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https://github.com/golang/go
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[dev.typeparams] go/types: move Interface type decl into interface.go (cleanup)
This is a port of CL 332092 to go/types. Change-Id: I9971c49570424368575108832eac0cd978eb3fe6 Reviewed-on: https://go-review.googlesource.com/c/go/+/335039 Trust: Robert Findley <rfindley@google.com> Run-TryBot: Robert Findley <rfindley@google.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Robert Griesemer <gri@golang.org>
This commit is contained in:
Rob Findley
Robert Findley
parent
e12d43866d
commit
624d152db7
@ -10,6 +10,166 @@ import (
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"go/token"
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)
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// ----------------------------------------------------------------------------
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// API
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// An Interface represents an interface type.
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type Interface struct {
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obj *TypeName // type name object defining this interface; or nil (for better error messages)
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methods []*Func // ordered list of explicitly declared methods
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embeddeds []Type // ordered list of explicitly embedded elements
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embedPos *[]token.Pos // positions of embedded elements; or nil (for error messages) - use pointer to save space
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complete bool // indicates that obj, methods, and embeddeds are set and type set can be computed
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tset *TypeSet // type set described by this interface, computed lazily
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}
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// typeSet returns the type set for interface t.
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func (t *Interface) typeSet() *TypeSet { return computeTypeSet(nil, token.NoPos, t) }
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// is reports whether interface t represents types that all satisfy f.
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func (t *Interface) is(f func(Type, bool) bool) bool {
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switch t := t.typeSet().types.(type) {
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case nil, *top:
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// TODO(gri) should settle on top or nil to represent this case
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return false // we must have at least one type! (was bug)
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case *Union:
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return t.is(func(typ Type, tilde bool) bool { return f(typ, tilde) })
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default:
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return f(t, false)
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}
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}
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// emptyInterface represents the empty (completed) interface
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var emptyInterface = Interface{complete: true, tset: &topTypeSet}
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// NewInterface returns a new interface for the given methods and embedded types.
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// NewInterface takes ownership of the provided methods and may modify their types
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// by setting missing receivers.
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//
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// Deprecated: Use NewInterfaceType instead which allows arbitrary embedded types.
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func NewInterface(methods []*Func, embeddeds []*Named) *Interface {
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tnames := make([]Type, len(embeddeds))
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for i, t := range embeddeds {
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tnames[i] = t
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}
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return NewInterfaceType(methods, tnames)
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}
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// NewInterfaceType returns a new interface for the given methods and embedded types.
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// NewInterfaceType takes ownership of the provided methods and may modify their types
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// by setting missing receivers.
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func NewInterfaceType(methods []*Func, embeddeds []Type) *Interface {
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if len(methods) == 0 && len(embeddeds) == 0 {
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return &emptyInterface
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}
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// set method receivers if necessary
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typ := new(Interface)
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for _, m := range methods {
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if sig := m.typ.(*Signature); sig.recv == nil {
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sig.recv = NewVar(m.pos, m.pkg, "", typ)
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}
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}
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// TODO(rfindley): this guard is not present in types2. Remove it?
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// All embedded types should be interfaces; however, defined types
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// may not yet be fully resolved. Only verify that non-defined types
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// are interfaces. This matches the behavior of the code before the
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// fix for #25301 (issue #25596).
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for _, t := range embeddeds {
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if _, ok := t.(*Named); !ok && !IsInterface(t) {
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panic("embedded type is not an interface")
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}
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}
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// sort for API stability
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sortMethods(methods)
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typ.methods = methods
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typ.embeddeds = embeddeds
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typ.complete = true
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return typ
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}
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// NumExplicitMethods returns the number of explicitly declared methods of interface t.
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func (t *Interface) NumExplicitMethods() int { return len(t.methods) }
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// ExplicitMethod returns the i'th explicitly declared method of interface t for 0 <= i < t.NumExplicitMethods().
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// The methods are ordered by their unique Id.
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func (t *Interface) ExplicitMethod(i int) *Func { return t.methods[i] }
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// NumEmbeddeds returns the number of embedded types in interface t.
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func (t *Interface) NumEmbeddeds() int { return len(t.embeddeds) }
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// Embedded returns the i'th embedded defined (*Named) type of interface t for 0 <= i < t.NumEmbeddeds().
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// The result is nil if the i'th embedded type is not a defined type.
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//
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// Deprecated: Use EmbeddedType which is not restricted to defined (*Named) types.
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func (t *Interface) Embedded(i int) *Named { tname, _ := t.embeddeds[i].(*Named); return tname }
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// EmbeddedType returns the i'th embedded type of interface t for 0 <= i < t.NumEmbeddeds().
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func (t *Interface) EmbeddedType(i int) Type { return t.embeddeds[i] }
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// NumMethods returns the total number of methods of interface t.
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func (t *Interface) NumMethods() int { return t.typeSet().NumMethods() }
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// Method returns the i'th method of interface t for 0 <= i < t.NumMethods().
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// The methods are ordered by their unique Id.
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func (t *Interface) Method(i int) *Func { return t.typeSet().Method(i) }
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// Empty reports whether t is the empty interface.
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func (t *Interface) Empty() bool { return t.typeSet().IsTop() }
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// IsComparable reports whether interface t is or embeds the predeclared interface "comparable".
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func (t *Interface) IsComparable() bool { return t.typeSet().IsComparable() }
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// IsConstraint reports whether interface t is not just a method set.
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func (t *Interface) IsConstraint() bool { return !t.typeSet().IsMethodSet() }
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// isSatisfiedBy reports whether interface t's type list is satisfied by the type typ.
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// If the type list is empty (absent), typ trivially satisfies the interface.
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// TODO(gri) This is not a great name. Eventually, we should have a more comprehensive
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// "implements" predicate.
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func (t *Interface) isSatisfiedBy(typ Type) bool {
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t.Complete()
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switch t := t.typeSet().types.(type) {
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case nil:
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return true // no type restrictions
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case *Union:
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r, _ := t.intersect(typ, false)
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return r != nil
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default:
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return Identical(t, typ)
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}
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}
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// Complete computes the interface's type set. It must be called by users of
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// NewInterfaceType and NewInterface after the interface's embedded types are
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// fully defined and before using the interface type in any way other than to
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// form other types. The interface must not contain duplicate methods or a
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// panic occurs. Complete returns the receiver.
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//
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// Deprecated: Type sets are now computed lazily, on demand; this function
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// is only here for backward-compatibility. It does not have to
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// be called explicitly anymore.
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func (t *Interface) Complete() *Interface {
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// Some tests are still depending on the state change
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// (string representation of an Interface not containing an
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// /* incomplete */ marker) caused by the explicit Complete
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// call, so we compute the type set eagerly here.
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t.complete = true
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t.typeSet()
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return t
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}
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func (t *Interface) Underlying() Type { return t }
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func (t *Interface) String() string { return TypeString(t, nil) }
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// ----------------------------------------------------------------------------
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// Implementation
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func (check *Checker) interfaceType(ityp *Interface, iface *ast.InterfaceType, def *Named) {
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var tlist []ast.Expr
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var tname *ast.Ident // "type" name of first entry in a type list declaration
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@ -163,156 +163,6 @@ func (t *Tuple) Len() int {
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// At returns the i'th variable of tuple t.
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func (t *Tuple) At(i int) *Var { return t.vars[i] }
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// An Interface represents an interface type.
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type Interface struct {
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obj *TypeName // type name object defining this interface; or nil (for better error messages)
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methods []*Func // ordered list of explicitly declared methods
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embeddeds []Type // ordered list of explicitly embedded elements
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embedPos *[]token.Pos // positions of embedded elements; or nil (for error messages) - use pointer to save space
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complete bool // indicates that obj, methods, and embeddeds are set and type set can be computed
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tset *TypeSet // type set described by this interface, computed lazily
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}
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// typeSet returns the type set for interface t.
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func (t *Interface) typeSet() *TypeSet { return computeTypeSet(nil, token.NoPos, t) }
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// is reports whether interface t represents types that all satisfy f.
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func (t *Interface) is(f func(Type, bool) bool) bool {
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switch t := t.typeSet().types.(type) {
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case nil, *top:
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// TODO(gri) should settle on top or nil to represent this case
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return false // we must have at least one type! (was bug)
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case *Union:
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return t.is(func(typ Type, tilde bool) bool { return f(typ, tilde) })
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default:
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return f(t, false)
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}
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}
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// emptyInterface represents the empty (completed) interface
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var emptyInterface = Interface{complete: true, tset: &topTypeSet}
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// NewInterface returns a new interface for the given methods and embedded types.
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// NewInterface takes ownership of the provided methods and may modify their types
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// by setting missing receivers.
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//
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// Deprecated: Use NewInterfaceType instead which allows arbitrary embedded types.
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func NewInterface(methods []*Func, embeddeds []*Named) *Interface {
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tnames := make([]Type, len(embeddeds))
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for i, t := range embeddeds {
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tnames[i] = t
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}
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return NewInterfaceType(methods, tnames)
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}
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// NewInterfaceType returns a new interface for the given methods and embedded types.
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// NewInterfaceType takes ownership of the provided methods and may modify their types
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// by setting missing receivers.
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func NewInterfaceType(methods []*Func, embeddeds []Type) *Interface {
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if len(methods) == 0 && len(embeddeds) == 0 {
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return &emptyInterface
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}
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// set method receivers if necessary
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typ := new(Interface)
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for _, m := range methods {
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if sig := m.typ.(*Signature); sig.recv == nil {
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sig.recv = NewVar(m.pos, m.pkg, "", typ)
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}
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}
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// All embedded types should be interfaces; however, defined types
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// may not yet be fully resolved. Only verify that non-defined types
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// are interfaces. This matches the behavior of the code before the
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// fix for #25301 (issue #25596).
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for _, t := range embeddeds {
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if _, ok := t.(*Named); !ok && !IsInterface(t) {
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panic("embedded type is not an interface")
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}
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}
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// sort for API stability
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sortMethods(methods)
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typ.methods = methods
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typ.embeddeds = embeddeds
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typ.complete = true
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return typ
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}
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// NumExplicitMethods returns the number of explicitly declared methods of interface t.
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func (t *Interface) NumExplicitMethods() int { return len(t.methods) }
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// ExplicitMethod returns the i'th explicitly declared method of interface t for 0 <= i < t.NumExplicitMethods().
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// The methods are ordered by their unique Id.
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func (t *Interface) ExplicitMethod(i int) *Func { return t.methods[i] }
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// NumEmbeddeds returns the number of embedded types in interface t.
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func (t *Interface) NumEmbeddeds() int { return len(t.embeddeds) }
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// Embedded returns the i'th embedded defined (*Named) type of interface t for 0 <= i < t.NumEmbeddeds().
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// The result is nil if the i'th embedded type is not a defined type.
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//
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// Deprecated: Use EmbeddedType which is not restricted to defined (*Named) types.
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func (t *Interface) Embedded(i int) *Named { tname, _ := t.embeddeds[i].(*Named); return tname }
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// EmbeddedType returns the i'th embedded type of interface t for 0 <= i < t.NumEmbeddeds().
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func (t *Interface) EmbeddedType(i int) Type { return t.embeddeds[i] }
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// NumMethods returns the total number of methods of interface t.
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func (t *Interface) NumMethods() int { return t.typeSet().NumMethods() }
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// Method returns the i'th method of interface t for 0 <= i < t.NumMethods().
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// The methods are ordered by their unique Id.
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func (t *Interface) Method(i int) *Func { return t.typeSet().Method(i) }
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// Empty reports whether t is the empty interface.
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func (t *Interface) Empty() bool { return t.typeSet().IsTop() }
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// IsComparable reports whether interface t is or embeds the predeclared interface "comparable".
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func (t *Interface) IsComparable() bool { return t.typeSet().IsComparable() }
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// IsConstraint reports whether interface t is not just a method set.
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func (t *Interface) IsConstraint() bool { return !t.typeSet().IsMethodSet() }
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// isSatisfiedBy reports whether interface t's type list is satisfied by the type typ.
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// If the type list is empty (absent), typ trivially satisfies the interface.
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// TODO(gri) This is not a great name. Eventually, we should have a more comprehensive
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// "implements" predicate.
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func (t *Interface) isSatisfiedBy(typ Type) bool {
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t.Complete()
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switch t := t.typeSet().types.(type) {
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case nil:
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return true // no type restrictions
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case *Union:
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r, _ := t.intersect(typ, false)
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return r != nil
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default:
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return Identical(t, typ)
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}
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}
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// Complete computes the interface's type set. It must be called by users of
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// NewInterfaceType and NewInterface after the interface's embedded types are
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// fully defined and before using the interface type in any way other than to
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// form other types. The interface must not contain duplicate methods or a
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// panic occurs. Complete returns the receiver.
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//
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// Deprecated: Type sets are now computed lazily, on demand; this function
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// is only here for backward-compatibility. It does not have to
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// be called explicitly anymore.
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func (t *Interface) Complete() *Interface {
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// Some tests are still depending on the state change
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// (string representation of an Interface not containing an
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// /* incomplete */ marker) caused by the explicit Complete
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// call, so we compute the type set eagerly here.
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t.complete = true
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t.typeSet()
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return t
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}
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// A Map represents a map type.
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type Map struct {
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key, elem Type
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@ -638,7 +488,6 @@ func (t *Array) Underlying() Type { return t }
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func (t *Slice) Underlying() Type { return t }
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func (t *Pointer) Underlying() Type { return t }
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func (t *Tuple) Underlying() Type { return t }
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func (t *Interface) Underlying() Type { return t }
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func (t *Map) Underlying() Type { return t }
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func (t *Chan) Underlying() Type { return t }
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func (t *Named) Underlying() Type { return t.expand().underlying }
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@ -652,7 +501,6 @@ func (t *Array) String() string { return TypeString(t, nil) }
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func (t *Slice) String() string { return TypeString(t, nil) }
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func (t *Pointer) String() string { return TypeString(t, nil) }
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func (t *Tuple) String() string { return TypeString(t, nil) }
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func (t *Interface) String() string { return TypeString(t, nil) }
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func (t *Map) String() string { return TypeString(t, nil) }
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func (t *Chan) String() string { return TypeString(t, nil) }
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func (t *Named) String() string { return TypeString(t, nil) }
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