-
Notifications
You must be signed in to change notification settings - Fork 6
/
plus.go
90 lines (75 loc) · 2.12 KB
/
plus.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
package ast
import (
"fmt"
"github.com/NicoNex/tau/internal/code"
"github.com/NicoNex/tau/internal/compiler"
"github.com/NicoNex/tau/internal/obj"
)
type Plus struct {
l Node
r Node
pos int
}
func NewPlus(l, r Node, pos int) Node {
return Plus{
l: l,
r: r,
pos: pos,
}
}
func (p Plus) Eval() (obj.Object, error) {
left, err := p.l.Eval()
if err != nil {
return obj.NullObj, err
}
right, err := p.r.Eval()
if err != nil {
return obj.NullObj, err
}
if !obj.AssertTypes(left, obj.IntType, obj.FloatType, obj.StringType) {
return obj.NullObj, fmt.Errorf("unsupported operator '+' for type %v", left.Type())
}
if !obj.AssertTypes(right, obj.IntType, obj.FloatType, obj.StringType) {
return obj.NullObj, fmt.Errorf("unsupported operator '+' for type %v", right.Type())
}
switch {
case obj.AssertTypes(left, obj.StringType) && obj.AssertTypes(right, obj.StringType):
return obj.NewString(left.String() + right.String()), nil
case obj.AssertTypes(left, obj.IntType) && obj.AssertTypes(right, obj.IntType):
return obj.NewInteger(int64(left.(obj.Integer)) + int64(right.(obj.Integer))), nil
case obj.AssertTypes(left, obj.FloatType, obj.IntType) && obj.AssertTypes(right, obj.FloatType, obj.IntType):
l, r := obj.ToFloat(left, right)
return obj.NewFloat(float64(l.(obj.Float)) + float64(r.(obj.Float))), nil
default:
return obj.NullObj, fmt.Errorf(
"invalid operation %v + %v (wrong types %v and %v)",
left, right, left.Type(), right.Type(),
)
}
}
func (p Plus) String() string {
return fmt.Sprintf("(%v + %v)", p.l, p.r)
}
func (p Plus) Compile(c *compiler.Compiler) (position int, err error) {
if p.IsConstExpression() {
o, err := p.Eval()
if err != nil {
return 0, c.NewError(p.pos, err.Error())
}
position = c.Emit(code.OpConstant, c.AddConstant(o))
c.Bookmark(p.pos)
return position, err
}
if position, err = p.l.Compile(c); err != nil {
return
}
if position, err = p.r.Compile(c); err != nil {
return
}
position = c.Emit(code.OpAdd)
c.Bookmark(p.pos)
return
}
func (p Plus) IsConstExpression() bool {
return p.l.IsConstExpression() && p.r.IsConstExpression()
}