feat(tolk/rename): wrap in backticks for keyword names

server/src/e2e/tolk/testcases/rename/basic.test

@@ -480,7 +480,6 @@ Rename builtin type
 ========================================================================
 fun test(): int {
 //!         ^ bool
-    }
 }
 ------------------------------------------------------------------------
 The element can't be renamed.
@@ -491,7 +490,40 @@ Rename stdlib function
 fun test(): int {
     minMax();
 //! ^ otherFunc
-    }
 }
 ------------------------------------------------------------------------
 The element can't be renamed.
+
+========================================================================
+Wrap in backtick for keyword name
+========================================================================
+fun foo() {}
+
+fun test(): int {
+    foo();
+//! ^ return
+}
+------------------------------------------------------------------------
+fun `return`() {}
+
+fun test(): int {
+    `return`();
+//! ^ return
+}
+
+========================================================================
+Wrap in backtick for keyword name 2
+========================================================================
+fun foo() {}
+
+fun test(): int {
+    foo();
+//! ^ match
+}
+------------------------------------------------------------------------
+fun `match`() {}
+
+fun test(): int {
+    `match`();
+//! ^ match
+}

server/src/languages/tolk/lang/names-util.ts

@@ -4,3 +4,38 @@ export function trimBackticks(text: string): string {
     }
     return text
 }
+
+export const KEYWORDS = new Set([
+    "tolk",
+    "import",
+    "global",
+    "const",
+    "type",
+    "struct",
+    "fun",
+    "get",
+    "mutate",
+    "asm",
+    "builtin",
+    "var",
+    "val",
+    "return",
+    "repeat",
+    "if",
+    "else",
+    "do",
+    "while",
+    "break",
+    "continue",
+    "throw",
+    "assert",
+    "try",
+    "catch",
+    "lazy",
+    "is",
+    "!is",
+    "match",
+    "true",
+    "false",
+    "null",
+])

server/src/languages/tolk/rename/index.ts

@@ -7,6 +7,7 @@ import {NamedNode} from "@server/languages/tolk/psi/TolkNode"
 import {Reference} from "@server/languages/tolk/psi/Reference"
 import type {Node as SyntaxNode} from "web-tree-sitter"
 import type {Position} from "vscode-languageclient"
+import {KEYWORDS} from "@server/languages/tolk/lang/names-util"
 
 export function provideTolkRename(params: lsp.RenameParams, file: TolkFile): WorkspaceEdit | null {
     const renameNode = findRenameTarget(params, file)
@@ -82,6 +83,7 @@ export function provideTolkRenamePrepare(
 }
 
 function isValidIdentifier(name: string): boolean {
+    if (KEYWORDS.has(name)) return false
     return /^[A-Z_a-z]\w*$/.test(name)
 }