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File Name : util.rb

# frozen_string_literal: true
class CGI
  module Util; end
  include Util
  extend Util
end
module CGI::Util
  @@accept_charset="UTF-8" unless defined?(@@accept_charset)
  # URL-encode a string.
  #   url_encoded_string = CGI.escape("'Stop!' said Fred")
  #      # => "%27Stop%21%27+said+Fred"
  def escape(string)
    encoding = string.encoding
    string.b.gsub(/([^ a-zA-Z0-9_.\-~]+)/) do |m|
      '%' + m.unpack('H2' * m.bytesize).join('%').upcase
    end.tr(' ', '+').force_encoding(encoding)
  end

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

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

# Escape special characters in HTML, namely '&\"<>
 # 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
 return string
 end
 string.gsub(/['&\"<>]/, TABLE_FOR_ESCAPE_HTML__)
 end

begin
    require 'cgi/escape'
  rescue LoadError
  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.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
 end

# Synonym for CGI.escapeHTML(str)
  alias escape_html escapeHTML

# Synonym for CGI.unescapeHTML(str)
  alias unescape_html unescapeHTML

# 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("|")})(?!\w)(?:.|\n)*?>/i) 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("|")})(?!\w)(?:.|\n)*?&gt;/i) do
 unescapeHTML($&)
 end
 else
 string
 end
 end

# Synonym for CGI.escapeElement(str)
  alias escape_element escapeElement

# Synonym for CGI.unescapeElement(str)
  alias unescape_element unescapeElement

# Abbreviated day-of-week names specified by RFC 822
  RFC822_DAYS = %w[ Sun Mon Tue Wed Thu Fri Sat ]

# Abbreviated month names specified by RFC 822
  RFC822_MONTHS = %w[ Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec ]

# Format a +Time+ object as a String using the format specified by RFC 1123.
  #
  #   CGI.rfc1123_date(Time.now)
  #     # Sat, 01 Jan 2000 00:00:00 GMT
  def rfc1123_date(time)
    t = time.clone.gmtime
    return format("%s, %.2d %s %.4d %.2d:%.2d:%.2d GMT",
                  RFC822_DAYS[t.wday], t.day, RFC822_MONTHS[t.month-1], t.year,
                  t.hour, t.min, t.sec)
  end

# Prettify (indent) an HTML string.
 #
 # +string+ is the HTML string to indent. +shift+ is the indentation
 # unit to use; it defaults to two spaces.
 #
 # print CGI.pretty("<HTML><BODY></BODY></HTML>")
 # # <HTML>
 # # <BODY>
 # # </BODY>
 # # </HTML>
 #
 # print CGI.pretty("<HTML><BODY></BODY></HTML>", "\t")
 # # <HTML>
 # # <BODY>
 # # </BODY>
 # # </HTML>
 #
 def pretty(string, shift = " ")
 lines = string.gsub(/(?!\A)<.*?>/m, "\n\\0").gsub(/<.*?>(?!\n)/m, "\\0\n")
 end_pos = 0
 while end_pos = lines.index(/^<\/(\w+)/, end_pos)
 element = $1.dup
 start_pos = lines.rindex(/^\s*<#{element}/i, end_pos)
 lines[start_pos ... end_pos] = "__" + lines[start_pos ... end_pos].gsub(/\n(?!\z)/, "\n" + shift) + "__"
 end
 lines.gsub(/^((?:#{Regexp::quote(shift)})*)__(?=<\/?\w)/, '\1')
 end

alias h escapeHTML
end

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util.rb	text/x-ruby	6.98 KB	root/linksafe	0644	2024-06-26 01:55:18