Class: Bliss::ParserMachine

Inherits:
Nokogiri::XML::SAX::Document
  • Object
show all
Defined in:
lib/bliss/parser_machine.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ ParserMachine

Returns a new instance of ParserMachine.



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# File 'lib/bliss/parser_machine.rb', line 3

def initialize
  @depth = []
  # @settings = {} # downcased

  @root = nil
  @nodes = {}
  @current_node = {}

  @on_root = nil

  @on_tag_open = {}
  @on_tag_close = {}

  @constraints = []

  @closed = false

end

Instance Method Details

#cdata_block(string) ⇒ Object 



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# File 'lib/bliss/parser_machine.rb', line 122

def cdata_block(string)
  return if is_closed?
  concat_content(string)
end

#characters(string) ⇒ Object

def open_tag_regexps

  return @open_tag_regexps if @open_tag_regexps

  @open_tag_regexps = @on_tag_open.keys.collect {|key| Regexp.new(key) }
  @open_tag_regexps
end

def close_tag_regexps
  return @close_tag_regexps if @close_tag_regexps

  @close_tag_regexps = @on_tag_close.keys.collect {|key| Regexp.new(key) }
  @close_tag_regexps
end



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# File 'lib/bliss/parser_machine.rb', line 117

def characters(string)
  return if is_closed?
  concat_content(string)
end

#close ⇒ Object 



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# File 'lib/bliss/parser_machine.rb', line 40

def close
  @closed = true
end

#concat_content(string) ⇒ Object 



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# File 'lib/bliss/parser_machine.rb', line 179

def concat_content(string)
  string.strip!
  if string
    @current_content << string
  end
end

#constraints(constraints) ⇒ Object 



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# File 'lib/bliss/parser_machine.rb', line 22

def constraints(constraints)
  @constraints = constraints
end

#end_document ⇒ Object 



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# File 'lib/bliss/parser_machine.rb', line 186

def end_document
  #puts @nodes.inspect
end

#end_element(element, attributes = []) ⇒ Object 



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# File 'lib/bliss/parser_machine.rb', line 127

def end_element(element, attributes=[])
  return if is_closed?
  # element_transformation

  current = @nodes.pair_at_chain(@depth)
  value_at = @nodes.value_at_chain(@depth)

  if value_at.is_a? Hash
    current[element] = @current_content if @current_content.size > 0
  elsif value_at.is_a? NilClass
    if current.is_a? Array
      current = current.last
      current[element] = @current_content if @current_content.size > 0
    end
  end
  @current_content = ''

  # TODO search on hash with xpath style
  # for example:
  # keys: */ad/url
  # keys: root/ad/url
  # @on_tag_close.keys.select {|key| @depth.match(key)}
  ##

  search_key = @depth.join('/') # element
  
  if @depth.last == 'ad'
    #puts search_key
    #puts value_at.keys.inspect
    #ad array #puts @constraints.select{|c| search_key.match(Regexp.new("#{c.depth.split('/').join('/')}$"))}.inspect
    #puts current.keys.inspect
    # others puts @constraints.select{|c| search_key.match(Regexp.new("#{c.depth.split('/')[0..-2].join('/')}$"))}.inspect
  end

  @on_tag_close.keys.select{ |r| search_key.match(r) }.each do |reg|
    @on_tag_close[reg].call(value_at, @depth)
  end
  # TODO constraint should return Regexp like depth too

  #puts @constraints.collect(&:state).inspect

  @constraints.select{|c| [:not_checked, :passed].include?(c.state) }.select {|c| search_key.match(Regexp.new("#{c.depth.split('/').join('/')}$")) }.each do |constraint|
    #puts "search_key: #{search_key}"
    #puts "value_at.inspect: #{value_at.inspect}"
    #puts "current.inspect: #{current.inspect}"

    constraint.run!(current)
  end

  @depth.pop if @depth.last == element
end

#is_closed? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/bliss/parser_machine.rb', line 44

def is_closed?
  @closed
end

#on_root(&block) ⇒ Object 



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# File 'lib/bliss/parser_machine.rb', line 26

def on_root(&block)
  @on_root = block
end

#on_tag_close(element, block) ⇒ Object 



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# File 'lib/bliss/parser_machine.rb', line 34

def on_tag_close(element, block)
  # TODO
  # check how do we want to handle on_tag_close depths (xpath, array, another)
  @on_tag_close.merge!({Regexp.new("#{element}$") => block})
end

#on_tag_open(element, block) ⇒ Object 



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# File 'lib/bliss/parser_machine.rb', line 30

def on_tag_open(element, block)
  @on_tag_open.merge!({Regexp.new("#{element}$") => block})
end

#start_element(element, attributes) ⇒ Object 



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# File 'lib/bliss/parser_machine.rb', line 48

def start_element(element, attributes)
  return if is_closed?
  # element_transformation

  if @root == nil
    @root = element
    if @on_root.is_a? Proc
      @on_root.call(@root)
    end
  end

  @depth.push(element) if @depth.last != element
  
  # TODO search on hash with xpath style
  # for example:
  # keys: */ad/url
  # keys: root/ad/url
  # @on_tag_close.keys.select {|key| @depth.match(key)}

  # other example:
  # keys: root/(ad|AD)/description
  ##

  search_key = @depth.join('/') # element
  @on_tag_open.keys.select{ |r| search_key.match(r) }.each do |reg|
    @on_tag_open[reg].call(@depth)
  end

  current = @nodes.pair_at_chain(@depth)

  value_at = @nodes.value_at_chain(@depth)
  
  if current.is_a? Hash
    if value_at.is_a? NilClass
      current[element] = {}
    elsif value_at.is_a? Hash
      if current[element].is_a? Array
        current[element].concat [{}]
      else
        current[element] = [current[element], {}]
        #current = @nodes.pair_at_chain(@depth)
      end
    elsif value_at.is_a? Array
      #puts @depth.inspect
      #puts current[element].inspect
      #puts current[element].inspect
    end
  elsif current.is_a? Array
  end

  @current_content = ''
end