Module: Doohickey::SassExtensions::Gradients::Functions
- Defined in:
- lib/doohickey/sass_extensions/gradients.rb
Instance Method Summary collapse
- #color_stops(*args) ⇒ Object
-
#first_color_stop(color_list) ⇒ Object
Return the color of the first color stop.
-
#grad_color_stops(color_list) ⇒ Object
returns color-stop() calls for use in webkit.
-
#grad_end_position(color_list, radial = Sass::Script::Bool.new(false)) ⇒ Object
returns the end position of the gradient from the color stop.
-
#grad_opposite_position(position) ⇒ Object
returns the opposite position of a side or corner.
-
#grad_point(position) ⇒ Object
the given a position, return a point in percents.
- #grad_position(color_list, index, default, radial = Sass::Script::Bool.new(false)) ⇒ Object
Instance Method Details
#color_stops(*args) ⇒ Object
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# File 'lib/doohickey/sass_extensions/gradients.rb', line 143 def color_stops(*args) List.new(*args.map do |arg| case arg when Sass::Script::Color ColorStop.new(arg) when Sass::Script::String # We get a string as the result of concatenation # So we have to reparse the expression color = stop = nil expr = Sass::Script::Parser.parse(arg.value, 0, 0) case expr when Sass::Script::Color color = expr when Sass::Script::Funcall color = expr when Sass::Script::Operation unless expr.instance_variable_get("@operator") == :concat # This should never happen. raise Sass::SyntaxError, "Couldn't parse a color stop from: #{arg.value}" end color = expr.instance_variable_get("@operand1") stop = expr.instance_variable_get("@operand2") else raise Sass::SyntaxError, "Couldn't parse a color stop from: #{arg.value}" end ColorStop.new(color, stop) else raise Sass::SyntaxError, "Not a valid color stop: #{arg}" end end) end |
#first_color_stop(color_list) ⇒ Object
Return the color of the first color stop
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# File 'lib/doohickey/sass_extensions/gradients.rb', line 65 def first_color_stop(color_list) color = color_list.values.first.color.inspect Sass::Script::String.new(color) end |
#grad_color_stops(color_list) ⇒ Object
returns color-stop() calls for use in webkit.
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# File 'lib/doohickey/sass_extensions/gradients.rb', line 71 def grad_color_stops(color_list) assert_list(color_list) normalize_stops!(color_list) max = color_list.values.last.stop color_stops = color_list.values.map do |pos| # have to convert absolute units to percentages for use in color stop functions. stop = pos.stop stop = stop.div(max).times(Sass::Script::Number.new(100,["%"])) if stop.numerator_units == max.numerator_units "color-stop(#{stop.inspect}, #{pos.color.inspect})" end Sass::Script::String.new(color_stops.join(", ")) end |
#grad_end_position(color_list, radial = Sass::Script::Bool.new(false)) ⇒ Object
returns the end position of the gradient from the color stop
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# File 'lib/doohickey/sass_extensions/gradients.rb', line 85 def grad_end_position(color_list, radial = Sass::Script::Bool.new(false)) assert_list(color_list) default = Sass::Script::Number.new(100) grad_position(color_list, Sass::Script::Number.new(color_list.values.size), default, radial) end |
#grad_opposite_position(position) ⇒ Object
returns the opposite position of a side or corner.
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# File 'lib/doohickey/sass_extensions/gradients.rb', line 49 def grad_opposite_position(position) opposite = position.value.split(/ +/).map do |pos| case pos when "top" then "bottom" when "bottom" then "top" when "left" then "right" when "right" then "left" when "center" then "center" else raise Sass::SyntaxError, "Cannot determine the opposite of #{pos}" end end Sass::Script::String.new(opposite.join(" ")) end |
#grad_point(position) ⇒ Object
the given a position, return a point in percents
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# File 'lib/doohickey/sass_extensions/gradients.rb', line 117 def grad_point(position) position = position.value position = if position[" "] if position =~ /(top|bottom|center) (left|right|center)/ "#{$2} #{$1}" else position end else case position when /top|bottom/ "left #{position}" when /left|right/ "#{position} top" else position end end Sass::Script::String.new(position. gsub(/top/, "0%"). gsub(/bottom/, "100%"). gsub(/left/,"0%"). gsub(/right/,"100%"). gsub(/center/, "50%")) end |
#grad_position(color_list, index, default, radial = Sass::Script::Bool.new(false)) ⇒ Object
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# File 'lib/doohickey/sass_extensions/gradients.rb', line 91 def grad_position(color_list, index, default, radial = Sass::Script::Bool.new(false)) assert_list(color_list) stop = color_list.values[index.value - 1].stop if stop && radial.to_bool orig_stop = stop if stop.unitless? if stop.value <= 1 # A unitless number is assumed to be a percentage when it's between 0 and 1 stop = stop.times(Sass::Script::Number.new(100, ["%"])) else # Otherwise, a unitless number is assumed to be in pixels stop = stop.times(Sass::Script::Number.new(1, ["px"])) end end if stop.numerator_units == ["%"] && color_list.values.last.stop && color_list.values.last.stop.numerator_units == ["px"] stop = stop.times(color_list.values.last.stop).div(Sass::Script::Number.new(100, ["%"])) end stop.div(Sass::Script::Number.new(1, stop.numerator_units, stop.denominator_units)) elsif stop stop else default end end |