pkg/gen/gen.go - cue - Git at Google

 // Copyright 2018 The CUE Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.

 // Package gen is a command that can be used to bootstrap a new builtin package
 // directory. The directory has to reside in cuelang.org/go/pkg.
 //
 // To bootstrap a directory, run this command from within that direcory.
 // After that directory's files can be regenerated with go generate.
 //
 // Be sure to also update an entry in pkg/pkg.go, if so desired.
 package main

 import (
 	"bytes"
 	"flag"
 	"fmt"
 	"go/ast"
 	"go/constant"
 	"go/format"
 	"go/parser"
 	"go/printer"
 	"go/token"
 	"io"
 	"io/ioutil"
 	"log"
 	"math/big"
 	"os"
 	"path"
 	"path/filepath"
 	"strings"

 	"cuelang.org/go/cue"
 	"cuelang.org/go/cue/errors"
 	cueformat "cuelang.org/go/cue/format"
 	"cuelang.org/go/cue/load"
 	"cuelang.org/go/internal"
 )

 const genFile = "pkg.go"

 const prefix = "../pkg/"

 const header = `// Code generated by go generate. DO NOT EDIT.

  //go:generate rm %s
  //go:generate go run %sgen/gen.go

 package %s

 import (
 	"cuelang.org/go/internal/core/adt"
 	"cuelang.org/go/pkg/internal"
 )

 func init() {
 	internal.Register(%q, pkg)
 }

 var _ = adt.TopKind // in case the adt package isn't used

 `

 func main() {
 	flag.Parse()
 	log.SetFlags(log.Lshortfile)
 	log.SetOutput(os.Stdout)

 	g := generator{
 		w:     &bytes.Buffer{},
 		decls: &bytes.Buffer{},
 		fset:  token.NewFileSet(),
 	}

 	cwd, _ := os.Getwd()
 	pkg := strings.Split(filepath.ToSlash(cwd), "/pkg/")[1]
 	gopkg := path.Base(pkg)
 	// TODO: rename list to lists and struct to structs.
 	if gopkg == "struct" {
 		gopkg = "structs"
 	}
 	dots := strings.Repeat("../", strings.Count(pkg, "/")+1)

 	w := &bytes.Buffer{}
 	fmt.Fprintf(w, header, genFile, dots, gopkg, pkg)
 	g.processDir(pkg)

 	io.Copy(w, g.decls)
 	io.Copy(w, g.w)

 	b, err := format.Source(w.Bytes())
 	if err != nil {
 		b = w.Bytes() // write the unformatted source
 	}

 	b = bytes.Replace(b, []byte(".Builtin{{}}"), []byte(".Builtin{}"), -1)

 	filename := filepath.Join(genFile)

 	if err := ioutil.WriteFile(filename, b, 0644); err != nil {
 		log.Fatal(err)
 	}
 }

 type generator struct {
 	w          *bytes.Buffer
 	decls      *bytes.Buffer
 	name       string
 	fset       *token.FileSet
 	defaultPkg string
 	first      bool
 	iota       int

 	imports []*ast.ImportSpec
 }

 func (g *generator) processDir(pkg string) {
 	goFiles, err := filepath.Glob("*.go")
 	if err != nil {
 		log.Fatal(err)
 	}

 	cueFiles, err := filepath.Glob("*.cue")
 	if err != nil {
 		log.Fatal(err)
 	}

 	if len(goFiles)+len(cueFiles) == 0 {
 		return
 	}

 	fmt.Fprintf(g.w, "var pkg = &internal.Package{\nNative: []*internal.Builtin{{\n")
 	g.first = true
 	for _, filename := range goFiles {
 		if filename == genFile {
 			continue
 		}
 		g.processGo(filename)
 	}
 	fmt.Fprintf(g.w, "}},\n")
 	g.processCUE(pkg)
 	fmt.Fprintf(g.w, "}\n")
 }

 func (g *generator) sep() {
 	if g.first {
 		g.first = false
 		return
 	}
 	fmt.Fprintln(g.w, "}, {")
 }

 // processCUE mixes in CUE definitions defined in the package directory.
 func (g *generator) processCUE(pkg string) {
 	instances := cue.Build(load.Instances([]string{"."}, &load.Config{
 		StdRoot: ".",
 	}))

 	if err := instances[0].Err; err != nil {
 		if !strings.Contains(err.Error(), "no CUE files") {
 			errors.Print(os.Stderr, err, nil)
 			log.Fatalf("error processing %s: %v", pkg, err)
 		}
 		return
 	}

 	v := instances[0].Value().Syntax(cue.Raw())
 	// fmt.Printf("%T\n", v)
 	// fmt.Println(internal.DebugStr(v))
 	n := internal.ToExpr(v)
 	b, err := cueformat.Node(n)
 	if err != nil {
 		log.Fatal(err)
 	}
 	b = bytes.ReplaceAll(b, []byte("\n\n"), []byte("\n"))
 	// body = strings.ReplaceAll(body, "\t", "")
 	// TODO: escape backtick
 	fmt.Fprintf(g.w, "CUE: `%s`,\n", string(b))
 }

 func (g *generator) processGo(filename string) {
 	if strings.HasSuffix(filename, "_test.go") {
 		return
 	}
 	f, err := parser.ParseFile(g.fset, filename, nil, parser.ParseComments)
 	if err != nil {
 		log.Fatal(err)
 	}
 	g.defaultPkg = ""
 	g.name = f.Name.Name
 	if g.name == "structs" {
 		g.name = "struct"
 	}

 	for _, d := range f.Decls {
 		switch x := d.(type) {
 		case *ast.GenDecl:
 			switch x.Tok {
 			case token.CONST:
 				for _, spec := range x.Specs {
 					if !ast.IsExported(spec.(*ast.ValueSpec).Names[0].Name) {
 						continue
 					}
 					g.genConst(spec.(*ast.ValueSpec))
 				}
 			case token.VAR:
 				continue
 			case token.TYPE:
 				// TODO: support type declarations.
 				continue
 			case token.IMPORT:
 				continue
 			default:
 				log.Fatalf("gen %s: unexpected spec of type %s", filename, x.Tok)
 			}
 		case *ast.FuncDecl:
 			g.genFun(x)
 		}
 	}
 }

 func (g *generator) genConst(spec *ast.ValueSpec) {
 	name := spec.Names[0].Name
 	value := ""
 	switch v := g.toValue(spec.Values[0]); v.Kind() {
 	case constant.Bool, constant.Int, constant.String:
 		// TODO: convert octal numbers
 		value = v.ExactString()
 	case constant.Float:
 		var rat big.Rat
 		rat.SetString(v.ExactString())
 		var float big.Float
 		float.SetRat(&rat)
 		value = float.Text('g', -1)
 	default:
 		fmt.Printf("Dropped entry %s.%s (%T: %v)\n", g.defaultPkg, name, v.Kind(), v.ExactString())
 		return
 	}
 	g.sep()
 	fmt.Fprintf(g.w, "Name: %q,\n Const: %q,\n", name, value)
 }

 func (g *generator) toValue(x ast.Expr) constant.Value {
 	switch x := x.(type) {
 	case *ast.BasicLit:
 		return constant.MakeFromLiteral(x.Value, x.Kind, 0)
 	case *ast.BinaryExpr:
 		return constant.BinaryOp(g.toValue(x.X), x.Op, g.toValue(x.Y))
 	case *ast.UnaryExpr:
 		return constant.UnaryOp(x.Op, g.toValue(x.X), 0)
 	default:
 		log.Fatalf("%s: unsupported expression type %T: %#v", g.defaultPkg, x, x)
 	}
 	return constant.MakeUnknown()
 }

 func (g *generator) genFun(x *ast.FuncDecl) {
 	if x.Body == nil || !ast.IsExported(x.Name.Name) {
 		return
 	}
 	types := []string{}
 	if x.Type.Results != nil {
 		for _, f := range x.Type.Results.List {
 			if len(f.Names) > 0 {
 				for range f.Names {
 					types = append(types, g.goKind(f.Type))
 				}
 			} else {
 				types = append(types, g.goKind(f.Type))
 			}
 		}
 	}
 	if n := len(types); n != 1 && (n != 2 || types[1] != "error") {
 		fmt.Printf("Dropped func %s.%s: must have one return value or a value and an error %v\n", g.defaultPkg, x.Name.Name, types)
 		return
 	}

 	if x.Recv != nil {
 		// if strings.HasPrefix(x.Name.Name, g.name) {
 		// 	printer.Fprint(g.decls, g.fset, x)
 		// 	fmt.Fprint(g.decls, "\n\n")
 		// }
 		return
 	}

 	g.sep()
 	fmt.Fprintf(g.w, "Name: %q,\n", x.Name.Name)

 	args := []string{}
 	vals := []string{}
 	kind := []string{}
 	for _, f := range x.Type.Params.List {
 		for _, name := range f.Names {
 			typ := strings.Title(g.goKind(f.Type))
 			argKind := g.goToCUE(f.Type)
 			vals = append(vals, fmt.Sprintf("c.%s(%d)", typ, len(args)))
 			args = append(args, name.Name)
 			kind = append(kind, argKind)
 		}
 	}

 	fmt.Fprintf(g.w, "Params: []internal.Param{\n")
 	for _, k := range kind {
 		fmt.Fprintf(g.w, "{Kind: %s},\n", k)
 	}
 	fmt.Fprintf(g.w, "\n},\n")

 	expr := x.Type.Results.List[0].Type
 	fmt.Fprintf(g.w, "Result: %s,\n", g.goToCUE(expr))

 	argList := strings.Join(args, ", ")
 	valList := strings.Join(vals, ", ")
 	init := ""
 	if len(args) > 0 {
 		init = fmt.Sprintf("%s := %s", argList, valList)
 	}

 	fmt.Fprintf(g.w, "Func: func(c *internal.CallCtxt) {")
 	defer fmt.Fprintln(g.w, "},")
 	fmt.Fprintln(g.w)
 	if init != "" {
 		fmt.Fprintln(g.w, init)
 	}
 	fmt.Fprintln(g.w, "if c.Do() {")
 	defer fmt.Fprintln(g.w, "}")
 	if len(types) == 1 {
 		fmt.Fprintf(g.w, "c.Ret = %s(%s)", x.Name.Name, argList)
 	} else {
 		fmt.Fprintf(g.w, "c.Ret, c.Err = %s(%s)", x.Name.Name, argList)
 	}
 }

 func (g *generator) goKind(expr ast.Expr) string {
 	if star, isStar := expr.(*ast.StarExpr); isStar {
 		expr = star.X
 	}
 	w := &bytes.Buffer{}
 	printer.Fprint(w, g.fset, expr)
 	switch str := w.String(); str {
 	case "big.Int":
 		return "bigInt"
 	case "big.Float":
 		return "bigFloat"
 	case "big.Rat":
 		return "bigRat"
 	case "adt.Bottom":
 		return "error"
 	case "internal.Decimal":
 		return "decimal"
 	case "[]*internal.Decimal":
 		return "decimalList"
 	case "cue.Struct":
 		return "struct"
 	case "cue.Value":
 		return "value"
 	case "cue.List":
 		return "list"
 	case "[]string":
 		return "stringList"
 	case "[]byte":
 		return "bytes"
 	case "[]cue.Value":
 		return "list"
 	case "io.Reader":
 		return "reader"
 	case "time.Time":
 		return "string"
 	default:
 		return str
 	}
 }

 func (g *generator) goToCUE(expr ast.Expr) (cueKind string) {
 	// TODO: detect list and structs types for return values.
 	switch k := g.goKind(expr); k {
 	case "error":
 		cueKind += "adt.BottomKind"
 	case "bool":
 		cueKind += "adt.BoolKind"
 	case "bytes", "reader":
 		cueKind += "adt.BytesKind|adt.StringKind"
 	case "string":
 		cueKind += "adt.StringKind"
 	case "int", "int8", "int16", "int32", "rune", "int64",
 		"uint", "byte", "uint8", "uint16", "uint32", "uint64",
 		"bigInt":
 		cueKind += "adt.IntKind"
 	case "float64", "bigRat", "bigFloat", "decimal":
 		cueKind += "adt.NumKind"
 	case "list", "decimalList", "stringList":
 		cueKind += "adt.ListKind"
 	case "struct":
 		cueKind += "adt.StructKind"
 	case "value":
 		// Must use callCtxt.value method for these types and resolve manually.
 		cueKind += "adt.TopKind" // TODO: can be more precise
 	default:
 		switch {
 		case strings.HasPrefix(k, "[]"):
 			cueKind += "adt.ListKind"
 		case strings.HasPrefix(k, "map["):
 			cueKind += "adt.StructKind"
 		default:
 			// log.Println("Unknown type:", k)
 			// Must use callCtxt.value method for these types and resolve manually.
 			cueKind += "adt.TopKind" // TODO: can be more precise
 		}
 	}
 	return cueKind
 }
	// Copyright 2018 The CUE Authors
	//
	// Licensed under the Apache License, Version 2.0 (the "License");
	// you may not use this file except in compliance with the License.
	// You may obtain a copy of the License at
	//
	// http://www.apache.org/licenses/LICENSE-2.0
	//
	// Unless required by applicable law or agreed to in writing, software
	// distributed under the License is distributed on an "AS IS" BASIS,
	// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	// See the License for the specific language governing permissions and
	// limitations under the License.

	// Package gen is a command that can be used to bootstrap a new builtin package
	// directory. The directory has to reside in cuelang.org/go/pkg.
	//
	// To bootstrap a directory, run this command from within that direcory.
	// After that directory's files can be regenerated with go generate.
	//
	// Be sure to also update an entry in pkg/pkg.go, if so desired.
	package main

	import (
	"bytes"
	"flag"
	"fmt"
	"go/ast"
	"go/constant"
	"go/format"
	"go/parser"
	"go/printer"
	"go/token"
	"io"
	"io/ioutil"
	"log"
	"math/big"
	"os"
	"path"
	"path/filepath"
	"strings"

	"cuelang.org/go/cue"
	"cuelang.org/go/cue/errors"
	cueformat "cuelang.org/go/cue/format"
	"cuelang.org/go/cue/load"
	"cuelang.org/go/internal"
	)

	const genFile = "pkg.go"

	const prefix = "../pkg/"

	const header = `// Code generated by go generate. DO NOT EDIT.

	//go:generate rm %s
	//go:generate go run %sgen/gen.go

	package %s

	import (
	"cuelang.org/go/internal/core/adt"
	"cuelang.org/go/pkg/internal"
	)

	func init() {
	internal.Register(%q, pkg)
	}

	var _ = adt.TopKind // in case the adt package isn't used

	`

	func main() {
	flag.Parse()
	log.SetFlags(log.Lshortfile)
	log.SetOutput(os.Stdout)

	g := generator{
	w: &bytes.Buffer{},
	decls: &bytes.Buffer{},
	fset: token.NewFileSet(),
	}

	cwd, _ := os.Getwd()
	pkg := strings.Split(filepath.ToSlash(cwd), "/pkg/")[1]
	gopkg := path.Base(pkg)
	// TODO: rename list to lists and struct to structs.
	if gopkg == "struct" {
	gopkg = "structs"
	}
	dots := strings.Repeat("../", strings.Count(pkg, "/")+1)

	w := &bytes.Buffer{}
	fmt.Fprintf(w, header, genFile, dots, gopkg, pkg)
	g.processDir(pkg)

	io.Copy(w, g.decls)
	io.Copy(w, g.w)

	b, err := format.Source(w.Bytes())
	if err != nil {
	b = w.Bytes() // write the unformatted source
	}

	b = bytes.Replace(b, []byte(".Builtin{{}}"), []byte(".Builtin{}"), -1)

	filename := filepath.Join(genFile)

	if err := ioutil.WriteFile(filename, b, 0644); err != nil {
	log.Fatal(err)
	}
	}

	type generator struct {
	w *bytes.Buffer
	decls *bytes.Buffer
	name string
	fset *token.FileSet
	defaultPkg string
	first bool
	iota int

	imports []*ast.ImportSpec
	}

	func (g *generator) processDir(pkg string) {
	goFiles, err := filepath.Glob("*.go")
	if err != nil {
	log.Fatal(err)
	}

	cueFiles, err := filepath.Glob("*.cue")
	if err != nil {
	log.Fatal(err)
	}

	if len(goFiles)+len(cueFiles) == 0 {
	return
	}

	fmt.Fprintf(g.w, "var pkg = &internal.Package{\nNative: []*internal.Builtin{{\n")
	g.first = true
	for _, filename := range goFiles {
	if filename == genFile {
	continue
	}
	g.processGo(filename)
	}
	fmt.Fprintf(g.w, "}},\n")
	g.processCUE(pkg)
	fmt.Fprintf(g.w, "}\n")
	}

	func (g *generator) sep() {
	if g.first {
	g.first = false
	return
	}
	fmt.Fprintln(g.w, "}, {")
	}

	// processCUE mixes in CUE definitions defined in the package directory.
	func (g *generator) processCUE(pkg string) {
	instances := cue.Build(load.Instances([]string{"."}, &load.Config{
	StdRoot: ".",
	}))

	if err := instances[0].Err; err != nil {
	if !strings.Contains(err.Error(), "no CUE files") {
	errors.Print(os.Stderr, err, nil)
	log.Fatalf("error processing %s: %v", pkg, err)
	}
	return
	}

	v := instances[0].Value().Syntax(cue.Raw())
	// fmt.Printf("%T\n", v)
	// fmt.Println(internal.DebugStr(v))
	n := internal.ToExpr(v)
	b, err := cueformat.Node(n)
	if err != nil {
	log.Fatal(err)
	}
	b = bytes.ReplaceAll(b, []byte("\n\n"), []byte("\n"))
	// body = strings.ReplaceAll(body, "\t", "")
	// TODO: escape backtick
	fmt.Fprintf(g.w, "CUE: `%s`,\n", string(b))
	}

	func (g *generator) processGo(filename string) {
	if strings.HasSuffix(filename, "_test.go") {
	return
	}
	f, err := parser.ParseFile(g.fset, filename, nil, parser.ParseComments)
	if err != nil {
	log.Fatal(err)
	}
	g.defaultPkg = ""
	g.name = f.Name.Name
	if g.name == "structs" {
	g.name = "struct"
	}

	for _, d := range f.Decls {
	switch x := d.(type) {
	case *ast.GenDecl:
	switch x.Tok {
	case token.CONST:
	for _, spec := range x.Specs {
	if !ast.IsExported(spec.(*ast.ValueSpec).Names[0].Name) {
	continue
	}
	g.genConst(spec.(*ast.ValueSpec))
	}
	case token.VAR:
	continue
	case token.TYPE:
	// TODO: support type declarations.
	continue
	case token.IMPORT:
	continue
	default:
	log.Fatalf("gen %s: unexpected spec of type %s", filename, x.Tok)
	}
	case *ast.FuncDecl:
	g.genFun(x)
	}
	}
	}

	func (g generator) genConst(spec ast.ValueSpec) {
	name := spec.Names[0].Name
	value := ""
	switch v := g.toValue(spec.Values[0]); v.Kind() {
	case constant.Bool, constant.Int, constant.String:
	// TODO: convert octal numbers
	value = v.ExactString()
	case constant.Float:
	var rat big.Rat
	rat.SetString(v.ExactString())
	var float big.Float
	float.SetRat(&rat)
	value = float.Text('g', -1)
	default:
	fmt.Printf("Dropped entry %s.%s (%T: %v)\n", g.defaultPkg, name, v.Kind(), v.ExactString())
	return
	}
	g.sep()
	fmt.Fprintf(g.w, "Name: %q,\n Const: %q,\n", name, value)
	}

	func (g *generator) toValue(x ast.Expr) constant.Value {
	switch x := x.(type) {
	case *ast.BasicLit:
	return constant.MakeFromLiteral(x.Value, x.Kind, 0)
	case *ast.BinaryExpr:
	return constant.BinaryOp(g.toValue(x.X), x.Op, g.toValue(x.Y))
	case *ast.UnaryExpr:
	return constant.UnaryOp(x.Op, g.toValue(x.X), 0)
	default:
	log.Fatalf("%s: unsupported expression type %T: %#v", g.defaultPkg, x, x)
	}
	return constant.MakeUnknown()
	}

	func (g generator) genFun(x ast.FuncDecl) {
	if x.Body == nil \|\| !ast.IsExported(x.Name.Name) {
	return
	}
	types := []string{}
	if x.Type.Results != nil {
	for _, f := range x.Type.Results.List {
	if len(f.Names) > 0 {
	for range f.Names {
	types = append(types, g.goKind(f.Type))
	}
	} else {
	types = append(types, g.goKind(f.Type))
	}
	}
	}
	if n := len(types); n != 1 && (n != 2 \|\| types[1] != "error") {
	fmt.Printf("Dropped func %s.%s: must have one return value or a value and an error %v\n", g.defaultPkg, x.Name.Name, types)
	return
	}

	if x.Recv != nil {
	// if strings.HasPrefix(x.Name.Name, g.name) {
	// printer.Fprint(g.decls, g.fset, x)
	// fmt.Fprint(g.decls, "\n\n")
	// }
	return
	}

	g.sep()
	fmt.Fprintf(g.w, "Name: %q,\n", x.Name.Name)

	args := []string{}
	vals := []string{}
	kind := []string{}
	for _, f := range x.Type.Params.List {
	for _, name := range f.Names {
	typ := strings.Title(g.goKind(f.Type))
	argKind := g.goToCUE(f.Type)
	vals = append(vals, fmt.Sprintf("c.%s(%d)", typ, len(args)))
	args = append(args, name.Name)
	kind = append(kind, argKind)
	}
	}

	fmt.Fprintf(g.w, "Params: []internal.Param{\n")
	for _, k := range kind {
	fmt.Fprintf(g.w, "{Kind: %s},\n", k)
	}
	fmt.Fprintf(g.w, "\n},\n")

	expr := x.Type.Results.List[0].Type
	fmt.Fprintf(g.w, "Result: %s,\n", g.goToCUE(expr))

	argList := strings.Join(args, ", ")
	valList := strings.Join(vals, ", ")
	init := ""
	if len(args) > 0 {
	init = fmt.Sprintf("%s := %s", argList, valList)
	}

	fmt.Fprintf(g.w, "Func: func(c *internal.CallCtxt) {")
	defer fmt.Fprintln(g.w, "},")
	fmt.Fprintln(g.w)
	if init != "" {
	fmt.Fprintln(g.w, init)
	}
	fmt.Fprintln(g.w, "if c.Do() {")
	defer fmt.Fprintln(g.w, "}")
	if len(types) == 1 {
	fmt.Fprintf(g.w, "c.Ret = %s(%s)", x.Name.Name, argList)
	} else {
	fmt.Fprintf(g.w, "c.Ret, c.Err = %s(%s)", x.Name.Name, argList)
	}
	}

	func (g *generator) goKind(expr ast.Expr) string {
	if star, isStar := expr.(*ast.StarExpr); isStar {
	expr = star.X
	}
	w := &bytes.Buffer{}
	printer.Fprint(w, g.fset, expr)
	switch str := w.String(); str {
	case "big.Int":
	return "bigInt"
	case "big.Float":
	return "bigFloat"
	case "big.Rat":
	return "bigRat"
	case "adt.Bottom":
	return "error"
	case "internal.Decimal":
	return "decimal"
	case "[]*internal.Decimal":
	return "decimalList"
	case "cue.Struct":
	return "struct"
	case "cue.Value":
	return "value"
	case "cue.List":
	return "list"
	case "[]string":
	return "stringList"
	case "[]byte":
	return "bytes"
	case "[]cue.Value":
	return "list"
	case "io.Reader":
	return "reader"
	case "time.Time":
	return "string"
	default:
	return str
	}
	}

	func (g *generator) goToCUE(expr ast.Expr) (cueKind string) {
	// TODO: detect list and structs types for return values.
	switch k := g.goKind(expr); k {
	case "error":
	cueKind += "adt.BottomKind"
	case "bool":
	cueKind += "adt.BoolKind"
	case "bytes", "reader":
	cueKind += "adt.BytesKind\|adt.StringKind"
	case "string":
	cueKind += "adt.StringKind"
	case "int", "int8", "int16", "int32", "rune", "int64",
	"uint", "byte", "uint8", "uint16", "uint32", "uint64",
	"bigInt":
	cueKind += "adt.IntKind"
	case "float64", "bigRat", "bigFloat", "decimal":
	cueKind += "adt.NumKind"
	case "list", "decimalList", "stringList":
	cueKind += "adt.ListKind"
	case "struct":
	cueKind += "adt.StructKind"
	case "value":
	// Must use callCtxt.value method for these types and resolve manually.
	cueKind += "adt.TopKind" // TODO: can be more precise
	default:
	switch {
	case strings.HasPrefix(k, "[]"):
	cueKind += "adt.ListKind"
	case strings.HasPrefix(k, "map["):
	cueKind += "adt.StructKind"
	default:
	// log.Println("Unknown type:", k)
	// Must use callCtxt.value method for these types and resolve manually.
	cueKind += "adt.TopKind" // TODO: can be more precise
	}
	}
	return cueKind
	}