84 lines
2.7 KiB
Ruby
84 lines
2.7 KiB
Ruby
# Minify Javascript Extension
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class Middleman::Extensions::MinifyJavascript < ::Middleman::Extension
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option :inline, false, 'Whether to minify JS inline within HTML files'
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option :ignore, [], 'Patterns to avoid minifying'
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option :compressor, proc {
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require 'uglifier'
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::Uglifier.new
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}, 'Set the JS compressor to use.'
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def after_configuration
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# Setup Rack middleware to minify CSS
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app.use Rack, compressor: options[:compressor],
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ignore: Array(options[:ignore]) + [/\.min\./],
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inline: options[:inline]
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end
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# Rack middleware to look for JS and compress it
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class Rack
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# Init
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# @param [Class] app
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# @param [Hash] options
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def initialize(app, options={})
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@app = app
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@ignore = options.fetch(:ignore)
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@inline = options.fetch(:inline)
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@compressor = options.fetch(:compressor)
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@compressor = @compressor.to_proc if @compressor.respond_to? :to_proc
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@compressor = @compressor.call if @compressor.is_a? Proc
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end
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# Rack interface
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# @param [Rack::Environmemt] env
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# @return [Array]
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def call(env)
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status, headers, response = @app.call(env)
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path = env['PATH_INFO']
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begin
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if @inline && (path.end_with?('.html') || path.end_with?('.php'))
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uncompressed_source = ::Middleman::Util.extract_response_text(response)
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minified = minify_inline_content(uncompressed_source)
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headers['Content-Length'] = ::Rack::Utils.bytesize(minified).to_s
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response = [minified]
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elsif path.end_with?('.js') && @ignore.none? { |ignore| Middleman::Util.path_match(ignore, path) }
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uncompressed_source = ::Middleman::Util.extract_response_text(response)
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minified = @compressor.compress(uncompressed_source)
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headers['Content-Length'] = ::Rack::Utils.bytesize(minified).to_s
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response = [minified]
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end
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rescue ExecJS::ProgramError => e
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warn "WARNING: Couldn't compress JavaScript in #{path}: #{e.message}"
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end
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[status, headers, response]
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end
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private
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def minify_inline_content(uncompressed_source)
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uncompressed_source.gsub(/(<script[^>]*>\s*(?:\/\/(?:(?:<!--)|(?:<!\[CDATA\[))\n)?)(.*?)((?:(?:\n\s*)?\/\/(?:(?:-->)|(?:\]\]>)))?\s*<\/script>)/m) do |match|
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first = $1
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javascript = $2
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last = $3
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# Only compress script tags that contain JavaScript (as opposed
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# to something like jQuery templates, identified with a "text/html"
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# type.
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if first =~ /<script>/ || first.include?('text/javascript')
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minified_js = @compressor.compress(javascript)
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first << minified_js << last
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else
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match
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end
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end
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end
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end
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end
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