On 01/04/20, 01:20, Gerben Wierda wrote:
> I have a string with double quotes that needs to become a text in a box in
> METAPOST. METAPOST is used to create an image consisting of boxes and
> connections.
>
> Basically, the approach is now something like this:
>
> TeX: calls Lua code with \ctxlua{filename}
> Lua: context.startMPpage
> Lua: read XML. String in XML in filename read by Lua
> Here we know the dimensions in which the string must be typeset and wrapped
> around because that is also in the XML
> Lua: A context() call contains METAPOST code that calls a METAPOST vardef
> (‘draw box’) with the string as argument
> METAPOST: Draws box and call TeX to typeset string using textext(), returns
> picture object
> TeX: Typeset string
>
> In short:
> TeX, calls
> Lua, reads XML and executes context( MP code) that gets executed on
> stopMPpage
> MP code calls TeX which typesets the string
>
> But, if the string contains double quotes (”) this will fail in METAPOST
> because the double quotes in the string will be printed in METAPOST code that
> is created by Lua and thus mess up METAPOST.
>
> So, what can I do?
To get a double quote in a MetaPost string like this
"embedded " double quote"
^
|___ oeps
use the ditto variable which expands to a string containing the double
quote character like so
"embedded " & ditto & " double quote"
Cheers, Henri
>
> G
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