require 'active_support/core_ext/kernel/reporting' require 'active_support/core_ext/object/blank' require 'stringio' # = XmlMini ReXML implementation module ActiveSupport module XmlMini_REXML #:nodoc: extend self CONTENT_KEY = '__content__'.freeze # Parse an XML Document string or IO into a simple hash # # Same as XmlSimple::xml_in but doesn't shoot itself in the foot, # and uses the defaults from Active Support. # # data:: # XML Document string or IO to parse def parse(data) if !data.respond_to?(:read) data = StringIO.new(data || '') end char = data.getc if char.nil? {} else data.ungetc(char) silence_warnings { require 'rexml/document' } unless defined?(REXML::Document) doc = REXML::Document.new(data) if doc.root merge_element!({}, doc.root, XmlMini.depth) else raise REXML::ParseException, "The document #{doc.to_s.inspect} does not have a valid root" end end end private # Convert an XML element and merge into the hash # # hash:: # Hash to merge the converted element into. # element:: # XML element to merge into hash def merge_element!(hash, element, depth) raise REXML::ParseException, "The document is too deep" if depth == 0 merge!(hash, element.name, collapse(element, depth)) end # Actually converts an XML document element into a data structure. # # element:: # The document element to be collapsed. def collapse(element, depth) hash = get_attributes(element) if element.has_elements? element.each_element {|child| merge_element!(hash, child, depth - 1) } merge_texts!(hash, element) unless empty_content?(element) hash else merge_texts!(hash, element) end end # Merge all the texts of an element into the hash # # hash:: # Hash to add the converted element to. # element:: # XML element whose texts are to me merged into the hash def merge_texts!(hash, element) unless element.has_text? hash else # must use value to prevent double-escaping texts = '' element.texts.each { |t| texts << t.value } merge!(hash, CONTENT_KEY, texts) end end # Adds a new key/value pair to an existing Hash. If the key to be added # already exists and the existing value associated with key is not # an Array, it will be wrapped in an Array. Then the new value is # appended to that Array. # # hash:: # Hash to add key/value pair to. # key:: # Key to be added. # value:: # Value to be associated with key. def merge!(hash, key, value) if hash.has_key?(key) if hash[key].instance_of?(Array) hash[key] << value else hash[key] = [hash[key], value] end elsif value.instance_of?(Array) hash[key] = [value] else hash[key] = value end hash end # Converts the attributes array of an XML element into a hash. # Returns an empty Hash if node has no attributes. # # element:: # XML element to extract attributes from. def get_attributes(element) attributes = {} element.attributes.each { |n,v| attributes[n] = v } attributes end # Determines if a document element has text content # # element:: # XML element to be checked. def empty_content?(element) element.texts.join.blank? end end end