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
|
%union
{
int
i;
size_t/*unsigned*/
u;
std::string
*s;
};
%type<i>
NUMBER
number
%class-name Parser
%filenames parser
%parsefun-source parse.cc
%debug
%token NUMBER
%%
startrule:
expressions
'q'
{
cout << "Done\n";
ACCEPT();
}
;
expressions:
expressions
expression
|
expression
;
expression:
number
'+'
number
'='
{
cout << $1 << " + " << $3 << " = " << $1 + $3 << endl;
}
;
number:
NUMBER
{
$$ = atoi(d_scanner.YYText());
cout << "Saw " << d_scanner.YYText() << endl;
}
;
|
