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fb66a47a8e
* module/language/elisp/README: Document it and some further ideas written down. * module/language/elisp/compile-tree-il.scm: Implement prog1, dolist. * module/language/elisp/runtime/macro-slot.scm: prog2 and dotimes. * test-suite/tests/elisp-compiler.test: Test prog1, prog2, dotimes, dolist.
88 lines
2.9 KiB
Scheme
88 lines
2.9 KiB
Scheme
;;; Guile Emac Lisp
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;; Copyright (C) 2001 Free Software Foundation, Inc.
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;; This program is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;;
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;;
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;; You should have received a copy of the GNU General Public License
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;; along with this program; see the file COPYING. If not, write to
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;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Code:
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(define-module (language elisp runtime macro-slot)
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#:use-module (language elisp runtime))
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; This module contains the macro definitions of elisp symbols. In contrast to
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; the other runtime modules, those are used directly during compilation, of
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; course, so not really in runtime. But I think it fits well to the others
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; here.
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; The prog2 construct can be directly defined in terms of prog1 and progn,
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; so this is done using a macro.
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(built-in-macro prog2
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(lambda (form1 form2 . rest)
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`(progn ,form1 (prog1 ,form2 ,@rest))))
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; Define the conditionals when and unless as macros.
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(built-in-macro when
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(lambda (condition . thens)
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`(if ,condition (progn ,@thens) nil)))
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(built-in-macro unless
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(lambda (condition . elses)
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`(if ,condition nil (progn ,@elses))))
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; Define the dotimes iteration macro.
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; As the variable has to be bound locally for elisp, this needs to go through
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; the dynamic scoping fluid system. So we can't speed these forms up by
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; implementing them directly in the compiler with just a lexical variable
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; anyways.
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; For dolist, on the other hand, we have to bind the elisp variable to the
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; list elements but keep track of the list-tails in another one. Therefore,
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; this can take advantage of real compilation because of circumventing the
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; fluid-system for this variable.
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(built-in-macro dotimes
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(lambda (args . body)
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(if (or (not (list? args))
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(< (length args) 2)
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(> (length args) 3))
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(macro-error "invalid dotimes arguments" args)
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(let ((var (car args))
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(count (cadr args)))
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(if (not (symbol? var))
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(macro-error "expected symbol as dotimes variable"))
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`(let ((,var 0))
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(while (< ,var ,count)
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,@body
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(setq ,var (1+ ,var)))
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,@(if (= (length args) 3)
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(list (caddr args))
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'()))))))
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; Pop off the first element from a list or push one to it.
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(built-in-macro pop
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(lambda (list-name)
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`(prog1 (car ,list-name)
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(setq ,list-name (cdr ,list-name)))))
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(built-in-macro push
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(lambda (new-el list-name)
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`(setq ,list-name (cons ,new-el ,list-name))))
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