124 lines
3.9 KiB
Ruby
124 lines
3.9 KiB
Ruby
require 'middleman-core/contracts'
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# 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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option :content_types, %w(application/javascript), 'Content types of resources that contain JS'
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option :inline_content_types, %w(text/html text/php), 'Content types of resources that contain inline JS'
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def ready
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# Setup Rack middleware to minify JS
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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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content_types: options[:content_types],
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inline_content_types: options[:inline_content_types]
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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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include Contracts
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INLINE_JS_REGEX = /(<script[^>]*>\s*(?:\/\/(?:(?:<!--)|(?:<!\[CDATA\[))\n)?)(.*?)((?:(?:\n\s*)?\/\/(?:(?:-->)|(?:\]\]>)))?\s*<\/script>)/m
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# Init
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# @param [Class] app
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# @param [Hash] options
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Contract RespondTo[:call], {
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ignore: ArrayOf[PATH_MATCHER],
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inline: Bool,
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compressor: Or[Proc, RespondTo[:to_proc], RespondTo[:compress]]
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} => Any
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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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@content_types = options[:content_types]
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@inline_content_types = options[:inline_content_types]
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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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type = headers['Content-Type'].try(:slice, /^[^;]*/)
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@path = env['PATH_INFO']
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minified = if @inline && minifiable_inline?(type)
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minify_inline(::Middleman::Util.extract_response_text(response))
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elsif minifiable?(type) && !ignore?(@path)
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minify(::Middleman::Util.extract_response_text(response))
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end
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if minified
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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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[status, headers, response]
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end
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private
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# Whether the path should be ignored
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# @param [String] path
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# @return [Boolean]
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def ignore?(path)
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@ignore.any? { |ignore| Middleman::Util.path_match(ignore, path) }
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end
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# Whether this type of content can be minified
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# @param [String, nil] content_type
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# @return [Boolean]
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def minifiable?(content_type)
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@content_types.include?(content_type)
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end
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# Whether this type of content contains inline content that can be minified
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# @param [String, nil] content_type
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# @return [Boolean]
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def minifiable_inline?(content_type)
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@inline_content_types.include?(content_type)
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end
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# Minify the content
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# @param [String] content
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# @return [String]
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def minify(content)
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@compressor.compress(content)
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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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content
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end
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# Detect and minify inline content
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# @param [String] content
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# @return [String]
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def minify_inline(content)
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content.gsub(INLINE_JS_REGEX) do |match|
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first = $1
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inline_content = $2
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last = $3
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# Only compress script tags that contain JavaScript (as opposed to
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# something like jQuery templates, identified with a "text/html" type).
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if first.include?('<script>') || first.include?('text/javascript')
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first + minify(inline_content) + 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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