Btukfyl

I want to be able to modify the style of some parts of a complex picture depending on a tag on nodes or pathes (precisely, I have a complex architecture schematic and I want to selectively highlight some datapathes). And I to facilitate maintenance of the picture, I prefer a single source.

One way to do that is:

1. to declare the tags as empty pgfkeys styles


2. and to modify their value on demand.

documentclass{article}

usepackage{tikz}

begin{document}

    pgfkeys{/tikz/.cd,<slide 1>/.style={}}

    pgfkeys{/tikz/.cd,<slide 2>/.style={}}

    pgfkeys{/tikz/.cd,<slide 3>/.style={}}

    pgfkeys{/tikz/.cd,<slide 4>/.style={}}



    newcommand{complexpicture}{



  node[draw, <slide 1>] at (0,0) {box 1};  

  node[draw, <slide 2>] at (2,0) {box 2};

  node[draw, <slide 3>] at (4,0) {box 3};

  node[draw, <slide 4>] at (6,0) {box 4};

}



General overview (all tags are ignored)

begin{tikzpicture}

  complexpicture

end{tikzpicture}



Highlight first item    

begin{tikzpicture}[<slide 1>/.style={very thick}]

  complexpicture

end{tikzpicture}



Highlight second item

begin{tikzpicture}[<slide 2>/.style={very thick}]

  complexpicture

end{tikzpicture}

end{document}

Of course, it works, but the need to previously declare tags is unflexible and inelegant.

So I tried to filter out < tags > with pgfkeys, except when a style exists. I used first char syntax to detect an initial <.

I did not succeed to declare styles starting with a <. So tikzpicture styles are in /tag/name/.style and I filter out < name > pgfkey, unless /tag/name exist.

documentclass{article}



usepackage{tikz}



begin{document}

newcommand{complexpicture}{

  node[draw, <slide 1>] at (0,0) {box 1};  

  node[draw, <slide 2>] at (2,0) {box 2};

  node[draw, <slide 3>] at (4,0) {box 3};

  node[draw, <slide 4>] at (6,0) {box 4};

}



pgfkeys{

  /handlers/first char syntax=true,

  /handlers/first char syntax/the character </.initial=mykeymacro

}

defmykeymacro#1{mykeyparser#1someendtext}

defmykeyparser<#1>someendtext{

  pgfkeysifdefined{/tag/#1}{pgfkeysvalueof{/tag/#1}}{}

}



General overview (all tags are ignored)\

begin{tikzpicture}

  complexpicture

end{tikzpicture}



Highlight first item\

begin{tikzpicture}[/tag/slide 1/.style={very thick}]

  complexpicture

end{tikzpicture}



Highlight second item\

begin{tikzpicture}[/tag/slide 2/.style={very thick}]

  complexpicture

end{tikzpicture}





end{document}

Actually, it does not work. < tags > are properly filtered out and there is no pgfkeys error, but all theses keys are suppressed and the styles declared in the tikzpicture are never activated. I tried some variations on this scheme, but none did work.

Probably I am missing something...