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require "ox" unless defined?(Ox)
# Each MultiXml parser is expected to parse an XML document into a Hash. The
# conversion rules are:
#
# - Each document starts out as an empty Hash.
#
# - Reading an element created an entry in the parent Hash that has a key of
# the element name and a value of a Hash with attributes as key value
# pairs. Children are added as described by this rule.
#
# - Text and CDATE is stored in the parent element Hash with a key of
# MultiXml::CONTENT_ROOT and a value of the text itself.
#
# - If a key already exists in the Hash then the value associated with the key
# is converted to an Array with the old and new value in it.
#
# - Other elements such as the xml prolog, doctype, and comments are ignored.
#
module MultiXml
module Parsers
module Ox # :nodoc:
module_function
def parse_error
Exception
end
def parse(io)
handler = Handler.new
::Ox.sax_parse(handler, io, convert_special: true, skip: :skip_return)
handler.doc
end
class Handler
attr_accessor :stack
def initialize
@stack = []
end
def doc
@stack[0]
end
def attr(name, value)
append(name, value) unless @stack.empty?
end
def text(value)
append(MultiXml::CONTENT_ROOT, value)
end
def cdata(value)
append(MultiXml::CONTENT_ROOT, value)
end
def start_element(name)
@stack.push({}) if @stack.empty?
h = {}
append(name, h)
@stack.push(h)
end
def end_element(_)
@stack.pop
end
def error(message, line, column)
raise(StandardError, "#{message} at #{line}:#{column}")
end
def append(key, value)
key = key.to_s
h = @stack.last
if h.key?(key)
v = h[key]
if v.is_a?(Array)
v << value
else
h[key] = [v, value]
end
else
h[key] = value
end
end
end
end
end
end
|
