feat: add language support for corn (#4864)

Adds queries and a parser mapping for the [Corn](https://github.com/jakestanger/corn)
configuration language.

lua/nvim-treesitter/parsers.lua

@@ -237,6 +237,14 @@ list.cooklang = {
   maintainers = { "@addcninblue" },
 }
 
+list.corn = {
+  install_info = {
+    url = "https://github.com/jakestanger/tree-sitter-corn",
+    files = { "src/parser.c" },
+  },
+  maintainers = { "@jakestanger" },
+}
+
 list.cpon = {
   install_info = {
     url = "https://github.com/amaanq/tree-sitter-cpon",

queries/corn/folds.scm

@@ -0,0 +1,5 @@
+[
+ (object)
+ (array)
+ (assign_block)
+] @fold

queries/corn/highlights.scm

@@ -0,0 +1,22 @@
+"let" @keyword
+"in" @keyword
+
+[
+  "{"
+  "}"
+  "["
+  "]"
+] @punctuation.bracket
+
+"." @punctuation.delimiter
+
+(input) @constant
+(comment) @comment
+
+(string) @string
+(integer) @number
+(float) @float
+(boolean) @boolean
+(null) @keyword
+
+(ERROR) @error

queries/corn/indents.scm

@@ -0,0 +1,14 @@
+[
+ (assign_block "{")
+ (object)
+ (array)
+] @indent.begin
+
+(assign_block "}" @indent.branch)
+(assign_block "}" @indent.end)
+
+(object "}" @indent.branch)
+(object "}" @indent.end)
+
+(array "]" @indent.branch)
+(array "]" @indent.end)

queries/corn/locals.scm

@@ -0,0 +1,16 @@
+; scopes
+
+[
+  (object)
+  (array)
+] @scope
+
+; definitions
+
+(assign_block 
+  (assignment
+    (input) 
+      @definition.constant))
+
+(value (input) @reference)
+