Class: Wunderbar::Node
- Inherits:
-
Object
- Object
- Wunderbar::Node
- Defined in:
- lib/wunderbar/node.rb
Direct Known Subclasses
Constant Summary collapse
- VOID =
%w( area base br col command embed hr img input keygen link meta param source track wbr )
- ESCAPE =
{ "'" => ''', '&' => '&', '"' => '"', '<' => '<', '>' => '>', "\u00A0" => ' ', }
Instance Attribute Summary collapse
-
#attrs ⇒ Object
Returns the value of attribute attrs.
-
#children ⇒ Object
Returns the value of attribute children.
-
#name ⇒ Object
Returns the value of attribute name.
-
#node ⇒ Object
Returns the value of attribute node.
-
#parent ⇒ Object
Returns the value of attribute parent.
-
#text ⇒ Object
Returns the value of attribute text.
Class Method Summary collapse
-
.parse_css_selector(css) ⇒ Object
parse a subset of css_selectors.
Instance Method Summary collapse
- #add_child(child) ⇒ Object
- #at(css) ⇒ Object
-
#initialize(name, *args) ⇒ Node
constructor
A new instance of Node.
- #method_missing(*args) ⇒ Object
- #preserve_spaces? ⇒ Boolean
- #root ⇒ Object
- #search(css) ⇒ Object
- #serialize(options = {}, result = [], indent = '') ⇒ Object
- #walk(result, indent, options) ⇒ Object
Constructor Details
#initialize(name, *args) ⇒ Node
Returns a new instance of Node.
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# File 'lib/wunderbar/node.rb', line 19 def initialize(name, *args) @name = name @text = nil @attrs = {} @children = [] args -= symbols = args.find_all {|arg| Symbol === arg} @attrs = args.pop.to_hash if args.last.respond_to? :to_hash @text = args.shift.to_s unless args.empty? symbols.each {|sym| @attrs[sym] = true} end |
Dynamic Method Handling
This class handles dynamic methods through the method_missing method
#method_missing(*args) ⇒ Object
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# File 'lib/wunderbar/node.rb', line 30 def method_missing(*args) if args.length == 0 attrs[:class] = (attrs[:class].to_s.split(' ') + [name]).join(' ') else name = args.first.to_s err = NameError.new "undefined local variable or method `#{name}'", name err.set_backtrace caller raise err end end |
Instance Attribute Details
#attrs ⇒ Object
Returns the value of attribute attrs.
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# File 'lib/wunderbar/node.rb', line 3 def attrs @attrs end |
#children ⇒ Object
Returns the value of attribute children.
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# File 'lib/wunderbar/node.rb', line 3 def children @children end |
#name ⇒ Object
Returns the value of attribute name.
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# File 'lib/wunderbar/node.rb', line 3 def name @name end |
#node ⇒ Object
Returns the value of attribute node.
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# File 'lib/wunderbar/node.rb', line 3 def node @node end |
#parent ⇒ Object
Returns the value of attribute parent.
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# File 'lib/wunderbar/node.rb', line 3 def parent @parent end |
#text ⇒ Object
Returns the value of attribute text.
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# File 'lib/wunderbar/node.rb', line 3 def text @text end |
Class Method Details
.parse_css_selector(css) ⇒ Object
parse a subset of css_selectors
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# File 'lib/wunderbar/node.rb', line 199 def self.parse_css_selector(css) if css.include? ' ' css.split(/\s+/).map {|token| parse_css_selector(token).first} else result = {} while css != '' if css =~/^([-\w]+)/ result[:name] = $1 css=css[$1.length..-1] elsif css =~/^#([-\w]+)/ raise ArgumentError("duplicate id") if result[:id] result[:id] = $1 css=css[$1.length+1..-1] elsif css =~/^\.([-\w]+)/ result[:class] ||= [] raise ArgumentError("duplicate class") if result[:class].include? $1 result[:class] << $1 css=css[$1.length+1..-1] elsif css =~/^\[([-\w]+)=([-\w]+)\]/ result[:attr] ||= {} raise ArgumentError("duplicate attribute") if result[:attr][$1] result[:attr][$1] = $2 css=css[$1.length+$2.length+3..-1] elsif css =~/^\[([-\w]+)='([^']+)'\]/ result[:attr] ||= {} raise ArgumentError("duplicate attribute") if result[:attr][$1] result[:attr][$1] = $2 css=css[$1.length+$2.length+5..-1] elsif css =~/^\[([-\w]+)="([^"]+)"\]/ result[:attr] ||= {} raise ArgumentError("duplicate attribute") if result[:attr][$1] result[:attr][$1] = $2 css=css[$1.length+$2.length+5..-1] elsif css =~/^\*/ css=css[1..-1] else raise ArgumentError("syntax error: #{css.inspect}") end end [result] end end |
Instance Method Details
#add_child(child) ⇒ Object
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# File 'lib/wunderbar/node.rb', line 41 def add_child(child) @children << child child.parent = self end |
#at(css) ⇒ Object
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# File 'lib/wunderbar/node.rb', line 194 def at(css) search(css).first end |
#preserve_spaces? ⇒ Boolean
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# File 'lib/wunderbar/node.rb', line 146 def preserve_spaces? false end |
#root ⇒ Object
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# File 'lib/wunderbar/node.rb', line 150 def root if parent parent.root else self end end |
#search(css) ⇒ Object
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# File 'lib/wunderbar/node.rb', line 158 def search(css) css = Node.parse_css_selector(css) if String === css matches = [] if children children.each { |child| matches += child.search(css) if Node === child } end pattern = css.first if pattern[:id] return matches unless attrs and attrs[:id] == pattern[:id] end if pattern[:class] names = attrs ? attrs[:class].to_s.split(' ') : [] return matches unless pattern[:class].all? {|name| names.include? name} end if pattern[:name] return matches unless name == pattern[:name] end if pattern[:attr] return matches unless attrs and pattern[:attr].all? do |k1, v1| attrs.any? {|k2, v2| k1.to_s == k2.to_s and v1.to_s == v2.to_s} end end if css.length == 1 matches << self else matches += search(css[1..-1]) end end |
#serialize(options = {}, result = [], indent = '') ⇒ Object
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# File 'lib/wunderbar/node.rb', line 70 def serialize( = {}, result = [], indent = '') line = "#{indent}<#{name}" attrs.each do |name, value| next unless value name = name.to_s.gsub('_','-') if Symbol === name value=name if value==true line += " #{name}=\"#{value.to_s.gsub(/[&\"<>\u00A0]/,ESCAPE)}\"" end if children.empty? if [:pre] line += ">#{[:pre]}#{text}#{[:post]}</#{name}>" else width = [:width] unless preserve_spaces? if text line += ">#{text.to_s.gsub(/[&<>\u00A0]/,ESCAPE)}</#{name}>" elsif VOID.include? name.to_s line += "/>" else line += "></#{name}>" end if indent and width and (line.length > width or line.include? "\n") reflowed = IndentedTextNode.reflow(indent, line, width, [:indent]) line = reflowed.pop result.push *reflowed end end elsif CompactNode === self and not CompactNode === parent work = [] walk(work, nil, ) width = [:width] if width line += ">" work = work.join + "</#{name}>" if line.length + work.length <= width line += work else # split work into tokens with balanced <> tokens = work.split(' ') (tokens.length-1).downto(1) do |i| if tokens[i].count('<') != tokens[i].count('>') tokens[i-1,2] = tokens[i-1] + ' ' + tokens[i] end end line += tokens.shift # add tokens to line, breaking when line length would exceed width tokens.each do |token| if line.length + token.length < width line += ' ' + token else result << line line = indent.to_s + [:indent] + token end end end else line += ">#{work.join}</#{name}>" end else result << line+">#{[:pre]}" if parent walk(result, indent, ) unless children.empty? line = "#{indent}#{[:post]}</#{name}>" end result << line if parent result end |
#walk(result, indent, options) ⇒ Object
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# File 'lib/wunderbar/node.rb', line 46 def walk(result, indent, ) indent += [:indent] if indent and parent first = true spaced = false if preserve_spaces? = .dup [:space] = :preserve end children.each do |child| next unless child result << '' if (spaced or SpacedNode === child) and not first if String === child child = child.gsub(/\s+/, ' ') unless [:space] == :preserve result << child else child.serialize(, result, indent) end first = false spaced = (SpacedNode === child) end end |