CODEWITHSUNDEEP
latex
Matt McMinn
Matt McMinn

Reputation: 16291

Replace a character with a string in LaTeX

I'm looking for a way to do a substring replace on a string in LaTeX. What I'd like to do is build a command that I can call like this:

\replace{File,New}

and that would generate something like

\textbf{File}$\rightarrow$\textbf{New}

This is a simple example, but I'd like to be able to put formatting/structure in a single command rather than everywhere in the document. I know that I could build several commands that take increasing numbers of parameters, but I'm hoping that there is an easier way.

Edit for clarification

I'm looking for an equivalent of 

string.replace(",", "$\rightarrow$)

something that can take an arbitrary string, and replace a substring with another substring.

So I could call the command with \replace{File}, \replace{File,New}, \replace{File,Options,User}, etc., wrap the words with bold formatting, and replace any commas with the right arrow command. Even if the "wrapping with bold" bit is too difficult (as I think it might be), just the replace part would be helpful.

Upvotes: 10

Views: 23974

Answers (5)

Paul Biggar
Paul Biggar

Reputation: 28739

Try the xstring package:

\usepackage{xstring}

[…]

\StrSubstitute{File,New}{,}{\(\rightarrow\)}

Upvotes: 3

Becheru Petru-Ioan
Becheru Petru-Ioan

Reputation: 321

it looks like your "spaces" problem is from a bug in that package. If you surround the "\GetTokens" macro with, say, commas, then you'll see that the extra space is inserted by that macro.

Yes there are bugs in tokenizer package. As I said on my blog, the bugfix is to use the following correcting code instead of just "\usepackage[trim]{tokenizer}":

\usepackage[trim]{tokenizer}  

\def\SH@GetTokens#1,#2\@empty{%
    \def\SH@token{#1}%
    \ifx\SH@trimtokens\SH@true% strip spaces if requested
        \TrimSpaces\SH@token%
    \fi%
    \SH@DefineCommand{\SH@FirstArgName}{\SH@token}%
    \SH@DefineCommand{\SH@SecondArgName}{#2}%
    }
\def\SH@CheckTokenSep#1,#2\@empty{%
    \def\SH@CTSArgTwo{#2}%
    \ifx\SH@CTSArgTwo\@empty%
        \edef\SH@TokenValid{\SH@false}%
    \else%
        \edef\SH@TokenValid{\SH@true}%
    \fi%
    }

I will report this bugfix to the developer Sascha Herpers

Upvotes: 4

Brent.Longborough
Brent.Longborough

Reputation: 9775

There's a LaTeX package called tokenizer which may help you to do what you want.

Here's a hack (but pure LaTeX, no internals) which gets close to what I think you want, but with some extraneous spaces I haven't quite been able to fix. Perhaps Will Robertson can advise further? Unlike his slightly more polished answer, I haven't parameterised the bits and pieces, Here goes:

\usepackage{forloop}  
\usepackage[trim]{tokenizer}  
...  
\newcounter{rrCount}  
\newcommand{\replace}[1]{%  
    \GetTokens{rrFirst}{rrRest}{#1,}%  
    \textbf{\rrFirst}%  
    \forloop{rrCount}{0}{\value{rrCount} < 100}{%  
        \ifthenelse{\equal{\rrRest}{}}{%  
            \setcounter{rrCount}{101}%  
        }{%  
            \GetTokens{rrFirst}{rrRest}{\rrRest}%  
            $\rightarrow$\textbf{\rrFirst}%  
        }%  
    }%  
}%  
% -----------------------------------------------------------------  
\replace{a1}\\  
\replace{a2,b2}\\  
\replace{a3,b3,c3}\\

Upvotes: 2

Will Robertson
Will Robertson

Reputation: 64510

The general case is rather more tricky (when you're not using commas as separators), but the example you gave can be coded without too much trouble with some knowledge of the LaTeX internals.

\documentclass[12pt]{article}
\makeatletter
\newcommand\formatnice[1]{%
  \let\@formatsep\@formatsepinit
  \@for\@ii:=#1\do{%
    \@formatsep
    \formatentry{\@ii}%
  }%
}
\def\@formatsepinit{\let\@formatsep\formatsep}
\makeatother
\newcommand\formatsep{,}
\newcommand\formatentry[1]{#1}
\begin{document}
\formatnice{abc,def}

\renewcommand\formatsep{\,$\rightarrow$\,}
\renewcommand\formatentry[1]{\textbf{#1}}
\formatnice{abc,def}
\end{document}

Upvotes: 6

Brent.Longborough
Brent.Longborough

Reputation: 9775

OK, I withdraw this answer. Thanks for clarifying the question.

I suspect this may not be what you want, but here goes anyway:

\newcommand{\replace}[2]{\textbf{#1}$\rightarrow$\textbf{#2}}  
\replace{File}{New}

If this isn't what you're looking for, could you clarify the question, please?

Upvotes: -1

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