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|
;*=====================================================================*/
;* serrano/prgm/project/skribe/src/bigloo/engine.scm */
;* ------------------------------------------------------------- */
;* Author : Manuel Serrano */
;* Creation : Tue Sep 9 08:01:30 2003 */
;* Last change : Fri May 21 16:12:32 2004 (serrano) */
;* Copyright : 2003-04 Manuel Serrano */
;* ------------------------------------------------------------- */
;* Skribe engines */
;*=====================================================================*/
;*---------------------------------------------------------------------*/
;* The module */
;*---------------------------------------------------------------------*/
(module skribe_engine
(option (set! dsssl-symbol->keyword
(lambda (s)
(string->keyword
(string-append ":" (symbol->string s))))))
(include "debug.sch")
(import skribe_types
skribe_eval
skribe_param
skribe_output)
(export (make-engine::%engine ::symbol #!key v fmt in fi cu st if)
(copy-engine::%engine ::symbol ::%engine #!key v in fi cu st)
(find-engine ::symbol #!key version)
(default-engine::obj)
(default-engine-set! ::%engine)
(push-default-engine ::%engine)
(pop-default-engine)
(processor-get-engine ::obj ::obj ::%engine)
(engine-format? ::bstring . e)
(engine-custom::obj ::%engine ::symbol)
(engine-custom-set! ::%engine ::symbol ::obj)
(engine-add-writer! ::%engine ::obj ::procedure ::obj
::obj ::obj ::obj ::obj ::obj ::obj)))
;*---------------------------------------------------------------------*/
;* *engines* ... */
;*---------------------------------------------------------------------*/
(define *engines* '())
;*---------------------------------------------------------------------*/
;* *default-engine* ... */
;*---------------------------------------------------------------------*/
(define *default-engine* #f)
(define *default-engines* '())
;*---------------------------------------------------------------------*/
;* default-engine-set! ... */
;*---------------------------------------------------------------------*/
(define (default-engine-set! e)
(if (not (engine? e))
(skribe-type-error 'default-engine-set! "engine" e (find-runtime-type e))
(begin
(set! *default-engine* e)
(set! *default-engines* (cons *default-engine* *default-engines*))
e)))
;*---------------------------------------------------------------------*/
;* default-engine ... */
;*---------------------------------------------------------------------*/
(define (default-engine)
*default-engine*)
;*---------------------------------------------------------------------*/
;* push-default-engine ... */
;*---------------------------------------------------------------------*/
(define (push-default-engine e)
(set! *default-engines* (cons e *default-engines*))
(default-engine-set! e))
;*---------------------------------------------------------------------*/
;* pop-default-engine ... */
;*---------------------------------------------------------------------*/
(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)))))
;*---------------------------------------------------------------------*/
;* processor-get-engine ... */
;*---------------------------------------------------------------------*/
(define (processor-get-engine combinator newe olde)
(cond
((procedure? combinator)
(combinator newe olde))
((engine? newe)
newe)
(else
olde)))
;*---------------------------------------------------------------------*/
;* engine-format? ... */
;*---------------------------------------------------------------------*/
(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 (instantiate::%engine
(ident ident)
(version version)
(format format)
(filter filter)
(delegate delegate)
(symbol-table symbol-table)
(customs 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 ((e (duplicate::%engine e
(ident ident)
(version version)
(filter (or filter (%engine-filter e)))
(delegate (or delegate (%engine-delegate e)))
(symbol-table (or symbol-table (%engine-symbol-table e)))
(customs (or custom (%engine-customs e))))))
(set! *engines* (cons e *engines*))
e))
;*---------------------------------------------------------------------*/
;* find-loaded-engine ... */
;*---------------------------------------------------------------------*/
(define (find-loaded-engine id version)
(let loop ((es *engines*))
(cond
((null? es)
#f)
((eq? (%engine-ident (car es)) id)
(cond
((eq? version #unspecified)
(car es))
((eq? version (%engine-version (car es)))
(car es))
(else
(loop (cdr es)))))
(else
(loop (cdr es))))))
;*---------------------------------------------------------------------*/
;* find-engine ... */
;*---------------------------------------------------------------------*/
(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 (pair? c) (string? (cdr c)))
(begin
(skribe-load (cdr c) :engine 'base)
(find-loaded-engine id version))
#f)))))
;*---------------------------------------------------------------------*/
;* engine-custom ... */
;*---------------------------------------------------------------------*/
(define (engine-custom e id)
(with-access::%engine e (customs)
(let ((c (assq id customs)))
(if (pair? c)
(cadr c)
#unspecified))))
;*---------------------------------------------------------------------*/
;* engine-custom-set! ... */
;*---------------------------------------------------------------------*/
(define (engine-custom-set! e id val)
(with-access::%engine e (customs)
(let ((c (assq id customs)))
(if (pair? c)
(set-car! (cdr c) val)
(set! customs (cons (list id val) customs))))))
;*---------------------------------------------------------------------*/
;* engine-add-writer! ... */
;*---------------------------------------------------------------------*/
(define (engine-add-writer! e id pred upred opt before action after class va)
;; check the arity of a procedure
(define (check-procedure name proc arity)
(cond
((not (procedure? proc))
(skribe-error id "Illegal procedure" proc))
((not (correct-arity? proc arity))
(skribe-error id
(string-append "Illegal `" name "'procedure")
proc))))
(define (check-output name proc)
(and proc (or (string? proc) (check-procedure name proc 2))))
;; check the engine
(if (not (engine? e))
(skribe-error id "Illegal engine" e))
;; check the options
(if (not (or (eq? opt 'all) (list? opt)))
(skribe-error id "Illegal options" opt))
;; check the correctness of the predicate and the validator
(check-procedure "predicate" pred 2)
(when va (check-procedure "validate" va 2))
;; check the correctness of the three actions
(check-output "before" before)
(check-output "action" action)
(check-output "after" after)
;; create a new writer...
(let ((n (instantiate::%writer
(ident (if (symbol? id) id 'all))
(class class)
(pred pred)
(upred upred)
(options opt)
(before before)
(action action)
(after after)
(validate va))))
;; ...and bind it
(with-access::%engine e (writers)
(set! writers (cons n writers))
n)))
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