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The new code is much more readable and easier to extend. I took
inspiration from Haskell's Parsec project which seems to only
write the happy-path and applied the idea to Erlang's exceptions.
When the parser tries to parse, say, a list, and crashes, it
tries with a table next, and so on until something matches.
Normal paragraphs always match so there can be no parsing
failures.
The parser now has a number of passes: first the block parser,
then lists and tables passes to build a proper tree out of
them and finally an inline pass to apply inline formatting.
The resulting AST can then be modified at will and passed on
to translator modules which output a different format.
The man page translator was also rewritten and has been tested
against both Cowboy and Gun. Numerous issues were fixed as a
result of this rewrite.
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