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
|
package driver
import (
"strings"
"testing"
"github.com/nihei9/vartan/grammar"
"github.com/nihei9/vartan/spec"
)
func TestParser_Parse(t *testing.T) {
tests := []struct {
specSrc string
src string
}{
{
specSrc: `
expr
: expr "\+" term
| term
;
term
: term "\*" factor
| factor
;
factor
: "\(" expr "\)"
| id
;
id: "[A-Za-z_][0-9A-Za-z_]*";
`,
src: `(a+(b+c))*d+e`,
},
{
specSrc: `
mode_tran_seq
: mode_tran_seq mode_tran
| mode_tran
;
mode_tran
: push_m1
| push_m2
| pop_m1
| pop_m2
;
push_m1: "->" # push m1;
@mode m1
push_m2: "-->" # push m2;
@mode m1
pop_m1 : "<-" # pop;
@mode m2
pop_m2: "<--" # pop;
`,
src: `->--><--<-`,
},
{
specSrc: `
s
: foo bar
;
foo: "foo";
@mode default
bar: "bar";
`,
src: `foobar`,
},
// The parser can skips specified tokens.
{
specSrc: `
s
: foo bar
;
foo: "foo";
bar: "bar";
white_space: "[\u{0009}\u{0020}]+" # skip;
`,
src: `foo bar`,
},
}
for _, tt := range tests {
ast, err := spec.Parse(strings.NewReader(tt.specSrc))
if err != nil {
t.Fatal(err)
}
g, err := grammar.NewGrammar(ast)
if err != nil {
t.Fatal(err)
}
gram, err := grammar.Compile(g)
if err != nil {
t.Fatal(err)
}
p, err := NewParser(gram, strings.NewReader(tt.src))
if err != nil {
t.Fatal(err)
}
err = p.Parse()
if err != nil {
t.Fatal(err)
}
printCST(p.GetCST(), 0)
}
}
|
