import ply.lex as lex
import ply.yacc as yacc
tokens = ['VOWEL','CONSONANT']

t_VOWEL = r'[AEIOUaeiou]'
t_CONSONANT = r'[A-Za-z]'

def t_error(token):
    print(f'Illegal character: {token.value} on line number {t.lineno}')
    token.lexer.skip(1)

def t_whitespace(t):
    r'\s+'
    pass

lexer = lex.lex()

tokens_generated = []

def p_expression(p):
    '''
    expression : vowel_list consonant_list
    '''

    print(dir(p.lexer))
    print(p.stack)
    print('Derivation complete!')
    print(f'The tokens generated are: {tokens_generated}')


def p_vowel_list(p):
    '''
    vowel_list : VOWEL vowel_list
                | VOWEL
    '''
    print(f'Derived the vowel {p[1]} !')
    tokens_generated.append(p[1])

def p_consonant_list(p):
    '''
    consonant_list : CONSONANT consonant_list
                    | CONSONANT
    '''
    print(f'Derived the consonant {p[1]}!')
    tokens_generated.append(p[1])


def p_error(p):
    if p == None:
        token = "end of file"
    else:
        token = f"{p.type}({p.value}) on line {p.lineno}"

input_string = 'EUAIOTNC'

parser = yacc.yacc(method='LALR',debug=True)
parser.parse(input_string)