Class: RexleXPath

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

Instance Method Summary collapse

Constructor Details

#initialize(node = nil, debug: false) ⇒ RexleXPath

Returns a new instance of RexleXPath.



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# File 'lib/rexle-xpath.rb', line 23

def initialize(node=nil, debug: false)

  @node = node
  @debug = debug
  
end

Instance Method Details

#parse(s) ⇒ Object 



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# File 'lib/rexle-xpath.rb', line 30

def parse(s)

  # it's an xpath function only
  if /^(?<name>\w+)\(\)$/ =~ s
    
    @node.method((name).to_sym).call
    
  # it's an element only
  elsif /^(?<name>\w+)$/ =~ s
    
    select(@node, [name])
    
  else

    xpath_instructions = RexleXPathParser.new(s).to_a
    
    query xpath_instructions, @node
  end
end

#query(xpath_instructions = [], node = @node) ⇒ Object 



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# File 'lib/rexle-xpath.rb', line 51

def query(xpath_instructions=[], node=@node)

  debug :query, node: node, xpath_instructions: xpath_instructions

  row = xpath_instructions.shift
  method_name, *args = row    

  return query xpath_instructions, node if row == :|
  
  if row.is_a? Array and row.first.is_a? Array then      
    
    unless row.any? {|x| x == :|} then
      
      return query row + xpath_instructions, node         
    else

      a = row

      a2 = a.inject([[]]) do |r, x|

        if x != :| then

          if r.last.is_a? Array then
            r.last << x
          else
            r << [x]
          end

        else
          r.unshift x
          r << []
        end
        r
      end

      name = a2.shift
      r3 =  method(name).call(a2, node)
      return r3
      
    end
  end

  result = if method_name == :predicate then

    result2 = method(method_name.to_sym).call node, args,[]
    
    if result2 and xpath_instructions.any? then
      query xpath_instructions, node
    else
      result2
    end
    
  else

    r3 = method(method_name.to_sym).call node, args, xpath_instructions
    r3
  end

  result.is_a?(Array) ? result.flatten : result

end