The XEVM is an XML processing engine. It's a multi-threaded, Pub/Sub environment for dynamic programming on an event-driven state machine with TCP communications, tight fault free memory management, powerful set algebra, and a magical database. It is 100% C++ (25,000 LOC), with a thin porting layer; there are implementations for POSIX (Mac/Linux) and Win32. The XEVM is for processing XEPL (the Xepl Engine Programming Language).
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grammar::me_intro(3tcl) Grammar operations and usage grammar::me_intro(3tcl)__________________________________________________________________________________________________________________________________________________NAME
grammar::me_intro - Introduction to virtual machines for parsing token streams
DESCRIPTION
This document is an introduction to and overview of the basic facilities for the parsing and/or matching of token streams. One possibility
often used for the token domain are characters.
The packages themselves all provide variants of one virtual machine, called a match engine (short ME), which has all the facilities needed
for the matching and parsing of a stream, and which are either controlled directly, or are customized with a match program. The virtual
machine is basically a pushdown automaton, with additional elements for backtracking and/or handling of semantic data and construction of
abstract syntax trees (AST).
Because of the high degree of similarity in the actual implementations of the aforementioned virtual machine and the data structures they
receive and generate these common parts are specified in a separate document which will be referenced by the documentation for packages
actually implementing it.
The relevant documents are:
grammar::me_vm
Virtual machine specification.
grammar::me_ast
Specification of various representations used for abstract syntax trees.
grammar::me::util
Utility commands.
grammar::me::tcl
Singleton ME virtual machine implementation tied to Tcl for control flow and stacks. Hardwired for pull operation. Uninteruptible
during processing.
grammar::me::cpu
Object-based ME virtual machine implementation with explicit control flow, and stacks, using bytecodes. Suspend/Resumable. Push/pull
operation.
grammar::me::cpu::core
Core functionality for state manipulation and stepping used in the bytecode based implementation of ME virtual machines.
BUGS, IDEAS, FEEDBACK
This document, and the package it describes, will undoubtedly contain bugs and other problems. Please report such in the category gram-
mar_me of the Tcllib SF Trackers [http://sourceforge.net/tracker/?group_id=12883]. Please also report any ideas for enhancements you may
have for either package and/or documentation.
KEYWORDS
CFG, CFL, LL(k), PEG, TPDL, context-free grammar, context-free languages, expression, grammar, matching, parsing, parsing expression gram-
mar, push down automaton, recursive descent, top-down parsing languages, transducer, virtual machine
CATEGORY
Grammars and finite automata
COPYRIGHT
Copyright (c) 2005 Andreas Kupries <andreas_kupries@users.sourceforge.net>
grammar_me 0.1 grammar::me_intro(3tcl)