Subject: Incremental parsing using PEGs?
Date: Saturday 3rd February 2007 00:40:47 UTC (over 10 years ago)
Hi everybody, Has anyone tried incremental parsing algorithms (the only one I know about is Earley's) with PEGs? And has anyone defined a set of data structures and functions that make it easy to hook incremental parsers to editors? The PEG-based parser generators I've seen are interesting, but geared toward generating batch parsers. As you may be able to tell from my questions, I'm looking for an editor, or some tool to create one. Specifically I'm looking for an editor (or editor generator) that can work with programs in different languages. From that point of view, PEGs are a clear and powerful way to write language modules for the editor, but another abstraction (CFGs or something) might address my desires too. By "work with", I mean "highlight the complete syntax of", "allow the user to move through and edit the parse tree of", "pass the parse tree directly to a compiler", "mark errors returned by the compiler", and other interesting things like that. Correctness is important -- many popular editors cheat too much to qualify. Another quality I'm looking for is self-awareness or self-hosting. So the editor should work with files containing language modules, and the editor should also have built-in modules for the specialized languages it executes (macros, search patterns, system commands, etc.) and should use highlighting at prompts as well as in file buffers. Interrestingly, the editors I've found (Climacs and DrScheme/MrEd) are written in LISP dialects and work with LISP programs. LISP is amazingly easy to parse and manipulate. But I haven't gotten very far yet at expanding those editors, so I thought I'd ask for more ideas. Thanks! -- Derek