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Edit File: erb.rb

# = ERB -- Ruby Templating
#
# Author:: Masatoshi SEKI
# Documentation:: James Edward Gray II and Gavin Sinclair
#
# 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.

#
# = 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)
#
# Prints: 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.
#
#
# == 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
#
# Generates:
#
# 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>
# <%= @desc %>
# 
# <ul>
# <% @features.each do |f| %>
# <li><%= f %></li>
# <% end %>
# </ul>
# 
# 
# <% if @cost < 10 %>
# Only <%= @cost %>!!!
# <% else %>
# Call for a price, today!
# <% end %>
# 
# 
# </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)
#
# Generates (some blank lines removed):
#
# <html>
# <head><title>Ruby Toys -- Rubysapien</title></head>
# <body>
# 
# <h1>Rubysapien (TZ-1002)</h1>
# Geek's Best Friend! Responds to Ruby commands...
# 
# <ul>
# <li>Listens for verbal commands in the Ruby language!</li>
# <li>Ignores Perl, Java, and all C variants.</li>
# <li>Karate-Chop Action!!!</li>
# <li>Matz signature on left leg.</li>
# <li>Gem studded eyes... Rubies, of course!</li>
# </ul>
# 
# 
# Call for a price, today!
# 
# 
# </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 the RAA.
#
# Rails, the web application framework, uses ERB to create views.
#
class ERB
 Revision = '$Date: 2009-02-24 02:44:50 +0900 (Tue, 24 Feb 2009) $' 	#'

# 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
  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 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)
	@compiler = compiler
	@line = []
	@script = ""
	@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)
      n = s.count("\n")
      if n > 0
        s.dump + "\n" * n
      else
        s.dump
      end
    end

def compile(s)
      out = Buffer.new(self)

content = ''
 scanner = make_scanner(s)
 scanner.scan do |token|
 next if token.nil? 
 next if token == ''
	if scanner.stag.nil?
	 case token
 when PercentLine
	 out.push("#{@put_cmd} #{content_dump(content)}") if content.size > 0
	 content = ''
 out.push(token.to_s)
 out.cr
	 when :cr
	 out.cr
	 when '<%', '<%=', '<%#'
	 scanner.stag = token
	 out.push("#{@put_cmd} #{content_dump(content)}") if content.size > 0
	 content = ''
	 when "\n"
	 content << "\n"
	 out.push("#{@put_cmd} #{content_dump(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 '<%='
	 out.push("#{@insert_cmd}((#{content}).to_s)")
	 when '<%#'
	 # out.push("# #{content_dump(content)}")
	 end
	 scanner.stag = nil
	 content = ''
	 when '%%>'
	 content << '%>'
	 else
	 content << token
	 end
	end
 end
 out.push("#{@put_cmd} #{content_dump(content)}") if content.size > 0
 out.close
 out.script
 end

def prepare_trim_mode(mode)
 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)
      Scanner.make_scanner(src, @trim_mode, @percent)
    end

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
    attr_accessor :put_cmd, :insert_cmd, :pre_cmd, :post_cmd
  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 $SAFE 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 %>
 # 
 # _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 = ERB::Compiler.new(trim_mode)
 set_eoutvar(compiler, eoutvar)
 @src = compiler.compile(str)
 @filename = nil
 end

# The Ruby code generated by ERB
  attr_reader :src

# The optional _filename_ argument passed to Kernel#eval when the ERB code
  # is run
  attr_accessor :filename

#
  # 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"

cmd = []
    cmd.push "#{eoutvar} = ''"
    
    compiler.pre_cmd = cmd

cmd = []
    cmd.push(eoutvar)

compiler.post_cmd = cmd
  end

# Generate results and print them. (see ERB#result)
  def run(b=TOPLEVEL_BINDING)
    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 or Proc object which is used to set the context of
  # code evaluation.
  #
  def result(b=TOPLEVEL_BINDING)
    if @safe_level
      proc { 
	$SAFE = @safe_level
	eval(@src, b, (@filename || '(erb)'), 1)
      }.call
    else
      eval(@src, b, (@filename || '(erb)'), 1)
    end
  end

# 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)')
    mod.module_eval("def #{methodname}\n" + self.src + "\nend\n", fname, 0)
  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)
 s.to_s.gsub(/&/, "&amp;").gsub(/\"/, "&quot;").gsub(/>/, "&gt;").gsub(/</, "&lt;")
 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.gsub(/[^a-zA-Z0-9_\-.]/n){ sprintf("%%%02X", $&.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 %>
 # <%= item %>
 # <% 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:
 #
 # 10
 #
 # 20
 #
 # 30
 #
 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

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