mirror of
https://github.com/ruby/ruby.git
synced 2022-11-09 12:17:21 -05:00
219 lines
6.7 KiB
Ruby
219 lines
6.7 KiB
Ruby
# frozen_string_literal: true
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class CGI
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module Util; end
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include Util
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extend Util
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end
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module CGI::Util
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@@accept_charset="UTF-8" unless defined?(@@accept_charset)
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# URL-encode a string.
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# url_encoded_string = CGI.escape("'Stop!' said Fred")
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# # => "%27Stop%21%27+said+Fred"
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def escape(string)
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encoding = string.encoding
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string.b.gsub(/([^ a-zA-Z0-9_.\-~]+)/) do |m|
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'%' + m.unpack('H2' * m.bytesize).join('%').upcase
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end.tr(' ', '+').force_encoding(encoding)
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end
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# URL-decode a string with encoding(optional).
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# string = CGI.unescape("%27Stop%21%27+said+Fred")
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# # => "'Stop!' said Fred"
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def unescape(string,encoding=@@accept_charset)
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str=string.tr('+', ' ').b.gsub(/((?:%[0-9a-fA-F]{2})+)/) do |m|
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[m.delete('%')].pack('H*')
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end.force_encoding(encoding)
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str.valid_encoding? ? str : str.force_encoding(string.encoding)
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end
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# The set of special characters and their escaped values
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TABLE_FOR_ESCAPE_HTML__ = {
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"'" => ''',
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'&' => '&',
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'"' => '"',
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'<' => '<',
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'>' => '>',
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}
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# Escape special characters in HTML, namely '&\"<>
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# CGI.escapeHTML('Usage: foo "bar" <baz>')
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# # => "Usage: foo "bar" <baz>"
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def escapeHTML(string)
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enc = string.encoding
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unless enc.ascii_compatible?
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if enc.dummy?
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origenc = enc
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enc = Encoding::Converter.asciicompat_encoding(enc)
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string = enc ? string.encode(enc) : string.b
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end
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table = Hash[TABLE_FOR_ESCAPE_HTML__.map {|pair|pair.map {|s|s.encode(enc)}}]
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string = string.gsub(/#{"['&\"<>]".encode(enc)}/, table)
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string.encode!(origenc) if origenc
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string
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else
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string = string.b
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string.gsub!(/['&\"<>]/, TABLE_FOR_ESCAPE_HTML__)
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string.force_encoding(enc)
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end
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end
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begin
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require 'cgi/escape'
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rescue LoadError
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end
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# Unescape a string that has been HTML-escaped
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# CGI.unescapeHTML("Usage: foo "bar" <baz>")
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# # => "Usage: foo \"bar\" <baz>"
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def unescapeHTML(string)
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enc = string.encoding
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unless enc.ascii_compatible?
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if enc.dummy?
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origenc = enc
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enc = Encoding::Converter.asciicompat_encoding(enc)
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string = enc ? string.encode(enc) : string.b
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end
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string = string.gsub(Regexp.new('&(apos|amp|quot|gt|lt|#[0-9]+|#x[0-9A-Fa-f]+);'.encode(enc))) do
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case $1.encode(Encoding::US_ASCII)
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when 'apos' then "'".encode(enc)
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when 'amp' then '&'.encode(enc)
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when 'quot' then '"'.encode(enc)
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when 'gt' then '>'.encode(enc)
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when 'lt' then '<'.encode(enc)
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when /\A#0*(\d+)\z/ then $1.to_i.chr(enc)
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when /\A#x([0-9a-f]+)\z/i then $1.hex.chr(enc)
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end
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end
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string.encode!(origenc) if origenc
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return string
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end
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return string unless string.include? '&'
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charlimit = case enc
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when Encoding::UTF_8; 0x10ffff
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when Encoding::ISO_8859_1; 256
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else 128
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end
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string = string.b
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string.gsub!(/&(apos|amp|quot|gt|lt|\#[0-9]+|\#[xX][0-9A-Fa-f]+);/) do
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match = $1.dup
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case match
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when 'apos' then "'"
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when 'amp' then '&'
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when 'quot' then '"'
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when 'gt' then '>'
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when 'lt' then '<'
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when /\A#0*(\d+)\z/
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n = $1.to_i
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if n < charlimit
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n.chr(enc)
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else
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"&##{$1};"
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end
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when /\A#x([0-9a-f]+)\z/i
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n = $1.hex
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if n < charlimit
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n.chr(enc)
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else
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"&#x#{$1};"
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end
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else
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"&#{match};"
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end
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end
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string.force_encoding enc
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end
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# Synonym for CGI.escapeHTML(str)
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alias escape_html escapeHTML
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# Synonym for CGI.unescapeHTML(str)
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alias unescape_html unescapeHTML
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# Escape only the tags of certain HTML elements in +string+.
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#
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# Takes an element or elements or array of elements. Each element
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# is specified by the name of the element, without angle brackets.
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# This matches both the start and the end tag of that element.
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# The attribute list of the open tag will also be escaped (for
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# instance, the double-quotes surrounding attribute values).
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#
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# print CGI.escapeElement('<BR><A HREF="url"></A>', "A", "IMG")
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# # "<BR><A HREF="url"></A>"
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#
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# print CGI.escapeElement('<BR><A HREF="url"></A>', ["A", "IMG"])
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# # "<BR><A HREF="url"></A>"
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def escapeElement(string, *elements)
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elements = elements[0] if elements[0].kind_of?(Array)
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unless elements.empty?
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string.gsub(/<\/?(?:#{elements.join("|")})(?!\w)(?:.|\n)*?>/i) do
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CGI.escapeHTML($&)
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end
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else
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string
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end
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end
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# Undo escaping such as that done by CGI.escapeElement()
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#
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# print CGI.unescapeElement(
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# CGI.escapeHTML('<BR><A HREF="url"></A>'), "A", "IMG")
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# # "<BR><A HREF="url"></A>"
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#
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# print CGI.unescapeElement(
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# CGI.escapeHTML('<BR><A HREF="url"></A>'), ["A", "IMG"])
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# # "<BR><A HREF="url"></A>"
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def unescapeElement(string, *elements)
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elements = elements[0] if elements[0].kind_of?(Array)
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unless elements.empty?
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string.gsub(/<\/?(?:#{elements.join("|")})(?!\w)(?:.|\n)*?>/i) do
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unescapeHTML($&)
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end
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else
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string
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end
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end
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# Synonym for CGI.escapeElement(str)
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alias escape_element escapeElement
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# Synonym for CGI.unescapeElement(str)
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alias unescape_element unescapeElement
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# Format a +Time+ object as a String using the format specified by RFC 1123.
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#
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# CGI.rfc1123_date(Time.now)
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# # Sat, 01 Jan 2000 00:00:00 GMT
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def rfc1123_date(time)
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time.getgm.strftime("%a, %d %b %Y %T GMT")
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end
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# Prettify (indent) an HTML string.
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#
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# +string+ is the HTML string to indent. +shift+ is the indentation
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# unit to use; it defaults to two spaces.
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#
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# print CGI.pretty("<HTML><BODY></BODY></HTML>")
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# # <HTML>
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# # <BODY>
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# # </BODY>
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# # </HTML>
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#
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# print CGI.pretty("<HTML><BODY></BODY></HTML>", "\t")
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# # <HTML>
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# # <BODY>
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# # </BODY>
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# # </HTML>
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#
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def pretty(string, shift = " ")
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lines = string.gsub(/(?!\A)<.*?>/m, "\n\\0").gsub(/<.*?>(?!\n)/m, "\\0\n")
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end_pos = 0
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while end_pos = lines.index(/^<\/(\w+)/, end_pos)
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element = $1.dup
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start_pos = lines.rindex(/^\s*<#{element}/i, end_pos)
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lines[start_pos ... end_pos] = "__" + lines[start_pos ... end_pos].gsub(/\n(?!\z)/, "\n" + shift) + "__"
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end
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lines.gsub(/^((?:#{Regexp::quote(shift)})*)__(?=<\/?\w)/, '\1')
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end
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alias h escapeHTML
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end
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