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escape.rb

# frozen_string_literal: true

# Since Ruby 4.0, \CGI is a small holder for various escaping methods, included from CGI::Escape
#
#    require 'cgi/escape'
#
#    CGI.escape("Ruby programming language")
#    #=> "Ruby+programming+language"
#    CGI.escapeURIComponent("Ruby programming language")
#    #=> "Ruby%20programming%20language"
#
# See CGI::Escape module for methods list and their description.
class CGI
  module Escape; end
  include Escape
  extend Escape
  module EscapeExt; end # :nodoc:
end

# Web-related escape/unescape functionality.
module CGI::Escape
  @@accept_charset = Encoding::UTF_8 unless defined?(@@accept_charset)

# URL-encode a string into application/x-www-form-urlencoded.
 # Space characters (<tt>" "</tt>) are encoded with plus signs (<tt>"+"</tt>)
 # url_encoded_string = CGI.escape("'Stop!' said Fred")
 # # => "%27Stop%21%27+said+Fred"
 def escape(string)
 encoding = string.encoding
 buffer = string.b
 buffer.gsub!(/([^ a-zA-Z0-9_.\-~]+)/) do |m|
 '%' + m.unpack('H2' * m.bytesize).join('%').upcase
 end
 buffer.tr!(' ', '+')
 buffer.force_encoding(encoding)
 end

# URL-decode an application/x-www-form-urlencoded string with encoding(optional).
  #   string = CGI.unescape("%27Stop%21%27+said+Fred")
  #      # => "'Stop!' said Fred"
  def unescape(string, encoding = @@accept_charset)
    str = string.tr('+', ' ')
    str = str.b
    str.gsub!(/((?:%[0-9a-fA-F]{2})+)/) do |m|
      [m.delete('%')].pack('H*')
    end
    str.force_encoding(encoding)
    str.valid_encoding? ? str : str.force_encoding(string.encoding)
  end

# URL-encode a string following RFC 3986
 # Space characters (<tt>" "</tt>) are encoded with (<tt>"%20"</tt>)
 # url_encoded_string = CGI.escapeURIComponent("'Stop!' said Fred")
 # # => "%27Stop%21%27%20said%20Fred"
 def escapeURIComponent(string)
 encoding = string.encoding
 buffer = string.b
 buffer.gsub!(/([^a-zA-Z0-9_.\-~]+)/) do |m|
 '%' + m.unpack('H2' * m.bytesize).join('%').upcase
 end
 buffer.force_encoding(encoding)
 end
 alias escape_uri_component escapeURIComponent

# URL-decode a string following RFC 3986 with encoding(optional).
  #   string = CGI.unescapeURIComponent("%27Stop%21%27+said%20Fred")
  #      # => "'Stop!'+said Fred"
  def unescapeURIComponent(string, encoding = @@accept_charset)
    str = string.b
    str.gsub!(/((?:%[0-9a-fA-F]{2})+)/) do |m|
      [m.delete('%')].pack('H*')
    end
    str.force_encoding(encoding)
    str.valid_encoding? ? str : str.force_encoding(string.encoding)
  end

alias unescape_uri_component unescapeURIComponent

# The set of special characters and their escaped values
 TABLE_FOR_ESCAPE_HTML__ = { # :nodoc:
 "'" => '&#39;',
 '&' => '&amp;',
 '"' => '&quot;',
 '<' => '&lt;',
 '>' => '&gt;',
 }

# \Escape special characters in HTML, namely <tt>'&\"<></tt>
 # CGI.escapeHTML('Usage: foo "bar" <baz>')
 # # => "Usage: foo &quot;bar&quot; &lt;baz&gt;"
 def escapeHTML(string)
 enc = string.encoding
 unless enc.ascii_compatible?
 if enc.dummy?
 origenc = enc
 enc = Encoding::Converter.asciicompat_encoding(enc)
 string = enc ? string.encode(enc) : string.b
 end
 table = Hash[TABLE_FOR_ESCAPE_HTML__.map {|pair|pair.map {|s|s.encode(enc)}}]
 string = string.gsub(/#{"['&\"<>]".encode(enc)}/, table)
 string.encode!(origenc) if origenc
 string
 else
 string = string.b
 string.gsub!(/['&\"<>]/, TABLE_FOR_ESCAPE_HTML__)
 string.force_encoding(enc)
 end
 end

# Unescape a string that has been HTML-escaped
 # CGI.unescapeHTML("Usage: foo &quot;bar&quot; &lt;baz&gt;")
 # # => "Usage: foo \"bar\" <baz>"
 def unescapeHTML(string)
 enc = string.encoding
 unless enc.ascii_compatible?
 if enc.dummy?
 origenc = enc
 enc = Encoding::Converter.asciicompat_encoding(enc)
 string = enc ? string.encode(enc) : string.b
 end
 string = string.gsub(Regexp.new('&(apos|amp|quot|gt|lt|#[0-9]+|#x[0-9A-Fa-f]+);'.encode(enc))) do
 case $1.encode(Encoding::US_ASCII)
 when 'apos' then "'".encode(enc)
 when 'amp' then '&'.encode(enc)
 when 'quot' then '"'.encode(enc)
 when 'gt' then '>'.encode(enc)
 when 'lt' then '<'.encode(enc)
 when /\A#0*(\d+)\z/ then $1.to_i.chr(enc)
 when /\A#x([0-9a-f]+)\z/i then $1.hex.chr(enc)
 end
 end
 string.encode!(origenc) if origenc
 return string
 end
 return string unless string.include? '&'
 charlimit = case enc
 when Encoding::UTF_8; 0x10ffff
 when Encoding::ISO_8859_1; 256
 else 128
 end
 string = string.b
 string.gsub!(/&(apos|amp|quot|gt|lt|\#[0-9]+|\#[xX][0-9A-Fa-f]+);/) do
 match = $1.dup
 case match
 when 'apos' then "'"
 when 'amp' then '&'
 when 'quot' then '"'
 when 'gt' then '>'
 when 'lt' then '<'
 when /\A#0*(\d+)\z/
 n = $1.to_i
 if n < charlimit
 n.chr(enc)
 else
 "&##{$1};"
 end
 when /\A#x([0-9a-f]+)\z/i
 n = $1.hex
 if n < charlimit
 n.chr(enc)
 else
 "&#x#{$1};"
 end
 else
 "&#{match};"
 end
 end
 string.force_encoding enc
 end

alias escape_html escapeHTML
  alias h escapeHTML

alias unescape_html unescapeHTML

# TruffleRuby runs the pure-Ruby variant faster, do not use the C extension there
  unless RUBY_ENGINE == 'truffleruby'
    begin
      require 'cgi/escape.so'
    rescue LoadError
    end
  end

# \Escape only the tags of certain HTML elements in +string+.
 #
 # Takes an element or elements or array of elements. Each element
 # is specified by the name of the element, without angle brackets.
 # This matches both the start and the end tag of that element.
 # The attribute list of the open tag will also be escaped (for
 # instance, the double-quotes surrounding attribute values).
 #
 # print CGI.escapeElement(' <A HREF="url"></A>', "A", "IMG")
 # # " &lt;A HREF=&quot;url&quot;&gt;&lt;/A&gt"
 #
 # print CGI.escapeElement(' <A HREF="url"></A>', ["A", "IMG"])
 # # " &lt;A HREF=&quot;url&quot;&gt;&lt;/A&gt"
 def escapeElement(string, *elements)
 elements = elements[0] if elements[0].kind_of?(Array)
 unless elements.empty?
 string.gsub(/<\/?(?:#{elements.join("|")})\b[^<>]*+>?/im) do
 CGI.escapeHTML($&)
 end
 else
 string
 end
 end

# Undo escaping such as that done by CGI.escapeElement
 #
 # print CGI.unescapeElement(
 # CGI.escapeHTML(' <A HREF="url"></A>'), "A", "IMG")
 # # "&lt;BR&gt;<A HREF="url"></A>"
 #
 # print CGI.unescapeElement(
 # CGI.escapeHTML(' <A HREF="url"></A>'), ["A", "IMG"])
 # # "&lt;BR&gt;<A HREF="url"></A>"
 def unescapeElement(string, *elements)
 elements = elements[0] if elements[0].kind_of?(Array)
 unless elements.empty?
 string.gsub(/&lt;\/?(?:#{elements.join("|")})\b(?>[^&]+|&(?![gl]t;)\w+;)*(?:&gt;)?/im) do
 unescapeHTML($&)
 end
 else
 string
 end
 end

alias escape_element escapeElement

alias unescape_element unescapeElement

end

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