ModelChecker/converter.py at master · Amithabh-A/ModelChecker · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
"""
parser and AST generator (represented by temporal operators {EG, EU, EX})
for CTL formula
"""

import copy

from ply import yacc

from lexer import tokens

# Grammar rules and precedence
precedence = (
    ("left", "OR"),
    ("left", "AND"),
    ("right", "NOT"),
    ("left", "IMP"),
    ("right", "AG"),
    ("right", "EG"),
    ("right", "AF"),
    ("right", "EF"),
    ("right", "AX"),
    ("right", "EX"),
    ("right", "A"),
    ("right", "E"),
)


# Define parser rules here...
def p_formula_paren(p):
    """
    formula : LPAREN formula RPAREN
    """
    p[0] = p[2]


def p_formula_var(p):
    """
    formula : VAR
    """
    p[0] = ("VAR", p[1])


def p_formula_t(p):
    """
    formula : T
    """
    p[0] = ("T",)


def p_formula_n(p):
    """
    formula : N
    """
    p[0] = ("NOT", ("T",))


def p_formula_and(p):
    """
    formula : formula AND formula
    """
    p[0] = ("AND", p[1], p[3])


def p_formula_or(p):
    """
    formula : formula OR formula
    """
    p[0] = ("OR", p[1], p[3])


def p_formula_not(p):
    """
    formula : NOT formula
    """
    p[0] = ("NOT", p[2])


def p_formula_imp(p):
    """
    formula : formula IMP formula
    """
    p[0] = ("IMP", p[1], p[3])


def p_formula_ax(p):
    """
    formula : AX formula
    """
    # p[0] = ("AX", p[2])
    # AX ϕ = ¬ (EX ¬ϕ)
    p[0] = ("NOT", ("EX", ("NOT", p[2])))


def p_formula_ex(p):
    """
    formula : EX formula
    """
    p[0] = ("EX", p[2])


def p_formula_ef(p):
    """
    formula : EF formula
    """
    # p[0] = ("EF", p[2])
    # EF ϕ  = E [T U ϕ]
    p[0] = ("EU", ("T",), p[2])


def p_formula_ag(p):
    """
    formula : AG formula
    """
    # p[0] = ("ag", p[2])
    # ag ϕ = ¬(ef ¬ϕ) = ¬(eu (T, ¬ϕ ))
    p[0] = ("NOT", ("EU", ("T",), ("NOT", p[2])))


def p_formula_eg(p):
    """
    formula : EG formula
    """
    p[0] = ("EG", p[2])


def p_formula_af(p):
    """
    formula : AF formula
    """
    # p[0] = ("AF", p[2])
    # AF ϕ = ¬(EG ¬ϕ)
    p[0] = ("NOT", ("EG", ("NOT", p[2])))


def p_formula_au(p):
    """
    formula : A LSQUARE formula U formula RSQUARE
    """
    # p[0] = ("AU", p[3], p[5])
    p[0] = (
        "NOT",
        (
            "OR",
            (
                "EU",
                ("NOT", p[5]),
                ("AND", ("NOT", p[3]), ("NOT", p[5])),
            ),
            ("EG", ("NOT", p[5])),
        ),
    )


def p_formula_eu(p):
    """
    formula : E LSQUARE formula U formula RSQUARE
    """
    p[0] = ("EU", p[3], p[5])


# Error handling rule
def p_error(p):
    if p:
        print(
            f"Syntax error at line {p.lineno}, position {p.lexpos}: Unexpected token '{p.value}'"
        )
    else:
        print("Syntax error: Unexpected end of input")


# Build the parser
parser = yacc.yacc()