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