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* module/language/ghil.scm (unparse-ghil): Fix unparsing of quasiquoted expressions. * module/language/ghil/spec.scm (join): Define a joiner for GHIL. * module/language/scheme/compile-ghil.scm (cenv-ghil-env): Expand the definition of a CENV so it can have an actual ghil-env, if available. (compile-ghil): Return the actual ghil env in the cenv. * module/system/base/compile.scm (compile-file): Rewrite. `output-file' is now a keyword argument, along with the new kwargs `env' and `from'. We now allow exceptions to propagate up, and instead of printing the output file to the console, we return a string corresponding to its location. (compile-and-load): Use read-and-compile. (compile-fold): Thread around the cenv as well. Return all three values. (find-language-joint, read-and-compile): New exciting helpers. The idea is that compiling a file should be semantically equivalent to compiling each expression in it, one by one. Compilation can have side effects, e.g. affecting the current language or the current reader. So what we do is find a point in the compilation path at which different expressions of a given language can be joined into one. Expressions from the source language are compiled to the joint language, then joined and compiled to the target. (compile): Just return the first value from compile-fold. * module/system/base/language.scm (language-joiner): New optional field. * scripts/compile: Rework for changes to compile-file.
100 lines
3.2 KiB
Scheme
100 lines
3.2 KiB
Scheme
;;; Multi-language support
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;; Copyright (C) 2001 Free Software Foundation, Inc.
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;; This program is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;;
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;;
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;; You should have received a copy of the GNU General Public License
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;; along with this program; see the file COPYING. If not, write to
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;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Code:
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(define-module (system base language)
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#:use-module (system base syntax)
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#:export (define-language language? lookup-language make-language
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language-name language-title language-version language-reader
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language-printer language-parser language-read-file
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language-compilers language-decompilers language-evaluator
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language-joiner
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lookup-compilation-order lookup-decompilation-order
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invalidate-compilation-cache!))
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;;;
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;;; Language class
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;;;
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(define-record/keywords <language>
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name
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title
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version
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reader
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printer
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(parser #f)
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(read-file #f)
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(compilers '())
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(decompilers '())
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(evaluator #f)
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(joiner #f))
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(define-macro (define-language name . spec)
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`(begin
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(invalidate-compilation-cache!)
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(define ,name (make-language #:name ',name ,@spec))))
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(define (lookup-language name)
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(let ((m (resolve-module `(language ,name spec))))
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(if (module-bound? m name)
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(module-ref m name)
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(error "no such language" name))))
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(define *compilation-cache* '())
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(define *decompilation-cache* '())
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(define (invalidate-compilation-cache!)
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(set! *decompilation-cache* '())
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(set! *compilation-cache* '()))
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(define (compute-translation-order from to language-translators)
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(cond
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((not (language? to))
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(compute-translation-order from (lookup-language to) language-translators))
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(else
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(let lp ((from from) (seen '()))
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(cond
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((not (language? from))
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(lp (lookup-language from) seen))
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((eq? from to) (reverse! seen))
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((memq from seen) #f)
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(else (or-map (lambda (pair)
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(lp (car pair) (acons from (cdr pair) seen)))
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(language-translators from))))))))
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(define (lookup-compilation-order from to)
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(let ((key (cons from to)))
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(or (assoc-ref *compilation-cache* key)
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(let ((order (compute-translation-order from to language-compilers)))
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(set! *compilation-cache*
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(acons key order *compilation-cache*))
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order))))
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(define (lookup-decompilation-order from to)
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(let ((key (cons from to)))
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(or (assoc-ref *decompilation-cache* key)
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;; trickery!
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(let ((order (and=>
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(compute-translation-order to from language-decompilers)
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reverse!)))
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(set! *decompilation-cache* (acons key order *decompilation-cache*))
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order))))
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