[m-rev.] for review: speed up lexer.m

[Ralph Becket]

Zoltan Somogyi, Monday, 19 May 2008:
> On 16-May-2008, Zoltan Somogyi <zs at csse.unimelb.edu.au> wrote:
> > I am working on another change that speeds up the same piece of code,
> > by turning all those nested if-then-elses in get_token etc into switches.
> 
> Here it is, for review by anyone.

That looks very neat to me.
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