Element attributes are pushed to the stack via the `Attributes`
function. `Attributes` creates an Attr like triple, but the triple also
allows table-like access to key-value pairs.
Provide functions `pandoc.SingleQuoted`, `pandoc.DoubleQuoted`,
`pandoc.DisplayMath`, and `pandoc.InlineMath` to allow simple building
of Math and Quoted elements.
Lua string are used to represent nullary data constructors. The previous
table-based representation was based on the JSON serialization, but can
be simplified. This also matches the way those arguments are passed to
custom writers.
The lua filters and custom lua writer system defined very similar
StackValue instances for strings and tuples. These instance definitions
are extracted to a separate module to enable sharing.
Native lua booleans and strings are used to represent MetaBool and
MetaString values. This is more natural than the previous table-based
representation. The old lua representation can still be read back to
haskell, ensuring compatibility with the `pandoc.MetaBool` and
`pandoc.MetaString` lua constructors.
Filtering functions take element components as arguments instead of the
whole block elements. This resembles the way elements are handled in
custom writers.
Instead of taking only a single argument containing the pre-packed
element contents, `Inline` constructors now take the same arguments as
the respective filter and `Custom` writer function
Instead of taking the whole inline element, forcing users to destructure it
themselves, the components of the elements are passed to the filtering
functions.
The docx writer takes components from the distribution's
version of reference.docx when it can't find them in a
user's custom reference.docx. (This sometimes happens
because Word will sometimes omit components needed for larger
documents when saving a simple one.)
Previously, we allowed a reference.docx in the data directory
(e.g. `~/.pandoc`) to be used as the distribution's reference.docx.
This led to a bizarre situation where pandoc would produce a
good docx using `--template ~/.pandoc/ref.docx`, but if `ref.docx`
were moved to `~/.pandoc/reference.docx`, it would then produce
a corrupted docx.
Closes#3322 (I think).
Reading of simple block values from the lua stack is handled manually,
but most block constructors are still handled via instances of aeson's
Value type.
Getting inline instances from the lua stack is handled manually for some
simple inline constructors, including the `Str` constructor. This avoids
the indirect route through aeson's Value type and improves performance
considerably (approx. 30% speedup for some filters).
Albert Krewinkel