RE: Problems with: Most efficient way to recognize a line by its first three characters
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- Subject: RE: Problems with: Most efficient way to recognize a line by its first three characters
- From: Thijs Schreijer <thijs@...>
- Date: 2014年3月12日 19:07:43 +0000
> -----Original Message-----
> From: lua-l-bounces@lists.lua.org [mailto:lua-l-bounces@lists.lua.org] On
> Behalf Of meino.cramer@gmx.de
> Sent: woensdag 12 maart 2014 19:49
> To: Lua mailing list
> Subject: Problems with: Most efficient way to recognize a line by its first
> three characters
>
> Hi,
>
> I decided to start a new thread about this, since I think
> I stumbled accross a problem, which not really has something
> to do with the "Most efficient way..." as such.
>
> I asked, whether it is ok to make the format of the data
> public and it is ok -- it was already public (which I didnt know ;)
>
> I am trying to check all the nice suggestion which were
> given in the originating thread (THANK YOU!) and started
> with this code:
>
>
> #! /usr/bin/lua
>
> function scan ()
> local bad=function (prefix,info) print("Not recognized"..prefix) end
> local handlers={
> ["1ドル;"]=function( prefix, info ) print ( "1ドル;") end,
> ["2ドル;"]=function( prefix, info ) print ( "2ドル;") end,
> ["3ドル;"]=function( prefix, info ) print ( "3ドル;") end,
> ["4ドル;"]=function( prefix, info ) print ( "4ドル;") end,
> ["5ドル;"]=function( prefix, info ) print ( "5ドル;") end,
> ["6ドル;"]=function( prefix, info ) print ( "6ドル;") end,
> ["§7;"]=function( prefix, info ) print ( "§7;") end,
> ["§8;"]=function( prefix, info ) print ( "§8;") end,
> ["CFG"]=function( prefix, info ) print ( "CFG") end,
> ["DAT"]=function( prefix, info ) print ( "DAT") end,
> ["KEY"]=function( prefix, info ) print ( "KEY") end,
> ["REF"]=function( prefix, info ) print ( "REF") end,
> ["VER"]=function( prefix, info ) print ( "VER") end
> }
> local f = assert(io.open("/tmp/example.txt","r") )
> local line
>
> while true do
> line = f:read("*line" )
> if not line then break end
> local prefix, info = line:sub(1,3), line:sub(4)
> local h = handlers[prefix] or bad
> h(prefix,info)
> end
> end
>
> scan()
>
>
> Everything works fine...except the recongition of the lines
> beginning with '§'...
What encoding do you use? Remember that `sub(1,3)` returns the first three _bytes_, which are not necessarily 3 characters.
> And I have not a single idea, why...
>
> Thank you very mcuh in advance for any help!
> Best regards,
> mcc
>
>
>