29 lines
824 B
Nim
29 lines
824 B
Nim
type
|
|
NdString* = ptr object
|
|
len: uint32
|
|
chars: UncheckedArray[char]
|
|
|
|
proc newString*(str: string): NdString =
|
|
let strlen = str.len()
|
|
let len = 4 + strlen
|
|
result = cast[NdString](alloc(len))
|
|
result.len = strlen.uint32
|
|
copyMem(result.chars[0].unsafeAddr, str[0].unsafeAddr, strlen)
|
|
|
|
proc `$`*(ndStr: NdString): string =
|
|
result = newString(ndStr.len.int)
|
|
copyMem(result[0].unsafeAddr, ndStr.chars[0].unsafeAddr, ndStr.len.int)
|
|
|
|
proc `&`*(left, right: NdString): NdString =
|
|
# TODO optimize this later when strings will be benchmarked
|
|
newString($left & $right)
|
|
|
|
proc free*(ndStr: var NdString) =
|
|
dealloc(ndStr)
|
|
|
|
proc hash*(ndStr: NdString): int =
|
|
var hash = 2166136261'u32
|
|
for i in countup(0, ndStr.len.int - 1):
|
|
hash = hash xor (ndStr.chars[i]).uint32
|
|
hash *= 16777619
|
|
return hash.int |