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Contents
# :stopdoc:
module HTree
class Context
DefaultNamespaces = {'xml'=>'http://www.w3.org/XML/1998/namespace'}
DefaultNamespaces.default = ""
DefaultNamespaces.freeze
# 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.
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
attr_reader :namespaces
# return a namespace URI corresponding to _prefix_.
# It returns nil if _prefix_ is not defined.
def namespace_uri(prefix)
@namespaces[prefix]
end
# generate a new Context object which namespaces are substituted by
# a hash _declared_namespaces_.
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
private
def check_namespace_prefix(k)
unless (String === k && !k.empty?) || k == nil
raise ArgumentError, "invalid namespace prefix: #{k.inspect}"
end
end
def check_namespace_uri(v)
unless String === v
raise ArgumentError, "invalid namespace URI: #{v.inspect}"
end
end
end
DefaultContext = Context.new
HTMLContext = DefaultContext.subst_namespaces(nil=>"http://www.w3.org/1999/xhtml")
end
# :startdoc:
Version data entries
27 entries across 27 versions & 1 rubygems