Merge pull request #40 from deepigarg/master

Issue #32 Implemented Insert method

lib/parfait/word.rb

@@ -190,6 +190,33 @@ module Parfait
     def padded_length
       Object.padded( 4 * get_type().instance_length + @char_length  )
     end
+    
+    def insert(index, other)
+      if index<0
+        index = length+1+index
+      end
+      cpy = Word.new( length+other.length )
+      cpy_ind=0
+      str_ind=0
+      while ( str_ind<index )
+        cpy.set_char(cpy_ind,get_char(str_ind))
+	      cpy_ind=cpy_ind+1
+	      str_ind=str_ind+1
+      end
+      oth_ind=0
+      while ( oth_ind<other.length )
+	      cpy.set_char(cpy_ind,other.get_char(oth_ind))
+	      cpy_ind=cpy_ind+1
+	      oth_ind=oth_ind+1
+      end
+      while ( str_ind<length )
+	      cpy.set_char(cpy_ind,get_char(str_ind))
+	      str_ind=str_ind+1
+	      cpy_ind=cpy_ind+1
+      end  
+      cpy
+    end
+
     def start_with(other)
       return false if other.length > self.length
         s = other.length
@@ -202,6 +229,7 @@ module Parfait
         end
         return true
       end
+    
     private
     def check_length
       raise "Length out of bounds #{char_length}" if @char_length > 1000

test/parfait/test_word.rb

@@ -26,5 +26,23 @@ module Parfait
         @word.set_char(1 , 32)
       end
     end
+    def test_insert_1
+      a = Parfait.new_word("abc")
+      b = Parfait.new_word("d")
+      ans = Parfait.new_word("abcd")
+      assert_equal ans, a.insert(-1,b)
+    end
+    def test_insert_2   
+      a1 = Parfait.new_word("what name")
+      b1 = Parfait.new_word("is your ")
+      ans = Parfait.new_word("what is your name")
+      assert_equal ans, a1.insert(5, b1)
+    end
+    def test_insert_3
+      a2 = Parfait.new_word("life")
+      b2 = Parfait.new_word("sad ")
+      ans = Parfait.new_word("sad life")
+      assert_equal ans, a2.insert(0, b2) 
+    end 
   end
 end