@@ -22,13 +22,14 @@ (define-module (guix read-print)
#:use-module (ice-9 rdelim)
#:use-module (ice-9 vlist)
#:use-module (srfi srfi-1)
- #:use-module (srfi srfi-9)
#:use-module (srfi srfi-34)
#:use-module (srfi srfi-35)
#:export (pretty-print-with-comments
read-with-comments
object->string*
+ blank?
+
comment
comment?
comment->string
@@ -47,12 +48,26 @@ (define-module (guix read-print)
;;; Comment-preserving reader.
;;;
-;; A comment.
-(define-record-type <comment>
- (string->comment str margin?)
- comment?
- (str comment->string)
- (margin? comment-margin?))
+(define <blank>
+ ;; The parent class for "blanks".
+ (make-record-type '<blank> '()
+ (lambda (obj port)
+ (format port "#<blank ~a>"
+ (number->string (object-address obj) 16)))
+ #:extensible? #t))
+
+(define blank? (record-predicate <blank>))
+
+(define <comment>
+ ;; Comments.
+ (make-record-type '<comment> '(str margin?)
+ #:parent <blank>
+ #:extensible? #f))
+
+(define comment? (record-predicate <comment>))
+(define string->comment (record-type-constructor <comment>))
+(define comment->string (record-accessor <comment> 'str))
+(define comment-margin? (record-accessor <comment> 'margin?))
(define* (comment str #:optional margin?)
"Return a new comment made from STR. When MARGIN? is true, return a margin
@@ -66,7 +81,7 @@ (define* (comment str #:optional margin?)
(string->comment str margin?))
(define (read-with-comments port)
- "Like 'read', but include <comment> objects when they're encountered."
+ "Like 'read', but include <blank> objects when they're encountered."
;; Note: Instead of implementing this functionality in 'read' proper, which
;; is the best approach long-term, this code is a layer on top of 'read',
;; such that we don't have to rely on a specific Guile version.
@@ -99,7 +114,7 @@ (define (reverse/dot lst)
(let/ec return
(let liip ((lst '()))
(liip (cons (loop (match lst
- (((? comment?) . _) #t)
+ (((? blank?) . _) #t)
(_ #f))
(lambda ()
(return (reverse/dot lst))))
@@ -327,7 +342,7 @@ (define newline?
(and (keyword? item)
(not (eq? item #:allow-other-keys))))
(not first?) (not delimited?)
- (not (comment? item))))
+ (not (blank? item))))
(when newline?
(newline port)
@@ -335,7 +350,7 @@ (define newline?
(let ((column (if newline? indent column)))
(print tail
(keyword? item) ;keep #:key value next to one another
- (comment? item)
+ (blank? item)
(loop indent column
(or newline? delimited?)
context
@@ -108,7 +108,7 @@ (define (simplify-expressions exp inputs return)
(exp exp)
(inputs inputs))
(match exp
- (((? comment? head) . rest)
+ (((? blank? head) . rest)
(loop (cons head result) rest inputs))
((head . rest)
(match inputs