Class: REXML::XPathParser
Overview
You don’t want to use this class. Really. Use XPath, which is a wrapper for this class. Believe me. You don’t want to poke around in here. There is strange, dark magic at work in this code. Beware. Go back! Go back while you still can!
Constant Summary
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- LITERAL =
/^'([^']*)'|^"([^"]*)"/u
Constants included
from XMLTokens
REXML::XMLTokens::NAME, REXML::XMLTokens::NAMECHAR, REXML::XMLTokens::NAME_STR, REXML::XMLTokens::NCNAME_STR, REXML::XMLTokens::NMTOKEN, REXML::XMLTokens::NMTOKENS, REXML::XMLTokens::REFERENCE
Instance Method Summary
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Constructor Details
Returns a new instance of XPathParser.
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# File 'lib/rexml/xpath_parser.rb', line 49
def initialize( )
@parser = REXML::Parsers::XPathParser.new
@namespaces = nil
@variables = {}
end
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Instance Method Details
#[]=(variable_name, value) ⇒ Object
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# File 'lib/rexml/xpath_parser.rb', line 86
def []=( variable_name, value )
@variables[ variable_name ] = value
end
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#first(path_stack, node) ⇒ Object
Performs a depth-first (document order) XPath search, and returns the first match. This is the fastest, lightest way to return a single result.
FIXME: This method is incomplete!
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# File 'lib/rexml/xpath_parser.rb', line 95
def first( path_stack, node )
return nil if path.size == 0
case path[0]
when :document
return first( path[1..-1], node )
when :child
for c in node.children
r = first( path[1..-1], c )
return r if r
end
when :qname
name = path[2]
if node.name == name
return node if path.size == 3
return first( path[3..-1], node )
else
return nil
end
when :descendant_or_self
r = first( path[1..-1], node )
return r if r
for c in node.children
r = first( path, c )
return r if r
end
when :node
return first( path[1..-1], node )
when :any
return first( path[1..-1], node )
end
return nil
end
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#get_first(path, nodeset) ⇒ Object
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# File 'lib/rexml/xpath_parser.rb', line 73
def get_first path, nodeset
path_stack = @parser.parse( path )
first( path_stack, nodeset )
end
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#match(path_stack, nodeset) ⇒ Object
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# File 'lib/rexml/xpath_parser.rb', line 136
def match( path_stack, nodeset )
r = expr( path_stack, nodeset )
r
end
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#namespaces=(namespaces = {}) ⇒ Object
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# File 'lib/rexml/xpath_parser.rb', line 55
def namespaces=( namespaces={} )
Functions::namespace_context = namespaces
@namespaces = namespaces
end
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#parse(path, nodeset) ⇒ Object
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# File 'lib/rexml/xpath_parser.rb', line 65
def parse path, nodeset
path_stack = @parser.parse( path )
match( path_stack, nodeset )
end
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#predicate(path, nodeset) ⇒ Object
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# File 'lib/rexml/xpath_parser.rb', line 81
def predicate path, nodeset
path_stack = @parser.parse( path )
expr( path_stack, nodeset )
end
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#variables=(vars = {}) ⇒ Object
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# File 'lib/rexml/xpath_parser.rb', line 60
def variables=( vars={} )
Functions::variables = vars
@variables = vars
end
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