Added formatter

package.json

@@ -24,6 +24,7 @@
   "dependencies": {
     "js-yaml": "^3.12.0",
     "jsonc-parser": "^1.0.3",
+    "prettier": "^1.14.3",
     "request-light": "^0.2.3",
     "vscode-json-languageservice": "3.0.12",
     "vscode-languageserver": "^4.0.0",

src/languageservice/services/yamlFormatter.ts

@@ -5,43 +5,13 @@
  *--------------------------------------------------------------------------------------------*/
 'use strict';
 
-import * as jsyaml from 'js-yaml';
-import * as Yaml from 'yaml-ast-parser'
-import { EOL } from 'os';
 import { TextDocument, Range, Position, FormattingOptions, TextEdit } from 'vscode-languageserver-types';
+const prettier = require("prettier");
 
 export function format(document: TextDocument, options: FormattingOptions, customTags: Array<String>): TextEdit[] {
     const text = document.getText();
 
-    let schemaWithAdditionalTags = jsyaml.Schema.create(customTags.map((tag) => {
-		const typeInfo = tag.split(' ');
-		return new jsyaml.Type(typeInfo[0], { kind: typeInfo[1] || 'scalar' });
-	}));
+	const formatted = prettier.format(text, { parser: "yaml"});
 
-	//We need compiledTypeMap to be available from schemaWithAdditionalTags before we add the new custom properties
-	customTags.map((tag) => {
-		const typeInfo = tag.split(' ');
-		schemaWithAdditionalTags.compiledTypeMap[typeInfo[0]] = new jsyaml.Type(typeInfo[0], { kind: typeInfo[1] || 'scalar' });
-	});
-
-	let additionalOptions: Yaml.LoadOptions = {
-		schema: schemaWithAdditionalTags
-	}
-
-    const documents = []
-    jsyaml.loadAll(text, doc => documents.push(doc), additionalOptions)
-
-    const dumpOptions = { indent: options.tabSize, noCompatMode: true };
-
-    let newText;
-    if (documents.length == 1) {
-        const yaml = documents[0]
-        newText = jsyaml.safeDump(yaml, dumpOptions)
-    }
-    else {
-        const formatted = documents.map(d => jsyaml.safeDump(d, dumpOptions))
-        newText = '%YAML 1.2' + EOL + '---' + EOL + formatted.join('...' + EOL + '---' + EOL) + '...' + EOL
-    }
-
-    return [TextEdit.replace(Range.create(Position.create(0, 0), document.positionAt(text.length)), newText)]
-}
+    return [TextEdit.replace(Range.create(Position.create(0, 0), document.positionAt(text.length)), formatted)];
+}