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‎.github/workflows/src.yml

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on:
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push:
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paths:
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- 'src/**'
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jobs:
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src:
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v2
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- uses: aviate-labs/setup-dfx@v0.2.2
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with:
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dfx-version: 0.8.0
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install-moc: true
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vessel-version: 0.6.2
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- run: for i in src/*.mo ; do moc $(vessel sources) --check $i ; done

‎.github/workflows/test.yml

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on:
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push:
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paths:
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- 'test/**'
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jobs:
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src:
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v2
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- uses: aviate-labs/setup-dfx@v0.2.2
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with:
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dfx-version: 0.8.0
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install-moc: true
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vessel-version: 0.6.2
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- run: for i in test/*.mo ; do moc $(vessel sources) -r $i ; done

‎.gitignore

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.vessel/

‎LICENSE

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Apache License
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http://www.apache.org/licenses/
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See the License for the specific language governing permissions and
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limitations under the License.

‎README.md

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# UUID
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Generation of UUIDs based on [RFC 4122](https://datatracker.ietf.org/doc/html/rfc4122).
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## Usage
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```motoko
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let g = uuid.Generator();
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uuid.toText(g.new());
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// F253F1F0-2885-169F-169F-2885F253F1F0
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```

‎package-set.dhall

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let upstream = https://github.com/dfinity/vessel-package-set/releases/download/mo-0.6.7-20210818/package-set.dhall sha256:c4bd3b9ffaf6b48d21841545306d9f69b57e79ce3b1ac5e1f63b068ca4f89957
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let Package = { name : Text, version : Text, repo : Text, dependencies : List Text }
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let additions = [
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{ name = "encoding"
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, repo = "https://github.com/aviate-labs/encoding.mo"
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, version = "v0.2.0"
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, dependencies = ["base"]
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}
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] : List Package
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in upstream # additions

‎src/UUID.mo

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import Array "mo:base/Array";
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import Int "mo:base/Int";
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import List "mo:base/List";
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import Nat16 "mo:base/Nat16";
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import Nat32 "mo:base/Nat32";
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import Nat64 "mo:base/Nat64";
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import Time "mo:base/Time";
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import Hex "mo:encoding/Hex";
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import Binary "mo:encoding/Binary";
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module {
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public type UUID = [Nat8];
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// Converts the UUID to its textual representation.
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public func toText(uuid : UUID) : Text {
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var t = "";
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let xs = List.fromArray(uuid);
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let (p0, xs0) = List.split(4, xs);
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t #= Hex.encode(List.toArray(p0)) # "-";
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let (p1, xs1) = List.split(2, xs0);
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t #= Hex.encode(List.toArray(p1)) # "-";
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let (p2, xs2) = List.split(2, xs1);
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t #= Hex.encode(List.toArray(p2)) # "-";
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let (p3, xs3) = List.split(2, xs2);
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t # Hex.encode(List.toArray(p3)) # "-" # Hex.encode(List.toArray(xs3));
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};
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public class Generator() {
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private let lillian : Nat64 = 2299160; // Julian day of 15 Oct 1582.
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private let unix : Nat64 = 2440587; // Julian day of 1 Jan 1970.
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private let epoch : Nat64 = unix - lillian; // Days between epochs.
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private let g1582 : Nat64 = epoch * 86400; // Seconds between epochs.
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private let g1582ns100 : Nat64 = g1582 * 10000000; // 100s of a nanoseconds between epochs.
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private var lastTime : Nat64 = 0;
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private var clockSequence : Nat16 = 0;
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// Generates a new UUID.
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public func new() : UUID {
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let (now, clock) = time();
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let low = Nat32.fromNat(Nat64.toNat(now & 0xFFFFFFFF));
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let mid = Nat16.fromNat(Nat64.toNat((now >> 32) & 0xFFFF));
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let high = Nat16.fromNat(Nat64.toNat((now >> 48) & 0x0FFF)) | 0x1000;
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Array.append(
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Array.append(
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Binary.BigEndian.fromNat32(low),
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Binary.BigEndian.fromNat16(mid),
49+
),
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Array.append(
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Binary.BigEndian.fromNat16(high),
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Binary.BigEndian.fromNat64(now),
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),
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);
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};
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private func time() : (Nat64, Nat16) {
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let t = Nat64.fromNat(Int.abs(Time.now()));
59+
if (clockSequence == 0) {
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// TODO: Randomize clock sequence.
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};
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let now = t/100 + g1582ns100;
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if (now <= lastTime) {
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clockSequence := ((clockSequence + 1) & 0x3fff) | 0x8000;
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};
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lastTime := now;
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(t, clockSequence);
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};
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};
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};

‎test/UUID.mo

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import UUID "../src/UUID";
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let g = UUID.Generator();
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// For some reason Time.now() always returns +42...
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assert(UUID.toText(g.new()) == "0000002A-0000-1000-0000-00000000002A")

‎vessel.dhall

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{
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dependencies = [ "base", "encoding" ],
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compiler = None Text
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}

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