eval/walk.go at master · 0xfaded/eval · GitHub

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
package eval

import (
	"go/ast"
)

type exprVisitor interface {
	visit(expr Expr) bool
}

func walk(expr ast.Expr, visitor exprVisitor) {
	if expr == nil {
		return
	}
	switch expr := expr.(type) {
	case *BadExpr:
		visitor.visit(expr)
	case *Ident:
		visitor.visit(expr)
	case *Ellipsis:
		visitor.visit(expr)
	case *BasicLit:
		visitor.visit(expr)
	case *FuncLit:
		visitor.visit(expr)
	case *CompositeLit:
		if visitor.visit(expr) {
			for _, elt := range expr.Elts {
				walk(elt, visitor)
			}
		}
	case *ParenExpr:
		if visitor.visit(expr) {
			walk(expr.X, visitor)
		}
	case *SelectorExpr:
		if visitor.visit(expr) {
			walk(expr.X, visitor)
		}
	case *IndexExpr:
		if visitor.visit(expr) {
			walk(expr.Index, visitor)
			walk(expr.X, visitor)
		}
	case *SliceExpr:
		if visitor.visit(expr) {
			walk(expr.Low, visitor)
			walk(expr.High, visitor)
			// TODO[crc] go 1.2 introduces the [::] notation. Add after upgrade
			// walk(expr.Max, visitor)
		}
	case *TypeAssertExpr:
		if visitor.visit(expr) {
			walk(expr.X, visitor)
		}
	case *CallExpr:
		if visitor.visit(expr) {
			for _, arg := range expr.Args {
				walk(arg, visitor)
			}
		}
	case *StarExpr:
		if visitor.visit(expr) {
			walk(expr.X, visitor)
		}
	case *UnaryExpr:
		if visitor.visit(expr) {
			walk(expr.X, visitor)
		}
	case *BinaryExpr:
		if visitor.visit(expr) {
			walk(expr.X, visitor)
			walk(expr.Y, visitor)
		}
	case *KeyValueExpr:
		if visitor.visit(expr) {
			walk(expr.Key, visitor)
			walk(expr.Value, visitor)
		}
	}
}