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class CGI
# URL-encode a string.
# url_encoded_string = CGI::escape("'Stop!' said Fred")
# # => "%27Stop%21%27+said+Fred"
def CGI::escape(string)
string.gsub(/([^ a-zA-Z0-9_.-]+)/) do
'%' + $1.unpack('H2' * $1.bytesize).join('%').upcase
end.tr(' ', '+')
end
# URL-decode a string.
# string = CGI::unescape("%27Stop%21%27+said+Fred")
# # => "'Stop!' said Fred"
def CGI::unescape(string)
enc = string.encoding
string.tr('+', ' ').gsub(/((?:%[0-9a-fA-F]{2})+)/) do
[$1.delete('%')].pack('H*').force_encoding(enc)
end
end
TABLE_FOR_ESCAPE_HTML__ = {
'&' => '&',
'"' => '"',
'<' => '<',
'>' => '>',
}
# Escape special characters in HTML, namely &\"<>
# CGI::escapeHTML('Usage: foo "bar" <baz>')
# # => "Usage: foo "bar" <baz>"
def CGI::escapeHTML(string)
string.gsub(/[&\"<>]/, TABLE_FOR_ESCAPE_HTML__)
end
# Unescape a string that has been HTML-escaped
# CGI::unescapeHTML("Usage: foo "bar" <baz>")
# # => "Usage: foo \"bar\" <baz>"
def CGI::unescapeHTML(string)
enc = string.encoding
if [Encoding::UTF_16BE, Encoding::UTF_16LE, Encoding::UTF_32BE, Encoding::UTF_32LE].include?(enc)
return string.gsub(Regexp.new('&(amp|quot|gt|lt|#[0-9]+|#x[0-9A-Fa-f]+);'.encode(enc))) do
case $1.encode("US-ASCII")
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
end
asciicompat = Encoding.compatible?(string, "a")
string.gsub(/&(amp|quot|gt|lt|\#[0-9]+|\#x[0-9A-Fa-f]+);/) do
match = $1.dup
case match
when 'amp' then '&'
when 'quot' then '"'
when 'gt' then '>'
when 'lt' then '<'
when /\A#0*(\d+)\z/
n = $1.to_i
if enc == Encoding::UTF_8 or
enc == Encoding::ISO_8859_1 && n < 256 or
asciicompat && n < 128
n.chr(enc)
else
"&##{$1};"
end
when /\A#x([0-9a-f]+)\z/i
n = $1.hex
if enc == Encoding::UTF_8 or
enc == Encoding::ISO_8859_1 && n < 256 or
asciicompat && n < 128
n.chr(enc)
else
"&#x#{$1};"
end
else
"&#{match};"
end
end
end
def CGI::escape_html(str)
escapeHTML(str)
end
def CGI::unescape_html(str)
unescapeHTML(str)
end
# Escape only the tags of certain HTML elements in +string+.
#
# Takes an element or elements or array of elements. Each element
# is specified by the name of the element, without angle brackets.
# This matches both the start and the end tag of that element.
# The attribute list of the open tag will also be escaped (for
# instance, the double-quotes surrounding attribute values).
#
# print CGI::escapeElement('<BR><A HREF="url"></A>', "A", "IMG")
# # "<BR><A HREF="url"></A>"
#
# print CGI::escapeElement('<BR><A HREF="url"></A>', ["A", "IMG"])
# # "<BR><A HREF="url"></A>"
def CGI::escapeElement(string, *elements)
elements = elements[0] if elements[0].kind_of?(Array)
unless elements.empty?
string.gsub(/<\/?(?:#{elements.join("|")})(?!\w)(?:.|\n)*?>/i) do
CGI::escapeHTML($&)
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 CGI::unescapeElement(string, *elements)
elements = elements[0] if elements[0].kind_of?(Array)
unless elements.empty?
string.gsub(/<\/?(?:#{elements.join("|")})(?!\w)(?:.|\n)*?>/i) do
CGI::unescapeHTML($&)
end
else
string
end
end
def CGI::escape_element(str)
escapeElement(str)
end
def CGI::unescape_element(str)
unescapeElement(str)
end
# 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 CGI::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 CGI::pretty(string, shift = " ")
lines = string.gsub(/(?!\A)<(?:.|\n)*?>/, "\n\\0").gsub(/<(?:.|\n)*?>(?!\n)/, "\\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
end
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