Module: SilkLayout::CSS::Properties

Defined in:
lib/silk_layout/css/properties.rb

Constant Summary collapse

EDGES = 
%w[
  top
  right
  bottom
  left
].freeze
BORDER_PARTS = 
%w[
  width
  style
  color
].freeze
CSS_WIDE_KEYWORDS = 
%w[
  inherit
  initial
  unset
].freeze
INHERITED = 
%w[
  color
  font-size
  font-family
  font-weight
  font-style
  line-height
].freeze
SPACING_INITIALS = 
%w[
  margin
  padding
].flat_map do |property|
  EDGES.map { |side| ["#{property}-#{side}", "0"] }
end.to_h.freeze
BORDER_INITIALS = 
EDGES.flat_map do |side|
  [
    ["border-#{side}-width", "medium"],
    ["border-#{side}-style", "none"],
    ["border-#{side}-color", "black"]
  ]
end.to_h.freeze
INITIAL_VALUES = 
{
  "color" => "black",
  "font-size" => "16px",
  "font-family" => "Helvetica",
  "font-weight" => "normal",
  "font-style" => "normal",
  "line-height" => "normal",
  "display" => "inline",
  "width" => "auto",
  "height" => "auto",
  "box-sizing" => "content-box",
  "min-width" => "0",
  "max-width" => "none",
  "background-color" => "transparent",
  "flex-direction" => "row",
  "flex-wrap" => "nowrap",
  "justify-content" => "flex-start",
  "align-items" => "stretch",
  "flex-grow" => "0",
  "flex-shrink" => "1",
  "flex-basis" => "auto",
  "row-gap" => "0",
  "column-gap" => "0"
}.merge(SPACING_INITIALS).merge(BORDER_INITIALS).freeze
DEFAULTS = 
INITIAL_VALUES
KNOWN = 
INITIAL_VALUES.keys.freeze

Class Method Summary collapse

Class Method Details

.all_border_longhands(value = nil) ⇒ Object 



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# File 'lib/silk_layout/css/properties.rb', line 180

def self.all_border_longhands(value = nil)
  EDGES.flat_map do |side|
    BORDER_PARTS.map do |part|
      ["border-#{side}-#{part}", block_given? ? yield(side, part) : value]
    end
  end
end

.background_color(value) ⇒ Object 



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# File 'lib/silk_layout/css/properties.rb', line 210

def self.background_color(value)
  split_tokens(value).find { |token| color_token?(token) } || INITIAL_VALUES.fetch("background-color")
end

.border_edge_longhands(part, value) ⇒ Object 



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# File 'lib/silk_layout/css/properties.rb', line 188

def self.border_edge_longhands(part, value)
  EDGES.map { |side| ["border-#{side}-#{part}", value] }
end

.border_shorthand(value) ⇒ Object 



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# File 'lib/silk_layout/css/properties.rb', line 198

def self.border_shorthand(value)
  split_tokens(value).each_with_object({}) do |token, parsed|
    if border_width?(token)
      parsed["width"] ||= token
    elsif border_style?(token)
      parsed["style"] ||= token
    else
      parsed["color"] ||= token
    end
  end
end

.border_side_longhands(side, value = nil) ⇒ Object 



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# File 'lib/silk_layout/css/properties.rb', line 192

def self.border_side_longhands(side, value = nil)
  BORDER_PARTS.map do |part|
    ["border-#{side}-#{part}", block_given? ? yield(part) : value]
  end
end

.border_style?(value) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/silk_layout/css/properties.rb', line 291

def self.border_style?(value)
  %w[
    none
    hidden
    dotted
    dashed
    solid
    double
    groove
    ridge
    inset
    outset
  ].include?(value.to_s)
end

.border_width?(value) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/silk_layout/css/properties.rb', line 287

def self.border_width?(value)
  value.to_s.match?(/\A[-+]?\d*\.?\d+(?:px)?\z/) || %w[thin medium thick].include?(value.to_s)
end

.color_token?(value) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/silk_layout/css/properties.rb', line 306

def self.color_token?(value)
  raw = value.to_s.strip
  return false if raw.empty?
  return true if raw.start_with?("#")
  return true if SilkLayout::CSS::Color.parse(raw)
  return false if %w[none transparent inherit initial unset].include?(raw)

  !border_width?(raw) && !border_style?(raw) && !raw.include?("(") && !raw.include?("/")
end

.css_wide_expansion(property, value) ⇒ Object 



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# File 'lib/silk_layout/css/properties.rb', line 107

def self.css_wide_expansion(property, value)
  case property
  when "margin", "padding"
    EDGES.map { |side| ["#{property}-#{side}", value] }
  when "border"
    all_border_longhands(value)
  when "border-width", "border-style", "border-color"
    border_edge_longhands(property.delete_prefix("border-"), value)
  when /\Aborder-(top|right|bottom|left)\z/
    border_side_longhands(Regexp.last_match(1), value)
  when "background"
    [["background-color", value]]
  when "flex"
    flex_longhands(value, value, value)
  when "flex-flow"
    flex_flow_longhands(value, value)
  when "gap"
    gap_longhands(value, value)
  else
    []
  end
end

.css_wide_keyword?(value) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/silk_layout/css/properties.rb', line 91

def self.css_wide_keyword?(value)
  CSS_WIDE_KEYWORDS.include?(value.to_s.strip.downcase)
end

.edge_values(value) ⇒ Object 



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# File 'lib/silk_layout/css/properties.rb', line 161

def self.edge_values(value)
  tokens = split_tokens(value)
  values =
    case tokens.length
    when 0
      []
    when 1
      [tokens[0], tokens[0], tokens[0], tokens[0]]
    when 2
      [tokens[0], tokens[1], tokens[0], tokens[1]]
    when 3
      [tokens[0], tokens[1], tokens[2], tokens[1]]
    else
      [tokens[0], tokens[1], tokens[2], tokens[3]]
    end

  EDGES.zip(values).to_h
end

.expand_declaration(property, value) ⇒ Object 



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# File 'lib/silk_layout/css/properties.rb', line 77

def self.expand_declaration(property, value)
  property = property.to_s.downcase
  value = value.to_s.strip
  expanded = [[property, value]]

  expanded.concat(
    if css_wide_keyword?(value)
      css_wide_expansion(property, value)
    else
      shorthand_expansion(property, value)
    end
  )
end

.flex_flow(value) ⇒ Object 



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# File 'lib/silk_layout/css/properties.rb', line 242

def self.flex_flow(value)
  parsed = split_tokens(value).each_with_object({}) do |token, acc|
    if %w[row row-reverse column column-reverse].include?(token)
      acc["direction"] = token
    elsif %w[nowrap wrap wrap-reverse].include?(token)
      acc["wrap"] = token
    end
  end

  {
    "direction" => parsed["direction"] || INITIAL_VALUES.fetch("flex-direction"),
    "wrap" => parsed["wrap"] || INITIAL_VALUES.fetch("flex-wrap")
  }
end

.flex_flow_longhands(direction, wrap) ⇒ Object 



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# File 'lib/silk_layout/css/properties.rb', line 257

def self.flex_flow_longhands(direction, wrap)
  [
    ["flex-direction", direction],
    ["flex-wrap", wrap]
  ]
end

.flex_longhands(grow, shrink, basis) ⇒ Object 



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# File 'lib/silk_layout/css/properties.rb', line 234

def self.flex_longhands(grow, shrink, basis)
  [
    ["flex-grow", grow],
    ["flex-shrink", shrink],
    ["flex-basis", basis]
  ]
end

.flex_shorthand(value) ⇒ Object 



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# File 'lib/silk_layout/css/properties.rb', line 214

def self.flex_shorthand(value)
  tokens = split_tokens(value)

  case tokens.join(" ")
  when "none"
    {"grow" => "0", "shrink" => "0", "basis" => "auto"}
  when "auto"
    {"grow" => "1", "shrink" => "1", "basis" => "auto"}
  else
    numbers = tokens.select { |token| numeric?(token) }
    basis = tokens.find { |token| !numeric?(token) }

    {
      "grow" => numbers[0] || "1",
      "shrink" => numbers[1] || "1",
      "basis" => basis || (numbers.any? ? "0px" : "auto")
    }
  end
end

.gap_longhands(row, column) ⇒ Object 



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# File 'lib/silk_layout/css/properties.rb', line 272

def self.gap_longhands(row, column)
  [
    ["row-gap", row],
    ["column-gap", column]
  ]
end

.gap_values(value) ⇒ Object 



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# File 'lib/silk_layout/css/properties.rb', line 264

def self.gap_values(value)
  values = split_tokens(value)
  row = values[0] || INITIAL_VALUES.fetch("row-gap")
  column = values[1] || row

  gap_longhands(row, column)
end

.inherited?(property) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/silk_layout/css/properties.rb', line 103

def self.inherited?(property)
  INHERITED.include?(property)
end

.initial_value(property) ⇒ Object 



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# File 'lib/silk_layout/css/properties.rb', line 95

def self.initial_value(property)
  INITIAL_VALUES[property]
end

.known?(property) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/silk_layout/css/properties.rb', line 99

def self.known?(property)
  KNOWN.include?(property)
end

.numeric?(value) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/silk_layout/css/properties.rb', line 283

def self.numeric?(value)
  value.to_s.match?(/\A[-+]?\d*\.?\d+\z/)
end

.shorthand_expansion(property, value) ⇒ Object 



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# File 'lib/silk_layout/css/properties.rb', line 130

def self.shorthand_expansion(property, value)
  case property
  when "margin", "padding"
    edge_values(value).map { |side, side_value| ["#{property}-#{side}", side_value] }
  when "border"
    parsed = border_shorthand(value)
    all_border_longhands do |side, part|
      parsed[part] || INITIAL_VALUES.fetch("border-#{side}-#{part}")
    end
  when "border-width", "border-style", "border-color"
    part = property.delete_prefix("border-")
    edge_values(value).map { |side, side_value| ["border-#{side}-#{part}", side_value] }
  when /\Aborder-(top|right|bottom|left)\z/
    side = Regexp.last_match(1)
    parsed = border_shorthand(value)
    border_side_longhands(side) do |part|
      parsed[part] || INITIAL_VALUES.fetch("border-#{side}-#{part}")
    end
  when "background"
    [["background-color", background_color(value)]]
  when "flex"
    flex_shorthand(value).map { |part, part_value| ["flex-#{part}", part_value] }
  when "flex-flow"
    flex_flow(value).map { |part, part_value| ["flex-#{part}", part_value] }
  when "gap"
    gap_values(value)
  else
    []
  end
end

.split_tokens(value) ⇒ Object 



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# File 'lib/silk_layout/css/properties.rb', line 279

def self.split_tokens(value)
  Values.split_tokens(value)
end