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;;;;
;;;; source.stk -- Skibe SOURCE implementation stuff
;;;;
;;;; Copyright � 2003-2004 Erick Gallesio - I3S-CNRS/ESSI <eg@essi.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., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
;;;; USA.
;;;;
;;;; Author: Erick Gallesio [eg@essi.fr]
;;;; Creation date: 3-Sep-2003 12:22 (eg)
;;;; Last file update: 27-Oct-2004 20:09 (eg)
;;;;
(define-module (skribe source)
:export (source-read-lines source-read-definition source-fontify))
;; Temporary solution
(define (language-extractor lang)
(slot-ref lang 'extractor))
(define (language-fontifier lang)
(slot-ref lang 'fontifier))
;*---------------------------------------------------------------------*/
;* source-read-lines ... */
;*---------------------------------------------------------------------*/
(define (source-read-lines file start stop tab)
(let ((p (find-path file (skribe-source-path))))
(if (or (not (string? p)) (not (file-exists? p)))
(skribe-error 'source
(format "Can't find `~a' source file in path" file)
(skribe-source-path))
(with-input-from-file p
(lambda ()
(if (> *skribe-verbose* 0)
(format (current-error-port) " [source file: ~S]\n" p))
(let ((startl (if (string? start) (string-length start) -1))
(stopl (if (string? stop) (string-length stop) -1)))
(let loop ((l 1)
(armedp (not (or (integer? start) (string? start))))
(s (read-line))
(r '()))
(cond
((or (eof-object? s)
(and (integer? stop) (> l stop))
(and (string? stop) (substring=? stop s stopl)))
(apply string-append (reverse! r)))
(armedp
(loop (+ l 1)
#t
(read-line)
(cons* "\n" (untabify s tab) r)))
((and (integer? start) (>= l start))
(loop (+ l 1)
#t
(read-line)
(cons* "\n" (untabify s tab) r)))
((and (string? start) (substring=? start s startl))
(loop (+ l 1) #t (read-line) r))
(else
(loop (+ l 1) #f (read-line) r))))))))))
;*---------------------------------------------------------------------*/
;* untabify ... */
;*---------------------------------------------------------------------*/
(define (untabify obj tab)
(if (not tab)
obj
(let ((len (string-length obj))
(tabl tab))
(let loop ((i 0)
(col 1))
(cond
((= i len)
(let ((nlen (- col 1)))
(if (= len nlen)
obj
(let ((new (make-string col #\space)))
(let liip ((i 0)
(j 0)
(col 1))
(cond
((= i len)
new)
((char=? (string-ref obj i) #\tab)
(let ((next-tab (* (/ (+ col tabl)
tabl)
tabl)))
(liip (+ i 1)
next-tab
next-tab)))
(else
(string-set! new j (string-ref obj i))
(liip (+ i 1) (+ j 1) (+ col 1)))))))))
((char=? (string-ref obj i) #\tab)
(loop (+ i 1)
(* (/ (+ col tabl) tabl) tabl)))
(else
(loop (+ i 1) (+ col 1))))))))
;*---------------------------------------------------------------------*/
;* source-read-definition ... */
;*---------------------------------------------------------------------*/
(define (source-read-definition file definition tab lang)
(let ((p (find-path file (skribe-source-path))))
(cond
((not (language-extractor lang))
(skribe-error 'source
"The specified language has not defined extractor"
(slot-ref lang 'name)))
((or (not p) (not (file-exists? p)))
(skribe-error 'source
(format "Can't find `~a' program file in path" file)
(skribe-source-path)))
(else
(let ((ip (open-input-file p)))
(if (> *skribe-verbose* 0)
(format (current-error-port) " [source file: ~S]\n" p))
(if (not (input-port? ip))
(skribe-error 'source "Can't open file for input" p)
(unwind-protect
(let ((s ((language-extractor lang) ip definition tab)))
(if (not (string? s))
(skribe-error 'source
"Can't find definition"
definition)
s))
(close-input-port ip))))))))
;*---------------------------------------------------------------------*/
;* source-fontify ... */
;*---------------------------------------------------------------------*/
(define (source-fontify o language)
(define (fontify f o)
(cond
((string? o) (f o))
((pair? o) (map (lambda (s) (if (string? s) (f s) (fontify f s))) o))
(else o)))
(let ((f (language-fontifier language)))
(if (procedure? f)
(fontify f o)
o)))
;*---------------------------------------------------------------------*/
;* split-string-newline ... */
;*---------------------------------------------------------------------*/
(define (split-string-newline str)
(let ((l (string-length str)))
(let loop ((i 0)
(j 0)
(r '()))
(cond
((= i l)
(if (= i j)
(reverse! r)
(reverse! (cons (substring str j i) r))))
((char=? (string-ref str i) #\Newline)
(loop (+ i 1)
(+ i 1)
(if (= i j)
(cons 'eol r)
(cons* 'eol (substring str j i) r))))
((and (char=? (string-ref str i) #\cr)
(< (+ i 1) l)
(char=? (string-ref str (+ i 1)) #\Newline))
(loop (+ i 2)
(+ i 2)
(if (= i j)
(cons 'eol r)
(cons* 'eol (substring str j i) r))))
(else
(loop (+ i 1) j r))))))
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