Add message format support that can be used on complex localization strings

Add message about new and unread topics at the bottom of topics
move localization helper into lib

spec/components/js_locale_helper_spec.rb

@@ -0,0 +1,82 @@
+require 'spec_helper'
+require_dependency 'js_locale_helper'
+
+describe JsLocaleHelper do
+  it 'should be able to generate translations' do
+    JsLocaleHelper.output_locale('en').length.should > 0
+  end
+
+  def setup_message_format(format)
+    @ctx = V8::Context.new
+    @ctx.eval('MessageFormat = {locale: {}};')
+    @ctx.load(Rails.root + 'lib/javascripts/locale/en.js')
+    compiled = JsLocaleHelper.compile_message_format('en', format)
+    @ctx.eval("var test = #{compiled}")
+  end
+
+  def localize(opts)
+    @ctx.eval("test(#{opts.to_json})")
+  end
+
+  it 'handles plurals' do
+    setup_message_format('{NUM_RESULTS, plural,
+            one {1 result}
+          other {# results}
+        }')
+    localize(NUM_RESULTS: 1).should == '1 result'
+    localize(NUM_RESULTS: 2).should == '2 results'
+  end
+
+  it 'handles double plurals' do
+    setup_message_format('{NUM_RESULTS, plural,
+            one {1 result}
+          other {# results}
+        } and {NUM_APPLES, plural,
+            one {1 apple}
+          other {# apples}
+        }')
+
+
+    localize(NUM_RESULTS: 1, NUM_APPLES: 2).should == '1 result and 2 apples'
+    localize(NUM_RESULTS: 2, NUM_APPLES: 1).should == '2 results and 1 apple'
+  end
+
+  it 'handles select' do
+    setup_message_format('{GENDER, select, male {He} female {She} other {They}} read a book')
+    localize(GENDER: 'male').should == 'He read a book'
+    localize(GENDER: 'female').should == 'She read a book'
+    localize(GENDER: 'none').should == 'They read a book'
+  end
+
+  it 'can strip out message formats' do
+    hash = {"a" => "b", "c" => { "d" => {"f_MF" => "bob"} }}
+    JsLocaleHelper.strip_out_message_formats!(hash).should == {"c.d.f_MF" => "bob"}
+    hash["c"]["d"].should == {}
+  end
+
+  it 'handles message format special keys' do
+    ctx = V8::Context.new
+    ctx.eval("I18n = {};")
+    ctx.eval(JsLocaleHelper.output_locale('en',
+    {
+      "en" =>
+      {
+        "js" => {
+          "hello" => "world",
+          "test_MF" => "{HELLO} {COUNT, plural, one {1 duck} other {# ducks}}",
+          "error_MF" => "{{BLA}",
+          "simple_MF" => "{COUNT, plural, one {1} other {#}}"
+        }
+      }
+    }))
+
+    ctx.eval('I18n.translations')["en"]["js"]["hello"].should == "world"
+    ctx.eval('I18n.translations')["en"]["js"]["test_MF"].should be_nil
+
+    ctx.eval('I18n.messageFormat("test_MF", { HELLO: "hi", COUNT: 3 })').should == "hi 3 ducks"
+    ctx.eval('I18n.messageFormat("error_MF", { HELLO: "hi", COUNT: 3 })').should =~ /Invalid Format/
+    ctx.eval('I18n.messageFormat("missing", {})').should =~ /missing/
+    ctx.eval('I18n.messageFormat("simple_MF", {})').should =~ /COUNT/ # error
+  end
+
+end