Add SCSS Grammar (#1)

If an open source Tree-sitter parser is available, we can run `./vendor.sh download` to download the C code thats needed to add a grammar.

I'm using [serenadeai/tree-sitter-scss](https://github.com/serenadeai/tree-sitter-scss) to add the SCSS grammar.

The `vendor.sh` script is using features from the latest version of Bash. MacOS includes an older version of Bash so I updated my system to v5.

Add grammar:  name; version / tag of repo to download; files to download
`["scss"]="v1.0.0;parser.c;scanner.c"`

Add repository
`["scss"]="serenadeai/tree-sitter-scss"`

From root of repo run:
`./vendor.sh download`

In new grammar directory add:
- `binding.go`
- `binding_test.go`

Run your test to verify the new grammar works!

- [Install Bash 5 on macOS](https://scriptingosx.com/2019/02/install-bash-5-on-macos/)
- [Creating parsers | Tree-sitter](https://tree-sitter.github.io/tree-sitter/creating-parsers)
- smacker#58

Author: deequez

_automation/grammars.json

@@ -2,231 +2,171 @@
   {
     "language": "bash",
     "url": "https://github.com/tree-sitter/tree-sitter-bash",
-    "files": [
-      "parser.c",
-      "scanner.cc"
-    ],
+    "files": ["parser.c", "scanner.cc"],
     "reference": "v0.19.0",
     "revision": "b6667bed364733c8a8f8e5973749f86cfa04ba2a"
   },
   {
     "language": "c",
     "url": "https://github.com/tree-sitter/tree-sitter-c",
-    "files": [
-      "parser.c"
-    ],
+    "files": ["parser.c"],
     "reference": "v0.20.2",
     "revision": "7175a6dd5fc1cee660dce6fe23f6043d75af424a"
   },
   {
     "language": "csharp",
     "url": "https://github.com/tree-sitter/tree-sitter-c-sharp",
-    "files": [
-      "parser.c",
-      "scanner.c"
-    ],
+    "files": ["parser.c", "scanner.c"],
     "reference": "v0.20.0",
     "revision": "7a47daeaf0d410dd1a91c97b274bb7276dd96605"
   },
   {
     "language": "cpp",
     "url": "https://github.com/tree-sitter/tree-sitter-cpp",
-    "files": [
-      "parser.c",
-      "scanner.cc"
-    ],
+    "files": ["parser.c", "scanner.cc"],
     "reference": "v0.20.0",
     "revision": "f44509141e7e483323d2ec178f2d2e6c0fc041c1"
   },
   {
     "language": "css",
     "url": "https://github.com/tree-sitter/tree-sitter-css",
-    "files": [
-      "parser.c",
-      "scanner.c"
-    ],
+    "files": ["parser.c", "scanner.c"],
     "reference": "v0.19.0",
     "revision": "9668e889161358d18a558f68f1614b6edde34029"
   },
   {
     "language": "cue",
     "url": "https://github.com/eonpatapon/tree-sitter-cue",
-    "files": [
-      "parser.c",
-      "scanner.c"
-    ],
+    "files": ["parser.c", "scanner.c"],
     "reference": "main",
     "revision": "61843e3beebf19417e4fede4e8be4df1084317ad"
   },
   {
     "language": "dockerfile",
     "url": "https://github.com/camdencheek/tree-sitter-dockerfile",
-    "files": [
-      "parser.c"
-    ],
+    "files": ["parser.c"],
     "reference": "v0.1.2",
     "revision": "d34a0cebd094e830bdd2106a28cb2f1fb22401d8"
   },
   {
     "language": "elixir",
     "url": "https://github.com/elixir-lang/tree-sitter-elixir",
-    "files": [
-      "parser.c",
-      "scanner.cc"
-    ],
+    "files": ["parser.c", "scanner.cc"],
     "reference": "v0.1.0",
     "revision": "869dff3ceb8823ca4b17ca33b663667c8e41e8ba"
   },
   {
     "language": "elm",
     "url": "https://github.com/elm-tooling/tree-sitter-elm",
-    "files": [
-      "parser.c",
-      "scanner.cc"
-    ],
+    "files": ["parser.c", "scanner.cc"],
     "reference": "v5.6.3",
     "revision": "cce0e5938e7779f86cf8bf445eadf7df4b88229d"
   },
   {
     "language": "golang",
     "url": "https://github.com/tree-sitter/tree-sitter-go",
-    "files": [
-      "parser.c"
-    ],
+    "files": ["parser.c"],
     "reference": "master",
     "revision": "64457ea6b73ef5422ed1687178d4545c3e91334a"
   },
   {
     "language": "hcl",
     "url": "https://github.com/mitchellh/tree-sitter-hcl",
-    "files": [
-      "parser.c",
-      "scanner.cc"
-    ],
+    "files": ["parser.c", "scanner.cc"],
     "reference": "main",
     "revision": "a8bd2568d37065a3b451cfd91745607fac4aac84"
   },
   {
     "language": "html",
     "url": "https://github.com/tree-sitter/tree-sitter-html",
-    "files": [
-      "parser.c",
-      "scanner.cc",
-      "tag.h"
-    ],
+    "files": ["parser.c", "scanner.cc", "tag.h"],
     "reference": "v0.19.0",
     "revision": "d93af487cc75120c89257195e6be46c999c6ba18"
   },
   {
     "language": "java",
     "url": "https://github.com/tree-sitter/tree-sitter-java",
-    "files": [
-      "parser.c"
-    ],
+    "files": ["parser.c"],
     "reference": "v0.20.1",
     "revision": "09d650def6cdf7f479f4b78f595e9ef5b58ce31e"
   },
   {
     "language": "javascript",
     "url": "https://github.com/tree-sitter/tree-sitter-javascript",
-    "files": [
-      "parser.c",
-      "scanner.c"
-    ],
+    "files": ["parser.c", "scanner.c"],
     "reference": "v0.19.0",
     "revision": "efd8cc9ee8eb919c2ca0f0eebaeb8f39557d8a8a"
   },
   {
     "language": "kotlin",
     "url": "https://github.com/fwcd/tree-sitter-kotlin",
-    "files": [
-      "parser.c",
-      "scanner.c"
-    ],
+    "files": ["parser.c", "scanner.c"],
     "reference": "main",
     "revision": "cce9073807c6c1da81ce658d683fdac2878e5b57"
   },
   {
     "language": "lua",
     "url": "https://github.com/tjdevries/tree-sitter-lua",
-    "files": [
-      "parser.c",
-      "scanner.c"
-    ],
+    "files": ["parser.c", "scanner.c"],
     "reference": "master",
     "revision": "0e860f697901c9b610104eb61d3812755d5211fc"
   },
   {
     "language": "ocaml",
     "url": "https://github.com/tree-sitter/tree-sitter-ocaml",
-    "files": [
-      "parser.c",
-      "scanner.cc",
-      "scanner.h"
-    ],
+    "files": ["parser.c", "scanner.cc", "scanner.h"],
     "reference": "v0.20.1",
     "revision": "de07323343946c32759933cb3b7c78e821098cad"
   },
   {
     "language": "php",
     "url": "https://github.com/tree-sitter/tree-sitter-php",
-    "files": [
-      "parser.c",
-      "scanner.cc"
-    ],
+    "files": ["parser.c", "scanner.cc"],
     "reference": "v0.19.0",
     "revision": "3ef0d5c253affe4b7fb46d9505db6df143db565a"
   },
   {
     "language": "protobuf",
     "url": "https://github.com/mitchellh/tree-sitter-proto",
-    "files": [
-      "parser.c"
-    ],
+    "files": ["parser.c"],
     "reference": "main",
     "revision": "42d82fa18f8afe59b5fc0b16c207ee4f84cb185f"
   },
   {
     "language": "python",
     "url": "https://github.com/tree-sitter/tree-sitter-python",
-    "files": [
-      "parser.c",
-      "scanner.cc"
-    ],
+    "files": ["parser.c", "scanner.cc"],
     "reference": "v0.20.0",
     "revision": "2b9e9e0d231d5dd9f491d47f704817baee7d5af0"
   },
   {
     "language": "ruby",
     "url": "https://github.com/tree-sitter/tree-sitter-ruby",
-    "files": [
-      "parser.c",
-      "scanner.cc"
-    ],
+    "files": ["parser.c", "scanner.cc"],
     "reference": "v0.19.0",
     "revision": "fe6a2d634da0e16b11b5aa255cc3df568a4572fd"
   },
   {
     "language": "rust",
     "url": "https://github.com/tree-sitter/tree-sitter-rust",
-    "files": [
-      "parser.c",
-      "scanner.c"
-    ],
+    "files": ["parser.c", "scanner.c"],
     "reference": "v0.20.3",
     "revision": "0431a2c60828731f27491ee9fdefe25e250ce9c9"
   },
   {
     "language": "scala",
     "url": "https://github.com/tree-sitter/tree-sitter-scala",
-    "files": [
-      "parser.c",
-      "scanner.c",
-      "stack.h"
-    ],
+    "files": ["parser.c", "scanner.c", "stack.h"],
     "reference": "v0.19.1",
     "revision": "918f0fb948405181707a1772cab639f2d278d384"
   },
+  {
+    "language": "scss",
+    "url": "https://github.com/serenadeai/tree-sitter-scss",
+    "files": ["parser.c", "scanner.c"],
+    "reference": "v1.0.0",
+    "revision": "c478c6868648eff49eb04a4df90d703dc45b312a"
+  },
   {
     "language": "svelte",
     "url": "https://github.com/Himujjal/tree-sitter-svelte",
@@ -245,32 +185,22 @@
   {
     "language": "toml",
     "url": "https://github.com/ikatyang/tree-sitter-toml",
-    "files": [
-      "parser.c",
-      "scanner.c"
-    ],
+    "files": ["parser.c", "scanner.c"],
     "reference": "v0.5.1",
     "revision": "474fbbec27e27d76b45aeaf9191e8acb13a699e2"
   },
   {
     "language": "typescript",
     "url": "https://github.com/tree-sitter/tree-sitter-typescript",
-    "files": [
-      "parser.c",
-      "scanner.c"
-    ],
+    "files": ["parser.c", "scanner.c"],
     "reference": "v0.20.2",
     "revision": "5d20856f34315b068c41edaee2ac8a100081d259"
   },
   {
     "language": "yaml",
     "url": "https://github.com/ikatyang/tree-sitter-yaml",
-    "files": [
-      "parser.c",
-      "scanner.cc",
-      "schema.generated.cc"
-    ],
+    "files": ["parser.c", "scanner.cc", "schema.generated.cc"],
     "reference": "v0.5.0",
     "revision": "6129a83eeec7d6070b1c0567ec7ce3509ead607c"
   }
-]
+]

scss/binding.go

@@ -0,0 +1,16 @@
+package scss
+
+//#include "parser.h"
+//TSLanguage *tree_sitter_scss();
+import "C"
+
+import (
+	"unsafe"
+
+	sitter "github.com/codepen/go-tree-sitter"
+)
+
+func GetLanguage() *sitter.Language {
+	ptr := unsafe.Pointer(C.tree_sitter_scss())
+	return sitter.NewLanguage(ptr)
+}

scss/binding_test.go

@@ -0,0 +1,21 @@
+package scss_test
+
+import (
+	"context"
+	"testing"
+
+	sitter "github.com/codepen/go-tree-sitter"
+	"github.com/codepen/go-tree-sitter/scss"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestGrammar(t *testing.T) {
+	assert := assert.New(t)
+
+	n, err := sitter.ParseCtx(context.Background(), []byte(`@import "compass"; $text-color: #555555; body { color: $text-color; }`), scss.GetLanguage())
+	assert.NoError(err)
+	assert.Equal(
+		"(stylesheet (import_statement (string_value)) (declaration (variable_name) (color_value)) (rule_set (selectors (tag_name)) (block (declaration (property_name) (variable_value)))))",
+		n.String(),
+	)
+}