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require 'erb'
class ERB
undef :set_eoutvar
def set_eoutvar(compiler, eoutvar = '_erbout')
compiler.put_cmd = "#{eoutvar}.safe_concat"
compiler.insert_cmd = "#{eoutvar}.safe_concat"
cmd = []
cmd.push "#{eoutvar} = ActiveSupport::SafeBuffer.new"
compiler.pre_cmd = cmd
cmd = []
cmd.push(eoutvar)
compiler.post_cmd = cmd
end
module Util
HTML_ESCAPE = { '&' => '&', '>' => '>', '<' => '<', '"' => '"' }
JSON_ESCAPE = { '&' => '\u0026', '>' => '\u003E', '<' => '\u003C' }
# A utility method for escaping HTML tag characters.
# This method is also aliased as <tt>h</tt>.
#
# In your ERb templates, use this method to escape any unsafe content. For example:
# <%=h @person.name %>
#
# ==== Example:
# puts html_escape("is a > 0 & a < 10?")
# # => is a > 0 & a < 10?
def html_escape(s)
s = s.to_s
if s.html_safe?
s
else
s.to_s.gsub(/&/, "&").gsub(/\"/, """).gsub(/>/, ">").gsub(/</, "<").html_safe
end
end
undef :h
alias h html_escape
module_function :html_escape
module_function :h
# A utility method for escaping HTML entities in JSON strings.
# This method is also aliased as <tt>j</tt>.
#
# In your ERb templates, use this method to escape any HTML entities:
# <%=j @person.to_json %>
#
# ==== Example:
# puts json_escape("is a > 0 & a < 10?")
# # => is a \u003E 0 \u0026 a \u003C 10?
def json_escape(s)
s.to_s.gsub(/[&"><]/) { |special| JSON_ESCAPE[special] }
end
alias j json_escape
module_function :j
module_function :json_escape
end
end
class Object
def html_safe?
false
end
end
class Fixnum
def html_safe?
true
end
end
module ActiveSupport #:nodoc:
class SafeBuffer < String
alias safe_concat concat
def concat(value)
if value.html_safe?
super(value)
else
super(ERB::Util.h(value))
end
end
def +(other)
dup.concat(other)
end
def <<(value)
self.concat(value)
end
def html_safe?
true
end
def html_safe
self
end
def to_s
self
end
end
end
class String
def html_safe!
raise "Use html_safe with your strings instead of html_safe! See http://yehudakatz.com/2010/02/01/safebuffers-and-rails-3-0/ for the full story."
end
def html_safe
ActiveSupport::SafeBuffer.new(self)
end
end
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