lib/math-to-itex.rb in math-to-itex-0.1.0 vs lib/math-to-itex.rb in math-to-itex-0.2.0

@@ -1,38 +1,43 @@
 require "math-to-itex/parser"
+require "math-to-itex/support_parens"
 require "math-to-itex/version"
 
 module MathToItex
-  refine String do
-    def convert_to_itex(&block)
-      self.gsub(MathToItex::Parser::REGEX) do |maths|
-        if maths =~ /\A\$(?!\$)/
-          just_maths = maths[1..-2]
-          type = :inline
-        elsif maths =~ /^\\\((?!\\\()/
-          just_maths = maths[2..-3]
-          type = :inline
-        elsif maths =~ /\A\$\$/
-          just_maths = maths[2..-3]
-          type = :display
-        elsif maths =~ /\A\\\[(?!\\\[)/
-          just_maths = maths[2..-3]
-          type = :display
-        elsif maths =~ /\A\\begin(?!\\begin)/
-          just_maths = maths[16..-15]
-          type = :display
-        end
 
-        # this is the format itex2MML expects
-        if type == :inline
-          just_maths = "$#{just_maths}$"
-        else
-          just_maths = "$$#{just_maths}$$"
-        end
+  def self.parens(string)
+    @string = string
+    self
+  end
 
-        next(just_maths) if block.nil?
+  def self.convert(&block)
+    @string.gsub(MathToItex::Parser::REGEX) do |maths|
+      if maths =~ /\A\$(?!\$)/
+        just_maths = maths[1..-2]
+        type = :inline
+      elsif maths =~ /^\\\((?!\\\()/
+        just_maths = maths[2..-3]
+        type = :inline
+      elsif maths =~ /\A\$\$/
+        just_maths = maths[2..-3]
+        type = :display
+      elsif maths =~ /\A\\\[(?!\\\[)/
+        just_maths = maths[2..-3]
+        type = :display
+      elsif maths =~ /\A\\begin(?!\\begin)/
+        just_maths = maths[16..-15]
+        type = :display
+      end
 
-        yield just_maths, type
+      # this is the format itex2MML expects
+      if type == :inline
+        just_maths = "$#{just_maths}$"
+      else
+        just_maths = "$$#{just_maths}$$"
       end
+
+      next(just_maths) if block.nil?
+
+      yield just_maths, type
     end
   end
 end