Sha256: 12c70e08fa4d44cb14329ed42d7d83313e3ad7ca97cc6a6059ca4f9ff0d94da4
Contents?: true
Size: 1.89 KB
Versions: 9
Compression:
Stored size: 1.89 KB
Contents
begin
require 'md5'
rescue LoadError
require 'digest/md5'
end
class Rack::PageSpeed::Filters::CombineJavaScripts < Rack::PageSpeed::Filter
requires_store
name 'combine_javascripts'
priority 8
def execute! document
nodes = document.css('script[src]')
return false unless nodes.count > 0
groups = group_siblings topmost_of_sequence(nodes)
groups.each do |group|
save group
merged = merge group, document
group.first.before merged
group.map { |node| node.remove }
end
end
private
def save nodes
contents = nodes.map { |node| file_for(node).read rescue "" }.join(';')
nodes_id = unique_id nodes
@options[:store]["#{nodes_id}.js"] = contents
end
def merge nodes, document
nodes_id = unique_id nodes
node = Nokogiri::XML::Node.new 'script', document
node['src'] = "/rack-pagespeed-#{nodes_id}.js"
node
end
def local_script? node
node.name == 'script' and file_for(node)
end
def topmost_of_sequence nodes
result = []
nodes.each do |node|
_previous, _next = node.previous_sibling, node.next_sibling
if _previous && local_script?(_previous) &&
(!_next || !file_for(_next))
result << node
end
end
result
end
def unique_id nodes
return Digest::MD5.hexdigest nodes.map { |node|
file = file_for node
next unless file
file.mtime.to_i.to_s + file.read
}.join unless @options[:hash]
@options[:hash].each do |urls, hash|
next unless (nodes.map { |node| node['src'] } & urls).length == urls.length
return hash
end
end
def group_siblings nodes
nodes.inject([]) do |result, node|
group, current = [], node
group << node
while previous = current.previous_sibling and local_script?(previous)
current = previous
group.unshift current
end
result << group
end
end
end
Version data entries
9 entries across 9 versions & 2 rubygems