Re: Accessing "external" tables from within LuaExpat callbacks

[Michael Bauroth <Michael.Bauroth@...>]

Unfortunately that's not the problem :(

I've changed the example a little bit:

local module = {}

function module:cb( plugin, tag, attribute, value )
  if ( attribute == "value" ) then
    plugin[ 1 ] = value
    plugin[ 2 ] = value  <-- Exception
  end
end

function module:LoadPlugins( path, dirs )
  local lom = require "lxp"
  local plugin = {}
  plugin[ 1 ] = "anything"  <-- Initializing a pseudo field
	
  local callbacks = {
    StartElement = function( parser, name, attributes )
      for _, attribute in pairs( attributes ) do
        module.cb( self, plugin, name, attribute, attributes[ attribute ] )
      end
    end,
    EndElement = function( parser, name ) end,
    CharacterData = false
  }
	
  local xml_file = "info.plist"
  local parser = lxp.new( callbacks )
  local file = assert( io.open( xml_file .. "", "r" ) )
		
  parser:parse( file:read( "*all" ) )
		
  file:close();
  collectgarbage()
  parser:parse()         -- Beendet das Dokument
  parser:close()         -- Schließt den Parser
end

It seems, that the new allocation of fields in the table generates the 
error. If I modify only the value plugin[ 1 ] in function cb, all works 
fine. If I try to create a new entry like plugin[ 2 ], the error occurs.

Best Regards
Micha



Javier Guerra schrieb:
> On Mon, Apr 20, 2009 at 5:38 AM, Michael Bauroth
> <Michael.Bauroth@falcom.de> wrote:
> >    for _, attribute in pairs( attributes ) do
> >      cb( name, attribute, attributes[ attribute ] )
> >    end
>
> i think here's your problem, the attributes table uses the 'array' and
> 'map' parts of the table for different purposes, but using
> pairs(attributes) you iterate over all of them.  change to ipairs() to
> read the attribute names in order.