feat(tolk/completion): add snippet for catch, fix completion for catch variable names

server/src/e2e/tolk/testcases/completion/local.test

@@ -33,7 +33,7 @@ fun foo() {
     }
 }
 ------------------------------------------------------------------------
-5  error   any
+5  error   int
 
 ========================================================================
 Variables completion from catch clause
@@ -45,8 +45,8 @@ fun foo() {
     }
 }
 ------------------------------------------------------------------------
-5  error   any
-5  errorData   any
+5  error   int
+5  errorData   unknown
 
 ========================================================================
 Variables completion from match expression

server/src/e2e/tolk/testcases/completion/snippets.test

@@ -0,0 +1,30 @@
+========================================================================
+Catch snippet
+========================================================================
+fun test() {
+    try {
+        // ...
+    } cat<caret>
+}
+------------------------------------------------------------------------
+14 catch
+
+========================================================================
+Catch snippet as expression
+========================================================================
+fun test() {
+    cat<caret>
+}
+------------------------------------------------------------------------
+No completion items
+
+========================================================================
+No completion for catch variable name
+========================================================================
+const eeee = 100
+
+fun test() {
+    try {} catch (e<caret>) {}
+}
+------------------------------------------------------------------------
+No completion items

server/src/languages/tolk/completion/CompletionContext.ts

@@ -20,6 +20,7 @@ export class CompletionContext {
     public insideImport: boolean = false
     public isAnnotationName: boolean = false
     public expectMatchArm: boolean = false
+    public catchVariable: boolean = false
 
     // struct fields
     public inNameOfFieldInit: boolean = false
@@ -54,6 +55,10 @@ export class CompletionContext {
             this.isAnnotationName = true
         }
 
+        if (parent.type === "catch_clause" && element.node.type === "identifier") {
+            this.catchVariable = true
+        }
+
         if (parent.type === "binary_operator" && parent.parent?.type === "match_arm") {
             // match (a) {
             //     <caret>
@@ -127,6 +132,7 @@ export class CompletionContext {
             !this.insideImport &&
             !this.structTopLevel &&
             !this.expectMatchArm &&
+            !this.catchVariable &&
             !this.isAnnotationName
         )
     }

server/src/languages/tolk/completion/providers/ReferenceCompletionProvider.ts

@@ -24,6 +24,7 @@ export class ReferenceCompletionProvider implements CompletionProvider<Completio
             !ctx.insideImport &&
             !ctx.isAnnotationName &&
             !ctx.structTopLevel &&
+            !ctx.catchVariable &&
             !ctx.expectMatchArm
         )
     }

server/src/languages/tolk/completion/providers/SnippetsCompletionProvider.ts

@@ -10,7 +10,7 @@ export class SnippetsCompletionProvider implements CompletionProvider<Completion
         return ctx.isStatement && !ctx.topLevel && !ctx.afterDot
     }
 
-    public addCompletion(_ctx: CompletionContext, result: CompletionResult): void {
+    public addCompletion(ctx: CompletionContext, result: CompletionResult): void {
         result.add({
             label: "val",
             kind: CompletionItemKind.Snippet,
@@ -99,5 +99,18 @@ export class SnippetsCompletionProvider implements CompletionProvider<Completion
             insertText: "try {\n\t${1}\n} catch (e) {\n\t${2}\n}",
             weight: CompletionWeight.SNIPPET,
         })
+
+        // if:
+        // try { ... } <caret>
+        const prevSibling = ctx.element.node.parent?.previousSibling
+        if (prevSibling?.firstChild?.type === "try") {
+            result.add({
+                label: "catch",
+                kind: CompletionItemKind.Snippet,
+                insertTextFormat: InsertTextFormat.Snippet,
+                insertText: "catch (${1:e}) {\n\t$0\n}",
+                weight: CompletionWeight.CONTEXT_ELEMENT,
+            })
+        }
     }
 }