add tag v2_2_9

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/tags/v2_2_9@61257 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1022 insertions, 0 deletions

diff --git a/ruby_2_2/lib/erb.rb b/ruby_2_2/lib/erb.rb
new file mode 100644
index 0000000000..25654d62c5
--- /dev/null
+++ b/ruby_2_2/lib/erb.rb
@@ -0,0 +1,1022 @@
+# -*- coding: us-ascii -*-
+# = ERB -- Ruby Templating
+#
+# Author:: Masatoshi SEKI
+# Documentation:: James Edward Gray II, Gavin Sinclair, and Simon Chiang
+#
+# See ERB for primary documentation and ERB::Util for a couple of utility
+# routines.
+#
+# Copyright (c) 1999-2000,2002,2003 Masatoshi SEKI
+#
+# You can redistribute it and/or modify it under the same terms as Ruby.
+
+require "cgi/util"
+
+#
+# = ERB -- Ruby Templating
+#
+# == Introduction
+#
+# ERB provides an easy to use but powerful templating system for Ruby.  Using
+# ERB, actual Ruby code can be added to any plain text document for the
+# purposes of generating document information details and/or flow control.
+#
+# A very simple example is this:
+#
+#   require 'erb'
+#
+#   x = 42
+#   template = ERB.new <<-EOF
+#     The value of x is: <%= x %>
+#   EOF
+#   puts template.result(binding)
+#
+# <em>Prints:</em> The value of x is: 42
+#
+# More complex examples are given below.
+#
+#
+# == Recognized Tags
+#
+# ERB recognizes certain tags in the provided template and converts them based
+# on the rules below:
+#
+#   <% Ruby code -- inline with output %>
+#   <%= Ruby expression -- replace with result %>
+#   <%# comment -- ignored -- useful in testing %>
+#   % a line of Ruby code -- treated as <% line %> (optional -- see ERB.new)
+#   %% replaced with % if first thing on a line and % processing is used
+#   <%% or %%> -- replace with <% or %> respectively
+#
+# All other text is passed through ERB filtering unchanged.
+#
+#
+# == Options
+#
+# There are several settings you can change when you use ERB:
+# * the nature of the tags that are recognized;
+# * the value of <tt>$SAFE</tt> under which the template is run;
+# * the binding used to resolve local variables in the template.
+#
+# See the ERB.new and ERB#result methods for more detail.
+#
+# == Character encodings
+#
+# ERB (or Ruby code generated by ERB) returns a string in the same
+# character encoding as the input string.  When the input string has
+# a magic comment, however, it returns a string in the encoding specified
+# by the magic comment.
+#
+#   # -*- coding: utf-8 -*-
+#   require 'erb'
+#
+#   template = ERB.new <<EOF
+#   <%#-*- coding: Big5 -*-%>
+#     \_\_ENCODING\_\_ is <%= \_\_ENCODING\_\_ %>.
+#   EOF
+#   puts template.result
+#
+# <em>Prints:</em> \_\_ENCODING\_\_ is Big5.
+#
+#
+# == Examples
+#
+# === Plain Text
+#
+# ERB is useful for any generic templating situation.  Note that in this example, we use the
+# convenient "% at start of line" tag, and we quote the template literally with
+# <tt>%q{...}</tt> to avoid trouble with the backslash.
+#
+#   require "erb"
+#
+#   # Create template.
+#   template = %q{
+#     From:  James Edward Gray II <james@grayproductions.net>
+#     To:  <%= to %>
+#     Subject:  Addressing Needs
+#
+#     <%= to[/\w+/] %>:
+#
+#     Just wanted to send a quick note assuring that your needs are being
+#     addressed.
+#
+#     I want you to know that my team will keep working on the issues,
+#     especially:
+#
+#     <%# ignore numerous minor requests -- focus on priorities %>
+#     % priorities.each do |priority|
+#       * <%= priority %>
+#     % end
+#
+#     Thanks for your patience.
+#
+#     James Edward Gray II
+#   }.gsub(/^  /, '')
+#
+#   message = ERB.new(template, 0, "%<>")
+#
+#   # Set up template data.
+#   to = "Community Spokesman <spokesman@ruby_community.org>"
+#   priorities = [ "Run Ruby Quiz",
+#                  "Document Modules",
+#                  "Answer Questions on Ruby Talk" ]
+#
+#   # Produce result.
+#   email = message.result
+#   puts email
+#
+# <i>Generates:</i>
+#
+#   From:  James Edward Gray II <james@grayproductions.net>
+#   To:  Community Spokesman <spokesman@ruby_community.org>
+#   Subject:  Addressing Needs
+#
+#   Community:
+#
+#   Just wanted to send a quick note assuring that your needs are being addressed.
+#
+#   I want you to know that my team will keep working on the issues, especially:
+#
+#       * Run Ruby Quiz
+#       * Document Modules
+#       * Answer Questions on Ruby Talk
+#
+#   Thanks for your patience.
+#
+#   James Edward Gray II
+#
+# === Ruby in HTML
+#
+# ERB is often used in <tt>.rhtml</tt> files (HTML with embedded Ruby).  Notice the need in
+# this example to provide a special binding when the template is run, so that the instance
+# variables in the Product object can be resolved.
+#
+#   require "erb"
+#
+#   # Build template data class.
+#   class Product
+#     def initialize( code, name, desc, cost )
+#       @code = code
+#       @name = name
+#       @desc = desc
+#       @cost = cost
+#
+#       @features = [ ]
+#     end
+#
+#     def add_feature( feature )
+#       @features << feature
+#     end
+#
+#     # Support templating of member data.
+#     def get_binding
+#       binding
+#     end
+#
+#     # ...
+#   end
+#
+#   # Create template.
+#   template = %{
+#     <html>
+#       <head><title>Ruby Toys -- <%= @name %></title></head>
+#       <body>
+#
+#         <h1><%= @name %> (<%= @code %>)</h1>
+#         <p><%= @desc %></p>
+#
+#         <ul>
+#           <% @features.each do |f| %>
+#             <li><b><%= f %></b></li>
+#           <% end %>
+#         </ul>
+#
+#         <p>
+#           <% if @cost < 10 %>
+#             <b>Only <%= @cost %>!!!</b>
+#           <% else %>
+#              Call for a price, today!
+#           <% end %>
+#         </p>
+#
+#       </body>
+#     </html>
+#   }.gsub(/^  /, '')
+#
+#   rhtml = ERB.new(template)
+#
+#   # Set up template data.
+#   toy = Product.new( "TZ-1002",
+#                      "Rubysapien",
+#                      "Geek's Best Friend!  Responds to Ruby commands...",
+#                      999.95 )
+#   toy.add_feature("Listens for verbal commands in the Ruby language!")
+#   toy.add_feature("Ignores Perl, Java, and all C variants.")
+#   toy.add_feature("Karate-Chop Action!!!")
+#   toy.add_feature("Matz signature on left leg.")
+#   toy.add_feature("Gem studded eyes... Rubies, of course!")
+#
+#   # Produce result.
+#   rhtml.run(toy.get_binding)
+#
+# <i>Generates (some blank lines removed):</i>
+#
+#    <html>
+#      <head><title>Ruby Toys -- Rubysapien</title></head>
+#      <body>
+#
+#        <h1>Rubysapien (TZ-1002)</h1>
+#        <p>Geek's Best Friend!  Responds to Ruby commands...</p>
+#
+#        <ul>
+#            <li><b>Listens for verbal commands in the Ruby language!</b></li>
+#            <li><b>Ignores Perl, Java, and all C variants.</b></li>
+#            <li><b>Karate-Chop Action!!!</b></li>
+#            <li><b>Matz signature on left leg.</b></li>
+#            <li><b>Gem studded eyes... Rubies, of course!</b></li>
+#        </ul>
+#
+#        <p>
+#             Call for a price, today!
+#        </p>
+#
+#      </body>
+#    </html>
+#
+#
+# == Notes
+#
+# There are a variety of templating solutions available in various Ruby projects:
+# * ERB's big brother, eRuby, works the same but is written in C for speed;
+# * Amrita (smart at producing HTML/XML);
+# * cs/Template (written in C for speed);
+# * RDoc, distributed with Ruby, uses its own template engine, which can be reused elsewhere;
+# * and others; search {RubyGems.org}[https://rubygems.org/] or
+#   {The Ruby Toolbox}[https://www.ruby-toolbox.com/].
+#
+# Rails, the web application framework, uses ERB to create views.
+#
+class ERB
+  Revision = '$Date::                           $' # :nodoc: #'
+
+  # Returns revision information for the erb.rb module.
+  def self.version
+    "erb.rb [2.1.0 #{ERB::Revision.split[1]}]"
+  end
+end
+
+#--
+# ERB::Compiler
+class ERB
+  # = ERB::Compiler
+  #
+  # Compiles ERB templates into Ruby code; the compiled code produces the
+  # template result when evaluated. ERB::Compiler provides hooks to define how
+  # generated output is handled.
+  #
+  # Internally ERB does something like this to generate the code returned by
+  # ERB#src:
+  #
+  #   compiler = ERB::Compiler.new('<>')
+  #   compiler.pre_cmd    = ["_erbout=''"]
+  #   compiler.put_cmd    = "_erbout.concat"
+  #   compiler.insert_cmd = "_erbout.concat"
+  #   compiler.post_cmd   = ["_erbout"]
+  #
+  #   code, enc = compiler.compile("Got <%= obj %>!\n")
+  #   puts code
+  #
+  # <i>Generates</i>:
+  #
+  #   #coding:UTF-8
+  #   _erbout=''; _erbout.concat "Got "; _erbout.concat(( obj ).to_s); _erbout.concat "!\n"; _erbout
+  #
+  # By default the output is sent to the print method.  For example:
+  #
+  #   compiler = ERB::Compiler.new('<>')
+  #   code, enc = compiler.compile("Got <%= obj %>!\n")
+  #   puts code
+  #
+  # <i>Generates</i>:
+  #
+  #   #coding:UTF-8
+  #   print "Got "; print(( obj ).to_s); print "!\n"
+  #
+  # == Evaluation
+  #
+  # The compiled code can be used in any context where the names in the code
+  # correctly resolve. Using the last example, each of these print 'Got It!'
+  #
+  # Evaluate using a variable:
+  #
+  #   obj = 'It'
+  #   eval code
+  #
+  # Evaluate using an input:
+  #
+  #   mod = Module.new
+  #   mod.module_eval %{
+  #     def get(obj)
+  #       #{code}
+  #     end
+  #   }
+  #   extend mod
+  #   get('It')
+  #
+  # Evaluate using an accessor:
+  #
+  #   klass = Class.new Object
+  #   klass.class_eval %{
+  #     attr_accessor :obj
+  #     def initialize(obj)
+  #       @obj = obj
+  #     end
+  #     def get_it
+  #       #{code}
+  #     end
+  #   }
+  #   klass.new('It').get_it
+  #
+  # Good! See also ERB#def_method, ERB#def_module, and ERB#def_class.
+  class Compiler # :nodoc:
+    class PercentLine # :nodoc:
+      def initialize(str)
+        @value = str
+      end
+      attr_reader :value
+      alias :to_s :value
+
+      def empty?
+        @value.empty?
+      end
+    end
+
+    class Scanner # :nodoc:
+      @scanner_map = {}
+      def self.regist_scanner(klass, trim_mode, percent)
+        @scanner_map[[trim_mode, percent]] = klass
+      end
+
+      def self.default_scanner=(klass)
+        @default_scanner = klass
+      end
+
+      def self.make_scanner(src, trim_mode, percent)
+        klass = @scanner_map.fetch([trim_mode, percent], @default_scanner)
+        klass.new(src, trim_mode, percent)
+      end
+
+      def initialize(src, trim_mode, percent)
+        @src = src
+        @stag = nil
+      end
+      attr_accessor :stag
+
+      def scan; end
+    end
+
+    class TrimScanner < Scanner # :nodoc:
+      def initialize(src, trim_mode, percent)
+        super
+        @trim_mode = trim_mode
+        @percent = percent
+        if @trim_mode == '>'
+          @scan_line = self.method(:trim_line1)
+        elsif @trim_mode == '<>'
+          @scan_line = self.method(:trim_line2)
+        elsif @trim_mode == '-'
+          @scan_line = self.method(:explicit_trim_line)
+        else
+          @scan_line = self.method(:scan_line)
+        end
+      end
+      attr_accessor :stag
+
+      def scan(&block)
+        @stag = nil
+        if @percent
+          @src.each_line do |line|
+            percent_line(line, &block)
+          end
+        else
+          @scan_line.call(@src, &block)
+        end
+        nil
+      end
+
+      def percent_line(line, &block)
+        if @stag || line[0] != ?%
+          return @scan_line.call(line, &block)
+        end
+
+        line[0] = ''
+        if line[0] == ?%
+          @scan_line.call(line, &block)
+        else
+          yield(PercentLine.new(line.chomp))
+        end
+      end
+
+      def scan_line(line)
+        line.scan(/(.*?)(<%%|%%>|<%=|<%#|<%|%>|\n|\z)/m) do |tokens|
+          tokens.each do |token|
+            next if token.empty?
+            yield(token)
+          end
+        end
+      end
+
+      def trim_line1(line)
+        line.scan(/(.*?)(<%%|%%>|<%=|<%#|<%|%>\n|%>|\n|\z)/m) do |tokens|
+          tokens.each do |token|
+            next if token.empty?
+            if token == "%>\n"
+              yield('%>')
+              yield(:cr)
+            else
+              yield(token)
+            end
+          end
+        end
+      end
+
+      def trim_line2(line)
+        head = nil
+        line.scan(/(.*?)(<%%|%%>|<%=|<%#|<%|%>\n|%>|\n|\z)/m) do |tokens|
+          tokens.each do |token|
+            next if token.empty?
+            head = token unless head
+            if token == "%>\n"
+              yield('%>')
+              if is_erb_stag?(head)
+                yield(:cr)
+              else
+                yield("\n")
+              end
+              head = nil
+            else
+              yield(token)
+              head = nil if token == "\n"
+            end
+          end
+        end
+      end
+
+      def explicit_trim_line(line)
+        line.scan(/(.*?)(^[ \t]*<%\-|<%\-|<%%|%%>|<%=|<%#|<%|-%>\n|-%>|%>|\z)/m) do |tokens|
+          tokens.each do |token|
+            next if token.empty?
+            if @stag.nil? && /[ \t]*<%-/ =~ token
+              yield('<%')
+            elsif @stag && token == "-%>\n"
+              yield('%>')
+              yield(:cr)
+            elsif @stag && token == '-%>'
+              yield('%>')
+            else
+              yield(token)
+            end
+          end
+        end
+      end
+
+      ERB_STAG = %w(<%= <%# <%)
+      def is_erb_stag?(s)
+        ERB_STAG.member?(s)
+      end
+    end
+
+    Scanner.default_scanner = TrimScanner
+
+    class SimpleScanner < Scanner # :nodoc:
+      def scan
+        @src.scan(/(.*?)(<%%|%%>|<%=|<%#|<%|%>|\n|\z)/m) do |tokens|
+          tokens.each do |token|
+            next if token.empty?
+            yield(token)
+          end
+        end
+      end
+    end
+
+    Scanner.regist_scanner(SimpleScanner, nil, false)
+
+    begin
+      require 'strscan'
+      class SimpleScanner2 < Scanner # :nodoc:
+        def scan
+          stag_reg = /(.*?)(<%%|<%=|<%#|<%|\z)/m
+          etag_reg = /(.*?)(%%>|%>|\z)/m
+          scanner = StringScanner.new(@src)
+          while ! scanner.eos?
+            scanner.scan(@stag ? etag_reg : stag_reg)
+            yield(scanner[1])
+            yield(scanner[2])
+          end
+        end
+      end
+      Scanner.regist_scanner(SimpleScanner2, nil, false)
+
+      class ExplicitScanner < Scanner # :nodoc:
+        def scan
+          stag_reg = /(.*?)(^[ \t]*<%-|<%%|<%=|<%#|<%-|<%|\z)/m
+          etag_reg = /(.*?)(%%>|-%>|%>|\z)/m
+          scanner = StringScanner.new(@src)
+          while ! scanner.eos?
+            scanner.scan(@stag ? etag_reg : stag_reg)
+            yield(scanner[1])
+
+            elem = scanner[2]
+            if /[ \t]*<%-/ =~ elem
+              yield('<%')
+            elsif elem == '-%>'
+              yield('%>')
+              yield(:cr) if scanner.scan(/(\n|\z)/)
+            else
+              yield(elem)
+            end
+          end
+        end
+      end
+      Scanner.regist_scanner(ExplicitScanner, '-', false)
+
+    rescue LoadError
+    end
+
+    class Buffer # :nodoc:
+      def initialize(compiler, enc=nil)
+        @compiler = compiler
+        @line = []
+        @script = enc ? "#coding:#{enc}\n" : ""
+        @compiler.pre_cmd.each do |x|
+          push(x)
+        end
+      end
+      attr_reader :script
+
+      def push(cmd)
+        @line << cmd
+      end
+
+      def cr
+        @script << (@line.join('; '))
+        @line = []
+        @script << "\n"
+      end
+
+      def close
+        return unless @line
+        @compiler.post_cmd.each do |x|
+          push(x)
+        end
+        @script << (@line.join('; '))
+        @line = nil
+      end
+    end
+
+    def content_dump(s) # :nodoc:
+      n = s.count("\n")
+      if n > 0
+        s.dump + "\n" * n
+      else
+        s.dump
+      end
+    end
+
+    def add_put_cmd(out, content)
+      out.push("#{@put_cmd} #{content_dump(content)}")
+    end
+
+    def add_insert_cmd(out, content)
+      out.push("#{@insert_cmd}((#{content}).to_s)")
+    end
+
+    # Compiles an ERB template into Ruby code.  Returns an array of the code
+    # and encoding like ["code", Encoding].
+    def compile(s)
+      enc = s.encoding
+      raise ArgumentError, "#{enc} is not ASCII compatible" if enc.dummy?
+      s = s.b # see String#b
+      enc = detect_magic_comment(s) || enc
+      out = Buffer.new(self, enc)
+
+      content = ''
+      scanner = make_scanner(s)
+      scanner.scan do |token|
+        next if token.nil?
+        next if token == ''
+        if scanner.stag.nil?
+          case token
+          when PercentLine
+            add_put_cmd(out, content) if content.size > 0
+            content = ''
+            out.push(token.to_s)
+            out.cr
+          when :cr
+            out.cr
+          when '<%', '<%=', '<%#'
+            scanner.stag = token
+            add_put_cmd(out, content) if content.size > 0
+            content = ''
+          when "\n"
+            content << "\n"
+            add_put_cmd(out, content)
+            content = ''
+          when '<%%'
+            content << '<%'
+          else
+            content << token
+          end
+        else
+          case token
+          when '%>'
+            case scanner.stag
+            when '<%'
+              if content[-1] == ?\n
+                content.chop!
+                out.push(content)
+                out.cr
+              else
+                out.push(content)
+              end
+            when '<%='
+              add_insert_cmd(out, content)
+            when '<%#'
+              # out.push("# #{content_dump(content)}")
+            end
+            scanner.stag = nil
+            content = ''
+          when '%%>'
+            content << '%>'
+          else
+            content << token
+          end
+        end
+      end
+      add_put_cmd(out, content) if content.size > 0
+      out.close
+      return out.script, enc
+    end
+
+    def prepare_trim_mode(mode) # :nodoc:
+      case mode
+      when 1
+        return [false, '>']
+      when 2
+        return [false, '<>']
+      when 0
+        return [false, nil]
+      when String
+        perc = mode.include?('%')
+        if mode.include?('-')
+          return [perc, '-']
+        elsif mode.include?('<>')
+          return [perc, '<>']
+        elsif mode.include?('>')
+          return [perc, '>']
+        else
+          [perc, nil]
+        end
+      else
+        return [false, nil]
+      end
+    end
+
+    def make_scanner(src) # :nodoc:
+      Scanner.make_scanner(src, @trim_mode, @percent)
+    end
+
+    # Construct a new compiler using the trim_mode. See ERB::new for available
+    # trim modes.
+    def initialize(trim_mode)
+      @percent, @trim_mode = prepare_trim_mode(trim_mode)
+      @put_cmd = 'print'
+      @insert_cmd = @put_cmd
+      @pre_cmd = []
+      @post_cmd = []
+    end
+    attr_reader :percent, :trim_mode
+
+    # The command to handle text that ends with a newline
+    attr_accessor :put_cmd
+
+    # The command to handle text that is inserted prior to a newline
+    attr_accessor :insert_cmd
+
+    # An array of commands prepended to compiled code
+    attr_accessor :pre_cmd
+
+    # An array of commands appended to compiled code
+    attr_accessor :post_cmd
+
+    private
+    def detect_magic_comment(s)
+      if /\A<%#(.*)%>/ =~ s or (@percent and /\A%#(.*)/ =~ s)
+        comment = $1
+        comment = $1 if comment[/-\*-\s*(.*?)\s*-*-$/]
+        if %r"coding\s*[=:]\s*([[:alnum:]\-_]+)" =~ comment
+          enc = $1.sub(/-(?:mac|dos|unix)/i, '')
+          Encoding.find(enc)
+        end
+      end
+    end
+  end
+end
+
+#--
+# ERB
+class ERB
+  #
+  # Constructs a new ERB object with the template specified in _str_.
+  #
+  # An ERB object works by building a chunk of Ruby code that will output
+  # the completed template when run. If _safe_level_ is set to a non-nil value,
+  # ERB code will be run in a separate thread with <b>$SAFE</b> set to the
+  # provided level.
+  #
+  # If _trim_mode_ is passed a String containing one or more of the following
+  # modifiers, ERB will adjust its code generation as listed:
+  #
+  #     %  enables Ruby code processing for lines beginning with %
+  #     <> omit newline for lines starting with <% and ending in %>
+  #     >  omit newline for lines ending in %>
+  #     -  omit blank lines ending in -%>
+  #
+  # _eoutvar_ can be used to set the name of the variable ERB will build up
+  # its output in.  This is useful when you need to run multiple ERB
+  # templates through the same binding and/or when you want to control where
+  # output ends up.  Pass the name of the variable to be used inside a String.
+  #
+  # === Example
+  #
+  #  require "erb"
+  #
+  #  # build data class
+  #  class Listings
+  #    PRODUCT = { :name => "Chicken Fried Steak",
+  #                :desc => "A well messages pattie, breaded and fried.",
+  #                :cost => 9.95 }
+  #
+  #    attr_reader :product, :price
+  #
+  #    def initialize( product = "", price = "" )
+  #      @product = product
+  #      @price = price
+  #    end
+  #
+  #    def build
+  #      b = binding
+  #      # create and run templates, filling member data variables
+  #      ERB.new(<<-'END_PRODUCT'.gsub(/^\s+/, ""), 0, "", "@product").result b
+  #        <%= PRODUCT[:name] %>
+  #        <%= PRODUCT[:desc] %>
+  #      END_PRODUCT
+  #      ERB.new(<<-'END_PRICE'.gsub(/^\s+/, ""), 0, "", "@price").result b
+  #        <%= PRODUCT[:name] %> -- <%= PRODUCT[:cost] %>
+  #        <%= PRODUCT[:desc] %>
+  #      END_PRICE
+  #    end
+  #  end
+  #
+  #  # setup template data
+  #  listings = Listings.new
+  #  listings.build
+  #
+  #  puts listings.product + "\n" + listings.price
+  #
+  # _Generates_
+  #
+  #  Chicken Fried Steak
+  #  A well messages pattie, breaded and fried.
+  #
+  #  Chicken Fried Steak -- 9.95
+  #  A well messages pattie, breaded and fried.
+  #
+  def initialize(str, safe_level=nil, trim_mode=nil, eoutvar='_erbout')
+    @safe_level = safe_level
+    compiler = make_compiler(trim_mode)
+    set_eoutvar(compiler, eoutvar)
+    @src, @encoding = *compiler.compile(str)
+    @filename = nil
+    @lineno = 0
+  end
+
+  ##
+  # Creates a new compiler for ERB.  See ERB::Compiler.new for details
+
+  def make_compiler(trim_mode)
+    ERB::Compiler.new(trim_mode)
+  end
+
+  # The Ruby code generated by ERB
+  attr_reader :src
+
+  # The encoding to eval
+  attr_reader :encoding
+
+  # The optional _filename_ argument passed to Kernel#eval when the ERB code
+  # is run
+  attr_accessor :filename
+
+  # The optional _lineno_ argument passed to Kernel#eval when the ERB code
+  # is run
+  attr_accessor :lineno
+
+  def location=((filename, lineno))
+    @filename = filename
+    @lineno = lineno if lineno
+  end
+
+  #
+  # Can be used to set _eoutvar_ as described in ERB::new.  It's probably
+  # easier to just use the constructor though, since calling this method
+  # requires the setup of an ERB _compiler_ object.
+  #
+  def set_eoutvar(compiler, eoutvar = '_erbout')
+    compiler.put_cmd = "#{eoutvar}.concat"
+    compiler.insert_cmd = "#{eoutvar}.concat"
+    compiler.pre_cmd = ["#{eoutvar} = ''"]
+    compiler.post_cmd = ["#{eoutvar}.force_encoding(__ENCODING__)"]
+  end
+
+  # Generate results and print them. (see ERB#result)
+  def run(b=new_toplevel)
+    print self.result(b)
+  end
+
+  #
+  # Executes the generated ERB code to produce a completed template, returning
+  # the results of that code.  (See ERB::new for details on how this process
+  # can be affected by _safe_level_.)
+  #
+  # _b_ accepts a Binding object which is used to set the context of
+  # code evaluation.
+  #
+  def result(b=new_toplevel)
+    if @safe_level
+      proc {
+        $SAFE = @safe_level
+        eval(@src, b, (@filename || '(erb)'), @lineno)
+      }.call
+    else
+      eval(@src, b, (@filename || '(erb)'), @lineno)
+    end
+  end
+
+  ##
+  # Returns a new binding each time *near* TOPLEVEL_BINDING for runs that do
+  # not specify a binding.
+
+  def new_toplevel
+    TOPLEVEL_BINDING.dup
+  end
+  private :new_toplevel
+
+  # Define _methodname_ as instance method of _mod_ from compiled Ruby source.
+  #
+  # example:
+  #   filename = 'example.rhtml'   # 'arg1' and 'arg2' are used in example.rhtml
+  #   erb = ERB.new(File.read(filename))
+  #   erb.def_method(MyClass, 'render(arg1, arg2)', filename)
+  #   print MyClass.new.render('foo', 123)
+  def def_method(mod, methodname, fname='(ERB)')
+    src = self.src
+    magic_comment = "#coding:#{@encoding}\n"
+    mod.module_eval do
+      eval(magic_comment + "def #{methodname}\n" + src + "\nend\n", binding, fname, -2)
+    end
+  end
+
+  # Create unnamed module, define _methodname_ as instance method of it, and return it.
+  #
+  # example:
+  #   filename = 'example.rhtml'   # 'arg1' and 'arg2' are used in example.rhtml
+  #   erb = ERB.new(File.read(filename))
+  #   erb.filename = filename
+  #   MyModule = erb.def_module('render(arg1, arg2)')
+  #   class MyClass
+  #     include MyModule
+  #   end
+  def def_module(methodname='erb')
+    mod = Module.new
+    def_method(mod, methodname, @filename || '(ERB)')
+    mod
+  end
+
+  # Define unnamed class which has _methodname_ as instance method, and return it.
+  #
+  # example:
+  #   class MyClass_
+  #     def initialize(arg1, arg2)
+  #       @arg1 = arg1;  @arg2 = arg2
+  #     end
+  #   end
+  #   filename = 'example.rhtml'  # @arg1 and @arg2 are used in example.rhtml
+  #   erb = ERB.new(File.read(filename))
+  #   erb.filename = filename
+  #   MyClass = erb.def_class(MyClass_, 'render()')
+  #   print MyClass.new('foo', 123).render()
+  def def_class(superklass=Object, methodname='result')
+    cls = Class.new(superklass)
+    def_method(cls, methodname, @filename || '(ERB)')
+    cls
+  end
+end
+
+#--
+# ERB::Util
+class ERB
+  # A utility module for conversion routines, often handy in HTML generation.
+  module Util
+    public
+    #
+    # A utility method for escaping HTML tag characters in _s_.
+    #
+    #   require "erb"
+    #   include ERB::Util
+    #
+    #   puts html_escape("is a > 0 & a < 10?")
+    #
+    # _Generates_
+    #
+    #   is a &gt; 0 &amp; a &lt; 10?
+    #
+    def html_escape(s)
+      CGI.escapeHTML(s.to_s)
+    end
+    alias h html_escape
+    module_function :h
+    module_function :html_escape
+
+    #
+    # A utility method for encoding the String _s_ as a URL.
+    #
+    #   require "erb"
+    #   include ERB::Util
+    #
+    #   puts url_encode("Programming Ruby:  The Pragmatic Programmer's Guide")
+    #
+    # _Generates_
+    #
+    #   Programming%20Ruby%3A%20%20The%20Pragmatic%20Programmer%27s%20Guide
+    #
+    def url_encode(s)
+      s.to_s.b.gsub(/[^a-zA-Z0-9_\-.]/n) { |m|
+        sprintf("%%%02X", m.unpack("C")[0])
+      }
+    end
+    alias u url_encode
+    module_function :u
+    module_function :url_encode
+  end
+end
+
+#--
+# ERB::DefMethod
+class ERB
+  # Utility module to define eRuby script as instance method.
+  #
+  # === Example
+  #
+  # example.rhtml:
+  #   <% for item in @items %>
+  #   <b><%= item %></b>
+  #   <% end %>
+  #
+  # example.rb:
+  #   require 'erb'
+  #   class MyClass
+  #     extend ERB::DefMethod
+  #     def_erb_method('render()', 'example.rhtml')
+  #     def initialize(items)
+  #       @items = items
+  #     end
+  #   end
+  #   print MyClass.new([10,20,30]).render()
+  #
+  # result:
+  #
+  #   <b>10</b>
+  #
+  #   <b>20</b>
+  #
+  #   <b>30</b>
+  #
+  module DefMethod
+    public
+    # define _methodname_ as instance method of current module, using ERB
+    # object or eRuby file
+    def def_erb_method(methodname, erb_or_fname)
+      if erb_or_fname.kind_of? String
+        fname = erb_or_fname
+        erb = ERB.new(File.read(fname))
+        erb.def_method(self, methodname, fname)
+      else
+        erb = erb_or_fname
+        erb.def_method(self, methodname, erb.filename || '(ERB)')
+      end
+    end
+    module_function :def_erb_method
+  end
+end