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;;;;
;;;; writer.stk -- Skribe Writer 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: 15-Sep-2003 22:21 (eg)
;;;; Last file update: 4-Mar-2004 10:48 (eg)
;;;;
(define-module (skribe writer)
:export (invoke markup-writer markup-writer-get markup-writer-get*
lookup-markup-writer copy-markup-writer))
(use-modules (skribe debug)
; (skribe engine)
(skribe output)
(oop goops)
(ice-9 optargs))
;;;; ======================================================================
;;;;
;;;; INVOKE
;;;;
;;;; ======================================================================
(define (invoke proc node e)
(with-debug 5 'invoke
(debug-item "e=" (engine-ident e))
(debug-item "node=" node " " (if (markup? node) (markup-markup node) ""))
(if (string? proc)
(display proc)
(if (procedure? proc)
(proc node e)))))
;;;; ======================================================================
;;;;
;;;; LOOKUP-MARKUP-WRITER
;;;;
;;;; ======================================================================
(define (lookup-markup-writer node e)
(let ((writers (slot-ref e 'writers))
(delegate (slot-ref e 'delegate)))
(let Loop ((w* writers))
(cond
((pair? w*)
(let ((pred (slot-ref (car w*) 'pred)))
(if (pred node e)
(car w*)
(loop (cdr w*)))))
((engine? delegate)
(lookup-markup-writer node delegate))
(else
#f)))))
;;;; ======================================================================
;;;;
;;;; MAKE-WRITER-PREDICATE
;;;;
;;;; ======================================================================
(define (make-writer-predicate markup predicate class)
(let* ((t1 (if (symbol? markup)
(lambda (n e) (is-markup? n markup))
(lambda (n e) #t)))
(t2 (if class
(lambda (n e)
(and (t1 n e) (equal? (markup-class n) class)))
t1)))
(if predicate
(cond
((not (procedure? predicate))
(skribe-error 'markup-writer
"Illegal predicate (procedure expected)"
predicate))
((not (eq? (%procedure-arity predicate) 2))
(skribe-error 'markup-writer
"Illegal predicate arity (2 arguments expected)"
predicate))
(else
(lambda (n e)
(and (t2 n e) (predicate n e)))))
t2)))
;;;; ======================================================================
;;;;
;;;; MARKUP-WRITER
;;;;
;;;; ======================================================================
(define* (markup-writer markup #:optional engine
#:key (predicate #f) (class #f) (options '())
(validate #f)
(before #f) (action 'unspecified) (after #f))
(let ((e (or engine (default-engine))))
(cond
((and (not (symbol? markup)) (not (eq? markup #t)))
(skribe-error 'markup-writer "Illegal markup" markup))
((not (engine? e))
(skribe-error 'markup-writer "Illegal engine" e))
((and (not predicate)
(not class)
(null? options)
(not before)
(eq? action 'unspecified)
(not after))
(skribe-error 'markup-writer "Illegal writer" markup))
(else
(let ((m (make-writer-predicate markup predicate class))
(ac (if (eq? action 'unspecified)
(lambda (n e) (output (markup-body n) e))
action)))
(engine-add-writer! e markup m predicate
options before ac after class validate))))))
;;;; ======================================================================
;;;;
;;;; MARKUP-WRITER-GET
;;;;
;;;; ======================================================================
(define* (markup-writer-get markup :optional engine :key (class #f) (pred #f))
(let ((e (or engine (default-engine))))
(cond
((not (symbol? markup))
(skribe-error 'markup-writer-get "Illegal symbol" markup))
((not (engine? e))
(skribe-error 'markup-writer-get "Illegal engine" e))
(else
(let liip ((e e))
(let loop ((w* (slot-ref e 'writers)))
(cond
((pair? w*)
(if (and (eq? (writer-ident (car w*)) markup)
(equal? (writer-class (car w*)) class)
(or (unspecified? pred)
(eq? (slot-ref (car w*) 'upred) pred)))
(car w*)
(loop (cdr w*))))
((engine? (slot-ref e 'delegate))
(liip (slot-ref e 'delegate)))
(else
#f))))))))
;;;; ======================================================================
;;;;
;;;; MARKUP-WRITER-GET*
;;;;
;;;; ======================================================================
;; Finds all writers that matches MARKUP with optional CLASS attribute.
(define* (markup-writer-get* markup #:optional engine #:key (class #f))
(let ((e (or engine (default-engine))))
(cond
((not (symbol? markup))
(skribe-error 'markup-writer "Illegal symbol" markup))
((not (engine? e))
(skribe-error 'markup-writer "Illegal engine" e))
(else
(let liip ((e e)
(res '()))
(let loop ((w* (slot-ref e 'writers))
(res res))
(cond
((pair? w*)
(if (and (eq? (slot-ref (car w*) 'ident) markup)
(equal? (slot-ref (car w*) 'class) class))
(loop (cdr w*) (cons (car w*) res))
(loop (cdr w*) res)))
((engine? (slot-ref e 'delegate))
(liip (slot-ref e 'delegate) res))
(else
(reverse! res)))))))))
;;; ======================================================================
;;;;
;;;; COPY-MARKUP-WRITER
;;;;
;;;; ======================================================================
(define* (copy-markup-writer markup old-engine :optional new-engine
:key (predicate 'unspecified)
(class 'unspecified)
(options 'unspecified)
(validate 'unspecified)
(before 'unspecified)
(action 'unspecified)
(after 'unspecified))
(let ((old (markup-writer-get markup old-engine))
(new-engine (or new-engine old-engine)))
(markup-writer markup new-engine
:pred (if (unspecified? predicate) (slot-ref old 'pred) predicate)
:class (if (unspecified? class) (slot-ref old 'class) class)
:options (if (unspecified? options) (slot-ref old 'options) options)
:validate (if (unspecified? validate) (slot-ref old 'validate) validate)
:before (if (unspecified? before) (slot-ref old 'before) before)
:action (if (unspecified? action) (slot-ref old 'action) action)
:after (if (unspecified? after) (slot-ref old 'after) after))))
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