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Refactored rtrim and ltrim to use _whitespace_bytes table

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This commit is contained in:
Alvaro Frias 2021-04-12 12:38:03 -03:00
parent 6042e3a705
commit dbadd9af83
1 changed files with 22 additions and 20 deletions
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42
stringx.lua
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@ -216,31 +216,33 @@ function stringx.trim(s)
end
function stringx.ltrim(s)
if s == "" or s == string.rep(" ", s:len()) then return "" end
local head = 1
for i = 1, #s do
local c = s:sub(i, i)
if c ~= " " then
head = i
break
end
end
return s:sub(head)
if s == "" or s == string.rep(" ", s:len()) then
return ""
end
local head = 1
for i = 1, #s do
if not _whitespace_bytes[s:byte(i)] then
head = i
break
end
end
return s:sub(head)
end
function stringx.rtrim(s)
if s == "" or s == string.rep(" ", s:len()) then return "" end
local tail = #s
for i=#s, 1 do
local c = s:sub(i, i)
if c ~= " " then
tail = i
break
end
if s == "" or s == string.rep(" ", s:len()) then
return ""
end
local tail = #s
for i = #s, 1, -1 do
if not _whitespace_bytes[s:byte(i)] then
tail = i
break
end
end
return s:sub(1, tail)
end