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;;; Copyright (C) 2025 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 program. If not, see
;;; <http://www.gnu.org/licenses/>.
;;; Commentary:
;;;
;;; Code:
(define-module (ice-9 source-properties)
#:use-module (ice-9 weak-tables)
#:use-module (system syntax internal)
#:use-module (ice-9 match)
;; FIXME: Change to #:export when deprecated bindings removed.
#:replace (supports-source-properties?
source-property
set-source-property!
source-properties
set-source-properties!
read))
(define global-source-properties (make-weak-key-hash-table))
(define (immediate? x)
(cond
((exact-integer? x) (<= most-negative-fixnum x most-positive-fixnum))
((char? x) #t)
((eq? x #f) #t)
((eq? x #nil) #t)
((eq? x '()) #t)
((eq? x #t) #t)
((unspecified? x) #t)
((eof-object? x) #t)
(else #f)))
(define (supports-source-properties? x)
(cond
((immediate? x) #f)
((symbol? x) #f)
((keyword? x) #f)
(else #t)))
(define (source-properties obj)
(if (supports-source-properties? obj)
(weak-key-hash-table-ref global-source-properties obj
#:default (lambda (k) '()))
'()))
(define (set-source-properties! obj props)
(unless (supports-source-properties? obj)
(scm-error 'wrong-type-arg "set-source-properties!"
"Unexpected immediate value: ~S"
(list obj) #f))
(weak-key-hash-table-set! global-source-properties obj props))
(define (source-property obj key)
(and (supports-source-properties? obj)
(assq-ref (source-properties obj) key)))
(define (set-source-property! obj key value)
(unless (supports-source-properties? obj)
(scm-error 'wrong-type-arg "set-source-properties!"
"Unexpected immediate value: ~S"
(list obj) #f))
(set-source-properties! obj (assq-set! (source-properties obj) key value)))
(define (cons-source orig x y)
(let ((pair (cons x y))
(src (source-properties orig)))
(when (pair? src)
(set-source-properties! pair src))
pair))
(define* (read #:optional (port (current-input-port)))
(define (annotate x src)
(when (supports-source-properties? x)
(match src
(#(filename line column)
(set-source-properties! x `((filename . ,filename)
(line . ,line)
(column . ,column))))
(#f (values))))
x)
(define (strip-and-annotate x)
(cond
((syntax? x)
(annotate (strip-and-annotate (syntax-expression x))
(syntax-source x)))
((pair? x)
(cons (strip-and-annotate (car x))
(strip-and-annotate (cdr x))))
((vector? x)
(list->vector (map strip-and-annotate (vector->list x))))
(else
x)))
(strip-and-annotate (read-syntax port)))
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