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Significantly optimize regexp time of fix_textareas!

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The leading whitespace match and back reference added significant overhead in
certain cases, sometimes leading to render times taking minutes. In some cases,
the render time dropped from 2+ minutes to 200 milliseconds.

Closes #849
This commit is contained in:
Stan Hu 2015-07-16 09:12:24 -07:00 • committed by Norman Clarke
parent c89da381a0
commit bc2b9f186f
1 changed files with 4 additions and 4 deletions
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8
lib/haml/buffer.rb
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@ -273,16 +273,16 @@ module Haml
# @since Haml 4.0.1
# @private
def fix_textareas!(input)
pattern = /([ ]*)<(textarea)([^>]*)>(\n|&#x000A;)(.*?)(<\/\2>)/im
pattern = /<(textarea)([^>]*)>(\n|&#x000A;)(.*?)<\/textarea>/im
input.gsub!(pattern) do |s|
match = pattern.match(s)
content = match[5]
if match[4] == '&#x000A;'
content = match[4]
if match[3] == '&#x000A;'
content.sub!(/\A /, '&#x0020;')
else
content.sub!(/\A[ ]*/, '')
end
"#{match[1]}<#{match[2]}#{match[3]}>\n#{content}</#{match[2]}>"
"<#{match[1]}#{match[2]}>\n#{content}</#{match[1]}>"
end
end