Lua filters: can I traverse paragraphs in reading order?

Lua filters: can I traverse paragraphs in reading order?

[jcr]

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In a text that I am preparing in Markdown I am tagging page numbers. I use 
Lua filters to transform the text for output, and one of the things I do in 
the filter is warn when there are page numbers out of order. When there are 
two page numbers in the same paragraph, I can get spurious warnings because 
the order in which the filter is invoked on the spans does not match the 
order in which the text is read. With the following text and filter, the 
warning "Warning: page 123 follows page 124" is printed. this seems to 
depend on the fact that the second page number is inside a quotation. If 
the quotation marks are removed, no warning is printed. Is there a way to 
make sure the filter visits spans in reading order?

Text:

[123]{.pnum} Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed 
do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad 
minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex 
ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate 
velit esse cillum dolore eu fugiat nulla pariatur. "Excepteur sint 
[124]{.pnum} occaecat cupidatat non proident, sunt in culpa qui officia 
deserunt mollit anim id est laborum."

Simplified filter:

local lastPage = nil

function Span(el)
  if el.classes[1] == "pnum" then
      local s = pandoc.utils.stringify(el)
      local page = string.match(s, "(%d+)")
      if page then
        page = tonumber(page)
        if lastPage and page <= lastPage then
          io.stderr:write(string.format("Warning: page %d follows page 
%d\n", page, lastPage))
        end
        lastPage = page
     end
  end  
  return el
end

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Re: Lua filters: can I traverse paragraphs in reading order?

[John MacFarlane]

I believe this is fixed by
https://github.com/jgm/pandoc/issues/5667
You could try with a nightly build...

jcr <ffi.appdev-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:

> In a text that I am preparing in Markdown I am tagging page numbers. I use 
> Lua filters to transform the text for output, and one of the things I do in 
> the filter is warn when there are page numbers out of order. When there are 
> two page numbers in the same paragraph, I can get spurious warnings because 
> the order in which the filter is invoked on the spans does not match the 
> order in which the text is read. With the following text and filter, the 
> warning "Warning: page 123 follows page 124" is printed. this seems to 
> depend on the fact that the second page number is inside a quotation. If 
> the quotation marks are removed, no warning is printed. Is there a way to 
> make sure the filter visits spans in reading order?
>
> Text:
>
> [123]{.pnum} Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed 
> do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad 
> minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex 
> ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate 
> velit esse cillum dolore eu fugiat nulla pariatur. "Excepteur sint 
> [124]{.pnum} occaecat cupidatat non proident, sunt in culpa qui officia 
> deserunt mollit anim id est laborum."
>
> Simplified filter:
>
> local lastPage = nil
>
> function Span(el)
>   if el.classes[1] == "pnum" then
>       local s = pandoc.utils.stringify(el)
>       local page = string.match(s, "(%d+)")
>       if page then
>         page = tonumber(page)
>         if lastPage and page <= lastPage then
>           io.stderr:write(string.format("Warning: page %d follows page 
> %d\n", page, lastPage))
>         end
>         lastPage = page
>      end
>   end  
>   return el
> end
>
> -- 
> You received this message because you are subscribed to the Google Groups "pandoc-discuss" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to pandoc-discuss+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
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Re: Lua filters: can I traverse paragraphs in reading order?

[jcr]

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Thank you. It works with the nightly build (pandoc-osx-b80bd174a). Since 
this is only an annoyance, I'll wait for the release.

On Tuesday, October 22, 2019 at 6:09:40 PM UTC+2, John MacFarlane wrote:
>
>
> I believe this is fixed by 
> https://github.com/jgm/pandoc/issues/5667 
> You could try with a nightly build... 
>
> jcr <ffi....-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org <javascript:>> writes: 
>
> > In a text that I am preparing in Markdown I am tagging page numbers. I 
> use 
> > Lua filters to transform the text for output, and one of the things I do 
> in 
> > the filter is warn when there are page numbers out of order. When there 
> are 
> > two page numbers in the same paragraph, I can get spurious warnings 
> because 
> > the order in which the filter is invoked on the spans does not match the 
> > order in which the text is read. With the following text and filter, the 
> > warning "Warning: page 123 follows page 124" is printed. this seems to 
> > depend on the fact that the second page number is inside a quotation. If 
> > the quotation marks are removed, no warning is printed. Is there a way 
> to 
> > make sure the filter visits spans in reading order? 
> > 
> > Text: 
> > 
> > [123]{.pnum} Lorem ipsum dolor sit amet, consectetur adipiscing elit, 
> sed 
> > do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim 
> ad 
> > minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip 
> ex 
> > ea commodo consequat. Duis aute irure dolor in reprehenderit in 
> voluptate 
> > velit esse cillum dolore eu fugiat nulla pariatur. "Excepteur sint 
> > [124]{.pnum} occaecat cupidatat non proident, sunt in culpa qui officia 
> > deserunt mollit anim id est laborum." 
> > 
> > Simplified filter: 
> > 
> > local lastPage = nil 
> > 
> > function Span(el) 
> >   if el.classes[1] == "pnum" then 
> >       local s = pandoc.utils.stringify(el) 
> >       local page = string.match(s, "(%d+)") 
> >       if page then 
> >         page = tonumber(page) 
> >         if lastPage and page <= lastPage then 
> >           io.stderr:write(string.format("Warning: page %d follows page 
> > %d\n", page, lastPage)) 
> >         end 
> >         lastPage = page 
> >      end 
> >   end   
> >   return el 
> > end 
> > 
> > -- 
> > You received this message because you are subscribed to the Google 
> Groups "pandoc-discuss" group. 
> > To unsubscribe from this group and stop receiving emails from it, send 
> an email to pandoc-...-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org <javascript:>. 
> > To view this discussion on the web visit 
> https://groups.google.com/d/msgid/pandoc-discuss/937d0cc8-12cf-40c4-83f8-f5c50c14e4b3%40googlegroups.com. 
>
>

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