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|
;;;;
;;;; engines.stk -- Skribe Engines 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: 24-Jul-2003 20:33 (eg)
;;;; Last file update: 28-Oct-2004 21:21 (eg)
;;;;
(define-module SKRIBE-ENGINE-MODULE
(import SKRIBE-DEBUG-MODULE SKRIBE-EVAL-MODULE)
(export default-engine default-engine-set!
make-engine copy-engine find-engine
engine-custom engine-custom-set!
engine-format? engine-add-writer!
processor-get-engine
push-default-engine pop-default-engine)
)
;;; Module definition is split here because this file is read by the documentation
;;; Should be changed.
(select-module SKRIBE-ENGINE-MODULE)
(define *engines* '())
(define *default-engine* #f)
(define *default-engines* '())
(define (default-engine)
*default-engine*)
(define (default-engine-set! e)
(unless (engine? e)
(skribe-error 'default-engine-set! "bad engine ~S" e))
(set! *default-engine* e)
(set! *default-engines* (cons e *default-engines*))
e)
(define (push-default-engine e)
(set! *default-engines* (cons e *default-engines*))
(default-engine-set! e))
(define (pop-default-engine)
(if (null? *default-engines*)
(skribe-error 'pop-default-engine "Empty engine stack" '())
(begin
(set! *default-engines* (cdr *default-engines*))
(if (pair? *default-engines*)
(default-engine-set! (car *default-engines*))
(set! *default-engine* #f)))))
(define (processor-get-engine combinator newe olde)
(cond
((procedure? combinator)
(combinator newe olde))
((engine? newe)
newe)
(else
olde)))
(define (engine-format? fmt . e)
(let ((e (cond
((pair? e) (car e))
((engine? *skribe-engine*) *skribe-engine*)
(else (find-engine *skribe-engine*)))))
(if (not (engine? e))
(skribe-error 'engine-format? "No engine" e)
(string=? fmt (engine-format e)))))
;;;
;;; MAKE-ENGINE
;;;
(define (make-engine ident :key (version 'unspecified)
(format "raw")
(filter #f)
(delegate #f)
(symbol-table '())
(custom '())
(info '()))
(let ((e (make <engine> :ident ident :version version :format format
:filter filter :delegate delegate
:symbol-table symbol-table
:custom custom :info info)))
;; store the engine in the global table
(set! *engines* (cons e *engines*))
;; return it
e))
;;;
;;; COPY-ENGINE
;;;
(define (copy-engine ident e :key (version 'unspecified)
(filter #f)
(delegate #f)
(symbol-table #f)
(custom #f))
(let ((new (shallow-clone e)))
(slot-set! new 'ident ident)
(slot-set! new 'version version)
(slot-set! new 'filter (or filter (slot-ref e 'filter)))
(slot-set! new 'delegate (or delegate (slot-ref e 'delegate)))
(slot-set! new 'symbol-table (or symbol-table (slot-ref e 'symbol-table)))
(slot-set! new 'customs (or custom (slot-ref e 'customs)))
(set! *engines* (cons new *engines*))
new))
;;;
;;; FIND-ENGINE
;;;
(define (%find-loaded-engine id version)
(let Loop ((es *engines*))
(cond
((null? es) #f)
((eq? (slot-ref (car es) 'ident) id)
(cond
((eq? version 'unspecified) (car es))
((eq? version (slot-ref (car es) 'version)) (car es))
(else (Loop (cdr es)))))
(else (loop (cdr es))))))
(define (find-engine id :key (version 'unspecified))
(with-debug 5 'find-engine
(debug-item "id=" id " version=" version)
(or (%find-loaded-engine id version)
(let ((c (assq id *skribe-auto-load-alist*)))
(debug-item "c=" c)
(if (and c (string? (cdr c)))
(begin
(skribe-load (cdr c) :engine 'base)
(%find-loaded-engine id version))
#f)))))
;;;
;;; ENGINE-CUSTOM
;;;
(define (engine-custom e id)
(let* ((customs (slot-ref e 'customs))
(c (assq id customs)))
(if (pair? c)
(cadr c)
'unspecified)))
;;;
;;; ENGINE-CUSTOM-SET!
;;;
(define (engine-custom-set! e id val)
(let* ((customs (slot-ref e 'customs))
(c (assq id customs)))
(if (pair? c)
(set-car! (cdr c) val)
(slot-set! e 'customs (cons (list id val) customs)))))
;;;
;;; ENGINE-ADD-WRITER!
;;;
(define (engine-add-writer! e ident pred upred opt before action after class valid)
(define (check-procedure name proc arity)
(cond
((not (procedure? proc))
(skribe-error ident "Illegal procedure" proc))
((not (equal? (%procedure-arity proc) arity))
(skribe-error ident
(format #f "Illegal ~S procedure" name)
proc))))
(define (check-output name proc)
(and proc (or (string? proc) (check-procedure name proc 2))))
;;
;; Engine-add-writer! starts here
;;
(unless (is-a? e <engine>)
(skribe-error ident "Illegal engine" e))
;; check the options
(unless (or (eq? opt 'all) (list? opt))
(skribe-error ident "Illegal options" opt))
;; check the correctness of the predicate
(check-procedure "predicate" pred 2)
;; check the correctness of the validation proc
(when valid
(check-procedure "validate" valid 2))
;; check the correctness of the three actions
(check-output "before" before)
(check-output "action" action)
(check-output "after" after)
;; create a new writer and bind it
(let ((n (make <writer>
:ident (if (symbol? ident) ident 'all)
:class class :pred pred :upred upred :options opt
:before before :action action :after after
:validate valid)))
(slot-set! e 'writers (cons n (slot-ref e 'writers)))
n))
;;;; ======================================================================
;;;;
;;;; I N I T S
;;;;
;;;; ======================================================================
;; A base engine must pre-exist before anything is loaded. In
;; particular, this dummy base engine is used to load the actual
;; definition of base.
(make-engine 'base :version 'bootstrap)
(select-module STklos)
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