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visitor.ts
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1408 lines (1185 loc) · 73.9 KB
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/// <reference path="checker.ts" />
/// <reference path="factory.ts" />
/// <reference path="utilities.ts" />
namespace ts {
/**
* Visits a Node using the supplied visitor, possibly returning a new Node in its place.
*
* @param node The Node to visit.
* @param visitor The callback used to visit the Node.
* @param test A callback to execute to verify the Node is valid.
* @param lift An optional callback to execute to lift a NodeArray into a valid Node.
*/
export function visitNode<T extends Node>(node: T, visitor: Visitor, test?: (node: Node) => boolean, lift?: (node: NodeArray<Node>) => T): T;
/**
* Visits a Node using the supplied visitor, possibly returning a new Node in its place.
*
* @param node The Node to visit.
* @param visitor The callback used to visit the Node.
* @param test A callback to execute to verify the Node is valid.
* @param lift An optional callback to execute to lift a NodeArray into a valid Node.
*/
export function visitNode<T extends Node>(node: T | undefined, visitor: Visitor, test?: (node: Node) => boolean, lift?: (node: NodeArray<Node>) => T): T | undefined;
export function visitNode<T extends Node>(node: T | undefined, visitor: Visitor, test?: (node: Node) => boolean, lift?: (node: NodeArray<Node>) => T): T | undefined {
if (node === undefined || visitor === undefined) {
return node;
}
aggregateTransformFlags(node);
const visited = visitor(node);
if (visited === node) {
return node;
}
let visitedNode: Node;
if (visited === undefined) {
return undefined;
}
else if (isArray(visited)) {
visitedNode = (lift || extractSingleNode)(visited);
}
else {
visitedNode = visited;
}
Debug.assertNode(visitedNode, test);
aggregateTransformFlags(visitedNode);
return <T>visitedNode;
}
/**
* Visits a NodeArray using the supplied visitor, possibly returning a new NodeArray in its place.
*
* @param nodes The NodeArray to visit.
* @param visitor The callback used to visit a Node.
* @param test A node test to execute for each node.
* @param start An optional value indicating the starting offset at which to start visiting.
* @param count An optional value indicating the maximum number of nodes to visit.
*/
export function visitNodes<T extends Node>(nodes: NodeArray<T>, visitor: Visitor, test?: (node: Node) => boolean, start?: number, count?: number): NodeArray<T>;
/**
* Visits a NodeArray using the supplied visitor, possibly returning a new NodeArray in its place.
*
* @param nodes The NodeArray to visit.
* @param visitor The callback used to visit a Node.
* @param test A node test to execute for each node.
* @param start An optional value indicating the starting offset at which to start visiting.
* @param count An optional value indicating the maximum number of nodes to visit.
*/
export function visitNodes<T extends Node>(nodes: NodeArray<T> | undefined, visitor: Visitor, test?: (node: Node) => boolean, start?: number, count?: number): NodeArray<T> | undefined;
/**
* Visits a NodeArray using the supplied visitor, possibly returning a new NodeArray in its place.
*
* @param nodes The NodeArray to visit.
* @param visitor The callback used to visit a Node.
* @param test A node test to execute for each node.
* @param start An optional value indicating the starting offset at which to start visiting.
* @param count An optional value indicating the maximum number of nodes to visit.
*/
export function visitNodes<T extends Node>(nodes: NodeArray<T> | undefined, visitor: Visitor, test?: (node: Node) => boolean, start?: number, count?: number): NodeArray<T> | undefined {
if (nodes === undefined || visitor === undefined) {
return nodes;
}
let updated: NodeArray<T>;
// Ensure start and count have valid values
const length = nodes.length;
if (start === undefined || start < 0) {
start = 0;
}
if (count === undefined || count > length - start) {
count = length - start;
}
if (start > 0 || count < length) {
// If we are not visiting all of the original nodes, we must always create a new array.
// Since this is a fragment of a node array, we do not copy over the previous location
// and will only copy over `hasTrailingComma` if we are including the last element.
updated = createNodeArray<T>([], /*hasTrailingComma*/ nodes.hasTrailingComma && start + count === length);
}
// Visit each original node.
for (let i = 0; i < count; i++) {
const node = nodes[i + start];
aggregateTransformFlags(node);
const visited = node !== undefined ? visitor(node) : undefined;
if (updated !== undefined || visited === undefined || visited !== node) {
if (updated === undefined) {
// Ensure we have a copy of `nodes`, up to the current index.
updated = createNodeArray(nodes.slice(0, i), nodes.hasTrailingComma);
setTextRange(updated, nodes);
}
if (visited) {
if (isArray(visited)) {
for (const visitedNode of visited) {
Debug.assertNode(visitedNode, test);
aggregateTransformFlags(visitedNode);
updated.push(<T>visitedNode);
}
}
else {
Debug.assertNode(visited, test);
aggregateTransformFlags(visited);
updated.push(<T>visited);
}
}
}
}
return updated || nodes;
}
/**
* Starts a new lexical environment and visits a statement list, ending the lexical environment
* and merging hoisted declarations upon completion.
*/
export function visitLexicalEnvironment(statements: NodeArray<Statement>, visitor: Visitor, context: TransformationContext, start?: number, ensureUseStrict?: boolean) {
context.startLexicalEnvironment();
statements = visitNodes(statements, visitor, isStatement, start);
if (ensureUseStrict && !startsWithUseStrict(statements)) {
statements = setTextRange(createNodeArray([createStatement(createLiteral("use strict")), ...statements]), statements);
}
const declarations = context.endLexicalEnvironment();
return setTextRange(createNodeArray(concatenate(statements, declarations)), statements);
}
/**
* Starts a new lexical environment and visits a parameter list, suspending the lexical
* environment upon completion.
*/
export function visitParameterList(nodes: NodeArray<ParameterDeclaration>, visitor: Visitor, context: TransformationContext) {
context.startLexicalEnvironment();
const updated = visitNodes(nodes, visitor, isParameterDeclaration);
context.suspendLexicalEnvironment();
return updated;
}
/**
* Resumes a suspended lexical environment and visits a function body, ending the lexical
* environment and merging hoisted declarations upon completion.
*/
export function visitFunctionBody(node: FunctionBody, visitor: Visitor, context: TransformationContext): FunctionBody;
/**
* Resumes a suspended lexical environment and visits a function body, ending the lexical
* environment and merging hoisted declarations upon completion.
*/
export function visitFunctionBody(node: FunctionBody | undefined, visitor: Visitor, context: TransformationContext): FunctionBody | undefined;
/**
* Resumes a suspended lexical environment and visits a concise body, ending the lexical
* environment and merging hoisted declarations upon completion.
*/
export function visitFunctionBody(node: ConciseBody, visitor: Visitor, context: TransformationContext): ConciseBody;
export function visitFunctionBody(node: ConciseBody, visitor: Visitor, context: TransformationContext): ConciseBody {
context.resumeLexicalEnvironment();
const updated = visitNode(node, visitor, isConciseBody);
const declarations = context.endLexicalEnvironment();
if (some(declarations)) {
const block = convertToFunctionBody(updated);
const statements = mergeLexicalEnvironment(block.statements, declarations);
return updateBlock(block, statements);
}
return updated;
}
/**
* Visits each child of a Node using the supplied visitor, possibly returning a new Node of the same kind in its place.
*
* @param node The Node whose children will be visited.
* @param visitor The callback used to visit each child.
* @param context A lexical environment context for the visitor.
*/
export function visitEachChild<T extends Node>(node: T, visitor: Visitor, context: TransformationContext): T;
/**
* Visits each child of a Node using the supplied visitor, possibly returning a new Node of the same kind in its place.
*
* @param node The Node whose children will be visited.
* @param visitor The callback used to visit each child.
* @param context A lexical environment context for the visitor.
*/
export function visitEachChild<T extends Node>(node: T | undefined, visitor: Visitor, context: TransformationContext): T | undefined;
export function visitEachChild(node: Node, visitor: Visitor, context: TransformationContext): Node {
if (node === undefined) {
return undefined;
}
const kind = node.kind;
// No need to visit nodes with no children.
if ((kind > SyntaxKind.FirstToken && kind <= SyntaxKind.LastToken)) {
return node;
}
// We do not yet support types.
if ((kind >= SyntaxKind.TypePredicate && kind <= SyntaxKind.LiteralType)) {
return node;
}
switch (node.kind) {
case SyntaxKind.SemicolonClassElement:
case SyntaxKind.EmptyStatement:
case SyntaxKind.OmittedExpression:
case SyntaxKind.DebuggerStatement:
// No need to visit nodes with no children.
return node;
// Names
case SyntaxKind.QualifiedName:
return updateQualifiedName(<QualifiedName>node,
visitNode((<QualifiedName>node).left, visitor, isEntityName),
visitNode((<QualifiedName>node).right, visitor, isIdentifier));
case SyntaxKind.ComputedPropertyName:
return updateComputedPropertyName(<ComputedPropertyName>node,
visitNode((<ComputedPropertyName>node).expression, visitor, isExpression));
// Signature elements
case SyntaxKind.Parameter:
return updateParameter(<ParameterDeclaration>node,
visitNodes((<ParameterDeclaration>node).decorators, visitor, isDecorator),
visitNodes((<ParameterDeclaration>node).modifiers, visitor, isModifier),
(<ParameterDeclaration>node).dotDotDotToken,
visitNode((<ParameterDeclaration>node).name, visitor, isBindingName),
visitNode((<ParameterDeclaration>node).type, visitor, isTypeNode),
visitNode((<ParameterDeclaration>node).initializer, visitor, isExpression));
case SyntaxKind.Decorator:
return updateDecorator(<Decorator>node,
visitNode((<Decorator>node).expression, visitor, isExpression));
// Type member
case SyntaxKind.PropertyDeclaration:
return updateProperty(<PropertyDeclaration>node,
visitNodes((<PropertyDeclaration>node).decorators, visitor, isDecorator),
visitNodes((<PropertyDeclaration>node).modifiers, visitor, isModifier),
visitNode((<PropertyDeclaration>node).name, visitor, isPropertyName),
visitNode((<PropertyDeclaration>node).type, visitor, isTypeNode),
visitNode((<PropertyDeclaration>node).initializer, visitor, isExpression));
case SyntaxKind.MethodDeclaration:
return updateMethod(<MethodDeclaration>node,
visitNodes((<MethodDeclaration>node).decorators, visitor, isDecorator),
visitNodes((<MethodDeclaration>node).modifiers, visitor, isModifier),
(<MethodDeclaration>node).asteriskToken,
visitNode((<MethodDeclaration>node).name, visitor, isPropertyName),
visitNodes((<MethodDeclaration>node).typeParameters, visitor, isTypeParameter),
visitParameterList((<MethodDeclaration>node).parameters, visitor, context),
visitNode((<MethodDeclaration>node).type, visitor, isTypeNode),
visitFunctionBody((<MethodDeclaration>node).body, visitor, context));
case SyntaxKind.Constructor:
return updateConstructor(<ConstructorDeclaration>node,
visitNodes((<ConstructorDeclaration>node).decorators, visitor, isDecorator),
visitNodes((<ConstructorDeclaration>node).modifiers, visitor, isModifier),
visitParameterList((<ConstructorDeclaration>node).parameters, visitor, context),
visitFunctionBody((<ConstructorDeclaration>node).body, visitor, context));
case SyntaxKind.GetAccessor:
return updateGetAccessor(<GetAccessorDeclaration>node,
visitNodes((<GetAccessorDeclaration>node).decorators, visitor, isDecorator),
visitNodes((<GetAccessorDeclaration>node).modifiers, visitor, isModifier),
visitNode((<GetAccessorDeclaration>node).name, visitor, isPropertyName),
visitParameterList((<GetAccessorDeclaration>node).parameters, visitor, context),
visitNode((<GetAccessorDeclaration>node).type, visitor, isTypeNode),
visitFunctionBody((<GetAccessorDeclaration>node).body, visitor, context));
case SyntaxKind.SetAccessor:
return updateSetAccessor(<SetAccessorDeclaration>node,
visitNodes((<SetAccessorDeclaration>node).decorators, visitor, isDecorator),
visitNodes((<SetAccessorDeclaration>node).modifiers, visitor, isModifier),
visitNode((<SetAccessorDeclaration>node).name, visitor, isPropertyName),
visitParameterList((<SetAccessorDeclaration>node).parameters, visitor, context),
visitFunctionBody((<SetAccessorDeclaration>node).body, visitor, context));
// Binding patterns
case SyntaxKind.ObjectBindingPattern:
return updateObjectBindingPattern(<ObjectBindingPattern>node,
visitNodes((<ObjectBindingPattern>node).elements, visitor, isBindingElement));
case SyntaxKind.ArrayBindingPattern:
return updateArrayBindingPattern(<ArrayBindingPattern>node,
visitNodes((<ArrayBindingPattern>node).elements, visitor, isArrayBindingElement));
case SyntaxKind.BindingElement:
return updateBindingElement(<BindingElement>node,
(<BindingElement>node).dotDotDotToken,
visitNode((<BindingElement>node).propertyName, visitor, isPropertyName),
visitNode((<BindingElement>node).name, visitor, isBindingName),
visitNode((<BindingElement>node).initializer, visitor, isExpression));
// Expression
case SyntaxKind.ArrayLiteralExpression:
return updateArrayLiteral(<ArrayLiteralExpression>node,
visitNodes((<ArrayLiteralExpression>node).elements, visitor, isExpression));
case SyntaxKind.ObjectLiteralExpression:
return updateObjectLiteral(<ObjectLiteralExpression>node,
visitNodes((<ObjectLiteralExpression>node).properties, visitor, isObjectLiteralElementLike));
case SyntaxKind.PropertyAccessExpression:
return updatePropertyAccess(<PropertyAccessExpression>node,
visitNode((<PropertyAccessExpression>node).expression, visitor, isExpression),
visitNode((<PropertyAccessExpression>node).name, visitor, isIdentifier));
case SyntaxKind.ElementAccessExpression:
return updateElementAccess(<ElementAccessExpression>node,
visitNode((<ElementAccessExpression>node).expression, visitor, isExpression),
visitNode((<ElementAccessExpression>node).argumentExpression, visitor, isExpression));
case SyntaxKind.CallExpression:
return updateCall(<CallExpression>node,
visitNode((<CallExpression>node).expression, visitor, isExpression),
visitNodes((<CallExpression>node).typeArguments, visitor, isTypeNode),
visitNodes((<CallExpression>node).arguments, visitor, isExpression));
case SyntaxKind.NewExpression:
return updateNew(<NewExpression>node,
visitNode((<NewExpression>node).expression, visitor, isExpression),
visitNodes((<NewExpression>node).typeArguments, visitor, isTypeNode),
visitNodes((<NewExpression>node).arguments, visitor, isExpression));
case SyntaxKind.TaggedTemplateExpression:
return updateTaggedTemplate(<TaggedTemplateExpression>node,
visitNode((<TaggedTemplateExpression>node).tag, visitor, isExpression),
visitNode((<TaggedTemplateExpression>node).template, visitor, isTemplateLiteral));
case SyntaxKind.TypeAssertionExpression:
return updateTypeAssertion(<TypeAssertion>node,
visitNode((<TypeAssertion>node).type, visitor, isTypeNode),
visitNode((<TypeAssertion>node).expression, visitor, isExpression));
case SyntaxKind.ParenthesizedExpression:
return updateParen(<ParenthesizedExpression>node,
visitNode((<ParenthesizedExpression>node).expression, visitor, isExpression));
case SyntaxKind.FunctionExpression:
return updateFunctionExpression(<FunctionExpression>node,
visitNodes((<FunctionExpression>node).modifiers, visitor, isModifier),
(<FunctionExpression>node).asteriskToken,
visitNode((<FunctionExpression>node).name, visitor, isIdentifier),
visitNodes((<FunctionExpression>node).typeParameters, visitor, isTypeParameter),
visitParameterList((<FunctionExpression>node).parameters, visitor, context),
visitNode((<FunctionExpression>node).type, visitor, isTypeNode),
visitFunctionBody((<FunctionExpression>node).body, visitor, context));
case SyntaxKind.ArrowFunction:
return updateArrowFunction(<ArrowFunction>node,
visitNodes((<ArrowFunction>node).modifiers, visitor, isModifier),
visitNodes((<ArrowFunction>node).typeParameters, visitor, isTypeParameter),
visitParameterList((<ArrowFunction>node).parameters, visitor, context),
visitNode((<ArrowFunction>node).type, visitor, isTypeNode),
visitFunctionBody((<ArrowFunction>node).body, visitor, context));
case SyntaxKind.DeleteExpression:
return updateDelete(<DeleteExpression>node,
visitNode((<DeleteExpression>node).expression, visitor, isExpression));
case SyntaxKind.TypeOfExpression:
return updateTypeOf(<TypeOfExpression>node,
visitNode((<TypeOfExpression>node).expression, visitor, isExpression));
case SyntaxKind.VoidExpression:
return updateVoid(<VoidExpression>node,
visitNode((<VoidExpression>node).expression, visitor, isExpression));
case SyntaxKind.AwaitExpression:
return updateAwait(<AwaitExpression>node,
visitNode((<AwaitExpression>node).expression, visitor, isExpression));
case SyntaxKind.BinaryExpression:
return updateBinary(<BinaryExpression>node,
visitNode((<BinaryExpression>node).left, visitor, isExpression),
visitNode((<BinaryExpression>node).right, visitor, isExpression));
case SyntaxKind.PrefixUnaryExpression:
return updatePrefix(<PrefixUnaryExpression>node,
visitNode((<PrefixUnaryExpression>node).operand, visitor, isExpression));
case SyntaxKind.PostfixUnaryExpression:
return updatePostfix(<PostfixUnaryExpression>node,
visitNode((<PostfixUnaryExpression>node).operand, visitor, isExpression));
case SyntaxKind.ConditionalExpression:
return updateConditional(<ConditionalExpression>node,
visitNode((<ConditionalExpression>node).condition, visitor, isExpression),
visitNode((<ConditionalExpression>node).whenTrue, visitor, isExpression),
visitNode((<ConditionalExpression>node).whenFalse, visitor, isExpression));
case SyntaxKind.TemplateExpression:
return updateTemplateExpression(<TemplateExpression>node,
visitNode((<TemplateExpression>node).head, visitor, isTemplateHead),
visitNodes((<TemplateExpression>node).templateSpans, visitor, isTemplateSpan));
case SyntaxKind.YieldExpression:
return updateYield(<YieldExpression>node,
(<YieldExpression>node).asteriskToken,
visitNode((<YieldExpression>node).expression, visitor, isExpression));
case SyntaxKind.SpreadElement:
return updateSpread(<SpreadElement>node,
visitNode((<SpreadElement>node).expression, visitor, isExpression));
case SyntaxKind.ClassExpression:
return updateClassExpression(<ClassExpression>node,
visitNodes((<ClassExpression>node).modifiers, visitor, isModifier),
visitNode((<ClassExpression>node).name, visitor, isIdentifier),
visitNodes((<ClassExpression>node).typeParameters, visitor, isTypeParameter),
visitNodes((<ClassExpression>node).heritageClauses, visitor, isHeritageClause),
visitNodes((<ClassExpression>node).members, visitor, isClassElement));
case SyntaxKind.ExpressionWithTypeArguments:
return updateExpressionWithTypeArguments(<ExpressionWithTypeArguments>node,
visitNodes((<ExpressionWithTypeArguments>node).typeArguments, visitor, isTypeNode),
visitNode((<ExpressionWithTypeArguments>node).expression, visitor, isExpression));
case SyntaxKind.AsExpression:
return updateAsExpression(<AsExpression>node,
visitNode((<AsExpression>node).expression, visitor, isExpression),
visitNode((<AsExpression>node).type, visitor, isTypeNode));
case SyntaxKind.NonNullExpression:
return updateNonNullExpression(<NonNullExpression>node,
visitNode((<NonNullExpression>node).expression, visitor, isExpression));
// Misc
case SyntaxKind.TemplateSpan:
return updateTemplateSpan(<TemplateSpan>node,
visitNode((<TemplateSpan>node).expression, visitor, isExpression),
visitNode((<TemplateSpan>node).literal, visitor, isTemplateMiddleOrTemplateTail));
// Element
case SyntaxKind.Block:
return updateBlock(<Block>node,
visitNodes((<Block>node).statements, visitor, isStatement));
case SyntaxKind.VariableStatement:
return updateVariableStatement(<VariableStatement>node,
visitNodes((<VariableStatement>node).modifiers, visitor, isModifier),
visitNode((<VariableStatement>node).declarationList, visitor, isVariableDeclarationList));
case SyntaxKind.ExpressionStatement:
return updateStatement(<ExpressionStatement>node,
visitNode((<ExpressionStatement>node).expression, visitor, isExpression));
case SyntaxKind.IfStatement:
return updateIf(<IfStatement>node,
visitNode((<IfStatement>node).expression, visitor, isExpression),
visitNode((<IfStatement>node).thenStatement, visitor, isStatement, liftToBlock),
visitNode((<IfStatement>node).elseStatement, visitor, isStatement, liftToBlock));
case SyntaxKind.DoStatement:
return updateDo(<DoStatement>node,
visitNode((<DoStatement>node).statement, visitor, isStatement, liftToBlock),
visitNode((<DoStatement>node).expression, visitor, isExpression));
case SyntaxKind.WhileStatement:
return updateWhile(<WhileStatement>node,
visitNode((<WhileStatement>node).expression, visitor, isExpression),
visitNode((<WhileStatement>node).statement, visitor, isStatement, liftToBlock));
case SyntaxKind.ForStatement:
return updateFor(<ForStatement>node,
visitNode((<ForStatement>node).initializer, visitor, isForInitializer),
visitNode((<ForStatement>node).condition, visitor, isExpression),
visitNode((<ForStatement>node).incrementor, visitor, isExpression),
visitNode((<ForStatement>node).statement, visitor, isStatement, liftToBlock));
case SyntaxKind.ForInStatement:
return updateForIn(<ForInStatement>node,
visitNode((<ForInStatement>node).initializer, visitor, isForInitializer),
visitNode((<ForInStatement>node).expression, visitor, isExpression),
visitNode((<ForInStatement>node).statement, visitor, isStatement, liftToBlock));
case SyntaxKind.ForOfStatement:
return updateForOf(<ForOfStatement>node,
(<ForOfStatement>node).awaitModifier,
visitNode((<ForOfStatement>node).initializer, visitor, isForInitializer),
visitNode((<ForOfStatement>node).expression, visitor, isExpression),
visitNode((<ForOfStatement>node).statement, visitor, isStatement, liftToBlock));
case SyntaxKind.ContinueStatement:
return updateContinue(<ContinueStatement>node,
visitNode((<ContinueStatement>node).label, visitor, isIdentifier));
case SyntaxKind.BreakStatement:
return updateBreak(<BreakStatement>node,
visitNode((<BreakStatement>node).label, visitor, isIdentifier));
case SyntaxKind.ReturnStatement:
return updateReturn(<ReturnStatement>node,
visitNode((<ReturnStatement>node).expression, visitor, isExpression));
case SyntaxKind.WithStatement:
return updateWith(<WithStatement>node,
visitNode((<WithStatement>node).expression, visitor, isExpression),
visitNode((<WithStatement>node).statement, visitor, isStatement, liftToBlock));
case SyntaxKind.SwitchStatement:
return updateSwitch(<SwitchStatement>node,
visitNode((<SwitchStatement>node).expression, visitor, isExpression),
visitNode((<SwitchStatement>node).caseBlock, visitor, isCaseBlock));
case SyntaxKind.LabeledStatement:
return updateLabel(<LabeledStatement>node,
visitNode((<LabeledStatement>node).label, visitor, isIdentifier),
visitNode((<LabeledStatement>node).statement, visitor, isStatement, liftToBlock));
case SyntaxKind.ThrowStatement:
return updateThrow(<ThrowStatement>node,
visitNode((<ThrowStatement>node).expression, visitor, isExpression));
case SyntaxKind.TryStatement:
return updateTry(<TryStatement>node,
visitNode((<TryStatement>node).tryBlock, visitor, isBlock),
visitNode((<TryStatement>node).catchClause, visitor, isCatchClause),
visitNode((<TryStatement>node).finallyBlock, visitor, isBlock));
case SyntaxKind.VariableDeclaration:
return updateVariableDeclaration(<VariableDeclaration>node,
visitNode((<VariableDeclaration>node).name, visitor, isBindingName),
visitNode((<VariableDeclaration>node).type, visitor, isTypeNode),
visitNode((<VariableDeclaration>node).initializer, visitor, isExpression));
case SyntaxKind.VariableDeclarationList:
return updateVariableDeclarationList(<VariableDeclarationList>node,
visitNodes((<VariableDeclarationList>node).declarations, visitor, isVariableDeclaration));
case SyntaxKind.FunctionDeclaration:
return updateFunctionDeclaration(<FunctionDeclaration>node,
visitNodes((<FunctionDeclaration>node).decorators, visitor, isDecorator),
visitNodes((<FunctionDeclaration>node).modifiers, visitor, isModifier),
(<FunctionDeclaration>node).asteriskToken,
visitNode((<FunctionDeclaration>node).name, visitor, isIdentifier),
visitNodes((<FunctionDeclaration>node).typeParameters, visitor, isTypeParameter),
visitParameterList((<FunctionDeclaration>node).parameters, visitor, context),
visitNode((<FunctionDeclaration>node).type, visitor, isTypeNode),
visitFunctionBody((<FunctionExpression>node).body, visitor, context));
case SyntaxKind.ClassDeclaration:
return updateClassDeclaration(<ClassDeclaration>node,
visitNodes((<ClassDeclaration>node).decorators, visitor, isDecorator),
visitNodes((<ClassDeclaration>node).modifiers, visitor, isModifier),
visitNode((<ClassDeclaration>node).name, visitor, isIdentifier),
visitNodes((<ClassDeclaration>node).typeParameters, visitor, isTypeParameter),
visitNodes((<ClassDeclaration>node).heritageClauses, visitor, isHeritageClause),
visitNodes((<ClassDeclaration>node).members, visitor, isClassElement));
case SyntaxKind.EnumDeclaration:
return updateEnumDeclaration(<EnumDeclaration>node,
visitNodes((<EnumDeclaration>node).decorators, visitor, isDecorator),
visitNodes((<EnumDeclaration>node).modifiers, visitor, isModifier),
visitNode((<EnumDeclaration>node).name, visitor, isIdentifier),
visitNodes((<EnumDeclaration>node).members, visitor, isEnumMember));
case SyntaxKind.ModuleDeclaration:
return updateModuleDeclaration(<ModuleDeclaration>node,
visitNodes((<ModuleDeclaration>node).decorators, visitor, isDecorator),
visitNodes((<ModuleDeclaration>node).modifiers, visitor, isModifier),
visitNode((<ModuleDeclaration>node).name, visitor, isIdentifier),
visitNode((<ModuleDeclaration>node).body, visitor, isModuleBody));
case SyntaxKind.ModuleBlock:
return updateModuleBlock(<ModuleBlock>node,
visitNodes((<ModuleBlock>node).statements, visitor, isStatement));
case SyntaxKind.CaseBlock:
return updateCaseBlock(<CaseBlock>node,
visitNodes((<CaseBlock>node).clauses, visitor, isCaseOrDefaultClause));
case SyntaxKind.ImportEqualsDeclaration:
return updateImportEqualsDeclaration(<ImportEqualsDeclaration>node,
visitNodes((<ImportEqualsDeclaration>node).decorators, visitor, isDecorator),
visitNodes((<ImportEqualsDeclaration>node).modifiers, visitor, isModifier),
visitNode((<ImportEqualsDeclaration>node).name, visitor, isIdentifier),
visitNode((<ImportEqualsDeclaration>node).moduleReference, visitor, isModuleReference));
case SyntaxKind.ImportDeclaration:
return updateImportDeclaration(<ImportDeclaration>node,
visitNodes((<ImportDeclaration>node).decorators, visitor, isDecorator),
visitNodes((<ImportDeclaration>node).modifiers, visitor, isModifier),
visitNode((<ImportDeclaration>node).importClause, visitor, isImportClause),
visitNode((<ImportDeclaration>node).moduleSpecifier, visitor, isExpression));
case SyntaxKind.ImportClause:
return updateImportClause(<ImportClause>node,
visitNode((<ImportClause>node).name, visitor, isIdentifier),
visitNode((<ImportClause>node).namedBindings, visitor, isNamedImportBindings));
case SyntaxKind.NamespaceImport:
return updateNamespaceImport(<NamespaceImport>node,
visitNode((<NamespaceImport>node).name, visitor, isIdentifier));
case SyntaxKind.NamedImports:
return updateNamedImports(<NamedImports>node,
visitNodes((<NamedImports>node).elements, visitor, isImportSpecifier));
case SyntaxKind.ImportSpecifier:
return updateImportSpecifier(<ImportSpecifier>node,
visitNode((<ImportSpecifier>node).propertyName, visitor, isIdentifier),
visitNode((<ImportSpecifier>node).name, visitor, isIdentifier));
case SyntaxKind.ExportAssignment:
return updateExportAssignment(<ExportAssignment>node,
visitNodes((<ExportAssignment>node).decorators, visitor, isDecorator),
visitNodes((<ExportAssignment>node).modifiers, visitor, isModifier),
visitNode((<ExportAssignment>node).expression, visitor, isExpression));
case SyntaxKind.ExportDeclaration:
return updateExportDeclaration(<ExportDeclaration>node,
visitNodes((<ExportDeclaration>node).decorators, visitor, isDecorator),
visitNodes((<ExportDeclaration>node).modifiers, visitor, isModifier),
visitNode((<ExportDeclaration>node).exportClause, visitor, isNamedExports),
visitNode((<ExportDeclaration>node).moduleSpecifier, visitor, isExpression));
case SyntaxKind.NamedExports:
return updateNamedExports(<NamedExports>node,
visitNodes((<NamedExports>node).elements, visitor, isExportSpecifier));
case SyntaxKind.ExportSpecifier:
return updateExportSpecifier(<ExportSpecifier>node,
visitNode((<ExportSpecifier>node).propertyName, visitor, isIdentifier),
visitNode((<ExportSpecifier>node).name, visitor, isIdentifier));
// Module references
case SyntaxKind.ExternalModuleReference:
return updateExternalModuleReference(<ExternalModuleReference>node,
visitNode((<ExternalModuleReference>node).expression, visitor, isExpression));
// JSX
case SyntaxKind.JsxElement:
return updateJsxElement(<JsxElement>node,
visitNode((<JsxElement>node).openingElement, visitor, isJsxOpeningElement),
visitNodes((<JsxElement>node).children, visitor, isJsxChild),
visitNode((<JsxElement>node).closingElement, visitor, isJsxClosingElement));
case SyntaxKind.JsxAttributes:
return updateJsxAttributes(<JsxAttributes>node,
visitNodes((<JsxAttributes>node).properties, visitor, isJsxAttributeLike));
case SyntaxKind.JsxSelfClosingElement:
return updateJsxSelfClosingElement(<JsxSelfClosingElement>node,
visitNode((<JsxSelfClosingElement>node).tagName, visitor, isJsxTagNameExpression),
visitNode((<JsxSelfClosingElement>node).attributes, visitor, isJsxAttributes));
case SyntaxKind.JsxOpeningElement:
return updateJsxOpeningElement(<JsxOpeningElement>node,
visitNode((<JsxOpeningElement>node).tagName, visitor, isJsxTagNameExpression),
visitNode((<JsxOpeningElement>node).attributes, visitor, isJsxAttributes));
case SyntaxKind.JsxClosingElement:
return updateJsxClosingElement(<JsxClosingElement>node,
visitNode((<JsxClosingElement>node).tagName, visitor, isJsxTagNameExpression));
case SyntaxKind.JsxAttribute:
return updateJsxAttribute(<JsxAttribute>node,
visitNode((<JsxAttribute>node).name, visitor, isIdentifier),
visitNode((<JsxAttribute>node).initializer, visitor, isStringLiteralOrJsxExpression));
case SyntaxKind.JsxSpreadAttribute:
return updateJsxSpreadAttribute(<JsxSpreadAttribute>node,
visitNode((<JsxSpreadAttribute>node).expression, visitor, isExpression));
case SyntaxKind.JsxExpression:
return updateJsxExpression(<JsxExpression>node,
visitNode((<JsxExpression>node).expression, visitor, isExpression));
// Clauses
case SyntaxKind.CaseClause:
return updateCaseClause(<CaseClause>node,
visitNode((<CaseClause>node).expression, visitor, isExpression),
visitNodes((<CaseClause>node).statements, visitor, isStatement));
case SyntaxKind.DefaultClause:
return updateDefaultClause(<DefaultClause>node,
visitNodes((<DefaultClause>node).statements, visitor, isStatement));
case SyntaxKind.HeritageClause:
return updateHeritageClause(<HeritageClause>node,
visitNodes((<HeritageClause>node).types, visitor, isExpressionWithTypeArguments));
case SyntaxKind.CatchClause:
return updateCatchClause(<CatchClause>node,
visitNode((<CatchClause>node).variableDeclaration, visitor, isVariableDeclaration),
visitNode((<CatchClause>node).block, visitor, isBlock));
// Property assignments
case SyntaxKind.PropertyAssignment:
return updatePropertyAssignment(<PropertyAssignment>node,
visitNode((<PropertyAssignment>node).name, visitor, isPropertyName),
visitNode((<PropertyAssignment>node).initializer, visitor, isExpression));
case SyntaxKind.ShorthandPropertyAssignment:
return updateShorthandPropertyAssignment(<ShorthandPropertyAssignment>node,
visitNode((<ShorthandPropertyAssignment>node).name, visitor, isIdentifier),
visitNode((<ShorthandPropertyAssignment>node).objectAssignmentInitializer, visitor, isExpression));
case SyntaxKind.SpreadAssignment:
return updateSpreadAssignment(<SpreadAssignment>node,
visitNode((<SpreadAssignment>node).expression, visitor, isExpression));
// Enum
case SyntaxKind.EnumMember:
return updateEnumMember(<EnumMember>node,
visitNode((<EnumMember>node).name, visitor, isPropertyName),
visitNode((<EnumMember>node).initializer, visitor, isExpression));
// Top-level nodes
case SyntaxKind.SourceFile:
return updateSourceFileNode(<SourceFile>node,
visitLexicalEnvironment((<SourceFile>node).statements, visitor, context));
// Transformation nodes
case SyntaxKind.PartiallyEmittedExpression:
return updatePartiallyEmittedExpression(<PartiallyEmittedExpression>node,
visitNode((<PartiallyEmittedExpression>node).expression, visitor, isExpression));
default:
return node;
}
}
/**
* Extracts the single node from a NodeArray.
*
* @param nodes The NodeArray.
*/
function extractSingleNode(nodes: Node[]): Node {
Debug.assert(nodes.length <= 1, "Too many nodes written to output.");
return singleOrUndefined(nodes);
}
}
/* @internal */
namespace ts {
function reduceNode<T>(node: Node, f: (memo: T, node: Node) => T, initial: T) {
return node ? f(initial, node) : initial;
}
function reduceNodeArray<T>(nodes: NodeArray<Node>, f: (memo: T, nodes: NodeArray<Node>) => T, initial: T) {
return nodes ? f(initial, nodes) : initial;
}
/**
* Similar to `reduceLeft`, performs a reduction against each child of a node.
* NOTE: Unlike `forEachChild`, this does *not* visit every node.
*
* @param node The node containing the children to reduce.
* @param initial The initial value to supply to the reduction.
* @param f The callback function
*/
export function reduceEachChild<T>(node: Node, initial: T, cbNode: (memo: T, node: Node) => T, cbNodeArray?: (memo: T, nodes: NodeArray<Node>) => T): T {
if (node === undefined) {
return initial;
}
const reduceNodes: (nodes: NodeArray<Node>, f: (memo: T, node: Node | NodeArray<Node>) => T, initial: T) => T = cbNodeArray ? reduceNodeArray : reduceLeft;
const cbNodes = cbNodeArray || cbNode;
const kind = node.kind;
// No need to visit nodes with no children.
if ((kind > SyntaxKind.FirstToken && kind <= SyntaxKind.LastToken)) {
return initial;
}
// We do not yet support types.
if ((kind >= SyntaxKind.TypePredicate && kind <= SyntaxKind.LiteralType)) {
return initial;
}
let result = initial;
switch (node.kind) {
// Leaf nodes
case SyntaxKind.SemicolonClassElement:
case SyntaxKind.EmptyStatement:
case SyntaxKind.OmittedExpression:
case SyntaxKind.DebuggerStatement:
case SyntaxKind.NotEmittedStatement:
// No need to visit nodes with no children.
break;
// Names
case SyntaxKind.QualifiedName:
result = reduceNode((<QualifiedName>node).left, cbNode, result);
result = reduceNode((<QualifiedName>node).right, cbNode, result);
break;
case SyntaxKind.ComputedPropertyName:
result = reduceNode((<ComputedPropertyName>node).expression, cbNode, result);
break;
// Signature elements
case SyntaxKind.Parameter:
result = reduceNodes((<ParameterDeclaration>node).decorators, cbNodes, result);
result = reduceNodes((<ParameterDeclaration>node).modifiers, cbNodes, result);
result = reduceNode((<ParameterDeclaration>node).name, cbNode, result);
result = reduceNode((<ParameterDeclaration>node).type, cbNode, result);
result = reduceNode((<ParameterDeclaration>node).initializer, cbNode, result);
break;
case SyntaxKind.Decorator:
result = reduceNode((<Decorator>node).expression, cbNode, result);
break;
// Type member
case SyntaxKind.PropertyDeclaration:
result = reduceNodes((<PropertyDeclaration>node).decorators, cbNodes, result);
result = reduceNodes((<PropertyDeclaration>node).modifiers, cbNodes, result);
result = reduceNode((<PropertyDeclaration>node).name, cbNode, result);
result = reduceNode((<PropertyDeclaration>node).type, cbNode, result);
result = reduceNode((<PropertyDeclaration>node).initializer, cbNode, result);
break;
case SyntaxKind.MethodDeclaration:
result = reduceNodes((<MethodDeclaration>node).decorators, cbNodes, result);
result = reduceNodes((<MethodDeclaration>node).modifiers, cbNodes, result);
result = reduceNode((<MethodDeclaration>node).name, cbNode, result);
result = reduceNodes((<MethodDeclaration>node).typeParameters, cbNodes, result);
result = reduceNodes((<MethodDeclaration>node).parameters, cbNodes, result);
result = reduceNode((<MethodDeclaration>node).type, cbNode, result);
result = reduceNode((<MethodDeclaration>node).body, cbNode, result);
break;
case SyntaxKind.Constructor:
result = reduceNodes((<ConstructorDeclaration>node).modifiers, cbNodes, result);
result = reduceNodes((<ConstructorDeclaration>node).parameters, cbNodes, result);
result = reduceNode((<ConstructorDeclaration>node).body, cbNode, result);
break;
case SyntaxKind.GetAccessor:
result = reduceNodes((<GetAccessorDeclaration>node).decorators, cbNodes, result);
result = reduceNodes((<GetAccessorDeclaration>node).modifiers, cbNodes, result);
result = reduceNode((<GetAccessorDeclaration>node).name, cbNode, result);
result = reduceNodes((<GetAccessorDeclaration>node).parameters, cbNodes, result);
result = reduceNode((<GetAccessorDeclaration>node).type, cbNode, result);
result = reduceNode((<GetAccessorDeclaration>node).body, cbNode, result);
break;
case SyntaxKind.SetAccessor:
result = reduceNodes((<GetAccessorDeclaration>node).decorators, cbNodes, result);
result = reduceNodes((<GetAccessorDeclaration>node).modifiers, cbNodes, result);
result = reduceNode((<GetAccessorDeclaration>node).name, cbNode, result);
result = reduceNodes((<GetAccessorDeclaration>node).parameters, cbNodes, result);
result = reduceNode((<GetAccessorDeclaration>node).body, cbNode, result);
break;
// Binding patterns
case SyntaxKind.ObjectBindingPattern:
case SyntaxKind.ArrayBindingPattern:
result = reduceNodes((<BindingPattern>node).elements, cbNodes, result);
break;
case SyntaxKind.BindingElement:
result = reduceNode((<BindingElement>node).propertyName, cbNode, result);
result = reduceNode((<BindingElement>node).name, cbNode, result);
result = reduceNode((<BindingElement>node).initializer, cbNode, result);
break;
// Expression
case SyntaxKind.ArrayLiteralExpression:
result = reduceNodes((<ArrayLiteralExpression>node).elements, cbNodes, result);
break;
case SyntaxKind.ObjectLiteralExpression:
result = reduceNodes((<ObjectLiteralExpression>node).properties, cbNodes, result);
break;
case SyntaxKind.PropertyAccessExpression:
result = reduceNode((<PropertyAccessExpression>node).expression, cbNode, result);
result = reduceNode((<PropertyAccessExpression>node).name, cbNode, result);
break;
case SyntaxKind.ElementAccessExpression:
result = reduceNode((<ElementAccessExpression>node).expression, cbNode, result);
result = reduceNode((<ElementAccessExpression>node).argumentExpression, cbNode, result);
break;
case SyntaxKind.CallExpression:
result = reduceNode((<CallExpression>node).expression, cbNode, result);
result = reduceNodes((<CallExpression>node).typeArguments, cbNodes, result);
result = reduceNodes((<CallExpression>node).arguments, cbNodes, result);
break;
case SyntaxKind.NewExpression:
result = reduceNode((<NewExpression>node).expression, cbNode, result);
result = reduceNodes((<NewExpression>node).typeArguments, cbNodes, result);
result = reduceNodes((<NewExpression>node).arguments, cbNodes, result);
break;
case SyntaxKind.TaggedTemplateExpression:
result = reduceNode((<TaggedTemplateExpression>node).tag, cbNode, result);
result = reduceNode((<TaggedTemplateExpression>node).template, cbNode, result);
break;
case SyntaxKind.TypeAssertionExpression:
result = reduceNode((<TypeAssertion>node).type, cbNode, result);
result = reduceNode((<TypeAssertion>node).expression, cbNode, result);
break;
case SyntaxKind.FunctionExpression:
result = reduceNodes((<FunctionExpression>node).modifiers, cbNodes, result);
result = reduceNode((<FunctionExpression>node).name, cbNode, result);
result = reduceNodes((<FunctionExpression>node).typeParameters, cbNodes, result);
result = reduceNodes((<FunctionExpression>node).parameters, cbNodes, result);
result = reduceNode((<FunctionExpression>node).type, cbNode, result);
result = reduceNode((<FunctionExpression>node).body, cbNode, result);
break;
case SyntaxKind.ArrowFunction:
result = reduceNodes((<ArrowFunction>node).modifiers, cbNodes, result);
result = reduceNodes((<ArrowFunction>node).typeParameters, cbNodes, result);
result = reduceNodes((<ArrowFunction>node).parameters, cbNodes, result);
result = reduceNode((<ArrowFunction>node).type, cbNode, result);
result = reduceNode((<ArrowFunction>node).body, cbNode, result);
break;
case SyntaxKind.ParenthesizedExpression:
case SyntaxKind.DeleteExpression:
case SyntaxKind.TypeOfExpression:
case SyntaxKind.VoidExpression:
case SyntaxKind.AwaitExpression:
case SyntaxKind.YieldExpression:
case SyntaxKind.SpreadElement:
case SyntaxKind.NonNullExpression:
result = reduceNode((<ParenthesizedExpression | DeleteExpression | TypeOfExpression | VoidExpression | AwaitExpression | YieldExpression | SpreadElement | NonNullExpression>node).expression, cbNode, result);
break;
case SyntaxKind.PrefixUnaryExpression:
case SyntaxKind.PostfixUnaryExpression:
result = reduceNode((<PrefixUnaryExpression | PostfixUnaryExpression>node).operand, cbNode, result);
break;
case SyntaxKind.BinaryExpression:
result = reduceNode((<BinaryExpression>node).left, cbNode, result);
result = reduceNode((<BinaryExpression>node).right, cbNode, result);
break;
case SyntaxKind.ConditionalExpression:
result = reduceNode((<ConditionalExpression>node).condition, cbNode, result);
result = reduceNode((<ConditionalExpression>node).whenTrue, cbNode, result);
result = reduceNode((<ConditionalExpression>node).whenFalse, cbNode, result);
break;
case SyntaxKind.TemplateExpression:
result = reduceNode((<TemplateExpression>node).head, cbNode, result);
result = reduceNodes((<TemplateExpression>node).templateSpans, cbNodes, result);
break;
case SyntaxKind.ClassExpression:
result = reduceNodes((<ClassExpression>node).modifiers, cbNodes, result);
result = reduceNode((<ClassExpression>node).name, cbNode, result);
result = reduceNodes((<ClassExpression>node).typeParameters, cbNodes, result);
result = reduceNodes((<ClassExpression>node).heritageClauses, cbNodes, result);
result = reduceNodes((<ClassExpression>node).members, cbNodes, result);
break;
case SyntaxKind.ExpressionWithTypeArguments:
result = reduceNode((<ExpressionWithTypeArguments>node).expression, cbNode, result);
result = reduceNodes((<ExpressionWithTypeArguments>node).typeArguments, cbNodes, result);
break;
case SyntaxKind.AsExpression:
result = reduceNode((<AsExpression>node).expression, cbNode, result);
result = reduceNode((<AsExpression>node).type, cbNode, result);
break;
case SyntaxKind.NonNullExpression:
result = reduceNode((<NonNullExpression>node).expression, cbNode, result);
break;
// Misc
case SyntaxKind.TemplateSpan:
result = reduceNode((<TemplateSpan>node).expression, cbNode, result);
result = reduceNode((<TemplateSpan>node).literal, cbNode, result);
break;