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Diffstat (limited to 'src/guile/skribilo/reader/skribe.scm')
| -rw-r--r-- | src/guile/skribilo/reader/skribe.scm | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/src/guile/skribilo/reader/skribe.scm b/src/guile/skribilo/reader/skribe.scm new file mode 100644 index 0000000..d3dbb5f --- /dev/null +++ b/src/guile/skribilo/reader/skribe.scm @@ -0,0 +1,113 @@ +;;; skribe.scm -- A reader for the Skribe syntax. +;;; +;;; Copyright 2005, 2006 Ludovic Courtès <ludovic.courtes@laas.fr> +;;; +;;; +;;; 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 of the License, 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 program; if not, write to the Free Software +;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, +;;; USA. + +(define-module (skribilo reader skribe) + :use-module (skribilo reader) + :use-module (ice-9 optargs) + :use-module (srfi srfi-1) + + ;; the Scheme reader composition framework + :use-module ((system reader) #:renamer (symbol-prefix-proc 'r:)) + + :export (reader-specification + make-skribe-reader)) + +;;; Author: Ludovic Courtès +;;; +;;; Commentary: +;;; +;;; A reader for the Skribe syntax, i.e. roughly R5RS Scheme plus DSSSL-style +;;; keywords and sk-exps (expressions introduced using a square bracket). +;;; +;;; Code: + +;;; Note: We need guile-reader 0.2 at least. + +(define* (make-skribe-reader #:optional (version "1.2d")) + "Return a Skribe reader (a procedure) suitable for version @var{version} of +the Skribe syntax." + (if (string> version "1.2d") + (error "make-skribe-reader: unsupported version" version) + %skribe-reader)) + +(define (make-colon-free-token-reader tr) + ;; Stolen from `guile-reader' 0.3. + "If token reader @var{tr} handles the @code{:} (colon) character, remove it +from its specification and return the new token reader." + (let* ((spec (r:token-reader-specification tr)) + (proc (r:token-reader-procedure tr))) + (r:make-token-reader (filter (lambda (chr) + (not (char=? chr #\:))) + spec) + proc))) + +(define &sharp-reader + ;; The reader for what comes after a `#' character. + (let* ((dsssl-keyword-reader ;; keywords à la `#!key' + (r:make-token-reader #\! + (r:token-reader-procedure + (r:standard-token-reader 'keyword))))) + (r:make-reader (cons dsssl-keyword-reader + (map r:standard-token-reader + '(character srfi-4 vector + number+radix boolean + srfi30-block-comment + srfi62-sexp-comment))) + #f ;; use default fault handler + 'reader/record-positions))) + +(define (%make-skribe-reader) + (let ((colon-keywords ;; keywords à la `:key' fashion + (r:make-token-reader #\: + (r:token-reader-procedure + (r:standard-token-reader 'keyword)))) + (symbol-misc-chars-tr + ;; Make sure `:' is handled only by the keyword token reader. + (make-colon-free-token-reader + (r:standard-token-reader 'r6rs-symbol-misc-chars)))) + + + ;; Note: we use the `r6rs-symbol-*' and `r6rs-number' token readers since + ;; they consider square brackets as delimiters. + (r:make-reader (cons* (r:make-token-reader #\# &sharp-reader) + colon-keywords + symbol-misc-chars-tr + (map r:standard-token-reader + `(whitespace + sexp string r6rs-number + r6rs-symbol-lower-case + r6rs-symbol-upper-case + quote-quasiquote-unquote + semicolon-comment + skribe-exp))) + #f ;; use the default fault handler + 'reader/record-positions + ))) + +;; We actually cache an instance here. +(define %skribe-reader (%make-skribe-reader)) + + + +;;; The reader specification. + +(define-reader skribe "1.2d" make-skribe-reader) + +;;; skribe.scm ends here |