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make cstrutils work in VM (#16590)

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* make cstrutils work in VM

* more
This commit is contained in:
flywind 2021-01-05 10:52:26 -06:00 • committed by GitHub
commit c04f305bf7
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4 changed files with 132 additions and 104 deletions
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29
lib/std/private/strimpl.nim
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@ -4,13 +4,13 @@ func toLowerAscii*(c: char): char {.inline.} =
else:
result = c
template firstCharCaseSensitiveImpl(a, b: typed, aLen, bLen: int) =
template firstCharCaseSensitiveImpl[T: string | cstring](a, b: T, aLen, bLen: int) =
if aLen == 0 or bLen == 0:
return aLen - bLen
if a[0] != b[0]: return ord(a[0]) - ord(b[0])
template cmpIgnoreStyleImpl*(a, b: typed, firstCharCaseSensitive: static bool = false) =
# a, b are string or cstring
template cmpIgnoreStyleImpl*[T: string | cstring](a, b: T,
firstCharCaseSensitive: static bool = false) =
let aLen = a.len
let bLen = b.len
var i = 0
@ -37,8 +37,8 @@ template cmpIgnoreStyleImpl*(a, b: typed, firstCharCaseSensitive: static bool =
inc i
inc j
template cmpIgnoreCaseImpl*(a, b: typed, firstCharCaseSensitive: static bool = false) =
# a, b are string or cstring
template cmpIgnoreCaseImpl*[T: string | cstring](a, b: T,
firstCharCaseSensitive: static bool = false) =
let aLen = a.len
let bLen = b.len
var i = 0
@ -51,3 +51,22 @@ template cmpIgnoreCaseImpl*(a, b: typed, firstCharCaseSensitive: static bool = f
if result != 0: return
inc i
result = aLen - bLen
template startsWithImpl*[T: string | cstring](s, prefix: T) =
let prefixLen = prefix.len
let sLen = s.len
var i = 0
while true:
if i >= prefixLen: return true
if i >= sLen or s[i] != prefix[i]: return false
inc(i)
template endsWithImpl*[T: string | cstring](s, suffix: T) =
let suffixLen = suffix.len
let sLen = s.len
var i = 0
var j = sLen - suffixLen
while i+j >= 0 and i+j < sLen:
if s[i+j] != suffix[i]: return false
inc(i)
if i >= suffixLen: return true