Support extention syntax in grammar
Opened this issue · 2 comments
GoogleCodeExporter commented
I have been ponering how to define quoted string in my Turtle grammar
definition. Currently I have this (which is not sufficient)...
quotedString ::= ("'"" {anychar} "'"")
anychar ::= (%alpha% | %digit% | " " | ":" | ".")
What I really need is a quoted string matcher like the one defined in the
info.reflectionsofmind.parser.Grammar class.
However, in order to be able to use a custom Matcher I would have to
abandon my grammar defintion file and instead define the Turtle grammar in
Java, using the info.reflectionsofmind.parser API.
However, if an extension syntax is added to the grammar definition then it
would be possible to create Matchers in Java and refer to them in the
grammer.
There is an example of EBNF extension syntax in this article...
http://en.wikipedia.org/wiki/Extended_Backus%E2%80%93Naur_form
Basically, in java-parser-ttols, the extension syntax would allow a
Matcher defined in Java to be assigned to a named matcher in the grammar
definitionwork. Here is an example...
quotedString= ?info.reflectionsofmind.parser.QuotedStringMatcher?
...where the contents between the question marks names a class that
implements a Matcher.
Original issue reported on code.google.com by emorning
on 14 Apr 2009 at 6:08
GoogleCodeExporter commented
NOTE: Intead of using ? to delimit extension I could just extend the current %
syntax to support class names.
Thus my example would become...
quotedString= %info.reflectionsofmind.parser.QuotedStringMatcher%
Original comment by emorning
on 14 Apr 2009 at 6:25
GoogleCodeExporter commented
Yes, I agree that this is a very nice feature to have.
Original comment by shooshpa...@gmail.com
on 19 Sep 2009 at 8:50