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* std/rand: Add. * wdte: Update some dependencies.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,139 @@ | ||
| // Package rand provides functions for generating and dealing with | ||
| // random numbers. | ||
| package rand | ||
|
|
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| import ( | ||
| crand "crypto/rand" | ||
| "encoding/binary" | ||
| "math/rand" | ||
|
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| "github.com/DeedleFake/wdte" | ||
| "github.com/DeedleFake/wdte/auto" | ||
| "github.com/DeedleFake/wdte/std" | ||
| "github.com/DeedleFake/wdte/std/stream" | ||
| ) | ||
|
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| // A Source is a WDTE function that can create successive random | ||
| // numbers. | ||
| type Source interface { | ||
| wdte.Func | ||
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| // Next returns the next random number from the generator. | ||
| Next() wdte.Number | ||
| } | ||
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| // Next is a WDTE function with the following signature: | ||
| // | ||
| // next source | ||
| // | ||
| // It creates and returns the next random number from the given | ||
| // source. | ||
| func Next(frame wdte.Frame, args ...wdte.Func) wdte.Func { | ||
| frame = frame.Sub("next") | ||
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| if len(args) == 0 { | ||
| return wdte.GoFunc(Next) | ||
| } | ||
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| r := args[0].Call(frame).(Source) | ||
| return r.Next() | ||
| } | ||
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| type source struct { | ||
| rand *rand.Rand | ||
| } | ||
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| func (s *source) Call(frame wdte.Frame, args ...wdte.Func) wdte.Func { | ||
| return s | ||
| } | ||
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| func (s *source) Next() wdte.Number { | ||
| return wdte.Number(s.rand.Float64()) | ||
| } | ||
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| func (s *source) Reflect(name string) bool { | ||
| return name == "Source" | ||
| } | ||
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| func (s *source) String() string { | ||
| return "<source>" | ||
| } | ||
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| // Gen is a WDTE function with the following signature: | ||
| // | ||
| // gen seed | ||
| // | ||
| // It returns a new Source that starts with the given seed. | ||
| func Gen(frame wdte.Frame, args ...wdte.Func) wdte.Func { | ||
| frame = frame.Sub("gen") | ||
|
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| if len(args) == 0 { | ||
| return wdte.GoFunc(Gen) | ||
| } | ||
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| seed := args[0].Call(frame).(wdte.Number) | ||
| return &source{rand: rand.New(rand.NewSource(int64(seed)))} | ||
| } | ||
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| type urand struct{} | ||
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| func (urand) Int63() int64 { | ||
| var r uint64 | ||
| err := binary.Read(crand.Reader, binary.LittleEndian, &r) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
| return int64(r &^ (0x1 << 63)) | ||
| } | ||
|
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| func (urand) Seed(int64) {} | ||
|
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| // UGen is a WDTE function with the following signature: | ||
| // | ||
| // ugen | ||
| // | ||
| // It returns a Source that creates numbers from the operating | ||
| // system's cryptographic random number generator. | ||
| func UGen(frame wdte.Frame, args ...wdte.Func) wdte.Func { | ||
| frame = frame.Sub("ugen") | ||
| return &source{rand: rand.New(urand{})} | ||
| } | ||
|
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| // Stream is a WDTE function with the following signature: | ||
| // | ||
| // stream source num | ||
| // | ||
| // It returns a Stream that yields the given number of random numbers | ||
| // from the provided Source. | ||
| func Stream(frame wdte.Frame, args ...wdte.Func) wdte.Func { | ||
| frame = frame.Sub("stream") | ||
|
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| if len(args) < 2 { | ||
| return auto.SaveArgsReverse(wdte.GoFunc(Stream), args...) | ||
| } | ||
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| r := args[0].Call(frame).(Source) | ||
| rem := int(args[1].Call(frame).(wdte.Number)) | ||
|
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| return stream.NextFunc(func(frame wdte.Frame) (wdte.Func, bool) { | ||
| if rem <= 0 { | ||
| return nil, false | ||
| } | ||
| rem-- | ||
|
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| return r.Next(), true | ||
| }) | ||
| } | ||
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| // Scope is a scope containing the functions in this package. | ||
| var Scope = wdte.S().Map(map[wdte.ID]wdte.Func{ | ||
| "gen": wdte.GoFunc(Gen), | ||
| "ugen": wdte.GoFunc(UGen), | ||
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| "next": wdte.GoFunc(Next), | ||
| "stream": wdte.GoFunc(Stream), | ||
| }) | ||
|
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| func init() { | ||
| std.Register("rand", Scope) | ||
| } |
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