* Regular expressions in Lua.
@ 2012-12-15 0:12 Andre Caldas
2012-12-15 0:57 ` Hans Hagen
0 siblings, 1 reply; 5+ messages in thread
From: Andre Caldas @ 2012-12-15 0:12 UTC (permalink / raw)
To: ConTeXt users
Hi!
I have to use pattern matching in lua. I tried the function "string.gmatch".
I want to match (iterate over) strings of the type
([0-9]+)(-([0-9]*))?(,|$)
For example:
1,3- (iterations: 1 and 3-)
1-3,6,7 (iterations: 1-3 then 6 then 7)
1-2,5-6,10- (iterations 1-2 then 5-6 then 10-)
André Caldas.
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___________________________________________________________________________________
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* Re: Regular expressions in Lua.
2012-12-15 0:12 Regular expressions in Lua Andre Caldas
@ 2012-12-15 0:57 ` Hans Hagen
2012-12-15 1:10 ` Andre Caldas
0 siblings, 1 reply; 5+ messages in thread
From: Hans Hagen @ 2012-12-15 0:57 UTC (permalink / raw)
To: mailing list for ConTeXt users
On 12/15/2012 1:12 AM, Andre Caldas wrote:
> Hi!
>
> I have to use pattern matching in lua. I tried the function "string.gmatch".
> I want to match (iterate over) strings of the type
> ([0-9]+)(-([0-9]*))?(,|$)
> For example:
> 1,3- (iterations: 1 and 3-)
> 1-3,6,7 (iterations: 1-3 then 6 then 7)
> 1-2,5-6,10- (iterations 1-2 then 5-6 then 10-)
function whatever(str,n,action)
action = action or print
for s in string.gmatch(str,"[^,]+") do
local a, b, c = string.match(s,"^(%d+)(%-?)(%d-)$")
if c ~= "" then
for i=tonumber(a),tonumber(c) do
action(i)
end
elseif b ~= "" then
for i=tonumber(a),n or tonumber(a) do
action(i)
end
elseif a then
action(tonumber(a))
end
end
end
whatever("1,3-",5,function(i) print(">>>",i) end)
whatever("1-3,6,7")
whatever("1-2,5-6,10-",30)
-----------------------------------------------------------------
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
| www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
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___________________________________________________________________________________
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Regular expressions in Lua.
2012-12-15 0:57 ` Hans Hagen
@ 2012-12-15 1:10 ` Andre Caldas
2012-12-15 1:47 ` Hans Hagen
0 siblings, 1 reply; 5+ messages in thread
From: Andre Caldas @ 2012-12-15 1:10 UTC (permalink / raw)
To: Hans Hagen; +Cc: mailing list for ConTeXt users
Hello, Hans!
I had just managed to do it. I will switch to yours instead of mine...
I don't have any experience in Lua. Sorry for bothering with such easy
requests...
By the way, simplesteps recognizes number ranges! :-)
https://bitbucket.org/andrecaldas/context-simplesteps/src/1c7ced45208b78289590008760daa3bac05ec503/mod/tex/context/third/simplesteps/simplesteps.lua?at=default#cl-37
Thank you,
André Caldas.
___________________________________________________________________________________
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___________________________________________________________________________________
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* Re: Regular expressions in Lua.
2012-12-15 1:10 ` Andre Caldas
@ 2012-12-15 1:47 ` Hans Hagen
2012-12-15 12:00 ` Andre Caldas
0 siblings, 1 reply; 5+ messages in thread
From: Hans Hagen @ 2012-12-15 1:47 UTC (permalink / raw)
To: Andre Caldas; +Cc: mailing list for ConTeXt users
On 12/15/2012 2:10 AM, Andre Caldas wrote:
> Hello, Hans!
>
> I had just managed to do it. I will switch to yours instead of mine...
> I don't have any experience in Lua. Sorry for bothering with such easy
> requests...
As ranges are sometimes handy I've added a parser to the core (no upload
yet, will happen sometime next week)
-- utilities.parsers.stepper("1,3-",5,function(i) print(">>>",i) end)
-- utilities.parsers.stepper("1-3,6,7")
-- utilities.parsers.stepper("1-3,6,7",function(i) print(">>>",i) end)
-- utilities.parsers.stepper("1:3,6,7")
-- utilities.parsers.stepper(" 1 : 3, ,7 ")
-- utilities.parsers.stepper("1-2,5-6,25-*",30)
So:
- * as optional final value symbol
- optional spaces around : and, and around list
- - as well as :
-----------------------------------------------------------------
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
| www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://tex.aanhet.net
archive : http://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___________________________________________________________________________________
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Regular expressions in Lua.
2012-12-15 1:47 ` Hans Hagen
@ 2012-12-15 12:00 ` Andre Caldas
0 siblings, 0 replies; 5+ messages in thread
From: Andre Caldas @ 2012-12-15 12:00 UTC (permalink / raw)
To: Hans Hagen; +Cc: mailing list for ConTeXt users
Hi!
> As ranges are sometimes handy I've added a parser to the core
Nice. I will use it as soon as it is available.
It is a very good thing that range specifications will be uniform
across different modules.
André Caldas.
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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archive : http://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___________________________________________________________________________________
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2012-12-15 0:12 Regular expressions in Lua Andre Caldas
2012-12-15 0:57 ` Hans Hagen
2012-12-15 1:10 ` Andre Caldas
2012-12-15 1:47 ` Hans Hagen
2012-12-15 12:00 ` Andre Caldas
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