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Diffstat (limited to 'src/bigloo/engine.scm')
| -rw-r--r-- | src/bigloo/engine.scm | 262 |
1 files changed, 262 insertions, 0 deletions
diff --git a/src/bigloo/engine.scm b/src/bigloo/engine.scm new file mode 100644 index 0000000..bd8a027 --- /dev/null +++ b/src/bigloo/engine.scm @@ -0,0 +1,262 @@ +;*=====================================================================*/ +;* 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))) |