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# Copyright 2011-2013 Amazon.com, Inc. or its affiliates. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"). You
# may not use this file except in compliance with the License. A copy of
# the License is located at
#
# http://aws.amazon.com/apache2.0/
#
# or in the "license" file accompanying this file. This file is
# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
# ANY KIND, either express or implied. See the License for the specific
# language governing permissions and limitations under the License.
module AWS
module Core
module XML
# @api private
module FrameStack
# @param [Hash] rules A hash of parser rules. These
# rules are typically generated by an {XML::Grammar}.
def initialize rules
@frame = RootFrame.new(rules)
end
def sax_parse xml
raise NotImplementedError
end
protected :sax_parse
# Parses the xml string and returns a hash with the resutls.
# @param [String] xml
# @return [Hash]
def parse xml
sax_parse(xml)
@frame.value
end
# Increase the frame stack level by one.
# @param [String] element_name The name of the xml opening tag.
# @param [Hash] attributes A hash of xml element attributes.
# @return [nil]
def start_element element_name, attributes = {}
@frame = @frame.build_child_frame(element_name)
self.attributes(attributes)
nil
end
# Increase the frame stack level by one by treating
# xml element attributes as nested elements.
# @param [Hash] attributes A hash of attributes names to values.
# @return [nil]
def attributes attributes
attributes.each_pair do |attr_name, attr_value|
attr_frame = @frame.build_child_frame(attr_name)
attr_frame.add_text(attr_value)
@frame.consume_child_frame(attr_frame)
end
nil
end
# Pops the top frame off the stack. When closing frames
# their final value is computed.
# @overload end_element
# @return [nil]
def end_element *ignored
parent = @frame.parent_frame
child = @frame
parent.consume_child_frame(child)
@frame = @frame.parent_frame
nil
end
# Adds text to the current frame. Frames that only contain
# text and no child elements are leaf nodes and have
# raw string values.
def set_text text
@frame.add_text(text) if @frame
end
end
end
end
end
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