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Diffstat (limited to 'srfi/srfi-10.scm')
-rw-r--r-- | srfi/srfi-10.scm | 114 |
1 files changed, 0 insertions, 114 deletions
diff --git a/srfi/srfi-10.scm b/srfi/srfi-10.scm deleted file mode 100644 index 481732051..000000000 --- a/srfi/srfi-10.scm +++ /dev/null @@ -1,114 +0,0 @@ -;;; srfi-10.scm --- Hash-Comma Reader Extension - -;; Copyright (C) 2001, 2002 Free Software Foundation, Inc. -;; -;; This program is free software; you can redistribute it and/or -;; modify it under the terms of the GNU General Public License as -;; published by the Free Software Foundation; either version 2, or -;; (at your option) any later version. -;; -;; This program is distributed in the hope that it will be useful, -;; but WITHOUT ANY WARRANTY; without even the implied warranty of -;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU -;; General Public License for more details. -;; -;; You should have received a copy of the GNU General Public License -;; along with this software; see the file COPYING. If not, write to -;; the Free Software Foundation, Inc., 59 Temple Place, Suite 330, -;; Boston, MA 02111-1307 USA -;; -;; As a special exception, the Free Software Foundation gives permission -;; for additional uses of the text contained in its release of GUILE. -;; -;; The exception is that, if you link the GUILE library with other files -;; to produce an executable, this does not by itself cause the -;; resulting executable to be covered by the GNU General Public License. -;; Your use of that executable is in no way restricted on account of -;; linking the GUILE library code into it. -;; -;; This exception does not however invalidate any other reasons why -;; the executable file might be covered by the GNU General Public License. -;; -;; This exception applies only to the code released by the -;; Free Software Foundation under the name GUILE. If you copy -;; code from other Free Software Foundation releases into a copy of -;; GUILE, as the General Public License permits, the exception does -;; not apply to the code that you add in this way. To avoid misleading -;; anyone as to the status of such modified files, you must delete -;; this exception notice from them. -;; -;; If you write modifications of your own for GUILE, it is your choice -;; whether to permit this exception to apply to your modifications. -;; If you do not wish that, delete this exception notice. - -;;; Commentary: - -;; This module implements the syntax extension #,(), also called -;; hash-comma, which is defined in SRFI-10. -;; -;; The support for SRFI-10 consists of the procedure -;; `define-reader-ctor' for defining new reader constructors and the -;; read syntax form -;; -;; #,(<ctor> <datum> ...) -;; -;; where <ctor> must be a symbol for which a read constructor was -;; defined previously. -;; -;; Example: -;; -;; (define-reader-ctor 'file open-input-file) -;; (define f '#,(file "/etc/passwd")) -;; (read-line f) -;; => -;; "root:x:0:0:root:/root:/bin/bash" -;; -;; Please note the quote before the #,(file ...) expression. This is -;; necessary because ports are not self-evaluating in Guile. -;; -;; This module is fully documented in the Guile Reference Manual. - -;;; Code: - -(define-module (srfi srfi-10) - :use-module (ice-9 rdelim) - :export (define-reader-ctor)) - -(cond-expand-provide (current-module) '(srfi-10)) - -;; This hash table stores the association between comma-hash tags and -;; the corresponding constructor procedures. -;; -(define reader-ctors (make-hash-table 31)) - -;; This procedure installs the procedure @var{proc} as the constructor -;; for the comma-hash tag @var{symbol}. -;; -(define (define-reader-ctor symbol proc) - (hashq-set! reader-ctors symbol proc) - (if #f #f)) ; Return unspecified value. - -;; Retrieve the constructor procedure for the tag @var{symbol} or -;; throw an error if no such tag is defined. -;; -(define (lookup symbol) - (let ((p (hashq-ref reader-ctors symbol #f))) - (if (procedure? p) - p - (error "unknown hash-comma tag " symbol)))) - -;; This is the actual reader extension. -;; -(define (hash-comma char port) - (let* ((obj (read port))) - (if (and (list? obj) (positive? (length obj)) (symbol? (car obj))) - (let ((p (lookup (car obj)))) - (let ((res (apply p (cdr obj)))) - res)) - (error "syntax error in hash-comma expression")))) - -;; Install the hash extension. -;; -(read-hash-extend #\, hash-comma) - -;;; srfi-10.scm ends here |