How to use Format method of ast Package

Best Syzkaller code snippet using ast.Format

stmt_expr_or_type.go

Source:stmt_expr_or_type.go

1/*2 * Copyright (c) 2021 The GoPlus Authors (goplus.org). All rights reserved.3 *4 * Licensed under the Apache License, Version 2.0 (the "License");5 * you may not use this file except in compliance with the License.6 * You may obtain a copy of the License at7 *8 *     http://www.apache.org/licenses/LICENSE-2.09 *10 * Unless required by applicable law or agreed to in writing, software11 * distributed under the License is distributed on an "AS IS" BASIS,12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.13 * See the License for the specific language governing permissions and14 * limitations under the License.15 */16package format17import (18	"go/token"19	"log"20	"reflect"21	"github.com/goplus/gop/ast"22)23// -----------------------------------------------------------------------------24func formatType(ctx *formatCtx, typ ast.Expr, ref *ast.Expr) {25	switch t := typ.(type) {26	case *ast.Ident, nil:27	case *ast.SelectorExpr:28		formatSelectorExpr(ctx, t, ref)29	case *ast.StarExpr:30		formatType(ctx, t.X, &t.X)31	case *ast.MapType:32		formatType(ctx, t.Key, &t.Key)33		formatType(ctx, t.Value, &t.Value)34	case *ast.StructType:35		formatFields(ctx, t.Fields)36	case *ast.ArrayType:37		formatExpr(ctx, t.Len, &t.Len)38		formatType(ctx, t.Elt, &t.Elt)39	case *ast.ChanType:40		formatType(ctx, t.Value, &t.Value)41	case *ast.InterfaceType:42		formatFields(ctx, t.Methods)43	case *ast.FuncType:44		formatFuncType(ctx, t)45	case *ast.Ellipsis:46		formatType(ctx, t.Elt, &t.Elt)47	default:48		log.Panicln("TODO: format -", reflect.TypeOf(typ))49	}50}51func formatFuncType(ctx *formatCtx, t *ast.FuncType) {52	formatFields(ctx, t.Params)53	formatFields(ctx, t.Results)54}55func formatFields(ctx *formatCtx, flds *ast.FieldList) {56	if flds != nil {57		for _, fld := range flds.List {58			formatField(ctx, fld)59		}60	}61}62func formatField(ctx *formatCtx, fld *ast.Field) {63	formatType(ctx, fld.Type, &fld.Type)64}65// -----------------------------------------------------------------------------66func formatExprs(ctx *formatCtx, exprs []ast.Expr) {67	for i, expr := range exprs {68		formatExpr(ctx, expr, &exprs[i])69	}70}71func formatExpr(ctx *formatCtx, expr ast.Expr, ref *ast.Expr) {72	switch v := expr.(type) {73	case *ast.Ident, *ast.BasicLit, *ast.BadExpr, nil:74	case *ast.BinaryExpr:75		formatExpr(ctx, v.X, &v.X)76		formatExpr(ctx, v.Y, &v.Y)77	case *ast.UnaryExpr:78		formatExpr(ctx, v.X, &v.X)79	case *ast.CallExpr:80		formatCallExpr(ctx, v)81	case *ast.SelectorExpr:82		formatSelectorExpr(ctx, v, ref)83	case *ast.SliceExpr:84		formatSliceExpr(ctx, v)85	case *ast.IndexExpr:86		formatExpr(ctx, v.X, &v.X)87		formatExpr(ctx, v.Index, &v.Index)88	case *ast.SliceLit:89		formatExprs(ctx, v.Elts)90	case *ast.CompositeLit:91		formatType(ctx, v.Type, &v.Type)92		formatExprs(ctx, v.Elts)93	case *ast.StarExpr:94		formatExpr(ctx, v.X, &v.X)95	case *ast.KeyValueExpr:96		formatExpr(ctx, v.Key, &v.Key)97		formatExpr(ctx, v.Value, &v.Value)98	case *ast.FuncLit:99		formatFuncType(ctx, v.Type)100		formatBlockStmt(ctx, v.Body)101	case *ast.TypeAssertExpr:102		formatExpr(ctx, v.X, &v.X)103		formatType(ctx, v.Type, &v.Type)104	case *ast.LambdaExpr:105		formatExprs(ctx, v.Rhs)106	case *ast.LambdaExpr2:107		formatBlockStmt(ctx, v.Body)108	case *ast.RangeExpr:109		formatRangeExpr(ctx, v)110	case *ast.ComprehensionExpr:111		formatComprehensionExpr(ctx, v)112	case *ast.ErrWrapExpr:113		formatExpr(ctx, v.X, &v.X)114		formatExpr(ctx, v.Default, &v.Default)115	case *ast.ParenExpr:116		formatExpr(ctx, v.X, &v.X)117	case *ast.Ellipsis:118		formatExpr(ctx, v.Elt, &v.Elt)119	default:120		formatType(ctx, expr, ref)121	}122}123func formatRangeExpr(ctx *formatCtx, v *ast.RangeExpr) {124	formatExpr(ctx, v.First, &v.First)125	formatExpr(ctx, v.Last, &v.Last)126	formatExpr(ctx, v.Expr3, &v.Expr3)127}128func formatComprehensionExpr(ctx *formatCtx, v *ast.ComprehensionExpr) {129	old := ctx.enterBlock()130	defer ctx.leaveBlock(old)131	formatForPhrases(ctx, v.Fors)132	formatExpr(ctx, v.Elt, &v.Elt)133}134func formatForPhrases(ctx *formatCtx, fors []*ast.ForPhrase) {135	for _, f := range fors {136		formatForPhrase(ctx, f)137	}138}139func formatForPhrase(ctx *formatCtx, v *ast.ForPhrase) {140	formatExpr(ctx, v.X, &v.X)141	formatStmt(ctx, v.Init)142	formatExpr(ctx, v.Cond, &v.Cond)143}144func formatSliceExpr(ctx *formatCtx, v *ast.SliceExpr) {145	formatExpr(ctx, v.X, &v.X)146	formatExpr(ctx, v.Low, &v.Low)147	formatExpr(ctx, v.High, &v.High)148	formatExpr(ctx, v.Max, &v.Max)149}150func formatCallExpr(ctx *formatCtx, v *ast.CallExpr) {151	formatExpr(ctx, v.Fun, &v.Fun)152	fncallStartingLowerCase(v)153	formatExprs(ctx, v.Args)154}155func formatSelectorExpr(ctx *formatCtx, v *ast.SelectorExpr, ref *ast.Expr) {156	switch x := v.X.(type) {157	case *ast.Ident:158		if _, o := ctx.scope.LookupParent(x.Name, token.NoPos); o != nil {159			break160		}161		if imp, ok := ctx.imports[x.Name]; ok {162			if !fmtToBuiltin(imp, v.Sel, ref) {163				imp.isUsed = true164			}165		}166	default:167		formatExpr(ctx, x, &v.X)168	}169}170// -----------------------------------------------------------------------------171func formatBlockStmt(ctx *formatCtx, stmt *ast.BlockStmt) {172	if stmt != nil {173		old := ctx.enterBlock()174		defer ctx.leaveBlock(old)175		formatStmts(ctx, stmt.List)176	}177}178func formatStmts(ctx *formatCtx, stmts []ast.Stmt) {179	for _, stmt := range stmts {180		formatStmt(ctx, stmt)181	}182}183func formatStmt(ctx *formatCtx, stmt ast.Stmt) {184	switch v := stmt.(type) {185	case *ast.ExprStmt:186		formatExprStmt(ctx, v)187	case *ast.AssignStmt:188		formatAssignStmt(ctx, v)189	case *ast.IncDecStmt:190		formatExpr(ctx, v.X, &v.X)191	case *ast.ForStmt:192		formatForStmt(ctx, v)193	case *ast.RangeStmt:194		formatRangeStmt(ctx, v)195	case *ast.ForPhraseStmt:196		formatForPhraseStmt(ctx, v)197	case *ast.IfStmt:198		formatIfStmt(ctx, v)199	case *ast.CaseClause:200		formatExprs(ctx, v.List)201		formatStmts(ctx, v.Body)202	case *ast.SwitchStmt:203		formatSwitchStmt(ctx, v)204	case *ast.TypeSwitchStmt:205		formatTypeSwitchStmt(ctx, v)206	case *ast.CommClause:207		formatStmt(ctx, v.Comm)208		formatStmts(ctx, v.Body)209	case *ast.SelectStmt:210		formatBlockStmt(ctx, v.Body)211	case *ast.DeclStmt:212		formatDeclStmt(ctx, v)213	case *ast.ReturnStmt:214		formatExprs(ctx, v.Results)215	case *ast.BlockStmt:216		formatBlockStmt(ctx, v)217	case *ast.DeferStmt:218		formatCallExpr(ctx, v.Call)219	case *ast.GoStmt:220		formatCallExpr(ctx, v.Call)221	case *ast.SendStmt:222		formatExpr(ctx, v.Chan, &v.Chan)223		formatExpr(ctx, v.Value, &v.Value)224	case *ast.LabeledStmt:225		formatStmt(ctx, v.Stmt)226	case *ast.BranchStmt, *ast.EmptyStmt, nil, *ast.BadStmt:227	default:228		log.Panicln("TODO: formatStmt -", reflect.TypeOf(stmt))229	}230}231func formatExprStmt(ctx *formatCtx, v *ast.ExprStmt) {232	switch x := v.X.(type) {233	case *ast.CallExpr:234		commandStyleFirst(x)235	}236	formatExpr(ctx, v.X, &v.X)237}238func formatAssignStmt(ctx *formatCtx, v *ast.AssignStmt) {239	formatExprs(ctx, v.Lhs)240	formatExprs(ctx, v.Rhs)241}242func formatSwitchStmt(ctx *formatCtx, v *ast.SwitchStmt) {243	old := ctx.enterBlock()244	defer ctx.leaveBlock(old)245	formatStmt(ctx, v.Init)246	formatExpr(ctx, v.Tag, &v.Tag)247	formatBlockStmt(ctx, v.Body)248}249func formatTypeSwitchStmt(ctx *formatCtx, v *ast.TypeSwitchStmt) {250	old := ctx.enterBlock()251	defer ctx.leaveBlock(old)252	formatStmt(ctx, v.Init)253	formatStmt(ctx, v.Assign)254	formatBlockStmt(ctx, v.Body)255}256func formatIfStmt(ctx *formatCtx, v *ast.IfStmt) {257	old := ctx.enterBlock()258	defer ctx.leaveBlock(old)259	formatStmt(ctx, v.Init)260	formatExpr(ctx, v.Cond, &v.Cond)261	formatBlockStmt(ctx, v.Body)262	formatStmt(ctx, v.Else)263}264func formatRangeStmt(ctx *formatCtx, v *ast.RangeStmt) {265	old := ctx.enterBlock()266	defer ctx.leaveBlock(old)267	formatExpr(ctx, v.Key, &v.Key)268	formatExpr(ctx, v.Value, &v.Value)269	formatExpr(ctx, v.X, &v.X)270	formatBlockStmt(ctx, v.Body)271}272func formatForPhraseStmt(ctx *formatCtx, v *ast.ForPhraseStmt) {273	old := ctx.enterBlock()274	defer ctx.leaveBlock(old)275	formatForPhrase(ctx, v.ForPhrase)276	formatBlockStmt(ctx, v.Body)277}278func formatForStmt(ctx *formatCtx, v *ast.ForStmt) {279	old := ctx.enterBlock()280	defer ctx.leaveBlock(old)281	formatStmt(ctx, v.Init)282	formatExpr(ctx, v.Cond, &v.Cond)283	formatBlockStmt(ctx, v.Body)284}285func formatDeclStmt(ctx *formatCtx, v *ast.DeclStmt) {286	if decl, ok := v.Decl.(*ast.GenDecl); ok {287		formatGenDecl(ctx, decl)288	}289}290// -----------------------------------------------------------------------------...

errors.go

Source:errors.go

1// Copyright 2012 The Go Authors. All rights reserved.2// Use of this source code is governed by a BSD-style3// license that can be found in the LICENSE file.4// This file implements various error reporters.5package types6import (7	"bytes"8	"fmt"9	"go/ast"10	"go/token"11)12// TODO(gri) eventually assert and unimplemented should disappear.13func assert(p bool) {14	if !p {15		panic("assertion failed")16	}17}18func unreachable() {19	panic("unreachable")20}21func (check *checker) printTrace(format string, args []interface{}) {22	const dots = ".  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  "23	n := len(check.pos) - 124	i := 3 * n25	for i > len(dots) {26		fmt.Print(dots)27		i -= len(dots)28	}29	// i <= len(dots)30	fmt.Printf("%s:\t", check.fset.Position(check.pos[n]))31	fmt.Print(dots[0:i])32	fmt.Println(check.formatMsg(format, args))33}34func (check *checker) trace(pos token.Pos, format string, args ...interface{}) {35	check.pos = append(check.pos, pos)36	check.printTrace(format, args)37}38func (check *checker) untrace(format string, args ...interface{}) {39	if len(format) > 0 {40		check.printTrace(format, args)41	}42	check.pos = check.pos[:len(check.pos)-1]43}44func (check *checker) formatMsg(format string, args []interface{}) string {45	for i, arg := range args {46		switch a := arg.(type) {47		case token.Pos:48			args[i] = check.fset.Position(a).String()49		case ast.Expr:50			args[i] = exprString(a)51		case Type:52			args[i] = typeString(a)53		case operand:54			panic("internal error: should always pass *operand")55		}56	}57	return fmt.Sprintf(format, args...)58}59// dump is only needed for debugging60func (check *checker) dump(format string, args ...interface{}) {61	fmt.Println(check.formatMsg(format, args))62}63func (check *checker) err(err error) {64	if check.firsterr == nil {65		check.firsterr = err66	}67	f := check.ctxt.Error68	if f == nil {69		panic(bailout{}) // report only first error70	}71	f(err)72}73func (check *checker) errorf(pos token.Pos, format string, args ...interface{}) {74	check.err(fmt.Errorf("%s: %s", check.fset.Position(pos), check.formatMsg(format, args)))75}76func (check *checker) invalidAST(pos token.Pos, format string, args ...interface{}) {77	check.errorf(pos, "invalid AST: "+format, args...)78}79func (check *checker) invalidArg(pos token.Pos, format string, args ...interface{}) {80	check.errorf(pos, "invalid argument: "+format, args...)81}82func (check *checker) invalidOp(pos token.Pos, format string, args ...interface{}) {83	check.errorf(pos, "invalid operation: "+format, args...)84}85// exprString returns a (simplified) string representation for an expression.86func exprString(expr ast.Expr) string {87	var buf bytes.Buffer88	writeExpr(&buf, expr)89	return buf.String()90}91// TODO(gri) Need to merge with typeString since some expressions are types (try: ([]int)(a))92func writeExpr(buf *bytes.Buffer, expr ast.Expr) {93	switch x := expr.(type) {94	case *ast.Ident:95		buf.WriteString(x.Name)96	case *ast.BasicLit:97		buf.WriteString(x.Value)98	case *ast.FuncLit:99		buf.WriteString("(func literal)")100	case *ast.CompositeLit:101		buf.WriteString("(composite literal)")102	case *ast.ParenExpr:103		buf.WriteByte('(')104		writeExpr(buf, x.X)105		buf.WriteByte(')')106	case *ast.SelectorExpr:107		writeExpr(buf, x.X)108		buf.WriteByte('.')109		buf.WriteString(x.Sel.Name)110	case *ast.IndexExpr:111		writeExpr(buf, x.X)112		buf.WriteByte('[')113		writeExpr(buf, x.Index)114		buf.WriteByte(']')115	case *ast.SliceExpr:116		writeExpr(buf, x.X)117		buf.WriteByte('[')118		if x.Low != nil {119			writeExpr(buf, x.Low)120		}121		buf.WriteByte(':')122		if x.High != nil {123			writeExpr(buf, x.High)124		}125		buf.WriteByte(']')126	case *ast.TypeAssertExpr:127		writeExpr(buf, x.X)128		buf.WriteString(".(...)")129	case *ast.CallExpr:130		writeExpr(buf, x.Fun)131		buf.WriteByte('(')132		for i, arg := range x.Args {133			if i > 0 {134				buf.WriteString(", ")135			}136			writeExpr(buf, arg)137		}138		buf.WriteByte(')')139	case *ast.StarExpr:140		buf.WriteByte('*')141		writeExpr(buf, x.X)142	case *ast.UnaryExpr:143		buf.WriteString(x.Op.String())144		writeExpr(buf, x.X)145	case *ast.BinaryExpr:146		// The AST preserves source-level parentheses so there is147		// no need to introduce parentheses here for correctness.148		writeExpr(buf, x.X)149		buf.WriteByte(' ')150		buf.WriteString(x.Op.String())151		buf.WriteByte(' ')152		writeExpr(buf, x.Y)153	default:154		fmt.Fprintf(buf, "<expr %T>", x)155	}156}157// typeString returns a string representation for typ.158func typeString(typ Type) string {159	var buf bytes.Buffer160	writeType(&buf, typ)161	return buf.String()162}163func writeParams(buf *bytes.Buffer, params []*Var, isVariadic bool) {164	buf.WriteByte('(')165	for i, par := range params {166		if i > 0 {167			buf.WriteString(", ")168		}169		if par.Name != "" {170			buf.WriteString(par.Name)171			buf.WriteByte(' ')172		}173		if isVariadic && i == len(params)-1 {174			buf.WriteString("...")175		}176		writeType(buf, par.Type)177	}178	buf.WriteByte(')')179}180func writeSignature(buf *bytes.Buffer, sig *Signature) {181	writeParams(buf, sig.Params, sig.IsVariadic)182	if len(sig.Results) == 0 {183		// no result184		return185	}186	buf.WriteByte(' ')187	if len(sig.Results) == 1 && sig.Results[0].Name == "" {188		// single unnamed result189		writeType(buf, sig.Results[0].Type.(Type))190		return191	}192	// multiple or named result(s)193	writeParams(buf, sig.Results, false)194}195func writeType(buf *bytes.Buffer, typ Type) {196	switch t := typ.(type) {197	case nil:198		buf.WriteString("<nil>")199	case *Basic:200		buf.WriteString(t.Name)201	case *Array:202		fmt.Fprintf(buf, "[%d]", t.Len)203		writeType(buf, t.Elt)204	case *Slice:205		buf.WriteString("[]")206		writeType(buf, t.Elt)207	case *Struct:208		buf.WriteString("struct{")209		for i, f := range t.Fields {210			if i > 0 {211				buf.WriteString("; ")212			}213			if !f.IsAnonymous {214				buf.WriteString(f.Name)215				buf.WriteByte(' ')216			}217			writeType(buf, f.Type)218			if f.Tag != "" {219				fmt.Fprintf(buf, " %q", f.Tag)220			}221		}222		buf.WriteByte('}')223	case *Pointer:224		buf.WriteByte('*')225		writeType(buf, t.Base)226	case *Result:227		writeParams(buf, t.Values, false)228	case *Signature:229		buf.WriteString("func")230		writeSignature(buf, t)231	case *builtin:232		fmt.Fprintf(buf, "<type of %s>", t.name)233	case *Interface:234		buf.WriteString("interface{")235		for i, m := range t.Methods {236			if i > 0 {237				buf.WriteString("; ")238			}239			buf.WriteString(m.Name)240			writeSignature(buf, m.Type)241		}242		buf.WriteByte('}')243	case *Map:244		buf.WriteString("map[")245		writeType(buf, t.Key)246		buf.WriteByte(']')247		writeType(buf, t.Elt)248	case *Chan:249		var s string250		switch t.Dir {251		case ast.SEND:252			s = "chan<- "253		case ast.RECV:254			s = "<-chan "255		default:256			s = "chan "257		}258		buf.WriteString(s)259		writeType(buf, t.Elt)260	case *NamedType:261		s := "<NamedType w/o object>"262		if obj := t.Obj; obj != nil {263			if obj.Pkg != nil && obj.Pkg.Path != "" {264				buf.WriteString(obj.Pkg.Path)265				buf.WriteString(".")266			}267			s = t.Obj.GetName()268		}269		buf.WriteString(s)270	default:271		fmt.Fprintf(buf, "<type %T>", t)272	}273}274func (t *Array) String() string     { return typeString(t) }275func (t *Basic) String() string     { return typeString(t) }276func (t *Chan) String() string      { return typeString(t) }277func (t *Interface) String() string { return typeString(t) }278func (t *Map) String() string       { return typeString(t) }279func (t *NamedType) String() string { return typeString(t) }280func (t *Pointer) String() string   { return typeString(t) }281func (t *Result) String() string    { return typeString(t) }282func (t *Signature) String() string { return typeString(t) }283func (t *Slice) String() string     { return typeString(t) }284func (t *Struct) String() string    { return typeString(t) }285func (t *builtin) String() string   { return typeString(t) }...

source.go

Source:source.go

...12	"strings"13	"github.com/pkg/errors"14)15const baseStackIndex = 116// FormattedCallExprArg returns the argument from an ast.CallExpr at the17// index in the call stack. The argument is formatted using FormatNode.18func FormattedCallExprArg(stackIndex int, argPos int) (string, error) {19	args, err := CallExprArgs(stackIndex + 1)20	if err != nil {21		return "", err22	}23	if argPos >= len(args) {24		return "", errors.New("failed to find expression")25	}26	return FormatNode(args[argPos])27}28// CallExprArgs returns the ast.Expr slice for the args of an ast.CallExpr at29// the index in the call stack.30func CallExprArgs(stackIndex int) ([]ast.Expr, error) {31	_, filename, lineNum, ok := runtime.Caller(baseStackIndex + stackIndex)32	if !ok {33		return nil, errors.New("failed to get call stack")34	}35	debug("call stack position: %s:%d", filename, lineNum)36	node, err := getNodeAtLine(filename, lineNum)37	if err != nil {38		return nil, err39	}40	debug("found node: %s", debugFormatNode{node})41	return getCallExprArgs(node)42}43func getNodeAtLine(filename string, lineNum int) (ast.Node, error) {44	fileset := token.NewFileSet()45	astFile, err := parser.ParseFile(fileset, filename, nil, parser.AllErrors)46	if err != nil {47		return nil, errors.Wrapf(err, "failed to parse source file: %s", filename)48	}49	if node := scanToLine(fileset, astFile, lineNum); node != nil {50		return node, nil51	}52	if node := scanToDeferLine(fileset, astFile, lineNum); node != nil {53		node, err := guessDefer(node)54		if err != nil || node != nil {55			return node, err56		}57	}58	return nil, errors.Errorf(59		"failed to find an expression on line %d in %s", lineNum, filename)60}61func scanToLine(fileset *token.FileSet, node ast.Node, lineNum int) ast.Node {62	var matchedNode ast.Node63	ast.Inspect(node, func(node ast.Node) bool {64		switch {65		case node == nil || matchedNode != nil:66			return false67		case nodePosition(fileset, node).Line == lineNum:68			matchedNode = node69			return false70		}71		return true72	})73	return matchedNode74}75// In golang 1.9 the line number changed from being the line where the statement76// ended to the line where the statement began.77func nodePosition(fileset *token.FileSet, node ast.Node) token.Position {78	if goVersionBefore19 {79		return fileset.Position(node.End())80	}81	return fileset.Position(node.Pos())82}83var goVersionBefore19 = func() bool {84	version := runtime.Version()85	// not a release version86	if !strings.HasPrefix(version, "go") {87		return false88	}89	version = strings.TrimPrefix(version, "go")90	parts := strings.Split(version, ".")91	if len(parts) < 2 {92		return false93	}94	minor, err := strconv.ParseInt(parts[1], 10, 32)95	return err == nil && parts[0] == "1" && minor < 996}()97func getCallExprArgs(node ast.Node) ([]ast.Expr, error) {98	visitor := &callExprVisitor{}99	ast.Walk(visitor, node)100	if visitor.expr == nil {101		return nil, errors.New("failed to find call expression")102	}103	debug("callExpr: %s", debugFormatNode{visitor.expr})104	return visitor.expr.Args, nil105}106type callExprVisitor struct {107	expr *ast.CallExpr108}109func (v *callExprVisitor) Visit(node ast.Node) ast.Visitor {110	if v.expr != nil || node == nil {111		return nil112	}113	debug("visit: %s", debugFormatNode{node})114	switch typed := node.(type) {115	case *ast.CallExpr:116		v.expr = typed117		return nil118	case *ast.DeferStmt:119		ast.Walk(v, typed.Call.Fun)120		return nil121	}122	return v123}124// FormatNode using go/format.Node and return the result as a string125func FormatNode(node ast.Node) (string, error) {126	buf := new(bytes.Buffer)127	err := format.Node(buf, token.NewFileSet(), node)128	return buf.String(), err129}130var debugEnabled = os.Getenv("GOTESTTOOLS_DEBUG") != ""131func debug(format string, args ...interface{}) {132	if debugEnabled {133		fmt.Fprintf(os.Stderr, "DEBUG: "+format+"\n", args...)134	}135}136type debugFormatNode struct {137	ast.Node138}139func (n debugFormatNode) String() string {140	out, err := FormatNode(n.Node)141	if err != nil {142		return fmt.Sprintf("failed to format %s: %s", n.Node, err)143	}144	return fmt.Sprintf("(%T) %s", n.Node, out)145}...

Format

Using AI Code Generation

1import (2func main() {3	import "fmt"4	func main() {5		fmt.Println("Hello, world!")6	}`7	f, err := parser.ParseFile(fset, "", src, 0)8	if err != nil {9		fmt.Println(err)10	}11	ast.Print(fset, f)12}13import (14func main() {15	import "fmt"16	func main() {17		fmt.Println("Hello, world!")18	}`19	f, err := parser.ParseFile(fset, "", src, 0)20	if err != nil {21		fmt.Println(err)22	}23	ast.Print(fset, f)24}25import (26func main() {27	import "fmt"28	func main() {29		fmt.Println("Hello, world!")30	}`31	f, err := parser.ParseFile(fset, "", src, 0)32	if err != nil {33		fmt.Println(err)34	}35	ast.Print(fset, f)36}37import (38func main() {39	import "fmt"40	func main() {41		fmt.Println("Hello, world!")42	}`43	f, err := parser.ParseFile(fset, "", src, 0)44	if err != nil {

Format

Using AI Code Generation

1import "fmt"2func main() {3    fmt.Printf("%s", "Hello World")4}5import "fmt"6func main() {7    fmt.Printf("%s", "Hello World")8}9import "fmt"10func main() {11    fmt.Printf("%s", "Hello World")12}13import "fmt"14func main() {15    fmt.Printf("%s", "Hello World")16}17import "fmt"18func main() {19    fmt.Printf("%s", "Hello World")20}21import "fmt"22func main() {23    fmt.Printf("%s", "Hello World")24}25import "fmt"26func main() {27    fmt.Printf("%s", "Hello World")28}29import "fmt"30func main() {31    fmt.Printf("%s", "Hello World")32}33import "fmt"34func main() {35    fmt.Printf("%s", "Hello World")36}37import "fmt"38func main() {39    fmt.Printf("%s", "Hello World")40}41import "fmt"42func main() {43    fmt.Printf("%s", "Hello World")44}45import "fmt"46func main() {47    fmt.Printf("%s", "Hello World")48}49import "fmt"50func main() {51    fmt.Printf("%s", "Hello World")52}53import "fmt"54func main() {55    fmt.Printf("%s", "Hello World")56}

Format

Using AI Code Generation

1import (2func main() {3	file := &ast.File{}4	funcDecl := &ast.FuncDecl{}5	ident := &ast.Ident{}6	file.Decls = append(file.Decls, funcDecl)7	fieldList := &ast.FieldList{}8	field := &ast.Field{}9	fieldList.List = append(fieldList.List, field)10	ident = &ast.Ident{}11	ident = &ast.Ident{}12	importSpec := &ast.ImportSpec{}13	importSpec.Path = ident14	genDecl := &ast.GenDecl{}15	genDecl.Specs = append(genDecl.Specs, importSpec)16	file.Imports = append(file.Imports, genDecl)17	blockStmt := &ast.BlockStmt{}18	exprStmt := &ast.ExprStmt{}19	blockStmt.List = append(blockStmt.List, exprStmt)

Format

Using AI Code Generation

1import (2func main() {3	node := ast.NewIdent("Ident")4	fmt.Println(node)5}6import (7func main() {8	node := ast.NewIdent("Ident")9	fmt.Println(node.Format(nil))10}11import (12func main() {13	node := ast.NewIdent("Ident")14	fmt.Println(node.Format(nil))15}16import (17func main() {18	node := ast.NewIdent("Ident")19	fmt.Println(node.Format(&ast.Comments{}))20}21import (22func main() {23	node := ast.NewIdent("Ident")24	fmt.Println(node.Format(&ast.Comments{List: []*ast.CommentGroup{}}))25}26import (27func main() {28	node := ast.NewIdent("Ident")29	fmt.Println(node.Format(&ast.Comments{List: []*ast.CommentGroup{&ast.CommentGroup{}}}))30}31import (32func main() {

Automation Testing Tutorials

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