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
|
import textwrap
import pyparsing as pp
from examples.tiny.tiny_parser import parse_tiny
ppt = pp.testing
def _test_tiny_code(code: str):
print()
print(ppt.with_line_numbers(code))
try:
result = parse_tiny(code)
except pp.ParseException as pe:
print(pe.explain())
raise
else:
print(result.dump())
#
# code examples taken from https://a7medayman6.github.io/Tiny-Compiler/Language-Description.html
#
def test_tiny_grammar():
code = textwrap.dedent("""\
int sum(int a, int b)
{
return a + b;
}
int main()
{
int val, counter;
read val;
counter := 0;
repeat
val := val - 1;
write "Iteration number [";
write counter;
write "] the value of x = ";
write val;
write endl;
counter := counter+1;
until val = 1
write endl;
string s := "number of Iterations = ";
write s;
counter := counter-1;
write counter;
/* complicated equation */
float z1 := 3*2*(2+1)/2-5.3;
z1 := z1 + sum(a,y);
if z1 > 5 || z1 < counter && z1 = 1
then
write z1;
elseif z1 < 5
then
z1 := 5;
else
z1 := counter;
end
return 0;
}
""")
_test_tiny_code(code)
def test_tiny_grammar_factorial():
code = """\
/* Sample program in Tiny language – computes factorial*/
int main()
{
int x;
read x; /*input an integer*/
if x > 0 /*don’t compute if x <= 0 */
then
int fact := 1;
repeat
fact := fact * x;
x := x - 1;
until x = 0
write fact; /*output factorial of x*/
end
return 0;
}
"""
_test_tiny_code(code)
|
