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How to use Ok method of ast Package
Best Syzkaller code snippet using ast.Ok
lint.go
Source:lint.go 
...1582 }1583 return nil, nil1584}1585func LintGuardedDelete(pass *analysis.Pass) (interface{}, error) {1586 isCommaOkMapIndex := func(stmt ast.Stmt) (b *ast.Ident, m ast.Expr, key ast.Expr, ok bool) {1587 // Has to be of the form `_, <b:*ast.Ident> = <m:*types.Map>[<key>]1588 assign, ok := stmt.(*ast.AssignStmt)1589 if !ok {1590 return nil, nil, nil, false1591 }1592 if len(assign.Lhs) != 2 || len(assign.Rhs) != 1 {1593 return nil, nil, nil, false1594 }1595 if !IsBlank(assign.Lhs[0]) {1596 return nil, nil, nil, false1597 }1598 ident, ok := assign.Lhs[1].(*ast.Ident)1599 if !ok {1600 return nil, nil, nil, false1601 }1602 index, ok := assign.Rhs[0].(*ast.IndexExpr)1603 if !ok {1604 return nil, nil, nil, false1605 }1606 if _, ok := pass.TypesInfo.TypeOf(index.X).(*types.Map); !ok {1607 return nil, nil, nil, false1608 }1609 key = index.Index1610 return ident, index.X, key, true1611 }1612 fn := func(node ast.Node) {1613 stmt := node.(*ast.IfStmt)1614 if len(stmt.Body.List) != 1 {1615 return1616 }1617 if stmt.Else != nil {1618 return1619 }1620 expr, ok := stmt.Body.List[0].(*ast.ExprStmt)1621 if !ok {1622 return1623 }1624 call, ok := expr.X.(*ast.CallExpr)1625 if !ok {1626 return1627 }1628 if !IsCallToAST(pass, call, "delete") {1629 return1630 }1631 b, m, key, ok := isCommaOkMapIndex(stmt.Init)1632 if !ok {1633 return1634 }1635 if cond, ok := stmt.Cond.(*ast.Ident); !ok || pass.TypesInfo.ObjectOf(cond) != pass.TypesInfo.ObjectOf(b) {1636 return1637 }1638 if Render(pass, call.Args[0]) != Render(pass, m) || Render(pass, call.Args[1]) != Render(pass, key) {1639 return1640 }1641 ReportNodefFG(pass, stmt, "unnecessary guard around call to delete")1642 }1643 pass.ResultOf[inspect.Analyzer].(*inspector.Inspector).Preorder([]ast.Node{(*ast.IfStmt)(nil)}, fn)1644 return nil, nil1645}...
match.go
Source:match.go
1package pattern2import (3 "fmt"4 "go/ast"5 "go/token"6 "go/types"7 "reflect"8)9var tokensByString = map[string]Token{10 "INT": Token(token.INT),11 "FLOAT": Token(token.FLOAT),12 "IMAG": Token(token.IMAG),13 "CHAR": Token(token.CHAR),14 "STRING": Token(token.STRING),15 "+": Token(token.ADD),16 "-": Token(token.SUB),17 "*": Token(token.MUL),18 "/": Token(token.QUO),19 "%": Token(token.REM),20 "&": Token(token.AND),21 "|": Token(token.OR),22 "^": Token(token.XOR),23 "<<": Token(token.SHL),24 ">>": Token(token.SHR),25 "&^": Token(token.AND_NOT),26 "+=": Token(token.ADD_ASSIGN),27 "-=": Token(token.SUB_ASSIGN),28 "*=": Token(token.MUL_ASSIGN),29 "/=": Token(token.QUO_ASSIGN),30 "%=": Token(token.REM_ASSIGN),31 "&=": Token(token.AND_ASSIGN),32 "|=": Token(token.OR_ASSIGN),33 "^=": Token(token.XOR_ASSIGN),34 "<<=": Token(token.SHL_ASSIGN),35 ">>=": Token(token.SHR_ASSIGN),36 "&^=": Token(token.AND_NOT_ASSIGN),37 "&&": Token(token.LAND),38 "||": Token(token.LOR),39 "<-": Token(token.ARROW),40 "++": Token(token.INC),41 "--": Token(token.DEC),42 "==": Token(token.EQL),43 "<": Token(token.LSS),44 ">": Token(token.GTR),45 "=": Token(token.ASSIGN),46 "!": Token(token.NOT),47 "!=": Token(token.NEQ),48 "<=": Token(token.LEQ),49 ">=": Token(token.GEQ),50 ":=": Token(token.DEFINE),51 "...": Token(token.ELLIPSIS),52 "IMPORT": Token(token.IMPORT),53 "VAR": Token(token.VAR),54 "TYPE": Token(token.TYPE),55 "CONST": Token(token.CONST),56 "BREAK": Token(token.BREAK),57 "CONTINUE": Token(token.CONTINUE),58 "GOTO": Token(token.GOTO),59 "FALLTHROUGH": Token(token.FALLTHROUGH),60}61func maybeToken(node Node) (Node, bool) {62 if node, ok := node.(String); ok {63 if tok, ok := tokensByString[string(node)]; ok {64 return tok, true65 }66 return node, false67 }68 return node, false69}70func isNil(v interface{}) bool {71 if v == nil {72 return true73 }74 if _, ok := v.(Nil); ok {75 return true76 }77 return false78}79type matcher interface {80 Match(*Matcher, interface{}) (interface{}, bool)81}82type State = map[string]interface{}83type Matcher struct {84 TypesInfo *types.Info85 State State86}87func (m *Matcher) fork() *Matcher {88 state := make(State, len(m.State))89 for k, v := range m.State {90 state[k] = v91 }92 return &Matcher{93 TypesInfo: m.TypesInfo,94 State: state,95 }96}97func (m *Matcher) merge(mc *Matcher) {98 m.State = mc.State99}100func (m *Matcher) Match(a Node, b ast.Node) bool {101 m.State = State{}102 _, ok := match(m, a, b)103 return ok104}105func Match(a Node, b ast.Node) (*Matcher, bool) {106 m := &Matcher{}107 ret := m.Match(a, b)108 return m, ret109}110// Match two items, which may be (Node, AST) or (AST, AST)111func match(m *Matcher, l, r interface{}) (interface{}, bool) {112 if _, ok := r.(Node); ok {113 panic("Node mustn't be on right side of match")114 }115 switch l := l.(type) {116 case *ast.ParenExpr:117 return match(m, l.X, r)118 case *ast.ExprStmt:119 return match(m, l.X, r)120 case *ast.DeclStmt:121 return match(m, l.Decl, r)122 case *ast.LabeledStmt:123 return match(m, l.Stmt, r)124 case *ast.BlockStmt:125 return match(m, l.List, r)126 case *ast.FieldList:127 return match(m, l.List, r)128 }129 switch r := r.(type) {130 case *ast.ParenExpr:131 return match(m, l, r.X)132 case *ast.ExprStmt:133 return match(m, l, r.X)134 case *ast.DeclStmt:135 return match(m, l, r.Decl)136 case *ast.LabeledStmt:137 return match(m, l, r.Stmt)138 case *ast.BlockStmt:139 if r == nil {140 return match(m, l, nil)141 }142 return match(m, l, r.List)143 case *ast.FieldList:144 if r == nil {145 return match(m, l, nil)146 }147 return match(m, l, r.List)148 case *ast.BasicLit:149 if r == nil {150 return match(m, l, nil)151 }152 }153 if l, ok := l.(matcher); ok {154 return l.Match(m, r)155 }156 if l, ok := l.(Node); ok {157 // Matching of pattern with concrete value158 return matchNodeAST(m, l, r)159 }160 if l == nil || r == nil {161 return nil, l == r162 }163 {164 ln, ok1 := l.(ast.Node)165 rn, ok2 := r.(ast.Node)166 if ok1 && ok2 {167 return matchAST(m, ln, rn)168 }169 }170 {171 obj, ok := l.(types.Object)172 if ok {173 switch r := r.(type) {174 case *ast.Ident:175 return obj, obj == m.TypesInfo.ObjectOf(r)176 case *ast.SelectorExpr:177 return obj, obj == m.TypesInfo.ObjectOf(r.Sel)178 default:179 return obj, false180 }181 }182 }183 {184 ln, ok1 := l.([]ast.Expr)185 rn, ok2 := r.([]ast.Expr)186 if ok1 || ok2 {187 if ok1 && !ok2 {188 rn = []ast.Expr{r.(ast.Expr)}189 } else if !ok1 && ok2 {190 ln = []ast.Expr{l.(ast.Expr)}191 }192 if len(ln) != len(rn) {193 return nil, false194 }195 for i, ll := range ln {196 if _, ok := match(m, ll, rn[i]); !ok {197 return nil, false198 }199 }200 return r, true201 }202 }203 {204 ln, ok1 := l.([]ast.Stmt)205 rn, ok2 := r.([]ast.Stmt)206 if ok1 || ok2 {207 if ok1 && !ok2 {208 rn = []ast.Stmt{r.(ast.Stmt)}209 } else if !ok1 && ok2 {210 ln = []ast.Stmt{l.(ast.Stmt)}211 }212 if len(ln) != len(rn) {213 return nil, false214 }215 for i, ll := range ln {216 if _, ok := match(m, ll, rn[i]); !ok {217 return nil, false218 }219 }220 return r, true221 }222 }223 {224 ln, ok1 := l.([]*ast.Field)225 rn, ok2 := r.([]*ast.Field)226 if ok1 || ok2 {227 if ok1 && !ok2 {228 rn = []*ast.Field{r.(*ast.Field)}229 } else if !ok1 && ok2 {230 ln = []*ast.Field{l.(*ast.Field)}231 }232 if len(ln) != len(rn) {233 return nil, false234 }235 for i, ll := range ln {236 if _, ok := match(m, ll, rn[i]); !ok {237 return nil, false238 }239 }240 return r, true241 }242 }243 panic(fmt.Sprintf("unsupported comparison: %T and %T", l, r))244}245// Match a Node with an AST node246func matchNodeAST(m *Matcher, a Node, b interface{}) (interface{}, bool) {247 switch b := b.(type) {248 case []ast.Stmt:249 // 'a' is not a List or we'd be using its Match250 // implementation.251 if len(b) != 1 {252 return nil, false253 }254 return match(m, a, b[0])255 case []ast.Expr:256 // 'a' is not a List or we'd be using its Match257 // implementation.258 if len(b) != 1 {259 return nil, false260 }261 return match(m, a, b[0])262 case ast.Node:263 ra := reflect.ValueOf(a)264 rb := reflect.ValueOf(b).Elem()265 if ra.Type().Name() != rb.Type().Name() {266 return nil, false267 }268 for i := 0; i < ra.NumField(); i++ {269 af := ra.Field(i)270 fieldName := ra.Type().Field(i).Name271 bf := rb.FieldByName(fieldName)272 if (bf == reflect.Value{}) {273 panic(fmt.Sprintf("internal error: could not find field %s in type %t when comparing with %T", fieldName, b, a))274 }275 ai := af.Interface()276 bi := bf.Interface()277 if ai == nil {278 return b, bi == nil279 }280 if _, ok := match(m, ai.(Node), bi); !ok {281 return b, false282 }283 }284 return b, true285 case nil:286 return nil, a == Nil{}287 default:288 panic(fmt.Sprintf("unhandled type %T", b))289 }290}291// Match two AST nodes292func matchAST(m *Matcher, a, b ast.Node) (interface{}, bool) {293 ra := reflect.ValueOf(a)294 rb := reflect.ValueOf(b)295 if ra.Type() != rb.Type() {296 return nil, false297 }298 if ra.IsNil() || rb.IsNil() {299 return rb, ra.IsNil() == rb.IsNil()300 }301 ra = ra.Elem()302 rb = rb.Elem()303 for i := 0; i < ra.NumField(); i++ {304 af := ra.Field(i)305 bf := rb.Field(i)306 if af.Type() == rtTokPos || af.Type() == rtObject || af.Type() == rtCommentGroup {307 continue308 }309 switch af.Kind() {310 case reflect.Slice:311 if af.Len() != bf.Len() {312 return nil, false313 }314 for j := 0; j < af.Len(); j++ {315 if _, ok := match(m, af.Index(j).Interface().(ast.Node), bf.Index(j).Interface().(ast.Node)); !ok {316 return nil, false317 }318 }319 case reflect.String:320 if af.String() != bf.String() {321 return nil, false322 }323 case reflect.Int:324 if af.Int() != bf.Int() {325 return nil, false326 }327 case reflect.Bool:328 if af.Bool() != bf.Bool() {329 return nil, false330 }331 case reflect.Ptr, reflect.Interface:332 if _, ok := match(m, af.Interface(), bf.Interface()); !ok {333 return nil, false334 }335 default:336 panic(fmt.Sprintf("internal error: unhandled kind %s (%T)", af.Kind(), af.Interface()))337 }338 }339 return b, true340}341func (b Binding) Match(m *Matcher, node interface{}) (interface{}, bool) {342 if isNil(b.Node) {343 v, ok := m.State[b.Name]344 if ok {345 // Recall value346 return match(m, v, node)347 }348 // Matching anything349 b.Node = Any{}350 }351 // Store value352 if _, ok := m.State[b.Name]; ok {353 panic(fmt.Sprintf("binding already created: %s", b.Name))354 }355 new, ret := match(m, b.Node, node)356 if ret {357 m.State[b.Name] = new358 }359 return new, ret360}361func (Any) Match(m *Matcher, node interface{}) (interface{}, bool) {362 return node, true363}364func (l List) Match(m *Matcher, node interface{}) (interface{}, bool) {365 v := reflect.ValueOf(node)366 if v.Kind() == reflect.Slice {367 if isNil(l.Head) {368 return node, v.Len() == 0369 }370 if v.Len() == 0 {371 return nil, false372 }373 // OPT(dh): don't check the entire tail if head didn't match374 _, ok1 := match(m, l.Head, v.Index(0).Interface())375 _, ok2 := match(m, l.Tail, v.Slice(1, v.Len()).Interface())376 return node, ok1 && ok2377 }378 // Our empty list does not equal an untyped Go nil. This way, we can379 // tell apart an if with no else and an if with an empty else.380 return nil, false381}382func (s String) Match(m *Matcher, node interface{}) (interface{}, bool) {383 switch o := node.(type) {384 case token.Token:385 if tok, ok := maybeToken(s); ok {386 return match(m, tok, node)387 }388 return nil, false389 case string:390 return o, string(s) == o391 default:392 return nil, false393 }394}395func (tok Token) Match(m *Matcher, node interface{}) (interface{}, bool) {396 o, ok := node.(token.Token)397 if !ok {398 return nil, false399 }400 return o, token.Token(tok) == o401}402func (Nil) Match(m *Matcher, node interface{}) (interface{}, bool) {403 return nil, isNil(node) || reflect.ValueOf(node).IsNil()404}405func (builtin Builtin) Match(m *Matcher, node interface{}) (interface{}, bool) {406 r, ok := match(m, Ident(builtin), node)407 if !ok {408 return nil, false409 }410 ident := r.(*ast.Ident)411 obj := m.TypesInfo.ObjectOf(ident)412 if obj != types.Universe.Lookup(ident.Name) {413 return nil, false414 }415 return ident, true416}417func (obj Object) Match(m *Matcher, node interface{}) (interface{}, bool) {418 r, ok := match(m, Ident(obj), node)419 if !ok {420 return nil, false421 }422 ident := r.(*ast.Ident)423 id := m.TypesInfo.ObjectOf(ident)424 _, ok = match(m, obj.Name, ident.Name)425 return id, ok426}427func (fn Function) Match(m *Matcher, node interface{}) (interface{}, bool) {428 var name string429 var obj types.Object430 r, ok := match(m, Or{Nodes: []Node{Ident{Any{}}, SelectorExpr{Any{}, Any{}}}}, node)431 if !ok {432 return nil, false433 }434 switch r := r.(type) {435 case *ast.Ident:436 obj = m.TypesInfo.ObjectOf(r)437 switch obj := obj.(type) {438 case *types.Func:439 // OPT(dh): optimize this similar to code.FuncName440 name = obj.FullName()441 case *types.Builtin:442 name = obj.Name()443 default:444 return nil, false445 }446 case *ast.SelectorExpr:447 var ok bool448 obj, ok = m.TypesInfo.ObjectOf(r.Sel).(*types.Func)449 if !ok {450 return nil, false451 }452 // OPT(dh): optimize this similar to code.FuncName453 name = obj.(*types.Func).FullName()454 default:455 panic("unreachable")456 }457 _, ok = match(m, fn.Name, name)458 return obj, ok459}460func (or Or) Match(m *Matcher, node interface{}) (interface{}, bool) {461 for _, opt := range or.Nodes {462 mc := m.fork()463 if ret, ok := match(mc, opt, node); ok {464 m.merge(mc)465 return ret, true466 }467 }468 return nil, false469}470func (not Not) Match(m *Matcher, node interface{}) (interface{}, bool) {471 _, ok := match(m, not.Node, node)472 if ok {473 return nil, false474 }475 return node, true476}477var (478 // Types of fields in go/ast structs that we want to skip479 rtTokPos = reflect.TypeOf(token.Pos(0))480 rtObject = reflect.TypeOf((*ast.Object)(nil))481 rtCommentGroup = reflect.TypeOf((*ast.CommentGroup)(nil))482)483var (484 _ matcher = Binding{}485 _ matcher = Any{}486 _ matcher = List{}487 _ matcher = String("")488 _ matcher = Token(0)489 _ matcher = Nil{}490 _ matcher = Builtin{}491 _ matcher = Object{}492 _ matcher = Function{}493 _ matcher = Or{}494 _ matcher = Not{}495)...
Ok
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 fmt.Println(err)7 }8 ast.Inspect(f, func(n ast.Node) bool {9 switch x := n.(type) {10 if x.Name == "main" {11 fmt.Println(x.NamePos)12 fmt.Println(x.Obj)13 fmt.Println(x.Obj.Kind)14 fmt.Println(x.Obj.Name)15 fmt.Println(x.Obj.Decl)16 fmt.Println(x.Obj.Data)17 fmt.Println(x.Obj.Pos())18 fmt.Println(x.Obj.End())19 fmt.Println(x.Obj.Parent())20 fmt.Println(x.Obj.Kind == ast.Var)21 fmt.Println(x.Obj.Kind == ast.Con)22 fmt.Println(x.Obj.Kind == ast.Typ)23 fmt.Println(x.Obj.Kind == ast.Fun)24 fmt.Println(x.Obj.Kind == ast.Lbl)25 fmt.Println(x.Obj.Kind == ast.Pkg)26 fmt.Println(x.Obj.Kind == ast.Bad)27 fmt.Println(x.Obj.Kind == ast.Fil)28 fmt.Println(x.Obj.Kind == ast.Pkg)29 fmt.Println(x.Obj.Kind == ast.Bad)30 fmt.Println(x.Obj.Kind == ast.Fil)31 fmt.Println(x.Obj.Kind == ast.Pkg)32 fmt.Println(x.Obj.Kind == ast.Bad)33 fmt.Println(x.Obj.Kind == ast.Fil)34 }35 }36 })37}38import (39func main() {40 fset := token.NewFileSet()41 f, err := parser.ParseFile(fset, "1.go", nil, 0)42 if err != nil {43 fmt.Println(err)44 }45 ast.Inspect(f, func(n ast.Node) bool {46 switch x := n.(type) {47 if x.Name == "main" {48 fmt.Println(x.NamePos)49 fmt.Println(x.Obj)50 fmt.Println(x.Obj.Kind)51 fmt.Println(x.Obj.Name)52 fmt.Println(x.Obj.Decl)53 fmt.Println(x.Obj.Data)
Ok
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 ast.Inspect(node, func(n ast.Node) bool {9 switch x := n.(type) {10 fmt.Println(x.Name, x.Type, x.Body, x.Doc)11 }12 })13}14main *ast.FuncType 0xc0000c8000 &ast.CommentGroup{List:[]*ast.Comment{(*ast.Comment)(0xc0000c8000)}}
Ok
Using AI Code Generation
1import (2func main() {3 f, err := parser.ParseFile(fset, "2.go", nil, parser.ImportsOnly)4 if err != nil {5 fmt.Println(err)6 }7 for _, s := range f.Imports {8 fmt.Println(s.Path.Value)9 }10}11import (12func main() {13 f, err := parser.ParseFile(fset, "2.go", nil, parser.ParseComments)14 if err != nil {15 fmt.Println(err)16 }17 ast.Inspect(f, func(n ast.Node) bool {18 switch x := n.(type) {19 fmt.Println(x.Path.Value)20 }21 })22}
Ok
Using AI Code Generation
1import (2func main() {3 ident := ast.NewIdent("main")4 fmt.Println(ident.Ok())5}6import (7func main() {8 ident := ast.NewIdent("main")9 pos := token.Pos(1)10 ident.SetPos(pos)11 fmt.Println(ident.Pos())12}13import (14func main() {15 ident := ast.NewIdent("main")16 pos := token.Pos(1)17 ident.SetPos(pos)18 fmt.Println(ident.Pos())19}20import (21func main() {22 ident := ast.NewIdent("main")23 fmt.Println(ident.String())24}25import (26func main() {27 ident := ast.NewIdent("main")28 fmt.Println(ident.Value())29}
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Most used method in
- Info
- Clone
- cloneFields
- cloneInts
- cloneTypes
- cloneComments
- Filter
- Format
- FormatWriter
- SerializeNode
- FormatInt
- FormatStr
- serialize
- fmtField
- fmtType
- fmtTypeList
- fmtIdentList
- fmtInt
- comma
- Parse
- ParseGlob
- parseTopRecover
- parseTop
- next
- consume
- tryConsume
- expect
- parseComment
- parseMeta
- parseDefine
- parseInclude
- parseIncdir
- parseResource
- parseTypeDef
- parseCall
- callName
- parseFlags
- parseIntFlags
- parseStrFlags
- parseStruct
- parseCommentBlock
- parseField
- parseType
- parseTypeList
- parseIdent
- parseString
- strTokToFmt
- parseInt
- parseIntValue
- parseCExpr
- TestParseAll
- TestParse
- TestErrors
- init
- String
- newScanner
- LoggingHandler
- Builtin
- less
- Scan
- scanStr
- scanInt
- scanChar
- scanIdent
- Error
- Ok
- skipWhitespace
- pos
- NewErrorMatcher
- ErrorHandler
- Count
- Check
- DumpErrors
- walk
- Recursive
- PostRecursive
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