From 3006eb5063fa441f76c7d40b271f34a62729bfa9 Mon Sep 17 00:00:00 2001
From: Stephen Power
 <88420791+opensourcecheemsburgers@users.noreply.github.com>
Date: Sun, 25 Jan 2026 18:51:50 +0200
Subject: [PATCH] Add support for LESS (#14303)

---
 book/src/generated/lang-support.md  |  1 +
 languages.toml                      | 14 ++++++++++++
 runtime/queries/less/highlights.scm | 35 +++++++++++++++++++++++++++++
 runtime/queries/less/indents.scm    |  7 ++++++
 runtime/queries/less/injections.scm |  2 ++
 runtime/queries/less/rainbows.scm   | 15 +++++++++++++
 6 files changed, 74 insertions(+)
 create mode 100644 runtime/queries/less/highlights.scm
 create mode 100644 runtime/queries/less/indents.scm
 create mode 100644 runtime/queries/less/injections.scm
 create mode 100644 runtime/queries/less/rainbows.scm

diff --git a/book/src/generated/lang-support.md b/book/src/generated/lang-support.md
index e6707dd8..f963a80c 100644
--- a/book/src/generated/lang-support.md
+++ b/book/src/generated/lang-support.md
@@ -161,6 +161,7 @@
 | ldif | ✓ |  |  |  |  |  |
 | lean | ✓ |  |  |  |  | `lake` |
 | ledger | ✓ |  |  |  |  |  |
+| less | ✓ |  | ✓ |  | ✓ | `vscode-css-language-server` |
 | llvm | ✓ | ✓ | ✓ |  |  |  |
 | llvm-mir | ✓ | ✓ | ✓ |  |  |  |
 | llvm-mir-yaml | ✓ |  | ✓ |  |  |  |
diff --git a/languages.toml b/languages.toml
index 1a54d3c3..fbabe10b 100644
--- a/languages.toml
+++ b/languages.toml
@@ -1027,6 +1027,20 @@ indent = { tab-width = 2, unit = "  " }
 name = "scss"
 source = { git = "https://github.com/serenadeai/tree-sitter-scss", rev = "c478c6868648eff49eb04a4df90d703dc45b312a" }
 
+[[language]]
+name = "less"
+scope = "source.less"
+injection-regex = "less"
+file-types = ["less"]
+block-comment-tokens = { start = "/*", end = "*/" }
+language-servers = [ "vscode-css-language-server" ]
+auto-format = true
+indent = { tab-width = 2, unit = "  " }
+
+[[grammar]]
+name = "less"
+source = { git = "https://github.com/jimliang/tree-sitter-less", rev = "e5ae6245f841b5778c79ac93b28fa4f56b679c5d" }
+
 [[language]]
 name = "html"
 scope = "text.html.basic"
diff --git a/runtime/queries/less/highlights.scm b/runtime/queries/less/highlights.scm
new file mode 100644
index 00000000..2a3ebce5
--- /dev/null
+++ b/runtime/queries/less/highlights.scm
@@ -0,0 +1,35 @@
+; inherits: css
+
+[
+  "@import"
+  "@namespace"
+  "@charset"
+] @keyword
+
+(js_comment) @comment
+
+(function_name) @function
+
+[
+  ">="
+  "<="
+] @operator
+
+(plain_value) @string
+
+(keyword_query) @function
+
+(identifier) @variable
+
+(variable) @variable
+
+(arguments
+  (variable) @variable.parameter)
+
+[
+  "["
+  "]"
+] @punctuation.bracket
+
+(import_statement
+  (identifier) @function)
diff --git a/runtime/queries/less/indents.scm b/runtime/queries/less/indents.scm
new file mode 100644
index 00000000..1dfd977d
--- /dev/null
+++ b/runtime/queries/less/indents.scm
@@ -0,0 +1,7 @@
+[
+  (block)
+] @indent
+
+[
+ "}"
+] @outdent
diff --git a/runtime/queries/less/injections.scm b/runtime/queries/less/injections.scm
new file mode 100644
index 00000000..321c90ad
--- /dev/null
+++ b/runtime/queries/less/injections.scm
@@ -0,0 +1,2 @@
+((comment) @injection.content
+ (#set! injection.language "comment"))
diff --git a/runtime/queries/less/rainbows.scm b/runtime/queries/less/rainbows.scm
new file mode 100644
index 00000000..66b60d51
--- /dev/null
+++ b/runtime/queries/less/rainbows.scm
@@ -0,0 +1,15 @@
+[
+  (keyframe_block_list)
+  (block)
+  (attribute_selector)
+  (feature_query)
+  (parenthesized_query)
+  (selector_query)
+  (parenthesized_value)
+  (arguments)
+] @rainbow.scope
+
+[
+  "{" "}"
+  "(" ")"
+] @rainbow.bracket
-- 
2.51.2