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# frozen_string_literal: true
class CGI
module Util; end
include Util
extend Util
end
module CGI::Util
@@accept_charset = Encoding::UTF_8 unless defined?(@@accept_charset)
# URL-encode a string into application/x-www-form-urlencoded.
# Space characters (+" "+) are encoded with plus signs (+"+"+)
# 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 (+" "+) are encoded with (+"%20"+)
# url_encoded_string = CGI.escape("'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
# URL-decode a string following RFC 3986 with encoding(optional).
# string = CGI.unescape("%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
# The set of special characters and their escaped values
TABLE_FOR_ESCAPE_HTML__ = {
"'" => ''',
'&' => '&',
'"' => '"',
'<' => '<',
'>' => '>',
}
# Escape special characters in HTML, namely '&\"<>
# CGI.escapeHTML('Usage: foo "bar" <baz>')
# # => "Usage: foo "bar" <baz>"
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
begin
require 'cgi/escape'
rescue LoadError
end
# Unescape a string that has been HTML-escaped
# CGI.unescapeHTML("Usage: foo "bar" <baz>")
# # => "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#{$1};"
end
else
"&#{match};"
end
end
string.force_encoding enc
end
# Synonym for CGI.escapeHTML(str)
alias escape_html escapeHTML
# Synonym for CGI.unescapeHTML(str)
alias unescape_html unescapeHTML
# Escape only the tags of certain HTML elements in +string+.
#
# Takes an element or elements or array of elements. Each element
# is specified by the name of the element, without angle brackets.
# This matches both the start and the end tag of that element.
# The attribute list of the open tag will also be escaped (for
# instance, the double-quotes surrounding attribute values).
#
# print CGI.escapeElement('<BR><A HREF="url"></A>', "A", "IMG")
# # "<BR><A HREF="url"></A>"
#
# print CGI.escapeElement('<BR><A HREF="url"></A>', ["A", "IMG"])
# # "<BR><A HREF="url"></A>"
def escapeElement(string, *elements)
elements = elements[0] if elements[0].kind_of?(Array)
unless elements.empty?
string.gsub(/<\/?(?:#{elements.join("|")})(?!\w)(?:.|\n)*?>/i) do
CGI.escapeHTML($&)
end
else
string
end
end
# Undo escaping such as that done by CGI.escapeElement()
#
# print CGI.unescapeElement(
# CGI.escapeHTML('<BR><A HREF="url"></A>'), "A", "IMG")
# # "<BR><A HREF="url"></A>"
#
# print CGI.unescapeElement(
# CGI.escapeHTML('<BR><A HREF="url"></A>'), ["A", "IMG"])
# # "<BR><A HREF="url"></A>"
def unescapeElement(string, *elements)
elements = elements[0] if elements[0].kind_of?(Array)
unless elements.empty?
string.gsub(/<\/?(?:#{elements.join("|")})(?!\w)(?:.|\n)*?>/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
# 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)
time.getgm.strftime("%a, %d %b %Y %T GMT")
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