[NTG-context] regular expression as lua pattern

[NTG-context] regular expression as lua pattern

[Pablo Rodriguez via ntg-context]

Dear list,

I have the following sample:

	\starttext
	\startTEXpage[pagestate=start, offset=1em]
	\startluacode
		local str = "this is that"
		context(str:match("(this|these)"))
	\stopluacode
	\stopTEXpage
	\stoptext

In short, I would like to know whether it is possible to have the
regular expression (this|these) as a Lua pattern.

I mean, I need complete strings and I haven’t found the way to do it.

Many thanks for your help,

Pablo
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___________________________________________________________________________________

[NTG-context] Re: regular expression as lua pattern

[Tomáš Hála]

Hi Pablo,

unfortunately, that it is not possible:

http://lua-users.org/wiki/PatternsTutorial, section Limitations.

The best,

Tomáš


On Tue, May 28, 2024 at 06:12:51PM +0200, Pablo Rodriguez via ntg-context wrote:
> Dear list,
> 
> I have the following sample:
> 
> 	\starttext
> 	\startTEXpage[pagestate=start, offset=1em]
> 	\startluacode
> 		local str = "this is that"
> 		context(str:match("(this|these)"))
> 	\stopluacode
> 	\stopTEXpage
> 	\stoptext
> 
> In short, I would like to know whether it is possible to have the
> regular expression (this|these) as a Lua pattern.
> 
> I mean, I need complete strings and I haven’t found the way to do it.
> 
> Many thanks for your help,
> 
> Pablo
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
> 
> maillist : ntg-context@ntg.nl / https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl
> webpage  : https://www.pragma-ade.nl / https://context.aanhet.net (mirror)
> archive  : https://github.com/contextgarden/context
> wiki     : https://wiki.contextgarden.net
> ___________________________________________________________________________________
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl
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wiki     : https://wiki.contextgarden.net
___________________________________________________________________________________

[NTG-context] Re: regular expression as lua pattern

[Pablo Rodriguez via ntg-context]

On 5/28/24 18:25, Tomáš Hála wrote:
> Hi Pablo,
>
> unfortunately, that it is not possible:
>
> http://lua-users.org/wiki/PatternsTutorial, section Limitations.

Many thanks for your reply, Tomáš.

It is clear to me now.

Pablo
___________________________________________________________________________________
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___________________________________________________________________________________

[NTG-context] Re: regular expression as lua pattern

[Hans Hagen]

On 5/28/2024 6:25 PM, Tomáš Hála wrote:
> Hi Pablo,
> 
> unfortunately, that it is not possible:
> 
> http://lua-users.org/wiki/PatternsTutorial, section Limitations.

\starttext
	\startTEXpage[pagestate=start, offset=1em]
         \startluacode
             local pat = (lpeg.Cmt(lpeg.P("this") + lpeg.P("that"), 
function(str,_,s)
                 context(s)
                 return #str
             end) + lpeg.P(1))^1
             lpeg.match(pat,"how about this being that")

             local pat = (lpeg.Cmt(lpeg.oneof({ "this", "that" }), 
function(str,_,s)
                 context(s)
                 return #str
             end) + lpeg.P(1))^1
             lpeg.match(pat,"how about this being that")
         \stopluacode
	\stopTEXpage
\stoptext


> On Tue, May 28, 2024 at 06:12:51PM +0200, Pablo Rodriguez via ntg-context wrote:
>> Dear list,
>>
>> I have the following sample:
>>
>> 	\starttext
>> 	\startTEXpage[pagestate=start, offset=1em]
>> 	\startluacode
>> 		local str = "this is that"
>> 		context(str:match("(this|these)"))
>> 	\stopluacode
>> 	\stopTEXpage
>> 	\stoptext
>>
>> In short, I would like to know whether it is possible to have the
>> regular expression (this|these) as a Lua pattern.
>>
>> I mean, I need complete strings and I haven’t found the way to do it.
>>
>> Many thanks for your help,
>>
>> Pablo
>> ___________________________________________________________________________________
>> If your question is of interest to others as well, please add an entry to the Wiki!
>>
>> maillist : ntg-context@ntg.nl / https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl
>> webpage  : https://www.pragma-ade.nl / https://context.aanhet.net (mirror)
>> archive  : https://github.com/contextgarden/context
>> wiki     : https://wiki.contextgarden.net
>> ___________________________________________________________________________________
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
> 
> maillist : ntg-context@ntg.nl / https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl
> webpage  : https://www.pragma-ade.nl / https://context.aanhet.net (mirror)
> archive  : https://github.com/contextgarden/context
> wiki     : https://wiki.contextgarden.net
> ___________________________________________________________________________________

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___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl
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wiki     : https://wiki.contextgarden.net
___________________________________________________________________________________

[NTG-context] Re: regular expression as lua pattern

[Henning Hraban Ramm]

Am 28.05.24 um 20:06 schrieb Hans Hagen:
> On 5/28/2024 6:25 PM, Tomáš Hála wrote:
>> Hi Pablo,
>>
>> unfortunately, that it is not possible:
>>
>> http://lua-users.org/wiki/PatternsTutorial, section Limitations.
> 
> \starttext
>      \startTEXpage[pagestate=start, offset=1em]
>          \startluacode
>              local pat = (lpeg.Cmt(lpeg.P("this") + lpeg.P("that"), 
> function(str,_,s)
>                  context(s)
>                  return #str
>              end) + lpeg.P(1))^1
>              lpeg.match(pat,"how about this being that")
> 
>              local pat = (lpeg.Cmt(lpeg.oneof({ "this", "that" }), 
> function(str,_,s)
>                  context(s)
>                  return #str
>              end) + lpeg.P(1))^1
>              lpeg.match(pat,"how about this being that")
>          \stopluacode
>      \stopTEXpage
> \stoptext

See also Taco’s introduction to LPEG in 
https://articles.contextgarden.net/journal/2019/77-98.pdf

Hraban


___________________________________________________________________________________
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maillist : ntg-context@ntg.nl / https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl
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___________________________________________________________________________________

[NTG-context] Re: regular expression as lua pattern

[Pablo Rodriguez via ntg-context]

On 5/28/24 20:06, Hans Hagen wrote:
> On 5/28/2024 6:25 PM, Tomáš Hála wrote:
>> Hi Pablo,
>>
>> unfortunately, that it is not possible:
>>
>> http://lua-users.org/wiki/PatternsTutorial, section Limitations.
>
> \starttext
> 	\startTEXpage[pagestate=start, offset=1em]
>          \startluacode
>              local pat = (lpeg.Cmt(lpeg.P("this") + lpeg.P("that"),
> function(str,_,s)
>                  context(s)
>                  return #str
>              end) + lpeg.P(1))^1
>              lpeg.match(pat,"how about this being that")
>
>              local pat = (lpeg.Cmt(lpeg.oneof({ "this", "that" }),
> function(str,_,s)
>                  context(s)
>                  return #str
>              end) + lpeg.P(1))^1
>              lpeg.match(pat,"how about this being that")
>          \stopluacode
> 	\stopTEXpage
> \stoptext

Many thanks for your reply, Hans.

I will have to study it becasue LPEGs is new stuff for me.

Many thanks for your help,

Pablo

___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl
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___________________________________________________________________________________

[NTG-context] Re: regular expression as lua pattern

[Pablo Rodriguez via ntg-context]

On 5/29/24 13:00, Henning Hraban Ramm wrote:
> [...]
> See also Taco’s introduction to LPEG in
> https://articles.contextgarden.net/journal/2019/77-98.pdf

Many thanks for the reference, Hraban.

I need to start digesting that to learn about LPEG.

Pablo
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl
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archive  : https://github.com/contextgarden/context
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___________________________________________________________________________________