[mercury-users] using mercury for parsing/scanning

Dave Slutzkin dave_slutzkin at yahoo.com
Mon Dec 31 14:41:05 AEDT 2001

 --- Fergus Henderson <fjh at cs.mu.OZ.AU> wrote:
> On 31-Dec-2001, Dave Slutzkin
> <dave_slutzkin at yahoo.com> wrote:
> > When using DCGs to scan character strings, is
there an
> > alternative to this:
> > 
> > keyword -->
> >    ['K','E','Y','W','O','R','D']
> You can use
> 	keyword --> string("KEYWORD").
> where string//1 can be defined as

<snipped code>

But surely this is inefficient?  Doing the conversino
every time the predicate is called?

Another question:

How do I write a char literal?  '@' works fine, but
'.' or ',' gives me problems (they look like operators
to the compiler).  "'.'" is a string not a char.  0'.
is an int not a char.  Is there such thing as a char
literal in mercury?


(dcs at students.cs.mu.oz.au)

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