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|
;;;
;;; lib.scm -- Utilities
;;;
;;; Copyright � 2003-2004 Erick Gallesio - I3S-CNRS/ESSI <eg@unice.fr>
;;; Copyright � 2005 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
;;; USA.
(define-module (skribilo lib)
:use-module (skribilo utils syntax)
:export (skribe-eval-location skribe-ast-error skribe-error
skribe-type-error
skribe-warning skribe-warning/ast
skribe-message
skribe-read
%procedure-arity)
:export-syntax (new define-markup define-simple-markup
define-simple-container define-processor-markup)
:use-module (skribilo config)
:use-module (skribilo ast)
;; useful for `new' to work well with <language>
:autoload (skribilo source) (<language>)
:use-module (skribilo reader)
:use-module (skribilo parameters)
:use-module (skribilo location)
:use-module (srfi srfi-1)
:use-module (oop goops)
:use-module (ice-9 optargs))
(fluid-set! current-reader %skribilo-module-reader)
;;;
;;; NEW
;;;
(define %types-module (current-module))
(define-macro (new class . parameters)
;; Thanks to the trick below, modules don't need to import `(oop goops)'
;; and `(skribilo ast)' in order to make use of `new'.
(let* ((class-name (symbol-append '< class '>))
(actual-class (module-ref %types-module class-name)))
`(let ((make ,make)
(,class-name ,actual-class))
(make ,class-name
,@(apply append (map (lambda (x)
`(,(symbol->keyword (car x)) ,(cadr x)))
parameters))))))
;;;
;;; DEFINE-MARKUP
;;;
(define-macro (define-markup bindings . body)
;; This is just an `(ice-9 optargs)' kind of `lambda*', with DSSSL
;; keyword-style conversion enabled. However, using `(ice-9 optargs)', the
;; `#:rest' argument can only appear last, which is not what Skribe/DSSSL
;; expect, hence `fix-rest-arg'.
(define (fix-rest-arg args)
(let loop ((args args)
(result '())
(rest-arg #f))
(cond ((null? args)
(if rest-arg
(append (reverse result) rest-arg)
(reverse result)))
((list? args)
(let ((is-rest-arg? (eq? (car args) #:rest)))
(loop (if is-rest-arg? (cddr args) (cdr args))
(if is-rest-arg? result (cons (car args) result))
(if is-rest-arg?
(list (car args) (cadr args))
rest-arg))))
((pair? args)
(loop '()
(cons (car args) result)
(list #:rest (cdr args)))))))
(let ((name (car bindings))
(opts (cdr bindings)))
`(define*-public ,(cons name (fix-rest-arg opts)) ,@body)))
;;;
;;; DEFINE-SIMPLE-MARKUP
;;;
(define-macro (define-simple-markup markup)
`(define-markup (,markup :rest opts :key ident class loc)
(new markup
(markup ',markup)
(ident (or ident (symbol->string
(gensym ',(symbol->string markup)))))
(loc loc)
(class class)
(required-options '())
(options (the-options opts :ident :class :loc))
(body (the-body opts)))))
;;;
;;; DEFINE-SIMPLE-CONTAINER
;;;
(define-macro (define-simple-container markup)
`(define-markup (,markup :rest opts :key ident class loc)
(new container
(markup ',markup)
(ident (or ident (symbol->string
(gensym ',(symbol->string markup)))))
(loc loc)
(class class)
(required-options '())
(options (the-options opts :ident :class :loc))
(body (the-body opts)))))
;;;
;;; DEFINE-PROCESSOR-MARKUP
;;;
(define-macro (define-processor-markup proc)
`(define-markup (,proc #:rest opts)
(new processor
(engine (find-engine ',proc))
(body (the-body opts))
(options (the-options opts)))))
;;;
;;; SKRIBE-EVAL-LOCATION ...
;;;
(define (skribe-eval-location)
(format (current-error-port)
"FIXME: ...... SKRIBE-EVAL-LOCATION (should not appear)\n")
#f)
;;;
;;; SKRIBE-ERROR
;;;
(define (skribe-ast-error proc msg obj)
(let ((l (ast-loc obj))
(shape (if (markup? obj) (markup-markup obj) obj)))
(if (location? l)
(error (format #f "~a:~a: ~a: ~a ~s" (location-file l)
(location-line l) proc msg shape))
(error (format #f "~a: ~a ~s " proc msg shape)))))
(define (skribe-error proc msg obj)
(if (ast? obj)
(skribe-ast-error proc msg obj)
(error (format #f "~a: ~a ~s" proc msg obj))))
;;;
;;; SKRIBE-TYPE-ERROR
;;;
(define (skribe-type-error proc msg obj etype)
(skribe-error proc (format "~a ~s (~a expected)" msg obj etype) #f))
;;;
;;; SKRIBE-WARNING & SKRIBE-WARNING/AST
;;;
(define (%skribe-warn level file line lst)
(let ((port (current-error-port)))
(if (or (not file) (not line))
(begin
;; XXX: This is a bit hackish, but it proves to be quite useful.
(set! file (port-filename (current-input-port)))
(set! line (port-line (current-input-port)))))
(when (and file line)
(format port "~a:~a: " file line))
(format port "warning: ")
(for-each (lambda (x) (format port "~a " x)) lst)
(newline port)))
(define (skribe-warning level . obj)
(if (>= (*warning*) level)
(%skribe-warn level #f #f obj)))
(define (skribe-warning/ast level ast . obj)
(if (>= (*warning*) level)
(let ((l (ast-loc ast)))
(if (location? l)
(%skribe-warn level (location-file l) (location-line l) obj)
(%skribe-warn level #f #f obj)))))
;;;
;;; SKRIBE-MESSAGE
;;;
(define (skribe-message fmt . obj)
(when (> (*verbose*) 0)
(apply format (current-error-port) fmt obj)))
;;;
;;; KEY-GET
;;;
;;; We need to redefine the standard key-get to be more permissive. In
;;; STklos key-get accepts a list which is formed only of keywords. In
;;; Skribe, parameter lists are of the form
;;; (:title "..." :option "...." body1 body2 body3)
;;; So is we find an element which is not a keyword, we skip it (unless it
;;; follows a keyword of course). Since the compiler of extended lambda
;;; uses the function key-get, it will now accept Skribe markups
(define* (key-get lst key #:optional (default #f) default?)
(define (not-found)
(if default?
default
(error 'key-get "value ~S not found in list ~S" key lst)))
(let Loop ((l lst))
(cond
((null? l)
(not-found))
((not (pair? l))
(error 'key-get "bad list ~S" lst))
((keyword? (car l))
(if (null? (cdr l))
(error 'key-get "bad keyword list ~S" lst)
(if (eq? (car l) key)
(cadr l)
(Loop (cddr l)))))
(else
(Loop (cdr l))))))
;;;
;;; Various things.
;;;
(define* (skribe-read #:optional (port (current-input-port)))
(%skribe-reader port))
(define (%procedure-arity proc)
(car (procedure-property proc 'arity)))
;;; lib.scm ends here
|
