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func toLowerAscii*(c: char): char {.inline.} =
if c in {'A'..'Z'}:
result = chr(ord(c) + (ord('a') - ord('A')))
else:
result = c
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*[T: string | cstring](a, b: T,
firstCharCaseSensitive: static bool = false) =
let aLen = a.len
let bLen = b.len
var i = 0
var j = 0
when firstCharCaseSensitive:
firstCharCaseSensitiveImpl(a, b, aLen, bLen)
inc i
inc j
while true:
while i < aLen and a[i] == '_': inc i
while j < bLen and b[j] == '_': inc j
let aa = if i < aLen: toLowerAscii(a[i]) else: '\0'
let bb = if j < bLen: toLowerAscii(b[j]) else: '\0'
result = ord(aa) - ord(bb)
if result != 0: return result
# the characters are identical:
if i >= aLen:
# both cursors at the end:
if j >= bLen: return 0
# not yet at the end of 'b':
return -1
elif j >= bLen:
return 1
inc i
inc j
template cmpIgnoreCaseImpl*[T: string | cstring](a, b: T,
firstCharCaseSensitive: static bool = false) =
let aLen = a.len
let bLen = b.len
var i = 0
when firstCharCaseSensitive:
firstCharCaseSensitiveImpl(a, b, aLen, bLen)
inc i
var m = min(aLen, bLen)
while i < m:
result = ord(toLowerAscii(a[i])) - ord(toLowerAscii(b[i]))
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
func cmpNimIdentifier*[T: string | cstring](a, b: T): int =
cmpIgnoreStyleImpl(a, b, true)
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