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parsing.mdwn

Purpose

Design the file parser architecture from the bottom up.

Plan

Assume I have an event-driven sequential access YAML parser, like the SAX parser for XML.

On top of that, I implement a wrapper specific for my language here, which works in the same way: sequential access and callbacks.

On top of that, I implement a parser which reads a file into an in-memory structure, like a DOM parser for XML. It is implemented using the SAX-like parser, with callbacks that I write which gradually fill the structure and build a graph.

One of the above two is also then used as a basis for a parser which reads a file and writes into a semantic database.

The SAX-like process can be implemented in three levels:

A class template, where callbacks are template parameters (can be lambdas, functors, function pointers, etc.)
Callbacks are std::function (like slots in gtkmm/sigc++), can be an instantiation of the above template
OOP wrapper where callbacks are virtual functions, like the SAX parser in libxml++

Summary

SAX-like parser for YAML
SAX-like parser for Idan
	Template with callbacks as parameters
	Callbacks are std::function slots
	OOP wrapper with callbacks as virtual functions
DOM-like parser which reads into in-memory model
Parser which reads file definitions into semantic database