Don't lookahead for emoji, instead store previous potential emoji

A continuation of #3

lib/rumoji.rb

@@ -18,19 +18,30 @@ module Rumoji
   end
 
   def encode_io(readable, writeable=StringIO.new(""))
-    codepoints = readable.each_codepoint.entries
-    codepoints.each_with_index do |codepoint, index|
+    codepoints = readable.each_codepoint
+    previous_emoji = []
+
+    codepoints.each_with_object(writeable) do |codepoint, writer|
       possible_emoji = Emoji.select_by_codepoint(codepoint)
-      sequence = if possible_emoji.empty?
+      last_emoji = previous_emoji.pop
+
+      sequence =  if last_emoji.nil? || !last_emoji.codepoints.include?(codepoint)
+                    if possible_emoji.empty?
                       [codepoint].pack("U")
-      elsif possible_emoji.size.eql?(1)
+                    else
+                      multiple_codepoint_emoji = possible_emoji.select(&:multiple?)
+                      if multiple_codepoint_emoji.empty?
                         possible_emoji.first.code
                       else
-        find_multipoint_emoji_in_set(possible_emoji, codepoints[index + 1])
+                        previous_emoji.concat(multiple_codepoint_emoji) ; ""
                       end
-      writeable.write sequence
                     end
-    writeable
+                  else
+                    last_emoji.code
+                  end
+
+      writer.write sequence
+    end
   end
 
   def decode_io(readable, writeable=StringIO.new(""))
@@ -42,11 +53,5 @@ module Rumoji
 
 private
 
-  def find_multipoint_emoji_in_set(possible_emoji_set, next_codepoint)
-    if next_codepoint
-      emoji_or_nil = possible_emoji_set.find {|emoji| emoji.codepoints.include?(next_codepoint) }
-      emoji_or_nil.nil? ? "" : emoji_or_nil.code
-    end
-  end
 
 end

lib/rumoji/emoji.rb

@@ -38,6 +38,10 @@ module Rumoji
       @codepoints.entries
     end
 
+    def multiple?
+      codepoints.size > 1
+    end
+
     autoload :PEOPLE, 'rumoji/emoji/people'
     autoload :NATURE, 'rumoji/emoji/nature'
     autoload :OBJECTS, 'rumoji/emoji/objects'
@@ -55,7 +59,7 @@ module Rumoji
     end
 
     def self.select_by_codepoint(codepoint)
-      ALL.select {|emoji| emoji.codepoints.include? codepoint }
+      ALL.select {|emoji| emoji.codepoints.first.eql? codepoint }
     end
 
     def self.find_by_codepoint(codepoint)

lib/rumoji/emoji/symbols.rb

@@ -86,8 +86,8 @@ module Rumoji
       self.new("\u{2733}" , [:eight_spoked_asterisk]),
       self.new("\u{1f51a}", [:end]),
       self.new("\u{23e9}" , [:fast_forward]),
-      self.new("\u{0035}" , [:five]),
-      self.new("\u{0034}" , [:four]),
+      self.new("\u{0035 20e3}" , [:five]),
+      self.new("\u{0034 20e3}" , [:four]),
       self.new("\u{1f193}", [:free]),
       self.new("\u{264a}" , [:gemini]),
       self.new("\u{0023 20e3}" , [:hash]),

spec/rumoji_spec.rb

@@ -38,6 +38,12 @@ describe Rumoji do
         Rumoji.encode_io(io2).string.must_equal ":us:"
       end
 
+      it "transforms a stream of many emoji" do
+        num = ":one::two::three::four::five::six::seven::eight::nine::hash:"
+        emoji = StringIO.new("1⃣2⃣3⃣4⃣5⃣6⃣7⃣8⃣9⃣#⃣")
+        Rumoji.encode_io(emoji).string.must_equal num
+      end
+
       describe "with leading and trailing characters" do
         it "is able to pull multipoint emoji out of a sequence" do
           io = StringIO.new("An example of a multipoint emoji is the #{@us} flag.")