feat: JS/ERB language support (#188)

Introduces configuration, highlighting, and injection files for JS/ERB
templates.

---------

Co-authored-by: Marco Roth <[email protected]>

Author: Otterpocket

extension.toml

@@ -13,13 +13,14 @@ languages = ["Ruby"]
 
 [language_servers.ruby-lsp]
 name = "Ruby LSP"
-languages = ["Ruby", "ERB", "HTML/ERB", "YAML/ERB"]
+languages = ["Ruby", "ERB", "HTML/ERB", "YAML/ERB", "JS/ERB"]
 
 [language_servers.ruby-lsp.language_ids]
 "Ruby" = "ruby"
 "ERB" = "erb"
 "HTML/ERB" = "erb"
 "YAML/ERB" = "erb"
+"JS/ERB" = "erb"
 
 [language_servers.rubocop]
 name = "Rubocop"

languages/js-erb/config.toml

@@ -0,0 +1,7 @@
+name = "JS+ERB"
+grammar = "embedded_template"
+path_suffixes = ["js.erb"]
+autoclose_before = ">})"
+brackets = [{ start = "<", end = ">", close = true, newline = true }]
+block_comment = ["<%#", "%>"]
+word_characters = ["?", "!"]

languages/js-erb/highlights.scm

@@ -0,0 +1,12 @@
+(comment_directive) @comment
+
+[
+  "<%#"
+  "<%"
+  "<%="
+  "<%_"
+  "<%-"
+  "%>"
+  "-%>"
+  "_%>"
+] @keyword

languages/js-erb/injections.scm

@@ -0,0 +1,7 @@
+((code) @content
+  (#set! "language" "ruby")
+  (#set! "combined"))
+
+((content) @content
+  (#set! "language" "javascript")
+  (#set! "combined"))