# frozen_string_literal: false

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require 'xmlscan/scanner'

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require 'stringio'

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module RSS

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class XMLScanParser < BaseParser

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class << self

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def listener

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XMLScanListener

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end

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end

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private

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def _parse

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begin

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if @rss.is_a?(String)

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input = StringIO.new(@rss)

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else

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input = @rss

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end

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scanner = XMLScan::XMLScanner.new(@listener)

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scanner.parse(input)

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rescue XMLScan::Error => e

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lineno = e.lineno || scanner.lineno || input.lineno

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raise NotWellFormedError.new(lineno){e.message}

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end

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end

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end

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class XMLScanListener < BaseListener

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include XMLScan::Visitor

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include ListenerMixin

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ENTITIES = {

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'lt' => '<',

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'gt' => '>',

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'amp' => '&',

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'quot' => '"',

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'apos' => '\''

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}

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def on_xmldecl_version(str)

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@version = str

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end

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def on_xmldecl_encoding(str)

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@encoding = str

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end

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def on_xmldecl_standalone(str)

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@standalone = str

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end

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def on_xmldecl_end

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xmldecl(@version, @encoding, @standalone == "yes")

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end

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alias_method(:on_pi, :instruction)

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alias_method(:on_chardata, :text)

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alias_method(:on_cdata, :text)

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def on_etag(name)

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tag_end(name)

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end

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def on_entityref(ref)

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text(entity(ref))

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end

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def on_charref(code)

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text([code].pack('U'))

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end

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alias_method(:on_charref_hex, :on_charref)

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def on_stag(name)

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@attrs = {}

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end

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def on_attribute(name)

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@attrs[name] = @current_attr = ''

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end

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def on_attr_value(str)

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@current_attr << str

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end

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def on_attr_entityref(ref)

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@current_attr << entity(ref)

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end

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def on_attr_charref(code)

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@current_attr << [code].pack('U')

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end

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alias_method(:on_attr_charref_hex, :on_attr_charref)

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def on_stag_end(name)

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tag_start(name, @attrs)

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end

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def on_stag_end_empty(name)

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tag_start(name, @attrs)

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tag_end(name)

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end

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private

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def entity(ref)

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ent = ENTITIES[ref]

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if ent

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ent

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else

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wellformed_error("undefined entity: #{ref}")

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end

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end

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end

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end

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