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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// PACKAGE UNDER CONSTRUCTION. ANY AND ALL PARTS MAY CHANGE.
// The types package declares the types used to represent Go types.
//
package types
import "go/ast"
// All types implement the Type interface.
type Type interface {
isType()
}
// All concrete types embed ImplementsType which
// ensures that all types implement the Type interface.
type ImplementsType struct{}
func (t *ImplementsType) isType() {}
// A Basic represents a (unnamed) basic type.
type Basic struct {
ImplementsType
// TODO(gri) need a field specifying the exact basic type
}
// An Array represents an array type [Len]Elt.
type Array struct {
ImplementsType
Len uint64
Elt Type
}
// A Slice represents a slice type []Elt.
type Slice struct {
ImplementsType
Elt Type
}
// A Struct represents a struct type struct{...}.
type Struct struct {
ImplementsType
// TODO(gri) need to remember fields.
}
// A Pointer represents a pointer type *Base.
type Pointer struct {
ImplementsType
Base Type
}
// A Func represents a function type func(...) (...).
type Func struct {
ImplementsType
IsVariadic bool
// TODO(gri) need to remember parameters.
}
// An Interface represents an interface type interface{...}.
type Interface struct {
ImplementsType
// TODO(gri) need to remember methods.
}
// A Map represents a map type map[Key]Elt.
type Map struct {
ImplementsType
Key, Elt Type
}
// A Chan represents a channel type chan Elt, <-chan Elt, or chan<-Elt.
type Chan struct {
ImplementsType
Dir ast.ChanDir
Elt Type
}
// A Name represents a named type as declared in a type declaration.
type Name struct {
ImplementsType
Underlying Type // nil if not fully declared
Obj *ast.Object // corresponding declared object
// TODO(gri) need to remember fields and methods.
}
// If typ is a pointer type, Deref returns the pointer's base type;
// otherwise it returns typ.
func Deref(typ Type) Type {
if typ, ok := typ.(*Pointer); ok {
return typ.Base
}
return typ
}
// Underlying returns the underlying type of a type.
func Underlying(typ Type) Type {
if typ, ok := typ.(*Name); ok {
utyp := typ.Underlying
if _, ok := utyp.(*Basic); ok {
return typ
}
return utyp
}
return typ
}
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