Module: Caps::Parser::Consumers

Included in:
Caps::Parser
Defined in:
lib/caps/parser/consumers.rb

Instance Method Summary collapse

Instance Method Details

#consume_at_rule ⇒ Object 



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# File 'lib/caps/parser/consumers.rb', line 35

def consume_at_rule
  obj = {
    type: :at_rule,
    name: advance,
    prelude: [],
    value: nil
  }

  loop do
    p = peek
    case
    when p.semicolon? || p.eof?
      advance
      return obj

    when p.left_curly?
      obj[:block] = consume_simple_block
      return obj

    else
      obj[:prelude] << consume_component_value
    end
  end
end

#consume_component_value ⇒ Object 



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# File 'lib/caps/parser/consumers.rb', line 200

def consume_component_value
  if peek.left_curly? || peek.left_square? || peek.left_parens?
    consume_simple_block
  elsif peek.function?
    consume_function
  else
    advance
  end
end

#consume_declaration ⇒ Object 



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# File 'lib/caps/parser/consumers.rb', line 169

def consume_declaration
  obj = {
    type: :declaration,
    name: advance,
    value: [],
    important: false
  }

  consume_whitespace

  unless peek.colon?
    resync_invalid_declaration
    return nil
  end

  advance # consume colon

  consume_whitespace

  obj[:value] << consume_component_value until peek.eof? || peek.semicolon?

  if contains_important_annotation?(obj[:value])
    obj[:important] = true
    obj[:value] = remove_important_annotation(obj[:value])
  end

  obj[:value].pop while obj[:value].last.whitespace?

  obj
end

#consume_declaration_list ⇒ Object 



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# File 'lib/caps/parser/consumers.rb', line 118

def consume_declaration_list
  decls = []

  loop do
    p = peek

    case
    when p.whitespace? || p.semicolon?
      advance

    when p.eof?
      return decls

    when p.at_keyword?
      decls << consume_at_rule

    when p.ident?
      tmp = [advance]
      tmp << consume_component_value while !peek.semicolon? && !peek.eof?
      tmp_parser = Parser.new(tmp)
      tmp = tmp_parser.consume_declaration
      decls << tmp unless tmp.nil?

    else
      # Parse error. Throw away until semicolon or eof
      consume_component_value while !peek.semicolon? || semi.eof?
    end
  end
end

#consume_function ⇒ Object 



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# File 'lib/caps/parser/consumers.rb', line 249

def consume_function
  obj = {
    type: :function,
    name: advance,
    value: []
  }

  loop do
    p = peek
    if p.eof?
      # Parse error
      break
    elsif p.right_parens?
      advance
      break
    else
      obj[:value] << consume_component_value
    end
  end

  obj
end

#consume_list_of_rules(top_level: false) ⇒ Object 



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# File 'lib/caps/parser/consumers.rb', line 8

def consume_list_of_rules(top_level: false)
  list = []

  until peek.eof?
    p = peek
    if p.whitespace?
      advance

    elsif (p.cdo? || p.cdc?) && top_level
      advance

    elsif p.cdo? || p.cdc?
      tmp = consume_qualified_rule
      list << tmp unless tmp.nil?

    elsif p.at_keyword?
      list << consume_at_rule

    else
      tmp = consume_qualified_rule
      list << tmp unless tmp.nil?
    end
  end

  list
end

#consume_qualified_rule ⇒ Object 



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# File 'lib/caps/parser/consumers.rb', line 60

def consume_qualified_rule
  obj = {
    type: :qualified_rule,
    prelude: [],
    value: nil
  }

  loop do
    p = peek
    case
    when p.eof?
      return nil

    when p.left_curly?
      obj[:block] = consume_simple_block
      return obj

    else
      obj[:prelude] << consume_component_value
    end
  end
end

#consume_simple_block ⇒ Object 



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# File 'lib/caps/parser/consumers.rb', line 224

def consume_simple_block
  block = {
    type: :simple_block,
    associated_token: advance,
    value: []
  }

  mirror_variant = mirror_variant_for(block[:associated_token])

  loop do
    p = peek
    if p.type == mirror_variant
      advance
      break
    elsif p.eof?
      # parse error
      break
    else
      block[:value] << consume_component_value
    end
  end

  block
end

#consume_style_block_contents ⇒ Object 



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# File 'lib/caps/parser/consumers.rb', line 83

def consume_style_block_contents
  decls = []
  rules = []

  loop do
    p = peek

    case
    when p.whitespace? || p.semicolon?
      advance

    when p.eof?
      return decls + rules

    when p.at_keyword?
      rules << consume_at_rule

    when p.ident?
      tmp = [advance]
      tmp << consume_component_value while !peek.semicolon? && !peek.eof?
      tmp_parser = Parser.new(tmp)
      tmp = tmp_parser.consume_declaration
      decls << tmp unless tmp.nil?

    when p.delim? && p.value == "&"
      tmp = consume_qualified_rule
      rules << tmp unless tmp.nil?

    else
      # Parse error. Throw away until semicolon or eof
      consume_component_value while !peek.semicolon? && !peek.eof?
    end
  end
end

#contains_important_annotation?(list) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/caps/parser/consumers.rb', line 152

def contains_important_annotation?(list)
  last_two = list.reject(&:whitespace?).slice(-2, 2)
  return false unless last_two

  last_two.map(&:type) == %i[delim ident] &&
    last_two.first.value == "!" &&
    last_two.last.value.casecmp?("important")
end

#mirror_variant_for(obj) ⇒ Object 



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# File 'lib/caps/parser/consumers.rb', line 210

def mirror_variant_for(obj)
  case obj.type
  when :left_curly
    :right_curly
  when :left_parens
    :right_parens
  when :left_square
    :right_square
  else
    byebug
    raise "BUG: No mirror variant for #{obj.type}!"
  end
end

#remove_important_annotation(list) ⇒ Object 



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# File 'lib/caps/parser/consumers.rb', line 161

def remove_important_annotation(list)
  idx = list.reverse.index do |i|
    i.type == :ident && i.value.casecmp?("important")
  end

  list.slice(0, list.length - idx - 2)
end

#resync_invalid_declaration ⇒ Object 



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# File 'lib/caps/parser/consumers.rb', line 148

def resync_invalid_declaration
  advance until peek.eof? || peek.semicolon?
end