completion of if/then patterns for every if nested in blocks

Author: diyaayay

language-server/src/features/if-then-completion.js

@@ -0,0 +1,68 @@
+import { CompletionItemKind } from "vscode-languageserver";
+import { subscribe } from "../pubsub.js";
+
+
+export default {
+  onInitialize() {
+    return {};
+  },
+
+  onInitialized() {
+    subscribe("completions", async (_message, { document, offset, completions }) => {
+      const text = document.getText();
+      const startOfLine = text.lastIndexOf("\n", offset - 1) + 1;
+      const textBeforePosition = text.slice(startOfLine, offset);
+      if (textBeforePosition.trim().endsWith("\"if\":")) {
+        completions.push(...ifThenPatternCompletion());
+      }
+    });
+  }
+};
+
+function ifThenPatternCompletion() {
+  return [
+    {
+      label: "if/then",
+      kind: CompletionItemKind.Snippet,
+      insertText: `{
+          "type": "object",
+          "properties": {
+            "{varName}": { "const": "{value}" }
+          },
+          "required": ["{varName}"]
+        },
+        
+        "then": {
+        }`,
+      documentation: "Basic if/then pattern with a single condition and corresponding schema."
+    },
+    {
+      label: "If/then/else",
+      kind: CompletionItemKind.Snippet,
+      insertText: `{
+           "type": "object",
+           "properties": {
+            "{varName}": { "const": "{value}" }
+          },
+          "required": ["{varName}"]
+         },
+         "then": {
+         },
+         "else": {
+         }`,
+      documentation: "Conditional object structure with if/then/else logic"
+    },
+    {
+      label: "true",
+      kind: CompletionItemKind.Snippet,
+      insertText: `true`,
+      documentation: "if true"
+    },
+    {
+      label: "false",
+      kind: CompletionItemKind.Snippet,
+      insertText: `false`,
+      documentation: "if false"
+    }
+  ];
+}

language-server/src/server.js

@@ -17,6 +17,7 @@ import semanticTokensFeature from "./features/semantic-tokens.js";
 import validationErrorsFeature from "./features/validation-errors.js";
 import deprecatedFeature from "./features/deprecated.js";
 import completionFeature from "./features/completion.js";
+import ifThenCompletionFeature from "./features/if-then-completion.js";
 import schemaCompletion from "./features/schema-completion.js";
 import hoverFeature from "./features/hover.js";
 
@@ -34,6 +35,7 @@ const features = [
   deprecatedFeature,
   completionFeature,
   schemaCompletion,
+  ifThenCompletionFeature,
   hoverFeature,
   workspaceFeature // Workspace must be last
 ];