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