added Gherkin highlighting support

demo/kitchen-sink/docs/gherkin.feature

@@ -0,0 +1,10 @@
+Feature: Serve coffee
+    Coffee should not be served until paid for
+    Coffee should not be served until the button has been pressed
+    If there is no coffee left then money should be refunded
+
+  Scenario: Buy last coffee
+    Given there are 1 coffees left in the machine
+    And I have deposited 1$
+    When I press the coffee button
+    Then I should be served a coffee

lib/ace/ext/modelist.js

@@ -67,6 +67,7 @@ var supportedModes = {
     EJS:         ["ejs"],
     Forth:       ["frt|fs|ldr"],
     FTL:         ["ftl"],
+    Gherkin:     ["feature"],
     Glsl:        ["glsl|frag|vert"],
     golang:      ["go"],
     Groovy:      ["groovy"],

lib/ace/mode/gherkin.js

@@ -0,0 +1,58 @@
+define(function(require, exports, module) {
+
+var oop = require("../lib/oop");
+var TextMode = require("./text").Mode;
+var Tokenizer = require("../tokenizer").Tokenizer;
+var GherkinHighlightRules = require("./gherkin_highlight_rules").GherkinHighlightRules;
+
+var Mode = function() {
+    this.$tokenizer = new Tokenizer(new GherkinHighlightRules().getRules());
+};
+oop.inherits(Mode, TextMode);
+
+(function() {
+    this.lineCommentStart = "#";
+    this.$id = "ace/mode/gherkin";
+
+    this.getNextLineIndent = function(state, line, tab) {
+        var indent = this.$getIndent(line);
+
+        var tokenizedLine = this.getTokenizer().getLineTokens(line, state);
+        var tokens = tokenizedLine.tokens;
+        
+        console.log(state)
+        
+		if(line.match("[ ]*\\|")) {
+			console.log(line.match("\|"));	
+            indent += "| ";
+        }
+
+        if (tokens.length && tokens[tokens.length-1].type == "comment") {
+            return indent;
+        }
+        
+
+        if (state == "start") {
+            if (line.match("Scenario:|Feature:")) {
+                indent = tab;
+            } else if(line.match("Given.+(:)$|Examples:")) {
+            	indent += tab;
+            } else if(line.match("\\*.+")) {
+            	indent += "* ";
+            } 
+        }
+        
+
+        return indent;
+    };
+    
+    this.checkOutdent = function(state, line, input) {
+    	if(line.match("Feature:")) {
+    		
+    	}
+    }
+    // Extra logic goes here. (see below)
+}).call(Mode.prototype);
+
+exports.Mode = Mode;
+});

lib/ace/mode/gherkin_highlight_rules.js

@@ -0,0 +1,83 @@
+define(function(require, exports, module) {
+
+var oop = require("../lib/oop");
+var TextHighlightRules = require("./text_highlight_rules").TextHighlightRules;
+var stringEscape =  "\\\\(x[0-9A-Fa-f]{2}|[0-7]{3}|[\\\\abfnrtv'\"]|U[0-9A-Fa-f]{8}|u[0-9A-Fa-f]{4})";
+
+var GherkinHighlightRules = function() {
+
+	// need to include constant ints
+    this.$rules = {
+    	start : [{
+            token: 'constant.numeric',
+            regex: "(?:(?:[1-9]\\d*)|(?:0))"
+ 		}, {
+    		token : "comment",
+    		regex : "#.*$"
+    	}, {
+    		token : "keyword",
+    		regex : "Feature:|Background:|Scenario:|Scenario Outline:|Examples:|Given|When|Then|And|But|\\*|Scenario\ Outline",
+    	}, {
+            token : "string",           // multi line """ string start
+            regex : '"{3}',
+            next : "qqstring3"
+        }, {
+            token : "string",           // " string
+            regex : '"',
+            next : "qqstring"
+        }, {
+        	token : "comment",
+        	regex : "@[A-Za-z0-9]+",
+        	next : "start"
+        }, {
+        	token : "comment",
+        	regex : "<.+>"
+        }, {
+        	token : "comment",
+        	regex : "\\| ",
+        	next : "table-item"
+        }, {
+        	token : "comment",
+        	regex : "\\|$",
+        	next : "start"
+        }],
+    	"qqstring3" : [ {
+            token : "constant.language.escape",
+            regex : stringEscape
+        }, {
+            token : "string", // multi line """ string end
+            regex : '"{3}',
+            next : "start"
+        }, {
+            defaultToken : "string"
+        }],
+    	"qqstring" : [{
+            token : "constant.language.escape",
+            regex : stringEscape
+        }, {
+            token : "string",
+            regex : "\\\\$",
+            next  : "qqstring"
+        }, {
+            token : "string",
+            regex : '"|$',
+            next  : "start"
+        }, {
+            defaultToken: "string"
+        }],
+        "table-item" : [{
+            token : "string",
+            regex : "[A-Za-z0-9 ]*",
+            next  : "start"
+        }],
+    };
+    
+    
+    //new TextHighlightRules().getRules();
+    
+}
+
+oop.inherits(GherkinHighlightRules, TextHighlightRules);
+
+exports.GherkinHighlightRules = GherkinHighlightRules;
+});