feat: Added YAML language linter

Add yaml linter

#3979 from asantos00/add-yaml-linter

.eslintignore

@@ -8,6 +8,7 @@ lib/ace/mode/php/*
 lib/ace/mode/xml/*
 lib/ace/mode/xquery/*
 lib/ace/mode/xquery.js
+lib/ace/mode/yaml/*
 lib/ace/test/asyncjs/
 lib/ace/lib/es5-shim.js
 lib/ace/keyboard/vim*.js

lib/ace/mode/yaml.js

@@ -36,6 +36,7 @@ var TextMode = require("./text").Mode;
 var YamlHighlightRules = require("./yaml_highlight_rules").YamlHighlightRules;
 var MatchingBraceOutdent = require("./matching_brace_outdent").MatchingBraceOutdent;
 var FoldMode = require("./folding/coffee").FoldMode;
+var WorkerClient = require("../worker/worker_client").WorkerClient;
 
 var Mode = function() {
     this.HighlightRules = YamlHighlightRules;
@@ -70,6 +71,21 @@ oop.inherits(Mode, TextMode);
         this.$outdent.autoOutdent(doc, row);
     };
 
+    this.createWorker = function(session) {
+        var worker = new WorkerClient(["ace"], "ace/mode/yaml_worker", "YamlWorker");
+        worker.attachToDocument(session.getDocument());
+
+        worker.on("annotate", function(results) {
+            session.setAnnotations(results.data);
+        });
+
+        worker.on("terminate", function() {
+            session.clearAnnotations();
+        });
+
+        return worker;
+    };
+
 
     this.$id = "ace/mode/yaml";
 }).call(Mode.prototype);