From a35380d6f0ff65f7c35345baafcf1c3f8a378d38 Mon Sep 17 00:00:00 2001
From: aaronchucarroll <120818400+aaronchucarroll@users.noreply.github.com>
Date: Fri, 12 Jul 2024 00:51:37 -0400
Subject: [PATCH] Adds support for Github-style fenced math blocks in markdown
 editor and preview (#213750)

* added support for markdown fenced math blocks

* original markdownEngine.ts

* Add fenced math block rendering to markdown-math

* Update dependencies

* custom parser for fenced math blocks

* custom parser for fenced math blocks

* reverted changes to extension.ts

* reverted all changes from prior implementations

* proper fence grammar implementation for math

---------

Co-authored-by: Matt Bierner <matb@microsoft.com>
---
 .../src/markdownEngine.ts                     |  2 +-
 extensions/markdown-math/package.json         | 10 +++++++
 extensions/markdown-math/src/extension.ts     |  2 +-
 .../syntaxes/md-math-block.tmLanguage.json    |  2 +-
 .../syntaxes/md-math-fence.tmLanguage.json    | 28 +++++++++++++++++++
 5 files changed, 41 insertions(+), 3 deletions(-)
 create mode 100644 extensions/markdown-math/syntaxes/md-math-fence.tmLanguage.json

diff --git a/extensions/markdown-language-features/src/markdownEngine.ts b/extensions/markdown-language-features/src/markdownEngine.ts
index 103cbc191e4..fb906f63453 100644
--- a/extensions/markdown-language-features/src/markdownEngine.ts
+++ b/extensions/markdown-language-features/src/markdownEngine.ts
@@ -441,4 +441,4 @@ function normalizeHighlightLang(lang: string | undefined) {
 		default:
 			return lang;
 	}
-}
+}
\ No newline at end of file
diff --git a/extensions/markdown-math/package.json b/extensions/markdown-math/package.json
index ef56c5dc474..9669efc2435 100644
--- a/extensions/markdown-math/package.json
+++ b/extensions/markdown-math/package.json
@@ -56,6 +56,16 @@
           "meta.embedded.math.markdown": "latex",
           "punctuation.definition.math.end.markdown": "latex"
         }
+      },
+      {
+        "scopeName": "markdown.math.codeblock",
+        "path": "./syntaxes/md-math-fence.tmLanguage.json",
+        "injectTo": [
+          "text.html.markdown"
+        ],
+        "embeddedLanguages": {
+          "meta.embedded.math.markdown": "latex"
+        }
       }
     ],
     "notebookRenderer": [
diff --git a/extensions/markdown-math/src/extension.ts b/extensions/markdown-math/src/extension.ts
index 4e462e444be..6491b0c1459 100644
--- a/extensions/markdown-math/src/extension.ts
+++ b/extensions/markdown-math/src/extension.ts
@@ -43,4 +43,4 @@ export function activate(context: vscode.ExtensionContext) {
 			return md;
 		}
 	};
-}
+}
\ No newline at end of file
diff --git a/extensions/markdown-math/syntaxes/md-math-block.tmLanguage.json b/extensions/markdown-math/syntaxes/md-math-block.tmLanguage.json
index 43fd1bda5db..543568bf83e 100644
--- a/extensions/markdown-math/syntaxes/md-math-block.tmLanguage.json
+++ b/extensions/markdown-math/syntaxes/md-math-block.tmLanguage.json
@@ -82,4 +82,4 @@
 		}
 	},
 	"scopeName": "markdown.math.block"
-}
+}
\ No newline at end of file
diff --git a/extensions/markdown-math/syntaxes/md-math-fence.tmLanguage.json b/extensions/markdown-math/syntaxes/md-math-fence.tmLanguage.json
new file mode 100644
index 00000000000..556c579d3e7
--- /dev/null
+++ b/extensions/markdown-math/syntaxes/md-math-fence.tmLanguage.json
@@ -0,0 +1,28 @@
+{
+    "fileTypes": [],
+    "injectionSelector": "L:markup.fenced_code.block.markdown",
+    "patterns": [
+        {
+            "include": "#math-code-block"
+        }
+    ],
+    "repository": {
+        "math-code-block": {
+            "begin": "(?<=[`~])math(\\s+[^`~]*)?$",
+            "end": "(^|\\G)(?=\\s*[`~]{3,}\\s*$)",
+            "patterns": [
+                {
+                    "begin": "(^|\\G)(\\s*)(.*)",
+                    "while": "(^|\\G)(?!\\s*([`~]{3,})\\s*$)",
+                    "contentName": "meta.embedded.math.markdown",
+                    "patterns": [
+                        {
+                            "include": "text.html.markdown.math#math"
+                        }
+                    ]
+                }
+            ]
+        }
+    },
+    "scopeName": "markdown.math.codeblock"
+}