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require 'libxml'
require 'active_support/core_ext/object/blank'
require 'stringio'
# = XmlMini LibXML implementation using a SAX-based parser
module ActiveSupport
module XmlMini_LibXMLSAX
extend self
# Class that will build the hash while the XML document
# is being parsed using SAX events.
class HashBuilder
include LibXML::XML::SaxParser::Callbacks
CONTENT_KEY = '__content__'.freeze
HASH_SIZE_KEY = '__hash_size__'.freeze
attr_reader :hash
def current_hash
@hash_stack.last
end
def on_start_document
@hash = { CONTENT_KEY => '' }
@hash_stack = [@hash]
end
def on_end_document
@hash = @hash_stack.pop
@hash.delete(CONTENT_KEY)
end
def on_start_element(name, attrs = {})
new_hash = { CONTENT_KEY => '' }.merge(attrs)
new_hash[HASH_SIZE_KEY] = new_hash.size + 1
case current_hash[name]
when Array then current_hash[name] << new_hash
when Hash then current_hash[name] = [current_hash[name], new_hash]
when nil then current_hash[name] = new_hash
end
@hash_stack.push(new_hash)
end
def on_end_element(name)
if current_hash.length > current_hash.delete(HASH_SIZE_KEY) && current_hash[CONTENT_KEY].blank? || current_hash[CONTENT_KEY] == ''
current_hash.delete(CONTENT_KEY)
end
@hash_stack.pop
end
def on_characters(string)
current_hash[CONTENT_KEY] << string
end
alias_method :on_cdata_block, :on_characters
end
attr_accessor :document_class
self.document_class = HashBuilder
def parse(data)
if !data.respond_to?(:read)
data = StringIO.new(data || '')
end
char = data.getc
if char.nil?
{}
else
data.ungetc(char)
LibXML::XML::Error.set_handler(&LibXML::XML::Error::QUIET_HANDLER)
parser = LibXML::XML::SaxParser.io(data)
document = self.document_class.new
parser.callbacks = document
parser.parse
document.hash
end
end
end
end
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