catch % in gsub("%", "\\letterpercent")

catch % in gsub("%", "\\letterpercent")

[Pablo Rodriguez]

Dear list,

I have and \xmlraw command that gives some text with percent signs.
ConTeXt parses them as comments (so no output).

Using Lua gsub(), I need to replace something like:

  string.gsub([[\xmlraw{#1}{.}]], "%", "\\letterpercent")

How do I need to invoke % to get the character found?

Many thanks for your help,

Pablo
--
http://www.ousia.tk
___________________________________________________________________________________
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://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: catch % in gsub("%", "\\letterpercent")

[Taco Hoekwater]

[-- Attachment #1.1: Type: text/plain, Size: 483 bytes --]

Hi,

> On 27 Aug 2020, at 17:11, Pablo Rodriguez <oinos@gmx.es> wrote:
> 
> Dear list,
> 
> I have and \xmlraw command that gives some text with percent signs.
> ConTeXt parses them as comments (so no output).
> 
> Using Lua gsub(), I need to replace something like:
> 
>  string.gsub([[\xmlraw{#1}{.}]], "%", "\\letterpercent")

Double it: %%

See also https://www.lua.org/manual/5.3/manual.html#6.4.1 , but the mention of %% is a bit hidden.

Best wishes,
Taco

[-- Attachment #1.2: Type: text/html, Size: 992 bytes --]

[-- Attachment #2: Type: text/plain, Size: 493 bytes --]

___________________________________________________________________________________
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://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: catch % in gsub("%", "\\letterpercent")

[Hans van der Meer]

[-- Attachment #1.1: Type: text/plain, Size: 1153 bytes --]

In Lua patterns % is a socalled magic character like ^$ etc. These are esacped with a %. Thus %% is what you need in the first string.
dr. Hans van der Meer


> On 27 Aug 2020, at 17:11, Pablo Rodriguez <oinos@gmx.es> wrote:
> 
> Dear list,
> 
> I have and \xmlraw command that gives some text with percent signs.
> ConTeXt parses them as comments (so no output).
> 
> Using Lua gsub(), I need to replace something like:
> 
>  string.gsub([[\xmlraw{#1}{.}]], "%", "\\letterpercent")
> 
> How do I need to invoke % to get the character found?
> 
> Many thanks for your help,
> 
> Pablo
> --
> http://www.ousia.tk
> ___________________________________________________________________________________
> 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://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________


[-- Attachment #1.2: Type: text/html, Size: 2754 bytes --]

[-- Attachment #2: Type: text/plain, Size: 493 bytes --]

___________________________________________________________________________________
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://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: catch % in gsub("%", "\\letterpercent")

[Pablo Rodriguez]

On 8/27/20 5:30 PM, Taco Hoekwater wrote:
>> [...]
>> Using Lua gsub(), I need to replace something like:
>>
>>  string.gsub([[\xmlraw{#1}{.}]], "%", "\\letterpercent")
>
> Double it: %%
>
> See also https://www.lua.org/manual/5.3/manual.html#6.4.1 , but the
> mention of %% is a bit hidden.

Many thanks for your replies, Taco and Hans.

I’m afraid this doesn’t work (and I need \xmlraw there):

  \startbuffer[demo]
  <html>
   <body>
     <div id="First">
     <p>The <span class="special">% best</span> paragraph.</p>
     </div>
   </body>
  </html>
  \stopbuffer

  \startxmlsetups xml:initialize
    \xmlsetsetup{#1}{html}{xml:gen}
  \stopxmlsetups

  \xmlregistersetup{xml:initialize}

  \startxmlsetups xml:gen
    \startitemize
    \xmlfilter{#1}{/**/span[@class='special']/command(xml:special)}
    \stopitemize
  \stopxmlsetups

  \startxmlsetups xml:special
    \startitem
    \cldcontext{string.gsub([[\xmlraw{#1}{.}]], "%%",
       "\\letterpercent")}
    \stopitem
  \stopxmlsetups

  \starttext
    \xmlprocessbuffer{main}{demo}{}
  \stoptext

What am I missing or doing wrong there?

Many thanks for your help,

Pablo
--
http://www.ousia.tk
___________________________________________________________________________________
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://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: catch % in gsub("%", "\\letterpercent")

[Wolfgang Schuster]

Pablo Rodriguez schrieb am 27.08.2020 um 17:56:
> On 8/27/20 5:30 PM, Taco Hoekwater wrote:
>>> [...]
>>> Using Lua gsub(), I need to replace something like:
>>>
>>>   string.gsub([[\xmlraw{#1}{.}]], "%", "\\letterpercent")
>>
>> Double it: %%
>>
>> See also https://www.lua.org/manual/5.3/manual.html#6.4.1 , but the
>> mention of %% is a bit hidden.
> 
> Many thanks for your replies, Taco and Hans.
> 
> I’m afraid this doesn’t work (and I need \xmlraw there):
> 
>    \startbuffer[demo]
>    <html>
>     <body>
>       <div id="First">
>       <p>The <span class="special">% best</span> paragraph.</p>
>       </div>
>     </body>
>    </html>
>    \stopbuffer
> 
>    \startxmlsetups xml:initialize
>      \xmlsetsetup{#1}{html}{xml:gen}
>    \stopxmlsetups
> 
>    \xmlregistersetup{xml:initialize}
> 
>    \startxmlsetups xml:gen
>      \startitemize
>      \xmlfilter{#1}{/**/span[@class='special']/command(xml:special)}
>      \stopitemize
>    \stopxmlsetups
> 
>    \startxmlsetups xml:special
>      \startitem
>      \cldcontext{string.gsub([[\xmlraw{#1}{.}]], "%%",
>         "\\letterpercent")}
>      \stopitem
>    \stopxmlsetups


This works fine with your example

\startxmlsetups xml:special
     \startitem
     \xmlflush{#1}
     \stopitem
\stopxmlsetups

and to escape special characters you can use context.escape()

\startxmlsetups xml:special
     \startitem
     \cldcontext{context.escape([[\xmlraw{#1}{.}]])}
     \stopitem
\stopxmlsetups

Wolfgang
___________________________________________________________________________________
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://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: catch % in gsub("%", "\\letterpercent")

[Pablo Rodriguez]

On 8/27/20 6:16 PM, Wolfgang Schuster wrote:
> Pablo Rodriguez schrieb am 27.08.2020 um 17:56:
>> [...]
>>    \startxmlsetups xml:special
>>      \startitem
>>      \cldcontext{string.gsub([[\xmlraw{#1}{.}]], "%%",
>>         "\\letterpercent")}
>>      \stopitem
>>    \stopxmlsetups
> [...]
> and to escape special characters you can use context.escape()

Many thanks for your reply, Wolfgang.

I’m afraid that I need to keep $ in order to get some formulas:

\cldcontext{(string.gsub([[\xmlraw{#1}{.}]],
  '<span class="'..'math inline'..'">', '$'):gsub("</span>",
  "\\ifmmode $\\fi"))}}

Actually this is way more complex, but I need to catch % and have to
substitution above.

Many thanks for your help,

Pablo
--
http://www.ousia.tk
___________________________________________________________________________________
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://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: catch % in gsub("%", "\\letterpercent")

[Wolfgang Schuster]

Pablo Rodriguez schrieb am 27.08.2020 um 19:16:
> On 8/27/20 6:16 PM, Wolfgang Schuster wrote:
>> Pablo Rodriguez schrieb am 27.08.2020 um 17:56:
>>> [...]
>>>     \startxmlsetups xml:special
>>>       \startitem
>>>       \cldcontext{string.gsub([[\xmlraw{#1}{.}]], "%%",
>>>          "\\letterpercent")}
>>>       \stopitem
>>>     \stopxmlsetups
>> [...]
>> and to escape special characters you can use context.escape()
> Many thanks for your reply, Wolfgang.
>
> I’m afraid that I need to keep $ in order to get some formulas:
>
> \cldcontext{(string.gsub([[\xmlraw{#1}{.}]],
>    '<span class="'..'math inline'..'">', '$'):gsub("</span>",
>    "\\ifmmode $\\fi"))}}
>
> Actually this is way more complex, but I need to catch % and have to
> substitution above.

You have to replace %% with \letterpercent\letterpercent because you're 
still playing with TeX rules.

\startxmlsetups xml:special
     \startitem
\cldcontext{string.gsub("\xmlraw{#1}{.}","\letterpercent\letterpercent","\\letterpercent{}")}
     \stopitem
\stopxmlsetups

To avoid these limitations create a new Lua function and call only this 
function in the setup:

\startluacode

moduledata = moduledata or { }

function moduledata.special(str)
     return string.gsub(str,"%%","\\letterpercent{}")
end

\stopluacode

\startxmlsetups xml:special
     \startitem
     \cldcontext{moduledata.special([[\xmlraw{#1}{.}]])}
     \stopitem
\stopxmlsetups

Wolfgang

___________________________________________________________________________________
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://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: catch % in gsub("%", "\\letterpercent")

[Pablo Rodriguez]

On 8/27/20 7:35 PM, Wolfgang Schuster wrote:
> [...]
> You have to replace %% with \letterpercent\letterpercent because you're
> still playing with TeX rules.
>
> \startxmlsetups xml:special
>      \startitem
> \cldcontext{string.gsub("\xmlraw{#1}{.}","\letterpercent\letterpercent","\\letterpercent{}")}
>      \stopitem
> \stopxmlsetups

Many thanks for your reply, Wolfgang.

Now I understand what was going on.

> To avoid these limitations create a new Lua function and call only this
> function in the setup:
>
> \startluacode
>
> moduledata = moduledata or { }
>
> function moduledata.special(str)
>      return string.gsub(str,"%%","\\letterpercent{}")
> end
>
> \stopluacode
>
> \startxmlsetups xml:special
>      \startitem
>      \cldcontext{moduledata.special([[\xmlraw{#1}{.}]])}
>      \stopitem
> \stopxmlsetups

Now I see that I have a lot to learn.

Many thanks again for your help,

Pablo
--
http://www.ousia.tk
___________________________________________________________________________________
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://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________