ipg,alexk7

ipg's Introduction

IPG - The Incremental Parser Generator

--- Description ---

IPG is, like Yacc or Bison, a parser generator. However, it is not based on LALR
grammars but instead on Parsing Expression Grammars, or PEGs. This is a more
intuitive way to write grammars and generates parsers that are human readable.

It is also different because its aim is to provide good support for incremental
parsing. This is useful for applications like an IDE that always provides
features based on an up-to-date analysis of the program being written.

IPG consumes two input: one is the PEG grammar describing the language to
recognized. The other is a list of actions to execute when it is confirmed that
a given non-terminal is part of a complete phrase from the language. The two
input are separated, which leave a much cleaner grammar to read and edit.

--- Current Status ---

For now, IPG only generates a recognizing parser for a PEG given in the ASCII
syntax given at http://pdos.csail.mit.edu/~baford/packrat/popl04/peg-popl04.pdf.

Instead of a special syntax for semantic actions, IPG generates C++ iterators
classes to traverse the parse tree directly from the memoized structures. This
part is not yet functional.

--- Dependencies ---

IPG requires:
	-	Boost, version 1.46.1 or later

--- Directories ---

build: IDE projects to build IPG
	xcode
src
	cpp: C++ source files
	sh: Shell scripts
	man: Man page definitions
	peg: Parsing Expression Grammer (PEG) files
	tpl: Google CTemplate files

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