] == 0b00001100 && bits[][3] == 0b11001111);
bits >>= 100;
assert(bits[][0] == 0b00000000 && bits[][1] == 0b00000000
&& bits[][2] == 0b00000000 && bits[][3] == 0b00000000);
}
/**
* Negates all bits.
*
* Returns: $(D_KEYWORD this).
*/
BitVector opUnary(string op)() pure nothrow @safe @nogc
if (op == "~")
{
foreach (ref b; vector)
{
b = ~b;
}
return this;
}
///
unittest
{
// [01000001, 00001101, 10101101]
ubyte[3] arr = [65, 13, 173];
auto bits = BitVector(arr);
~bits;
assert(bits[][0] == 0b10111110);
assert(bits[][1] == 0b11110010);
assert(bits[][2] == 0b01010010);
}
/**
* Iterates through all bits.
*
* Params:
* dg = $(D_KEYWORD foreach) delegate.
*
* Returns: By $(D_PARAM dg) returned value.
*/
int opApply(int delegate(size_t, bool) dg)
{
int result;
foreach (i, ref v; vector)
{
foreach (c; 0..8)
{
result = dg(i * 8 + c, (v & (0x80 >> c)) != 0);
if (result)
{
return result;
}
}
}
return result;
}
/// Ditto.
int opApply(int delegate(bool) dg)
{
int result;
foreach (ref v; vector)
{
foreach (c; 0..8)
{
result = dg((v & (0x80 >> c)) != 0);
if (result)
{
return result;
}
}
}
return result;
}
///
unittest
{
ubyte[2] arr = [0b01000001, 0b00001101];
auto bits = BitVector(arr);
size_t c;
foreach (i, v; bits)
{
assert(i == c);
if (i == 1 || i == 7 || i == 15 || i == 13 || i == 12)
{
assert(v);
}
else
{
assert(!v);
}
++c;
}
assert(c == 16);
}
}

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@ -12,7 +12,6 @@
*/
module tanya.container;
public import tanya.container.bitvector;
public import tanya.container.buffer;
public import tanya.container.list;
public import tanya.container.vector;