jlp/doc/jlp-notes

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Implement special-purpose Markdown processor. This way it can be intelligent
about connecting seperated doc-blocks that should be a unit, can process thing
like link references on a whole-document basis, and can be more intelligent
about indentation, line numbers for doc blocks.
Consider building up common, generic AST nodes for code parsers so that most of
the work of integrating a new language is already done in the common code,
leaving only the very specific behavior to be implemented. For starters:
CodeUnit
: Supports things like classes in OOP, modules, even files if that is a
common organizational unit for the language.
Callable
: Supports methods, functions, subroutines, closures, anything that takes
parameters and returns a value.
Structure
: May be a useful abstraction for pure data objects (Erlang record
definitions, C/C++ unions and structs, enums, etc.).
Make Directives completely configurable. Do not hard-code an enumeration of
possible values. Make the actual directive text just another field on the class.
This allows language-specific implementations to extend the built-in Directives
easily. It also has the benefit of allowing unknown or invalid directives
through the parser without causing the source file to fail to parse. This gives
us a better way to warn the user of unknown directives. To this end it may be
good to assemble a list of defined directives at runtime, but this would not
happen in the parser itself.
Add back the @doc directive to return to private implementation notes within a
block that has so far been marked public with an @api directive.