deeptextcommand and firstcharacter

deeptextcommand and firstcharacter

[Thangalin]

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Hi,

The attached file does not compile in ConTeXt.

However, if the \placeindex is substituted for \completeindex, then the
document compiles.

Any idea how to use a deeptextcommand and firstcharacter as shown in the
attachment while also using the firstcharacter macro?

Thank you.

Kindest regards.

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Re: deeptextcommand and firstcharacter

[Hans Hagen]

On 9/21/2013 7:50 AM, Thangalin wrote:
> Hi,
>
> The attached file does not compile in ConTeXt.
>
> However, if the \placeindex is substituted for \completeindex, then the
> document compiles.
>
> Any idea how to use a deeptextcommand and firstcharacter as shown in the
> attachment while also using the firstcharacter macro?

this way of applying something to a first character won't work (as it 
assume real simple arguments)

so, the next beta has: \applytofirstcharacter

\defineframed[ChapterFramed][location=low,background=color,backgroundcolor=red,frame=off]

\setuphead[chapter][deeptextcommand=\applytofirstcharacter\ChapterFramed]

probaly a better interface is possible but it's seldom used so ... upto 
you to wikify this!

Hans

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                                           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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___________________________________________________________________________________

Re: deeptextcommand and firstcharacter

[Thangalin]

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Hi,

Most programming languages allow extraction of a character or substring
from a string. For example, if I wanted to stylize the word Index:

*I...* Index *...X*

It would be handy to do something like:

    \bold{\getcharacter[1]{#!}}... #1
...\bold{\getcharacter[\stringlength{#!}]}

That is a much more flexible solution than only providing a mechanism to
get the first character.

Is this possible?

Kind regards.

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Re: deeptextcommand and firstcharacter

[Thangalin]

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Sorry, I missed a {#1}:

    \bold{\getcharacter[1]{#1}}... #1 ...\bold{\getcharacter[\
stringlength{#1}{#1}]}

Best regards.

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Re: deeptextcommand and firstcharacter

[Wolfgang Schuster]

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Am 21.09.2013 um 19:11 schrieb Thangalin <thangalin@gmail.com>:

> Hi,
> 
> Most programming languages allow extraction of a character or substring from a string. For example, if I wanted to stylize the word Index:
> 
> I... Index ...X
> 
> It would be handy to do something like:
> 
>     \bold{\getcharacter[1]{#!}}... #1 ...\bold{\getcharacter[\stringlength{#!}]}
> 
> That is a much more flexible solution than only providing a mechanism to get the first character.
> 
> Is this possible?


You can use Lua!

\starttext
\cldcontext{string.sub("A short example text!",0,1)}
\cldcontext{string.sub("A short example text!",3,7)}
\cldcontext{string.sub("A short example text!",-5)}
\stoptext

Wolfgang

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Re: deeptextcommand and firstcharacter

[Thangalin]

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Hi, Wolfgang.

I tried dropping in the Lua code, but it does not extract the text:

\define[1]\StyleChapter{%
  \StyleChapterFramed{%
    \framed[align=right, frame=off]{%
      \startoverlay
        \color[ColourSecondaryLightest]{%
          \cldcontext{string.sub(#1,0,1)}
        }
        \vskip-1.9em\hskip1.2em#1
      \stopoverlay
    }
  }
}


! LuaTeX error [string "\directlua "]:1: bad argument #1 to 'sub' (string
expected, got nil)

I've tried a few variations:

          \directlua{string.sub(tex.sprint("\luatexluaescapestring{#1}") }
          \directlua{string.sub("\luatexluaescapestring{#1}",0,1)}
          \directlua{string.sub(tex.sprint("#1"),0,1)}
          \cldcontext{string.sub(tex.sprint("#1"),0,1)}

Any ideas?

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___________________________________________________________________________________

Re: deeptextcommand and firstcharacter

[Thangalin]

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Ah, I think this does it:

          \cldcontext{string.sub("#1",0,1)}%

Automatically expands the macro. Nice.

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___________________________________________________________________________________

Re: deeptextcommand and firstcharacter

[Wolfgang Schuster]

Am 21.09.2013 um 20:46 schrieb Thangalin <thangalin@gmail.com>:

> Hi, Wolfgang.
> 
> I tried dropping in the Lua code, but it does not extract the text:
> 
> \define[1]\StyleChapter{%
>   \StyleChapterFramed{%
>     \framed[align=right, frame=off]{%
>       \startoverlay
>         \color[ColourSecondaryLightest]{%
>           \cldcontext{string.sub(#1,0,1)}

\cldcontext{string.sub("#1",0,1)}%

>         }
>         \vskip-1.9em\hskip1.2em#1
>       \stopoverlay
>     }
>   }
> }

When this doesn’t help you have to provide a complete minimal example.

> ! LuaTeX error [string "\directlua "]:1: bad argument #1 to 'sub' (string expected, got nil)
> 
> I've tried a few variations:
> 
>           \directlua{string.sub(tex.sprint("\luatexluaescapestring{#1}") }
>           \directlua{string.sub("\luatexluaescapestring{#1}",0,1)}
>           \directlua{string.sub(tex.sprint("#1"),0,1)}
>           \cldcontext{string.sub(tex.sprint("#1"),0,1)}

1. You have to use string.sub in the parameters of tex.sprint.

2. ConTeXt uses \luaescapestring.

3. We use in ConTeXt \ctxlua instead of \directlua.

Wolfgang
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___________________________________________________________________________________

Re: deeptextcommand and firstcharacter

[Hans Hagen]

On 9/21/2013 7:11 PM, Thangalin wrote:
> Hi,
>
> Most programming languages allow extraction of a character or substring
> from a string. For example, if I wanted to stylize the word Index:
>
> *I...* Index *...X*
>
> It would be handy to do something like:
>
>      \bold{\getcharacter[1]{#!}}... #1
> ...\bold{\getcharacter[\stringlength{#!}]}

tex is macro language so that would not work .. of course I can provide 
something more clever than the previous hack but not this week (it's not 
too complex but i need to fool the font system and of course one might 
wonder if such features make any typographical sense at all esp in 
automated document processing)

> That is a much more flexible solution than only providing a mechanism to
> get the first character.

in this case #1 == \headtext{#1} so you cannot easily do such things 
without know what you deal with

-----------------------------------------------------------------
                                           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
___________________________________________________________________________________