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
|
#!/usr/bin/env python3
import sys
import ply.yacc as yacc
from ply.lex import LexToken
# Get the token map from the lexer. This is required.
from lexer import tokens
# Error rule for syntax errors
def p_error(p: LexToken):
if p:
print(f"Unexpected {repr(p.value)} on line {p.lineno}")
else:
print("Unexpected end of file.")
def p_program(p):
"""program : instruction_list
| empty
"""
pass
def p_empty(p):
"""empty :"""
pass
def p_inss(p):
"""instruction_list : instruction_list line
| line
"""
if len(p) == 2:
p[0] = [p[1]]
else:
p[0] = p[1] + [p[2]]
# print(f"INSes: {len(p)}")
# print(f" {p[1]}")
# if len(p) > 2:
# print(f" {p[2]}")
pass
def p_inss2(p):
"""instruction_list2 : line instruction_list2
| line
"""
if len(p) == 2:
p[0] = [p[1]]
else:
p[0] = [p[1]] + p[2]
print(f"INSes2: {len(p)}")
print(f" {p[1]}")
if len(p) > 2:
print(f" {p[2]}")
pass
def p_line(p):
"""line : instruction NL
| NL
"""
if len(p) == 2:
pass
else:
p[0] = p[1]
def p_instruction(p):
"""instruction : noarg
| onearg
| twoarg
| jumpdest
| invalid_arg
"""
print(f"Item: {p[1]}")
p[0] = p[1]
pass
def p_jumpdest(p):
"""jumpdest : SYMBOL COLON"""
p[0] = (p[1],)
def p_twoarg(p):
"""twoarg : op REG COMMA argument COMMA argument"""
p[0] = (*p[1], p[2], p[4], p[6])
pass
def p_argument(p):
"""argument : number
| REG
| SYMBOL
"""
pass
def p_onearg(p):
"""onearg : op REG COMMA argument"""
p[0] = (*p[1], p[2], p[4], None)
pass
def p_noarg(p):
"""noarg : op"""
p[0] = (*p[1], None, None, None)
pass
def p_invalid_arg(p):
"""invalid_arg : op argument"""
print(f"Invalid opcode, destination missing: {p[1:]}")
sys.exit(1)
pass
def p_op(p):
"""op : OP DOT JUMP
| OP
"""
if len(p) == 2:
p[0] = (p[1], None)
else:
p[0] = (p[1], p[3])
def p_number(p):
"""number : NUMBER
| HEXNUMBER
"""
p[0] = p[1]
parser = yacc.yacc()
|
