func printMethods(printf printfFunc, node ast.Node, methods []*types.Selection) {
	if len(methods) > 0 {
		printf(node, "Method set:")
	}
	for _, meth := range methods {
		// Print the method type relative to the package
		// in which it was defined, not the query package,
		printf(meth.Obj(), "\t%s",
			types.SelectionString(meth, types.RelativeTo(meth.Obj().Pkg())))
	}
}

func methodsToSerial(this *types.Package, methods []*types.Selection, fset *token.FileSet) []serial.DescribeMethod {
	qualifier := types.RelativeTo(this)
	var jmethods []serial.DescribeMethod
	for _, meth := range methods {
		var ser serial.DescribeMethod
		if meth != nil { // may contain nils when called by implements (on a method)
			ser = serial.DescribeMethod{
				Name: types.SelectionString(meth, qualifier),
				Pos:  fset.Position(meth.Obj().Pos()).String(),
			}
		}
		jmethods = append(jmethods, ser)
	}
	return jmethods
}

func (r *describePackageResult) display(printf printfFunc) {
	printf(r.node, "%s", r.description)

	// Compute max width of name "column".
	maxname := 0
	for _, mem := range r.members {
		if l := len(mem.obj.Name()); l > maxname {
			maxname = l
		}
	}

	for _, mem := range r.members {
		printf(mem.obj, "\t%s", formatMember(mem.obj, maxname))
		for _, meth := range mem.methods {
			printf(meth.Obj(), "\t\t%s", types.SelectionString(meth, types.RelativeTo(r.pkg)))
		}
	}
}

// WritePackage writes to buf a human-readable summary of p.
func WritePackage(buf *bytes.Buffer, p *Package) {
	fmt.Fprintf(buf, "%s:\n", p)

	var names []string
	maxname := 0
	for name := range p.Members {
		if l := len(name); l > maxname {
			maxname = l
		}
		names = append(names, name)
	}

	from := p.Pkg
	sort.Strings(names)
	for _, name := range names {
		switch mem := p.Members[name].(type) {
		case *NamedConst:
			fmt.Fprintf(buf, "  const %-*s %s = %s\n",
				maxname, name, mem.Name(), mem.Value.RelString(from))

		case *Function:
			fmt.Fprintf(buf, "  func  %-*s %s\n",
				maxname, name, relType(mem.Type(), from))

		case *Type:
			fmt.Fprintf(buf, "  type  %-*s %s\n",
				maxname, name, relType(mem.Type().Underlying(), from))
			for _, meth := range typeutil.IntuitiveMethodSet(mem.Type(), &p.Prog.MethodSets) {
				fmt.Fprintf(buf, "    %s\n", types.SelectionString(meth, types.RelativeTo(from)))
			}

		case *Global:
			fmt.Fprintf(buf, "  var   %-*s %s\n",
				maxname, name, relType(mem.Type().(*types.Pointer).Elem(), from))
		}
	}

	fmt.Fprintf(buf, "\n")
}

// SelectionString prints selection sel relative to the query position.
func (qpos *queryPos) selectionString(sel *types.Selection) string {
	return types.SelectionString(sel, types.RelativeTo(qpos.info.Pkg))
}

func (a *analysis) namedType(obj *types.TypeName, implements map[*types.Named]implementsFacts) {
	qualifier := types.RelativeTo(obj.Pkg())
	T := obj.Type().(*types.Named)
	v := &TypeInfoJSON{
		Name:    obj.Name(),
		Size:    sizes.Sizeof(T),
		Align:   sizes.Alignof(T),
		Methods: []anchorJSON{}, // (JS wants non-nil)
	}

	// addFact adds the fact "is implemented by T" (by) or
	// "implements T" (!by) to group.
	addFact := func(group *implGroupJSON, T types.Type, by bool) {
		Tobj := deref(T).(*types.Named).Obj()
		var byKind string
		if by {
			// Show underlying kind of implementing type,
			// e.g. "slice", "array", "struct".
			s := reflect.TypeOf(T.Underlying()).String()
			byKind = strings.ToLower(strings.TrimPrefix(s, "*types."))
		}
		group.Facts = append(group.Facts, implFactJSON{
			ByKind: byKind,
			Other: anchorJSON{
				Href: a.posURL(Tobj.Pos(), len(Tobj.Name())),
				Text: types.TypeString(T, qualifier),
			},
		})
	}

	// IMPLEMENTS
	if r, ok := implements[T]; ok {
		if isInterface(T) {
			// "T is implemented by <conc>" ...
			// "T is implemented by <iface>"...
			// "T implements        <iface>"...
			group := implGroupJSON{
				Descr: types.TypeString(T, qualifier),
			}
			// Show concrete types first; use two passes.
			for _, sub := range r.to {
				if !isInterface(sub) {
					addFact(&group, sub, true)
				}
			}
			for _, sub := range r.to {
				if isInterface(sub) {
					addFact(&group, sub, true)
				}
			}
			for _, super := range r.from {
				addFact(&group, super, false)
			}
			v.ImplGroups = append(v.ImplGroups, group)
		} else {
			// T is concrete.
			if r.from != nil {
				// "T implements <iface>"...
				group := implGroupJSON{
					Descr: types.TypeString(T, qualifier),
				}
				for _, super := range r.from {
					addFact(&group, super, false)
				}
				v.ImplGroups = append(v.ImplGroups, group)
			}
			if r.fromPtr != nil {
				// "*C implements <iface>"...
				group := implGroupJSON{
					Descr: "*" + types.TypeString(T, qualifier),
				}
				for _, psuper := range r.fromPtr {
					addFact(&group, psuper, false)
				}
				v.ImplGroups = append(v.ImplGroups, group)
			}
		}
	}

	// METHOD SETS
	for _, sel := range typeutil.IntuitiveMethodSet(T, &a.prog.MethodSets) {
		meth := sel.Obj().(*types.Func)
		pos := meth.Pos() // may be 0 for error.Error
		v.Methods = append(v.Methods, anchorJSON{
			Href: a.posURL(pos, len(meth.Name())),
			Text: types.SelectionString(sel, qualifier),
		})
	}

	// Since there can be many specs per decl, we
	// can't attach the link to the keyword 'type'
	// (as we do with 'func'); we use the Ident.
	fi, offset := a.fileAndOffset(obj.Pos())
	fi.addLink(aLink{
		start:   offset,
		end:     offset + len(obj.Name()),
		title:   fmt.Sprintf("type info for %s", obj.Name()),
		onclick: fmt.Sprintf("onClickTypeInfo(%d)", fi.addData(v)),
	})

//.........这里部分代码省略.........