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Scripting a regular expression creation

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Posted by Shaun Biggs USA (644 posts) Bio

Date Sun 27 May 2007 04:55 PM (UTC)

Message

I'm trying to make an alias to set the prompt and create a trigger which matches on the prompt for Aardwolf. The only difficulty I'm having is with colour codes. Aard uses the @ symbol to denote a colour. The @ and any single character after it is eaten by the parser, except for @~- which are special characters. "@@" = "@", "@~" or "@-" = "~".

I have the following:

Lua 5.1.2  Copyright (C) 1994-2007 Lua.org, PUC-Rio
> s="@CC@cc@@@~@C@@@-asdf"
> for w in string.gmatch(s, "(@.)") do
>>   if w == "@@" then
>>     print("@")
>>   elseif w == "@-" or w == "@~" then
>>     print("~")
>>   end
>> end
@
~
@
~
>

But I would like to have a string where I'm adding the unmatched sections to the modified ones I'm printing. The example string would wind up being "Cc@~@~asdf". For some really strange reason, I'm having a hard time getting my brain around the last step of this :(

It is much easier to fight for one's ideals than to live up to them.

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Posted by Ked Russia (524 posts) Bio

Date Reply #1 on Sun 27 May 2007 05:39 PM (UTC)

Message

It looks like a job for string.gsub(). This produces the needed result:


function fixString(st) 
  return string.gsub(st, "(@.)", 
    function (m) 
      local t = {["@@"] = "@", ["@-"] = "~", ["@~"] = "~"}
      return t[m] or "" 
    end )

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Posted by

Shaun Biggs USA (644 posts) Bio

Date

Reply #2 on Sun 27 May 2007 05:53 PM (UTC)

Message

That works perfectly. Thank you very much.

It is much easier to fight for one's ideals than to live up to them.

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