The Closure::Compiler is a basic wrapper around the actual JAR. There's not much to see here.
When you create a Compiler, pass in the flags and options.
# File lib/closure/compiler.rb, line 16 def initialize(options={}) @java = options.delete(:java) || JAVA_COMMAND @jar = options.delete(:jar_file) || COMPILER_JAR @options = serialize_options(DEFAULT_OPTIONS.merge(options)) end
Can compile a JavaScript string or open IO object. Returns the compiled JavaScript as a string or yields an IO object containing the response to a block, for streaming.
# File lib/closure/compiler.rb, line 25 def compile(io) tempfile = Tempfile.new('closure_compiler') if io.respond_to? :read while buffer = io.read(4096) do tempfile.write(buffer) end else tempfile.write(io.to_s) end tempfile.flush begin result = %x#{command} --js #{tempfile.path} 2>&1` rescue Exception raise Error, "compression failed: #{result}" ensure tempfile.close! end unless $?.exitstatus.zero? raise Error, result end yield(StringIO.new(result)) if block_given? result end
# File lib/closure/compiler.rb, line 66 def command [@java, '-jar', "\"#{@jar}\"", @options].flatten.join(' ') end
Serialize hash options to the command-line format.
# File lib/closure/compiler.rb, line 56 def serialize_options(options) options.map do |k, v| if (v.is_a?(Array)) v.map {|v2| ["--#{k}", v2.to_s]} else ["--#{k}", v.to_s] end end.flatten end