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require "libxml"
require "stringio"
require_relative "sax_handler"
module MultiXml
module Parsers
# SAX-based parser using LibXML (faster for large documents)
#
# @api private
module LibxmlSax
module_function
# Get the parse error class for this parser
#
# @api private
# @return [Class] LibXML::XML::Error
def parse_error = ::LibXML::XML::Error
# Parse XML from a string or IO object
#
# @api private
# @param xml [String, IO] XML content
# @return [Hash] Parsed XML as a hash
# @raise [LibXML::XML::Error] if XML is malformed
def parse(xml)
io = xml.respond_to?(:read) ? xml : StringIO.new(xml)
return {} if io.eof?
LibXML::XML::Error.set_handler(&LibXML::XML::Error::QUIET_HANDLER)
handler = Handler.new
parser = ::LibXML::XML::SaxParser.io(io)
parser.callbacks = handler
parser.parse
handler.result
end
# LibXML SAX handler that builds a hash tree while parsing
#
# @api private
class Handler
include ::LibXML::XML::SaxParser::Callbacks
include SaxHandler
# Create a new SAX handler
#
# @api private
# @return [Handler] new handler instance
def initialize
initialize_handler
end
# Handle start of document (no-op)
#
# @api private
# @return [void]
def on_start_document
end
# Handle end of document (no-op)
#
# @api private
# @return [void]
def on_end_document
end
# Handle parse errors (no-op, LibXML raises directly)
#
# @api private
# @param _error [String] Error message (unused)
# @return [void]
def on_error(_error)
end
# Handle start of an element
#
# @api private
# @param name [String] Element name
# @param attrs [Hash] Element attributes
# @return [void]
def on_start_element(name, attrs = {})
handle_start_element(name, attrs)
end
# Handle end of an element
#
# @api private
# @param _name [String] Element name (unused)
# @return [void]
def on_end_element(_name)
handle_end_element
end
# Handle character data
#
# @api private
# @param text [String] Text content
# @return [void]
def on_characters(text) = append_text(text)
alias_method :on_cdata_block, :on_characters
end
end
end
end
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