> On 1 Apr 2020, at 01:53, Henri Menke <henrime...@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
>> (‘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”
That is great! Thanks.
G
>
> Cheers, Henri
>
>>
>> G
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