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;;; -*- mode: scheme; coding: utf-8; -*-
;;;
;;; Copyright (C) 2009, 2010, 2011, 2012, 2013, 2021 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
(use-modules (language tree-il)
(language tree-il primitives)
(srfi srfi-1)
(ice-9 control)
(ice-9 pretty-print)
(system syntax internal))
;; Minimize a syntax-object such that it can no longer be used as the
;; first argument to 'datum->syntax', but is otherwise equivalent.
(define (squeeze-syntax-object syn)
(define (ensure-list x) (if (vector? x) (vector->list x) x))
(let ((x (syntax-expression syn))
(wrap (syntax-wrap syn))
(mod (syntax-module syn)))
(let ((marks (car wrap))
(subst (cdr wrap)))
(define (squeeze-wrap marks subst)
(make-syntax x (cons marks subst) mod))
(cond
((symbol? x)
(let loop ((marks marks) (subst subst))
(cond
((null? subst) (squeeze-wrap marks subst))
((eq? 'shift (car subst)) (loop (cdr marks) (cdr subst)))
((find (lambda (entry) (and (eq? x (car entry))
(equal? marks (cadr entry))))
(apply map list (map ensure-list
(cdr (vector->list (car subst))))))
=> (lambda (entry)
(squeeze-wrap marks
(list (list->vector
(cons 'ribcage
(map vector entry)))))))
(else (loop marks (cdr subst))))))
((or (pair? x) (vector? x)) syn)
(else x)))))
(define (squeeze-constant x)
(cond ((syntax? x) (squeeze-syntax-object x))
((pair? x)
(cons (squeeze-constant (car x))
(squeeze-constant (cdr x))))
((vector? x)
(list->vector (squeeze-constant (vector->list x))))
(else x)))
(define (squeeze-tree-il x)
(post-order (lambda (x)
(if (const? x)
(make-const (const-src x)
(squeeze-constant (const-exp x)))
x))
x))
(define (translate-literal-syntax-objects x)
(define (find-make-syntax-lexical-binding x)
(let/ec return
(pre-order (lambda (x)
(when (let? x)
(for-each (lambda (name sym)
(when (eq? name 'make-syntax)
(return sym)))
(let-names x) (let-gensyms x)))
x)
x)
#f))
(let ((make-syntax-gensym (find-make-syntax-lexical-binding x))
(retry-tag (make-prompt-tag)))
(define (translate-constant x)
(let ((src (const-src x))
(exp (const-exp x)))
(cond
((list? exp)
(let ((exp (map (lambda (x)
(translate-constant (make-const src x)))
exp)))
(if (and-map const? exp)
x
(make-primcall src 'list exp))))
((pair? exp)
(let ((car (translate-constant (make-const src (car exp))))
(cdr (translate-constant (make-const src (cdr exp)))))
(if (and (const? car) (const? cdr))
x
(make-primcall src 'cons (list car cdr)))))
((vector? exp)
(let ((exp (map (lambda (x)
(translate-constant (make-const src x)))
(vector->list exp))))
(if (and-map const? exp)
x
(make-primcall src 'vector exp))))
((syntax? exp)
(make-call src
(if make-syntax-gensym
(make-lexical-ref src 'make-syntax
make-syntax-gensym)
(abort-to-prompt retry-tag))
(list
(translate-constant
(make-const src (syntax-expression exp)))
(translate-constant
(make-const src (syntax-wrap exp)))
(translate-constant
(make-const src (syntax-module exp))))))
(else x))))
(call-with-prompt retry-tag
(lambda ()
(post-order (lambda (x)
(if (const? x)
(translate-constant x)
x))
x))
(lambda (k)
;; OK, we have a syntax object embedded in this code, but
;; make-syntax isn't lexically bound. This is the case for the
;; top-level macro definitions in psyntax that follow the main
;; let blob. Attach a lexical binding and retry.
(unless (toplevel-define? x) (error "unexpected"))
(translate-literal-syntax-objects
(make-toplevel-define
(toplevel-define-src x)
(toplevel-define-mod x)
(toplevel-define-name x)
(make-let (toplevel-define-src x)
(list 'make-syntax)
(list (module-gensym))
(list (make-toplevel-ref #f #f 'make-syntax))
(toplevel-define-exp x))))))))
;; Avoid gratuitous churn in psyntax-pp.scm due to the marks and labels
;; changing session identifiers.
(set! syntax-session-id (lambda () "*"))
(let ((source (list-ref (command-line) 1))
(target (list-ref (command-line) 2)))
(let ((in (open-input-file source))
(out (open-output-file (string-append target ".tmp"))))
(write '(eval-when (compile) (set-current-module (resolve-module '(guile))))
out)
(newline out)
(let loop ((x (read in)))
(if (eof-object? x)
(begin
(close-port out)
(close-port in))
(begin
(pretty-print (tree-il->scheme
(translate-literal-syntax-objects
(squeeze-tree-il
(resolve-primitives
(macroexpand x 'c '(compile load eval))
(current-module))))
(current-module)
(list #:avoid-lambda? #f
#:use-case? #f
#:strip-numeric-suffixes? #t
#:use-derived-syntax?
(and (pair? x)
(eq? 'let (car x)))))
out #:width 120 #:max-expr-width 70)
(newline out)
(loop (read in))))))
(system (format #f "mv -f ~s.tmp ~s" target target)))
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