YellowGrass

missing parse errors on non-alphanumeric characters

I have the following pretty minimal SDF grammar

module Spoobar

exports

	context-free start-symbols
		Start
		
	context-free syntax
		
		EFGH -> Start {cons("FooBar")}
			
	lexical syntax 
	
		-> EOF

		" "* "\n" -> EFG
		
		EFG+ -> EFGH
		EFG* " "+ EOF -> EFGH
		
	lexical restrictions
		
		EOF 	-/- ~[]

and an example file with some spaces and line breaks in it. Inserting an a gives a parse error on a. However, when I change a into * or another non-alphanumeric character, the error vanishes.

Submitted by Guido Wachsmuth on 28 January 2012 at 02:00

Issue Log

On 28 January 2012 at 02:04 Guido Wachsmuth tagged parser
On 2 February 2012 at 16:24 Lennart Kats commented:

Does the same happen when you start with a clean file and enter ‘*’? Would it be a problem in the parser or the syntax error marking?

On 8 January 2013 at 14:42 Eelco Visser tagged sdf

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