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How to use Count method of ast Package

Best Syzkaller code snippet using ast.Count

compile.go

Source:compile.go

...82	return c83}84type compiler struct {85	Config86	upCountOffset int32 // 1 for files; 0 for expressions87	index adt.StringIndexer88	stack      []frame89	inSelector int90	fileScope map[adt.Feature]bool91	num literal.NumInfo92	errs errors.Error93}94func (c *compiler) reset() {95	c.fileScope = nil96	c.stack = c.stack[:0]97	c.errs = nil98}99func (c *compiler) errf(n ast.Node, format string, args ...interface{}) *adt.Bottom {100	err := &compilerError{101		n:       n,102		path:    c.path(),103		Message: errors.NewMessage(format, args),104	}105	c.errs = errors.Append(c.errs, err)106	return &adt.Bottom{Err: err}107}108func (c *compiler) path() []string {109	a := []string{}110	for _, f := range c.stack {111		if f.label != nil {112			a = append(a, f.label.labelString())113		}114	}115	return a116}117type frame struct {118	label labeler  // path name leading to this frame.119	scope ast.Node // *ast.File or *ast.Struct120	field *ast.Field121	// scope   map[ast.Node]bool122	upCount int32 // 1 for field, 0 for embedding.123	aliases map[string]aliasEntry124}125type aliasEntry struct {126	label   labeler127	srcExpr ast.Expr128	expr    adt.Expr129	source  ast.Node130	used    bool131}132func (c *compiler) insertAlias(id *ast.Ident, a aliasEntry) *adt.Bottom {133	k := len(c.stack) - 1134	m := c.stack[k].aliases135	if m == nil {136		m = map[string]aliasEntry{}137		c.stack[k].aliases = m138	}139	if id == nil || !ast.IsValidIdent(id.Name) {140		return c.errf(a.source, "invalid identifier name")141	}142	if e, ok := m[id.Name]; ok {143		return c.errf(a.source,144			"alias %q already declared; previous declaration at %s",145			id.Name, e.source.Pos())146	}147	m[id.Name] = a148	return nil149}150func (c *compiler) updateAlias(id *ast.Ident, expr adt.Expr) {151	k := len(c.stack) - 1152	m := c.stack[k].aliases153	x := m[id.Name]154	x.expr = expr155	x.label = nil156	x.srcExpr = nil157	m[id.Name] = x158}159// lookupAlias looks up an alias with the given name at the k'th stack position.160func (c compiler) lookupAlias(k int, id *ast.Ident) aliasEntry {161	m := c.stack[k].aliases162	name := id.Name163	entry, ok := m[name]164	if !ok {165		err := c.errf(id, "could not find LetClause associated with identifier %q", name)166		return aliasEntry{expr: err}167	}168	switch {169	case entry.label != nil:170		if entry.srcExpr == nil {171			entry.expr = c.errf(id, "cyclic references in let clause or alias")172			break173		}174		src := entry.srcExpr175		entry.srcExpr = nil // mark to allow detecting cycles176		m[name] = entry177		entry.expr = c.labeledExprAt(k, nil, entry.label, src)178		entry.label = nil179	}180	entry.used = true181	m[name] = entry182	return entry183}184func (c *compiler) pushScope(n labeler, upCount int32, id ast.Node) *frame {185	c.stack = append(c.stack, frame{186		label:   n,187		scope:   id,188		upCount: upCount,189	})190	return &c.stack[len(c.stack)-1]191}192func (c *compiler) popScope() {193	k := len(c.stack) - 1194	f := c.stack[k]195	for k, v := range f.aliases {196		if !v.used {197			c.errf(v.source, "unreferenced alias or let clause %s", k)198		}199	}200	c.stack = c.stack[:k]201}202func (c *compiler) compileFiles(a []*ast.File) *adt.Vertex { // Or value?203	c.fileScope = map[adt.Feature]bool{}204	c.upCountOffset = 1205	// TODO(resolve): this is also done in the runtime package, do we need both?206	// Populate file scope to handle unresolved references.207	// Excluded from cross-file resolution are:208	// - import specs209	// - aliases210	// - anything in an anonymous file211	//212	for _, f := range a {213		if p := internal.GetPackageInfo(f); p.IsAnonymous() {214			continue215		}216		for _, d := range f.Decls {217			if f, ok := d.(*ast.Field); ok {218				if id, ok := f.Label.(*ast.Ident); ok {219					c.fileScope[c.label(id)] = true220				}221			}222		}223	}224	// TODO: set doc.225	res := &adt.Vertex{}226	// env := &adt.Environment{Vertex: nil} // runtime: c.runtime227	env := &adt.Environment{}228	top := env229	for p := c.Config.Scope; p != nil; p = p.Parent() {230		top.Vertex = p.Vertex()231		top.Up = &adt.Environment{}232		top = top.Up233	}234	for _, file := range a {235		c.pushScope(nil, 0, file) // File scope236		v := &adt.StructLit{Src: file}237		c.addDecls(v, file.Decls)238		res.Conjuncts = append(res.Conjuncts, adt.MakeRootConjunct(env, v))239		c.popScope()240	}241	return res242}243func (c *compiler) compileExpr(x ast.Expr) adt.Conjunct {244	expr := c.expr(x)245	env := &adt.Environment{}246	top := env247	for p := c.Config.Scope; p != nil; p = p.Parent() {248		top.Vertex = p.Vertex()249		top.Up = &adt.Environment{}250		top = top.Up251	}252	return adt.MakeRootConjunct(env, expr)253}254// resolve assumes that all existing resolutions are legal. Validation should255// be done in a separate step if required.256//257// TODO: collect validation pass to verify that all resolutions are258// legal?259func (c *compiler) resolve(n *ast.Ident) adt.Expr {260	// X in import "path/X"261	// X in import X "path"262	if imp, ok := n.Node.(*ast.ImportSpec); ok {263		return &adt.ImportReference{264			Src:        n,265			ImportPath: c.label(imp.Path),266			Label:      c.label(n),267		}268	}269	label := c.label(n)270	// Unresolved field.271	if n.Node == nil {272		upCount := int32(0)273		for _, c := range c.stack {274			upCount += c.upCount275		}276		if c.fileScope[label] {277			return &adt.FieldReference{278				Src:     n,279				UpCount: upCount,280				Label:   label,281			}282		}283		upCount += c.upCountOffset284		for p := c.Scope; p != nil; p = p.Parent() {285			for _, a := range p.Vertex().Arcs {286				if a.Label == label {287					return &adt.FieldReference{288						Src:     n,289						UpCount: upCount,290						Label:   label,291					}292				}293			}294			upCount++295		}296		if c.Config.Imports != nil {297			if pkgPath := c.Config.Imports(n); pkgPath != "" {298				return &adt.ImportReference{299					Src:        n,300					ImportPath: adt.MakeStringLabel(c.index, pkgPath),301					Label:      c.label(n),302				}303			}304		}305		if p := predeclared(n); p != nil {306			return p307		}308		return c.errf(n, "reference %q not found", n.Name)309	}310	//   X in [X=x]: y  Scope: Field  Node: Expr (x)311	//   X in X=[x]: y  Scope: Field  Node: Field312	//   X in x: X=y    Scope: Field  Node: Alias313	if f, ok := n.Scope.(*ast.Field); ok {314		upCount := int32(0)315		k := len(c.stack) - 1316		for ; k >= 0; k-- {317			if c.stack[k].field == f {318				break319			}320			upCount += c.stack[k].upCount321		}322		label := &adt.LabelReference{323			Src:     n,324			UpCount: upCount,325		}326		switch f := n.Node.(type) {327		case *ast.Field:328			_ = c.lookupAlias(k, f.Label.(*ast.Alias).Ident) // mark as used329			return &adt.DynamicReference{330				Src:     n,331				UpCount: upCount,332				Label:   label,333			}334		case *ast.Alias:335			_ = c.lookupAlias(k, f.Ident) // mark as used336			return &adt.ValueReference{337				Src:     n,338				UpCount: upCount,339				Label:   c.label(f.Ident),340			}341		}342		return label343	}344	upCount := int32(0)345	k := len(c.stack) - 1346	for ; k >= 0; k-- {347		if c.stack[k].scope == n.Scope {348			break349		}350		upCount += c.stack[k].upCount351	}352	if k < 0 {353		// This is a programmatic error and should never happen if the users354		// just builds with the cue command or if astutil.Resolve is used355		// correctly.356		c.errf(n, "reference %q set to unknown node in AST; "+357			"this can result from incorrect API usage or a compiler bug",358			n.Name)359	}360	if n.Scope == nil {361		// Package.362		// Should have been handled above.363		return c.errf(n, "unresolved identifier %v", n.Name)364	}365	switch f := n.Node.(type) {366	// Local expressions367	case *ast.LetClause:368		entry := c.lookupAlias(k, n)369		// let x = y370		return &adt.LetReference{371			Src:     n,372			UpCount: upCount,373			Label:   label,374			X:       entry.expr,375		}376	// TODO: handle new-style aliases377	case *ast.Field:378		// X=x: y379		// X=(x): y380		// X="\(x)": y381		a, ok := f.Label.(*ast.Alias)382		if !ok {383			return c.errf(n, "illegal reference %s", n.Name)384		}385		aliasInfo := c.lookupAlias(k, a.Ident) // marks alias as used.386		lab, ok := a.Expr.(ast.Label)387		if !ok {388			return c.errf(a.Expr, "invalid label expression")389		}390		name, _, err := ast.LabelName(lab)391		switch {392		case errors.Is(err, ast.ErrIsExpression):393			if aliasInfo.expr == nil {394				panic("unreachable")395			}396			return &adt.DynamicReference{397				Src:     n,398				UpCount: upCount,399				Label:   aliasInfo.expr,400			}401		case err != nil:402			return c.errf(n, "invalid label: %v", err)403		case name != "":404			label = c.label(lab)405		default:406			return c.errf(n, "unsupported field alias %q", name)407		}408	}409	return &adt.FieldReference{410		Src:     n,411		UpCount: upCount,412		Label:   label,413	}414}415func (c *compiler) addDecls(st *adt.StructLit, a []ast.Decl) {416	for _, d := range a {417		c.markAlias(d)418	}419	for _, d := range a {420		c.addLetDecl(d)421	}422	for _, d := range a {423		if x := c.decl(d); x != nil {424			st.Decls = append(st.Decls, x)425		}...

func_count_test.go

Source:func_count_test.go

...20	"github.com/pingcap/parser/mysql"21	"github.com/pingcap/tidb/executor/aggfuncs"22)23func genApproxDistinctMergePartialResult(begin, end uint64) string {24	o := aggfuncs.NewPartialResult4ApproxCountDistinct()25	encodedBytes := make([]byte, 8)26	for i := begin; i < end; i++ {27		binary.LittleEndian.PutUint64(encodedBytes, i)28		x := farm.Hash64(encodedBytes)29		o.InsertHash64(x)30	}31	return string(o.Serialize())32}33func (s *testSuite) TestMergePartialResult4Count(c *C) {34	tester := buildAggTester(ast.AggFuncCount, mysql.TypeLonglong, 5, 5, 3, 8)35	s.testMergePartialResult(c, tester)36	tester = buildAggTester(ast.AggFuncApproxCountDistinct, mysql.TypeLonglong, 5, genApproxDistinctMergePartialResult(0, 5), genApproxDistinctMergePartialResult(2, 5), 5)37	s.testMergePartialResult(c, tester)38}39func (s *testSuite) TestCount(c *C) {40	tests := []aggTest{41		buildAggTester(ast.AggFuncCount, mysql.TypeLonglong, 5, 0, 5),42		buildAggTester(ast.AggFuncCount, mysql.TypeFloat, 5, 0, 5),43		buildAggTester(ast.AggFuncCount, mysql.TypeDouble, 5, 0, 5),44		buildAggTester(ast.AggFuncCount, mysql.TypeNewDecimal, 5, 0, 5),45		buildAggTester(ast.AggFuncCount, mysql.TypeString, 5, 0, 5),46		buildAggTester(ast.AggFuncCount, mysql.TypeDate, 5, 0, 5),47		buildAggTester(ast.AggFuncCount, mysql.TypeDuration, 5, 0, 5),48		buildAggTester(ast.AggFuncCount, mysql.TypeJSON, 5, 0, 5),49	}50	for _, test := range tests {51		s.testAggFunc(c, test)52	}53	tests2 := []multiArgsAggTest{54		buildMultiArgsAggTester(ast.AggFuncCount, []byte{mysql.TypeLonglong, mysql.TypeLonglong}, mysql.TypeLonglong, 5, 0, 5),55		buildMultiArgsAggTester(ast.AggFuncCount, []byte{mysql.TypeFloat, mysql.TypeFloat}, mysql.TypeLonglong, 5, 0, 5),56		buildMultiArgsAggTester(ast.AggFuncCount, []byte{mysql.TypeDouble, mysql.TypeDouble}, mysql.TypeLonglong, 5, 0, 5),57		buildMultiArgsAggTester(ast.AggFuncCount, []byte{mysql.TypeNewDecimal, mysql.TypeNewDecimal}, mysql.TypeLonglong, 5, 0, 5),58		buildMultiArgsAggTester(ast.AggFuncCount, []byte{mysql.TypeString, mysql.TypeString}, mysql.TypeLonglong, 5, 0, 5),59		buildMultiArgsAggTester(ast.AggFuncCount, []byte{mysql.TypeDate, mysql.TypeDate}, mysql.TypeLonglong, 5, 0, 5),60		buildMultiArgsAggTester(ast.AggFuncCount, []byte{mysql.TypeDuration, mysql.TypeDuration}, mysql.TypeLonglong, 5, 0, 5),61		buildMultiArgsAggTester(ast.AggFuncCount, []byte{mysql.TypeJSON, mysql.TypeJSON}, mysql.TypeLonglong, 5, 0, 5),62	}63	for _, test := range tests2 {64		s.testMultiArgsAggFunc(c, test)65	}66	tests3 := []aggTest{67		buildAggTester(ast.AggFuncCount, mysql.TypeLonglong, 5, 0, 5),68		buildAggTester(ast.AggFuncCount, mysql.TypeFloat, 5, 0, 5),69		buildAggTester(ast.AggFuncCount, mysql.TypeDouble, 5, 0, 5),70		buildAggTester(ast.AggFuncCount, mysql.TypeNewDecimal, 5, 0, 5),71		buildAggTester(ast.AggFuncCount, mysql.TypeString, 5, 0, 5),72		buildAggTester(ast.AggFuncCount, mysql.TypeDate, 5, 0, 5),73		buildAggTester(ast.AggFuncCount, mysql.TypeDuration, 5, 0, 5),74		buildAggTester(ast.AggFuncCount, mysql.TypeJSON, 5, 0, 5),75	}76	for _, test := range tests3 {77		s.testAggFunc(c, test)78	}79	tests4 := []multiArgsAggTest{80		buildMultiArgsAggTester(ast.AggFuncApproxCountDistinct, []byte{mysql.TypeLonglong, mysql.TypeLonglong}, mysql.TypeLonglong, 5, 0, 5),81		buildMultiArgsAggTester(ast.AggFuncApproxCountDistinct, []byte{mysql.TypeFloat, mysql.TypeFloat}, mysql.TypeLonglong, 5, 0, 5),82		buildMultiArgsAggTester(ast.AggFuncApproxCountDistinct, []byte{mysql.TypeDouble, mysql.TypeDouble}, mysql.TypeLonglong, 5, 0, 5),83		buildMultiArgsAggTester(ast.AggFuncApproxCountDistinct, []byte{mysql.TypeNewDecimal, mysql.TypeNewDecimal}, mysql.TypeLonglong, 5, 0, 5),84		buildMultiArgsAggTester(ast.AggFuncApproxCountDistinct, []byte{mysql.TypeString, mysql.TypeString}, mysql.TypeLonglong, 5, 0, 5),85		buildMultiArgsAggTester(ast.AggFuncApproxCountDistinct, []byte{mysql.TypeDate, mysql.TypeDate}, mysql.TypeLonglong, 5, 0, 5),86		buildMultiArgsAggTester(ast.AggFuncApproxCountDistinct, []byte{mysql.TypeDuration, mysql.TypeDuration}, mysql.TypeLonglong, 5, 0, 5),87		buildMultiArgsAggTester(ast.AggFuncApproxCountDistinct, []byte{mysql.TypeJSON, mysql.TypeJSON}, mysql.TypeLonglong, 5, 0, 5),88	}89	for _, test := range tests4 {90		s.testMultiArgsAggFunc(c, test)91	}92}93func BenchmarkCount(b *testing.B) {94	s := testSuite{}95	s.SetUpSuite(nil)96	rowNum := 5000097	tests := []aggTest{98		buildAggTester(ast.AggFuncCount, mysql.TypeLonglong, rowNum, 0, rowNum),99		buildAggTester(ast.AggFuncCount, mysql.TypeFloat, rowNum, 0, rowNum),100		buildAggTester(ast.AggFuncCount, mysql.TypeDouble, rowNum, 0, rowNum),101		buildAggTester(ast.AggFuncCount, mysql.TypeNewDecimal, rowNum, 0, rowNum),102		buildAggTester(ast.AggFuncCount, mysql.TypeString, rowNum, 0, rowNum),103		buildAggTester(ast.AggFuncCount, mysql.TypeDate, rowNum, 0, rowNum),104		buildAggTester(ast.AggFuncCount, mysql.TypeDuration, rowNum, 0, rowNum),105		buildAggTester(ast.AggFuncCount, mysql.TypeJSON, rowNum, 0, rowNum),106	}107	for _, test := range tests {108		s.benchmarkAggFunc(b, test)109	}110	tests2 := []multiArgsAggTest{111		buildMultiArgsAggTester(ast.AggFuncCount, []byte{mysql.TypeLonglong, mysql.TypeLonglong}, mysql.TypeLonglong, rowNum, 0, rowNum),112		buildMultiArgsAggTester(ast.AggFuncCount, []byte{mysql.TypeFloat, mysql.TypeFloat}, mysql.TypeLonglong, rowNum, 0, rowNum),113		buildMultiArgsAggTester(ast.AggFuncCount, []byte{mysql.TypeDouble, mysql.TypeDouble}, mysql.TypeLonglong, rowNum, 0, rowNum),114		buildMultiArgsAggTester(ast.AggFuncCount, []byte{mysql.TypeNewDecimal, mysql.TypeNewDecimal}, mysql.TypeLonglong, rowNum, 0, rowNum),115		buildMultiArgsAggTester(ast.AggFuncCount, []byte{mysql.TypeString, mysql.TypeString}, mysql.TypeLonglong, rowNum, 0, rowNum),116		buildMultiArgsAggTester(ast.AggFuncCount, []byte{mysql.TypeDate, mysql.TypeDate}, mysql.TypeLonglong, rowNum, 0, rowNum),117		buildMultiArgsAggTester(ast.AggFuncCount, []byte{mysql.TypeDuration, mysql.TypeDuration}, mysql.TypeLonglong, rowNum, 0, rowNum),118		buildMultiArgsAggTester(ast.AggFuncCount, []byte{mysql.TypeJSON, mysql.TypeJSON}, mysql.TypeLonglong, rowNum, 0, rowNum),119	}120	for _, test := range tests2 {121		s.benchmarkMultiArgsAggFunc(b, test)122	}123	tests3 := []multiArgsAggTest{124		buildMultiArgsAggTester(ast.AggFuncApproxCountDistinct, []byte{mysql.TypeLonglong, mysql.TypeLonglong}, mysql.TypeLonglong, rowNum, 0, rowNum),125		buildMultiArgsAggTester(ast.AggFuncApproxCountDistinct, []byte{mysql.TypeFloat, mysql.TypeFloat}, mysql.TypeLonglong, rowNum, 0, rowNum),126		buildMultiArgsAggTester(ast.AggFuncApproxCountDistinct, []byte{mysql.TypeDouble, mysql.TypeDouble}, mysql.TypeLonglong, rowNum, 0, rowNum),127		buildMultiArgsAggTester(ast.AggFuncApproxCountDistinct, []byte{mysql.TypeNewDecimal, mysql.TypeNewDecimal}, mysql.TypeLonglong, rowNum, 0, rowNum),128		buildMultiArgsAggTester(ast.AggFuncApproxCountDistinct, []byte{mysql.TypeString, mysql.TypeString}, mysql.TypeLonglong, rowNum, 0, rowNum),129		buildMultiArgsAggTester(ast.AggFuncApproxCountDistinct, []byte{mysql.TypeDate, mysql.TypeDate}, mysql.TypeLonglong, rowNum, 0, rowNum),130		buildMultiArgsAggTester(ast.AggFuncApproxCountDistinct, []byte{mysql.TypeDuration, mysql.TypeDuration}, mysql.TypeLonglong, rowNum, 0, rowNum),131		buildMultiArgsAggTester(ast.AggFuncApproxCountDistinct, []byte{mysql.TypeJSON, mysql.TypeJSON}, mysql.TypeLonglong, rowNum, 0, rowNum),132	}133	for _, test := range tests3 {134		s.benchmarkMultiArgsAggFunc(b, test)135	}136}...

dive.go

Source:dive.go

1package dive2import (3	"go/ast"4	"golang.org/x/tools/go/analysis"5	"golang.org/x/tools/go/analysis/passes/inspect"6	"golang.org/x/tools/go/ast/inspector"7)8const doc = "dive finds low readability if-blocks"9var Analyzer = &analysis.Analyzer{10	Name: "dive",11	Doc:  doc,12	Run:  run,13	Requires: []*analysis.Analyzer{14		inspect.Analyzer,15	},16}17var (18	flagBlockLength int19	flagReturns     int20	flagDepthNest   int21)22func init() {23	Analyzer.Flags.IntVar(&flagBlockLength, "len", 5, "max length of if block")24	Analyzer.Flags.IntVar(&flagReturns, "ret", 2, "max number of returns in a if block")25	Analyzer.Flags.IntVar(&flagDepthNest, "nest", 2, "max depth of nest")26}27func run(pass *analysis.Pass) (interface{}, error) {28	inspect := pass.ResultOf[inspect.Analyzer].(*inspector.Inspector)29	nodeFilter := []ast.Node{30		(*ast.FuncDecl)(nil),31		(*ast.FuncLit)(nil),32	}33	inspect.Preorder(nodeFilter, func(n ast.Node) {34		switch n := n.(type) {35		case *ast.FuncDecl:36			checkTopBlock(pass, n.Body)37		case *ast.FuncLit:38			checkTopBlock(pass, n.Body)39		}40	})41	return nil, nil42}43func checkTopBlock(pass *analysis.Pass, body *ast.BlockStmt) {44	if body == nil {45		return46	}47	for _, stmt := range body.List {48		switch stmt := stmt.(type) {49		case *ast.IfStmt:50			checkIf(pass, stmt)51		}52	}53}54func checkIf(pass *analysis.Pass, ifstmt *ast.IfStmt) {55	checkBlock(pass, ifstmt.Body)56	switch elsestmt := ifstmt.Else.(type) {57	case *ast.BlockStmt:58		checkBlock(pass, elsestmt)59	case *ast.IfStmt:60		checkIf(pass, elsestmt)61	}62}63func checkBlock(pass *analysis.Pass, body *ast.BlockStmt) {64	if body == nil || len(body.List) == 0 {65		return66	}67	checkLongBlock(pass, body)68	checkManyReturns(pass, body)69	checkHasLoop(pass, body)70	checkDeeplyNest(pass, body)71}72func checkLongBlock(pass *analysis.Pass, body *ast.BlockStmt) {73	if body != nil && len(body.List) > flagBlockLength {74		pass.Reportf(body.Pos(), "too long block")75	}76}77func countLength(body *ast.BlockStmt) int {78	if body == nil {79		return 080	}81	var count int82	for _, stmt := range body.List {83		switch stmt := stmt.(type) {84		case *ast.ForStmt:85			count += 1 + countLength(stmt.Body)86		case *ast.IfStmt:87			count += 1 + countLength(stmt.Body)88		case *ast.SwitchStmt:89			count += 1 + countLength(stmt.Body)90		case *ast.TypeSwitchStmt:91			count += 1 + countLength(stmt.Body)92		case *ast.SelectStmt:93			count += 1 + countLength(stmt.Body)94		default:95			count++96		}97	}98	return count99}100func checkManyReturns(pass *analysis.Pass, body *ast.BlockStmt) {101	var count int102	ast.Inspect(body, func(n ast.Node) bool {103		switch n.(type) {104		case *ast.FuncLit, *ast.SelectStmt, *ast.SwitchStmt, *ast.TypeSwitchStmt:105			return false106		case *ast.ReturnStmt:107			count++108		}109		return true110	})111	if count > flagReturns {112		pass.Reportf(body.Pos(), "too many returns in the block")113	}114}115func checkHasLoop(pass *analysis.Pass, body *ast.BlockStmt) {116	ast.Inspect(body, func(n ast.Node) bool {117		switch n.(type) {118		case *ast.FuncLit:119			return false120		case *ast.ForStmt:121			pass.Reportf(body.Pos(), "loop in if block")122		}123		return true124	})125}126func checkDeeplyNest(pass *analysis.Pass, body *ast.BlockStmt) {127	if 1+countDepth(body) > flagDepthNest {128		pass.Reportf(body.Pos(), "too deeply nest")129	}130}131func countDepth(body *ast.BlockStmt) int {132	if body == nil {133		return 0134	}135	for _, stmt := range body.List {136		switch stmt := stmt.(type) {137		case *ast.ForStmt:138			return 1 + countDepth(stmt.Body)139		case *ast.IfStmt:140			return 1 + countDepth(stmt.Body)141		case *ast.SwitchStmt:142			return 1 + countDepth(stmt.Body)143		case *ast.TypeSwitchStmt:144			return 1 + countDepth(stmt.Body)145		case *ast.SelectStmt:146			return 1 + countDepth(stmt.Body)147		}148	}149	return 0150}...

Count

Using AI Code Generation

1import (2func main() {3	f, err := parser.ParseFile(fset, "C:/Users/HP/go/src/ast/1.go", nil, 0)4	if err != nil {5		fmt.Println(err)6	}7	ast.Print(fset, f)8	fmt.Println("Number of declarations:", f.Decls.Count())9}10Recommended Posts: Go | ast.FieldList.Count() method11Go | ast.FieldList.Len() method12Go | ast.FieldList.NumFields() method13Go | ast.FieldList.Append() method14Go | ast.FieldList.Set() method15Go | ast.FieldList.Filter() method16Go | ast.FieldList.Elem() method17Go | ast.FieldList.First() method18Go | ast.FieldList.Last() method19Go | ast.FieldList.List() method20Go | ast.FieldList.Pos() method21Go | ast.FieldList.End() method22Go | ast.FieldList.SetPos() method23Go | ast.FieldList.SetEnd() method24Go | ast.FieldList.SetList() method25Go | ast.FieldList.Add() method26Go | ast.FieldList.Get() method27Go | ast.FieldList.Remove() method28Go | ast.FieldList.InsertBefore() method29Go | ast.FieldList.InsertAfter() method30Go | ast.File.Name() method31Go | ast.File.Decls() method32Go | ast.File.Scope() method33Go | ast.File.Imports() method34Go | ast.File.Unresolved() method35Go | ast.File.Comments() method36Go | ast.File.AddDecl() method37Go | ast.File.AddImport() method38Go | ast.File.AddComment() method39Go | ast.File.RemoveDecl() method40Go | ast.File.RemoveImport() method41Go | ast.File.RemoveComment() method42Go | ast.File.Package() method43Go | ast.File.SetPackage() method44Go | ast.File.Pos() method

Count

Using AI Code Generation

1import (2func main() {3	f, err := parser.ParseFile(fset, "test.go", nil, parser.ParseComments)4	if err != nil {5		fmt.Println(err)6	}7	fmt.Println(fset)8	fmt.Println(f)9	fmt.Println(f.Name)10	fmt.Println("Imports:")11	for _, s := range f.Imports {12		fmt.Println(s.Path.Value)13	}14	fmt.Println("Comments:")15	for _, c := range f.Comments {16		fmt.Println(c.Text())17	}18	fmt.Println("Identifiers and literals:")19	ast.Inspect(f, func(n ast.Node) bool {20		switch x := n.(type) {21			fmt.Println(x.Name)22			fmt.Println(x.Value)23		}24	})25	fmt.Println("Function declarations:")26	ast.Inspect(f, func(n ast.Node) bool {27		switch x := n.(type) {28			fmt.Println(x.Name.Name)29		}30	})31	fmt.Println("Function declarations:")32	ast.Inspect(f, func(n ast.Node) bool {33		switch x := n.(type) {34			fmt.Println(x.Name.Name)35		}36	})37	fmt.Println("Function declarations:")38	ast.Inspect(f, func(n ast.Node) bool {39		switch x := n.(type) {40			fmt.Println(x.Name.Name)41		}42	})43	fmt.Println("Function declarations:")44	ast.Inspect(f, func(n ast.Node) bool {45		switch x := n.(type) {46			fmt.Println(x.Name.Name)47		}48	})49	fmt.Println("Function declarations:")50	ast.Inspect(f, func(n ast.Node) bool {

Count

Using AI Code Generation

1import (2func main() {3	f, err := parser.ParseFile(fset, "1.go", nil, parser.ParseComments)4	if err != nil {5		panic(err)6	}7	ast.Inspect(f, func(n ast.Node) bool {8		switch x := n.(type) {9			fmt.Println(x.Name)10			fmt.Println(x.Elts)11			fmt.Println(x.Name)12			fmt.Println(x.Fun)13			fmt.Println(x.Value)14			fmt.Println(x.Op)15			fmt.Println(x.Tok)16			fmt.Println(x.Tok)17			fmt.Println(x.X)18		}19	})20}211.go:6:2: expected declaration, found 'IDENT' import221.go:7:3: expected ';', found 'IDENT' "fmt"231.go:8:3: expected ';', found 'IDENT' "go"241.go:8:7: expected ';', found 'IDENT' ast251.go:9:3: expected ';', found 'IDENT' "go"261.go:9:7: expected ';', found 'IDENT' parser271.go:10:3: expected ';', found 'IDENT' "go"281.go:10:7: expected ';', found 'IDENT' token291.go:12:11: expected ';', found 'IDENT' main301.go:13:3: expected ';', found 'IDENT' fset311.go:13:8: expected ';', found

Count

Using AI Code Generation

1import (2func main() {3    fset := token.NewFileSet()4    node, err := parser.ParseFile(fset, "1.go", nil, parser.ParseComments)5    if err != nil {6        fmt.Println(err)7    }8    fmt.Println("Total number of comments: ", len(node.Comments))9    fmt.Println("Total number of comments: ", ast.CommentMap(fset, node, node.Comments).Count())10}

Count

Using AI Code Generation

1import (2func main() {3	fset := token.NewFileSet()4	f, err := parser.ParseFile(fset, "1.go", nil, 0)5	if err != nil {6		log.Fatal(err)7	}8	log.Println(f.Name.Name)9	log.Println(f.Decls)10	log.Println(len(f.Decls))11}

Count

Using AI Code Generation

1import (2func main() {3    fset := token.NewFileSet()4    node, err := parser.ParseFile(fset, "1.go", nil, parser.ParseComments)5    if err != nil {6        panic(err)7    }8    fmt.Println("Number of nodes in ast:", ast.Count(node))9}10Go | ast.NewIdent()11Go | ast.NewObj()12Go | ast.NewPackage()13Go | ast.NewScope()14Go | ast.NewValueSpec()15Go | ast.NewAssignStmt()16Go | ast.NewBadDecl()17Go | ast.NewBadExpr()

Count

Using AI Code Generation

1import (2func main() {3    f := ast.File{4        Name: &ast.Ident{5        },6        Decls: []ast.Decl{7            &ast.GenDecl{8                Specs: []ast.Spec{9                    &ast.ValueSpec{10                        Names: []*ast.Ident{11                            &ast.Ident{12                            },13                        },14                        Type: &ast.Ident{15                        },16                    },17                    &ast.ValueSpec{18                        Names: []*ast.Ident{19                            &ast.Ident{20                            },21                        },22                        Type: &ast.Ident{23                        },24                    },25                },26            },27        },28    }29    n := ast.New(nil)30    n.Count(&f, nil)31    fmt.Println(n.NumVars)32}

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