必要知識：字元編碼
lua中for的原理（描述中有不對的地方望見諒）
**例項：
local utf8changer =
local
function
chsize
(char)
ifnot char then
--print("not char")
return
0elseif char >
240then
return
4elseif char >
225then
return
3elseif char >
192then
return
2else
return
1end
end-- 計算utf8字串字元數, 各種字元都按乙個字元計算
-- 例如utf8len("1你好") => 3
local
function
utf8len
(str)
local len =
0local currentindex =
1while currentindex <=
#str do
local char = string.
byte
(str, currentindex)
currentindex = currentindex +
chsize
(char)
len = len +
1end
return len
end-- 擷取utf8 字串
-- str: 要擷取的字串
-- startchar: 開始字元下標,從1開始
-- numchars: 要擷取的字元長度
local
function
utf8sub
(str, startchar, numchars)
local startindex =
1while startchar >1do
local char = string.
byte
(str, startindex)
--起始的位置
startindex = startindex +
chsize
(char)
startchar = startchar -
1end
local currentindex = startindex
while numchars >
0and currentindex <=
#str do
local char = string.
byte
(str, currentindex)
currentindex = currentindex +
chsize
(char)
numchars = numchars -
1end
return str:
sub(startindex, currentindex -1)
endlocal
function
ipairs
(str)
local startindex =1;
local key =
0local _str = str;
return
function()
if str ==
nilor
#str ==
0then
return
nilend
local char = string.
byte
(str, startindex)
local len =
chsize
(char)
if len ==
0then
return
nilend
local currentindex = startindex + len;
local value = _str:
sub(startindex, currentindex -1)
startindex = startindex + len
key = key +1;
return key, value
endendutf8changer.utf8len = utf8len
utf8changer.utf8sub = utf8sub
utf8changer.ipairs = ipairs
return utf8changer
local utf8changer =
require
("utf8changer"
)local str =
"123,這是我的測試**。"
local ipairs = utf8changer.ipairs
for index, value in
ipairs
(str)
doprint
(index , value)
end
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