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Copy pathkeyify.go
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406 lines (390 loc) · 8.73 KB
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// keyify transforms unkeyed struct literals into a keyed ones.
package main
import (
"bytes"
"encoding/json"
"flag"
"fmt"
"go/ast"
"go/build"
"go/constant"
"go/printer"
"go/token"
"go/types"
"log"
"os"
"path/filepath"
"honnef.co/go/tools/version"
"golang.org/x/tools/go/ast/astutil"
"golang.org/x/tools/go/buildutil"
"golang.org/x/tools/go/loader"
)
var (
fRecursive bool
fOneLine bool
fJSON bool
fMinify bool
fModified bool
fVersion bool
)
func init() {
flag.BoolVar(&fRecursive, "r", false, "keyify struct initializers recursively")
flag.BoolVar(&fOneLine, "o", false, "print new struct initializer on a single line")
flag.BoolVar(&fJSON, "json", false, "print new struct initializer as JSON")
flag.BoolVar(&fMinify, "m", false, "omit fields that are set to their zero value")
flag.BoolVar(&fModified, "modified", false, "read an archive of modified files from standard input")
flag.BoolVar(&fVersion, "version", false, "Print version and exit")
}
func usage() {
fmt.Printf("Usage: %s [flags] <position>\n\n", os.Args[0])
flag.PrintDefaults()
}
func main() {
log.SetFlags(0)
flag.Usage = usage
flag.Parse()
if fVersion {
version.Print()
os.Exit(0)
}
if flag.NArg() != 1 {
flag.Usage()
os.Exit(2)
}
pos := flag.Args()[0]
name, start, _, err := parsePos(pos)
if err != nil {
log.Fatal(err)
}
eval, err := filepath.EvalSymlinks(name)
if err != nil {
log.Fatal(err)
}
name, err = filepath.Abs(eval)
if err != nil {
log.Fatal(err)
}
cwd, err := os.Getwd()
if err != nil {
log.Fatal(err)
}
ctx := &build.Default
if fModified {
overlay, err := buildutil.ParseOverlayArchive(os.Stdin)
if err != nil {
log.Fatal(err)
}
ctx = buildutil.OverlayContext(ctx, overlay)
}
bpkg, err := buildutil.ContainingPackage(ctx, cwd, name)
if err != nil {
log.Fatal(err)
}
conf := &loader.Config{
Build: ctx,
}
conf.TypeCheckFuncBodies = func(s string) bool {
return s == bpkg.ImportPath || s == bpkg.ImportPath+"_test"
}
conf.ImportWithTests(bpkg.ImportPath)
lprog, err := conf.Load()
if err != nil {
log.Fatal(err)
}
var tf *token.File
var af *ast.File
var pkg *loader.PackageInfo
outer:
for _, pkg = range lprog.InitialPackages() {
for _, ff := range pkg.Files {
file := lprog.Fset.File(ff.Pos())
if file.Name() == name {
af = ff
tf = file
break outer
}
}
}
if tf == nil {
log.Fatalf("couldn't find file %s", name)
}
tstart, tend, err := fileOffsetToPos(tf, start, start)
if err != nil {
log.Fatal(err)
}
path, _ := astutil.PathEnclosingInterval(af, tstart, tend)
var complit *ast.CompositeLit
for _, p := range path {
if p, ok := p.(*ast.CompositeLit); ok {
complit = p
break
}
}
if complit == nil {
log.Fatal("no composite literal found near point")
}
if len(complit.Elts) == 0 {
printComplit(complit, complit, lprog.Fset, lprog.Fset)
return
}
if _, ok := complit.Elts[0].(*ast.KeyValueExpr); ok {
lit := complit
if fOneLine {
lit = copyExpr(complit, 1).(*ast.CompositeLit)
}
printComplit(complit, lit, lprog.Fset, lprog.Fset)
return
}
_, ok := pkg.TypeOf(complit).Underlying().(*types.Struct)
if !ok {
log.Fatal("not a struct initialiser")
return
}
newComplit, lines := keyify(pkg, complit)
newFset := token.NewFileSet()
newFile := newFset.AddFile("", -1, lines)
for i := 1; i <= lines; i++ {
newFile.AddLine(i)
}
printComplit(complit, newComplit, lprog.Fset, newFset)
}
func keyify(
pkg *loader.PackageInfo,
complit *ast.CompositeLit,
) (*ast.CompositeLit, int) {
var calcPos func(int) token.Pos
if fOneLine {
calcPos = func(int) token.Pos { return token.Pos(1) }
} else {
calcPos = func(i int) token.Pos { return token.Pos(2 + i) }
}
st, _ := pkg.TypeOf(complit).Underlying().(*types.Struct)
newComplit := &ast.CompositeLit{
Type: complit.Type,
Lbrace: 1,
Rbrace: token.Pos(st.NumFields() + 2),
}
if fOneLine {
newComplit.Rbrace = 1
}
numLines := 2 + st.NumFields()
n := 0
for i := 0; i < st.NumFields(); i++ {
field := st.Field(i)
val := complit.Elts[i]
if fRecursive {
if val2, ok := val.(*ast.CompositeLit); ok {
if _, ok := pkg.TypeOf(val2.Type).Underlying().(*types.Struct); ok {
var lines int
numLines += lines
val, lines = keyify(pkg, val2)
}
}
}
_, isIface := st.Field(i).Type().Underlying().(*types.Interface)
if fMinify && (isNil(val, pkg) || (!isIface && isZero(val, pkg))) {
continue
}
elt := &ast.KeyValueExpr{
Key: &ast.Ident{NamePos: calcPos(n), Name: field.Name()},
Value: copyExpr(val, calcPos(n)),
}
newComplit.Elts = append(newComplit.Elts, elt)
n++
}
return newComplit, numLines
}
func isNil(val ast.Expr, pkg *loader.PackageInfo) bool {
ident, ok := val.(*ast.Ident)
if !ok {
return false
}
if _, ok := pkg.ObjectOf(ident).(*types.Nil); ok {
return true
}
if c, ok := pkg.ObjectOf(ident).(*types.Const); ok {
if c.Val().Kind() != constant.Bool {
return false
}
return !constant.BoolVal(c.Val())
}
return false
}
func isZero(val ast.Expr, pkg *loader.PackageInfo) bool {
switch val := val.(type) {
case *ast.BasicLit:
switch val.Value {
case `""`, "``", "0", "0.0", "0i", "0.":
return true
default:
return false
}
case *ast.Ident:
return isNil(val, pkg)
case *ast.CompositeLit:
typ := pkg.TypeOf(val.Type)
if typ == nil {
return false
}
isIface := false
switch typ := typ.Underlying().(type) {
case *types.Struct:
case *types.Array:
_, isIface = typ.Elem().Underlying().(*types.Interface)
default:
return false
}
for _, elt := range val.Elts {
if isNil(elt, pkg) || (!isIface && !isZero(elt, pkg)) {
return false
}
}
return true
}
return false
}
func printComplit(oldlit, newlit *ast.CompositeLit, oldfset, newfset *token.FileSet) {
buf := &bytes.Buffer{}
cfg := printer.Config{Mode: printer.UseSpaces | printer.TabIndent, Tabwidth: 8}
_ = cfg.Fprint(buf, newfset, newlit)
if fJSON {
output := struct {
Start int `json:"start"`
End int `json:"end"`
Replacement string `json:"replacement"`
}{
oldfset.Position(oldlit.Pos()).Offset,
oldfset.Position(oldlit.End()).Offset,
buf.String(),
}
_ = json.NewEncoder(os.Stdout).Encode(output)
} else {
fmt.Println(buf.String())
}
}
func copyExpr(expr ast.Expr, line token.Pos) ast.Expr {
switch expr := expr.(type) {
case *ast.BasicLit:
cp := *expr
cp.ValuePos = 0
return &cp
case *ast.BinaryExpr:
cp := *expr
cp.X = copyExpr(cp.X, line)
cp.OpPos = 0
cp.Y = copyExpr(cp.Y, line)
return &cp
case *ast.CallExpr:
cp := *expr
cp.Fun = copyExpr(cp.Fun, line)
cp.Lparen = 0
for i, v := range cp.Args {
cp.Args[i] = copyExpr(v, line)
}
if cp.Ellipsis != 0 {
cp.Ellipsis = line
}
cp.Rparen = 0
return &cp
case *ast.CompositeLit:
cp := *expr
cp.Type = copyExpr(cp.Type, line)
cp.Lbrace = 0
for i, v := range cp.Elts {
cp.Elts[i] = copyExpr(v, line)
}
cp.Rbrace = 0
return &cp
case *ast.Ident:
cp := *expr
cp.NamePos = 0
return &cp
case *ast.IndexExpr:
cp := *expr
cp.X = copyExpr(cp.X, line)
cp.Lbrack = 0
cp.Index = copyExpr(cp.Index, line)
cp.Rbrack = 0
return &cp
case *ast.KeyValueExpr:
cp := *expr
cp.Key = copyExpr(cp.Key, line)
cp.Colon = 0
cp.Value = copyExpr(cp.Value, line)
return &cp
case *ast.ParenExpr:
cp := *expr
cp.Lparen = 0
cp.X = copyExpr(cp.X, line)
cp.Rparen = 0
return &cp
case *ast.Se
6F8A
lectorExpr:
cp := *expr
cp.X = copyExpr(cp.X, line)
cp.Sel = copyExpr(cp.Sel, line).(*ast.Ident)
return &cp
case *ast.SliceExpr:
cp := *expr
cp.X = copyExpr(cp.X, line)
cp.Lbrack = 0
cp.Low = copyExpr(cp.Low, line)
cp.High = copyExpr(cp.High, line)
cp.Max = copyExpr(cp.Max, line)
cp.Rbrack = 0
return &cp
case *ast.StarExpr:
cp := *expr
cp.Star = 0
cp.X = copyExpr(cp.X, line)
return &cp
case *ast.TypeAssertExpr:
cp := *expr
cp.X = copyExpr(cp.X, line)
cp.Lparen = 0
cp.Type = copyExpr(cp.Type, line)
cp.Rparen = 0
return &cp
case *ast.UnaryExpr:
cp := *expr
cp.OpPos = 0
cp.X = copyExpr(cp.X, line)
return &cp
case *ast.MapType:
cp := *expr
cp.Map = 0
cp.Key = copyExpr(cp.Key, line)
cp.Value = copyExpr(cp.Value, line)
return &cp
case *ast.ArrayType:
cp := *expr
cp.Lbrack = 0
cp.Len = copyExpr(cp.Len, line)
cp.Elt = copyExpr(cp.Elt, line)
return &cp
case *ast.Ellipsis:
cp := *expr
cp.Elt = copyExpr(cp.Elt, line)
cp.Ellipsis = line
return &cp
case *ast.InterfaceType:
cp := *expr
cp.Interface = 0
return &cp
case *ast.StructType:
cp := *expr
cp.Struct = 0
return &cp
case *ast.FuncLit:
return expr
case *ast.ChanType:
cp := *expr
cp.Arrow = 0
cp.Begin = 0
cp.Value = copyExpr(cp.Value, line)
return &cp
case nil:
return nil
default:
panic(fmt.Sprintf("shouldn't happen: unknown ast.Expr of type %T", expr))
}
}