Add XQuery Completion Provider

src/completion/xquery-completion-item-provider.ts

@@ -0,0 +1,51 @@
+import { CompletionItem, CompletionItemKind, CompletionItemProvider, Position, TextDocument } from "vscode";
+
+const XQLint = require("xqlint").XQLint;
+
+export class XQueryCompletionItemProvider implements CompletionItemProvider {
+
+    provideCompletionItems(document: TextDocument, position: Position): CompletionItem[] {
+        const completionItems = new Array<CompletionItem>();
+        const linter = new XQLint(document.getText());
+
+        linter.getCompletions({ line: position.line, col: position.character }).forEach((x: any) => {
+            completionItems.push(this._getCompletionItem(x));
+        });
+
+        return completionItems;
+    }
+
+    private _getCompletionItem(xqLintCompletionItem: any): CompletionItem {
+        const completionItem = new CompletionItem(xqLintCompletionItem.name);
+        completionItem.insertText = xqLintCompletionItem.value;
+
+        switch (xqLintCompletionItem.meta) {
+            // functions (always qualified with a colon)
+            case "function":
+                completionItem.kind = CompletionItemKind.Function;
+
+                const funcStart = (xqLintCompletionItem.value.indexOf(":") + 1);
+                const funcEnd = xqLintCompletionItem.value.indexOf("(");
+
+                completionItem.insertText = xqLintCompletionItem.value.substring(funcStart, funcEnd);
+            break;
+
+            // variables and parameters (always qualified with a dollar sign)
+            case "Let binding":
+            case "Local variable":
+            case "Window variable":
+            case "Function parameter":
+                completionItem.kind = CompletionItemKind.Variable;
+                completionItem.insertText = xqLintCompletionItem.value.substring(1);
+            break;
+
+            // everything else
+            default:
+                completionItem.kind = CompletionItemKind.Text;
+            break;
+        }
+
+        return completionItem;
+    }
+
+}