We're now set up to handle user string substitutions `\*(xy` better.
The present approach has some inefficient list concatenation,
but we can fix that later.
We also introduce a new type ManTokens (a sequence of tokens)
and remove MComment. This allows lexers to return empty strings
of tokens, or multiple tokens (as when macros are resolved).
One test still fails. This needs to be fixed by moving handling
of .BI, .I, etc. to the parsing phase.
- Improved support for custom macro definitions.
- LinePart type has been added. RoffStr is now one
constructor of LinePart (the other being MacroArg).
- MComment has lost its argument.
- MEndMacro has been removed.
- MStr has been removed (we now simply use LinePart).
- Macros now store a list of tokens.
- Each macro argument is a [LinePart], instead of a LinePart.
- .BR now behaves as documented in man (and doesn't create a link).
This makes it possible to iterate over all field names of an AST element
by using a generic `for` loop with `pairs`:
for field_name, field_content in pairs(element) do
…
end
Raw table fields of AST elements should be considered an implementation
detail and might change in the future. Accessing element properties
should always happen through the fields listed in the Lua filter docs.
Note that the iterator currently excludes the `t`/`tag` field.
This allows raw openxml blocks and inlines to be used in the pptx
writer.
A few caveats:
1. It's up to the user to write well-formed openxml. The chances for
corruption, especially with such a brittle format as pptx, is pretty
high.
2. Because of the tricky way that blocks map onto shapes, if you are
using a raw block, it should be the only block on a slide (otherwise
other text might end up overlapping it).
3. The pptx ooxml namespace abbreviations are different from the docx ooxml
namespaces. Again, it's up to the user to get it right. Unzipped
document and ooxml specification should be consulted.
Closes: #4976
This should just add to metadata (title, date, section),
and not produce a level-1 header. (That might be done
in the template, depending on the output format.)
