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;;; guile-syntax-highlight -- General-purpose syntax highlighter
;;; Copyright © 2015 David Thompson <davet@gnu.org>
;;;
;;; Guile-syntax-highlight is free software; you can redistribute it
;;; and/or modify it under the terms of the GNU Lesser General Public
;;; License as published by the Free Software Foundation; either
;;; version 3 of the License, or (at your option) any later version.
;;;
;;; Guile-syntax-highlight 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 Lesser General Public License for more details.
;;;
;;; You should have received a copy of the GNU Lesser General Public
;;; License along with guile-syntax-highlight. If not, see
;;; <http://www.gnu.org/licenses/>.
;;; Commentary:
;;
;; General-purpose syntax highlighting framework.
;;
;;; Code:
(define-module (syntax-highlight)
#:use-module (ice-9 match)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-11)
#:use-module (srfi srfi-26)
#:use-module (srfi srfi-41)
#:use-module (syntax-highlight utils)
#:export (highlight
highlights->sxml))
(define* (highlight highlighter #:optional (stream (current-input-port)))
"Apply HIGHLIGHTER, a syntax highlighting procedure, to STREAM.
STREAM may be an open port, string, or SRFI-41 character stream. If
STREAM is not specified, characters are read from the current input
port."
(let-values (((result remaining)
(highlighter (cond
((port? stream)
(port->stream stream))
((string? stream)
(string->stream stream))
((stream? stream)
stream)
(else
(error "Cannot convert to stream: " stream))))))
;; If there's a remainder, it means that parsing failed. We want
;; to preserve *all* of the input text, even if it is invalid.
;; So, we take the stuff that could be parsed and tack on the
;; stuff that wasn't.
(if (stream-null? remaining)
result
(append result (list (stream->string remaining))))))
(define (highlights->sxml highlights)
"Convert HIGHLIGHTS, a list of syntax highlighting expressions, into
a list of SXML 'span' nodes. Each 'span' node has a 'class' attribute
corresponding to the highlighting tag name."
(define (tag->class tag)
(string-append "syntax-" (symbol->string tag)))
(map (match-lambda
((? string? str) str)
((tag text)
`(span (@ (class ,(tag->class tag))) ,text)))
highlights))
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