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|
;;; writer.scm -- Markup writers.
;;;
;;; Copyright 2003, 2004 Erick Gallesio - I3S-CNRS/ESSI <eg@essi.fr>
;;; Copyright 2005, 2006 Ludovic Court�s <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 writer)
:export (<writer> writer? write-object writer-options writer-ident
writer-before writer-action writer-after writer-class
invoke markup-writer markup-writer-get markup-writer-get*
lookup-markup-writer copy-markup-writer)
:use-module (skribilo utils syntax)
:autoload (srfi srfi-1) (find filter)
:autoload (skribilo engine) (engine-class? engine-ident
default-engine-class))
(use-modules (skribilo debug)
(skribilo output)
(skribilo ast)
(skribilo lib)
(oop goops)
(ice-9 optargs))
(fluid-set! current-reader %skribilo-module-reader)
;;;
;;; Class definition.
;;;
(define-class <writer> ()
(ident :init-keyword :ident :init-value '??? :getter writer-ident)
(class :init-keyword :class :init-value 'unspecified
:getter writer-class)
(pred :init-keyword :pred :init-value 'unspecified)
(upred :init-keyword :upred :init-value 'unspecified)
(options :init-keyword :options :init-value '() :getter writer-options)
(verified? :init-keyword :verified? :init-value #f)
(validate :init-keyword :validate :init-value #f)
(before :init-keyword :before :init-value #f :getter writer-before)
(action :init-keyword :action :init-value #f :getter writer-action)
(after :init-keyword :after :init-value #f :getter writer-after))
(define (writer? obj)
(is-a? obj <writer>))
(define-method (write (obj <writer>) port)
(format port "#[~A (~A) ~A]"
(class-name (class-of obj))
(slot-ref obj 'ident)
(object-address obj)))
;;;
;;; Writer methods.
;;;
(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)))))
(define (make-writer-predicate markup predicate class)
(define (%always-true n e) #t)
(let* ((t2 (if class
(lambda (n e)
(and (equal? (markup-class n) class)))
#f)))
(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
(if (procedure? t2)
(lambda (n e)
(and (t2 n e) (predicate n e)))
predicate)))
t2)))
;;;
;;; `markup-writer'
;;;
(define* (markup-writer markup ;; #:optional (engine #f)
#:key (predicate #f) (class #f) (options '())
(validate #f)
(before #f)
(action 'unspecified)
(after #f)
#:rest engine)
;;; FIXME: `lambda*' sucks and fails when both optional arguments and
;;; keyword arguments are used together. In particular, if ENGINE is not
;;; specified by the caller but other keyword arguments are specified, it
;;; will consider the value of ENGINE to be the first keyword found.
; (let ((e (or engine (default-engine))))
(let ((e (or (if (and (list? engine) (not (keyword? (car engine))))
(car engine)
#f)
(default-engine-class))))
(cond
((and (not (symbol? markup)) (not (eq? markup #t)))
(skribe-error 'markup-writer "illegal markup" markup))
((not (engine-class? e))
(skribe-error 'markup-writer "illegal engine class" 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-class-add-writer! e markup m predicate
options before ac after
class validate))))))
;;;
;;; Finding a markup writer.
;;;
(define (lookup-markup-writer node e)
;; Find the writer that applies best to NODE. E should be an engine class.
;; See also `markup-writer-get' and `markup-writer-get*'.
(define (matching-writer writers)
(find (lambda (w)
(let ((pred (slot-ref w 'pred)))
(if (procedure? pred)
(pred node e)
#t)))
writers))
(let* ((writers (slot-ref e 'writers))
(node-writers (hashq-ref writers (markup-markup node) '()))
(delegate (slot-ref e 'delegate)))
(or (matching-writer node-writers)
(matching-writer (slot-ref e 'free-writers))
(and (engine-class? delegate)
(lookup-markup-writer node delegate)))))
(define* (markup-writer-get markup :optional engine :key (class #f) (pred #f))
;; Get a markup writer for MARKUP (a symbol) in engine class ENGINE, with
;; class CLASS and user predicate PRED. [FIXME: Useless since PRED is a
;; procedure and therefore not comparable?]
(define (matching-writer writers)
(find (lambda (w)
(and (if class (equal? (writer-class w) class) #t)
(or (unspecified? pred)
(eq? (slot-ref w 'upred) pred))))
writers))
(let ((e (or engine (default-engine-class))))
(cond
((not (symbol? markup))
(skribe-error 'markup-writer-get "illegal symbol" markup))
((not (engine-class? e))
(skribe-error 'markup-writer-get "illegal engine class" e))
(else
(let* ((writers (slot-ref e 'writers))
(markup-writers (hashq-ref writers markup '()))
(delegate (slot-ref e 'delegate)))
(or (matching-writer markup-writers)
(and (engine-class? delegate)
(markup-writer-get markup delegate
:class class :pred pred))))))))
(define* (markup-writer-get* markup #:optional engine #:key (class #f))
;; Finds all writers, recursively going through the engine hierarchy, that
;; match MARKUP with optional CLASS attribute.
(define (matching-writers writers)
(filter (lambda (w)
(or (not class)
(equal? (writer-class w) class)))
writers))
(let ((e (or engine (default-engine-class))))
(cond
((not (symbol? markup))
(skribe-error 'markup-writer "illegal symbol" markup))
((not (engine-class? e))
(skribe-error 'markup-writer "illegal engine class" e))
(else
(let* ((writers (slot-ref e 'writers))
(markup-writers (hashq-ref writers markup '()))
(delegate (slot-ref e 'delegate)))
(append (matching-writers writers)
(if (engine-class? delegate)
(markup-writer-get* markup delegate :class class)
'())))))))
(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))))
;;; writer.scm ends here
|
