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Refactor snippet marker manipulating functions

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* yasnippet.el (yas--snippet-map-markers): New function.
(yas--markers-to-points, yas--points-to-markers
(yas--collect-snippet-markers): Use it.
This commit is contained in:
Noam Postavsky 2016-12-24 14:41:53 -05:00
parent 0311fe2619
commit d0c6fecab5
1 changed files with 31 additions and 57 deletions
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yasnippet.el
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@ -2973,6 +2973,20 @@ ENV is a list of elements with the form (VAR FORM)."
(declare (debug (form body)) (indent 1))
`(eval (cl-list* 'let* ,env ',body)))
(defun yas--snippet-map-markers (fun snippet)
"Apply FUN to all marker (sub)fields in SNIPPET.
Update each field with the result of calling FUN."
(dolist (field (yas--snippet-fields snippet))
(setf (yas--field-start field) (funcall fun (yas--field-start field)))
(setf (yas--field-end field) (funcall fun (yas--field-end field)))
(dolist (mirror (yas--field-mirrors field))
(setf (yas--mirror-start mirror) (funcall fun (yas--mirror-start mirror)))
(setf (yas--mirror-end mirror) (funcall fun (yas--mirror-end mirror)))))
(let ((snippet-exit (yas--snippet-exit snippet)))
(when snippet-exit
(setf (yas--exit-marker snippet-exit)
(funcall fun (yas--exit-marker snippet-exit))))))
(defun yas--apply-transform (field-or-mirror field &optional empty-on-nil-p)
"Calculate transformed string for FIELD-OR-MIRROR from FIELD.
@ -3286,58 +3300,27 @@ If so cleans up the whole snippet up."
;; Apropos markers-to-points:
;;
;; This was found useful for performance reasons, so that an
;; excessive number of live markers aren't kept around in the
;; `buffer-undo-list'. However, in `markers-to-points', the
;; set-to-nil markers can't simply be discarded and replaced with
;; fresh ones in `points-to-markers'. The original marker that was
;; just set to nil has to be reused.
;; This was found useful for performance reasons, so that an excessive
;; number of live markers aren't kept around in the
;; `buffer-undo-list'. We reuse the original marker object, although
;; that's probably not necessary.
;;
;; This shouldn't bring horrible problems with undo/redo, but it
;; you never know
;; This shouldn't bring horrible problems with undo/redo, but you
;; never know.
;;
(defun yas--markers-to-points (snippet)
"Convert all markers in SNIPPET to a cons (POINT . MARKER)
where POINT is the original position of the marker and MARKER is
the original marker object with the position set to nil."
(dolist (field (yas--snippet-fields snippet))
(let ((start (marker-position (yas--field-start field)))
(end (marker-position (yas--field-end field))))
(set-marker (yas--field-start field) nil)
(set-marker (yas--field-end field) nil)
(setf (yas--field-start field) (cons start (yas--field-start field)))
(setf (yas--field-end field) (cons end (yas--field-end field))))
(dolist (mirror (yas--field-mirrors field))
(let ((start (marker-position (yas--mirror-start mirror)))
(end (marker-position (yas--mirror-end mirror))))
(set-marker (yas--mirror-start mirror) nil)
(set-marker (yas--mirror-end mirror) nil)
(setf (yas--mirror-start mirror) (cons start (yas--mirror-start mirror)))
(setf (yas--mirror-end mirror) (cons end (yas--mirror-end mirror))))))
(let ((snippet-exit (yas--snippet-exit snippet)))
(when snippet-exit
(let ((exit (marker-position (yas--exit-marker snippet-exit))))
(set-marker (yas--exit-marker snippet-exit) nil)
(setf (yas--exit-marker snippet-exit) (cons exit (yas--exit-marker snippet-exit)))))))
"Save all markers of SNIPPET as positions."
(yas--snippet-map-markers (lambda (m)
(prog1 (cons (marker-position m) m)
(set-marker m nil)))
snippet))
(defun yas--points-to-markers (snippet)
"Convert all cons (POINT . MARKER) in SNIPPET to markers.
This is done by setting MARKER to POINT with `set-marker'."
(dolist (field (yas--snippet-fields snippet))
(setf (yas--field-start field) (set-marker (cdr (yas--field-start field))
(car (yas--field-start field))))
(setf (yas--field-end field) (set-marker (cdr (yas--field-end field))
(car (yas--field-end field))))
(dolist (mirror (yas--field-mirrors field))
(setf (yas--mirror-start mirror) (set-marker (cdr (yas--mirror-start mirror))
(car (yas--mirror-start mirror))))
(setf (yas--mirror-end mirror) (set-marker (cdr (yas--mirror-end mirror))
(car (yas--mirror-end mirror))))))
(let ((snippet-exit (yas--snippet-exit snippet)))
(when snippet-exit
(setf (yas--exit-marker snippet-exit) (set-marker (cdr (yas--exit-marker snippet-exit))
(car (yas--exit-marker snippet-exit)))))))
"Restore SNIPPET's marker positions, saved by `yas--markers-to-points'."
(yas--snippet-map-markers (lambda (p-m)
(set-marker (cdr p-m) (car p-m))
(cdr p-m))
snippet))
(defun yas--field-contains-point-p (field &optional point)
(let ((point (or point
@ -4033,16 +4016,7 @@ The SNIPPET's markers are preserved."
(defun yas--collect-snippet-markers (snippet)
"Make a list of all the markers used by SNIPPET."
(let (markers)
(dolist (field (yas--snippet-fields snippet))
(push (yas--field-start field) markers)
(push (yas--field-end field) markers)
(dolist (mirror (yas--field-mirrors field))
(push (yas--mirror-start mirror) markers)
(push (yas--mirror-end mirror) markers)))
(let ((snippet-exit (yas--snippet-exit snippet)))
(when (and snippet-exit
(marker-buffer (yas--exit-marker snippet-exit)))
(push (yas--exit-marker snippet-exit) markers)))
(yas--snippet-map-markers (lambda (m) (push m markers) m) snippet)
markers))
(defun yas--escape-string (escaped)