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// Copyright 2020 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 cmd
import (
"fmt"
"path/filepath"
"regexp"
"strconv"
"cuelang.org/go/cue"
"cuelang.org/go/cue/ast"
"cuelang.org/go/cue/ast/astutil"
"cuelang.org/go/cue/build"
"cuelang.org/go/cue/errors"
"cuelang.org/go/cue/parser"
"cuelang.org/go/cue/token"
"cuelang.org/go/internal"
)
// This file contains logic for placing orphan files within a CUE namespace.
func (b *buildPlan) usePlacement() bool {
return b.perFile || b.useList || len(b.path) > 0
}
func (b *buildPlan) parsePlacementFlags() error {
cmd := b.cmd
b.perFile = flagFiles.Bool(cmd)
b.useList = flagList.Bool(cmd)
b.path = flagPath.StringArray(cmd)
b.useContext = flagWithContext.Bool(cmd)
if !b.importing && !b.perFile && !b.useList && len(b.path) == 0 {
if b.useContext {
return fmt.Errorf(
"flag %q must be used with at least one of flag %q, %q, or %q",
flagWithContext, flagPath, flagList, flagFiles,
)
}
} else if b.schema != nil {
return fmt.Errorf(
"cannot combine --%s flag with flag %q, %q, or %q",
flagSchema, flagPath, flagList, flagFiles,
)
}
return nil
}
func (b *buildPlan) placeOrphans(i *build.Instance, a []*decoderInfo) error {
pkg := b.encConfig.PkgName
if pkg == "" {
pkg = i.PkgName
} else if pkg != "" && i.PkgName != "" && i.PkgName != pkg && !flagForce.Bool(b.cmd) {
return fmt.Errorf(
"%q flag clashes with existing package name (%s vs %s)",
flagPackage, pkg, i.PkgName,
)
}
var files []*ast.File
re, err := regexp.Compile(b.cfg.fileFilter)
if err != nil {
return err
}
for _, di := range a {
if !i.User && !re.MatchString(filepath.Base(di.file.Filename)) {
continue
}
d := di.dec(b)
var objs []*ast.File
// Filter only need to filter files that can stream:
for ; !d.Done(); d.Next() {
if f := d.File(); f != nil {
f.Filename = newName(d.Filename(), 0)
objs = append(objs, f)
}
}
if err := d.Err(); err != nil {
return err
}
if b.perFile {
for i, obj := range objs {
f, err := placeOrphans(b.cmd, d.Filename(), pkg, obj)
if err != nil {
return err
}
f.Filename = newName(d.Filename(), i)
files = append(files, f)
}
continue
}
// TODO: consider getting rid of this requirement. It is important that
// import will catch conflicts ahead of time then, though, and report
// this messages as a possible solution if there are conflicts.
if b.importing && len(objs) > 1 && len(b.path) == 0 && !b.useList {
return fmt.Errorf(
"%s, %s, or %s flag needed to handle multiple objects in file %s",
flagPath, flagList, flagFiles, shortFile(i.Root, di.file))
}
if !b.useList && len(b.path) == 0 && !b.useContext {
for _, f := range objs {
if pkg := b.encConfig.PkgName; pkg != "" {
internal.SetPackage(f, pkg, false)
}
files = append(files, f)
}
} else {
// TODO: handle imports correctly, i.e. for proto.
f, err := placeOrphans(b.cmd, d.Filename(), pkg, objs...)
if err != nil {
return err
}
f.Filename = newName(d.Filename(), 0)
files = append(files, f)
}
}
b.imported = append(b.imported, files...)
for _, f := range files {
if err := i.AddSyntax(f); err != nil {
return err
}
}
return nil
}
func placeOrphans(cmd *Command, filename, pkg string, objs ...*ast.File) (*ast.File, error) {
f := &ast.File{}
index := newIndex()
for i, file := range objs {
if i == 0 {
astutil.CopyMeta(f, file)
}
expr := internal.ToExpr(file)
p, _, _ := internal.PackageInfo(file)
var pathElems []ast.Label
var pathTokens []token.Token
switch {
case len(flagPath.StringArray(cmd)) > 0:
expr := expr
if flagWithContext.Bool(cmd) {
expr = ast.NewStruct(
"data", expr,
"filename", ast.NewString(filename),
"index", ast.NewLit(token.INT, strconv.Itoa(i)),
"recordCount", ast.NewLit(token.INT, strconv.Itoa(len(objs))),
)
}
var f *ast.File
if s, ok := expr.(*ast.StructLit); ok {
f = &ast.File{Decls: s.Elts}
} else {
f = &ast.File{Decls: []ast.Decl{&ast.EmbedDecl{Expr: expr}}}
}
err := astutil.Sanitize(f)
if err != nil {
return nil, errors.Wrapf(err, token.NoPos,
"invalid combination of input files")
}
inst, err := runtime.CompileFile(f)
if err != nil {
return nil, err
}
for _, str := range flagPath.StringArray(cmd) {
l, err := parser.ParseExpr("--path", str)
if err != nil {
labels, tokens, err := parseFullPath(inst, str)
if err != nil {
return nil, fmt.Errorf(
`labels must be expressions (-l foo -l 'strings.ToLower(bar)') or full paths (-l '"foo": "\(strings.ToLower(bar))":) : %v`, err)
}
pathElems = append(pathElems, labels...)
pathTokens = append(pathTokens, tokens...)
continue
}
str, err := inst.Eval(l).String()
if err != nil {
return nil, fmt.Errorf("unsupported label path type: %v", err)
}
pathElems = append(pathElems, ast.NewString(str))
pathTokens = append(pathTokens, 0)
}
}
if flagList.Bool(cmd) {
idx := index
for _, e := range pathElems {
idx = idx.label(e)
}
if idx.field.Value == nil {
idx.field.Value = &ast.ListLit{
Lbrack: token.NoSpace.Pos(),
Rbrack: token.NoSpace.Pos(),
}
}
list := idx.field.Value.(*ast.ListLit)
list.Elts = append(list.Elts, expr)
} else if len(pathElems) == 0 {
obj, ok := expr.(*ast.StructLit)
if !ok {
if _, ok := expr.(*ast.ListLit); ok {
return nil, fmt.Errorf("expected struct as object root, did you mean to use the --list flag?")
}
return nil, fmt.Errorf("cannot map non-struct to object root")
}
f.Decls = append(f.Decls, obj.Elts...)
} else {
field := &ast.Field{Label: pathElems[0]}
field.Token = pathTokens[0]
f.Decls = append(f.Decls, field)
if p != nil {
astutil.CopyComments(field, p)
}
for i, e := range pathElems[1:] {
newField := &ast.Field{Label: e}
newVal := ast.NewStruct(newField)
newField.Token = pathTokens[i+1]
field.Value = newVal
field = newField
}
field.Value = expr
}
}
if pkg != "" {
internal.SetPackage(f, pkg, false)
}
if flagList.Bool(cmd) {
switch x := index.field.Value.(type) {
case *ast.StructLit:
f.Decls = append(f.Decls, x.Elts...)
case *ast.ListLit:
f.Decls = append(f.Decls, &ast.EmbedDecl{Expr: x})
default:
panic("unreachable")
}
}
return f, astutil.Sanitize(f)
}
func parseFullPath(inst *cue.Instance, exprs string) (p []ast.Label, t []token.Token, err error) {
f, err := parser.ParseFile("--path", exprs+"_")
if err != nil {
return nil, nil, fmt.Errorf("parser error in path %q: %v", exprs, err)
}
if len(f.Decls) != 1 {
return nil, nil, errors.New("path flag must be a space-separated sequence of labels")
}
for d := f.Decls[0]; ; {
field, ok := d.(*ast.Field)
if !ok {
// This should never happen
return nil, nil, errors.New("%q not a sequence of labels")
}
t = append(t, field.Token)
switch x := field.Label.(type) {
case *ast.Ident, *ast.BasicLit:
p = append(p, x)
case *ast.TemplateLabel:
return nil, nil, fmt.Errorf("template labels not supported in path flag")
case ast.Expr:
v := inst.Eval(x)
if v.Kind() == cue.BottomKind {
return nil, nil, v.Err()
}
p = append(p, v.Syntax().(ast.Label))
}
v, ok := field.Value.(*ast.StructLit)
if !ok {
break
}
if len(v.Elts) != 1 {
return nil, nil, errors.New("path value may not contain a struct")
}
d = v.Elts[0]
}
return p, t, nil
}
type listIndex struct {
index map[string]*listIndex
field *ast.Field
}
func newIndex() *listIndex {
return &listIndex{
index: map[string]*listIndex{},
field: &ast.Field{},
}
}
func (x *listIndex) label(label ast.Label) *listIndex {
key := internal.DebugStr(label)
idx := x.index[key]
if idx == nil {
if x.field.Value == nil {
x.field.Value = &ast.StructLit{}
}
obj := x.field.Value.(*ast.StructLit)
newField := &ast.Field{Label: label}
obj.Elts = append(obj.Elts, newField)
idx = &listIndex{
index: map[string]*listIndex{},
field: newField,
}
x.index[key] = idx
}
return idx
}
func newName(filename string, i int) string {
if filename == "-" {
return filename
}
ext := filepath.Ext(filename)
filename = filename[:len(filename)-len(ext)]
if i > 0 {
filename += fmt.Sprintf("-%d", i)
}
filename += ".cue"
return filename
}