Class: RexleXPath

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

Instance Method Summary collapse

Constructor Details

#initialize(node = nil) ⇒ RexleXPath

Returns a new instance of RexleXPath.



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# File 'lib/rexle-xpath.rb', line 10

def initialize(node=nil)

  @node = node

end

Instance Method Details

#parse(s) ⇒ Object 



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# File 'lib/rexle-xpath.rb', line 16

def parse(s)

  case s
    
  # it's an xpath function
  when /^(\w+)\(\)$/
    @node.method(($1).to_sym).call
  else
    query @node, RexleXPathParser.new(s).to_a
  end
end

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



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# File 'lib/rexle-xpath.rb', line 28

def query(node=@node, xpath_instructions)

  r = []

  row = xpath_instructions.shift    
  
  method_name, *args = row

  return query node, row if row.first.is_a? Array
  
  result = if method_name.to_sym == :select then

    method(:select).call node, args, xpath_instructions
    
  elsif method_name.to_sym == :text or method_name.to_sym == :value then

    method(:value).call node, args, xpath_instructions
    
  elsif method_name.to_sym == :predicate then

    method(:predicate).call node, args, xpath_instructions      
    
  elsif row.is_a? Array then
    query node, row
  else
    []
  end

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

end