-
Notifications
You must be signed in to change notification settings - Fork 0
/
literal.go
136 lines (128 loc) · 2.93 KB
/
literal.go
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
package ego
import (
"go/ast"
"reflect"
"strconv"
"github.com/bobg/ego/refl"
)
func (s *Scope) evalBasicLit(expr *ast.BasicLit) (*refl.Value, error) {
if x, err := strconv.ParseUint(expr.Value, 0, 64); err == nil {
return &Value{R: reflect.ValueOf(x)}, nil // xxx really we want an untyped int constant
}
if x, err := strconv.ParseInt(expr.Value, 0, 64); err == nil {
return &Value{R: reflect.ValueOf(x)}, nil
}
if x, err := strconv.ParseFloat(expr.Value, 64); err == nil {
return &Value{R: reflect.ValueOf(x)}, nil
}
// xxx imaginary literals
// xxx rune literals
if x, err := strconv.Unquote(expr.Value); err == nil {
return &Value{R: reflect.ValueOf(x)}, nil
}
// xxx err
}
func (s *Scope) evalCompositeLit(expr *ast.CompositeLit) (*refl.Value, error) {
typ, err := s.EvalType(expr.Type)
if err != nil {
return nil, err
}
switch typ.Kind() {
case StructKind:
return s.evalStructLit(typ, expr)
case ArrayKind:
return s.evalArrayLit(typ, expr)
case SliceKind:
return s.evalSliceLit(typ, expr)
case MapKind:
return s.evalMapLit(typ, expr)
}
// xxx err
}
func (s *Scope) evalStructLit(typ Type, expr *ast.CompositeLit) (*refl.Value, error) {
var (
expectKV bool
result = NewValue(typ)
)
for i, elt := range expr.Elts {
if elt, ok := elt.(*ast.KeyValueExpr); ok {
if i == 0 {
expectKV = true
} else if !expectKV {
// xxx err
}
key, ok := elt.Key.(*ast.Ident)
if !ok {
// xxx err
}
val, err := s.Eval1(elt.Value)
if err != nil {
return nil, err
}
tField, ok := typ.FieldByName(key.Name)
if !ok {
// xxx err
}
vField := result.FieldByIndex(tField.Index)
// xxx check val is assignable to vField's type
vField.Set(val)
} else {
if expectKV {
// xxx err
}
if i >= typ.NumField() {
// xxx err
}
val, err := s.Eval1(elt.Value)
if err != nil {
return nil, err
}
vField := result.FieldByIndex(i)
// xxx check val is assignable to vField's type
vField.Set(val)
}
}
return result, nil
}
func (s *Scope) evalArrayLit(typ Type, expr *ast.CompositeLit) (*refl.Value, error) {
// xxx
}
func (s *Scope) evalSliceLit(typ Type, expr *ast.CompositeLit) (*refl.Value, error) {
result := NewValue(typ)
for i, elt := range expr.Elts {
val, err := s.Eval1(elt)
if err != nil {
return nil, err
}
if !val.Type().AssignableTo(typ.Elem()) {
// xxx err
}
result = result.Append(val)
}
return result, nil
}
func (s *Scope) evalMapLit(typ Type, expr *ast.CompositeLit) (*refl.Value, error) {
result := NewValue(typ)
for i, elt := range expr.Elts {
elt, ok := elt.(*ast.KeyValueExpr)
if !ok {
// xxx err
}
kv, err := s.Eval1(elt.Key)
if err != nil {
return nil, err
}
if !kv.Type().AssignableTo(typ.Key()) {
// xxx err
}
vv, err := s.Eval1(elt.Value)
if err != nil {
return nil, err
}
if !vv.Type().AssignableTo(typ.Elem()) {
// xxx err
}
result.SetMapIndex(kv, vv)
}
return result, nil
}