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;;; output.scm -- Skribilo output stage.
;;;
;;; Copyright 2003, 2004 Erick Gallesio - I3S-CNRS/ESSI <eg@unice.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 output)
:autoload (skribilo engine) (engine-ident processor-get-engine)
:autoload (skribilo writer) (writer? writer-ident lookup-markup-writer)
:autoload (skribilo location) (location?)
:use-module (skribilo ast)
:use-module (skribilo debug)
:use-module (skribilo utils syntax)
:use-module (oop goops)
:use-module (skribilo condition)
:use-module (srfi srfi-35)
:use-module (srfi srfi-34)
:use-module (srfi srfi-39)
:export (output
*document-being-output*
&output-error &output-unresolved-error &output-writer-error
output-error? output-unresolved-error? output-writer-error?))
(fluid-set! current-reader %skribilo-module-reader)
;;;
;;; Error conditions.
;;;
(define-condition-type &output-error &skribilo-error
output-error?)
(define-condition-type &output-unresolved-error &output-error
output-unresolved-error?
(ast output-unresolved-error:ast))
(define-condition-type &output-writer-error &output-error
output-writer-error?
(writer output-writer-error:writer))
(define (handle-output-error c)
;; Issue a user-friendly error message for error condition C.
(cond ((output-unresolved-error? c)
(let* ((node (output-unresolved-error:ast c))
(location (and (ast? node) (ast-loc node))))
(format (current-error-port) "unresolved node: ~a~a~%"
node
(if (location? location)
(string-append " "
(location-file location) ":"
(location-line location))
""))))
((output-writer-error? c)
(format (current-error-port) "invalid writer: ~a~%"
(output-writer-error:writer c)))
(else
(format (current-error-port) "undefined output error: ~a~%"
c))))
(register-error-condition-handler! output-error?
handle-output-error)
;;;
;;; Output method.
;;;
;; The document being output. Note: This is only meant to be used by the
;; compatibility layer in order to implement things like `find-markups'!
(define *document-being-output* (make-parameter #f))
(define-generic out)
(define (%out/writer n e w)
(with-debug 5 'out/writer
(debug-item "n=" n " " (if (markup? n) (markup-markup n) ""))
(debug-item "e=" (engine-ident e))
(debug-item "w=" (writer-ident w))
(when (writer? w)
(invoke (slot-ref w 'before) n e)
(invoke (slot-ref w 'action) n e)
(invoke (slot-ref w 'after) n e))))
(define (output node e . writer)
(with-debug 3 'output
(debug-item "node=" node " " (if (markup? node) (markup-markup node) ""))
(debug-item "writer=" writer)
(if (null? writer)
(out node e)
(cond
((is-a? (car writer) <writer>)
(%out/writer node e (car writer)))
((not (car writer))
(raise (condition (&output-writer-error (writer writer)))))
(else
(raise (condition (&output-writer-error (writer writer)))))))))
;;;
;;; OUT implementations
;;;
(define-method (out node e)
#f)
(define-method (out (node <document>) e)
;; Only needed by the compatibility layer.
(parameterize ((*document-being-output* node))
(next-method)))
(define-method (out (node <pair>) e)
(let loop ((n* node))
(cond
((pair? n*)
(out (car n*) e)
(loop (cdr n*)))
((not (null? n*))
(raise (condition (&invalid-argument-error
(proc-name output)
(argument n*))))))))
(define-method (out (node <string>) e)
(let ((f (slot-ref e 'filter)))
(if (procedure? f)
(display (f node))
(display node))))
(define-method (out (node <number>) e)
(out (number->string node) e))
(define-method (out (n <processor>) e)
(let ((combinator (slot-ref n 'combinator))
(engine (slot-ref n 'engine))
(body (slot-ref n 'body))
(procedure (slot-ref n 'procedure)))
(let ((newe (processor-get-engine combinator engine e)))
(out (procedure body newe) newe))))
(define-method (out (n <command>) e)
(let* ((fmt (slot-ref n 'fmt))
(body (slot-ref n 'body))
(lb (length body))
(lf (string-length fmt)))
(define (loops i n)
(if (= i lf)
(begin
(if (> n 0)
(if (<= n lb)
(output (list-ref body (- n 1)) e)
(raise (condition (&too-few-arguments-error
(proc-name "output<command>")
(arguments n))))))
lf)
(let ((c (string-ref fmt i)))
(cond
((char=? c #\$)
(display "$")
(+ 1 i))
((not (char-numeric? c))
(cond
((= n 0)
i)
((<= n lb)
(output (list-ref body (- n 1)) e)
i)
(else
(raise (condition (&too-few-arguments-error
(proc-name "output<command>")
(arguments n)))))))
(else
(loops (+ i 1)
(+ (- (char->integer c)
(char->integer #\0))
(* 10 n))))))))
(let loop ((i 0))
(cond
((= i lf)
#f)
((not (char=? (string-ref fmt i) #\$))
(display (string-ref fmt i))
(loop (+ i 1)))
(else
(loop (loops (+ i 1) 0)))))))
(define-method (out (n <handle>) e)
'unspecified)
(define-method (out (n <unresolved>) e)
(raise (condition (&output-unresolved-error (ast n)))))
(define-method (out (node <markup>) e)
(let ((w (lookup-markup-writer node (engine-class e))))
(if (writer? w)
(%out/writer node e w)
(output (slot-ref node 'body) e))))
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