Add language support for GYB

.unacceptablelanguageignore

@@ -1,3 +1,4 @@
 assets/swift-docc-render
 src/utilities/utilities.ts
 src/tasks/SwiftProcess.ts
+syntaxes/swift-gyb.tmLanguage.json

.vscodeignore

@@ -12,3 +12,5 @@
 !assets/documentation-webview/**
 !assets/swift-docc-render/**
 !node_modules/@vscode/codicons/**
+!swift-gyb.language-configuration.json
+!syntaxes/**

package.json

@@ -83,6 +83,28 @@
         "filenamePatterns": [
           "*.tutorial"
         ]
+      },
+      {
+        "id": "swift-gyb",
+        "aliases": [
+          "Swift GYB"
+        ],
+        "extensions": [
+          ".swift.gyb"
+        ],
+        "configuration": "./swift-gyb.language-configuration.json"
+      }
+    ],
+    "grammars": [
+      {
+        "language": "swift-gyb",
+        "scopeName": "source.swift.gyb",
+        "path": "./syntaxes/swift-gyb.tmLanguage.json",
+        "embeddedLanguages": {
+          "meta.embedded.block.gyb": "python",
+          "meta.embedded.control.begin.gyb": "python",
+          "meta.embedded.expression.gyb": "python"
+        }
       }
     ],
     "snippets": [
@@ -1660,7 +1682,8 @@
     "pretest": "npm run compile-tests",
     "soundness": "scripts/soundness.sh",
     "check-package-json": "tsx ./scripts/check_package_json.ts",
-    "test": "vscode-test",
+    "test": "vscode-test && npm run grammar-test",
+    "grammar-test": "vscode-tmgrammar-test 'test/unit-tests/**/*.test.swift.gyb' -g test/unit-tests/syntaxes/swift.tmLanguage.json -g test/unit-tests/syntaxes/MagicPython.tmLanguage.json",
     "integration-test": "npm test -- --label integrationTests",
     "unit-test": "npm test -- --label unitTests",
     "coverage": "npm test -- --coverage",
@@ -1677,8 +1700,8 @@
     "@types/chai-subset": "^1.3.6",
     "@types/glob": "^7.1.6",
     "@types/lcov-parse": "^1.0.2",
-    "@types/lodash.throttle": "^4.1.9",
     "@types/lodash.debounce": "^4.0.9",
+    "@types/lodash.throttle": "^4.1.9",
     "@types/mocha": "^10.0.10",
     "@types/mock-fs": "^4.13.4",
     "@types/node": "^20.17.30",
@@ -1701,8 +1724,8 @@
     "esbuild": "^0.25.2",
     "eslint": "^8.57.0",
     "eslint-config-prettier": "^10.1.2",
-    "lodash.throttle": "^4.1.1",
     "lodash.debounce": "^4.0.8",
+    "lodash.throttle": "^4.1.1",
     "mocha": "^10.8.2",
     "mock-fs": "^5.5.0",
     "node-pty": "^1.0.0",
@@ -1714,7 +1737,8 @@
     "source-map-support": "^0.5.21",
     "strip-ansi": "^6.0.1",
     "tsx": "^4.19.3",
-    "typescript": "^5.8.3"
+    "typescript": "^5.8.3",
+    "vscode-tmgrammar-test": "^0.1.3"
   },
   "dependencies": {
     "@vscode/codicons": "^0.0.36",

swift-gyb.language-configuration.json

@@ -0,0 +1,17 @@
+{
+  "brackets": [["{", "}"]],
+  "autoClosingPairs": [
+    ["%{", "}%"],
+    ["${", "}"]
+  ],
+  "surroundingPairs": [
+    ["%{", "}%"],
+    ["${", "}"]
+  ],
+  "folding": {
+    "markers": {
+      "start": "^\\s*(?:%\\{|%[^\\{].*?:)",
+      "end": "^\\s*(?:\\}%|%\\s*end\\b)"
+    }
+  }
+}