I'm working now in the second article, which seems to prefer EBNF: to <EBNF and I think [EBNF.
... I think we need periods at the ends of the EBNF rules in the second article. ... Also, digit> cannot be found in the current vocab search path, even though math.parser is in the path. Shaping -----Original Message----- From: Shaping [mailto:[email protected]] Sent: 2010-November-09, 05:47 To: [email protected] Subject: [Factor-talk] PEGs I tried the first two yellow blocks in this article http://www.bluishcoder.co.nz/2007/11/embedded-grammars-in-factor.html The first block I put on a word, and it compiled. The next three evaluables didn't not work. For example "123" number parse raised an exception (U) Quotation: [ set-namestack init-catchstack self quot>> call -> stop ] (O) Word: listener-thread (O) Word: listener (O) Word: (listener) (U) Quotation: [ [ ~quotation~ dip swap ~quotation~ dip ] dip swap [ call datastack ] dip -> swap [ set-datastack ] dip ] (U) Quotation: [ call -> datastack ] (O) Method: M\ object parse (O) Word: no-method (O) Method: M\ object throw (U) Quotation: [ 63 special-object error-thread set-global continuation -> error-continuation set-global [ original-error set-global ] [ rethrow ] bi ] Why have you color-coded the "parse" words in the HTML? Shaping -----Original Message----- From: Chris Double [mailto:[email protected]] Sent: 2010-November-09, 02:57 To: [email protected] Subject: Re: [Factor-talk] Furnace, XStreams (PEGs) and some observations about Factor On Tue, Nov 9, 2010 at 9:38 PM, Shaping <[email protected]> wrote: > I need to be able to write a parser in a > straightforward way (XStreams-style maybe) using a PEG (collection of BNF > productions) so that I can experiment efficiently with this idea. Does > anyone have any experience with PEGs in Factor? Read the help for peg.ebnf. You can do this with the following in the listener: "peg.ebnf" about Also these blog posts: http://www.bluishcoder.co.nz/2007/11/embedded-grammars-in-factor.html http://www.bluishcoder.co.nz/2008/04/factor-parsing-dsl.html http://www.bluishcoder.co.nz/2008/06/parsing-javascript-with-factor.html The code in them is slightly out of date but combined with the peg.ebnf help you should be able to get the idea. There are a few peg.ebnf usage examples for a JavaScript grammar, a PL0 grammar and an expression calculator in the Factor source. My PDF of articles might have more up to date code examples than the blog posts: http://www.bluishcoder.co.nz/factor-articles.pdf Chris. -- http://www.bluishcoder.co.nz ---------------------------------------------------------------------------- -- The Next 800 Companies to Lead America's Growth: New Video Whitepaper David G. Thomson, author of the best-selling book "Blueprint to a Billion" shares his insights and actions to help propel your business during the next growth cycle. Listen Now! http://p.sf.net/sfu/SAP-dev2dev _______________________________________________ Factor-talk mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/factor-talk ---------------------------------------------------------------------------- -- The Next 800 Companies to Lead America's Growth: New Video Whitepaper David G. Thomson, author of the best-selling book "Blueprint to a Billion" shares his insights and actions to help propel your business during the next growth cycle. Listen Now! http://p.sf.net/sfu/SAP-dev2dev _______________________________________________ Factor-talk mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/factor-talk ------------------------------------------------------------------------------ The Next 800 Companies to Lead America's Growth: New Video Whitepaper David G. Thomson, author of the best-selling book "Blueprint to a Billion" shares his insights and actions to help propel your business during the next growth cycle. Listen Now! http://p.sf.net/sfu/SAP-dev2dev _______________________________________________ Factor-talk mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/factor-talk
