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Re: [ELPA] New package: cycle-quotes.el

From: Simen Heggestøyl
Subject: Re: [ELPA] New package: cycle-quotes.el
Date: Sat, 11 Jun 2016 19:23:40 +0200

Michael Mauger <address@hidden> writes:
> The functionality you provide is useful, but making it so that mode-specific
> hooks can provide the intelligent details, while your module provides the
> engine for cycling and escaping might be a future direction. 

Michael, Stefan, will something like this provide enough flexibility for

-- Simen

diff --git a/cycle-quotes.el b/cycle-quotes.el
index faac0cb..075ab98 100644
--- a/cycle-quotes.el
+++ b/cycle-quotes.el
@@ -45,9 +45,13 @@ Set the first time `cycle-quotes' is called in a buffer.")
 If this is different from the current mode, the quote chars need
 to be recomputed.")
-(defun cycle-quotes--set-quote-chars ()
-  "Set the quote chars for the current syntax table."
-  (let ((syntax-table (syntax-table)))
+(defun cycle-quotes-quote-chars ()
+  "Return a list of quote characters for the current mode.
+This is the default value of `cycle-quotes-quote-chars-function'.
+It uses the syntax table for the current mode to determine which
+characters should be regarded as quote characters."
+  (let ((syntax-table (syntax-table))
+        (quote-chars '()))
     (while syntax-table
        (lambda (char-code-or-range syntax)
@@ -56,12 +60,50 @@ to be recomputed.")
                (let ((from (car char-code-or-range))
                      (to (cdr char-code-or-range)))
                  (dolist (char-code (number-sequence from to))
-                   (add-to-list 'cycle-quotes--quote-chars char-code)))
-             (add-to-list
-              'cycle-quotes--quote-chars char-code-or-range))))
+                   (add-to-list 'quote-chars char-code)))
+             (add-to-list 'quote-chars char-code-or-range))))
       (setq syntax-table (char-table-parent syntax-table)))
-    (setq-local cycle-quotes--quote-chars-mode major-mode)))
+    quote-chars))
+(defun cycle-quotes-surrounding-quote ()
+  "Return the surrounding quote character if point is inside a string.
+This is the default value of
+  (nth 3 (syntax-ppss)))
+(defun cycle-quotes-forward-string ()
+  "Move point across the string directly after point.
+This is the default value of
+  (forward-sexp)
+  ;; `forward-sexp' fails to jump to the matching quote in some modes,
+  ;; for instance `js2-mode'.
+  (skip-syntax-backward "^\"|"))
+(defvar-local cycle-quotes-quote-chars-function
+  #'cycle-quotes-quote-chars
+  "Function returning quote characters for the current mode.")
+(defvar-local cycle-quotes-surrounding-quote-function
+  #'cycle-quotes-surrounding-quote
+  "Function returning the quote character surrounding point.
+It should return the surrounding quote character if point is
+inside a string.  If not, it should return nil.")
+(defvar-local cycle-quotes-forward-string-function
+  #'cycle-quotes-forward-string
+  "Function moving point across a string directly after point.
+For instance, if this function is called when point is at `★':
+    ★'Let\'s go!'
+Point should end up at the end up after the last quote:
+     'Let\'s go!'★
+Just calling `forward-sexp' should work for most modes, where
+quote characters have been given string quote syntax.")
 (defun cycle-quotes--next-quote-char (char)
   "Return quote char after CHAR."
@@ -93,10 +135,13 @@ character removed."
   "Cycle between string quote styles."
   (unless (eq major-mode cycle-quotes--quote-chars-mode)
-    (cycle-quotes--set-quote-chars))
+    (let ((quote-chars (funcall cycle-quotes-quote-chars-function)))
+      (setq-local cycle-quotes--quote-chars quote-chars))
+    (setq-local cycle-quotes--quote-chars-mode major-mode))
   (if (< (length cycle-quotes--quote-chars) 2)
       (message "The current mode has no alternative quote syntax")
-    (let ((quote-char (nth 3 (syntax-ppss))))
+    (let ((quote-char
+           (funcall cycle-quotes-surrounding-quote-function)))
       (if (not quote-char)
           (message "Not inside a string")
         (let ((inside-generic-string (eq quote-char t))
@@ -127,10 +172,7 @@ character removed."
                      (- (match-end 0) (match-beginning 0)))))
                 (let ((beg (point)))
-                  (forward-sexp)
-                  ;; `forward-sexp' fails to jump to the matching quote
-                  ;; in some modes, for instance `js2-mode'.
-                  (skip-syntax-backward "^\"|")
+                  (funcall cycle-quotes-forward-string-function)
                    (+ beg 1) (+ (point) 1) new-quote-char quote-char))
                 (delete-char (- repeat))

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