3 from ply import lex, yacc
7 tokens = ('NAME', 'AND_OP', 'OR_OP', 'NOT_OP', 'SP1')
9 t_NAME = '[a-z][a-z0-9_]*'
20 """Avoid warnings on stderr"""
24 def p_expression_name(p):
25 """expression : NAME"""
28 def p_expression_and_and(p):
29 """expression : expression SP0 AND_OP AND_OP SP0 expression"""
30 p[0] = ('AND', p[1], p[6])
32 def p_expression_and(p):
33 """expression : expression SP0 AND_OP SP0 expression"""
34 p[0] = ('AND', p[1], p[5])
36 def p_expression_not(p):
37 """expression : NOT_OP SP0 expression"""
40 def p_expression_or_or(p):
41 """expression : expression SP0 OR_OP OR_OP SP0 expression"""
42 p[0] = ('OR', p[1], p[6])
44 def p_expression_or(p):
45 """expression : expression SP0 OR_OP SP0 expression"""
46 p[0] = ('OR', p[1], p[5])
48 def p_expression_parens(p):
49 """expression : '(' SP0 expression SP0 ')'"""
50 p[0] = ('PARENS', p[3])
61 """Avoid warnings on stderr"""