Re: Testing for CamelCase

[Thomas Wrensch <twrensch@...>]

You can use a different pattern and string.find rather than gsub

To find if the word contains a CamelCase string:

    function isCamelCase(str)
      return string.find(str,"%u%l+%u%l[%u%l]*")
    end

(Note that this returns nil if not found and a digit if it is)

To find out if the string contains ONLY a CamelCase word and nothing else, 
anchor the pattern's beginning and end:

    function isCamelCase(str)
      return string.find(str,"^%u%l+%u%l[%u%l]*$")
    end

To fix it so it returns true or false you can use a double not:

    function isCamelCase(str)
      return not not string.find(str,"^%u%l+%u%l[%u%l]*$")
    end

Note that it is very easy to modify the requirements. For example, you can 
allow digits at the end by changing the [%u%l] to %w.

  - Tom

On Mon, 3 Jan 2005, Alex Sandro Queiroz e Silva wrote:

> Date: Mon, 03 Jan 2005 17:56:47 -0300
> From: Alex Sandro Queiroz e Silva <ventonegro@ventonegro.org>
> Reply-To: Lua list <lua@bazar2.conectiva.com.br>
> To: Lua list <lua@bazar2.conectiva.com.br>
> Subject: Testing for CamelCase
>
> Hallo guys,
>
>    I've written the following function to test if a string is in camel case, 
> because Lua patterns don't support modifiers on groupings. It works, but as I 
> have little experience with text processing in Lua, I am posting it here to 
> see if someone comes up with a better solution. Thanks!
>
> -- checks if a string is in CamelCase
> function isCamelCase(str)
>   local count = 0
>   local s = string.gsub(str, "(%u%l+)",
>                       function(n) count = count + 1 return "" end)
>
>   if count < 2 or s ~= "" then
>       return nil
>   else
>       return not nil
>   end
> end
>
> -alex

twrensch@sdf.lonestar.org
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