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98 lines
2.5 KiB
Scheme
98 lines
2.5 KiB
Scheme
;;; Guile VM specific syntaxes and utilities
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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 (system base syntax)
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:use-module (oop goops)
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:use-module (ice-9 match)
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:use-module (ice-9 receive)
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:use-module (ice-9 and-let-star)
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:export (match syntax-error and-let* receive))
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;;;
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;;; Keywords by `:KEYWORD'
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;;;
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(read-set! keywords 'prefix)
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;;;
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;;; Dot expansion
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;;;
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;; FOO.BAR -> (slot FOO 'BAR)
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(define (expand-dot! x)
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(cond ((and (symbol? x) (not (eq? x '...))) (expand-symbol x))
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((pair? x)
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(cond ((memq (car x) '(quote quasiquote)) x)
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(else (set-car! x (expand-dot! (car x)))
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(set-cdr! x (expand-dot! (cdr x)))
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x)))
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(else x)))
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(define (expand-symbol x)
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(let loop ((s (symbol->string x)))
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(let ((i (string-rindex s #\.)))
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(if i
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`(slot ,(loop (substring s 0 i))
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(quote ,(string->symbol (substring s (1+ i)))))
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(string->symbol s)))))
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(define syntax expand-dot!)
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(export-syntax syntax)
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;; slot accessor
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(define slot (make-procedure-with-setter slot-ref slot-set!))
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(export slot)
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;;;
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;;; Simplified define-class
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;;;
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;; (define-vm-class <foo> () (x 1) (y 2)) =>
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;;
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;; (define-class <foo> ()
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;; (a :init-keyword :a :init-form 1)
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;; (b :init-keyword :b :init-form 2))
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(define-macro (define-vm-class name supers . rest)
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`(define-class ,name ,supers
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,@(map (lambda (def)
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(if (not (pair? def)) (set! def (list def)))
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(let ((name (car def)) (rest (cdr def)))
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(cons* name :init-keyword (symbol->keyword name)
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(if (or (null? rest) (keyword? (car rest)))
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rest
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(cons :init-form rest)))))
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rest)))
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(export-syntax define-vm-class)
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;;;
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;;; Other utilities
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;;;
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(define-public (list-fold f d l)
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(if (null? l)
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d
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(list-fold f (f (car l) d) (cdr l))))
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