tildify.el: Optimise environments regexes

* lisp/textmodes/tildify.el (tildify-ignored-environments-alist):
Each time beginning of an environment to ignore is found,
`tildify-find-env' needs to identify regexp for the ending
of the environment.  This is done by trying all the opening
regexes on matched text in a loop, so to speed that up, this
loop should have fewer things to match, which can be done by
using alternatives in the opening regexes.

Coincidentally, this should make matching of the opening
regexp faster as well thanks to the use of `regexp-opt' and
having common prefix pulled from many regexes.

1 files changed, 14 insertions, 0 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index f8ed1dced82..1a6b1cd517c 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,5 +1,19 @@
 2014-06-05  Michal Nazarewicz  <mina86@mina86.com>
 
+        * textmodes/tildify.el (tildify-ignored-environments-alist):
+        Optimise environments regexes
+
+        Each time beginning of an environment to ignore is found,
+        `tildify-find-env' needs to identify regexp for the ending
+        of the environment.  This is done by trying all the opening
+        regexes on matched text in a loop, so to speed that up, this
+        loop should have fewer things to match, which can be done by
+        using alternatives in the opening regexes.
+
+        Coincidentally, this should make matching of the opening
+        regexp faster as well thanks to the use of `regexp-opt' and
+        having common prefix pulled from many regexes.
+
         * textmodes/tildify.el (tildify-string-alist)
         (tildify-ignored-environments-alist): Add `nxml-mode' to the list
         of supported modes since `xml-mode' is no longer a thing but just