benoit-ponsero/Application.java

## Application.java
package controllers;

import play.*;
import play.mvc.*;

import views.html.*;
import utils.JsMessages;

public class Application extends Controller {

  public static Result index() {
      return ok(index.render("Your new application is ready."));
  }

  public static Result jsMessages() {
      return JsMessages.expose("js.*","standalone.key");
  }

}

## index.scala.html
@(title: String)
<html>
	<head>
	</head>
	<body>
	<script type="text/javascript" src="@routes.Application.jsMessages()"></script>
	<script type="text/javascript">
	console.log(
		jsMessages('js.hello', 'world')
	)

	console.log(
		jsMessages('standalone.key')
	)
	</script>
</html>

## JsMessages.java
package utils;

import org.apache.commons.lang3.StringEscapeUtils;

import play.Play;
import play.api.Application;
import play.api.i18n.Messages;
import play.api.mvc.Codec;

import play.libs.Crypto;
import play.mvc.Http;
import play.mvc.Result;
import play.i18n.Lang;
import play.mvc.Results;
import scala.collection.JavaConversions;
import scala.collection.immutable.Map$;

import java.util.Map;
import java.util.HashMap;

public class JsMessages {

    private static Map<String, Result> cached = new HashMap<String,Result>();

    public synchronized static Result expose(String... exposedKeys){

        String      lang = Http.Context.current().lang().code();
        Application app  = play.Play.application().getWrappedApplication();

        String cachedKey = Crypto.sign(
            lang + Http.Context.current().request().path()
        );

        Result result = cached.get(cachedKey);
        if (result == null){

            Map<String,String> messages = new HashMap<String, String>();
            messages.putAll(JavaConversions.mapAsJavaMap(
                Messages.messages(app).get("default").get()
            ));
            messages.putAll(JavaConversions.mapAsJavaMap(
                Messages.messages(app).get(lang).get()
            ));

            String content = "var __messages__ = __messages__ || {};var jsMessages=function(c){var a=__messages__[c];if('undefined'==typeof a)return c;for(var b=1;b<arguments.length;b++)a=a.replace(RegExp('\\\\{'+(b-1)+'\\\\}','g'),arguments[b]);return a};";
            content+="(function (__messages__){";

            String jsKeys = "";
            for (String exposeKey : exposedKeys){

                if (exposeKey.endsWith(".*")){
                    String pattern = exposeKey.substring(0, exposeKey.length()-2);
                    for (String key : messages.keySet()){
                        if (key.startsWith(pattern)){
                             jsKeys += "'" + key + "':'"+ StringEscapeUtils.escapeEcmaScript(messages.get(key)) + "',";
                        }
                    }
                } else {
                    String trad = messages.get(exposeKey);
                    if (trad != null){
                        jsKeys += "'" + exposeKey + "':'"+ StringEscapeUtils.escapeEcmaScript(trad) + "',";
                    }
                }
            }
            if (jsKeys.length()>0){jsKeys = jsKeys.substring(0, jsKeys.length()-1);}
            content+="var _exposed = {" + jsKeys+"};";
            content+="var _extend=function(b,c){var b=b||{},a;for(a in c)b[a]='object'===typeof c[a]?extend(b[a],c[a]):c[a];return b};_extend(__messages__, _exposed);})(__messages__)";

            result = new Results.Status(
                play.core.j.JavaResults.Ok(), content, Codec.javaSupported("utf-8")
            ).as("application/javascript");

            cached.put(cachedKey,result);
        }

        return result;
    }
}

## messages
js.hello=Hello {0}
stanalone.key=This a desc with a "lot" of 'escaping characters'
	package controllers;

	import play.*;
	import play.mvc.*;

	import views.html.*;
	import utils.JsMessages;

	public class Application extends Controller {

	public static Result index() {
	return ok(index.render("Your new application is ready."));
	}

	public static Result jsMessages() {
	return JsMessages.expose("js.*","standalone.key");
	}

	}
	@(title: String)
	<html>
	<head>
	</head>
	<body>
	<script type="text/javascript" src="@routes.Application.jsMessages()"></script>
	<script type="text/javascript">
	console.log(
	jsMessages('js.hello', 'world')
	)

	console.log(
	jsMessages('standalone.key')
	)
	</script>
	</html>
	package utils;

	import org.apache.commons.lang3.StringEscapeUtils;

	import play.Play;
	import play.api.Application;
	import play.api.i18n.Messages;
	import play.api.mvc.Codec;

	import play.libs.Crypto;
	import play.mvc.Http;
	import play.mvc.Result;
	import play.i18n.Lang;
	import play.mvc.Results;
	import scala.collection.JavaConversions;
	import scala.collection.immutable.Map$;

	import java.util.Map;
	import java.util.HashMap;

	public class JsMessages {

	private static Map<String, Result> cached = new HashMap<String,Result>();

	public synchronized static Result expose(String... exposedKeys){

	String lang = Http.Context.current().lang().code();
	Application app = play.Play.application().getWrappedApplication();

	String cachedKey = Crypto.sign(
	lang + Http.Context.current().request().path()
	);

	Result result = cached.get(cachedKey);
	if (result == null){

	Map<String,String> messages = new HashMap<String, String>();
	messages.putAll(JavaConversions.mapAsJavaMap(
	Messages.messages(app).get("default").get()
	));
	messages.putAll(JavaConversions.mapAsJavaMap(
	Messages.messages(app).get(lang).get()
	));

	String content = "var __messages__ = __messages__ \|\| {};var jsMessages=function(c){var a=__messages__[c];if('undefined'==typeof a)return c;for(var b=1;b<arguments.length;b++)a=a.replace(RegExp('\\\\{'+(b-1)+'\\\\}','g'),arguments[b]);return a};";
	content+="(function (__messages__){";

	String jsKeys = "";
	for (String exposeKey : exposedKeys){

	if (exposeKey.endsWith(".*")){
	String pattern = exposeKey.substring(0, exposeKey.length()-2);
	for (String key : messages.keySet()){
	if (key.startsWith(pattern)){
	jsKeys += "'" + key + "':'"+ StringEscapeUtils.escapeEcmaScript(messages.get(key)) + "',";
	}
	}
	} else {
	String trad = messages.get(exposeKey);
	if (trad != null){
	jsKeys += "'" + exposeKey + "':'"+ StringEscapeUtils.escapeEcmaScript(trad) + "',";
	}
	}
	}
	if (jsKeys.length()>0){jsKeys = jsKeys.substring(0, jsKeys.length()-1);}
	content+="var _exposed = {" + jsKeys+"};";
	content+="var _extend=function(b,c){var b=b\|\|{},a;for(a in c)b[a]='object'===typeof c[a]?extend(b[a],c[a]):c[a];return b};_extend(__messages__, _exposed);})(__messages__)";

	result = new Results.Status(
	play.core.j.JavaResults.Ok(), content, Codec.javaSupported("utf-8")
	).as("application/javascript");

	cached.put(cachedKey,result);
	}

	return result;
	}
	}
	js.hello=Hello {0}
	stanalone.key=This a desc with a "lot" of 'escaping characters'