The set of special characters and their escaped values
Abbreviated day-of-week names specified by RFC 822
Abbreviated month names specified by RFC 822
# File tmp/rubies/ruby-2.5.9/lib/cgi/util.rb, line 12
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-encode a string.
url_encoded_string = CGI::escape("'Stop!' said Fred") # => "%27Stop%21%27+said+Fred"
# File tmp/rubies/ruby-2.5.9/lib/cgi/util.rb, line 140
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
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>"
# File tmp/rubies/ruby-2.5.9/lib/cgi/util.rb, line 41
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
Escape special characters in HTML, namely ‘&"<>
CGI::escapeHTML('Usage: foo "bar" <baz>') # => "Usage: foo "bar" <baz>"
# File tmp/rubies/ruby-2.5.9/lib/cgi/util.rb, line 211
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 = $1.dup
start_pos = lines.rindex(/^\s*<#{element}/i, end_pos)
lines[start_pos ... end_pos] = "__" + lines[start_pos ... end_pos].gsub(/\n(?!\z)/, "\n" + shift) + "__"
end
lines.gsub(/^((?:#{Regexp::quote(shift)})*)__(?=<\/?\w)/, '\1')
end
Prettify (indent) an HTML string.
string
is the HTML string to indent. shift
is the indentation unit to use; it defaults to two spaces.
print CGI::pretty("<HTML><BODY></BODY></HTML>") # <HTML> # <BODY> # </BODY> # </HTML> print CGI::pretty("<HTML><BODY></BODY></HTML>", "\t") # <HTML> # <BODY> # </BODY> # </HTML>
# File tmp/rubies/ruby-2.5.9/lib/cgi/util.rb, line 187
def rfc1123_date(time)
t = time.clone.gmtime
return format("%s, %.2d %s %.4d %.2d:%.2d:%.2d GMT",
RFC822_DAYS[t.wday], t.day, RFC822_MONTHS[t.month-1], t.year,
t.hour, t.min, t.sec)
end
Format a Time
object as a String using the format specified by RFC 1123.
CGI::rfc1123_date(Time.now) # Sat, 01 Jan 2000 00:00:00 GMT
# File tmp/rubies/ruby-2.5.9/lib/cgi/util.rb, line 22
def unescape(string,encoding=@@accept_charset)
str=string.tr('+', ' ').b.gsub(/((?:%[0-9a-fA-F]{2})+)/) do |m|
[m.delete('%')].pack('H*')
end.force_encoding(encoding)
str.valid_encoding? ? str : str.force_encoding(string.encoding)
end
URL-decode a string with encoding(optional).
string = CGI::unescape("%27Stop%21%27+said+Fred") # => "'Stop!' said Fred"
# File tmp/rubies/ruby-2.5.9/lib/cgi/util.rb, line 160
def unescapeElement(string, *elements)
elements = elements[0] if elements[0].kind_of?(Array)
unless elements.empty?
string.gsub(/<\/?(?:#{elements.join("|")})(?!\w)(?:.|\n)*?>/i) do
unescapeHTML($&)
end
else
string
end
end
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>"
# File tmp/rubies/ruby-2.5.9/lib/cgi/util.rb, line 65
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
Unescape a string that has been HTML-escaped
CGI::unescapeHTML("Usage: foo "bar" <baz>") # => "Usage: foo \"bar\" <baz>"