Swc4j AST (Abstract Syntax Tree) visitor is a design pattern used to process the nodes of an AST in a structured way.
There are typically two ways to implement a visitor.
- Extend the built-in abstract class
Swc4jAstVisitor. This is a light-weight, but less flexible way. - Implement the built-in interface
ISwc4jAstVisitorfrom scratch. This is a heavy, but more flexible way.
This tutorial demonstrates how to visit the AST in a Parse output.
This tutorial demonstrates how to update the AST on-the-fly via a plugin.
The following AST nodes are supported.
| A-I | J-S | T | U-Z |
|---|---|---|---|
| ArrayLit | JsxAttr | TaggedTpl | UnaryExpr |
| ArrayPat | JsxClosingElement | ThisExpr | UpdateExpr |
| ArrowExpr | JsxClosingFragment | ThrowStmt | UsingDecl |
| AssignExpr | JsxElement | Tpl | VarDecl |
| AssignPat | JsxEmptyExpr | TplElement | VarDeclarator |
| AssignPatProp | JsxExprContainer | TryStmt | WhileStmt |
| AssignProp | JsxFragment | TsArrayType | WithStmt |
| AutoAccessor | JsxMemberExpr | TsAsExpr | YieldExpr |
| AwaitExpr | JsxNamespacedName | TsCallSignatureDecl | |
| BigInt | JsxOpeningElement | TsConditionalType | |
| BindingIdent | JsxOpeningFragment | TsConstAssertion | |
| BinExpr | JsxSpreadChild | TsConstructorType | |
| BlockStmt | JsxText | TsConstructSignatureDecl | |
| Bool | KeyValuePatProp | TsEnumDecl | |
| BreakStmt | KeyValueProp | TsEnumMember | |
| CallExpr | LabeledStmt | TsExportAssignment | |
| CatchClause | MemberExpr | TsExprWithTypeArgs | |
| Class | MetaPropExpr | TsExternalModuleRef | |
| ClassDecl | MethodProp | TsFnType | |
| ClassExpr | Module | TsGetterSignature | |
| ClassMethod | NamedExport | TsImportEqualsDecl | |
| ClassProp | NewExpr | TsImportType | |
| ComputedPropName | Null | TsIndexedAccessType | |
| CondExpr | Number | TsIndexSignature | |
| Constructor | ObjectLit | TsInferType | |
| ContinueStmt | ObjectPat | TsInstantiation | |
| DebuggerStmt | OptCall | TsInterfaceBody | |
| Decorator | OptChainExpr | TsInterfaceDecl | |
| DoWhileStmt | Param | TsIntersectionType | |
| EmptyStmt | ParenExpr | TsKeywordType | |
| ExportAll | PrivateMethod | TsLitType | |
| ExportDecl | PrivateName | TsMappedType | |
| ExportDefaultDecl | PrivateProp | TsMethodSignature | |
| ExportDefaultExpr | Regex | TsModuleBlock | |
| ExportDefaultSpecifier | RestPat | TsModuleDecl | |
| ExportNamedSpecifier | ReturnStmt | TsNamespaceDecl | |
| ExportNamespaceSpecifier | Script | TsNamespaceExportDecl | |
| ExprOrSpread | SeqExpr | TsNonNullExpr | |
| ExprStmt | SetterProp | TsOptionalType | |
| FnDecl | SpreadElement | TsParamProp | |
| FnExpr | StaticBlock | TsParenthesizedType | |
| ForInStmt | Str | TsPropertySignature | |
| ForOfStmt | Super | TsQualifiedName | |
| ForStmt | SuperPropExpr | TsRestType | |
| Function | SwitchCase | TsSatisfiesExpr | |
| GetterProp | SwitchStmt | TsSetterSignature | |
| Ident | TsThisType | ||
| IfStmt | TsTplLitType | ||
| Import | TsTupleElement | ||
| ImportDecl | TsTupleType | ||
| ImportDefaultSpecifier | TsTypeAliasDecl | ||
| ImportNamedSpecifier | TsTypeAnn | ||
| ImportStarAsSpecifier | TsTypeAssertion | ||
| Invalid | TsTypeLit | ||
| TsTypeOperator | |||
| TsTypeParam | |||
| TsTypeParamDecl | |||
| TsTypeParamInstantiation | |||
| TsTypePredicate | |||
| TsTypeQuery | |||
| TsTypeRef | |||
| TsUnionType |