Add language support for rego (OpenPolicyAgent) (#6415)

4 files changed, 86 insertions, 0 deletions

diff --git a/book/src/generated/lang-support.md b/book/src/generated/lang-support.md
index 524c2adf..996bdb43 100644
--- a/book/src/generated/lang-support.md
+++ b/book/src/generated/lang-support.md
@@ -112,6 +112,7 @@
 | r | ✓ |  |  | `R` |
 | racket | ✓ |  |  | `racket` |
 | regex | ✓ |  |  |  |
+| rego | ✓ |  |  | `regols` |
 | rescript | ✓ | ✓ |  | `rescript-language-server` |
 | rmarkdown | ✓ |  | ✓ | `R` |
 | ron | ✓ |  | ✓ |  |
diff --git a/languages.toml b/languages.toml
index f6a54e87..fe94d699 100644
--- a/languages.toml
+++ b/languages.toml
@@ -2383,3 +2383,18 @@ injection-regex = "vhdl"
 [[grammar]]
 name = "vhdl"
 source = { git = "https://github.com/teburd/tree-sitter-vhdl", rev = "c57313adee2231100db0a7880033f6865deeadb2" }
+
+[[language]]
+name = "rego"
+roots = []
+scope = "source.rego"
+injection-regex = "rego"
+file-types = ["rego"]
+auto-format = true
+comment-token = "#"
+language-server = { command = "regols" }
+grammar = "rego"
+
+[[grammar]]
+name = "rego"
+source = { git = "https://github.com/FallenAngel97/tree-sitter-rego", rev = "b2667c975f07b33be3ceb83bea5cfbad88095866" }
diff --git a/runtime/queries/rego/highlights.scm b/runtime/queries/rego/highlights.scm
new file mode 100644
index 00000000..0ff6de55
--- /dev/null
+++ b/runtime/queries/rego/highlights.scm
@@ -0,0 +1,68 @@
+[
+  (import)
+] @keyword.control.import
+
+[
+  (package)
+] @namespace
+
+[
+  (with)
+  (as)
+  (every)
+  (some)
+  (in)
+  (default)
+  "null"
+] @keyword.control
+
+[
+  (not)
+  (if)
+  (contains)
+  (else)
+] @keyword.control.conditional
+
+[
+  (boolean)
+] @constant.builtin.boolean
+
+[
+  (assignment_operator)
+  (bool_operator)
+  (arith_operator)
+  (bin_operator)
+] @operator
+
+[
+  (string)
+  (raw_string)
+] @string
+
+(term (ref (var))) @variable
+
+(comment) @comment.line
+
+(number) @constant.numeric.integer
+
+(expr_call func_name: (fn_name (var) @function .))
+
+(expr_call func_arguments: (fn_args (expr) @variable.parameter))
+
+(rule_args (term) @variable.parameter)
+
+[
+  (open_paren)
+  (close_paren)
+  (open_bracket)
+  (close_bracket)
+  (open_curly)
+  (close_curly)
+] @punctuation.bracket
+
+(rule (rule_head (var) @function.method))
+
+(rule
+  (rule_head (term (ref (var) @namespace)))
+  (rule_body (query (literal (expr (expr_infix (expr (term (ref (var)) @_output)))))) (#eq? @_output @namespace))
+)
diff --git a/runtime/queries/rego/injections.scm b/runtime/queries/rego/injections.scm
new file mode 100644
index 00000000..321c90ad
--- /dev/null
+++ b/runtime/queries/rego/injections.scm
@@ -0,0 +1,2 @@
+((comment) @injection.content
+ (#set! injection.language "comment"))