Module: Sass::Script::Functions

Defined in:
lib/compass-recipes/sass_extensions/_error.rb,
lib/compass-recipes/sass_extensions/background_noise.rb,
lib/compass-recipes/sass_extensions/gravatar.rb,
lib/compass-recipes/sass_extensions.rb

Overview

Helper to throw error message

Instance Method Summary collapse

Instance Method Details

#background_noise(kwargs = {}) ⇒ Object 



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# File 'lib/compass-recipes/sass_extensions/background_noise.rb', line 12

def background_noise(kwargs = {})
    opts = {}
    Sass::Util.map_hash({
     "intensity"  => [0..1,          "",   :Number, Sass::Script::Number.new(0.5) ],
     "opacity"    => [0..1,          "",   :Number, Sass::Script::Number.new(0.12)],
     "size"       => [1..512,        "px", :Number, Sass::Script::Number.new(200) ],
     "monochrome" => [[true, false], "",   :Bool,   Sass::Script::Bool.new(true) ]
     }) do |name, (range, units, type, default)|

        if val = kwargs.delete(name)
            assert_type val, type, name
            if range && !range.include?(val.value)
                raise ArgumentError.new("$#{name}: Amount #{val} must be between #{range.first}#{units} and #{range.last}#{units}")
            end
        else
            val = default
        end
        opts[name] = val
    end

    image = ChunkyPNG::Image.new(opts["size"].to_i, opts["size"].to_i)

    for i in (0..(opts["intensity"].to_s.to_f * (opts["size"].to_i**2)))
        x = rand(opts["size"].to_i)
        y = rand(opts["size"].to_i)
        r = rand(255)
        a = rand(255 * opts["opacity"].to_s.to_f)
        color = opts["monochrome"] ? ChunkyPNG::Color.rgba(r, r, r, a) : ChunkyPNG::Color.rgba(r, rand(255), rand(255), a)
        image.set_pixel(x, y, color)
    end

    data = Base64.encode64(image.to_blob).gsub("\n", "")
    Sass::Script::String.new("url('data:image/png;base64,#{data}')")
end

#error(message) ⇒ Object

Raises:

  • (Sass::SyntaxError) 


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# File 'lib/compass-recipes/sass_extensions/_error.rb', line 6

def error(message)
    raise Sass::SyntaxError, message.value
end

#gravatar_url(kwargs = {}) ⇒ Object 



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# File 'lib/compass-recipes/sass_extensions/gravatar.rb', line 8

def gravatar_url(kwargs = {})
    opts = {}
    Sass::Util.map_hash({

        'email' => [:String, nil],

        # The URL of a default image to display if the given email address does
        # not have a gravatar.
        'default' => [:String, nil],

        # The default size in pixels for the gravatar image (they're square).
        'size' => [:Number, 48],

        # The maximum allowed MPAA rating for gravatars. This allows you to
        # exclude gravatars that may be out of character for your site.
        'rating' => [:String, 'PG'],

        # Whether or not to display the gravatars using HTTPS instead of HTTP
        'ssl' => [:Bool, Sass::Script::Bool.new(false)],

    }) do |name, (type, default)|

        val = kwargs.delete(name)
        if val
            assert_type val, type, name
        else
            val = default
        end
        opts[name] = val
    end

    email_hash = Digest::MD5::hexdigest(opts['email'].to_s)

    if opts['ssl'].value
        url = "https://secure.gravatar.com/avatar/#{email_hash}.png"
    else
        url = "http://www.gravatar.com/avatar/#{email_hash}.png"
    end

    gravatar_opts = []
    ['rating', 'size', 'default'].each do |opt|
        unless opts[opt].nil?
            value = CGI::escape(opts[opt].to_s)
            gravatar_opts << [opt, value].join('=')
        end
    end

    url << "?#{gravatar_opts.join('&')}" unless gravatar_opts.empty?
    Sass::Script::String.new("url(" + url + ")");
end

#value(number) ⇒ Object 



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# File 'lib/compass-recipes/sass_extensions.rb', line 10

def value(number)
    Sass::Script::Number.new(number.value, ['']);
end