Class: Rexle::Element

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

Defined Under Namespace

Classes: Attribute, Value

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from XMLhelper

#doc_pretty_print, #doc_print, #pretty_print, #processing_instructions, #scan_print, #scan_to_a

Constructor Details

#initialize(name = nil, value: nil, attributes: Attributes.new, rexle: self) ⇒ Element

Returns a new instance of Element.



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# File 'lib/rexle.rb', line 315

def initialize(name=nil, value: nil, attributes: Attributes.new, rexle: self)

  @rexle = rexle      
  super()

  @name, @attributes = name.to_s, attributes

  raise "Element name must not be blank" unless name
  @child_elements = []
  self.add_text value if value

end

Instance Attribute Details

#child_elements ⇒ Object (readonly)

Returns the value of attribute child_elements.



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# File 'lib/rexle.rb', line 311

def child_elements
  @child_elements
end

#doc_id ⇒ Object (readonly)

Returns the value of attribute doc_id.



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# File 'lib/rexle.rb', line 311

def doc_id
  @doc_id
end

#instructions ⇒ Object (readonly)

Returns the value of attribute instructions.



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# File 'lib/rexle.rb', line 311

def instructions
  @instructions
end

#name ⇒ Object

Returns the value of attribute name.



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# File 'lib/rexle.rb', line 310

def name
  @name
end

#parent ⇒ Object

Returns the value of attribute parent.



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# File 'lib/rexle.rb', line 310

def parent
  @parent
end

#value ⇒ Object

Returns the value of attribute value.



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# File 'lib/rexle.rb', line 310

def value
  @value
end

Instance Method Details

#add(item) ⇒ Object 



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# File 'lib/rexle.rb', line 872

def add(item)   

  if item.is_a? Rexle::Element then

    if self.doc_id == item.doc_id then

      new_item = item.deep_clone
      add_element new_item
      item.delete
      item = nil
      item = new_item
      new_item
    else
      add_element item
    end
  else
    add_element item
  end

end

#add_attribute(*x) ⇒ Object 



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# File 'lib/rexle.rb', line 901

def add_attribute(*x)
  
  proc_hash = lambda {|x| Hash[*x]}
  
  procs = {
    Hash: lambda {|x| x[0] || {}},
    String: proc_hash,
    Symbol: proc_hash,
    :'Attributes::Value' => proc_hash
  }

  type = x[0].class.to_s.to_sym

  h = procs[type].call(x)

  @attributes.merge! h
end

#add_element(item) ⇒ Object 



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# File 'lib/rexle.rb', line 850

def add_element(item)

  if item.is_a? String then
    @child_elements << Value.new(item)

  elsif item.is_a? Rexle::CData then
    @child_elements << item
  elsif item.is_a? Rexle::Comment then
    @child_elements << item                
  elsif item.is_a? Rexle::Element then

    @child_elements << item
    # add a reference from this element (the parent) to the child
    item.parent = self
    item        
      
  elsif item.is_a? Rexle then
    self.add_element(item.root)
  end

end

#add_text(s) ⇒ Object 



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# File 'lib/rexle.rb', line 919

def add_text(s)

  self.child_elements << s
  self 
end

#at_css(selector) ⇒ Object 



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# File 'lib/rexle.rb', line 360

def at_css(selector)
  self.root.element RexleCSS.new(selector).to_xpath
end

#attribute(key) ⇒ Object 



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# File 'lib/rexle.rb', line 925

def attribute(key) 
  
  key = key.to_sym if key.is_a? String
  
  if @attributes[key].is_a? String then
    @attributes[key].gsub('&lt;','<').gsub('&gt;','>') 
  else
    @attributes[key]
  end
end

#attributes ⇒ Object 



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# File 'lib/rexle.rb', line 936

def attributes() @attributes end

#backtrack(use_attributes: true) ⇒ Object 



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# File 'lib/rexle.rb', line 328

def backtrack(use_attributes: true)
  BacktrackXPath.new(self, use_attributes: use_attributes)
end

#cdata? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rexle.rb', line 332

def cdata?()
  self.is_a? CData
end

#cdatas ⇒ Object 



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# File 'lib/rexle.rb', line 938

def cdatas()
  self.children.inject([]){|r,x| x.is_a?(Rexle::CData) ? r << x.to_s : r }
end

#children ⇒ Object 



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# File 'lib/rexle.rb', line 942

def children()

  r =  @child_elements
  
  def r.is_an_empty_string?()
    self.length == 1 and self.first == ''
  end      
  
  return r
end

#children=(a) ⇒ Object 



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# File 'lib/rexle.rb', line 953

def children=(a)   @child_elements = a if a.is_a? Array  end

#clone ⇒ Object 



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# File 'lib/rexle.rb', line 957

def clone() 
  Element.new(@name, attributes: Marshal.load( Marshal.dump(@attributes))) 
end

#contains(raw_args) ⇒ Object 



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# File 'lib/rexle.rb', line 336

def contains(raw_args)

  path, raw_val = raw_args.split(',',2)
  val = raw_val.strip[/^["']?.*["']?$/]      
  
  anode = query_xpath(path)

  return [false] if anode.nil? or anode.empty?

  a = scan_contents(anode.first)
  r = [a.grep(/#{val.sub(/^["'](.*)["']$/,'\1')}/).length > 0]

  r.any?
end

#content(options = {}) ⇒ Object 



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# File 'lib/rexle.rb', line 1091

def content(options={})
  CGI.unescapeHTML(xml(options))
end

#count(path) ⇒ Object 



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# File 'lib/rexle.rb', line 351

def count(path)
  length = query_xpath(path).flatten.compact.length
  length
end

#css(selector) ⇒ Object 



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# File 'lib/rexle.rb', line 364

def css(selector)

  selector.split(',')\
              .flat_map{|x| self.root.xpath RexleCSS.new(x).to_xpath}
end

#current ⇒ Object 



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# File 'lib/rexle.rb', line 356

def current()
  self
end

#deep_clone ⇒ Object 



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# File 'lib/rexle.rb', line 955

def deep_clone() Rexle.new(self.xml).root end

#delete(obj = nil) ⇒ Object Also known as: remove 



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# File 'lib/rexle.rb', line 961

def delete(obj=nil)

  if obj then

    if obj.is_a? String then
      
      self.xpath(obj).each {|e| e.delete; e = nil}
      
    else

      i = @child_elements.index(obj)
      [@child_elements].each{|x| x.delete_at i} if i          
    end
  else

    self.parent.delete(self) if self.parent
  end
end

#doc_root ⇒ Object 



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# File 'lib/rexle.rb', line 997

def doc_root() @rexle.root                                  end

#each(&blk) ⇒ Object 



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# File 'lib/rexle.rb', line 998

def each(&blk)    self.children.each(&blk)                  end

#each_recursive(&blk) ⇒ Object Also known as: traverse 



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# File 'lib/rexle.rb', line 999

def each_recursive(&blk) recursive_scan(self.children,&blk) end

#element(s) ⇒ Object 



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# File 'lib/rexle.rb', line 982

def element(s)
  r = self.xpath(s)
  r.is_a?(Array) ? r.first : r
end

#elements(s = nil) ⇒ Object 



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# File 'lib/rexle.rb', line 987

def elements(s=nil)
  procs = {
    NilClass: proc {Elements.new(@child_elements\
                                 .select{|x| x.kind_of? Rexle::Element })},
    String: proc {|x| @child_elements[x]}
  }

  procs[s.class.to_s.to_sym].call(s)      
end

#filter_xpath(raw_path, rlist = [], &blk) ⇒ Object 



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# File 'lib/rexle.rb', line 444

def filter_xpath(raw_path, rlist=[], &blk)
  #@log.debug 'inside filter_xpath : ' + raw_path.inspect
  path = String.new raw_path

  # is it a function
  fn_match = path.match(/^(\w+)\(["']?([^\)]*)["']?\)(?:\[(.*)\])?$/)
  #fn_match = path.match(/^(\w+)\(/)
  #@log.debug 'fn_match : ' + fn_match.inspect
  end_fn_match = path.slice!(/\[\w+\(\)\]$/)
  
  if end_fn_match then
    
    m = end_fn_match[1..-4]
    #@log.debug 'its a function'
    [method(m.to_sym).call(xpath path)]
  
  elsif (fn_match and fn_match.captures.first[/^(attribute|@)/]) 

    procs = {

      Array: proc { |x| 
        if block_given? then 
          x.flatten(1) 
        else
          rs = x.flatten
          rs.any?{|x| x == true or x == false} ? rs : rs.uniq(&:object_id) 
        end
      }, 
     String: proc {|x| x},
      Hash: proc {|x| x},
      TrueClass: proc{|x| x},
      FalseClass: proc{|x| x},
      :"Rexle::Element" => proc {|x| [x]}
    }
    bucket = []
    raw_results = path.split('|').map do |xp|
      query_xpath(xp.strip, bucket, &blk)         
    end
    
    results = raw_results

    procs[results.class.to_s.to_sym].call(results) if results              
    
  elsif fn_match.nil?
    
    procs = {

      Array: proc { |x| 
        if block_given? then 
          x.flatten(1) 
        else
          rs = x.flatten
          rs.any?{|x| x == true or x == false} ? rs : rs.uniq(&:object_id) 
        end
      }, 
     String: proc {|x| x},
      Hash: proc {|x| x},
      TrueClass: proc{|x| x},
      FalseClass: proc{|x| x},
      :"Rexle::Element" => proc {|x| [x]}
    }
    bucket = []
    
    results = if path =~ /[\[]|\(/ then

      raw_results = path.split(/\|/).map do |xp|
        query_xpath(xp.strip, bucket, &blk)         
      end

      raw_results.flatten.index(true) ? [true] : []
      
    else
      raw_results = path.split(/ *(?:\||\band\b) */).map do |xp|
        query_xpath(xp.strip, bucket, &blk)         
      end          

      if path =~ / and / then

        raw_results.flatten.select {|x| x == true or x == false}            

      else
        raw_results.flatten.index(true) ? [true] : []
      end
    end

    return results if !path[/[><]/] and results.any?
    results = raw_results # .flatten.select {|x| x}
    
    procs[results.class.to_s.to_sym].call(results) if results            

  else
    
    m, xpath_value, index = fn_match.captures        

    if m == 'text' then
      a = texts()
      return index ? a[index.to_i - 1].to_s : a
    end
    #@log.debug 'before function call'
    raw_results = xpath_value.empty? ? method(m.to_sym).call \
                                : method(m.to_sym).call(xpath_value)

    raw_results

  end

end

#has_elements? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rexle.rb', line 1001

def has_elements?() !self.elements.empty?                   end

#insert_after(node) ⇒ Object 



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# File 'lib/rexle.rb', line 1002

def insert_after(node)   insert(node, 1)                    end

#insert_before(node) ⇒ Object 



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# File 'lib/rexle.rb', line 1003

def insert_before(node)  insert(node)                       end

#inspect ⇒ Object 



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# File 'lib/rexle.rb', line 893

def inspect()
  if self.xml.length > 30 then
  "%s ... </>" % self.xml[/<[^>]+>/]
  else
    self.xml
  end  
end

#last(a) ⇒ Object 



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# File 'lib/rexle.rb', line 1004

def last(a) a.last                                          end

#lowercase(s) ⇒ Object

not yet implemented



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# File 'lib/rexle.rb', line 371

def lowercase(s)

end

#map(&blk) ⇒ Object 



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# File 'lib/rexle.rb', line 1005

def map(&blk)    self.children.map(&blk)                    end

#max(path) ⇒ Object 



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# File 'lib/rexle.rb', line 375

def max(path) 
  a = query_xpath(path).flatten.select{|x| x.is_a? String or x.is_a? Rexle::Element::Attribute}.map(&:to_i)
  a.max 
end

#next_element ⇒ Object Also known as: next_sibling 



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# File 'lib/rexle.rb', line 396

def next_element()      

  id  = self.object_id
  a = self.parent.elements      

  i = a.index {|x| x.object_id == id} + 2
  a[i] if  i < a.length + 1
    
end

#not(bool) ⇒ Object 



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# File 'lib/rexle.rb', line 408

def not(bool)

  r = self.xpath(bool).any?

  !r
end

#original_clone ⇒ Object 



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# File 'lib/rexle.rb', line 313

alias original_clone clone

#plaintext ⇒ Object 



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# File 'lib/rexle.rb', line 1007

def plaintext()
  CGI.unescapeHTML xml().gsub(/<\/?[^>]+>/,'').gsub('&nbsp;',' ')\
      .gsub(/\n\s+/,' ')
end

#prepend(item) ⇒ Object 



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# File 'lib/rexle.rb', line 1095

def prepend(item)
  
  @child_elements.unshift item
  
  # add a reference from this element (the parent) to the child
  item.parent = self
  item              
end

#previous_element ⇒ Object Also known as: previous_sibling 



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# File 'lib/rexle.rb', line 415

def previous_element()      
  
  id  = self.object_id
  a = self.parent.elements      
  i = a.index {|x| x.object_id == id}

  a[i] if  i > 0 

end

#query_xpath(raw_xpath_value, rlist = [], &blk) ⇒ Object 



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# File 'lib/rexle.rb', line 552

def query_xpath(raw_xpath_value, rlist=[], &blk)

  #@log.debug 'query_xpath : ' + raw_xpath_value.inspect
  #@log.debug '++ ' + self.xml.inspect

  flag_func = false            

  xpath_value = raw_xpath_value.sub('child::','./')

  if xpath_value[/^[\w\/]+\s*=.*/] then

    flag_func = true

    xpath_value.sub!(/^\w+\s*=.*/,'.[\0]')
    xpath_value.sub!(/\/([\w]+\s*=.*)/,'[\1]')

  end

  raw_path, raw_condition = xpath_value.sub(/^\.?\/(?!\/)/,'')\
      .match(/([^\[]+)(\[[^\]]+\])?/).captures

  remaining_path = ($').to_s

  #@log.debug 'remaining_path: ' + remaining_path.inspect

  if remaining_path[/^contains\(/] then

    raw_condition = raw_condition ? raw_condition + '/' + remaining_path \
                                                           : remaining_path
    remaining_path = ''        
  end

  r = raw_path[/^([^\/]+)(?=\/\/)/,1] 

  if r then
    a_path = raw_path.split(/(?=\/\/)/,2)
  else
    a_path = raw_path.split('/',2)
  end
  
  condition = raw_condition if a_path.length <= 1 #and not raw_condition[/^\[\w+\(.*\)\]$/]

  if raw_path[0,2] == '//' then
    s = ''
  elsif raw_path == 'text()'        

    a_path.shift
    #return @value
    return self.texts
  else

    attribute = xpath_value[/^(attribute::|@)(.*)/,2] 
  
    return @attributes  if attribute == '*'
    
    if attribute and @attributes and \
          @attributes.has_key?(attribute.to_sym) then
      return [Attribute.new(@attributes[attribute.to_sym])]
    end
    s = a_path.shift
  end      

  # isolate the xpath to return just the path to the current element

  elmnt_path = s[/^([a-zA-Z:\-\*]+\[[^\]]+\])|[\/]+{,2}[^\/]+/]
  element_part = elmnt_path[/(^@?[^\[]+)?/,1] if elmnt_path

  if element_part then

    unless element_part[/^(@|[@\.a-zA-Z]+[\s=])/] then

      element_name = element_part[/^[\w:\-\*\.]+/]

      if element_name and element_name[/^\d/] then
        element_name = nil
      end
      
      condition = raw_xpath_value if element_name.nil?

    else

      if xpath_value[/^\[/] then
        condition = xpath_value
        element_name = nil
      else
        condition = element_part
        attr_search = format_condition('[' + condition + ']')

        #@log.debug 'attr_search : ' + attr_search.inspect
        return [attribute_search(attr_search, \
                                 self, self.attributes) != nil]
      end

    end

  end

  #element_name ||= '*'
  raw_condition = '' if condition

  attr_search = format_condition(condition) if condition \
                                            and condition.length > 0

  puts ('1. attr_search: ' + attr_search.inspect).debug if $debug
  #@log.debug 'attr_search2 : ' + attr_search.inspect
  attr_search2 = xpath_value[/^\[(.*)\]$/,1]

  if attr_search2 then
    #@log.debug 'before attribute_Search'
    r4 = attribute_search(attr_search, self, self.attributes)
    return r4
  end
  
  
  return_elements = []
  
  

  if raw_path[0,2] == '//' then

    regex = /\[(\d+)\]$/
    n = xpath_value[regex,1]
    xpath_value.slice!(regex)

    rs = scan_match(self, xpath_value).flatten.compact
    return n ? rs[n.to_i-1] : rs

  else

    if element_name.is_a? String then
      ename, raw_selector = (element_name.split('::',2)).reverse
      
      selector = case raw_selector
        when 'following-sibling' then 1
        when 'preceding-sibling' then -1
      end
      
    else
      ename = element_name
    end        

    if ename == '..' then
      
      remaining_xpath = raw_path[/\.\.\/(.*)/,1]
      # select the parent element

      r2 =  self.parent.xpath(remaining_xpath)

      return r2
      
    elsif ename == '.'

      remaining_xpath = raw_path[1..-1]

      if remaining_xpath.empty? then
        if xpath_value.length > 0 and xpath_value =~ /\[/ then

            r = eval(attr_search.sub(/^h/,'self.attributes'))
            return self if r 

        else
          return self
        end
      else
        return self.xpath(remaining_xpath)
      end          

    elsif element_name.nil?
      puts ('attr_search: ' + attr_search.inspect).debug if $debug
      return eval attr_search          
    else

      if raw_selector.nil? and ename != element_part  then

        right_cond = element_part[/#{ename}(.*)/,1]

      end                    

      return_elements = @child_elements.map.with_index.select do |x, i|

        next unless x.is_a? Rexle::Element

        #x.name == ename or  (ename == '*')
        
        r10 = ((x.name == ename) or  (ename == '*'))

        

      end
      
      if right_cond then
                    
        
        r12 = return_elements.map do |x, i|

          if x.text then

            r11 = eval "'%s'%s" % [x.text.to_s, right_cond]

          else
            false
          end
          
        end
        
        return r12
        
      end          
      
      if selector then
        ne = return_elements.inject([]) do |r,x| 
          i = x.last + selector
          if i >= 0 then
            r << i
          else
            r
          end
        end

        return_elements = ne.map {|x| [@child_elements[x], x] if x}
      end
                

    end
  end
            
  if return_elements.length > 0 then

    if (a_path + [remaining_path]).join.empty? then

      # pass in a block to the filter if it is function contains?
      rlist = return_elements.map.with_index do |x,i| 
        r5 = filter(x, i+1, attr_search, &blk)

        r5
      end.compact

      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) do |e| 

          r = e.xpath(a_path.join('/') + raw_condition.to_s \
                + remaining_path, &blk)

          r = e if r.is_a?(Array) and r.first and r.first == true \
                                                          and a_path.empty?

          r
        end

        next if rtn_element.nil? or (rtn_element.is_a? Array \
                                                  and rtn_element.empty?)

        if rtn_element.is_a? Hash then
          rtn_element
        elsif 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
        elsif rtn_element  == true
          true
        end
      end

      rlist = rlist.flatten(1) unless rlist.length > 1 \
                                                   and rlist[0].is_a? Array
      rlist

    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 + raw_condition.to_s + remaining_path, \
                                                            rlist,&blk)
    end
  end
 
  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 = (rlist.length > 0 ? true : false) if flag_func == true

  rlist
end

#root ⇒ Object 



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# File 'lib/rexle.rb', line 1012

def root() self                                             end

#text(s = '') ⇒ Object 



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# File 'lib/rexle.rb', line 1014

def text(s='')
  
  return self.value if s.empty? 
  
  e = self.element(s)
  return e if e.is_a? String
  
  e.value if e
end

#texts ⇒ Object 



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# File 'lib/rexle.rb', line 1024

def texts()

 r = @child_elements.select do |x|
    x.is_a? String or x.is_a? Rexle::CData
  end
  
  r.map do |x|
    def x.unescape()
      s = self.to_s.clone
      %w(&lt; < &gt; > &amp; & &apos; ').each_slice(2){|x| s.gsub!(*x)}
      s
    end            
  end
  
  return r
end

#to_a ⇒ Object 



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# File 'lib/rexle.rb', line 1069

def to_a()
  e = [String.new(self.name), Hash.new(self.attributes)]
  [*e, *scan_to_a(self.children)]
end

#xml(options = {}) ⇒ Object Also known as: to_s 



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# File 'lib/rexle.rb', line 1074

def xml(options={})

  h = {
    Hash: lambda {|x|
      o = {pretty: false}.merge(x)
      msg = o[:pretty] == false ? :doc_print : :doc_pretty_print
     
      method(msg).call(self.children)
    },
    String: lambda {|x| 
      r = self.element(x)
      r ? r.xml : ''
    }
  }
  h[options.class.to_s.to_sym].call options
end

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



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# File 'lib/rexle.rb', line 427

def xpath(path, rlist=[], &blk)
  
  #@log.debug 'inside xpath ' + path.inspect

  r = filter_xpath(path, rlist=[], &blk)
  #@log.debug 'after filter_xpath : ' + r.inspect
  
  if r.is_a?(Array) then
    
    Recordset.new(r.compact)
    
  else
    r
  end
  
end