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fixes #17768 [backport:1.4] (#18317)

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* fixes #17768 [backport:1.4]

* tiny
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flywind 2021-06-21 18:50:47 +08:00 • committed by GitHub
commit 2deb7011f5
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2 changed files with 12 additions and 7 deletions
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10
lib/pure/unicode.nim
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@ -333,7 +333,7 @@ proc runeReverseOffset*(s: string, rev: Positive): (int, int) =
## from the end (starting with 1) and the total
## number of runes in the string.
##
## Returns a negative value for offset if there are to few runes in
## Returns a negative value for offset if there are too few runes in
## the string to satisfy the request.
##
## **Beware:** This can lead to unoptimized code and slow execution!
@ -346,16 +346,14 @@ proc runeReverseOffset*(s: string, rev: Positive): (int, int) =
a = rev.int
o = 0
x = 0
let times = 2*rev.int-s.runeLen # transformed from rev.int - a < s.runeLen - rev.int
while o < s.len:
let r = runeLenAt(s, o)
o += r
if a < 0:
if a > times:
x += r
dec a
if a > 0:
return (-a, rev.int-a)
return (x, -a+rev.int)
result = if a > 0: (-a, rev.int-a) else: (x, -a+rev.int)
proc runeAtPos*(s: string, pos: int): Rune =
## Returns the rune at position ``pos``.