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require 'xmlscan/scanner'
require 'stringio'
module RSS
class XMLScanParser < BaseParser
class << self
def listener
XMLScanListener
end
end
private
def _parse
begin
if @rss.is_a?(String)
input = StringIO.new(@rss)
else
input = @rss
end
scanner = XMLScan::XMLScanner.new(@listener)
scanner.parse(input)
rescue XMLScan::Error => e
lineno = e.lineno || scanner.lineno || input.lineno
raise NotWellFormedError.new(lineno){e.message}
end
end
end
class XMLScanListener < BaseListener
include XMLScan::Visitor
include ListenerMixin
ENTITIES = {
'lt' => '<',
'gt' => '>',
'amp' => '&',
'quot' => '"',
'apos' => '\''
}
def on_xmldecl_version(str)
@version = str
end
def on_xmldecl_encoding(str)
@encoding = str
end
def on_xmldecl_standalone(str)
@standalone = str
end
def on_xmldecl_end
xmldecl(@version, @encoding, @standalone == "yes")
end
alias_method(:on_pi, :instruction)
alias_method(:on_chardata, :text)
alias_method(:on_cdata, :text)
def on_etag(name)
tag_end(name)
end
def on_entityref(ref)
text(entity(ref))
end
def on_charref(code)
text([code].pack('U'))
end
alias_method(:on_charref_hex, :on_charref)
def on_stag(name)
@attrs = {}
end
def on_attribute(name)
@attrs[name] = @current_attr = ''
end
def on_attr_value(str)
@current_attr << str
end
def on_attr_entityref(ref)
@current_attr << entity(ref)
end
def on_attr_charref(code)
@current_attr << [code].pack('U')
end
alias_method(:on_attr_charref_hex, :on_attr_charref)
def on_stag_end(name)
tag_start(name, @attrs)
end
def on_stag_end_empty(name)
tag_start(name, @attrs)
tag_end(name)
end
private
def entity(ref)
ent = ENTITIES[ref]
if ent
ent
else
wellformed_error("undefined entity: #{ref}")
end
end
end
end
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