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e76a843505
content_tag's first argument is will generate a string with an html tag so `:a` will generate: `<a></a>`. When this happens, the symbol is implicitly `to_s`-d so a new string is allocated. We can get around that by using a frozen string instead which This change buys us 74,236 bytes of memory and 1,855 fewer objects per request.
81 lines
2.5 KiB
Ruby
81 lines
2.5 KiB
Ruby
require 'action_view/helpers/tag_helper'
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module ActionView
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module Helpers
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module JavaScriptHelper
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JS_ESCAPE_MAP = {
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'\\' => '\\\\',
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'</' => '<\/',
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"\r\n" => '\n',
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"\n" => '\n',
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"\r" => '\n',
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'"' => '\\"',
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"'" => "\\'"
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}
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JS_ESCAPE_MAP["\342\200\250".force_encoding(Encoding::UTF_8).encode!] = '
'
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JS_ESCAPE_MAP["\342\200\251".force_encoding(Encoding::UTF_8).encode!] = '
'
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# Escapes carriage returns and single and double quotes for JavaScript segments.
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#
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# Also available through the alias j(). This is particularly helpful in JavaScript
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# responses, like:
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#
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# $('some_element').replaceWith('<%= j render 'some/element_template' %>');
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def escape_javascript(javascript)
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if javascript
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result = javascript.gsub(/(\\|<\/|\r\n|\342\200\250|\342\200\251|[\n\r"'])/u) {|match| JS_ESCAPE_MAP[match] }
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javascript.html_safe? ? result.html_safe : result
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else
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''
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end
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end
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alias_method :j, :escape_javascript
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# Returns a JavaScript tag with the +content+ inside. Example:
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# javascript_tag "alert('All is good')"
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#
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# Returns:
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# <script>
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# //<![CDATA[
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# alert('All is good')
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# //]]>
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# </script>
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#
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# +html_options+ may be a hash of attributes for the <tt>\<script></tt>
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# tag.
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#
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# javascript_tag "alert('All is good')", defer: 'defer'
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#
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# Returns:
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# <script defer="defer">
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# //<![CDATA[
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# alert('All is good')
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# //]]>
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# </script>
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#
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# Instead of passing the content as an argument, you can also use a block
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# in which case, you pass your +html_options+ as the first parameter.
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#
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# <%= javascript_tag defer: 'defer' do -%>
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# alert('All is good')
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# <% end -%>
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def javascript_tag(content_or_options_with_block = nil, html_options = {}, &block)
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content =
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if block_given?
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html_options = content_or_options_with_block if content_or_options_with_block.is_a?(Hash)
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capture(&block)
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else
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content_or_options_with_block
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end
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content_tag("script".freeze, javascript_cdata_section(content), html_options)
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end
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def javascript_cdata_section(content) #:nodoc:
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"\n//#{cdata_section("\n#{content}\n//")}\n".html_safe
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end
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end
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end
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end
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