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# frozen_string_literal: true
require "action_view/helpers/tag_helper"
module ActionView
module Helpers #:nodoc:
module JavaScriptHelper
JS_ESCAPE_MAP = {
'\\' => '\\\\',
"</" => '<\/',
"\r\n" => '\n',
"\n" => '\n',
"\r" => '\n',
'"' => '\\"',
"'" => "\\'"
}
JS_ESCAPE_MAP[(+"\342\200\250").force_encoding(Encoding::UTF_8).encode!] = "
"
JS_ESCAPE_MAP[(+"\342\200\251").force_encoding(Encoding::UTF_8).encode!] = "
"
# Escapes carriage returns and single and double quotes for JavaScript segments.
#
# Also available through the alias j(). This is particularly helpful in JavaScript
# responses, like:
#
# $('some_element').replaceWith('<%= j render 'some/element_template' %>');
def escape_javascript(javascript)
javascript = javascript.to_s
if javascript.empty?
result = ""
else
result = javascript.gsub(/(\\|<\/|\r\n|\342\200\250|\342\200\251|[\n\r"'])/u) { |match| JS_ESCAPE_MAP[match] }
end
javascript.html_safe? ? result.html_safe : result
end
alias_method :j, :escape_javascript
# Returns a JavaScript tag with the +content+ inside. Example:
# javascript_tag "alert('All is good')"
#
# Returns:
# <script>
# //<![CDATA[
# alert('All is good')
# //]]>
# </script>
#
# +html_options+ may be a hash of attributes for the <tt>\<script></tt>
# tag.
#
# javascript_tag "alert('All is good')", defer: 'defer'
#
# Returns:
# <script defer="defer">
# //<![CDATA[
# alert('All is good')
# //]]>
# </script>
#
# Instead of passing the content as an argument, you can also use a block
# in which case, you pass your +html_options+ as the first parameter.
#
# <%= javascript_tag defer: 'defer' do -%>
# alert('All is good')
# <% end -%>
#
# If you have a content security policy enabled then you can add an automatic
# nonce value by passing <tt>nonce: true</tt> as part of +html_options+. Example:
#
# <%= javascript_tag nonce: true do -%>
# alert('All is good')
# <% end -%>
def javascript_tag(content_or_options_with_block = nil, html_options = {}, &block)
content =
if block_given?
html_options = content_or_options_with_block if content_or_options_with_block.is_a?(Hash)
capture(&block)
else
content_or_options_with_block
end
if html_options[:nonce] == true
html_options[:nonce] = content_security_policy_nonce
end
content_tag("script".freeze, javascript_cdata_section(content), html_options)
end
def javascript_cdata_section(content) #:nodoc:
"\n//#{cdata_section("\n#{content}\n//")}\n".html_safe
end
end
end
end
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