RE: split method?

[Dave Collins <Dave.Collins@...>]

Looks like my split technique doesn’t work on "."


function string:split(delimiter)
	local result = { }   
	local from  = 1   
	local delim_from, delim_to = string.find( self, delimiter, from  )   
	while delim_from do     
		table.insert( result, string.sub( self, from , delim_from-1 ) )     
		from  = delim_to + 1     
		delim_from, delim_to = string.find( self, delimiter, from  )   
	end   
	table.insert( result, string.sub( self, from  ) )   
	return result 
end


local foo = "foo-bar"
dump_table(foo:split("-"))

1=foo
2=bar

local foo = "foo~bar"
dump_table(foo:split("~"))

1=foo
2=bar

local foo = "foo.bar"
dump_table(foo:split("."))

1=
2=
3=
4=
5=
6=
7=
8=

Sigh. Back to the drawing board...



 
Dave Collins
Front-End Engineer
Mercatus Technologies Inc.
60 Adelaide Street East, Suite 700
Toronto ON M5C 3E4
T  416 603 3406 x 298
F  416 603 1790

dave.collins@mercatustechnologies.com
www.mercatustechnologies.com

-----Original Message-----
From: lua-l-bounces@lists.lua.org [mailto:lua-l-bounces@lists.lua.org] On Behalf Of Norbert Kiesel
Sent: Monday, June 27, 2011 2:06 PM
To: lua-l@lists.lua.org
Subject: Re: split method?

On Mon, 2011-06-27 at 12:37 -0400, Dave Collins wrote:
> I’ve used this split (string to table) method I found here:
> http://stackoverflow.com/questions/1426954/split-string-in-lua.
> 
>  
> 
> I’ve got it working, but I don’t understand it.

Read the manual again, especially the part about Function calls (2.5.8).

> 
>  
> 
> function string:split(delimiter)
> 
>       local result = { }   
> 
>       local from  = 1   
> 
>       local delim_from, delim_to = string.find( self, delimiter, from
> )   
> 
>       while delim_from do     
> 
>             table.insert( result, string.sub( self, from ,
> delim_from-1 ) )     
> 
>             from  = delim_to + 1     
> 
>             delim_from, delim_to = string.find( self, delimiter, from
> )   
> 
>       end   
> 
>       table.insert( result, string.sub( self, from  ) )   
> 
>       return result 
> 
> end 
> 
>  
> 
> This is how I’m calling it:
> 
>  
> 
> local myDateString = "2011-06-21"
> 
> local myDateTbl = myDateString.split(myDateString,"-")

You could (should?) call it like that:

local myDateTbl = myDateString:split("-")

Function definitions using : add an implicit first parameter called
"self".  Again, read section 2.5.8 of the manual (or the relevant
sections from the wonderful Lua Wiki).

</nk>