Changeset 25498 in project

Timestamp:

11/12/11 02:13:43 (10 years ago)

Author:

svnwiki

Message:

Anonymous wiki edit for IP [70.71.179.201]: Use emscript instead

File:

• wiki/emacs-multi-mode (modified) (1 diff)

wiki/emacs-multi-mode

@@ -1 +1 @@
 This script will switch between scheme-mode and c-mode in Emacs, using the #> .. <# and <<ENDC .. ENDC delimiters.
 
-<script src="https://gist.github.com/1359838.js?file=scheme-c-mode.el"></script>
+<enscript highlight="elisp">
+(require 'multi-mode)
+
+(defun scheme-c-mode ()
+  "Mode for editing C embedded in Scheme, using multi-mode."
+  (interactive)
+  (set (make-local-variable 'multi-alist)
+       '((scheme-mode)
+         (c-mode . scheme-c-header-region)
+         (c-mode . scheme-c-inline-region)))
+  (multi-mode-install-modes))
+
+(defun scheme-c-header-region (pos)
+  "Mode-selecting function for C embedded in Scheme."
+  (let ((case-fold-search t)
+        foreign-start foreign-end next-foreign)
+    (save-excursion
+      (save-restriction
+        (widen)
+        (goto-char pos)
+        (save-excursion
+          (let* ((p1 (save-excursion
+                       ;; Check whether we're on the processing
+                       ;; instruction start.  Skip definitely clear of
+                       ;; it and then search backwards.
+                       (goto-char (min (point-max) (+ (point) 2)))
+                       (search-backward "#>" (- (point) 3) t)))
+                 (match-end (if p1 (match-end 0)))
+                 ;; Otherwise search backwards simply.
+                 (p2 (unless p1 (search-backward "#>" nil t))))
+            (if p2 (setq match-end (match-end 0)))
+            (setq foreign-start (or p1 p2))
+            ;; Ready to search for matching terminator or next
+            ;; processing instruction.
+            (goto-char (or match-end pos)))
+          (if foreign-start
+              ;; Look forward for the FOREIGN terminator.
+              (let* ((p1 (save-excursion
+                           ;; Check whether we're on the terminator.
+                           (backward-char 1)
+                           (search-backward "<#" (- (point) 2) t)))
+                     (p2 (unless p1 (search-forward "<#" nil t))))
+                (setq foreign-end (or p1 p2 (point-max)))
+                (goto-char pos)))
+          (if (and foreign-start foreign-end (< pos foreign-end))
+              ;; We were between FOREIGN start and terminator.
+              (list 'c-mode foreign-start foreign-end)
+            ;; Otherwise, look forward for a FOREIGN to delimit the Scheme
+            ;; region.
+            (setq next-foreign 
+                  (if (search-forward "#>" nil t)
+                      (match-beginning 0)
+                    (point-max)))
+            (if foreign-start
+                (list 'scheme-mode (or foreign-end (point-min)) next-foreign)
+              (list 'scheme-mode (point-min) next-foreign))))))))
+
+(defun scheme-c-inline-region (pos)
+  "Mode-selecting function for C embedded in Scheme."
+  (let ((case-fold-search t)
+        foreign-start foreign-end next-foreign)
+    (save-excursion
+      (save-restriction
+        (widen)
+        (goto-char pos)
+        (save-excursion
+          (let* ((p1 (save-excursion
+                       ;; Check whether we're on the processing
+                       ;; instruction start.  Skip definitely clear of
+                       ;; it and then search backwards.
+                       (goto-char (min (point-max) (+ (point) 6)))
+                       (search-backward "<<ENDC" (- (point) 11) t)))
+                 (match-end (if p1 (match-end 0)))
+                 ;; Otherwise search backwards simply.
+                 (p2 (unless p1 (search-backward "<<ENDC" nil t))))
+            (if p2 (setq match-end (match-end 0)))
+            (setq foreign-start (or p1 p2))
+            ;; Ready to search for matching terminator or next
+            ;; processing instruction.
+            (goto-char (or match-end pos)))
+          (if foreign-start
+              ;; Look forward for the FOREIGN terminator.
+              (let* ((p1 (save-excursion
+                           ;; Check whether we're on the terminator.
+                           (backward-char 1)
+                           (search-backward "ENDC" (- (point) 4) t)))
+                     (p2 (unless p1 (search-forward "ENDC" nil t))))
+                (setq foreign-end (or p1 p2 (point-max)))
+                (goto-char pos)))
+          (if (and foreign-start foreign-end (< pos foreign-end))
+              ;; We were between FOREIGN start and terminator.
+              (list 'c-mode foreign-start foreign-end)
+            ;; Otherwise, look forward for a FOREIGN to delimit the Scheme
+            ;; region.
+            (setq next-foreign 
+                  (if (search-forward "<<ENDC" nil t)
+                      (match-beginning 0)
+                    (point-max)))
+            (if foreign-start
+                (list 'scheme-mode (or foreign-end (point-min)) next-foreign)
+              (list 'scheme-mode (point-min) next-foreign))))))))
+
+(provide 'scheme-c-mode)
+</enscript>