Class: SvgOptimizer

Inherits:
Object
  • Object
show all
Defined in:
lib/svgo.rb

Instance Method Summary collapse

Constructor Details

#initialize(options = SvgoOptions.new) {|options| ... } ⇒ SvgOptimizer

Returns a new instance of SvgOptimizer.

Yields:

  • (options) 


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# File 'lib/svgo.rb', line 113

def initialize(options=SvgoOptions.new)
    yield options if block_given?
    if options.is_a? SvgoOptions
        @options = options.get_options
    else
        @options = options
    end

    runtime = @options.delete "runtime"
    unless runtime
        # therubyracer is a first choice for execjs but its libv8 is too
        # old for the svgo library and its dependencies.
        runtimes = [
            # MacOS only system component
            ExecJS::Runtimes::JavaScriptCore,
            ExecJS::Runtimes::MiniRacer,
            ExecJS::Runtimes::Node
        ]
        runtime = runtimes.select {|r| r.available?}.first
        unless runtime
            raise ExecJS::RuntimeUnavailable.new(
                "No supported runtime available please install " \
                "`mini_racer` or `NodeJS`."
            )
        end
    end
    ExecJS.runtime = runtime
    if not @options[:plugins]
        @options[:plugins] = PLUGINS_DEFAULT
    end
    if @options[:plugins].is_a? Array
        @options[:plugins] = @options[:plugins].map {|p| [p, true]}.to_h
    end
    svgo_js = File.expand_path("../../svgo-js/svgo-built.js", __FILE__)
    svgo_module = File.open(svgo_js, "r:utf-8", &:read)
    @context = ExecJS.compile(svgo_module)
end

Instance Method Details

#optimize(svg_data) ⇒ Object 



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# File 'lib/svgo.rb', line 151

def optimize(svg_data)
    result = @context.call("svgo", @options.to_json, svg_data.to_s)
    if not result
        raise StandardError.new("Bad response from JavaScript runtime.")
    end
    if result['errors'].length > 0
        if result['errors'].length > 1
            err = %Q(Errors occurred: \n - #{result['errors'].join("\n - s")})
        else
            err = "An error occurred: #{result['errors'][0]}"
        end
        raise StandardError.new(err)
    end
    result
end

#optimize_file(svg_file) ⇒ Object 



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# File 'lib/svgo.rb', line 167

def optimize_file(svg_file)
    optimize(File.read(svg_file))
end