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# -- coding: us-ascii -- # frozen_string_literal: false # = 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:: 2017-07-09 20:06:31 +0000#$' # :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=String.new"] # 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=String.new; _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 = {} class << self def register_scanner(klass, trim_mode, percent) @scanner_map[[trim_mode, percent]] = klass end alias :regist_scanner :register_scanner 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 @stags = %w(<%% <%= <%# <%).freeze @etags = %w(%%> %>).freeze end attr_accessor :stag attr_reader :stags, :etags 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_reg = /(.?)(%>\r?\n\|#{(stags + etags).join('\|')}\|\n\|\z)/m @scan_line = self.method(:trim_line1) elsif @trim_mode == '<>' @scan_reg = /(.?)(%>\r?\n\|#{(stags + etags).join('\|')}\|\n\|\z)/m @scan_line = self.method(:trim_line2) elsif @trim_mode == '-' @scan_reg = /(.?)(^[ \t]<%\-\|<%\-\|-%>\r?\n\|-%>\|#{(stags + etags).join('\|')}\|\z)/m @scan_line = self.method(:explicit_trim_line) else @scan_reg = /(.?)(#{(stags + etags).join('\|')}\|\n\|\z)/m @scan_line = self.method(:scan_line) end end 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(@scan_reg) do \|tokens\| tokens.each do \|token\| next if token.empty? yield(token) end end end def trim_line1(line) line.scan(@scan_reg) do \|tokens\| tokens.each do \|token\| next if token.empty? if token == "%>\n" \|\| token == "%>\r\n" yield('%>') yield(:cr) else yield(token) end end end end def trim_line2(line) head = nil line.scan(@scan_reg) do \|tokens\| tokens.each do \|token\| next if token.empty? head = token unless head if token == "%>\n" \|\| token == "%>\r\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(@scan_reg) do \|tokens\| tokens.each do \|token\| next if token.empty? if @stag.nil? && /[ \t]<%-/ =~ token yield('<%') elsif @stag && (token == "-%>\n" \|\| token == "-%>\r\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(/(.?)(#{(stags + etags).join('\|')}\|\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 = /(.?)(#{stags.join('\|')}\|\z)/m etag_reg = /(.?)(#{etags.join('\|')}\|\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]<%-\|<%-\|#{stags.join('\|')}\|\z)/m etag_reg = /(.?)(-%>\|#{etags.join('\|')}\|\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(/(\r?\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, frozen=nil) @compiler = compiler @line = [] @script = '' @script << "#coding:#{enc}\n" if enc @script << "#frozen-string-literal:#{frozen}\n" unless frozen.nil? @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 magic_comment = detect_magic_comment(s, enc) out = Buffer.new(self, magic_comment) self.content = '' scanner = make_scanner(s) scanner.scan do \|token\| next if token.nil? next if token == '' if scanner.stag.nil? compile_stag(token, out, scanner) else compile_etag(token, out, scanner) end end add_put_cmd(out, content) if content.size > 0 out.close return out.script, magic_comment end def compile_stag(stag, out, scanner) case stag when PercentLine add_put_cmd(out, content) if content.size > 0 self.content = '' out.push(stag.to_s) out.cr when :cr out.cr when '<%', '<%=', '<%#' scanner.stag = stag add_put_cmd(out, content) if content.size > 0 self.content = '' when "\n" content << "\n" add_put_cmd(out, content) self.content = '' when '<%%' content << '<%' else content << stag end end def compile_etag(etag, out, scanner) case etag when '%>' compile_content(scanner.stag, out) scanner.stag = nil self.content = '' when '%%>' content << '%>' else content << etag end end def compile_content(stag, out) case 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 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 # A buffered text in #compile attr_accessor :content def detect_magic_comment(s, enc = nil) re = @percent ? /\G(?:<%#(.)%>\|%#(.)\n)/ : /\G<%#(.)%>/ frozen = nil s.scan(re) do comment = $+ comment = $1 if comment[/-\-\s(.?)\s--$/] case comment when %r"coding\s[=:]\s([[:alnum:]\-_]+)" enc = Encoding.find($1.sub(/-(?:mac\|dos\|unix)/i, '')) when %r"frozen[-_]string[-_]literal\s:\s([[:alnum:]]+)" frozen = $1 end end return enc, frozen end end end #-- # ERB class ERB # # Constructs a new ERB object with the template specified in _str_. # # An ERB object works by building a chunk of Ruby code that will output # the completed template when run. If _safe_level_ is set to a non-nil value, # ERB code will be run in a separate thread with <b>$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, @frozen_string = 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} = String.new"] 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 { $SAFE = @safe_level eval(@src, b, (@filename \|\| '(erb)'), @lineno) }.call else eval(@src, b, (@filename \|\| '(erb)'), @lineno) end end ## # Returns a new binding each time near* TOPLEVEL_BINDING for runs that do # not specify a binding. def new_toplevel TOPLEVEL_BINDING.dup end private :new_toplevel # Define _methodname_ as instance method of _mod_ from compiled Ruby source. # # example: # filename = 'example.rhtml' # 'arg1' and 'arg2' are used in example.rhtml # erb = ERB.new(File.read(filename)) # erb.def_method(MyClass, 'render(arg1, arg2)', filename) # print MyClass.new.render('foo', 123) def def_method(mod, methodname, fname='(ERB)') src = self.src.sub(/^(?!#\|$)/) {"def #{methodname}\n"} << "\nend\n" mod.module_eval do eval(src, binding, fname, -1) 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 > 0 & a < 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 Back

Edit File : erb.rb | Size : 27.25 KB

# -*- coding: us-ascii -*-
# frozen_string_literal: false
# = 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)
#
# 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.
#
# == 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
#
# Prints: \_\_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
#
# 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 {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:: 2017-07-09 20:06:31 +0000#$' # :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=String.new"]
 # compiler.put_cmd = "_erbout.concat"
 # compiler.insert_cmd = "_erbout.concat"
 # compiler.post_cmd = ["_erbout"]
 #
 # code, enc = compiler.compile("Got <%= obj %>!\n")
 # puts code
 #
 # Generates:
 #
 # #coding:UTF-8
 # _erbout=String.new; _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
 #
 # Generates:
 #
 # #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 = {}
 class << self
 def register_scanner(klass, trim_mode, percent)
 @scanner_map[[trim_mode, percent]] = klass
 end
 alias :regist_scanner :register_scanner
 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
 @stags = %w(<%% <%= <%# <%).freeze
 @etags = %w(%%> %>).freeze
 end
 attr_accessor :stag
 attr_reader :stags, :etags

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_reg = /(.*?)(%>\r?\n|#{(stags + etags).join('|')}|\n|\z)/m
 @scan_line = self.method(:trim_line1)
 elsif @trim_mode == '<>'
 @scan_reg = /(.*?)(%>\r?\n|#{(stags + etags).join('|')}|\n|\z)/m
 @scan_line = self.method(:trim_line2)
 elsif @trim_mode == '-'
 @scan_reg = /(.*?)(^[ \t]*<%\-|<%\-|-%>\r?\n|-%>|#{(stags + etags).join('|')}|\z)/m
 @scan_line = self.method(:explicit_trim_line)
 else
 @scan_reg = /(.*?)(#{(stags + etags).join('|')}|\n|\z)/m
 @scan_line = self.method(:scan_line)
 end
 end

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(@scan_reg) do |tokens|
          tokens.each do |token|
            next if token.empty?
            yield(token)
          end
        end
      end

def trim_line1(line)
        line.scan(@scan_reg) do |tokens|
          tokens.each do |token|
            next if token.empty?
            if token == "%>\n" || token == "%>\r\n"
              yield('%>')
              yield(:cr)
            else
              yield(token)
            end
          end
        end
      end

def trim_line2(line)
        head = nil
        line.scan(@scan_reg) do |tokens|
          tokens.each do |token|
            next if token.empty?
            head = token unless head
            if token == "%>\n" || token == "%>\r\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(@scan_reg) do |tokens|
 tokens.each do |token|
 next if token.empty?
 if @stag.nil? && /[ \t]*<%-/ =~ token
 yield('<%')
 elsif @stag && (token == "-%>\n" || token == "-%>\r\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(/(.*?)(#{(stags + etags).join('|')}|\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 = /(.*?)(#{stags.join('|')}|\z)/m
 etag_reg = /(.*?)(#{etags.join('|')}|\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]*<%-|<%-|#{stags.join('|')}|\z)/m
 etag_reg = /(.*?)(-%>|#{etags.join('|')}|\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(/(\r?\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, frozen=nil)
 @compiler = compiler
 @line = []
 @script = ''
 @script << "#coding:#{enc}\n" if enc
 @script << "#frozen-string-literal:#{frozen}\n" unless frozen.nil?
 @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
      magic_comment = detect_magic_comment(s, enc)
      out = Buffer.new(self, *magic_comment)

self.content = ''
      scanner = make_scanner(s)
      scanner.scan do |token|
        next if token.nil?
        next if token == ''
        if scanner.stag.nil?
          compile_stag(token, out, scanner)
        else
          compile_etag(token, out, scanner)
        end
      end
      add_put_cmd(out, content) if content.size > 0
      out.close
      return out.script, *magic_comment
    end

def compile_stag(stag, out, scanner)
 case stag
 when PercentLine
 add_put_cmd(out, content) if content.size > 0
 self.content = ''
 out.push(stag.to_s)
 out.cr
 when :cr
 out.cr
 when '<%', '<%=', '<%#'
 scanner.stag = stag
 add_put_cmd(out, content) if content.size > 0
 self.content = ''
 when "\n"
 content << "\n"
 add_put_cmd(out, content)
 self.content = ''
 when '<%%'
 content << '<%'
 else
 content << stag
 end
 end

def compile_etag(etag, out, scanner)
 case etag
 when '%>'
 compile_content(scanner.stag, out)
 scanner.stag = nil
 self.content = ''
 when '%%>'
 content << '%>'
 else
 content << etag
 end
 end

def compile_content(stag, out)
 case 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
 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

# A buffered text in #compile
    attr_accessor :content

def detect_magic_comment(s, enc = nil)
 re = @percent ? /\G(?:<%#(.*)%>|%#(.*)\n)/ : /\G<%#(.*)%>/
 frozen = nil
 s.scan(re) do
 comment = $+
 comment = $1 if comment[/-\*-\s*(.*?)\s*-*-$/]
 case comment
 when %r"coding\s*[=:]\s*([[:alnum:]\-_]+)"
 enc = Encoding.find($1.sub(/-(?:mac|dos|unix)/i, ''))
 when %r"frozen[-_]string[-_]literal\s*:\s*([[:alnum:]]+)"
 frozen = $1
 end
 end
 return enc, frozen
 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 $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 %>
 # - 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, @frozen_string = *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} = String.new"]
    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.sub(/^(?!#|$)/) {"def #{methodname}\n"} << "\nend\n"
 mod.module_eval do
 eval(src, binding, fname, -1)
 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 %>
 # <%= 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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