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uuid.d
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/**
* A $(LINK2 http://en.wikipedia.org/wiki/Universally_unique_identifier, UUID), or
* $(LINK2 http://en.wikipedia.org/wiki/Universally_unique_identifier, Universally unique identifier),
* is intended to uniquely identify information in a distributed environment
* without significant central coordination. It can be
* used to tag objects with very short lifetimes, or to reliably identify very
* persistent objects across a network.
*
$(SCRIPT inhibitQuickIndex = 1;)
$(DIVC quickindex,
$(BOOKTABLE ,
$(TR $(TH Category) $(TH Functions)
)
$(TR $(TDNW Parsing UUIDs)
$(TD $(MYREF parseUUID)
$(MYREF UUID)
$(MYREF UUIDParsingException)
$(MYREF uuidRegex)
)
)
$(TR $(TDNW Generating UUIDs)
$(TD $(MYREF sha1UUID)
$(MYREF randomUUID)
$(MYREF md5UUID)
)
)
$(TR $(TDNW Using UUIDs)
$(TD $(MYREF2 UUID.uuidVersion, uuidVersion)
$(MYREF2 UUID.variant, variant)
$(MYREF2 UUID.toString, toString)
$(MYREF2 UUID.data, data)
$(MYREF2 UUID.swap, swap)
$(MYREF2 UUID.opEquals, opEquals)
$(MYREF2 UUID.opCmp, opCmp)
$(MYREF2 UUID.toHash, toHash)
)
)
$(TR $(TDNW UUID namespaces)
$(TD $(MYREF dnsNamespace)
$(MYREF urlNamespace)
$(MYREF oidNamespace)
$(MYREF x500Namespace)
)
)
)
)
* UUIDs have many applications. Some examples follow: Databases may use UUIDs to identify
* rows or records in order to ensure that they are unique across different
* databases, or for publication/subscription services. Network messages may be
* identified with a UUID to ensure that different parts of a message are put back together
* again. Distributed computing may use UUIDs to identify a remote procedure call.
* Transactions and classes involved in serialization may be identified by UUIDs.
* Microsoft's component object model (COM) uses UUIDs to distinguish different software
* component interfaces. UUIDs are inserted into documents from Microsoft Office programs.
* UUIDs identify audio or video streams in the Advanced Systems Format (ASF). UUIDs are
* also a basis for OIDs (object identifiers), and URNs (uniform resource name).
*
* An attractive feature of UUIDs when compared to alternatives is their relative small size,
* of 128 bits, or 16 bytes. Another is that the creation of UUIDs does not require
* a centralized authority.
*
* When UUIDs are generated by one of the defined mechanisms, they are either guaranteed
* to be unique, different from all other generated UUIDs (that is, it has never been
* generated before and it will never be generated again), or it is extremely likely
* to be unique (depending on the mechanism).
*
* For efficiency, UUID is implemented as a struct. UUIDs are therefore empty if not explicitly
* initialized. An UUID is empty if $(MYREF3 UUID.empty, empty) is true. Empty UUIDs are equal to
* $(D UUID.init), which is a UUID with all 16 bytes set to 0.
* Use UUID's constructors or the UUID generator functions to get an initialized UUID.
*
* This is a port of $(LINK2 http://www.boost.org/doc/libs/1_42_0/libs/uuid/uuid.html,
* boost._uuid) from the Boost project with some minor additions and API
* changes for a more D-like API.
*
* Standards:
* $(LINK2 http://www.ietf.org/rfc/rfc4122.txt, RFC 4122)
*
* See_Also:
* $(LINK http://en.wikipedia.org/wiki/Universally_unique_identifier)
*
* Copyright: Copyright Johannes Pfau 2011 - .
* License: $(HTTP www.boost.org/LICENSE_1_0.txt, Boost License 1.0).
* Authors: Johannes Pfau
* Source: $(PHOBOSSRC std/_uuid.d)
*
* Macros:
* MYREF2 = <a href="#$2">$(TT $1)</a>
* MYREF3 = <a href="#$2">$(D $1)</a>
*/
/* Copyright Johannes Pfau 2011 - 2012.
* Distributed under the Boost Software License, Version 1.0.
* (See accompanying file LICENSE_1_0.txt or copy at
* http://www.boost.org/LICENSE_1_0.txt)
*/
module std.uuid;
///
@safe unittest
{
import std.uuid;
UUID[] ids;
ids ~= randomUUID();
ids ~= md5UUID("test.name.123");
ids ~= sha1UUID("test.name.123");
foreach (entry; ids)
{
assert(entry.variant == UUID.Variant.rfc4122);
}
assert(ids[0].uuidVersion == UUID.Version.randomNumberBased);
assert(ids[1].toString() == "22390768-cced-325f-8f0f-cfeaa19d0ccd");
assert(ids[1].data == [34, 57, 7, 104, 204, 237, 50, 95, 143, 15, 207,
234, 161, 157, 12, 205]);
UUID id;
assert(id.empty);
}
import std.range.primitives;
import std.traits;
/**
*
*/
public struct UUID
{
import std.meta : AliasSeq, allSatisfy;
private:
alias skipSeq = AliasSeq!(8, 13, 18, 23);
alias byteSeq = AliasSeq!(0,2,4,6,9,11,14,16,19,21,24,26,28,30,32,34);
@safe pure nothrow @nogc Char toChar(Char)(size_t i) const
{
if (i <= 9)
return cast(Char)('0' + i);
else
return cast(Char)('a' + (i-10));
}
@safe pure nothrow unittest
{
assert(UUID(cast(ubyte[16])[138, 179, 6, 14, 44, 186, 79, 35, 183, 76, 181, 45,
179, 189, 251, 70]).toString() == "8ab3060e-2cba-4f23-b74c-b52db3bdfb46");
}
// Reinterpret the UUID as an array of some other primitive.
@trusted ref T[16 / T.sizeof] asArrayOf(T)() return
if (isIntegral!T)
{
return *cast(typeof(return)*)&data;
}
public:
/**
* RFC 4122 defines different internal data layouts for UUIDs. These are
* the UUID formats supported by this module. It's
* possible to read, compare and use all these Variants, but
* UUIDs generated by this module will always be in rfc4122 format.
*
* Note: Do not confuse this with $(REF _Variant, std,_variant).
*/
enum Variant
{
ncs, /// NCS backward compatibility
rfc4122, /// Defined in RFC 4122 document
microsoft, /// Microsoft Corporation backward compatibility
future ///Reserved for future use
}
/**
* RFC 4122 defines different UUID versions. The version shows
* how a UUID was generated, e.g. a version 4 UUID was generated
* from a random number, a version 3 UUID from an MD5 hash of a name.
*
* Note:
* All of these UUID versions can be read and processed by
* $(D std.uuid), but only version 3, 4 and 5 UUIDs can be generated.
*/
enum Version
{
///Unknown version
unknown = -1,
///Version 1
timeBased = 1,
///Version 2
dceSecurity = 2,
///Version 3 (Name based + MD5)
nameBasedMD5 = 3,
///Version 4 (Random)
randomNumberBased = 4,
///Version 5 (Name based + SHA-1)
nameBasedSHA1 = 5
}
union
{
/**
* It is sometimes useful to get or set the 16 bytes of a UUID
* directly.
*
* Note:
* UUID uses a 16-ubyte representation for the UUID data.
* RFC 4122 defines a UUID as a special structure in big-endian
* format. These 16-ubytes always equal the big-endian structure
* defined in RFC 4122.
*
* Example:
* -----------------------------------------------
* auto rawData = uuid.data; //get data
* rawData[0] = 1; //modify
* uuid.data = rawData; //set data
* uuid.data[1] = 2; //modify directly
* -----------------------------------------------
*/
ubyte[16] data;
private ulong[2] ulongs;
static if (size_t.sizeof == 4)
private uint[4] uints;
}
/*
* We could use a union here to also provide access to the
* fields specified in RFC 4122, but as we never have to access
* those (only necessary for version 1 (and maybe 2) UUIDs),
* that is not needed right now.
*/
@safe pure unittest
{
UUID tmp;
tmp.data = cast(ubyte[16])[0,1,2,3,4,5,6,7,8,9,10,11,12,
13,14,15];
assert(tmp.data == cast(ubyte[16])[0,1,2,3,4,5,6,7,8,9,10,11,
12,13,14,15]);
tmp.data[2] = 3;
assert(tmp.data == cast(ubyte[16])[0,1,3,3,4,5,6,7,8,9,10,11,
12,13,14,15]);
auto tmp2 = cast(immutable UUID) tmp;
assert(tmp2.data == cast(ubyte[16])[0,1,3,3,4,5,6,7,8,9,10,11,
12,13,14,15]);
}
/**
* Construct a UUID struct from the 16 byte representation
* of a UUID.
*/
@safe pure nothrow @nogc this(ref in ubyte[16] uuidData)
{
data = uuidData;
}
/// ditto
@safe pure nothrow @nogc this(in ubyte[16] uuidData)
{
data = uuidData;
}
///
@safe pure unittest
{
enum ubyte[16] data = [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15];
auto uuid = UUID(data);
enum ctfe = UUID(data);
assert(uuid.data == data);
assert(ctfe.data == data);
}
/**
* Construct a UUID struct from the 16 byte representation
* of a UUID. Variadic constructor to allow a simpler syntax, see examples.
* You need to pass exactly 16 ubytes.
*/
@safe pure this(T...)(T uuidData)
if (uuidData.length == 16 && allSatisfy!(isIntegral, T))
{
import std.conv : to;
foreach (idx, it; uuidData)
{
this.data[idx] = to!ubyte(it);
}
}
///
@safe unittest
{
auto tmp = UUID(0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15);
assert(tmp.data == cast(ubyte[16])[0,1,2,3,4,5,6,7,8,9,10,11,
12,13,14,15]);
}
@safe unittest
{
UUID tmp = UUID(0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15);
assert(tmp.data == cast(ubyte[16])[0,1,2,3,4,5,6,7,8,9,10,11,
12,13,14,15]);
enum UUID ctfeID = UUID(0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15);
assert(ctfeID == tmp);
//Too few arguments
assert(!__traits(compiles, typeof(UUID(0,1,2,3,4,5,6,7,8,9,10,11,12,13,14))));
//Too many arguments
assert(!__traits(compiles, typeof(UUID(0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,1))));
}
/**
* <a name="UUID(string)"></a>
* Parse a UUID from its canonical string form. An UUID in its
* canonical form looks like this: 8ab3060e-2cba-4f23-b74c-b52db3bdfb46
*
* Throws:
* $(LREF UUIDParsingException) if the input is invalid
*
* CTFE:
* This function is supported in CTFE code. Note that error messages
* caused by a malformed UUID parsed at compile time can be cryptic,
* but errors are detected and reported at
* compile time.
*
* Note:
* This is a strict parser. It only accepts the pattern above.
* It doesn't support any leading or trailing characters. It only
* accepts characters used for hex numbers and the string must have
* hyphens exactly like above.
*
* For a less strict parser, see $(LREF parseUUID)
*/
this(T)(in T[] uuid) if (isSomeChar!(Unqual!T))
{
import std.conv : to, parse;
if (uuid.length < 36)
{
throw new UUIDParsingException(to!string(uuid), 0,
UUIDParsingException.Reason.tooLittle, "Insufficient Input");
}
if (uuid.length > 36)
{
throw new UUIDParsingException(to!string(uuid), 35, UUIDParsingException.Reason.tooMuch,
"Input is too long, need exactly 36 characters");
}
static immutable skipInd = [skipSeq];
foreach (pos; skipInd)
if (uuid[pos] != '-')
throw new UUIDParsingException(to!string(uuid), pos,
UUIDParsingException.Reason.invalidChar, "Expected '-'");
ubyte[16] data2; //ctfe bug
uint pos = void;
foreach (i, p; byteSeq)
{
enum uint s = 'a'-10-'0';
uint h = uuid[p];
uint l = uuid[p+1];
pos = p;
if (h < '0') goto Lerr;
if (l < '0') goto Lerr;
if (h > '9')
{
h |= 0x20; //poorman's tolower
if (h < 'a') goto Lerr;
if (h > 'f') goto Lerr;
h -= s;
}
if (l > '9')
{
l |= 0x20; //poorman's tolower
if (l < 'a') goto Lerr;
if (l > 'f') goto Lerr;
l -= s;
}
h -= '0';
l -= '0';
data2[i] = cast(ubyte)((h << 4) ^ l);
}
this.data = data2;
return;
Lerr: throw new UUIDParsingException(to!string(uuid), pos,
UUIDParsingException.Reason.invalidChar, "Couldn't parse ubyte");
}
///
@safe pure unittest
{
auto id = UUID("8AB3060E-2cba-4f23-b74c-b52db3bdfb46");
assert(id.data == [138, 179, 6, 14, 44, 186, 79, 35, 183, 76,
181, 45, 179, 189, 251, 70]);
assert(id.toString() == "8ab3060e-2cba-4f23-b74c-b52db3bdfb46");
//Can also be used in CTFE, for example as UUID literals:
enum ctfeID = UUID("8ab3060e-2cba-4f23-b74c-b52db3bdfb46");
//here parsing is done at compile time, no runtime overhead!
}
@safe pure unittest
{
import std.conv : to;
import std.exception;
import std.meta : AliasSeq;
static foreach (S; AliasSeq!(char[], const(char)[], immutable(char)[],
wchar[], const(wchar)[], immutable(wchar)[],
dchar[], const(dchar)[], immutable(dchar)[],
immutable(char[]), immutable(wchar[]), immutable(dchar[])))
{{
//Test valid, working cases
assert(UUID(to!S("00000000-0000-0000-0000-000000000000")).empty);
auto id = UUID(to!S("8AB3060E-2cba-4f23-b74c-b52db3bdfb46"));
assert(id.data == [138, 179, 6, 14, 44, 186, 79, 35, 183, 76,
181, 45, 179, 189, 251, 70]);
assert(id.toString() == "8ab3060e-2cba-4f23-b74c-b52db3bdfb46");
enum UUID ctfe = UUID(to!S("8ab3060e-2cba-4f23-b74c-b52db3bdfb46"));
assert(ctfe == id);
assert(UUID(to!S("5668122d-9df0-49a4-ad0b-b9b0a57f886a")).data
== [86, 104, 18, 45, 157, 240, 73, 164, 173, 11, 185, 176, 165, 127, 136, 106]);
//Test too short UUIDS
auto except = collectException!UUIDParsingException(
UUID(to!S("5668122d-9df0-49a4-ad0b-b9b0a57f886")));
assert(except && except.reason == UUIDParsingException.Reason.tooLittle);
//Test too long UUIDS
except = collectException!UUIDParsingException(
UUID(to!S("5668122d-9df0-49a4-ad0b-b9b0a57f886aa")));
assert(except && except.reason == UUIDParsingException.Reason.tooMuch);
//Test dashes
except = collectException!UUIDParsingException(
UUID(to!S("8ab3060e2cba-4f23-b74c-b52db3bdfb-46")));
assert(except && except.reason == UUIDParsingException.Reason.invalidChar);
//Test dashes 2
except = collectException!UUIDParsingException(
UUID(to!S("8ab3-060e2cba-4f23-b74c-b52db3bdfb46")));
assert(except && except.reason == UUIDParsingException.Reason.invalidChar);
//Test invalid characters
//make sure 36 characters in total or we'll get a 'tooMuch' reason
except = collectException!UUIDParsingException(
UUID(to!S("{8ab3060e-2cba-4f23-b74c-b52db3bdf6}")));
assert(except && except.reason == UUIDParsingException.Reason.invalidChar);
//Boost test
assert(UUID(to!S("01234567-89ab-cdef-0123-456789ABCDEF"))
== UUID(cast(ubyte[16])[0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef,0x01,
0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef]));
}
}}
/**
* Returns true if and only if the UUID is equal
* to {00000000-0000-0000-0000-000000000000}
*/
@trusted pure nothrow @nogc @property bool empty() const
{
if (__ctfe)
return data == (ubyte[16]).init;
auto p = cast(const(size_t*))data.ptr;
static if (size_t.sizeof == 4)
return p[0] == 0 && p[1] == 0 && p[2] == 0 && p[3] == 0;
else static if (size_t.sizeof == 8)
return p[0] == 0 && p[1] == 0;
else
static assert(false, "nonsense, it's not 32 or 64 bit");
}
///
@safe pure unittest
{
UUID id;
assert(id.empty);
id = UUID("00000000-0000-0000-0000-000000000001");
assert(!id.empty);
}
@safe pure unittest
{
ubyte[16] getData(size_t i)
{
ubyte[16] data;
data[i] = 1;
return data;
}
for (size_t i = 0; i < 16; i++)
{
assert(!UUID(getData(i)).empty);
}
enum ctfeEmpty = UUID.init.empty;
assert(ctfeEmpty);
bool ctfeTest()
{
for (size_t i = 0; i < 16; i++)
{
auto ctfeEmpty2 = UUID(getData(i)).empty;
assert(!ctfeEmpty2);
}
return true;
}
enum res = ctfeTest();
}
/**
* RFC 4122 defines different internal data layouts for UUIDs.
* Returns the format used by this UUID.
*
* Note: Do not confuse this with $(REF _Variant, std,_variant).
* The type of this property is $(MYREF3 std.uuid.UUID.Variant, _Variant).
*
* See_Also:
* $(MYREF3 UUID.Variant, Variant)
*/
@safe pure nothrow @nogc @property Variant variant() const
{
//variant is stored in octet 7
//which is index 8, since indexes count backwards
immutable octet7 = data[8]; //octet 7 is array index 8
if ((octet7 & 0x80) == 0x00) //0b0xxxxxxx
return Variant.ncs;
else if ((octet7 & 0xC0) == 0x80) //0b10xxxxxx
return Variant.rfc4122;
else if ((octet7 & 0xE0) == 0xC0) //0b110xxxxx
return Variant.microsoft;
else
{
//assert((octet7 & 0xE0) == 0xE0, "Unknown UUID variant!") //0b111xxxx
return Variant.future;
}
}
///
@safe pure unittest
{
assert(UUID("8ab3060e-2cba-4f23-b74c-b52db3bdfb46").variant
== UUID.Variant.rfc4122);
}
@system pure unittest
{
// @system due to Variant
Variant[ubyte] tests = cast(Variant[ubyte])[0x00 : Variant.ncs,
0x10 : Variant.ncs,
0x20 : Variant.ncs,
0x30 : Variant.ncs,
0x40 : Variant.ncs,
0x50 : Variant.ncs,
0x60 : Variant.ncs,
0x70 : Variant.ncs,
0x80 : Variant.rfc4122,
0x90 : Variant.rfc4122,
0xa0 : Variant.rfc4122,
0xb0 : Variant.rfc4122,
0xc0 : Variant.microsoft,
0xd0 : Variant.microsoft,
0xe0 : Variant.future,
0xf0 : Variant.future];
foreach (key, value; tests)
{
UUID u;
u.data[8] = key;
assert(u.variant == value);
}
}
/**
* RFC 4122 defines different UUID versions. The version shows
* how a UUID was generated, e.g. a version 4 UUID was generated
* from a random number, a version 3 UUID from an MD5 hash of a name.
* Returns the version used by this UUID.
*
* See_Also:
* $(MYREF3 UUID.Version, Version)
*/
@safe pure nothrow @nogc @property Version uuidVersion() const
{
//version is stored in octet 9
//which is index 6, since indexes count backwards
immutable octet9 = data[6];
if ((octet9 & 0xF0) == 0x10)
return Version.timeBased;
else if ((octet9 & 0xF0) == 0x20)
return Version.dceSecurity;
else if ((octet9 & 0xF0) == 0x30)
return Version.nameBasedMD5;
else if ((octet9 & 0xF0) == 0x40)
return Version.randomNumberBased;
else if ((octet9 & 0xF0) == 0x50)
return Version.nameBasedSHA1;
else
return Version.unknown;
}
///
@safe unittest
{
assert(UUID("8ab3060e-2cba-4f23-b74c-b52db3bdfb46").uuidVersion
== UUID.Version.randomNumberBased);
}
@system unittest
{
// @system due to cast
Version[ubyte] tests = cast(Version[ubyte]) [
0x00 : UUID.Version.unknown,
0x10 : UUID.Version.timeBased,
0x20 : UUID.Version.dceSecurity,
0x30 : UUID.Version.nameBasedMD5,
0x40 : UUID.Version.randomNumberBased,
0x50 : UUID.Version.nameBasedSHA1,
0x60 : UUID.Version.unknown,
0x70 : UUID.Version.unknown,
0x80 : UUID.Version.unknown,
0x90 : UUID.Version.unknown,
0xa0 : UUID.Version.unknown,
0xb0 : UUID.Version.unknown,
0xc0 : UUID.Version.unknown,
0xd0 : UUID.Version.unknown,
0xe0 : UUID.Version.unknown,
0xf0 : UUID.Version.unknown];
foreach (key, value; tests)
{
UUID u;
u.data[6] = key;
assert(u.uuidVersion == value);
}
}
/**
* Swap the data of this UUID with the data of rhs.
*/
@safe pure nothrow @nogc void swap(ref UUID rhs)
{
immutable bck = data;
data = rhs.data;
rhs.data = bck;
}
///
@safe unittest
{
immutable ubyte[16] data = [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15];
UUID u1;
UUID u2 = UUID(data);
u1.swap(u2);
assert(u1 == UUID(data));
assert(u2 == UUID.init);
}
/**
* All of the standard numeric operators are defined for
* the UUID struct.
*/
@safe pure nothrow @nogc bool opEquals(in UUID s) const
{
return ulongs[0] == s.ulongs[0] && ulongs[1] == s.ulongs[1];
}
///
@safe pure unittest
{
//compare UUIDs
assert(UUID("00000000-0000-0000-0000-000000000000") == UUID.init);
//UUIDs in associative arrays:
int[UUID] test = [UUID("8a94f585-d180-44f7-8929-6fca0189c7d0") : 1,
UUID("7c351fd4-b860-4ee3-bbdc-7f79f3dfb00a") : 2,
UUID("9ac0a4e5-10ee-493a-86fc-d29eeb82ecc1") : 3];
assert(test[UUID("9ac0a4e5-10ee-493a-86fc-d29eeb82ecc1")] == 3);
//UUIDS can be sorted:
import std.algorithm;
UUID[] ids = [UUID("8a94f585-d180-44f7-8929-6fca0189c7d0"),
UUID("7c351fd4-b860-4ee3-bbdc-7f79f3dfb00a"),
UUID("9ac0a4e5-10ee-493a-86fc-d29eeb82ecc1")];
sort(ids);
}
/**
* ditto
*/
@safe pure nothrow @nogc bool opEquals(ref in UUID s) const
{
return ulongs[0] == s.ulongs[0] && ulongs[1] == s.ulongs[1];
}
/**
* ditto
*/
@safe pure nothrow @nogc int opCmp(in UUID s) const
{
import std.algorithm.comparison : cmp;
return cmp(this.data[], s.data[]);
}
/**
* ditto
*/
@safe pure nothrow @nogc int opCmp(ref in UUID s) const
{
import std.algorithm.comparison : cmp;
return cmp(this.data[], s.data[]);
}
/**
* ditto
*/
@safe pure nothrow @nogc UUID opAssign(in UUID s)
{
ulongs[0] = s.ulongs[0];
ulongs[1] = s.ulongs[1];
return this;
}
/**
* ditto
*/
@safe pure nothrow @nogc UUID opAssign(ref in UUID s)
{
ulongs[0] = s.ulongs[0];
ulongs[1] = s.ulongs[1];
return this;
}
/**
* ditto
*/
//MurmurHash2
@safe pure nothrow @nogc size_t toHash() const
{
static if (size_t.sizeof == 4)
{
enum uint m = 0x5bd1e995;
enum uint n = 16;
enum uint r = 24;
uint h = n;
uint k = uints[0];
k *= m;
k ^= k >> r;
k *= m;
h ^= k;
h *= m;
k = uints[1];
k *= m;
k ^= k >> r;
k *= m;
h ^= k;
h *= m;
k = uints[2];
k *= m;
k ^= k >> r;
k *= m;
h ^= k;
h *= m;
k = uints[3];
k *= m;
k ^= k >> r;
k *= m;
h ^= k;
h *= m;
}
else
{
enum ulong m = 0xc6a4a7935bd1e995UL;
enum ulong n = m * 16;
enum uint r = 47;
ulong h = n;
ulong k = ulongs[0];
k *= m;
k ^= k >> r;
k *= m;
h ^= k;
h *= m;
k = ulongs[1];
k *= m;
k ^= k >> r;
k *= m;
h ^= k;
h *= m;
}
return h;
}
@safe unittest
{
assert(UUID("00000000-0000-0000-0000-000000000000") == UUID.init);
int[UUID] test = [UUID("8a94f585-d180-44f7-8929-6fca0189c7d0") : 1,
UUID("7c351fd4-b860-4ee3-bbdc-7f79f3dfb00a") : 2,
UUID("9ac0a4e5-10ee-493a-86fc-d29eeb82ecc1") : 3];
assert(test[UUID("9ac0a4e5-10ee-493a-86fc-d29eeb82ecc1")] == 3);
import std.algorithm;
UUID[] ids = [UUID("8a94f585-d180-44f7-8929-6fca0189c7d0"),
UUID("7c351fd4-b860-4ee3-bbdc-7f79f3dfb00a"),
UUID("9ac0a4e5-10ee-493a-86fc-d29eeb82ecc1")];
sort(ids);
auto id2 = ids.dup;
ids = [UUID("7c351fd4-b860-4ee3-bbdc-7f79f3dfb00a"),
UUID("8a94f585-d180-44f7-8929-6fca0189c7d0"),
UUID("9ac0a4e5-10ee-493a-86fc-d29eeb82ecc1")];
sort(ids);
assert(ids == id2);
//test comparsion
UUID u1;
UUID u2 = UUID(cast(ubyte[16])[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]);
UUID u3 = UUID(cast(ubyte[16])[255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255]);
assert(u1 == u1);
assert(u1 != u2);
assert(u1 < u2);
assert(u2 < u3);
assert(u1 <= u1);
assert(u1 <= u2);
assert(u2 <= u3);
assert(u2 >= u2);
assert(u3 >= u2);
assert(u3 >= u3);
assert(u2 >= u1);
assert(u3 >= u1);
// test hash
assert(u1.toHash() != u2.toHash());
assert(u2.toHash() != u3.toHash());
assert(u3.toHash() != u1.toHash());
}
/**
* Write the UUID into `sink` as an ASCII string in the canonical form,
* which is 36 characters in the form "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
* Params:
* sink = OutputRange or writeable array at least 36 entries long
*/
void toString(Writer)(scope Writer sink) const
{
char[36] result = void;
foreach (pos; skipSeq)
result[pos] = '-';
foreach (i, pos; byteSeq)
{
const uint entry = this.data[i];
const uint hi = entry >> 4;
result[pos ] = toChar!char(hi);
const uint lo = (entry) & 0x0F;
result[pos+1] = toChar!char(lo);
}
foreach (i, c; result)
{
static if (__traits(compiles, put(sink, c)))
put(sink, c);
else
sink[i] = cast(typeof(sink[i]))c;
}
}
/**
* Return the UUID as a string in the canonical form.
*/
@trusted pure nothrow string toString() const
{
import std.exception : assumeUnique;
auto result = new char[36];
toString(result);
return result.assumeUnique;
}
///
@safe pure unittest
{
immutable str = "8ab3060e-2cba-4f23-b74c-b52db3bdfb46";
auto id = UUID(str);
assert(id.toString() == str);
}
@safe pure nothrow @nogc unittest
{
import std.meta : AliasSeq;
static foreach (Char; AliasSeq!(char, wchar, dchar))
{{
alias String = immutable(Char)[];
//CTFE
enum String s = "8ab3060e-2cba-4f23-b74c-b52db3bdfb46";
enum id = UUID(s);
static if (is(Char == char))
{
enum p = id.toString();
static assert(s == p);
}
//nogc
Char[36] str;
id.toString(str[]);
assert(str == s);
}}
}
@system pure nothrow @nogc unittest
{
// @system due to cast
import std.encoding : Char = AsciiChar;
enum utfstr = "8ab3060e-2cba-4f23-b74c-b52db3bdfb46";
alias String = immutable(Char)[];
enum String s = cast(String) utfstr;
enum id = UUID(utfstr);
//nogc
Char[36] str;
id.toString(str[]);
assert(str == s);
}
@safe unittest
{
auto u1 = UUID(cast(ubyte[16])[138, 179, 6, 14, 44, 186, 79,
35, 183, 76, 181, 45, 179, 189, 251, 70]);
assert(u1.toString() == "8ab3060e-2cba-4f23-b74c-b52db3bdfb46");
u1 = UUID("8ab3060e-2cba-4f23-b74c-b52db3bdfb46");
assert(u1.toString() == "8ab3060e-2cba-4f23-b74c-b52db3bdfb46");
char[] buf;
void sink(const(char)[] data)
{
buf ~= data;
}
u1.toString(&sink);
assert(buf == "8ab3060e-2cba-4f23-b74c-b52db3bdfb46");
}
}
/**
* This function generates a name based (Version 3) UUID from a namespace UUID and a name.
* If no namespace UUID was passed, the empty UUID $(D UUID.init) is used.
*
* Note:
* The default namespaces ($(LREF dnsNamespace), ...) defined by
* this module should be used when appropriate.
*
* RFC 4122 recommends to use Version 5 UUIDs (SHA-1) instead of Version 3
* UUIDs (MD5) for new applications.
*
* CTFE:
* CTFE is not supported.
*
* Note:
* RFC 4122 isn't very clear on how UUIDs should be generated from names.
* It is possible that different implementations return different UUIDs
* for the same input, so be warned. The implementation for UTF-8 strings
* and byte arrays used by $(D std.uuid) is compatible with Boost's implementation.
* $(D std.uuid) guarantees that the same input to this function will generate
* the same output at any time, on any system (this especially means endianness
* doesn't matter).
*
* Note:
* This function does not provide overloads for wstring and dstring, as
* there's no clear answer on how that should be implemented. It could be
* argued, that string, wstring and dstring input should have the same output,
* but that wouldn't be compatible with Boost, which generates different output
* for strings and wstrings. It's always possible to pass wstrings and dstrings
* by using the ubyte[] function overload (but be aware of endianness issues!).
*/
@safe pure nothrow @nogc UUID md5UUID(const(char[]) name, const UUID namespace = UUID.init)
{
return md5UUID(cast(const(ubyte[]))name, namespace);
}