Parse::RecDescent is not that hard to use. It also has that event triggering of callback functions quite nicely integrated.

For example you would define a table object:

tableobject : tablestart tabledef(s) tableend { tablefunc($item[1]) }

tablestart : 'OBJECT' '=' 'TABLE' "\n" { tablestartfunc() }

tabledef : columnnumber 
          | name 
          | bytes 
          | startbyte 
          | columnobject { columnstartfunc() }
          | rows 

columnnumber : 'COLUMN_NUMBER' '=' number /\n/ 
  { $return= recordcolumn($item{number});  }

number : /\d+/

[download]
In this example tablestartfunc() would be called at the start of a table definition, tablefunc() after the whole table was parsed, recordcolumn() would be called with the number of columns as parameter.

UPDATE:
Whether you record the table information with the callbacks or by using the $return mechanism of Parse::RecDescent is your decision. In the former case tablefunc doesn't need the $item[1] parameter and columnnumber() doesn't need to set $return. In the latter case columnnumber would need a more elaborate return value, for example $return= ['columnnumber',$item{number}];

In reply to Re: Writing an ODL parser? by jethro
in thread Writing an ODL parser? by dHarry

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