The set of special characters and their escaped values
URL-encode a string.
url_encoded_string = CGI.escape("'Stop!' said Fred") # => "%27Stop%21%27+said+Fred"
# File cgi/util.rb, line 11 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
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 cgi/util.rb, line 144 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 special characters in HTML, namely '&"<>
CGI.escapeHTML('Usage: foo "bar" <baz>') # => "Usage: foo "bar" <baz>"
# File cgi/util.rb, line 40 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
Synonym for #escapeElement
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 cgi/util.rb, line 206 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 = $1.dup start_pos = lines.rindex(/^\s*<#{element}/i, end_pos) lines[start_pos ... end_pos] = "__" + lines[start_pos ... end_pos].gsub(/\n(?!\z)/, "\n" + shift) + "__" end lines.gsub(/^((?:#{Regexp::quote(shift)})*)__(?=<\/?\w)/, '\1') end
Format a Time
object as a String using the format specified by
RFC 1123.
CGI.rfc1123_date(Time.now) # Sat, 01 Jan 2000 00:00:00 GMT
# File cgi/util.rb, line 185 def rfc1123_date(time) time.getgm.strftime("%a, %d %b %Y %T GMT") end
URL-decode a string with encoding(optional).
string = CGI.unescape("%27Stop%21%27+said+Fred") # => "'Stop!' said Fred"
# File cgi/util.rb, line 21 def unescape(string,encoding=@@accept_charset) str=string.tr('+', ' ').b.gsub(/((?:%[0-9a-fA-F]{2})+)/) do |m| [m.delete('%')].pack('H*') end.force_encoding(encoding) str.valid_encoding? ? str : str.force_encoding(string.encoding) end
Undo escaping such as that done by #escapeElement
print CGI.unescapeElement( CGI.escapeHTML('<BR><A HREF="url"></A>'), "A", "IMG") # "<BR><A HREF="url"></A>" print CGI.unescapeElement( CGI.escapeHTML('<BR><A HREF="url"></A>'), ["A", "IMG"]) # "<BR><A HREF="url"></A>"
# File cgi/util.rb, line 164 def unescapeElement(string, *elements) elements = elements[0] if elements[0].kind_of?(Array) unless elements.empty? string.gsub(/<\/?(?:#{elements.join("|")})(?!\w)(?:.|\n)*?>/i) do unescapeHTML($&) end else string end end
Unescape a string that has been HTML-escaped
CGI.unescapeHTML("Usage: foo "bar" <baz>") # => "Usage: foo \"bar\" <baz>"
# File cgi/util.rb, line 67 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 #unescapeElement