udts.py File Reference

Example of using User-Defined Terminals (UDTs). More...

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Namespaces
	examples.basics.udts

Functions
def	examples.basics.udts.anbncn (cb_data)

Variables
string	examples.basics.udts.title
string	examples.basics.udts.abnf_syntax = 'S = u_anbncn\n'
	examples.basics.udts.api = Api()
	examples.basics.udts.grammar = api.generate(abnf_syntax)
	examples.basics.udts.parser = Parser(grammar)
string	examples.basics.udts.input_string = 'aaabbbccc'
	examples.basics.udts.result = parser.parse(utils.string_to_tuple(input_string))

Detailed Description

Example of using User-Defined Terminals (UDTs).

A well-known non-context free language is L ={aⁿbⁿcⁿ | n>0}. It is shown there how to parse this using look ahead operators and that will be demonstrated in the look ahead example, examples/basics/look_ahead.py. Here, we demonstrate a more brute-force method - namely simply hand writting a code snippet to match the language.

Definition in file udts.py.