Class | REXML::XPath |
In: |
lib/rexml/xpath.rb
|
Parent: | Object |
EMPTY_HASH | = | {} |
Iterates over nodes that match the given path, calling the supplied block with the match.
element: | The context element |
path: | The xpath to search for. If not supplied or nil, defaults to ’*’ |
namespaces: | If supplied, a Hash which defines a namespace mapping |
XPath.each( node ) { |el| ... } XPath.each( node, '/*[@attr='v']' ) { |el| ... } XPath.each( node, 'ancestor::x' ) { |el| ... }
# File lib/rexml/xpath.rb, line 45 45: def XPath::each element, path=nil, namespaces=nil, variables={}, &block 46: raise "The namespaces argument, if supplied, must be a hash object." unless namespaces.nil? or namespaces.kind_of?(Hash) 47: raise "The variables argument, if supplied, must be a hash object." unless variables.kind_of?(Hash) 48: parser = XPathParser.new 49: parser.namespaces = namespaces 50: parser.variables = variables 51: path = "*" unless path 52: element = [element] unless element.kind_of? Array 53: parser.parse(path, element).each( &block ) 54: end
Finds and returns the first node that matches the supplied xpath.
element: | The context element |
path: | The xpath to search for. If not supplied or nil, returns the first node matching ’*’. |
namespaces: | If supplied, a Hash which defines a namespace mapping. |
XPath.first( node ) XPath.first( doc, "//b"} ) XPath.first( node, "a/x:b", { "x"=>"http://doofus" } )
# File lib/rexml/xpath.rb, line 22 22: def XPath::first element, path=nil, namespaces=nil, variables={} 23: raise "The namespaces argument, if supplied, must be a hash object." unless namespaces.nil? or namespaces.kind_of?(Hash) 24: raise "The variables argument, if supplied, must be a hash object." unless variables.kind_of?(Hash) 25: parser = XPathParser.new 26: parser.namespaces = namespaces 27: parser.variables = variables 28: path = "*" unless path 29: element = [element] unless element.kind_of? Array 30: parser.parse(path, element).flatten[0] 31: end
Returns an array of nodes matching a given XPath.
# File lib/rexml/xpath.rb, line 57 57: def XPath::match element, path=nil, namespaces=nil, variables={} 58: parser = XPathParser.new 59: parser.namespaces = namespaces 60: parser.variables = variables 61: path = "*" unless path 62: element = [element] unless element.kind_of? Array 63: parser.parse(path,element) 64: end