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The Emacs package ANTLR-Mode provides: syntax highlighting for ANTLR grammar
files, automatic indentation, menus containing rule/token definitions and
supported options and various other things like running ANTLR from within
Emacs.
...The file "lex.yy.c" can be compiled and linked to produce an executable. When the executable is run, it analyzes its input for occurrences of text matching the regular expressions for each rule. Whenever it finds a match, it executes the corresponding C code.
Both forward-chaining and backward-chaining rules (which may include python code) are compiled into python. Can also automatically assemble python programs out of python functions which are attached to backward-chaining rules. See pyke.sourceforge.ne
The Language Machine is a toolkit for language and grammar: a library, main program, and self-hosted rule compilers with one frontend. The system is easy to use. It directly implements unrestricted rule-based grammars with actions and external interfaces.
JEOPS is a Java based forward chaining RULE ENGINE.
This Rule Engine is used to power up the business process by rules in Java Application Servers, client applications, and Servlets.