simple_selector

# File actionpack/lib/action_controller/vendor/html-scanner/html/selector.rb, line 522 def simple_selector(statement, values, can_negate = true) tag_name = nil attributes = [] pseudo = [] negation = [] # Element name. (Note that in negation, this can come at # any order, but for simplicity we allow if only first). statement.sub!(/^(\*|[[:alpha:]][\w\-]*)/) do |match| match.strip! tag_name = match.downcase unless match == "*" @source << match "" # Remove end # Get identifier, class, attribute name, pseudo or negation. while true # Element identifier. next if statement.sub!(/^#(\?|[\w\-]+)/) do |match| id = $1 if id == "?" id = values.shift end @source << "##{id}" id = Regexp.new("^#{Regexp.escape(id.to_s)}$") unless id.is_a?(Regexp) attributes << ["id", id] "" # Remove end # Class name. next if statement.sub!(/^\.([\w\-]+)/) do |match| class_name = $1 @source << ".#{class_name}" class_name = Regexp.new("(^|\s)#{Regexp.escape(class_name)}($|\s)") unless class_name.is_a?(Regexp) attributes << ["class", class_name] "" # Remove end # Attribute value. next if statement.sub!(/^\[\s*([[:alpha:]][\w\-:]*)\s*((?:[~|^$*])?=)?\s*('[^']*'|"[^*]"|[^\]]*)\s*\]/) do |match| name, equality, value = $1, $2, $3 if value == "?" value = values.shift else # Handle single and double quotes. value.strip! if (value[0] == "" || value[0] == '') && value[0] == value[-1] value = value[1..-2] end end @source << "[#{name}#{equality}'#{value}']" attributes << [name.downcase.strip, attribute_match(equality, value)] "" # Remove end # Root element only. next if statement.sub!(/^:root/) do |match| pseudo << lambda do |element| element.parent.nil? || !element.parent.tag? end @source << ":root" "" # Remove end # Nth-child including last and of-type. next if statement.sub!(/^:nth-(last-)?(child|of-type)\((odd|even|(\d+|\?)|(-?\d*|\?)?n([+\-]\d+|\?)?)\)/) do |match| reverse = $1 == "last-" of_type = $2 == "of-type" @source << ":nth-#{$1}#{$2}(" case $3 when "odd" pseudo << nth_child(2, 1, of_type, reverse) @source << "odd)" when "even" pseudo << nth_child(2, 2, of_type, reverse) @source << "even)" when /^(\d+|\?)$/ # b only b = ($1 == "?" ? values.shift : $1).to_i pseudo << nth_child(0, b, of_type, reverse) @source << "#{b})" when /^(-?\d*|\?)?n([+\-]\d+|\?)?$/ a = ($1 == "?" ? values.shift : $1 == "" ? 1 : $1 == "-" ? -1 : $1).to_i b = ($2 == "?" ? values.shift : $2).to_i pseudo << nth_child(a, b, of_type, reverse) @source << (b >= 0 ? "#{a}n+#{b})" : "#{a}n#{b})") else raise ArgumentError, "Invalid nth-child #{match}" end "" # Remove end # First/last child (of type). next if statement.sub!(/^:(first|last)-(child|of-type)/) do |match| reverse = $1 == "last" of_type = $2 == "of-type" pseudo << nth_child(0, 1, of_type, reverse) @source << ":#{$1}-#{$2}" "" # Remove end # Only child (of type). next if statement.sub!(/^:only-(child|of-type)/) do |match| of_type = $1 == "of-type" pseudo << only_child(of_type) @source << ":only-#{$1}" "" # Remove end # Empty: no child elements or meaningful content (whitespaces # are ignored). next if statement.sub!(/^:empty/) do |match| pseudo << lambda do |element| empty = true for child in element.children if child.tag? || !child.content.strip.empty? empty = false break end end empty end @source << ":empty" "" # Remove end # Content: match the text content of the element, stripping # leading and trailing spaces. next if statement.sub!(/^:content\(\s*(\?|'[^']*'|"[^"]*"|[^)]*)\s*\)/) do |match| content = $1 if content == "?" content = values.shift elsif (content[0] == "" || content[0] == '') && content[0] == content[-1] content = content[1..-2] end @source << ":content('#{content}')" content = Regexp.new("^#{Regexp.escape(content.to_s)}$") unless content.is_a?(Regexp) pseudo << lambda do |element| text = "" for child in element.children unless child.tag? text << child.content end end text.strip =~ content end "" # Remove end # Negation. Create another simple selector to handle it. if statement.sub!(/^:not\(\s*/, "") raise ArgumentError, "Double negatives are not missing feature" unless can_negate @source << ":not(" negation << simple_selector(statement, values, false) raise ArgumentError, "Negation not closed" unless statement.sub!(/^\s*\)/, "") @source << ")" next end # No match: moving on. break end # Return hash. The keys are mapped to instance variables. {:tag_name=>tag_name, :attributes=>attributes, :pseudo=>pseudo, :negation=>negation} end