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;;; Multi-language support
;; Copyright (C) 2001,2005,2008-2011,2013,2020 Free Software Foundation, Inc.
;; This library is free software; you can redistribute it and/or
;; modify it under the terms of the GNU Lesser General Public
;; License as published by the Free Software Foundation; either
;; version 3 of the License, or (at your option) any later version.
;;
;; This library 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
;; Lesser General Public License for more details.
;;
;; You should have received a copy of the GNU Lesser General Public
;; License along with this library; if not, write to the Free Software
;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
;; 02110-1301 USA
;;; Code:
(define-module (system base language)
#:use-module (system base syntax)
#:export (define-language language? lookup-language make-language
language-name language-title language-reader
language-printer language-parser
language-compilers language-decompilers language-evaluator
language-joiner language-for-humans?
language-make-default-environment
language-lowerer language-analyzer
language-compiler-chooser
lookup-compilation-order lookup-decompilation-order
default-environment)
#:re-export (current-language))
;;;
;;; Language class
;;;
(define-record/keywords <language>
name
title
reader
printer
(parser #f)
(compilers '())
(decompilers '())
(evaluator #f)
(joiner #f)
(for-humans? #t)
(make-default-environment make-fresh-user-module)
(lowerer #f)
(analyzer #f)
(compiler-chooser #f))
(define-syntax-rule (define-language name . spec)
(define name (make-language #:name 'name . spec)))
(define (lookup-language name)
(let ((m (resolve-module `(language ,name spec))))
(if (module-bound? m name)
(module-ref m name)
(error "no such language" name))))
(begin-deprecated
(define-public (invalidate-compilation-cache!)
(issue-deprecation-warning
"invalidate-compilation-cache is deprecated; recompile your modules")
(values)))
(define (compute-translation-order from to language-translators)
(cond
((not (language? to))
(compute-translation-order from (lookup-language to) language-translators))
(else
(let lp ((from from) (seen '()))
(cond
((not (language? from))
(lp (lookup-language from) seen))
((eq? from to) (reverse! seen))
((memq from seen) #f)
(else (or-map (lambda (pair)
(lp (car pair) (acons from (cdr pair) seen)))
(language-translators from))))))))
(define (lookup-compilation-order from to)
(compute-translation-order from to language-compilers))
(define (lookup-decompilation-order from to)
(and=> (compute-translation-order to from language-decompilers)
reverse!))
(define (default-environment lang)
"Return the default compilation environment for source language LANG."
((language-make-default-environment
(if (language? lang) lang (lookup-language lang)))))
;;;
;;; Current language
;;;
;; Deprecated; use current-language instead.
(begin-deprecated
(define-public *current-language* (parameter-fluid current-language)))
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