Properties of Block values are marshalled lazily, which generally
improves performance considerably. Script users may also notice the
following differences:
- Block element properties can no longer be accessed by numerical
indexing of the `.c` field. The `.c` property now serves as an alias
for `.content`, so some filter that used this undocumented method
for property access may continue to work, while others will need to
be updated and use proper property names.
- The marshalled Block elements now have a `show` method, and a
`__tostring` metamethod. Both return the Haskell string
representation of the element.
- Block values now have the Lua type `userdata` instead of `table`.
- Adds a new `pandoc.AttributeList()` constructor, which creates the
associative attribute list that is used as the third component of
`Attr` values. Values of this type can often be passed to constructors
instead of `Attr` values.
- `AttributeList` values can no longer be indexed numerically.
The new HsLua version takes a somewhat different approach to marshalling
and unmarshalling, relying less on typeclasses and more on specialized
types. This allows for better performance and improved error messages.
Furthermore, new abstractions allow to document the code and exposed
functions.
A new type `SimpleTable` is made available to Lua filters. It is
similar to the `Table` type in pandoc versions before 2.10;
conversion functions from and to the new Table type are provided.
Old filters using tables now require minimal changes and can use,
e.g.,
if PANDOC_VERSION > {2,10,1} then
pandoc.Table = pandoc.SimpleTable
end
and
function Table (tbl)
tbl = pandoc.utils.to_simple_table(tbl)
…
return pandoc.utils.from_simple_table(tbl)
end
to work with the current pandoc version.
The PandocError type is used throughout the Lua subsystem, all Lua
functions throw an exception of this type if an error occurs. The
`LuaException` type is removed and no longer exported from
`Text.Pandoc.Lua`. In its place, a new constructor `PandocLuaError` is
added to PandocError.
The functions `table.insert`, `table.remove`, and `table.sort` are added
to pandoc.List elements. They can be used as methods, e.g.
local numbers = pandoc.List {2, 3, 1}
numbers:sort() -- numbers is now {1, 2, 3}
Attr values can now be given as normal Lua tables; this can be used as a
convenient alternative to define Attr values, instead of constructing
values with `pandoc.Attr`. Identifiers are taken from the *id* field,
classes must be given as space separated words in the *class* field. All
remaining fields are included as misc attributes.
With this change, the following lines now create equal elements:
pandoc.Span('test', {id = 'test', class = 'a b', check = 1})
pandoc.Span('test', pandoc.Attr('test', {'a','b'}, {check = 1}))
This also works when using the *attr* setter:
local span = pandoc.Span 'text'
span.attr = {id = 'test', class = 'a b', check = 1}
Furthermore, the *attributes* field of AST elements can now be a plain
key-value table even when using the `attributes` accessor:
local span = pandoc.Span 'test'
span.attributes = {check = 1} -- works as expected now
Closes: #5744
Text.Pandoc.Shared:
+ Remove `Element` type [API change]
+ Remove `makeHierarchicalize` [API change]
+ Add `makeSections` [API change]
+ Export `deLink` [API change]
Now that we have Divs, we can use them to represent the structure
of sections, and we don't need a special Element type.
`makeSections` reorganizes a block list, adding Divs with
class `section` around sections, and adding numbering
if needed.
This change also fixes some longstanding issues recognizing
section structure when the document contains Divs.
Closes#3057, see also #997.
All writers have been changed to use `makeSections`.
Note that in the process we have reverted the change
c1d058aeb1
made in response to #5168, which I'm not completely
sure was a good idea.
Lua modules have also been adjusted accordingly.
Existing lua filters that use `hierarchicalize` will
need to be rewritten to use `make_sections`.
Traversal methods are updated to use the new Walk module such that
sequences with nested Inline (or Block) elements are traversed in the
order in which they appear in the linearized document.
Fixes: #5667
Version specifiers like `PANDOC_VERSION` and `PANDOC_API_VERSION` are
turned into `Version` objects. The objects simplify version-appropriate
comparisons while maintaining backward-compatibility.
A function `pandoc.types.Version` is added as part of the newly
introduced module `pandoc.types`, allowing users to create version
objects in scripts.
This makes use of tasty-lua, a package to write tests in Lua
and integrate the results into Tasty output. Test output becomes
more informative: individual tests and test groups become visible
in test output. Failures are reported with helpful error messages.
