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utils: 'edit-expression' copies part of the original source map.

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* guix/utils.scm (source-location-key/stamp): New procedure.
(go-to-location): Use it.
(move-source-location-map!): New procedure.
(edit-expression): Call it.
This commit is contained in:
Ludovic Courtès 2021-06-21 16:13:35 +02:00
parent f05433f208
commit 73b08ad1a3
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1 changed files with 32 additions and 5 deletions
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37
guix/utils.scm
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@ -34,6 +34,7 @@ (define-module (guix utils)
#:use-module (srfi srfi-11)
#:use-module (srfi srfi-26)
#:use-module (srfi srfi-39)
#:use-module (srfi srfi-71)
#:use-module (ice-9 ftw)
#:use-module (rnrs io ports) ;need 'port-position' etc.
#:use-module ((rnrs bytevectors) #:select (bytevector-u8-set!))
@ -344,14 +345,20 @@ (define %source-location-map
;; 'go-to-location'.
(make-hash-table))
(define (go-to-location port line column)
(define (source-location-key/stamp stat)
"Return two values: the key for STAT in %SOURCE-LOCATION-MAP, and a stamp
used to invalidate corresponding entries."
(let ((key (list (stat:ino stat) (stat:dev stat)))
(stamp (list (stat:mtime stat) (stat:mtimensec stat)
(stat:size stat))))
(values key stamp)))
(define* (go-to-location port line column)
"Jump to LINE and COLUMN (both one-indexed) in PORT. Maintain a source
location map such that this can boil down to seek(2) and a few read(2) calls,
which can drastically speed up repetitive operations on large files."
(let* ((stat (stat port))
(key (list (stat:ino stat) (stat:dev stat)))
(stamp (list (stat:mtime stat) (stat:mtimensec stat)
(stat:size stat)))
(key stamp (source-location-key/stamp stat))
;; Look for an up-to-date source map for KEY. The map is a vlist
;; where each entry gives the byte offset of the beginning of a line:
@ -398,6 +405,20 @@ (define (go-to-location port line column)
(set-port-line! port (- line 1))
(set-port-column! port (- column 1))))
(define (move-source-location-map! source target line)
"Move the source location map from SOURCE up to LINE to TARGET. SOURCE and
TARGET must be stat buffers as returned by 'stat'."
(let* ((source-key (source-location-key/stamp source))
(target-key target-stamp (source-location-key/stamp target)))
(match (hash-ref %source-location-map source-key)
(#f #t)
((_ ... source-map)
;; Strip the source map and update the associated stamp.
(let ((source-map (vlist-take source-map (max line 1))))
(hash-remove! %source-location-map source-key)
(hash-set! %source-location-map target-key
`(,@target-stamp ,source-map)))))))
(define* (edit-expression source-properties proc #:key (encoding "UTF-8"))
"Edit the expression specified by SOURCE-PROPERTIES using PROC, which should
be a procedure that takes the original expression in string and returns a new
@ -435,7 +456,13 @@ (define column (assq-ref source-properties 'column))
;; post-bv maybe the end-of-file object.
(when (not (eof-object? post-bv))
(put-bytevector out post-bv))
#t)))))))))
#t))
;; Due to 'with-atomic-file-output', IN and FILE no longer share
;; the same inode, but we can reassign the source map up to LINE
;; to the new file.
(move-source-location-map! (stat in) (stat file)
(+ 1 line)))))))))
;;;