From 3ee36163228c3664b2058c270cb20686fda4a1e8 Mon Sep 17 00:00:00 2001
From: domingo2000 <dedwards@buk.cl>
Date: Tue, 11 Mar 2025 14:17:20 -0300
Subject: [PATCH] Add support for ERB syntax highlighting in Heredoc sections

---
 vscode/grammars/ruby.cson.json         | 38 ++++++++++++++++++++++++++
 vscode/src/test/suite/grammars.test.ts |  4 +++
 2 files changed, 42 insertions(+)

diff --git a/vscode/grammars/ruby.cson.json b/vscode/grammars/ruby.cson.json
index 9e1a94e0b4..ffec84c418 100644
--- a/vscode/grammars/ruby.cson.json
+++ b/vscode/grammars/ruby.cson.json
@@ -1691,6 +1691,44 @@
         }
       ]
     },
+    {
+      "begin": "(?=(?><<[-~]([\"'`]?)((?:[_\\w]+_|)ERB)\\b\\1))",
+      "comment": "Heredoc with embedded ERB",
+      "end": "(?!\\G)",
+      "name": "meta.embedded.block.erb",
+      "patterns": [
+        {
+          "begin": "(?><<[-~]([\"'`]?)((?:[_\\w]+_|)ERB)\\b\\1)",
+          "beginCaptures": {
+            "0": {
+              "name": "punctuation.definition.string.begin.ruby"
+            }
+          },
+          "contentName": "text.html.erb",
+          "end": "^\\s*\\2$\\n?",
+          "endCaptures": {
+            "0": {
+              "name": "punctuation.definition.string.end.ruby"
+            }
+          },
+          "name": "string.unquoted.heredoc.ruby",
+          "patterns": [
+            {
+              "include": "#heredoc"
+            },
+            {
+              "include": "#interpolated_ruby"
+            },
+            {
+              "include": "text.html.erb"
+            },
+            {
+              "include": "#escaped_char"
+            }
+          ]
+        }
+      ]
+    },
     {
       "begin": "(?=(?><<[-~]([\"'`]?)((?:[_\\w]+_|)XML)\\b\\1))",
       "comment": "Heredoc with embedded XML",
diff --git a/vscode/src/test/suite/grammars.test.ts b/vscode/src/test/suite/grammars.test.ts
index 29e3395ca6..81b1d69b4d 100644
--- a/vscode/src/test/suite/grammars.test.ts
+++ b/vscode/src/test/suite/grammars.test.ts
@@ -36,6 +36,10 @@ const EMBEDDED_HEREDOC_LANGUAGES: InferrableLanguageConfigOrLabel[] = [
     id: "cpp",
     label: "C++",
   },
+  {
+    label: "ERB",
+    contentName: "text.html.erb",
+  },
   {
     label: "GraphQL",
     delimiters: ["GRAPHQL", "GQL"],