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
|
package objects
import (
"github.com/d5/tengo/compiler/token"
)
// Char represents a character value.
type Char struct {
Value rune
}
func (o *Char) String() string {
return string(o.Value)
}
// TypeName returns the name of the type.
func (o *Char) TypeName() string {
return "char"
}
// BinaryOp returns another object that is the result of
// a given binary operator and a right-hand side object.
func (o *Char) BinaryOp(op token.Token, rhs Object) (Object, error) {
switch rhs := rhs.(type) {
case *Char:
switch op {
case token.Add:
r := o.Value + rhs.Value
if r == o.Value {
return o, nil
}
return &Char{Value: r}, nil
case token.Sub:
r := o.Value - rhs.Value
if r == o.Value {
return o, nil
}
return &Char{Value: r}, nil
case token.Less:
if o.Value < rhs.Value {
return TrueValue, nil
}
return FalseValue, nil
case token.Greater:
if o.Value > rhs.Value {
return TrueValue, nil
}
return FalseValue, nil
case token.LessEq:
if o.Value <= rhs.Value {
return TrueValue, nil
}
return FalseValue, nil
case token.GreaterEq:
if o.Value >= rhs.Value {
return TrueValue, nil
}
return FalseValue, nil
}
case *Int:
switch op {
case token.Add:
r := o.Value + rune(rhs.Value)
if r == o.Value {
return o, nil
}
return &Char{Value: r}, nil
case token.Sub:
r := o.Value - rune(rhs.Value)
if r == o.Value {
return o, nil
}
return &Char{Value: r}, nil
case token.Less:
if int64(o.Value) < rhs.Value {
return TrueValue, nil
}
return FalseValue, nil
case token.Greater:
if int64(o.Value) > rhs.Value {
return TrueValue, nil
}
return FalseValue, nil
case token.LessEq:
if int64(o.Value) <= rhs.Value {
return TrueValue, nil
}
return FalseValue, nil
case token.GreaterEq:
if int64(o.Value) >= rhs.Value {
return TrueValue, nil
}
return FalseValue, nil
}
}
return nil, ErrInvalidOperator
}
// Copy returns a copy of the type.
func (o *Char) Copy() Object {
return &Char{Value: o.Value}
}
// IsFalsy returns true if the value of the type is falsy.
func (o *Char) IsFalsy() bool {
return o.Value == 0
}
// Equals returns true if the value of the type
// is equal to the value of another object.
func (o *Char) Equals(x Object) bool {
t, ok := x.(*Char)
if !ok {
return false
}
return o.Value == t.Value
}
|
