52 lines
603 B
Python
52 lines
603 B
Python
|
import ply.lex as lex
|
||
|
|
import ply.yacc as yacc
|
||
|
|
|
||
|
|
tokens = [
|
||
|
|
'HOLA',
|
||
|
|
'COMA',
|
||
|
|
'QUE',
|
||
|
|
'TAL',
|
||
|
|
]
|
||
|
|
|
||
|
|
t_HOLA = r'hola'
|
||
|
|
t_COMA = r','
|
||
|
|
t_QUE = r'que'
|
||
|
|
t_TAL = r'tal'
|
||
|
|
t_ignore = r' '
|
||
|
|
|
||
|
|
|
||
|
|
def t_error(t):
|
||
|
|
print("Illegal character!")
|
||
|
|
t.lexer.skip(1)
|
||
|
|
|
||
|
|
|
||
|
|
lexer = lex.lex()
|
||
|
|
|
||
|
|
|
||
|
|
def p_phrase(p):
|
||
|
|
'''
|
||
|
|
phrase : a QUE TAL
|
||
|
|
'''
|
||
|
|
print('✓✓✓ Valid phrase')
|
||
|
|
|
||
|
|
|
||
|
|
def p_a(p):
|
||
|
|
'''
|
||
|
|
a : HOLA COMA a
|
||
|
|
| HOLA
|
||
|
|
'''
|
||
|
|
|
||
|
|
|
||
|
|
def p_error(p):
|
||
|
|
print('xxx Invalid phrase')
|
||
|
|
|
||
|
|
|
||
|
|
parser = yacc.yacc()
|
||
|
|
|
||
|
|
while True:
|
||
|
|
try:
|
||
|
|
s = input('')
|
||
|
|
except EOFError:
|
||
|
|
break
|
||
|
|
parser.parse(s)
|