On 1 Apr 2020, at 01:53, Henri Menke <henrimenke@gmail.com> wrote:

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 (=E2=80=98draw box=E2=80=99) 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 (=E2=80=9D) 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"
          &nb= sp;  ^
          &nb= sp;  |___ oeps

use the ditto variable which expands to a string containing = the double
quote = character like so

   "embedded " & ditto & " double = quote=E2=80=9D

That is great! Thanks.

Cheers, Henri

G
_______________________________________________________________= ____________________
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
_______________________________________________________________= ____________________
_______________________________________________________________= ____________________
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
_______________________________________________________________= ____________________