problems with the docs

problems with the docs

[maledetto]

hello

i'm trying to learn about scheme/guile-2.0 and the language module. but
the given compilers use some constructs i don't understand and can't
find explanation to. for example, i can't find explanation to pmatch or
emit. these procedures are also not listed in the procedure index.

regards,
maledetto <maledetto@online.de>

Re: problems with the docs

[Andy Wingo]

Hi,

On Mon 11 Oct 2010 00:40, maledetto@online.de writes:

> i'm trying to learn about scheme/guile-2.0 and the language module. but
> the given compilers use some constructs i don't understand and can't
> find explanation to. for example, i can't find explanation to pmatch or
> emit. these procedures are also not listed in the procedure index.

The manual aims to explain the interfaces that Guile offers to the
programmer. It would be much longer if it explained everything about
the implementation itself :) So many things you will find, you will have
to puzzle out yourself, or otherwise ask.

In this case, pmatch is a pattern matcher. Instead of writing:

(lambda (x)
  (if (and (pair? x) (eq? (car x) 'foo))
      (let ((bar (cdr x)))
        (* 2 bar))))

you can write

(lambda (x)
  (pmatch x
    ((foo . ,bar)
     (* 2 bar))))

`Emit' is a local variable in the compiler.

Have fun with Guile,

Andy
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