diff options
Diffstat (limited to 'activesupport/lib/active_support/xml_mini/jdom.rb')
| -rw-r--r-- | activesupport/lib/active_support/xml_mini/jdom.rb | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/xml_mini/jdom.rb b/activesupport/lib/active_support/xml_mini/jdom.rb new file mode 100644 index 0000000000..d795d55690 --- /dev/null +++ b/activesupport/lib/active_support/xml_mini/jdom.rb @@ -0,0 +1,162 @@ +raise "JRuby is required to use the JDOM backend for XmlMini" unless RUBY_PLATFORM =~ /java/ + +require 'jruby' +include Java + +import javax.xml.parsers.DocumentBuilder unless defined? DocumentBuilder +import javax.xml.parsers.DocumentBuilderFactory unless defined? DocumentBuilderFactory +import java.io.StringReader unless defined? StringReader +import org.xml.sax.InputSource unless defined? InputSource +import org.xml.sax.Attributes unless defined? Attributes +import org.w3c.dom.Node unless defined? Node + +# = XmlMini JRuby JDOM implementation +module ActiveSupport + module XmlMini_JDOM #:nodoc: + extend self + + CONTENT_KEY = '__content__'.freeze + + NODE_TYPE_NAMES = %w{ATTRIBUTE_NODE CDATA_SECTION_NODE COMMENT_NODE DOCUMENT_FRAGMENT_NODE + DOCUMENT_NODE DOCUMENT_TYPE_NODE ELEMENT_NODE ENTITY_NODE ENTITY_REFERENCE_NODE NOTATION_NODE + PROCESSING_INSTRUCTION_NODE TEXT_NODE} + + node_type_map = {} + NODE_TYPE_NAMES.each { |type| node_type_map[Node.send(type)] = type } + + # Parse an XML Document string into a simple hash using Java's jdom. + # string:: + # XML Document string to parse + def parse(string) + if string.blank? + {} + else + @dbf = DocumentBuilderFactory.new_instance + xml_string_reader = StringReader.new(string) + xml_input_source = InputSource.new(xml_string_reader) + doc = @dbf.new_document_builder.parse(xml_input_source) + merge_element!({}, doc.document_element) + 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) + merge!(hash, element.tag_name, collapse(element)) + end + + # Actually converts an XML document element into a data structure. + # + # element:: + # The document element to be collapsed. + def collapse(element) + hash = get_attributes(element) + + child_nodes = element.child_nodes + if child_nodes.length > 0 + for i in 0...child_nodes.length + child = child_nodes.item(i) + merge_element!(hash, child) unless child.node_type == Node.TEXT_NODE + end + 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 emement to. + # element:: + # XML element whose texts are to me merged into the hash + def merge_texts!(hash, element) + text_children = texts(element) + if text_children.join.empty? + hash + else + # must use value to prevent double-escaping + merge!(hash, CONTENT_KEY, text_children.join) + 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) + attribute_hash = {} + attributes = element.attributes + for i in 0...attributes.length + attribute_hash[attributes.item(i).name] = attributes.item(i).value + end + attribute_hash + end + + # Determines if a document element has text content + # + # element:: + # XML element to be checked. + def texts(element) + texts = [] + child_nodes = element.child_nodes + for i in 0...child_nodes.length + item = child_nodes.item(i) + if item.node_type == Node.TEXT_NODE + texts << item.get_data + end + end + texts + end + + # Determines if a document element has text content + # + # element:: + # XML element to be checked. + def empty_content?(element) + text = '' + child_nodes = element.child_nodes + for i in 0...child_nodes.length + item = child_nodes.item(i) + if item.node_type == Node.TEXT_NODE + text << item.get_data.strip + end + end + text.strip.length == 0 + end + end +end |