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escape and indent implemented.

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Zhang Chiyuan 2008-03-03 06:43:15 +00:00
parent f1e60eb3e0
commit 6d81107a96
1 changed files with 74 additions and 5 deletions
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79
yasnippet.el
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@ -24,14 +24,47 @@
(require 'cl)
(defvar yas/snippet-tables (make-hash-table)
"A hash table of snippet tables corresponding to each major-mode.")
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; User customizable variables
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defvar yas/key-syntax "w"
"Syntax of a key. This is used to determine the current key being
expanded.")
(defvar yas/indent-line t
"Each (except the 1st) line of the snippet template is indented to
current column if this variable is non-`nil'.")
(make-variable-buffer-local 'yas/indent-line)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Internal variables
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defvar yas/snippet-tables (make-hash-table)
"A hash table of snippet tables corresponding to each major-mode.")
(defstruct yas/snippet
"The snippet structure of yasnippet."
overlay fields exit-marker)
(defstruct yas/snippet-field
"The snippet-field structure of yasnippet."
overlay state)
(defconst yas/escape-dollar "\\$")
(defconst yas/escape-backquote "\\`")
(defconst yas/escape-dollar-guard
(concat "YASESCAPE" "DOLLAR" "PROTECTGUARD"))
(defconst yas/escape-backquote-guard
(concat "YASESCAPE" "BACKQUOTE" "PROTECTGUARD"))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Internal functions
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defsubst yas/replace-all (from to)
"Replace all occurance from FROM to TO."
(save-excursion
(goto-char (point-min))
(while (search-forward from nil t)
(replace-match to nil t))))
(defun yas/snippet-table (mode)
"Get the snippet table corresponding to MODE."
(let ((table (gethash mode yas/snippet-tables)))
@ -58,18 +91,54 @@ expanded.")
start
end))))
(defun yas/create-snippet (template
indent? column tabify? tab-width)
"Create a snippet according to TEMPLATE. Each line is indented to
current column if `yas/indent-line' is non-`nil'."
(with-temp-buffer
(insert template)
;; Step 1: do necessary indent
(when indent?
(let* ((indent (if tabify?
(concat (make-string (/ column tab-width) ?\t)
(make-string (% column tab-width) ?\ ))
(make-string column ?\ ))))
(goto-char (point-min))
(while (zerop (forward-line))
(insert indent)
(end-of-line))))
;; Step 2: protect escape characters
(yas/replace-all yas/escape-dollar yas/escape-dollar-guard)
(yas/replace-all yas/escape-backquote yas/escape-backquote-guard)
;; Step : restore escape characters
(yas/replace-all yas/escape-dollar-guard yas/escape-dollar)
(yas/replace-all yas/escape-backquote-guard yas/escape-backquote)
(buffer-string)))
(defun yas/expand-snippet (start end template)
"Expand snippet at current point. Text between START and END
will be deleted before inserting template."
(goto-char start)
(insert template)
(insert (yas/create-snippet template
yas/indent-line ; indent?
(current-column) ; column
indent-tabs-mode ; tabify?
tab-width ; tab-width
))
(delete-char (- end start)))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; User level functions
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defun yas/define (mode key template)
"Define a snippet. Expanding KEY into TEMPLATE."
(puthash key template (yas/snippet-table mode)))
(defun yas/expand ()
"Expand a snippet. When a snippet is expanded, t is returned,
otherwise, nil returned."