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-Guide to GF Implementation Code
-Aarne Ranta
-
-
-
-This document describes the code in GF grammar compiler and interactive
-environment. It is aimed to cover well the implementation of the forthcoming
-GF3. In comparison to GF 2.8, this implementation uses
-- the same source language, GF (only slightly modified)
-- a different run-time target language, GFCC (instead of GFCM)
-- a different separate compilation target language (a fragment GF itself, 
-  instead of GFC)
-- a different internal representation of source code
-
-
-Apart from GFCC, the goal of GF3 is simplification and consolidation, rather
-than innovation. This is shown in particular in the abolition of GFC, and in
-the streamlined internal source code format. The insight needed to achieve
-these simplifications would not have been possible (at least for us) without
-years of experimenting with the more messy formats; those formats moreover
-grew organically when features were added to the GF language, and the old
-implementation was thus a result of evolution rather than careful planning.
-
-GF3 is planned to be released in an Alpha version in the end of 2007, its
-sources forming a part of GF release 2.9.
-
-There are currently two versions of GF3, as regards executables and ``make`` 
-items:
-- ``gf3``, using the old internal representation of source language, and
-  integrating a compiler from GF to GFCC and an interpreter of GFCC
-- ``testgf3``, using the new formats everywhere but implementing the compiler
-  only; this program does not yet yield reasonable output
-
-
-The descriptions below will target the newest ideas, that is, ``textgf3`` 
-whenever it differs from ``gf3``.
-
-
-==The structure of the code==
-
-Code that is not shared with GF 2.8 is located in subdirectories of 
-``GF/Devel/``. Those subdirectories will, however, be moved one level
-up. Currently they include
-- ``GF/Devel/Grammar``: the datatypes and basic operations of source code
-- ``GF/Devel/Compile``: the phases of compiling GF to GFCC
-
-
-The other directories involved are
-- ``GF/GFCC``: data types and functionalities of GFCC
-- ``GF/Infra``: infrastructure utilities for the implementation
-- ``GF/Data``: datastructures belonging to infrastructure
-
-
-==The source code implementation==
-
-==The compiler==
-
-==The GFCC interpreter==
-
-==The GF command interpreter==
-
-
-
-
-
-