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-rw-r--r--src/guile/skribilo/reader/Makefile.am2
-rw-r--r--src/guile/skribilo/reader/outline.scm266
2 files changed, 267 insertions, 1 deletions
diff --git a/src/guile/skribilo/reader/Makefile.am b/src/guile/skribilo/reader/Makefile.am
index a1c58fb..807e4a7 100644
--- a/src/guile/skribilo/reader/Makefile.am
+++ b/src/guile/skribilo/reader/Makefile.am
@@ -1,2 +1,2 @@
guilemoduledir = $(GUILE_SITE)/skribilo/reader
-dist_guilemodule_DATA = skribe.scm
+dist_guilemodule_DATA = skribe.scm outline.scm
diff --git a/src/guile/skribilo/reader/outline.scm b/src/guile/skribilo/reader/outline.scm
new file mode 100644
index 0000000..54b3a27
--- /dev/null
+++ b/src/guile/skribilo/reader/outline.scm
@@ -0,0 +1,266 @@
+;;; outline.scm -- A reader for Emacs' outline syntax.
+;;;
+;;; Copyright 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+;;; USA.
+
+(define-module (skribilo reader outline)
+ :use-module (skribilo utils syntax)
+ :use-module (skribilo reader)
+ :use-module (ice-9 optargs)
+ :use-module (srfi srfi-11)
+
+ :autoload (ice-9 rdelim) (read-line)
+ :autoload (ice-9 regex) (make-regexp)
+
+ :export (reader-specification
+ make-outline-reader))
+
+(fluid-set! current-reader %skribilo-module-reader)
+
+;;; Author: Ludovic Courtès
+;;;
+;;; Commentary:
+;;;
+;;; A reader for Emacs' outline-mode syntax.
+;;;
+;;; Code:
+
+
+;;;
+;;; In-line markup, i.e., markup that doesn't span over multiple lines.
+;;;
+
+(define %inline-markup
+ `(("_([^_]+)_" .
+ ,(lambda (m)
+ (values (match:prefix m) ;; before
+ (match:substring m 1) ;; body
+ (match:suffix m) ;; after
+ (lambda (body) `(emph ,body))))) ;; process-body
+ ("\\/([^\\/]+)\\/" .
+ ,(lambda (m)
+ (values (match:prefix m)
+ (match:substring m 1)
+ (match:suffix m)
+ (lambda (body) `(it ,body)))))
+ ("\\*([^\\*]+)\\*" .
+ ,(lambda (m)
+ (values (match:prefix m)
+ (match:substring m 1)
+ (match:suffix m)
+ (lambda (body) `(bold ,body)))))
+ ("`(([^`]|[^'])+)'" .
+ ,(lambda (m)
+ (values (match:prefix m)
+ (match:substring m 1)
+ (match:suffix m)
+ (lambda (body) `(tt ,body)))))))
+
+(define (make-markup-processor rx proc)
+ (lambda (line)
+ (let ((match (regexp-exec rx line)))
+ (if match
+ (proc match)
+ #f))))
+
+(define (append-trees . trees)
+ "Append markup trees @var{trees}. Trees whose car is a symbol will be
+considered as sub-trees of the resulting tree."
+ (let loop ((trees trees)
+ (result '()))
+ (if (null? trees)
+ result
+ (let ((tree (car trees)))
+ (loop (cdr trees)
+ (append result
+ (if (list? tree)
+ (cond ((symbol? (car tree)) (list tree))
+ (else tree))
+ (list tree))))))))
+
+(define (make-line-processor markup-alist)
+ "Returns a @dfn{line processor}. A line processor is a procedure that
+takes a string and returns a list."
+ (let* ((markups (map (lambda (rx+proc)
+ (cons (make-regexp (car rx+proc) regexp/extended)
+ (cdr rx+proc)))
+ markup-alist))
+ (procs (map (lambda (rx+proc)
+ (make-markup-processor (car rx+proc) (cdr rx+proc)))
+ markups)))
+ (lambda (line)
+ (let self ((line line))
+ (format #t "self: ~a~%" line)
+ (cond ((string? line)
+ (let loop ((procs procs))
+ (if (null? procs)
+ line
+ (let ((result (apply (car procs) (list line))))
+ (if result
+ (let-values (((before body after proc-body)
+ result))
+ (append-trees (self before)
+ (proc-body (self body))
+ (self after)))
+ (loop (cdr procs)))))))
+ (else
+ (error "line-processor: internal error" line)))))))
+
+(define %line-processor
+ (make-line-processor %inline-markup))
+
+
+;;;
+;;; Large-scale structures: paragraphs, chapters, sections, etc.
+;;;
+
+(define (process-paragraph line line-proc port)
+ (let loop ((line line)
+ (result '()))
+ (if (or (eof-object? line) (string=? line ""))
+ (cons 'p result)
+ (loop (read-line port)
+ (let ((line (line-proc line)))
+ (append result
+ (if (list? line) line (list line))))))))
+
+(define (make-node-processor rx node-type title-proc line-proc
+ subnode-proc end-of-node?)
+ "Return a procedure that reads the given string and return an AST node of
+type @var{node-type} or @code{#f}. When the original string matches the node
+header, then the rest of the node is read from @var{port}."
+ (lambda (line port)
+ (let ((match (regexp-exec rx line)))
+ (if (not match)
+ #f
+ (let ((title (title-proc match)))
+ (let loop ((line (read-line port))
+ (body '()))
+ (cond ((or (eof-object? line)
+ (regexp-exec rx line)
+ (and (procedure? end-of-node?)
+ (end-of-node? line)))
+ (values line
+ `(,node-type :title ,title ,@(reverse! body))))
+
+ ((string=? "" line)
+ (loop (read-line port) body))
+
+ (else
+ (let ((subnode (and subnode-proc
+ (apply subnode-proc
+ (list line port)))))
+ (if subnode
+ (let-values (((line node) subnode))
+ (loop line (cons node body)))
+ (let ((par (process-paragraph line line-proc port)))
+ (loop (read-line port)
+ (cons par body)))))))))))))
+
+
+(define (node-markup-line? line)
+ (define node-rx (make-regexp "^\\*+ (.+)$" regexp/extended))
+ (regexp-exec node-rx line))
+
+(define %node-processors
+ (let ((section-proc
+ (make-node-processor (make-regexp "^\\*\\* (.+)$" regexp/extended)
+ 'section
+ (lambda (m) (match:substring m 1))
+ %line-processor
+ #f
+ node-markup-line?)))
+ (list (make-node-processor (make-regexp "^\\* (.+)$" regexp/extended)
+ 'chapter
+ (lambda (m) (match:substring m 1))
+ %line-processor
+ section-proc
+ #f))))
+
+
+
+
+;;;
+;;; The top-level parser.
+;;;
+
+(define (make-document-processor node-procs line-proc port)
+ (lambda (line port)
+ (let self ((line line)
+ (doc '()))
+ (format #t "doc-proc: ~a~%" line)
+ (if (eof-object? line)
+ (reverse! doc)
+ (let loop ((node-procs node-procs))
+ (if (null? node-procs)
+ (self (read-line port)
+ (cons (process-paragraph line line-proc port) doc))
+ (let ((result (apply (car node-procs) (list line port))))
+ (if result
+ (let-values (((line node) result))
+ (self line (cons node doc)))
+ (loop (cdr node-procs))))))))))
+
+
+(define* (outline-reader :optional (port (current-input-port)))
+ (define modeline-rx
+ (make-regexp "^[[:space:]]*-\\*- [a-zA-Z-]+ -\\*-[[:space:]]*$"))
+ (define title-rx (make-regexp "^[Tt]itle: (.+)$" regexp/extended))
+ (define author-rx (make-regexp "^[Aa]uthor: (.+)$" regexp/extended))
+
+ (let ((doc-proc (make-document-processor %node-processors %line-processor
+ port)))
+
+ (let loop ((title #f)
+ (author #f)
+ (line (read-line port)))
+
+ (if (eof-object? line)
+ `(document :title ,title :author (author :name ,author) '())
+ (if (or (string=? line "")
+ (regexp-exec modeline-rx line))
+ (loop title author (read-line port))
+ (let ((title-match (regexp-exec title-rx line)))
+ (if title-match
+ (loop (match:substring title-match 1)
+ author (read-line port))
+ (let ((author-match (regexp-exec author-rx line)))
+ (if author-match
+ (loop title (match:substring author-match 1)
+ (read-line port))
+
+ ;; Let's go.
+ `(document :title ,title
+ :author (author :name ,author)
+ ,@(doc-proc line port)))))))))))
+
+
+(define* (make-outline-reader :optional (version "0.1"))
+ outline-reader)
+
+
+
+;;; The reader specification.
+
+(define-reader outline "0.1" make-outline-reader)
+
+
+;;; arch-tag: 53473e73-c811-4eed-a0b4-22ada4d6ef08
+
+;;; outline.scm ends here
+
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