The last XPath query is being persisted and can be reused with the ne…

…xt query.

src/features/xmlXPathEngine.ts

@@ -9,14 +9,17 @@ let resultChannel: OutputChannel = null;
 export function evaluateXPath(editor: TextEditor, edit: TextEditorEdit): void {
 	window.showInputBox({
 		placeHolder: 'XPath Query',
-		prompt: 'Please enter an XPath query to evaluate.'
+		prompt: 'Please enter an XPath query to evaluate.',
+		value: Singleton.getXPathValue()
 
 	}).then((query) => {
 		if (query === undefined) return;
 
 		let xml = editor.document.getText();
 		let doc = new dom().parseFromString(xml);
 
+		Singleton.setXPathValue(query);
+
 		try {
 			var nodes = xpath.select(query, doc);
 		}
@@ -42,4 +45,22 @@ export function evaluateXPath(editor: TextEditor, edit: TextEditorEdit): void {
 
 		resultChannel.show(ViewColumn.Three);
 	});
+}
+
+namespace Singleton {
+
+	class XPathContext 
+	{
+		static _lastXPathValue:string = '';
+	}
+
+    export function getXPathValue():string
+	{ 
+		 return XPathContext._lastXPathValue;
+	}
+
+	export function setXPathValue(val:string):void 
+	{ 
+		 XPathContext._lastXPathValue = val;
+	}
 }