Re: Issues with nested begin..end blocks in inline math environments

[Matt Huszagh <huszaghmatt@gmail.com>]

[-- Attachment #1: Type: text/plain, Size: 185 bytes --]


I'm submitting this as a patch. I've used it on hundreds of latex
fragments over the past week or so and haven't experienced any issues
(which is expected since the change is small).


[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #2: regex-patch --]
[-- Type: text/x-patch, Size: 1457 bytes --]

From a699b699ed4132839c39f1152868bb13364422c7 Mon Sep 17 00:00:00 2001
From: Matt Huszagh <huszaghmatt@gmail.com>
Date: Sat, 14 Dec 2019 19:54:41 -0800
Subject: [PATCH] org-element.el: allow environment blocks in math delimiters

* lisp/org-element.el (org-element--latex-begin-environment): Add a
non-capturing block for `\(' or `$' so that previously recognized
latex environments can also appear within an inline math environment.

* lisp/org-element.el (org-element--latex-end-environment): Match the
begin environment noncapturing block with `$' or `\)'.
---
 lisp/org-element.el | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lisp/org-element.el b/lisp/org-element.el
index 110ff5624..6d7ec32c6 100644
--- a/lisp/org-element.el
+++ b/lisp/org-element.el
@@ -2222,14 +2222,14 @@ containing `:key', `:value', `:begin', `:end', `:post-blank' and
 ;;;; Latex Environment
 
 (defconst org-element--latex-begin-environment
-  "^[ \t]*\\\\begin{\\([A-Za-z0-9*]+\\)}"
+  "^[ \t]*\\(?:\\\\(\\|\\$\\)?\\\\begin{\\([A-Za-z0-9*]+\\)}"
   "Regexp matching the beginning of a LaTeX environment.
 The environment is captured by the first group.
 
 See also `org-element--latex-end-environment'.")
 
 (defconst org-element--latex-end-environment
-  "\\\\end{%s}[ \t]*$"
+  "\\\\end{%s}[ \t]*\\(?:\\\\)\\|\\$\\)?$"
   "Format string matching the ending of a LaTeX environment.
 See also `org-element--latex-begin-environment'.")
 
-- 
2.24.0