Class: Bread::Basket::Poster::CSSReader

Inherits:
Object
  • Object
show all
Includes:
UnitsHelper, CssParser
Defined in:
lib/bread/basket/poster/css_reader.rb

Constant Summary collapse

COLUMNS_FAIL = 
'To use a flow layout your stylesheet must include ' \
'.columns selector.'
LAYOUT_FAIL = 
'Your stylesheet must include the .layout selector.'

Constants included from UnitsHelper

UnitsHelper::DIMENSIONS, UnitsHelper::HASH_SELECTOR_REGEX, UnitsHelper::MEASUREMENT_REGEX, UnitsHelper::NUMERIC_REGEX

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from UnitsHelper

#convert_inner_units, #convert_units

Constructor Details

#initialize(stylesheet_path, layout) ⇒ CSSReader

Returns a new instance of CSSReader.



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# File 'lib/bread/basket/poster/css_reader.rb', line 18

def initialize(stylesheet_path, layout)
  @layout = layout
  @parser = CssParser::Parser.new
  @parser.load_file!(stylesheet_path)
end

Instance Attribute Details

#layout ⇒ Object (readonly)

Returns the value of attribute layout.



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# File 'lib/bread/basket/poster/css_reader.rb', line 12

def layout
  @layout
end

#parser ⇒ Object (readonly)

Returns the value of attribute parser.



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# File 'lib/bread/basket/poster/css_reader.rb', line 12

def parser
  @parser
end

Instance Method Details

#attributes_from_specs(specs) ⇒ Object 



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# File 'lib/bread/basket/poster/css_reader.rb', line 44

def attributes_from_specs(specs)
  layout.width = specs.delete 'width'
  layout.height = specs.delete 'height'
  layout.margin = specs.delete 'margin'
  specs.each do |k, v|
    layout.create_attribute(k, v)
  end
end

#create_bounding_boxes ⇒ Object 



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# File 'lib/bread/basket/poster/css_reader.rb', line 69

def create_bounding_boxes
  parser.each_selector do |selector, declarations|
    next if skip_selector? selector
    method_name = to_method_name selector
    specs = rules_to_specs declarations
    box = create_box selector, layout, specs
    layout.create_attribute(method_name, box)
  end
end

#create_box(selector, layout, specs) ⇒ Object 



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# File 'lib/bread/basket/poster/css_reader.rb', line 85

def create_box(selector, layout, specs)
  if specs.key?('src')
    ImageBox.new selector, layout, specs
  else
    Box.new selector, layout, specs
  end
end

#create_columns ⇒ Object 



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# File 'lib/bread/basket/poster/css_reader.rb', line 60

def create_columns
  columns = parser.find_by_selector '.columns'
  layout.give_up COLUMNS_FAIL if columns.empty?
  specs = rules_to_specs(columns[0])
  columns = Columns.new specs, layout
  layout.create_attribute('columns', columns.boxes)
  layout.create_attribute('column_styles', specs)
end

#create_layout_attributes(specs) ⇒ Object 



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# File 'lib/bread/basket/poster/css_reader.rb', line 39

def create_layout_attributes(specs)
  attributes_from_specs(specs)
  finish_layout_box
end

#create_styles ⇒ Object 



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# File 'lib/bread/basket/poster/css_reader.rb', line 93

def create_styles
  parser.each_selector do |selector, declarations|
    next unless selector =~ HASH_SELECTOR_REGEX
    method_name = to_method_name selector
    specs = rules_to_specs declarations
    layout.create_attribute(method_name, specs)
  end
end

#do_your_thing! ⇒ Object 



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# File 'lib/bread/basket/poster/css_reader.rb', line 24

def do_your_thing!
  init_layout
  create_columns if layout.flow?
  create_bounding_boxes
  create_styles
end

#finish_layout_box ⇒ Object 



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# File 'lib/bread/basket/poster/css_reader.rb', line 53

def finish_layout_box
  layout.left = 0
  layout.right = layout.width
  layout.bottom = 0
  layout.top = layout.height
end

#init_layout ⇒ Object 



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# File 'lib/bread/basket/poster/css_reader.rb', line 31

def init_layout
  layout_rules = parser.find_by_selector '.layout'
  layout.give_up LAYOUT_FAIL if layout_rules.empty?
  specs = rules_to_specs(layout_rules[0])
  create_layout_attributes(specs)
  layout.handle_defaults
end

#rule_to_hash(rule, hash) ⇒ Object 



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# File 'lib/bread/basket/poster/css_reader.rb', line 116

def rule_to_hash(rule, hash)
  rule_arr = rule.split(':')
  key = rule_arr[0].strip
  value_arr = rule_arr[1].strip.split(',')
  value_arr.map!(&:strip)
  hash[key] = value_arr
end

#rules_to_specs(css_rules) ⇒ Object 



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# File 'lib/bread/basket/poster/css_reader.rb', line 102

def rules_to_specs(css_rules)
  # rule => "top: title.bottom, authors.bottom"
  # spec => { top: ['title.bottom', 'authors.bottom'] }
  rules_arr = css_rules.split(';')
  hash = {}

  rules_arr.each { |rule| rule_to_hash(rule, hash) }

  hash.each_with_object({}) do |(k, v), h|
    arr = v.map { |value| convert_units(value) }
    h[k] = arr.length == 1 ? arr[0] : arr
  end
end

#skip_selector?(selector) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/bread/basket/poster/css_reader.rb', line 79

def skip_selector?(selector)
  old_selector = %w(.layout .columns).include? selector
  hash_selector = selector =~ HASH_SELECTOR_REGEX
  old_selector || hash_selector
end

#to_method_name(hash_selector) ⇒ Object 



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# File 'lib/bread/basket/poster/css_reader.rb', line 124

def to_method_name(hash_selector)
  hash_selector.sub('#', '').sub('.', '').gsub('-', '_')
end