FIX: Don't substitute emojis within code blocks

app/assets/javascripts/discourse/lib/emoji/emoji.js.erb

@@ -12,6 +12,15 @@ Discourse.Dialect.registerEmoji = function(code, url) {
   extendedEmoji[code] = url;
 };
 
+var _unicodeReplacements;
+var _unicodeRegexp;
+Discourse.Dialect.setUnicodeReplacements = function(replacements) {
+  _unicodeReplacements = replacements;
+  if (replacements) {
+    _unicodeRegexp = new RegExp(Object.keys(replacements).join("|"), "g");
+  }
+}
+
 // This method is used by PrettyText to reset custom emojis in multisites
 Discourse.Dialect.resetEmojis = function() {
   extendedEmoji = {};
@@ -151,6 +160,19 @@ Object.keys(translations).forEach(function (t) {
   }
 });
 
+Discourse.Dialect.addPreProcessor(function(text) {
+  if (_unicodeReplacements) {
+    _unicodeRegexp.lastIndex = 0;
+
+    var m;
+    while ((m = _unicodeRegexp.exec(text)) !== null) {
+      text = text.replace(m[0], ":" + _unicodeReplacements[m[0]] + ":");
+    }
+  }
+
+  return text;
+});
+
 function escapeRegExp(s) {
   return s.replace(/[-/\\^$*+?.()|[\]{}]/gi, '\\$&');
 }

app/models/emoji.rb

@@ -131,12 +131,8 @@ class Emoji
     @unicode_replacements
   end
 
-  def self.unicode_regexp
-    @unicode_regexp ||= Regexp.union(unicode_replacements.keys)
-  end
-
-  def self.sub_unicode!(text)
-    text.gsub!(unicode_regexp) {|m| ":#{unicode_replacements[m]}:"}
+  def self.unicode_replacements_json
+    @unicode_replacements_json ||= unicode_replacements.to_json
   end
 
 end

lib/pretty_text.rb

@@ -201,6 +201,12 @@ module PrettyText
         end
       end
 
+      if SiteSetting.enable_emoji?
+        context.eval("Discourse.Dialect.setUnicodeReplacements(#{Emoji.unicode_replacements_json})");
+      else
+        context.eval("Discourse.Dialect.setUnicodeReplacements(null)");
+      end
+
       # reset emojis (v8 context is shared amongst multisites)
       context.eval("Discourse.Dialect.resetEmojis();")
       # custom emojis
@@ -259,7 +265,6 @@ module PrettyText
     options[:topicId] = opts[:topic_id]
 
     working_text = text.dup
-    Emoji.sub_unicode!(working_text) if SiteSetting.enable_emoji?
     sanitized = markdown(working_text, options)
 
     doc = Nokogiri::HTML.fragment(sanitized)

spec/components/pretty_text_spec.rb

@@ -395,6 +395,14 @@ HTML
       expect(PrettyText.cook("💣")).to match(/\:bomb\:/)
     end
 
+    it "doesn't replace emoji in inline code blocks with our emoji sets if emoji is enabled" do
+      expect(PrettyText.cook("`💣`")).not_to match(/\:bomb\:/)
+    end
+
+    it "doesn't replace emoji in code blocks with our emoji sets if emoji is enabled" do
+      expect(PrettyText.cook("```\n💣`\n```\n")).not_to match(/\:bomb\:/)
+    end
+
     it "replaces some glyphs that are not in the emoji range" do
       expect(PrettyText.cook("☺")).to match(/\:slightly_smiling\:/)
     end