mirror of https://github.com/status-im/nimPNG.git
62 lines
1.4 KiB
Nim
62 lines
1.4 KiB
Nim
import random, sets
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type
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RandGen*[T] = object
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minVal, maxVal: T
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Bytes* = seq[byte]
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proc rng*[T](minVal, maxVal: T): RandGen[T] =
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doAssert(minVal <= maxVal)
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result.minVal = minVal
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result.maxVal = maxVal
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proc rng*[T](minMax: T): RandGen[T] =
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rng(minMax, minMax)
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proc getVal*[T](x: RandGen[T]): T =
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if x.minVal == x.maxVal: return x.minVal
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rand(x.minVal..x.maxVal)
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proc randString*(len: int): string =
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result = newString(len)
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for i in 0..<len:
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result[i] = rand(255).char
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proc randBytes*(len: int): Bytes =
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result = newSeq[byte](len)
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for i in 0..<len:
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result[i] = rand(255).byte
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proc randPrimitives*[T](val: int): T =
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type
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ByteLike = uint8 | byte | char
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when T is string:
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randString(val)
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elif T is int:
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result = val
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elif T is ByteLike:
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result = T(val)
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elif T is Bytes:
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result = randBytes(val)
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proc randList*(T: typedesc, fillGen: RandGen, listLen: int, unique: static[bool] = true): seq[T] =
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result = newSeqOfCap[T](listLen)
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when unique:
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var set = initHashSet[T]()
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for len in 0..<listLen:
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while true:
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let x = randPrimitives[T](fillGen.getVal())
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if x notin set:
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result.add x
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set.incl x
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break
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else:
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for len in 0..<listLen:
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let x = randPrimitives[T](fillGen.getVal())
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result.add x
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proc randList*(T: typedesc, fillGen, listGen: RandGen, unique: static[bool] = true): seq[T] =
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randList(T, fillGen, listGen.getVal(), unique)
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