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;;; lib.scm -- Utilities. -*- coding: iso-8859-1 -*-
;;;
;;; Copyright 2005, 2007, 2009, 2012, 2013, 2016, 2020 Ludovic Court�s <ludo@gnu.org>
;;; Copyright 2003, 2004 Erick Gallesio - I3S-CNRS/ESSI <eg@unice.fr>
;;;
;;;
;;; This file is part of Skribilo.
;;;
;;; Skribilo 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 3 of the License, or
;;; (at your option) any later version.
;;;
;;; Skribilo 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 Skribilo. If not, see <http://www.gnu.org/licenses/>.
(define-module (skribilo lib)
#:use-module (skribilo utils syntax)
#:export (skribe-ast-error skribe-error
skribe-type-error
warning/loc
skribe-warning
skribe-warning/ast
skribe-message
type-name
new define-markup define-simple-markup
define-simple-container define-processor-markup
&invocation-location)
;; Re-exported because used in `define-markup'.
#:re-export (invocation-location)
#:use-module (skribilo ast)
;; useful for `new' to work well with <language>
#:autoload (skribilo source) (<language>)
#:use-module (skribilo parameters)
#:use-module (skribilo location)
#:use-module (srfi srfi-1)
#:use-module (oop goops))
(skribilo-module-syntax)
;;;
;;; NEW
;;;
(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 '>)))
`((@ (oop goops) make) (@@ (skribilo lib) ,class-name)
,@(concatenate (map (lambda (x)
`(,(symbol->keyword (car x)) ,(cadr x)))
parameters)))))
;;;
;;; DEFINE-MARKUP
;;;
(define (dsssl->guile-formals args)
;; When using `(ice-9 optargs)', the `:rest' argument can only appear last,
;; which is not what Skribe/DSSSL expect'. In addition, all keyword
;; arguments are allowed (hence `:allow-other-keys'); they are then checked
;; by `verify'. This procedure shuffles ARGS accordingly.
(let loop ((args args)
(result '())
(rest-arg '())
(has-keywords? #f))
(cond ((null? args)
(let ((result (if has-keywords?
(cons :allow-other-keys result)
result)))
(append (reverse result) rest-arg)))
((list? args)
(let ((is-rest-arg? (eq? (car args) :rest))
(is-keyword? (eq? (car args) :key)))
(if is-rest-arg?
(loop (cddr args)
result
(list (car args) (cadr args))
(or has-keywords? is-keyword?))
(loop (cdr args)
(cons (car args) result)
rest-arg
(or has-keywords? is-keyword?)))))
((pair? args)
(loop '()
(cons (car args) result)
(list :rest (cdr args))
has-keywords?)))))
;; `define-markup' is similar to Guile's `lambda*', with DSSSL
;; keyword style, and a couple other differences handled by
;; `dsssl->guile-formals'.
;; On Guile 2.0, `define-markup' generates a macro for the markup, such
;; that the macro captures its invocation source location using
;; `current-source-location'.
(define-syntax-parameter &invocation-location
(identifier-syntax #f))
(define-syntax define-markup
(lambda (s)
(syntax-case s ()
;; Note: Use a dotted pair for formals, to allow for dotted forms
;; like: `(define-markup (foo x . rest) ...)'.
((_ (name . formals) body ...)
(let ((formals (map (lambda (s)
(datum->syntax #'formals s))
(dsssl->guile-formals (syntax->datum #'formals))))
(internal (symbol-append '% (syntax->datum #'name)
'-internal)))
(with-syntax ((internal/loc (datum->syntax #'name internal)))
#`(begin
(define* (internal/loc loc #,@formals)
(syntax-parameterize ((&invocation-location
(identifier-syntax loc)))
body ...))
(define-syntax name
(lambda (s)
(syntax-case s ()
((_ . args)
#'(let ((loc (source-properties->location
(current-source-location))))
(internal/loc loc . args)))
(_
#'(lambda args
(let ((loc (source-properties->location
(current-source-location))))
(apply internal/loc loc args)))))))
internal/loc ; mark it as used
(export name))))))))
;;;
;;; 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 (or loc &invocation-location))
(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 (or loc &invocation-location))
(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 :key loc)
(new processor
(loc (or loc &invocation-location))
(engine (find-engine ',proc))
(body (the-body opts))
(options (the-options opts)))))
;;;
;;; TYPE-NAME
;;;
(define (type-name obj)
(cond ((string? obj) "string")
((ast? obj) "ast")
((list? obj) "list")
((pair? obj) "pair")
((number? obj) "number")
((char? obj) "character")
((keyword? obj) "keyword")
(else (with-output-to-string
(lambda () (write obj))))))
;;;
;;; 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 #f "~a ~s (~a expected)" msg obj etype) #f))
;;;
;;; SKRIBE-WARNING & SKRIBE-WARNING/AST
;;;
(define (%skribe-warn level file line col lst)
(let ((port (current-error-port)))
(when (and file line col)
(format port "~a:~a:~a: " file line col))
(display "warning: " port)
(for-each (lambda (x) (format port "~a " x)) lst)
(newline port)))
(define (skribe-warning level . obj)
(if (>= (*warning*) level)
(%skribe-warn level #f #f #f obj)))
(define (warning/loc level loc . obj)
(if (>= (*warning*) level)
(if (location? loc)
(%skribe-warn level (location-file loc) (location-line loc)
(location-column loc) obj)
(%skribe-warn level #f #f #f obj))))
(define (skribe-warning/ast level ast . obj)
(apply warning/loc level
(and (ast? ast) (ast-location ast))
obj))
;;;
;;; SKRIBE-MESSAGE
;;;
(define (skribe-message fmt . obj)
(when (> (*verbose*) 0)
(apply format (current-error-port) fmt obj)))
;;; lib.scm ends here
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