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from ply import lex, yacc
t_A = 'A'
t_B = 'B'
t_C = 'C'
tokens = ('A', 'B', 'C')
the_lexer = lex.lex()
def t_error(t):
pass
def p_error(p):
pass
def p_start(t):
'''start : A nest C'''
pass
def p_nest(t):
'''nest : B'''
print(t[-1])
the_parser = yacc.yacc(debug = False)
the_parser.parse('ABC', the_lexer)
the_parser.parse('ABC', the_lexer, tracking=True)
the_parser.parse('ABC', the_lexer, tracking=True, debug=1)
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