Class: Rexle::Element

Inherits:
Object
  • Object
show all
Defined in:
lib/rexle.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name = nil, value = '', attributes = {}) ⇒ Element

Returns a new instance of Element.



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# File 'lib/rexle.rb', line 55

def initialize(name=nil, value='', attributes={})
  @name, @value, @attributes = name, value, attributes
  raise "Element name must not be blank" unless name
  @child_elements = []
  @child_lookup = []
end

Instance Attribute Details

#child_lookup ⇒ Object (readonly)

Returns the value of attribute child_lookup.



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# File 'lib/rexle.rb', line 53

def child_lookup
  @child_lookup
end

#name ⇒ Object

Returns the value of attribute name.



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# File 'lib/rexle.rb', line 52

def name
  @name
end

#parent ⇒ Object

Returns the value of attribute parent.



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# File 'lib/rexle.rb', line 52

def parent
  @parent
end

#value ⇒ Object

Returns the value of attribute value.



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# File 'lib/rexle.rb', line 52

def value
  @value
end

Instance Method Details

#add_attribute(h = {}) ⇒ Object 



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# File 'lib/rexle.rb', line 153

def add_attribute(h={}) @attributes.merge! h end

#add_element(item) ⇒ Object Also known as: add 



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# File 'lib/rexle.rb', line 143

def add_element(item)
  @child_lookup << [item.name, item.attributes, item.value]
  @child_elements << item
  # add a reference from this element (the parent) to the child
  item.parent = self
  item
end

#add_text(s) ⇒ Object 



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# File 'lib/rexle.rb', line 154

def add_text(s) @value = s; self end

#attributes ⇒ Object 



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# File 'lib/rexle.rb', line 155

def attributes() @attributes end

#children ⇒ Object 



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# File 'lib/rexle.rb', line 156

def children() @child_elements end

#children=(a) ⇒ Object 



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# File 'lib/rexle.rb', line 157

def children=(a) @child_elements = a end

#delete(obj = nil) ⇒ Object 



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# File 'lib/rexle.rb', line 159

def delete(obj=nil)
  if obj then
    i = @child_elements.index(obj)
    [@child_elements, @child_lookup].each{|x| x.delete_at i} if i
  else
    self.parent.delete self
  end
end

#element(s) ⇒ Object 



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# File 'lib/rexle.rb', line 168

def element(s) self.xpath(s).first  end

#root ⇒ Object 



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# File 'lib/rexle.rb', line 169

def root() self end

#text(s = '') ⇒ Object 



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# File 'lib/rexle.rb', line 170

def text(s='')
  s.empty? ? @value : self.xpath(s).first.value
end

#xpath(xpath_value, rlist = [], &blk) ⇒ Object 



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# File 'lib/rexle.rb', line 62

def xpath(xpath_value, rlist=[], &blk)

  a_path = xpath_value.split('/')

  if xpath_value[0,2] == '//' then
    s = a_path[2]
  elsif xpath_value == 'text()' then      
    a_path.shift
    return @value
  else
    attribute = xpath_value[/^attribute::(.*)/,1] 
    return @attributes[attribute] if attribute and @attributes and @attributes.has_key?(attribute)
 
    s = a_path.shift
  end
  
  elmnt_path = s[/^([\w\*]+\[[^\]]+\])|[\/]+{,2}[^\/]+/]

  element_part, condition = elmnt_path.match(/(^@?[^\[]+)?(\[[^\]]+\])?/).captures

  if element_part then
    unless element_part[/^@/] then
      element_name = element_part
    else
      condition = element_part
      element_name = nil
    end
  end

  attr_search = format_attributes(condition) if condition

  if xpath_value[0,2] == '//'
    return_elements = scan_match(self, element_name, attr_search, condition, rlist) 
    return (xpath_value[/text\(\)$/] ? return_elements.map(&:value) : return_elements)
  end

  return_elements = @child_lookup.map.with_index.select do |x|
    x[0][0] == element_name or element_name == '*'
  end
    
  if return_elements.length > 0 then

    if a_path.empty? then
      rlist = return_elements.map.with_index {|x,i| filter(x, i+1, attr_search, &blk)}
      rlist = rlist[0] if rlist.length <= 1
    else
      
      rlist << return_elements.map.with_index do |x,i| 
        rtn_element = filter(x, i+1, attr_search){|e| r = e.xpath(a_path.join('/'), &blk); (r || e) }
        next if rtn_element.nil? or (rtn_element.is_a? Array and rtn_element.empty?)

        if rtn_element.is_a? Array then
          rtn_element
        elsif (rtn_element.is_a? String) || (rtn_element.is_a?(Array) and not(rtn_element[0].is_a? String))
          rtn_element
        elsif rtn_element.is_a? Rexle::Element
          rtn_element
        end
      end
      #
      rlist = rlist.flatten(1) unless rlist.length > 1 and rlist[0].is_a? Array

    end
    rlist.compact! if rlist.is_a? Array

  else

    # strip off the 1st element from the XPath
    new_xpath = xpath_value[/^\/\/\w+\/(.*)/,1]

    if new_xpath then
      self.xpath(new_xpath, rlist,&blk)
    end
  end

  #a.shift # added by jr 171110
  rlist = rlist.flatten(1) unless not(rlist.is_a? Array) or (rlist.length > 1 and rlist[0].is_a? Array)
  rlist = [rlist] if rlist.is_a? Rexle::Element
  rlist
end