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|
use "alloc"
use "chartype"
use "die"
use "sleq"
use "slpush"
use "types"
use "utf"
pkg std =
const strhash : (s : byte[:] -> uint32)
const streq : (a : byte[:], b : byte[:] -> bool)
const strcasehash : (s : byte[:] -> uint32)
const strcaseeq : (a : byte[:], b : byte[:] -> bool)
generic ptrhash : (p : @a# -> uint32)
generic ptreq : (a : @a#, b : @a# -> bool)
generic inthash : (v : @a::(integral,numeric) -> uint32)
generic inteq : (a : @a::(integral,numeric), b : @a::(integral,numeric) -> bool)
const murmurhash2 : (data : byte[:], seed : uint32 -> uint32)
generic slhash : (sl : @a[:] -> uint32)
;;
const Seed = 1234
generic slhash = {data : @a[:]
-> strhash(slbytes(data))
}
generic slbytes = {data : @a[:]
var n
n = data.len * sizeof(@a)
-> (data : byte#)[:n]
}
const strhash = {s
-> murmurhash2(s, Seed)
}
const strcaseeq = {a, b
var ca, cb
while true
if a.len == 0 || b.len == 0
break
;;
(ca, a) = std.strstep(a)
(cb, b) = std.strstep(b)
if std.tolower(ca) != std.tolower(cb)
-> false
;;
;;
-> a.len == b.len
}
const strcasehash = {s
var chars
var c, h
chars = [][:]
while s.len != 0
(c, s) = std.strstep(s)
std.slpush(&chars, std.tolower(c))
;;
h = murmurhash2(slbytes(chars), Seed)
slfree(chars)
-> h
}
const streq = {a, b
-> sleq(a, b)
}
generic ptrhash = {p : @a#
var x
x = (&p : byte#)
-> murmurhash2(x[0:sizeof(@a#)], Seed)
}
generic ptreq = {a, b
-> a == b
}
generic inthash = {v : @a::(integral,numeric)
var p
p = (&v : byte#)
-> murmurhash2(p[0:sizeof(@a)], Seed)
}
generic inteq = {a, b
-> a == b
}
const murmurhash2 = {data, seed
const m = 0x5bd1e995;
const r = 24
var h, k
h = seed ^ data.len
while data.len >= 4
k = (data[0] : uint32)
k |= (data[1] : uint32) << 8
k |= (data[2] : uint32) << 16
k |= (data[3] : uint32) << 24
k *= m
k ^= k >> r
k *= m
h *= m
h ^= k
data = data[4:]
;;
match data.len
| 3:
h ^= (data[2] : uint32) << 16
h ^= (data[1] : uint32) << 8
h ^= (data[0] : uint32)
h *= m
| 2:
h ^= (data[1] : uint32) << 8
h ^= (data[0] : uint32)
h *= m
| 1:
h ^= (data[0] : uint32)
h *= m
| 0: /* nothing */
| _: die("0 < len < 4 must be true")
;;
h ^= h >> 13
h *= m
h ^= h >> 15
-> h
}
|
