Class: Locator::Xpath

Inherits:
Array
  • Object
show all
Defined in:
lib/locator/xpath.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name = nil, attributes = {}) ⇒ Xpath

Returns a new instance of Xpath.



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# File 'lib/locator/xpath.rb', line 11

def initialize(name = nil, attributes = {})
  super(Array(name || '*').map { |name| self.class.xpath?(name) ? name : ".//#{name}" })

  attributes.each do |name, value|
    case name
    when :class
      and!(has_class(name, value))
    else
      and!(equals(name, value))
    end
  end

  flatten!
end

Class Method Details

.xpath?(string) ⇒ Boolean

Returns:



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# File 'lib/locator/xpath.rb', line 6

def xpath?(string)
  string =~ %r(^\.?//)
end

Instance Method Details

#and!(other) ⇒ Object 



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# File 'lib/locator/xpath.rb', line 45

def and!(other)
  replace(self.map { |l| Array(other).map { |r| "#{l}#{r}" } }.flatten)
end

#contains(value) ⇒ Object 



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# File 'lib/locator/xpath.rb', line 41

def contains(value)
  "/descendant-or-self::*[contains(., \"#{value}\")]"
end

#equals(names, values) ⇒ Object 



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# File 'lib/locator/xpath.rb', line 26

def equals(names, values)
  case values
  when TrueClass
    "[@#{names}]"
  else
    values = Array(values).map { |value| quote(value) }
    expr= Array(names).map { |name| values.map { |value| "@#{name}=#{value}" } }.flatten
    expr.empty? ? '' : '[' + expr.join(' or ') + ']'
  end
end

#has_class(name, value) ⇒ Object 



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# File 'lib/locator/xpath.rb', line 37

def has_class(name, value)
  "[contains(concat(' ', @#{name}, ' '), concat(' ', \"#{value}\", ' '))]"
end

#or!(other) ⇒ Object 



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# File 'lib/locator/xpath.rb', line 49

def or!(other)
  other.empty? ? self : replace([self.dup, other])
end

#to_s ⇒ Object 



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# File 'lib/locator/xpath.rb', line 53

def to_s
  flatten.join(' | ')
end