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Avoid doing stridx twice

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Balakrishnan Balasubramanian
2025-09-15 01:19:21 -04:00
parent 7b8f3f7a5e
commit 8b5cdee1c0
1 changed files with 13 additions and 10 deletions
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23
lc.vim
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@@ -5,26 +5,29 @@ class Item
const val: string
endclass
def GetLongestSuffix(hay: string, ndl: string): string
def GetLongestSuffix(hay: string, ndl: string): tuple<string, number>
var s = ndl
var l = len(ndl)
while stridx(hay, s) == -1
s = strpart(s, 1)
while true
const idx = stridx(hay, s)
if idx != -1
return (s, idx)
endif
l = l - 1
if l == 0
return ""
break
endif
s = strpart(s, 1)
endwhile
return s
return ("", 0)
enddef
# echo GetLongestSuffix("hello world", "world")->assert_equal("world")
# echo GetLongestSuffix("hello world", "foo world")->assert_equal("o world")
# echo GetLongestSuffix("hello world foo bar blah", "foo world")->assert_equal("o world")
# echo GetLongestSuffix("hello world", "world")->assert_equal(("world", 6))
# echo GetLongestSuffix("hello world", "foo world")->assert_equal(("o world", 4))
# echo GetLongestSuffix("hello world foo bar blah", "foo world")->assert_equal(("o world", 4))
# echo v:errors
def GetMatch(base: string, line: string): Item
const s = GetLongestSuffix(line, base)
const idx = stridx(line, s)
const [s, idx] = GetLongestSuffix(line, base)
const slen = strlen(s)
const m = strpart(line, idx + slen)
return Item.new(slen, base .. m)