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package typeutil
import (
"bytes"
"go/types"
"sync"
)
var bufferPool = &sync.Pool{
New: func() interface{} {
buf := bytes.NewBuffer(nil)
buf.Grow(64)
return buf
},
}
func FuncName(f *types.Func) string {
buf := bufferPool.Get().(*bytes.Buffer)
buf.Reset()
if f.Type() != nil {
sig := f.Type().(*types.Signature)
if recv := sig.Recv(); recv != nil {
buf.WriteByte('(')
if _, ok := recv.Type().(*types.Interface); ok {
// gcimporter creates abstract methods of
// named interfaces using the interface type
// (not the named type) as the receiver.
// Don't print it in full.
buf.WriteString("interface")
} else {
types.WriteType(buf, recv.Type(), nil)
}
buf.WriteByte(')')
buf.WriteByte('.')
} else if f.Pkg() != nil {
writePackage(buf, f.Pkg())
}
}
buf.WriteString(f.Name())
s := buf.String()
bufferPool.Put(buf)
return s
}
func writePackage(buf *bytes.Buffer, pkg *types.Package) {
if pkg == nil {
return
}
s := pkg.Path()
if s != "" {
buf.WriteString(s)
buf.WriteByte('.')
}
}
// Dereference returns a pointer's element type; otherwise it returns
// T.
func Dereference(T types.Type) types.Type {
if p, ok := T.Underlying().(*types.Pointer); ok {
return p.Elem()
}
return T
}
// DereferenceR returns a pointer's element type; otherwise it returns
// T. If the element type is itself a pointer, DereferenceR will be
// applied recursively.
func DereferenceR(T types.Type) types.Type {
if p, ok := T.Underlying().(*types.Pointer); ok {
return DereferenceR(p.Elem())
}
return T
}
func IsObject(obj types.Object, name string) bool {
var path string
if pkg := obj.Pkg(); pkg != nil {
path = pkg.Path() + "."
}
return path+obj.Name() == name
}
// OPT(dh): IsType is kind of expensive; should we really use it?
func IsType(T types.Type, name string) bool { return types.TypeString(T, nil) == name }
func IsPointerLike(T types.Type) bool {
switch T := T.Underlying().(type) {
case *types.Interface, *types.Chan, *types.Map, *types.Signature, *types.Pointer, *types.Slice:
return true
case *types.Basic:
return T.Kind() == types.UnsafePointer
}
return false
}
type Field struct {
Var *types.Var
Tag string
Path []int
}
// FlattenFields recursively flattens T and embedded structs,
// returning a list of fields. If multiple fields with the same name
// exist, all will be returned.
func FlattenFields(T *types.Struct) []Field {
return flattenFields(T, nil, nil)
}
func flattenFields(T *types.Struct, path []int, seen map[types.Type]bool) []Field {
if seen == nil {
seen = map[types.Type]bool{}
}
if seen[T] {
return nil
}
seen[T] = true
var out []Field
for i := 0; i < T.NumFields(); i++ {
field := T.Field(i)
tag := T.Tag(i)
np := append(path[:len(path):len(path)], i)
if field.Anonymous() {
if s, ok := Dereference(field.Type()).Underlying().(*types.Struct); ok {
out = append(out, flattenFields(s, np, seen)...)
}
} else {
out = append(out, Field{field, tag, np})
}
}
return out
}
|
