class XPath::Renderer
Public Class Methods
new(type)
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# File lib/xpath/renderer.rb, line 7 def initialize(type) @type = type end
render(node, type)
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# File lib/xpath/renderer.rb, line 3 def self.render(node, type) new(type).render(node) end
Public Instance Methods
anywhere(element_names)
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# File lib/xpath/renderer.rb, line 53 def anywhere(element_names) with_element_conditions("//", element_names) end
attribute(current, name)
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# File lib/xpath/renderer.rb, line 61 def attribute(current, name) "#{current}/@#{name}" end
axis(current, name, element_names)
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# File lib/xpath/renderer.rb, line 49 def axis(current, name, element_names) with_element_conditions("#{current}/#{name}::", element_names) end
binary_operator(name, left, right)
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# File lib/xpath/renderer.rb, line 65 def binary_operator(name, left, right) "(#{left} #{name} #{right})" end
child(current, element_names)
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# File lib/xpath/renderer.rb, line 45 def child(current, element_names) with_element_conditions("#{current}/", element_names) end
convert_argument(argument)
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# File lib/xpath/renderer.rb, line 16 def convert_argument(argument) case argument when Expression, Union then render(argument) when Array then argument.map { |element| convert_argument(element) } when String then string_literal(argument) when Literal then argument.value else argument.to_s end end
css(current, selector)
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# File lib/xpath/renderer.rb, line 89 def css(current, selector) paths = Nokogiri::CSS.xpath_for(selector).map do |xpath_selector| "#{current}#{xpath_selector}" end union(paths) end
descendant(current, element_names)
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# File lib/xpath/renderer.rb, line 41 def descendant(current, element_names) with_element_conditions("#{current}//", element_names) end
function(name, *arguments)
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# File lib/xpath/renderer.rb, line 100 def function(name, *arguments) "#{name}(#{arguments.join(", ")})" end
is(one, two)
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# File lib/xpath/renderer.rb, line 69 def is(one, two) if @type == :exact binary_operator("=", one, two) else function(:contains, one, two) end end
literal(node)
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# File lib/xpath/renderer.rb, line 85 def literal(node) node end
render(node)
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# File lib/xpath/renderer.rb, line 11 def render(node) arguments = node.arguments.map { |argument| convert_argument(argument) } send(node.expression, *arguments) end
string_literal(string)
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# File lib/xpath/renderer.rb, line 26 def string_literal(string) if string.include?("'") string = string.split("'", -1).map do |substr| "'#{substr}'" end.join(%q{,"'",}) "concat(#{string})" else "'#{string}'" end end
text(current)
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# File lib/xpath/renderer.rb, line 81 def text(current) "#{current}/text()" end
this_node()
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# File lib/xpath/renderer.rb, line 37 def this_node '.' end
union(*expressions)
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# File lib/xpath/renderer.rb, line 96 def union(*expressions) expressions.join(' | ') end
variable(name)
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# File lib/xpath/renderer.rb, line 77 def variable(name) "%{#{name}}" end
where(on, condition)
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# File lib/xpath/renderer.rb, line 57 def where(on, condition) "#{on}[#{condition}]" end
Private Instance Methods
with_element_conditions(expression, element_names)
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# File lib/xpath/renderer.rb, line 106 def with_element_conditions(expression, element_names) if element_names.length == 1 "#{expression}#{element_names.first}" elsif element_names.length > 1 "#{expression}*[#{element_names.map { |e| "self::#{e}" }.join(" | ")}]" else "#{expression}*" end end