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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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