[nongnu] elpa/markdown-mode 8f6974ee0e 1/4: Support plus sign and Unicode minus sign

[ELPA Syncer]

branch: elpa/markdown-mode
commit 8f6974ee0ebf4dec7a9f5246b7395b0aec014594
Author: Shohei YOSHIDA <syohex@gmail.com>
Commit: Shohei YOSHIDA <syohex@gmail.com>

    Support plus sign and Unicode minus sign
---
 CHANGES.md             |  2 +-
 markdown-mode.el       |  2 +-
 tests/markdown-test.el | 17 +++++++++++++++--
 3 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/CHANGES.md b/CHANGES.md
index 1de421a5c1..d94d9352d3 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -48,7 +48,7 @@
     -   Auto set `sh-shell` when `markdown-edit-code-block` enter indirect 
buffer with `sh-mode`
     -   Add value check and avoid raising the exception at 
`markdown-edit-code-block` [GH-663][]
     -   Add NonGNU ELPA badge to README and website
-    -   Support negative exponent in super script [GH-346][]
+    -   Support plus/negative(also Unicode minus sign) exponent in super 
script [GH-346][]
 
 *   Bug fixes:
     -   Fix issue with `nil` being returned from 
`markdown-imenu-create-nested-index` [GH-578][]
diff --git a/markdown-mode.el b/markdown-mode.el
index 119aec3be9..009eed31c9 100644
--- a/markdown-mode.el
+++ b/markdown-mode.el
@@ -995,7 +995,7 @@ Compatible with Pandoc, Python Markdown, PHP Markdown 
Extra, and Leanpub.")
   "Regular expression for Leanpub section markers and related syntax.")
 
 (defconst markdown-regex-sub-superscript
-  
"\\(?:^\\|[^\\~^]\\)\\(?1:\\(?2:[~^]\\)\\(?3:[-]?[[:alnum:]]+\\)\\(?4:\\2\\)\\)"
+  
"\\(?:^\\|[^\\~^]\\)\\(?1:\\(?2:[~^]\\)\\(?3:[+-\u2212]?[[:alnum:]]+\\)\\(?4:\\2\\)\\)"
   "The regular expression matching a sub- or superscript.
 The leading un-numbered group matches the character before the
 opening tilde or carat, if any, ensuring that it is not a
diff --git a/tests/markdown-test.el b/tests/markdown-test.el
index 6042cea2e6..097780d6fd 100644
--- a/tests/markdown-test.el
+++ b/tests/markdown-test.el
@@ -3337,11 +3337,24 @@ takes precedence)."
     (markdown-test-range-has-face 4 4 'markdown-markup-face) ; First ^
     (markdown-test-range-has-face 5 6 nil) ; 10
     (markdown-test-range-has-face 7 7 'markdown-markup-face)) ; Second ^
-  (markdown-test-string "1.0 x 10^-15^"
+  (markdown-test-string "1.0 x 10^-15^
+10^+15^"
+    ;; -
     (markdown-test-range-has-face 1 8 nil)
     (markdown-test-range-has-face 9 9 'markdown-markup-face)
     (markdown-test-range-has-face 10 12 nil)
-    (markdown-test-range-has-face 13 13 'markdown-markup-face)))
+    (markdown-test-range-has-face 13 13 'markdown-markup-face)
+    ;; +
+    (markdown-test-range-has-face 15 16 nil)
+    (markdown-test-range-has-face 17 17 'markdown-markup-face)
+    (markdown-test-range-has-face 18 20 nil)
+    (markdown-test-range-has-face 21 21 'markdown-markup-face))
+  ;; Unicode minus sign
+  (markdown-test-string "10^−15^" ;; unicode minus sign U+2212
+    (search-forward "^")
+    (markdown-test-range-has-face (1- (point)) (1- (point)) 
'markdown-markup-face)
+    (search-forward "^")
+    (markdown-test-range-has-face (1- (point)) (1- (point)) 
'markdown-markup-face)))
 
 (ert-deftest test-markdown-font-lock/hidden-urls-inline ()
   "Test URL hiding and toggling."