How to use comma method of ast Package

Best Syzkaller code snippet using ast.comma

parser.go

Source:parser.go Github

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...124 gotComma := false125 namedArgumentAdded := false126 first := true127 for {128 commaFodder := ast.Fodder{}129 next := p.peek()130 if next.kind == tokenParenR {131 // gotComma can be true or false here.132 return p.pop(), args, gotComma, nil133 }134 if !first && !gotComma {135 return nil, nil, false, errors.MakeStaticError(fmt.Sprintf("Expected a comma before next %s, got %s", elementKind, next), next.loc)136 }137 idFodder, id, eqFodder, expr, err := p.parseArgument()138 if err != nil {139 return nil, nil, false, err140 }141 if p.peek().kind == tokenComma {142 comma := p.pop()143 gotComma = true144 commaFodder = comma.fodder145 } else {146 gotComma = false147 }148 if id == nil {149 if namedArgumentAdded {150 return nil, nil, false, errors.MakeStaticError("Positional argument after a named argument is not allowed", next.loc)151 }152 el := ast.CommaSeparatedExpr{Expr: expr}153 if gotComma {154 el.CommaFodder = commaFodder155 }156 args.Positional = append(args.Positional, el)157 } else {158 namedArgumentAdded = true159 args.Named = append(args.Named, ast.NamedArgument{160 NameFodder: idFodder,161 Name: *id,162 EqFodder: eqFodder,163 Arg: expr,164 CommaFodder: commaFodder,165 })166 }167 first = false168 }169}170// parseParameter parses either <f1> id <f2> = expr or just <f1> id.171// It returns either (<f1>, id, <f2>, expr) or (<f1>, id, nil, nil)172// respectively.173func (p *parser) parseParameter() (ast.Parameter, errors.StaticError) {174 ret := ast.Parameter{}175 ident, err := p.popExpect(tokenIdentifier)176 if err != nil {177 return ret, err.WithContext("parsing parameter")178 }179 ret.Name = ast.Identifier(ident.data)180 ret.NameFodder = ident.fodder181 ret.LocRange = ident.loc182 if p.peek().kind == tokenOperator && p.peek().data == "=" {183 eq := p.pop()184 ret.EqFodder = eq.fodder185 ret.DefaultArg, err = p.parse(maxPrecedence)186 if err != nil {187 return ret, err188 }189 ret.LocRange = locFromTokenAST(ident, ret.DefaultArg)190 }191 return ret, nil192}193// TODO(sbarzowski) - this returned bool is weird194func (p *parser) parseParameters(elementKind string) (*token, []ast.Parameter, bool, errors.StaticError) {195 var parenR *token196 var params []ast.Parameter197 gotComma := false198 first := true199 for {200 next := p.peek()201 if next.kind == tokenParenR {202 // gotComma can be true or false here.203 parenR = p.pop()204 break205 }206 if !first && !gotComma {207 return nil, nil, false, errors.MakeStaticError(fmt.Sprintf("Expected a comma before next %s, got %s", elementKind, next), next.loc)208 }209 param, err := p.parseParameter()210 if err != nil {211 return nil, nil, false, err212 }213 if p.peek().kind == tokenComma {214 comma := p.pop()215 param.CommaFodder = comma.fodder216 gotComma = true217 } else {218 gotComma = false219 }220 params = append(params, param)221 first = false222 }223 return parenR, params, gotComma, nil224}225// TODO(sbarzowski) add location to all individual binds226func (p *parser) parseBind(binds *ast.LocalBinds) (*token, errors.StaticError) {227 varID, popErr := p.popExpect(tokenIdentifier)228 if popErr != nil {229 return nil, popErr230 }231 for _, b := range *binds {232 if b.Variable == ast.Identifier(varID.data) {233 return nil, errors.MakeStaticError(fmt.Sprintf("Duplicate local var: %v", varID.data), varID.loc)234 }235 }236 var fun *ast.Function237 if p.peek().kind == tokenParenL {238 parenL := p.pop()239 parenR, params, gotComma, err := p.parseParameters("function parameter")240 if err != nil {241 return nil, err242 }243 fun = &ast.Function{244 ParenLeftFodder: parenL.fodder,245 Parameters: params,246 TrailingComma: gotComma,247 ParenRightFodder: parenR.fodder,248 // Body gets filled in later.249 }250 }251 eqToken, popErr := p.popExpectOp("=")252 if popErr != nil {253 return nil, popErr254 }255 body, err := p.parse(maxPrecedence)256 if err != nil {257 return nil, err258 }259 delim := p.pop()260 if delim.kind != tokenSemicolon && delim.kind != tokenComma {261 return nil, errors.MakeStaticError(fmt.Sprintf("Expected , or ; but got %v", delim), delim.loc)262 }263 if fun != nil {264 fun.NodeBase = ast.NewNodeBaseLoc(locFromTokenAST(varID, body), nil)265 fun.Body = body266 *binds = append(*binds, ast.LocalBind{267 VarFodder: varID.fodder,268 Variable: ast.Identifier(varID.data),269 EqFodder: eqToken.fodder,270 Body: body,271 Fun: fun,272 CloseFodder: delim.fodder,273 LocRange: locFromTokenAST(varID, body),274 })275 } else {276 *binds = append(*binds, ast.LocalBind{277 VarFodder: varID.fodder,278 Variable: ast.Identifier(varID.data),279 EqFodder: eqToken.fodder,280 Body: body,281 CloseFodder: delim.fodder,282 LocRange: locFromTokenAST(varID, body),283 })284 }285 return delim, nil286}287func (p *parser) parseObjectAssignmentOp() (opFodder ast.Fodder, plusSugar bool, hide ast.ObjectFieldHide, err errors.StaticError) {288 op, err := p.popExpect(tokenOperator)289 if err != nil {290 return291 }292 opFodder = op.fodder293 opStr := op.data294 if opStr[0] == '+' {295 plusSugar = true296 opStr = opStr[1:]297 }298 numColons := 0299 for len(opStr) > 0 {300 if opStr[0] != ':' {301 err = errors.MakeStaticError(302 fmt.Sprintf("Expected one of :, ::, :::, +:, +::, +:::, got: %v", op.data), op.loc)303 return304 }305 opStr = opStr[1:]306 numColons++307 }308 switch numColons {309 case 1:310 hide = ast.ObjectFieldInherit311 case 2:312 hide = ast.ObjectFieldHidden313 case 3:314 hide = ast.ObjectFieldVisible315 default:316 err = errors.MakeStaticError(317 fmt.Sprintf("Expected one of :, ::, :::, +:, +::, +:::, got: %v", op.data), op.loc)318 return319 }320 return321}322// A LiteralField is a field of an object or object comprehension.323// +gen set324type LiteralField string325func (p *parser) parseObjectRemainderComp(fields ast.ObjectFields, gotComma bool, tok *token, next *token) (ast.Node, *token, errors.StaticError) {326 numFields := 0327 numAsserts := 0328 var field ast.ObjectField329 for _, f := range fields {330 if f.Kind == ast.ObjectLocal {331 continue332 }333 if f.Kind == ast.ObjectAssert {334 numAsserts++335 continue336 }337 numFields++338 field = f339 }340 if numAsserts > 0 {341 return nil, nil, errors.MakeStaticError("Object comprehension cannot have asserts", next.loc)342 }343 if numFields != 1 {344 return nil, nil, errors.MakeStaticError("Object comprehension can only have one field", next.loc)345 }346 if field.Hide != ast.ObjectFieldInherit {347 return nil, nil, errors.MakeStaticError("Object comprehensions cannot have hidden fields", next.loc)348 }349 if field.Kind != ast.ObjectFieldExpr {350 return nil, nil, errors.MakeStaticError("Object comprehensions can only have [e] fields", next.loc)351 }352 spec, last, err := p.parseComprehensionSpecs(next, tokenBraceR)353 if err != nil {354 return nil, nil, err355 }356 return &ast.ObjectComp{357 NodeBase: ast.NewNodeBaseLoc(locFromTokens(tok, last), tok.fodder),358 Fields: fields,359 TrailingComma: gotComma,360 Spec: *spec,361 CloseFodder: last.fodder,362 }, last, nil363}364func (p *parser) parseObjectRemainderField(literalFields *LiteralFieldSet, tok *token, next *token) (*ast.ObjectField, errors.StaticError) {365 var kind ast.ObjectFieldKind366 var fodder1 ast.Fodder367 var expr1 ast.Node368 var id *ast.Identifier369 var fodder2 ast.Fodder370 switch next.kind {371 case tokenIdentifier:372 kind = ast.ObjectFieldID373 id = (*ast.Identifier)(&next.data)374 fodder1 = next.fodder375 case tokenStringDouble, tokenStringSingle,376 tokenStringBlock, tokenVerbatimStringDouble, tokenVerbatimStringSingle:377 kind = ast.ObjectFieldStr378 expr1 = tokenStringToAst(next)379 default:380 fodder1 = next.fodder381 kind = ast.ObjectFieldExpr382 var err errors.StaticError383 expr1, err = p.parse(maxPrecedence)384 if err != nil {385 return nil, err386 }387 bracketR, err := p.popExpect(tokenBracketR)388 if err != nil {389 return nil, err390 }391 fodder2 = bracketR.fodder392 }393 isMethod := false394 methComma := false395 var parenL *token396 var parenR *token397 var params []ast.Parameter398 if p.peek().kind == tokenParenL {399 parenL = p.pop()400 var err errors.StaticError401 parenR, params, methComma, err = p.parseParameters("method parameter")402 if err != nil {403 return nil, err404 }405 isMethod = true406 }407 opFodder, plusSugar, hide, err := p.parseObjectAssignmentOp()408 if err != nil {409 return nil, err410 }411 if plusSugar && isMethod {412 return nil, errors.MakeStaticError(413 fmt.Sprintf("Cannot use +: syntax sugar in a method: %v", next.data), next.loc)414 }415 if kind != ast.ObjectFieldExpr {416 if !literalFields.Add(LiteralField(next.data)) {417 return nil, errors.MakeStaticError(418 fmt.Sprintf("Duplicate field: %v", next.data), next.loc)419 }420 }421 body, err := p.parse(maxPrecedence)422 if err != nil {423 return nil, err424 }425 var method *ast.Function426 if isMethod {427 method = &ast.Function{428 ParenLeftFodder: parenL.fodder,429 Parameters: params,430 TrailingComma: methComma,431 ParenRightFodder: parenR.fodder,432 Body: body,433 }434 }435 var commaFodder ast.Fodder436 if p.peek().kind == tokenComma {437 commaFodder = p.peek().fodder438 }439 return &ast.ObjectField{440 Kind: kind,441 Hide: hide,442 SuperSugar: plusSugar,443 Method: method,444 Fodder1: fodder1,445 Expr1: expr1,446 Id: id,447 Fodder2: fodder2,448 OpFodder: opFodder,449 Expr2: body,450 CommaFodder: commaFodder,451 LocRange: locFromTokenAST(next, body),452 }, nil453}454func (p *parser) parseObjectRemainderLocal(binds *ast.IdentifierSet, tok *token, next *token) (*ast.ObjectField, errors.StaticError) {455 varID, popErr := p.popExpect(tokenIdentifier)456 if popErr != nil {457 return nil, popErr458 }459 id := ast.Identifier(varID.data)460 if binds.Contains(id) {461 return nil, errors.MakeStaticError(fmt.Sprintf("Duplicate local var: %v", id), varID.loc)462 }463 // TODO(sbarzowski) Can we reuse regular local bind parsing here?464 isMethod := false465 funcComma := false466 var parenL *token467 var parenR *token468 var params []ast.Parameter469 if p.peek().kind == tokenParenL {470 parenL = p.pop()471 isMethod = true472 var err errors.StaticError473 parenR, params, funcComma, err = p.parseParameters("function parameter")474 if err != nil {475 return nil, err476 }477 }478 opToken, popErr := p.popExpectOp("=")479 if popErr != nil {480 return nil, popErr481 }482 body, err := p.parse(maxPrecedence)483 if err != nil {484 return nil, err485 }486 var method *ast.Function487 if isMethod {488 method = &ast.Function{489 ParenLeftFodder: parenL.fodder,490 Parameters: params,491 ParenRightFodder: parenR.fodder,492 TrailingComma: funcComma,493 Body: body,494 }495 }496 binds.Add(id)497 var commaFodder ast.Fodder498 if p.peek().kind == tokenComma {499 commaFodder = p.peek().fodder500 }501 return &ast.ObjectField{502 Kind: ast.ObjectLocal,503 Hide: ast.ObjectFieldVisible,504 SuperSugar: false,505 Method: method,506 Fodder1: next.fodder,507 Fodder2: varID.fodder,508 Id: &id,509 OpFodder: opToken.fodder,510 Expr2: body,511 CommaFodder: commaFodder,512 LocRange: locFromTokenAST(varID, body),513 }, nil514}515func (p *parser) parseObjectRemainderAssert(tok *token, next *token) (*ast.ObjectField, errors.StaticError) {516 cond, err := p.parse(maxPrecedence)517 if err != nil {518 return nil, err519 }520 lastAST := cond // for determining location521 var msg ast.Node522 var colonFodder ast.Fodder523 if p.peek().kind == tokenOperator && p.peek().data == ":" {524 colonToken := p.pop()525 colonFodder = colonToken.fodder526 msg, err = p.parse(maxPrecedence)527 if err != nil {528 return nil, err529 }530 lastAST = msg531 }532 var commaFodder ast.Fodder533 if p.peek().kind == tokenComma {534 commaFodder = p.peek().fodder535 }536 return &ast.ObjectField{537 Kind: ast.ObjectAssert,538 Hide: ast.ObjectFieldVisible,539 Fodder1: next.fodder,540 Expr2: cond,541 OpFodder: colonFodder,542 Expr3: msg,543 CommaFodder: commaFodder,544 LocRange: locFromTokenAST(next, lastAST),545 }, nil546}547// Parse object or object comprehension without leading brace548func (p *parser) parseObjectRemainder(tok *token) (ast.Node, *token, errors.StaticError) {549 var fields ast.ObjectFields550 literalFields := make(LiteralFieldSet)551 binds := make(ast.IdentifierSet)552 gotComma := false553 first := true554 next := p.pop()555 for {556 if next.kind == tokenBraceR {557 return &ast.Object{558 NodeBase: ast.NewNodeBaseLoc(locFromTokens(tok, next), tok.fodder),559 Fields: fields,560 TrailingComma: gotComma,561 CloseFodder: next.fodder,562 }, next, nil563 }564 if next.kind == tokenFor {565 // It's a comprehension566 return p.parseObjectRemainderComp(fields, gotComma, tok, next)567 }568 if !gotComma && !first {569 return nil, nil, errors.MakeStaticError("Expected a comma before next field", next.loc)570 }571 var field *ast.ObjectField572 var err errors.StaticError573 switch next.kind {574 case tokenBracketL, tokenIdentifier, tokenStringDouble, tokenStringSingle,575 tokenStringBlock, tokenVerbatimStringDouble, tokenVerbatimStringSingle:576 field, err = p.parseObjectRemainderField(&literalFields, tok, next)577 if err != nil {578 return nil, nil, err579 }580 case tokenLocal:581 field, err = p.parseObjectRemainderLocal(&binds, tok, next)582 if err != nil {583 return nil, nil, err584 }585 case tokenAssert:586 field, err = p.parseObjectRemainderAssert(tok, next)587 if err != nil {588 return nil, nil, err589 }590 default:591 return nil, nil, makeUnexpectedError(next, "parsing field definition")592 }593 fields = append(fields, *field)594 next = p.pop()595 if next.kind == tokenComma {596 gotComma = true597 next = p.pop()598 } else {599 gotComma = false600 }601 first = false602 }603}604/* parses for x in expr for y in expr if expr for z in expr ... */605func (p *parser) parseComprehensionSpecs(forToken *token, end tokenKind) (*ast.ForSpec, *token, errors.StaticError) {606 var parseComprehensionSpecsHelper func(forToken *token, outer *ast.ForSpec) (*ast.ForSpec, *token, errors.StaticError)607 parseComprehensionSpecsHelper = func(forToken *token, outer *ast.ForSpec) (*ast.ForSpec, *token, errors.StaticError) {608 var ifSpecs []ast.IfSpec609 varID, popErr := p.popExpect(tokenIdentifier)610 if popErr != nil {611 return nil, nil, popErr612 }613 id := ast.Identifier(varID.data)614 inToken, err := p.popExpect(tokenIn)615 if err != nil {616 return nil, nil, err617 }618 arr, err := p.parse(maxPrecedence)619 if err != nil {620 return nil, nil, err621 }622 forSpec := &ast.ForSpec{623 ForFodder: forToken.fodder,624 VarFodder: varID.fodder,625 VarName: id,626 InFodder: inToken.fodder,627 Expr: arr,628 Outer: outer,629 }630 maybeIf := p.pop()631 for ; maybeIf.kind == tokenIf; maybeIf = p.pop() {632 cond, err := p.parse(maxPrecedence)633 if err != nil {634 return nil, nil, err635 }636 ifSpecs = append(ifSpecs, ast.IfSpec{637 IfFodder: maybeIf.fodder,638 Expr: cond,639 })640 }641 forSpec.Conditions = ifSpecs642 if maybeIf.kind == end {643 return forSpec, maybeIf, nil644 }645 if maybeIf.kind != tokenFor {646 return nil, nil, errors.MakeStaticError(647 fmt.Sprintf("Expected for, if or %v after for clause, got: %v", end, maybeIf), maybeIf.loc)648 }649 return parseComprehensionSpecsHelper(maybeIf, forSpec)650 }651 return parseComprehensionSpecsHelper(forToken, nil)652}653// Assumes that the leading '[' has already been consumed and passed as tok.654// Should read up to and consume the trailing ']'655func (p *parser) parseArray(tok *token) (ast.Node, errors.StaticError) {656 if p.peek().kind == tokenBracketR {657 bracketR := p.pop()658 return &ast.Array{659 NodeBase: ast.NewNodeBaseLoc(locFromTokens(tok, bracketR), tok.fodder),660 CloseFodder: bracketR.fodder,661 }, nil662 }663 first, err := p.parse(maxPrecedence)664 if err != nil {665 return nil, err666 }667 var gotComma bool668 var commaFodder ast.Fodder669 if p.peek().kind == tokenComma {670 comma := p.pop()671 gotComma = true672 commaFodder = comma.fodder673 }674 if p.peek().kind == tokenFor {675 // It's a comprehension676 forToken := p.pop()677 spec, last, err := p.parseComprehensionSpecs(forToken, tokenBracketR)678 if err != nil {679 return nil, err680 }681 return &ast.ArrayComp{682 NodeBase: ast.NewNodeBaseLoc(locFromTokens(tok, last), tok.fodder),683 Body: first,684 TrailingComma: gotComma,685 TrailingCommaFodder: commaFodder,686 Spec: *spec,687 CloseFodder: last.fodder,688 }, nil689 }690 // Not a comprehension: It can have more elements.691 elements := []ast.CommaSeparatedExpr{{692 Expr: first,693 CommaFodder: commaFodder,694 }}695 var bracketR *token696 for {697 next := p.peek()698 if next.kind == tokenBracketR {699 bracketR = p.pop()700 break701 }702 if !gotComma {703 return nil, errors.MakeStaticError("Expected a comma before next array element", next.loc)704 }705 nextElem, err := p.parse(maxPrecedence)706 if err != nil {707 return nil, err708 }709 element := ast.CommaSeparatedExpr{710 Expr: nextElem,711 }712 if p.peek().kind == tokenComma {713 comma := p.pop()714 gotComma = true715 element.CommaFodder = comma.fodder716 } else {717 gotComma = false718 }719 elements = append(elements, element)720 }721 return &ast.Array{722 NodeBase: ast.NewNodeBaseLoc(locFromTokens(tok, bracketR),723 tok.fodder),724 Elements: elements,725 TrailingComma: gotComma,726 CloseFodder: bracketR.fodder,727 }, nil728}729func tokenStringToAst(tok *token) *ast.LiteralString {...

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fix_trailing_commas.go

Source:fix_trailing_commas.go Github

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...22 }23 }24 return false25}26// FixTrailingCommas is a formatter pass that ensures trailing commas are27// present when a list is split over several lines.28type FixTrailingCommas struct {29 pass.Base30}31func (c *FixTrailingCommas) fixComma(lastCommaFodder *ast.Fodder, trailingComma *bool, closeFodder *ast.Fodder) {32 needComma := containsNewline(*closeFodder) || containsNewline(*lastCommaFodder)33 if *trailingComma {34 if !needComma {35 // Remove it but keep fodder.36 *trailingComma = false37 ast.FodderMoveFront(closeFodder, lastCommaFodder)38 } else if containsNewline(*lastCommaFodder) {39 // The comma is needed but currently is separated by a newline.40 ast.FodderMoveFront(closeFodder, lastCommaFodder)41 }42 } else {43 if needComma {44 // There was no comma, but there was a newline before the ] so add a comma.45 *trailingComma = true46 }47 }48}49func (c *FixTrailingCommas) removeComma(lastCommaFodder *ast.Fodder, trailingComma *bool, closeFodder *ast.Fodder) {50 if *trailingComma {51 // Remove it but keep fodder.52 *trailingComma = false53 ast.FodderMoveFront(closeFodder, lastCommaFodder)54 }55}56// Array handles that type of node57func (c *FixTrailingCommas) Array(p pass.ASTPass, node *ast.Array, ctx pass.Context) {58 if len(node.Elements) == 0 {59 // No comma present and none can be added.60 return61 }62 c.fixComma(&node.Elements[len(node.Elements)-1].CommaFodder, &node.TrailingComma, &node.CloseFodder)63 c.Base.Array(p, node, ctx)64}65// ArrayComp handles that type of node66func (c *FixTrailingCommas) ArrayComp(p pass.ASTPass, node *ast.ArrayComp, ctx pass.Context) {67 c.removeComma(&node.TrailingCommaFodder, &node.TrailingComma, &node.Spec.ForFodder)68 c.Base.ArrayComp(p, node, ctx)69}70// Object handles that type of node71func (c *FixTrailingCommas) Object(p pass.ASTPass, node *ast.Object, ctx pass.Context) {72 if len(node.Fields) == 0 {73 // No comma present and none can be added.74 return75 }76 c.fixComma(&node.Fields[len(node.Fields)-1].CommaFodder, &node.TrailingComma, &node.CloseFodder)77 c.Base.Object(p, node, ctx)78}79// ObjectComp handles that type of node80func (c *FixTrailingCommas) ObjectComp(p pass.ASTPass, node *ast.ObjectComp, ctx pass.Context) {81 c.removeComma(&node.Fields[len(node.Fields)-1].CommaFodder, &node.TrailingComma, &node.Spec.ForFodder)82 c.Base.ObjectComp(p, node, ctx)83}...

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comma

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

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comma

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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.Print(fset, node)9}10import "fmt"11func main() {12 fmt.Println("Hello, World!")13}14Your name to display (optional):15Your name to display (optional):

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comma

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1import (2func main() {3 f, err := parser.ParseFile(fset, "2.go", nil, parser.ParseComments)4 if err != nil {5 log.Fatal(err)6 }7 ast.Print(fset, f)8 ast.Print(fset, f)9 ast.Print(fset, f)10 ast.Print(fset, f)11}12import (13func main() {14 f, err := parser.ParseFile(fset, "3.go", nil, parser.ParseComments)15 if err != nil {16 log.Fatal(err)17 }18 ast.Print(fset, f)19 ast.Print(fset, f)20 ast.Print(fset, f)21 ast.Print(fset, f)22}23import (24func main() {25 f, err := parser.ParseFile(fset, "4.go", nil, parser.ParseComments)26 if err != nil {27 log.Fatal(err)28 }29 ast.Print(fset, f)30 ast.Print(fset, f)31 ast.Print(fset, f)32 ast.Print(fset, f)33}

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1import "fmt"2import "go/ast"3func main() {4 x := ast.NewIdent("x")5 y := ast.NewIdent("y")6 z := ast.NewIdent("z")7 c := ast.NewBinaryExpr(x, token.ADD, y)8 d := ast.NewBinaryExpr(c, token.SUB, z)9 fmt.Println(ast.Print(nil, d))10}11import "fmt"12import "go/ast"13func main() {14 x := ast.NewIdent("x")15 y := ast.NewIdent("y")16 z := ast.NewIdent("z")17 c := ast.NewBinaryExpr(x, token.ADD, y)18 d := ast.NewBinaryExpr(c, token.SUB, z)19 fmt.Println(ast.Print(nil, d))20}21import "fmt"22import "go/ast"23func main() {24 x := ast.NewIdent("x")25 y := ast.NewIdent("y")26 z := ast.NewIdent("z")27 c := ast.NewBinaryExpr(x, token.ADD, y)28 d := ast.NewBinaryExpr(c, token.SUB, z)29 fmt.Println(ast.Print(nil, d))30}31import "fmt"32import "go/ast"33func main() {34 x := ast.NewIdent("x")35 y := ast.NewIdent("y")36 z := ast.NewIdent("z")37 c := ast.NewBinaryExpr(x, token.ADD, y)38 d := ast.NewBinaryExpr(c, token.SUB, z)39 fmt.Println(ast.Print(nil, d))40}41import "fmt"42import "go/ast"43func main() {44 x := ast.NewIdent("x")45 y := ast.NewIdent("y")46 z := ast.NewIdent("z")47 c := ast.NewBinaryExpr(x, token.ADD, y)48 d := ast.NewBinaryExpr(c

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1import "fmt"2import "go/ast"3import "go/parser"4import "go/token"5import "os"6import "strings"7func main() {8 fset := token.NewFileSet()9 f, err := parser.ParseFile(fset, os.Args[1], nil, parser.ParseComments)10 if err != nil {11 fmt.Println(err)12 }13 ast.Inspect(f, func(n ast.Node) bool {14 switch x := n.(type) {15 if sel, ok := x.Fun.(*ast.SelectorExpr); ok {16 if id, ok := sel.X.(*ast.Ident); ok {17 if id.Name == "fmt" && sel.Sel.Name == "Println" {18 if len(x.Args) == 1 {19 if lit, ok := x.Args[0].(*ast.BasicLit); ok {20 if lit.Kind == token.STRING {21 lit.Value = strings.Replace(lit.Value, ",", ", ", -1)22 }23 }24 }25 }26 }27 }28 }29 })30 ast.Print(fset, f)31}32import "fmt"33import "go/ast"34import "go/parser"35import "go/token"36import "os"37import "strings"38func main() {39 fset := token.NewFileSet()40 f, err := parser.ParseFile(fset, os.Args[1], nil, parser.ParseComments)41 if err != nil {42 fmt.Println(err)43 }44 ast.Inspect(f, func(n ast.Node) bool {45 switch x := n.(type) {46 if sel, ok := x.Fun.(*ast.SelectorExpr); ok {47 if id, ok := sel.X.(*ast.Ident); ok {48 if id.Name == "fmt" && sel.Sel.Name == "Println" {49 if len(x.Args) == 1 {50 if lit, ok := x.Args[0].(*ast.BasicLit); ok {51 if lit.Kind == token.STRING {52 lit.Value = strings.Replace(lit.Value, ",", ", ", -1)53 }54 }55 }56 }57 }58 }59 }60 })61 ast.Print(fset, f)62}

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