class HTree::Context

Attributes

namespaces[R]

Public Class Methods

new(namespaces=nil) click to toggle source

The optional argument `namespaces' should be a hash or nil. HTree::DefaultNamespaces is used if nil is specified.

If it is a hash, its key should be nil or a string. nil means default namespace. The string means some prefix which must not be empty.

The hash value should be a string. The empty string “” means unbound namespace.

# File htree/context.rb, line 18
def initialize(namespaces=nil)
  namespaces ||= DefaultNamespaces
  namespaces.each_pair {|k, v|
    check_namespace_prefix(k)
    check_namespace_uri(v)
  }
  namespaces = namespaces.dup.freeze unless namespaces.frozen?
  @namespaces = namespaces
end

Public Instance Methods

namespace_uri(prefix) click to toggle source

return a namespace URI corresponding to prefix. It returns nil if prefix is not defined.

# File htree/context.rb, line 31
def namespace_uri(prefix)
  @namespaces[prefix]
end

subst_namespaces(declared_namespaces) click to toggle source

generate a new Context object which namespaces are substituted by a hash declared_namespaces.

# File htree/context.rb, line 37
def subst_namespaces(declared_namespaces)
  namespaces = @namespaces.dup
  declared_namespaces.each {|k, v|
    check_namespace_prefix(k)
    check_namespace_uri(v)
    namespaces[k] = v
  }
  if namespaces == @namespaces
    self
  else
    Context.new(namespaces)
  end
end