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utilities.ts
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3431 lines (3003 loc) · 160 KB
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/* @internal */ // Don't expose that we use this
// Based on lib.es6.d.ts
interface PromiseConstructor {
new <T>(executor: (resolve: (value?: T | PromiseLike<T>) => void, reject: (reason?: any) => void) => void): Promise<T>;
reject(reason: any): Promise<never>;
all<T>(values: (T | PromiseLike<T>)[]): Promise<T[]>;
}
/* @internal */
declare var Promise: PromiseConstructor; // eslint-disable-line no-var
/* @internal */
namespace ts {
// These utilities are common to multiple language service features.
//#region
export const scanner: Scanner = createScanner(ScriptTarget.Latest, /*skipTrivia*/ true);
export const enum SemanticMeaning {
None = 0x0,
Value = 0x1,
Type = 0x2,
Namespace = 0x4,
All = Value | Type | Namespace
}
export function getMeaningFromDeclaration(node: Node): SemanticMeaning {
switch (node.kind) {
case SyntaxKind.VariableDeclaration:
return isInJSFile(node) && getJSDocEnumTag(node) ? SemanticMeaning.All : SemanticMeaning.Value;
case SyntaxKind.Parameter:
case SyntaxKind.BindingElement:
case SyntaxKind.PropertyDeclaration:
case SyntaxKind.PropertySignature:
case SyntaxKind.PropertyAssignment:
case SyntaxKind.ShorthandPropertyAssignment:
case SyntaxKind.MethodDeclaration:
case SyntaxKind.MethodSignature:
case SyntaxKind.Constructor:
case SyntaxKind.GetAccessor:
case SyntaxKind.SetAccessor:
case SyntaxKind.FunctionDeclaration:
case SyntaxKind.FunctionExpression:
case SyntaxKind.ArrowFunction:
case SyntaxKind.CatchClause:
case SyntaxKind.JsxAttribute:
return SemanticMeaning.Value;
case SyntaxKind.TypeParameter:
case SyntaxKind.InterfaceDeclaration:
case SyntaxKind.TypeAliasDeclaration:
case SyntaxKind.TypeLiteral:
return SemanticMeaning.Type;
case SyntaxKind.JSDocTypedefTag:
// If it has no name node, it shares the name with the value declaration below it.
return (node as JSDocTypedefTag).name === undefined ? SemanticMeaning.Value | SemanticMeaning.Type : SemanticMeaning.Type;
case SyntaxKind.EnumMember:
case SyntaxKind.ClassDeclaration:
return SemanticMeaning.Value | SemanticMeaning.Type;
case SyntaxKind.ModuleDeclaration:
if (isAmbientModule(node as ModuleDeclaration)) {
return SemanticMeaning.Namespace | SemanticMeaning.Value;
}
else if (getModuleInstanceState(node as ModuleDeclaration) === ModuleInstanceState.Instantiated) {
return SemanticMeaning.Namespace | SemanticMeaning.Value;
}
else {
return SemanticMeaning.Namespace;
}
case SyntaxKind.EnumDeclaration:
case SyntaxKind.NamedImports:
case SyntaxKind.ImportSpecifier:
case SyntaxKind.ImportEqualsDeclaration:
case SyntaxKind.ImportDeclaration:
case SyntaxKind.ExportAssignment:
case SyntaxKind.ExportDeclaration:
return SemanticMeaning.All;
// An external module can be a Value
case SyntaxKind.SourceFile:
return SemanticMeaning.Namespace | SemanticMeaning.Value;
}
return SemanticMeaning.All;
}
export function getMeaningFromLocation(node: Node): SemanticMeaning {
node = getAdjustedReferenceLocation(node);
const parent = node.parent;
if (node.kind === SyntaxKind.SourceFile) {
return SemanticMeaning.Value;
}
else if (isExportAssignment(parent)
|| isExportSpecifier(parent)
|| isExternalModuleReference(parent)
|| isImportSpecifier(parent)
|| isImportClause(parent)
|| isImportEqualsDeclaration(parent) && node === parent.name) {
return SemanticMeaning.All;
}
else if (isInRightSideOfInternalImportEqualsDeclaration(node)) {
return getMeaningFromRightHandSideOfImportEquals(node as Identifier);
}
else if (isDeclarationName(node)) {
return getMeaningFromDeclaration(parent);
}
else if (isEntityName(node) && findAncestor(node, or(isJSDocNameReference, isJSDocLinkLike, isJSDocMemberName))) {
return SemanticMeaning.All;
}
else if (isTypeReference(node)) {
return SemanticMeaning.Type;
}
else if (isNamespaceReference(node)) {
return SemanticMeaning.Namespace;
}
else if (isTypeParameterDeclaration(parent)) {
Debug.assert(isJSDocTemplateTag(parent.parent)); // Else would be handled by isDeclarationName
return SemanticMeaning.Type;
}
else if (isLiteralTypeNode(parent)) {
// This might be T["name"], which is actually referencing a property and not a type. So allow both meanings.
return SemanticMeaning.Type | SemanticMeaning.Value;
}
else {
return SemanticMeaning.Value;
}
}
function getMeaningFromRightHandSideOfImportEquals(node: Node): SemanticMeaning {
// import a = |b|; // Namespace
// import a = |b.c|; // Value, type, namespace
// import a = |b.c|.d; // Namespace
const name = node.kind === SyntaxKind.QualifiedName ? node : isQualifiedName(node.parent) && node.parent.right === node ? node.parent : undefined;
return name && name.parent.kind === SyntaxKind.ImportEqualsDeclaration ? SemanticMeaning.All : SemanticMeaning.Namespace;
}
export function isInRightSideOfInternalImportEqualsDeclaration(node: Node) {
while (node.parent.kind === SyntaxKind.QualifiedName) {
node = node.parent;
}
return isInternalModuleImportEqualsDeclaration(node.parent) && node.parent.moduleReference === node;
}
function isNamespaceReference(node: Node): boolean {
return isQualifiedNameNamespaceReference(node) || isPropertyAccessNamespaceReference(node);
}
function isQualifiedNameNamespaceReference(node: Node): boolean {
let root = node;
let isLastClause = true;
if (root.parent.kind === SyntaxKind.QualifiedName) {
while (root.parent && root.parent.kind === SyntaxKind.QualifiedName) {
root = root.parent;
}
isLastClause = (root as QualifiedName).right === node;
}
return root.parent.kind === SyntaxKind.TypeReference && !isLastClause;
}
function isPropertyAccessNamespaceReference(node: Node): boolean {
let root = node;
let isLastClause = true;
if (root.parent.kind === SyntaxKind.PropertyAccessExpression) {
while (root.parent && root.parent.kind === SyntaxKind.PropertyAccessExpression) {
root = root.parent;
}
isLastClause = (root as PropertyAccessExpression).name === node;
}
if (!isLastClause && root.parent.kind === SyntaxKind.ExpressionWithTypeArguments && root.parent.parent.kind === SyntaxKind.HeritageClause) {
const decl = root.parent.parent.parent;
return (decl.kind === SyntaxKind.ClassDeclaration && (root.parent.parent as HeritageClause).token === SyntaxKind.ImplementsKeyword) ||
(decl.kind === SyntaxKind.InterfaceDeclaration && (root.parent.parent as HeritageClause).token === SyntaxKind.ExtendsKeyword);
}
return false;
}
function isTypeReference(node: Node): boolean {
if (isRightSideOfQualifiedNameOrPropertyAccess(node)) {
node = node.parent;
}
switch (node.kind) {
case SyntaxKind.ThisKeyword:
return !isExpressionNode(node);
case SyntaxKind.ThisType:
return true;
}
switch (node.parent.kind) {
case SyntaxKind.TypeReference:
return true;
case SyntaxKind.ImportType:
return !(node.parent as ImportTypeNode).isTypeOf;
case SyntaxKind.ExpressionWithTypeArguments:
return isPartOfTypeNode(node.parent);
}
return false;
}
export function isCallExpressionTarget(node: Node, includeElementAccess = false, skipPastOuterExpressions = false): boolean {
return isCalleeWorker(node, isCallExpression, selectExpressionOfCallOrNewExpressionOrDecorator, includeElementAccess, skipPastOuterExpressions);
}
export function isNewExpressionTarget(node: Node, includeElementAccess = false, skipPastOuterExpressions = false): boolean {
return isCalleeWorker(node, isNewExpression, selectExpressionOfCallOrNewExpressionOrDecorator, includeElementAccess, skipPastOuterExpressions);
}
export function isCallOrNewExpressionTarget(node: Node, includeElementAccess = false, skipPastOuterExpressions = false): boolean {
return isCalleeWorker(node, isCallOrNewExpression, selectExpressionOfCallOrNewExpressionOrDecorator, includeElementAccess, skipPastOuterExpressions);
}
export function isTaggedTemplateTag(node: Node, includeElementAccess = false, skipPastOuterExpressions = false): boolean {
return isCalleeWorker(node, isTaggedTemplateExpression, selectTagOfTaggedTemplateExpression, includeElementAccess, skipPastOuterExpressions);
}
export function isDecoratorTarget(node: Node, includeElementAccess = false, skipPastOuterExpressions = false): boolean {
return isCalleeWorker(node, isDecorator, selectExpressionOfCallOrNewExpressionOrDecorator, includeElementAccess, skipPastOuterExpressions);
}
export function isJsxOpeningLikeElementTagName(node: Node, includeElementAccess = false, skipPastOuterExpressions = false): boolean {
return isCalleeWorker(node, isJsxOpeningLikeElement, selectTagNameOfJsxOpeningLikeElement, includeElementAccess, skipPastOuterExpressions);
}
function selectExpressionOfCallOrNewExpressionOrDecorator(node: CallExpression | NewExpression | Decorator) {
return node.expression;
}
function selectTagOfTaggedTemplateExpression(node: TaggedTemplateExpression) {
return node.tag;
}
function selectTagNameOfJsxOpeningLikeElement(node: JsxOpeningLikeElement) {
return node.tagName;
}
function isCalleeWorker<T extends CallExpression | NewExpression | TaggedTemplateExpression | Decorator | JsxOpeningLikeElement>(node: Node, pred: (node: Node) => node is T, calleeSelector: (node: T) => Expression, includeElementAccess: boolean, skipPastOuterExpressions: boolean) {
let target = includeElementAccess ? climbPastPropertyOrElementAccess(node) : climbPastPropertyAccess(node);
if (skipPastOuterExpressions) {
target = skipOuterExpressions(target);
}
return !!target && !!target.parent && pred(target.parent) && calleeSelector(target.parent) === target;
}
export function climbPastPropertyAccess(node: Node) {
return isRightSideOfPropertyAccess(node) ? node.parent : node;
}
export function climbPastPropertyOrElementAccess(node: Node) {
return isRightSideOfPropertyAccess(node) || isArgumentExpressionOfElementAccess(node) ? node.parent : node;
}
export function getTargetLabel(referenceNode: Node, labelName: string): Identifier | undefined {
while (referenceNode) {
if (referenceNode.kind === SyntaxKind.LabeledStatement && (referenceNode as LabeledStatement).label.escapedText === labelName) {
return (referenceNode as LabeledStatement).label;
}
referenceNode = referenceNode.parent;
}
return undefined;
}
export function hasPropertyAccessExpressionWithName(node: CallExpression, funcName: string): boolean {
if (!isPropertyAccessExpression(node.expression)) {
return false;
}
return node.expression.name.text === funcName;
}
export function isJumpStatementTarget(node: Node): node is Identifier & { parent: BreakOrContinueStatement } {
return isIdentifier(node) && tryCast(node.parent, isBreakOrContinueStatement)?.label === node;
}
export function isLabelOfLabeledStatement(node: Node): node is Identifier {
return isIdentifier(node) && tryCast(node.parent, isLabeledStatement)?.label === node;
}
export function isLabelName(node: Node): boolean {
return isLabelOfLabeledStatement(node) || isJumpStatementTarget(node);
}
export function isTagName(node: Node): boolean {
return tryCast(node.parent, isJSDocTag)?.tagName === node;
}
export function isRightSideOfQualifiedName(node: Node) {
return tryCast(node.parent, isQualifiedName)?.right === node;
}
export function isRightSideOfPropertyAccess(node: Node) {
return tryCast(node.parent, isPropertyAccessExpression)?.name === node;
}
export function isArgumentExpressionOfElementAccess(node: Node) {
return tryCast(node.parent, isElementAccessExpression)?.argumentExpression === node;
}
export function isNameOfModuleDeclaration(node: Node) {
return tryCast(node.parent, isModuleDeclaration)?.name === node;
}
export function isNameOfFunctionDeclaration(node: Node): boolean {
return isIdentifier(node) && tryCast(node.parent, isFunctionLike)?.name === node;
}
export function isLiteralNameOfPropertyDeclarationOrIndexAccess(node: StringLiteral | NumericLiteral | NoSubstitutionTemplateLiteral): boolean {
switch (node.parent.kind) {
case SyntaxKind.PropertyDeclaration:
case SyntaxKind.PropertySignature:
case SyntaxKind.PropertyAssignment:
case SyntaxKind.EnumMember:
case SyntaxKind.MethodDeclaration:
case SyntaxKind.MethodSignature:
case SyntaxKind.GetAccessor:
case SyntaxKind.SetAccessor:
case SyntaxKind.ModuleDeclaration:
return getNameOfDeclaration(node.parent as Declaration) === node;
case SyntaxKind.ElementAccessExpression:
return (node.parent as ElementAccessExpression).argumentExpression === node;
case SyntaxKind.ComputedPropertyName:
return true;
case SyntaxKind.LiteralType:
return node.parent.parent.kind === SyntaxKind.IndexedAccessType;
default:
return false;
}
}
export function isExpressionOfExternalModuleImportEqualsDeclaration(node: Node) {
return isExternalModuleImportEqualsDeclaration(node.parent.parent) &&
getExternalModuleImportEqualsDeclarationExpression(node.parent.parent) === node;
}
export function getContainerNode(node: Node): Declaration | undefined {
if (isJSDocTypeAlias(node)) {
// This doesn't just apply to the node immediately under the comment, but to everything in its parent's scope.
// node.parent = the JSDoc comment, node.parent.parent = the node having the comment.
// Then we get parent again in the loop.
node = node.parent.parent;
}
while (true) {
node = node.parent;
if (!node) {
return undefined;
}
switch (node.kind) {
case SyntaxKind.SourceFile:
case SyntaxKind.MethodDeclaration:
case SyntaxKind.MethodSignature:
case SyntaxKind.FunctionDeclaration:
case SyntaxKind.FunctionExpression:
case SyntaxKind.GetAccessor:
case SyntaxKind.SetAccessor:
case SyntaxKind.ClassDeclaration:
case SyntaxKind.InterfaceDeclaration:
case SyntaxKind.EnumDeclaration:
case SyntaxKind.ModuleDeclaration:
return node as Declaration;
}
}
}
export function getNodeKind(node: Node): ScriptElementKind {
switch (node.kind) {
case SyntaxKind.SourceFile:
return isExternalModule(node as SourceFile) ? ScriptElementKind.moduleElement : ScriptElementKind.scriptElement;
case SyntaxKind.ModuleDeclaration:
return ScriptElementKind.moduleElement;
case SyntaxKind.ClassDeclaration:
case SyntaxKind.ClassExpression:
return ScriptElementKind.classElement;
case SyntaxKind.InterfaceDeclaration: return ScriptElementKind.interfaceElement;
case SyntaxKind.TypeAliasDeclaration:
case SyntaxKind.JSDocCallbackTag:
case SyntaxKind.JSDocTypedefTag:
return ScriptElementKind.typeElement;
case SyntaxKind.EnumDeclaration: return ScriptElementKind.enumElement;
case SyntaxKind.VariableDeclaration:
return getKindOfVariableDeclaration(node as VariableDeclaration);
case SyntaxKind.BindingElement:
return getKindOfVariableDeclaration(getRootDeclaration(node) as VariableDeclaration);
case SyntaxKind.ArrowFunction:
case SyntaxKind.FunctionDeclaration:
case SyntaxKind.FunctionExpression:
return ScriptElementKind.functionElement;
case SyntaxKind.GetAccessor: return ScriptElementKind.memberGetAccessorElement;
case SyntaxKind.SetAccessor: return ScriptElementKind.memberSetAccessorElement;
case SyntaxKind.MethodDeclaration:
case SyntaxKind.MethodSignature:
return ScriptElementKind.memberFunctionElement;
case SyntaxKind.PropertyAssignment:
const { initializer } = node as PropertyAssignment;
return isFunctionLike(initializer) ? ScriptElementKind.memberFunctionElement : ScriptElementKind.memberVariableElement;
case SyntaxKind.PropertyDeclaration:
case SyntaxKind.PropertySignature:
case SyntaxKind.ShorthandPropertyAssignment:
case SyntaxKind.SpreadAssignment:
return ScriptElementKind.memberVariableElement;
case SyntaxKind.IndexSignature: return ScriptElementKind.indexSignatureElement;
case SyntaxKind.ConstructSignature: return ScriptElementKind.constructSignatureElement;
case SyntaxKind.CallSignature: return ScriptElementKind.callSignatureElement;
case SyntaxKind.Constructor:
case SyntaxKind.ClassStaticBlockDeclaration:
return ScriptElementKind.constructorImplementationElement;
case SyntaxKind.TypeParameter: return ScriptElementKind.typeParameterElement;
case SyntaxKind.EnumMember: return ScriptElementKind.enumMemberElement;
case SyntaxKind.Parameter: return hasSyntacticModifier(node, ModifierFlags.ParameterPropertyModifier) ? ScriptElementKind.memberVariableElement : ScriptElementKind.parameterElement;
case SyntaxKind.ImportEqualsDeclaration:
case SyntaxKind.ImportSpecifier:
case SyntaxKind.ExportSpecifier:
case SyntaxKind.NamespaceImport:
case SyntaxKind.NamespaceExport:
return ScriptElementKind.alias;
case SyntaxKind.BinaryExpression:
const kind = getAssignmentDeclarationKind(node as BinaryExpression);
const { right } = node as BinaryExpression;
switch (kind) {
case AssignmentDeclarationKind.ObjectDefinePropertyValue:
case AssignmentDeclarationKind.ObjectDefinePropertyExports:
case AssignmentDeclarationKind.ObjectDefinePrototypeProperty:
case AssignmentDeclarationKind.None:
return ScriptElementKind.unknown;
case AssignmentDeclarationKind.ExportsProperty:
case AssignmentDeclarationKind.ModuleExports:
const rightKind = getNodeKind(right);
return rightKind === ScriptElementKind.unknown ? ScriptElementKind.constElement : rightKind;
case AssignmentDeclarationKind.PrototypeProperty:
return isFunctionExpression(right) ? ScriptElementKind.memberFunctionElement : ScriptElementKind.memberVariableElement;
case AssignmentDeclarationKind.ThisProperty:
return ScriptElementKind.memberVariableElement; // property
case AssignmentDeclarationKind.Property:
// static method / property
return isFunctionExpression(right) ? ScriptElementKind.memberFunctionElement : ScriptElementKind.memberVariableElement;
case AssignmentDeclarationKind.Prototype:
return ScriptElementKind.localClassElement;
default: {
assertType<never>(kind);
return ScriptElementKind.unknown;
}
}
case SyntaxKind.Identifier:
return isImportClause(node.parent) ? ScriptElementKind.alias : ScriptElementKind.unknown;
case SyntaxKind.ExportAssignment:
const scriptKind = getNodeKind((node as ExportAssignment).expression);
// If the expression didn't come back with something (like it does for an identifiers)
return scriptKind === ScriptElementKind.unknown ? ScriptElementKind.constElement : scriptKind;
default:
return ScriptElementKind.unknown;
}
function getKindOfVariableDeclaration(v: VariableDeclaration): ScriptElementKind {
return isVarConst(v)
? ScriptElementKind.constElement
: isLet(v)
? ScriptElementKind.letElement
: ScriptElementKind.variableElement;
}
}
export function isThis(node: Node): boolean {
switch (node.kind) {
case SyntaxKind.ThisKeyword:
// case SyntaxKind.ThisType: TODO: GH#9267
return true;
case SyntaxKind.Identifier:
// 'this' as a parameter
return identifierIsThisKeyword(node as Identifier) && node.parent.kind === SyntaxKind.Parameter;
default:
return false;
}
}
// Matches the beginning of a triple slash directive
const tripleSlashDirectivePrefixRegex = /^\/\/\/\s*</;
export interface ListItemInfo {
listItemIndex: number;
list: Node;
}
export function getLineStartPositionForPosition(position: number, sourceFile: SourceFileLike): number {
const lineStarts = getLineStarts(sourceFile);
const line = sourceFile.getLineAndCharacterOfPosition(position).line;
return lineStarts[line];
}
export function rangeContainsRange(r1: TextRange, r2: TextRange): boolean {
return startEndContainsRange(r1.pos, r1.end, r2);
}
export function rangeContainsRangeExclusive(r1: TextRange, r2: TextRange): boolean {
return rangeContainsPositionExclusive(r1, r2.pos) && rangeContainsPositionExclusive(r1, r2.end);
}
export function rangeContainsPosition(r: TextRange, pos: number): boolean {
return r.pos <= pos && pos <= r.end;
}
export function rangeContainsPositionExclusive(r: TextRange, pos: number) {
return r.pos < pos && pos < r.end;
}
export function startEndContainsRange(start: number, end: number, range: TextRange): boolean {
return start <= range.pos && end >= range.end;
}
export function rangeContainsStartEnd(range: TextRange, start: number, end: number): boolean {
return range.pos <= start && range.end >= end;
}
export function rangeOverlapsWithStartEnd(r1: TextRange, start: number, end: number) {
return startEndOverlapsWithStartEnd(r1.pos, r1.end, start, end);
}
export function nodeOverlapsWithStartEnd(node: Node, sourceFile: SourceFile, start: number, end: number) {
return startEndOverlapsWithStartEnd(node.getStart(sourceFile), node.end, start, end);
}
export function startEndOverlapsWithStartEnd(start1: number, end1: number, start2: number, end2: number) {
const start = Math.max(start1, start2);
const end = Math.min(end1, end2);
return start < end;
}
/**
* Assumes `candidate.start <= position` holds.
*/
export function positionBelongsToNode(candidate: Node, position: number, sourceFile: SourceFile): boolean {
Debug.assert(candidate.pos <= position);
return position < candidate.end || !isCompletedNode(candidate, sourceFile);
}
function isCompletedNode(n: Node | undefined, sourceFile: SourceFile): boolean {
if (n === undefined || nodeIsMissing(n)) {
return false;
}
switch (n.kind) {
case SyntaxKind.ClassDeclaration:
case SyntaxKind.InterfaceDeclaration:
case SyntaxKind.EnumDeclaration:
case SyntaxKind.ObjectLiteralExpression:
case SyntaxKind.ObjectBindingPattern:
case SyntaxKind.TypeLiteral:
case SyntaxKind.Block:
case SyntaxKind.ModuleBlock:
case SyntaxKind.CaseBlock:
case SyntaxKind.NamedImports:
case SyntaxKind.NamedExports:
return nodeEndsWith(n, SyntaxKind.CloseBraceToken, sourceFile);
case SyntaxKind.CatchClause:
return isCompletedNode((n as CatchClause).block, sourceFile);
case SyntaxKind.NewExpression:
if (!(n as NewExpression).arguments) {
return true;
}
// falls through
case SyntaxKind.CallExpression:
case SyntaxKind.ParenthesizedExpression:
case SyntaxKind.ParenthesizedType:
return nodeEndsWith(n, SyntaxKind.CloseParenToken, sourceFile);
case SyntaxKind.FunctionType:
case SyntaxKind.ConstructorType:
return isCompletedNode((n as SignatureDeclaration).type, sourceFile);
case SyntaxKind.Constructor:
case SyntaxKind.GetAccessor:
case SyntaxKind.SetAccessor:
case SyntaxKind.FunctionDeclaration:
case SyntaxKind.FunctionExpression:
case SyntaxKind.MethodDeclaration:
case SyntaxKind.MethodSignature:
case SyntaxKind.ConstructSignature:
case SyntaxKind.CallSignature:
case SyntaxKind.ArrowFunction:
if ((n as FunctionLikeDeclaration).body) {
return isCompletedNode((n as FunctionLikeDeclaration).body, sourceFile);
}
if ((n as FunctionLikeDeclaration).type) {
return isCompletedNode((n as FunctionLikeDeclaration).type, sourceFile);
}
// Even though type parameters can be unclosed, we can get away with
// having at least a closing paren.
return hasChildOfKind(n, SyntaxKind.CloseParenToken, sourceFile);
case SyntaxKind.ModuleDeclaration:
return !!(n as ModuleDeclaration).body && isCompletedNode((n as ModuleDeclaration).body, sourceFile);
case SyntaxKind.IfStatement:
if ((n as IfStatement).elseStatement) {
return isCompletedNode((n as IfStatement).elseStatement, sourceFile);
}
return isCompletedNode((n as IfStatement).thenStatement, sourceFile);
case SyntaxKind.ExpressionStatement:
return isCompletedNode((n as ExpressionStatement).expression, sourceFile) ||
hasChildOfKind(n, SyntaxKind.SemicolonToken, sourceFile);
case SyntaxKind.ArrayLiteralExpression:
case SyntaxKind.ArrayBindingPattern:
case SyntaxKind.ElementAccessExpression:
case SyntaxKind.ComputedPropertyName:
case SyntaxKind.TupleType:
return nodeEndsWith(n, SyntaxKind.CloseBracketToken, sourceFile);
case SyntaxKind.IndexSignature:
if ((n as IndexSignatureDeclaration).type) {
return isCompletedNode((n as IndexSignatureDeclaration).type, sourceFile);
}
return hasChildOfKind(n, SyntaxKind.CloseBracketToken, sourceFile);
case SyntaxKind.CaseClause:
case SyntaxKind.DefaultClause:
// there is no such thing as terminator token for CaseClause/DefaultClause so for simplicity always consider them non-completed
return false;
case SyntaxKind.ForStatement:
case SyntaxKind.ForInStatement:
case SyntaxKind.ForOfStatement:
case SyntaxKind.WhileStatement:
return isCompletedNode((n as IterationStatement).statement, sourceFile);
case SyntaxKind.DoStatement:
// rough approximation: if DoStatement has While keyword - then if node is completed is checking the presence of ')';
return hasChildOfKind(n, SyntaxKind.WhileKeyword, sourceFile)
? nodeEndsWith(n, SyntaxKind.CloseParenToken, sourceFile)
: isCompletedNode((n as DoStatement).statement, sourceFile);
case SyntaxKind.TypeQuery:
return isCompletedNode((n as TypeQueryNode).exprName, sourceFile);
case SyntaxKind.TypeOfExpression:
case SyntaxKind.DeleteExpression:
case SyntaxKind.VoidExpression:
case SyntaxKind.YieldExpression:
case SyntaxKind.SpreadElement:
const unaryWordExpression = n as (TypeOfExpression | DeleteExpression | VoidExpression | YieldExpression | SpreadElement);
return isCompletedNode(unaryWordExpression.expression, sourceFile);
case SyntaxKind.TaggedTemplateExpression:
return isCompletedNode((n as TaggedTemplateExpression).template, sourceFile);
case SyntaxKind.TemplateExpression:
const lastSpan = lastOrUndefined((n as TemplateExpression).templateSpans);
return isCompletedNode(lastSpan, sourceFile);
case SyntaxKind.TemplateSpan:
return nodeIsPresent((n as TemplateSpan).literal);
case SyntaxKind.ExportDeclaration:
case SyntaxKind.ImportDeclaration:
return nodeIsPresent((n as ExportDeclaration | ImportDeclaration).moduleSpecifier);
case SyntaxKind.PrefixUnaryExpression:
return isCompletedNode((n as PrefixUnaryExpression).operand, sourceFile);
case SyntaxKind.BinaryExpression:
return isCompletedNode((n as BinaryExpression).right, sourceFile);
case SyntaxKind.ConditionalExpression:
return isCompletedNode((n as ConditionalExpression).whenFalse, sourceFile);
default:
return true;
}
}
/*
* Checks if node ends with 'expectedLastToken'.
* If child at position 'length - 1' is 'SemicolonToken' it is skipped and 'expectedLastToken' is compared with child at position 'length - 2'.
*/
function nodeEndsWith(n: Node, expectedLastToken: SyntaxKind, sourceFile: SourceFile): boolean {
const children = n.getChildren(sourceFile);
if (children.length) {
const lastChild = last(children);
if (lastChild.kind === expectedLastToken) {
return true;
}
else if (lastChild.kind === SyntaxKind.SemicolonToken && children.length !== 1) {
return children[children.length - 2].kind === expectedLastToken;
}
}
return false;
}
export function findListItemInfo(node: Node): ListItemInfo | undefined {
const list = findContainingList(node);
// It is possible at this point for syntaxList to be undefined, either if
// node.parent had no list child, or if none of its list children contained
// the span of node. If this happens, return undefined. The caller should
// handle this case.
if (!list) {
return undefined;
}
const children = list.getChildren();
const listItemIndex = indexOfNode(children, node);
return {
listItemIndex,
list
};
}
export function hasChildOfKind(n: Node, kind: SyntaxKind, sourceFile: SourceFile): boolean {
return !!findChildOfKind(n, kind, sourceFile);
}
export function findChildOfKind<T extends Node>(n: Node, kind: T["kind"], sourceFile: SourceFileLike): T | undefined {
return find(n.getChildren(sourceFile), (c): c is T => c.kind === kind);
}
export function findContainingList(node: Node): SyntaxList | undefined {
// The node might be a list element (nonsynthetic) or a comma (synthetic). Either way, it will
// be parented by the container of the SyntaxList, not the SyntaxList itself.
// In order to find the list item index, we first need to locate SyntaxList itself and then search
// for the position of the relevant node (or comma).
const syntaxList = find(node.parent.getChildren(), (c): c is SyntaxList => isSyntaxList(c) && rangeContainsRange(c, node));
// Either we didn't find an appropriate list, or the list must contain us.
Debug.assert(!syntaxList || contains(syntaxList.getChildren(), node));
return syntaxList;
}
function isDefaultModifier(node: Node) {
return node.kind === SyntaxKind.DefaultKeyword;
}
function isClassKeyword(node: Node) {
return node.kind === SyntaxKind.ClassKeyword;
}
function isFunctionKeyword(node: Node) {
return node.kind === SyntaxKind.FunctionKeyword;
}
function getAdjustedLocationForClass(node: ClassDeclaration | ClassExpression) {
if (isNamedDeclaration(node)) {
return node.name;
}
if (isClassDeclaration(node)) {
// for class and function declarations, use the `default` modifier
// when the declaration is unnamed.
const defaultModifier = node.modifiers && find(node.modifiers, isDefaultModifier);
if (defaultModifier) return defaultModifier;
}
if (isClassExpression(node)) {
// for class expressions, use the `class` keyword when the class is unnamed
const classKeyword = find(node.getChildren(), isClassKeyword);
if (classKeyword) return classKeyword;
}
}
function getAdjustedLocationForFunction(node: FunctionDeclaration | FunctionExpression) {
if (isNamedDeclaration(node)) {
return node.name;
}
if (isFunctionDeclaration(node)) {
// for class and function declarations, use the `default` modifier
// when the declaration is unnamed.
const defaultModifier = find(node.modifiers, isDefaultModifier);
if (defaultModifier) return defaultModifier;
}
if (isFunctionExpression(node)) {
// for function expressions, use the `function` keyword when the function is unnamed
const functionKeyword = find(node.getChildren(), isFunctionKeyword);
if (functionKeyword) return functionKeyword;
}
}
function getAncestorTypeNode(node: Node) {
let lastTypeNode: TypeNode | undefined;
findAncestor(node, a => {
if (isTypeNode(a)) {
lastTypeNode = a;
}
return !isQualifiedName(a.parent) && !isTypeNode(a.parent) && !isTypeElement(a.parent);
});
return lastTypeNode;
}
export function getContextualTypeFromParentOrAncestorTypeNode(node: Expression, checker: TypeChecker): Type | undefined {
if (node.flags & (NodeFlags.JSDoc & ~NodeFlags.JavaScriptFile)) return undefined;
const contextualType = getContextualTypeFromParent(node, checker);
if (contextualType) return contextualType;
const ancestorTypeNode = getAncestorTypeNode(node);
return ancestorTypeNode && checker.getTypeAtLocation(ancestorTypeNode);
}
function getAdjustedLocationForDeclaration(node: Node, forRename: boolean) {
if (!forRename) {
switch (node.kind) {
case SyntaxKind.ClassDeclaration:
case SyntaxKind.ClassExpression:
return getAdjustedLocationForClass(node as ClassDeclaration | ClassExpression);
case SyntaxKind.FunctionDeclaration:
case SyntaxKind.FunctionExpression:
return getAdjustedLocationForFunction(node as FunctionDeclaration | FunctionExpression);
case SyntaxKind.Constructor:
return node;
}
}
if (isNamedDeclaration(node)) {
return node.name;
}
}
function getAdjustedLocationForImportDeclaration(node: ImportDeclaration, forRename: boolean) {
if (node.importClause) {
if (node.importClause.name && node.importClause.namedBindings) {
// do not adjust if we have both a name and named bindings
return;
}
// /**/import [|name|] from ...;
// import /**/type [|name|] from ...;
if (node.importClause.name) {
return node.importClause.name;
}
// /**/import { [|name|] } from ...;
// /**/import { propertyName as [|name|] } from ...;
// /**/import * as [|name|] from ...;
// import /**/type { [|name|] } from ...;
// import /**/type { propertyName as [|name|] } from ...;
// import /**/type * as [|name|] from ...;
if (node.importClause.namedBindings) {
if (isNamedImports(node.importClause.namedBindings)) {
// do nothing if there is more than one binding
const onlyBinding = singleOrUndefined(node.importClause.namedBindings.elements);
if (!onlyBinding) {
return;
}
return onlyBinding.name;
}
else if (isNamespaceImport(node.importClause.namedBindings)) {
return node.importClause.namedBindings.name;
}
}
}
if (!forRename) {
// /**/import "[|module|]";
// /**/import ... from "[|module|]";
// import /**/type ... from "[|module|]";
return node.moduleSpecifier;
}
}
function getAdjustedLocationForExportDeclaration(node: ExportDeclaration, forRename: boolean) {
if (node.exportClause) {
// /**/export { [|name|] } ...
// /**/export { propertyName as [|name|] } ...
// /**/export * as [|name|] ...
// export /**/type { [|name|] } from ...
// export /**/type { propertyName as [|name|] } from ...
// export /**/type * as [|name|] ...
if (isNamedExports(node.exportClause)) {
// do nothing if there is more than one binding
const onlyBinding = singleOrUndefined(node.exportClause.elements);
if (!onlyBinding) {
return;
}
return node.exportClause.elements[0].name;
}
else if (isNamespaceExport(node.exportClause)) {
return node.exportClause.name;
}
}
if (!forRename) {
// /**/export * from "[|module|]";
// export /**/type * from "[|module|]";
return node.moduleSpecifier;
}
}
function getAdjustedLocationForHeritageClause(node: HeritageClause) {
// /**/extends [|name|]
// /**/implements [|name|]
if (node.types.length === 1) {
return node.types[0].expression;
}
// /**/extends name1, name2 ...
// /**/implements name1, name2 ...
}
function getAdjustedLocation(node: Node, forRename: boolean): Node {
const { parent } = node;
// /**/<modifier> [|name|] ...
// /**/<modifier> <class|interface|type|enum|module|namespace|function|get|set> [|name|] ...
// /**/<class|interface|type|enum|module|namespace|function|get|set> [|name|] ...
// /**/import [|name|] = ...
//
// NOTE: If the node is a modifier, we don't adjust its location if it is the `default` modifier as that is handled
// specially by `getSymbolAtLocation`.
if (isModifier(node) && (forRename || node.kind !== SyntaxKind.DefaultKeyword) ? canHaveModifiers(parent) && contains(parent.modifiers, node) :
node.kind === SyntaxKind.ClassKeyword ? isClassDeclaration(parent) || isClassExpression(node) :
node.kind === SyntaxKind.FunctionKeyword ? isFunctionDeclaration(parent) || isFunctionExpression(node) :
node.kind === SyntaxKind.InterfaceKeyword ? isInterfaceDeclaration(parent) :
node.kind === SyntaxKind.EnumKeyword ? isEnumDeclaration(parent) :
node.kind === SyntaxKind.TypeKeyword ? isTypeAliasDeclaration(parent) :
node.kind === SyntaxKind.NamespaceKeyword || node.kind === SyntaxKind.ModuleKeyword ? isModuleDeclaration(parent) :
node.kind === SyntaxKind.ImportKeyword ? isImportEqualsDeclaration(parent) :
node.kind === SyntaxKind.GetKeyword ? isGetAccessorDeclaration(parent) :
node.kind === SyntaxKind.SetKeyword && isSetAccessorDeclaration(parent)) {
const location = getAdjustedLocationForDeclaration(parent, forRename);
if (location) {
return location;
}
}
// /**/<var|let|const> [|name|] ...
if ((node.kind === SyntaxKind.VarKeyword || node.kind === SyntaxKind.ConstKeyword || node.kind === SyntaxKind.LetKeyword) &&
isVariableDeclarationList(parent) && parent.declarations.length === 1) {
const decl = parent.declarations[0];
if (isIdentifier(decl.name)) {
return decl.name;
}
}
if (node.kind === SyntaxKind.TypeKeyword) {
// import /**/type [|name|] from ...;
// import /**/type { [|name|] } from ...;
// import /**/type { propertyName as [|name|] } from ...;
// import /**/type ... from "[|module|]";
if (isImportClause(parent) && parent.isTypeOnly) {
const location = getAdjustedLocationForImportDeclaration(parent.parent, forRename);
if (location) {
return location;
}
}
// export /**/type { [|name|] } from ...;
// export /**/type { propertyName as [|name|] } from ...;
// export /**/type * from "[|module|]";
// export /**/type * as ... from "[|module|]";
if (isExportDeclaration(parent) && parent.isTypeOnly) {
const location = getAdjustedLocationForExportDeclaration(parent, forRename);
if (location) {
return location;
}
}
}
// import { propertyName /**/as [|name|] } ...
// import * /**/as [|name|] ...
// export { propertyName /**/as [|name|] } ...
// export * /**/as [|name|] ...
if (node.kind === SyntaxKind.AsKeyword) {
if (isImportSpecifier(parent) && parent.propertyName ||
isExportSpecifier(parent) && parent.propertyName ||
isNamespaceImport(parent) ||
isNamespaceExport(parent)) {
return parent.name;
}
if (isExportDeclaration(parent) && parent.exportClause && isNamespaceExport(parent.exportClause)) {
return parent.exportClause.name;
}
}
// /**/import [|name|] from ...;
// /**/import { [|name|] } from ...;
// /**/import { propertyName as [|name|] } from ...;
// /**/import ... from "[|module|]";
// /**/import "[|module|]";
if (node.kind === SyntaxKind.ImportKeyword && isImportDeclaration(parent)) {
const location = getAdjustedLocationForImportDeclaration(parent, forRename);
if (location) {
return location;
}
}
if (node.kind === SyntaxKind.ExportKeyword) {
// /**/export { [|name|] } ...;
// /**/export { propertyName as [|name|] } ...;
// /**/export * from "[|module|]";
// /**/export * as ... from "[|module|]";
if (isExportDeclaration(parent)) {
const location = getAdjustedLocationForExportDeclaration(parent, forRename);
if (location) {
return location;
}
}
// NOTE: We don't adjust the location of the `default` keyword as that is handled specially by `getSymbolAtLocation`.
// /**/export default [|name|];
// /**/export = [|name|];
if (isExportAssignment(parent)) {
return skipOuterExpressions(parent.expression);
}
}
// import name = /**/require("[|module|]");
if (node.kind === SyntaxKind.RequireKeyword && isExternalModuleReference(parent)) {
return parent.expression;
}