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/// <reference path="sys.ts" />
/* @internal */
namespace ts {
export interface ReferencePathMatchResult {
fileReference?: FileReference;
diagnosticMessage?: DiagnosticMessage;
isNoDefaultLib?: boolean;
}
export interface SynthesizedNode extends Node {
leadingCommentRanges?: CommentRange[];
trailingCommentRanges?: CommentRange[];
startsOnNewLine: boolean;
}
export function getDeclarationOfKind(symbol: Symbol, kind: SyntaxKind): Declaration {
const declarations = symbol.declarations;
if (declarations) {
for (const declaration of declarations) {
if (declaration.kind === kind) {
return declaration;
}
}
}
return undefined;
}
export interface StringSymbolWriter extends SymbolWriter {
string(): string;
}
export interface EmitHost extends ScriptReferenceHost {
getSourceFiles(): SourceFile[];
getCommonSourceDirectory(): string;
getCanonicalFileName(fileName: string): string;
getNewLine(): string;
isEmitBlocked(emitFileName: string): boolean;
writeFile: WriteFileCallback;
}
// Pool writers to avoid needing to allocate them for every symbol we write.
const stringWriters: StringSymbolWriter[] = [];
export function getSingleLineStringWriter(): StringSymbolWriter {
if (stringWriters.length === 0) {
let str = "";
const writeText: (text: string) => void = text => str += text;
return {
string: () => str,
writeKeyword: writeText,
writeOperator: writeText,
writePunctuation: writeText,
writeSpace: writeText,
writeStringLiteral: writeText,
writeParameter: writeText,
writeSymbol: writeText,
// Completely ignore indentation for string writers. And map newlines to
// a single space.
writeLine: () => str += " ",
increaseIndent: () => { },
decreaseIndent: () => { },
clear: () => str = "",
trackSymbol: () => { },
reportInaccessibleThisError: () => { }
};
}
return stringWriters.pop();
}
export function releaseStringWriter(writer: StringSymbolWriter) {
writer.clear();
stringWriters.push(writer);
}
export function getFullWidth(node: Node) {
return node.end - node.pos;
}
export function arrayIsEqualTo<T>(array1: T[], array2: T[], equaler?: (a: T, b: T) => boolean): boolean {
if (!array1 || !array2) {
return array1 === array2;
}
if (array1.length !== array2.length) {
return false;
}
for (let i = 0; i < array1.length; i++) {
const equals = equaler ? equaler(array1[i], array2[i]) : array1[i] === array2[i];
if (!equals) {
return false;
}
}
return true;
}
export function hasResolvedModule(sourceFile: SourceFile, moduleNameText: string): boolean {
return sourceFile.resolvedModules && hasProperty(sourceFile.resolvedModules, moduleNameText);
}
export function getResolvedModule(sourceFile: SourceFile, moduleNameText: string): ResolvedModule {
return hasResolvedModule(sourceFile, moduleNameText) ? sourceFile.resolvedModules[moduleNameText] : undefined;
}
export function setResolvedModule(sourceFile: SourceFile, moduleNameText: string, resolvedModule: ResolvedModule): void {
if (!sourceFile.resolvedModules) {
sourceFile.resolvedModules = {};
}
sourceFile.resolvedModules[moduleNameText] = resolvedModule;
}
// Returns true if this node contains a parse error anywhere underneath it.
export function containsParseError(node: Node): boolean {
aggregateChildData(node);
return (node.flags & NodeFlags.ThisNodeOrAnySubNodesHasError) !== 0;
}
function aggregateChildData(node: Node): void {
if (!(node.flags & NodeFlags.HasAggregatedChildData)) {
// A node is considered to contain a parse error if:
// a) the parser explicitly marked that it had an error
// b) any of it's children reported that it had an error.
const thisNodeOrAnySubNodesHasError = ((node.flags & NodeFlags.ThisNodeHasError) !== 0) ||
forEachChild(node, containsParseError);
// If so, mark ourselves accordingly.
if (thisNodeOrAnySubNodesHasError) {
node.flags |= NodeFlags.ThisNodeOrAnySubNodesHasError;
}
// Also mark that we've propagated the child information to this node. This way we can
// always consult the bit directly on this node without needing to check its children
// again.
node.flags |= NodeFlags.HasAggregatedChildData;
}
}
export function getSourceFileOfNode(node: Node): SourceFile {
while (node && node.kind !== SyntaxKind.SourceFile) {
node = node.parent;
}
return <SourceFile>node;
}
export function isStatementWithLocals(node: Node) {
switch (node.kind) {
case SyntaxKind.Block:
case SyntaxKind.CaseBlock:
case SyntaxKind.ForStatement:
case SyntaxKind.ForInStatement:
case SyntaxKind.ForOfStatement:
return true;
}
return false;
}
export function getStartPositionOfLine(line: number, sourceFile: SourceFile): number {
Debug.assert(line >= 0);
return getLineStarts(sourceFile)[line];
}
// This is a useful function for debugging purposes.
export function nodePosToString(node: Node): string {
const file = getSourceFileOfNode(node);
const loc = getLineAndCharacterOfPosition(file, node.pos);
return `${ file.fileName }(${ loc.line + 1 },${ loc.character + 1 })`;
}
export function getStartPosOfNode(node: Node): number {
return node.pos;
}
export function getEndLinePosition(line: number, sourceFile: SourceFile): number {
Debug.assert(line >= 0);
const lineStarts = getLineStarts(sourceFile);
const lineIndex = line;
const sourceText = sourceFile.text;
if (lineIndex + 1 === lineStarts.length) {
// last line - return EOF
return sourceText.length - 1;
}
else {
// current line start
const start = lineStarts[lineIndex];
// take the start position of the next line - 1 = it should be some line break
let pos = lineStarts[lineIndex + 1] - 1;
Debug.assert(isLineBreak(sourceText.charCodeAt(pos)));
// walk backwards skipping line breaks, stop the the beginning of current line.
// i.e:
// <some text>
// $ <- end of line for this position should match the start position
while (start <= pos && isLineBreak(sourceText.charCodeAt(pos))) {
pos--;
}
return pos;
}
}
// Returns true if this node is missing from the actual source code. A 'missing' node is different
// from 'undefined/defined'. When a node is undefined (which can happen for optional nodes
// in the tree), it is definitely missing. However, a node may be defined, but still be
// missing. This happens whenever the parser knows it needs to parse something, but can't
// get anything in the source code that it expects at that location. For example:
//
// let a: ;
//
// Here, the Type in the Type-Annotation is not-optional (as there is a colon in the source
// code). So the parser will attempt to parse out a type, and will create an actual node.
// However, this node will be 'missing' in the sense that no actual source-code/tokens are
// contained within it.
export function nodeIsMissing(node: Node) {
if (!node) {
return true;
}
return node.pos === node.end && node.pos >= 0 && node.kind !== SyntaxKind.EndOfFileToken;
}
export function nodeIsPresent(node: Node) {
return !nodeIsMissing(node);
}
export function getTokenPosOfNode(node: Node, sourceFile?: SourceFile): number {
// With nodes that have no width (i.e. 'Missing' nodes), we actually *don't*
// want to skip trivia because this will launch us forward to the next token.
if (nodeIsMissing(node)) {
return node.pos;
}
return skipTrivia((sourceFile || getSourceFileOfNode(node)).text, node.pos);
}
export function getNonDecoratorTokenPosOfNode(node: Node, sourceFile?: SourceFile): number {
if (nodeIsMissing(node) || !node.decorators) {
return getTokenPosOfNode(node, sourceFile);
}
return skipTrivia((sourceFile || getSourceFileOfNode(node)).text, node.decorators.end);
}
export function getSourceTextOfNodeFromSourceFile(sourceFile: SourceFile, node: Node, includeTrivia = false): string {
if (nodeIsMissing(node)) {
return "";
}
const text = sourceFile.text;
return text.substring(includeTrivia ? node.pos : skipTrivia(text, node.pos), node.end);
}
export function getTextOfNodeFromSourceText(sourceText: string, node: Node): string {
if (nodeIsMissing(node)) {
return "";
}
return sourceText.substring(skipTrivia(sourceText, node.pos), node.end);
}
export function getTextOfNode(node: Node, includeTrivia = false): string {
return getSourceTextOfNodeFromSourceFile(getSourceFileOfNode(node), node, includeTrivia);
}
// Add an extra underscore to identifiers that start with two underscores to avoid issues with magic names like '__proto__'
export function escapeIdentifier(identifier: string): string {
return identifier.length >= 2 && identifier.charCodeAt(0) === CharacterCodes._ && identifier.charCodeAt(1) === CharacterCodes._ ? "_" + identifier : identifier;
}
// Remove extra underscore from escaped identifier
export function unescapeIdentifier(identifier: string): string {
return identifier.length >= 3 && identifier.charCodeAt(0) === CharacterCodes._ && identifier.charCodeAt(1) === CharacterCodes._ && identifier.charCodeAt(2) === CharacterCodes._ ? identifier.substr(1) : identifier;
}
// Make an identifier from an external module name by extracting the string after the last "/" and replacing
// all non-alphanumeric characters with underscores
export function makeIdentifierFromModuleName(moduleName: string): string {
return getBaseFileName(moduleName).replace(/^(\d)/, "_$1").replace(/\W/g, "_");
}
export function isBlockOrCatchScoped(declaration: Declaration) {
return (getCombinedNodeFlags(declaration) & NodeFlags.BlockScoped) !== 0 ||
isCatchClauseVariableDeclaration(declaration);
}
export function isAmbientModule(node: Node): boolean {
return node && node.kind === SyntaxKind.ModuleDeclaration &&
((<ModuleDeclaration>node).name.kind === SyntaxKind.StringLiteral || isGlobalScopeAugmentation(<ModuleDeclaration>node));
}
export function isBlockScopedContainerTopLevel(node: Node): boolean {
return node.kind === SyntaxKind.SourceFile ||
node.kind === SyntaxKind.ModuleDeclaration ||
isFunctionLike(node) ||
isFunctionBlock(node);
}
export function isGlobalScopeAugmentation(module: ModuleDeclaration): boolean {
return !!(module.flags & NodeFlags.GlobalAugmentation);
}
export function isExternalModuleAugmentation(node: Node): boolean {
// external module augmentation is a ambient module declaration that is either:
// - defined in the top level scope and source file is an external module
// - defined inside ambient module declaration located in the top level scope and source file not an external module
if (!node || !isAmbientModule(node)) {
return false;
}
switch (node.parent.kind) {
case SyntaxKind.SourceFile:
return isExternalModule(<SourceFile>node.parent);
case SyntaxKind.ModuleBlock:
return isAmbientModule(node.parent.parent) && !isExternalModule(<SourceFile>node.parent.parent.parent);
}
return false;
}
// Gets the nearest enclosing block scope container that has the provided node
// as a descendant, that is not the provided node.
export function getEnclosingBlockScopeContainer(node: Node): Node {
let current = node.parent;
while (current) {
if (isFunctionLike(current)) {
return current;
}
switch (current.kind) {
case SyntaxKind.SourceFile:
case SyntaxKind.CaseBlock:
case SyntaxKind.CatchClause:
case SyntaxKind.ModuleDeclaration:
case SyntaxKind.ForStatement:
case SyntaxKind.ForInStatement:
case SyntaxKind.ForOfStatement:
return current;
case SyntaxKind.Block:
// function block is not considered block-scope container
// see comment in binder.ts: bind(...), case for SyntaxKind.Block
if (!isFunctionLike(current.parent)) {
return current;
}
}
current = current.parent;
}
}
export function isCatchClauseVariableDeclaration(declaration: Declaration) {
return declaration &&
declaration.kind === SyntaxKind.VariableDeclaration &&
declaration.parent &&
declaration.parent.kind === SyntaxKind.CatchClause;
}
// Return display name of an identifier
// Computed property names will just be emitted as "[<expr>]", where <expr> is the source
// text of the expression in the computed property.
export function declarationNameToString(name: DeclarationName) {
return getFullWidth(name) === 0 ? "(Missing)" : getTextOfNode(name);
}
export function createDiagnosticForNode(node: Node, message: DiagnosticMessage, arg0?: any, arg1?: any, arg2?: any): Diagnostic {
const sourceFile = getSourceFileOfNode(node);
const span = getErrorSpanForNode(sourceFile, node);
return createFileDiagnostic(sourceFile, span.start, span.length, message, arg0, arg1, arg2);
}
export function createDiagnosticForNodeFromMessageChain(node: Node, messageChain: DiagnosticMessageChain): Diagnostic {
const sourceFile = getSourceFileOfNode(node);
const span = getErrorSpanForNode(sourceFile, node);
return {
file: sourceFile,
start: span.start,
length: span.length,
code: messageChain.code,
category: messageChain.category,
messageText: messageChain.next ? messageChain : messageChain.messageText
};
}
export function getSpanOfTokenAtPosition(sourceFile: SourceFile, pos: number): TextSpan {
const scanner = createScanner(sourceFile.languageVersion, /*skipTrivia*/ true, sourceFile.languageVariant, sourceFile.text, /*onError:*/ undefined, pos);
scanner.scan();
const start = scanner.getTokenPos();
return createTextSpanFromBounds(start, scanner.getTextPos());
}
function getErrorSpanForArrowFunction(sourceFile: SourceFile, node: ArrowFunction): TextSpan {
const pos = skipTrivia(sourceFile.text, node.pos);
if (node.body && node.body.kind === SyntaxKind.Block) {
const { line: startLine } = getLineAndCharacterOfPosition(sourceFile, node.body.pos);
const { line: endLine } = getLineAndCharacterOfPosition(sourceFile, node.body.end);
if (startLine < endLine) {
// The arrow function spans multiple lines,
// make the error span be the first line, inclusive.
return createTextSpan(pos, getEndLinePosition(startLine, sourceFile) - pos + 1);
}
}
return createTextSpanFromBounds(pos, node.end);
}
export function getErrorSpanForNode(sourceFile: SourceFile, node: Node): TextSpan {
let errorNode = node;
switch (node.kind) {
case SyntaxKind.SourceFile:
let pos = skipTrivia(sourceFile.text, 0, /*stopAfterLineBreak*/ false);
if (pos === sourceFile.text.length) {
// file is empty - return span for the beginning of the file
return createTextSpan(0, 0);
}
return getSpanOfTokenAtPosition(sourceFile, pos);
// This list is a work in progress. Add missing node kinds to improve their error
// spans.
case SyntaxKind.VariableDeclaration:
case SyntaxKind.BindingElement:
case SyntaxKind.ClassDeclaration:
case SyntaxKind.ClassExpression:
case SyntaxKind.InterfaceDeclaration:
case SyntaxKind.ModuleDeclaration:
case SyntaxKind.EnumDeclaration:
case SyntaxKind.EnumMember:
case SyntaxKind.FunctionDeclaration:
case SyntaxKind.FunctionExpression:
case SyntaxKind.MethodDeclaration:
case SyntaxKind.GetAccessor:
case SyntaxKind.SetAccessor:
case SyntaxKind.TypeAliasDeclaration:
errorNode = (<Declaration>node).name;
break;
case SyntaxKind.ArrowFunction:
return getErrorSpanForArrowFunction(sourceFile, <ArrowFunction>node);
}
if (errorNode === undefined) {
// If we don't have a better node, then just set the error on the first token of
// construct.
return getSpanOfTokenAtPosition(sourceFile, node.pos);
}
const pos = nodeIsMissing(errorNode)
? errorNode.pos
: skipTrivia(sourceFile.text, errorNode.pos);
return createTextSpanFromBounds(pos, errorNode.end);
}
export function isExternalOrCommonJsModule(file: SourceFile): boolean {
return (file.externalModuleIndicator || file.commonJsModuleIndicator) !== undefined;
}
export function isDeclarationFile(file: SourceFile): boolean {
return file.isDeclarationFile;
}
export function isConstEnumDeclaration(node: Node): boolean {
return node.kind === SyntaxKind.EnumDeclaration && isConst(node);
}
function walkUpBindingElementsAndPatterns(node: Node): Node {
while (node && (node.kind === SyntaxKind.BindingElement || isBindingPattern(node))) {
node = node.parent;
}
return node;
}
// Returns the node flags for this node and all relevant parent nodes. This is done so that
// nodes like variable declarations and binding elements can returned a view of their flags
// that includes the modifiers from their container. i.e. flags like export/declare aren't
// stored on the variable declaration directly, but on the containing variable statement
// (if it has one). Similarly, flags for let/const are store on the variable declaration
// list. By calling this function, all those flags are combined so that the client can treat
// the node as if it actually had those flags.
export function getCombinedNodeFlags(node: Node): NodeFlags {
node = walkUpBindingElementsAndPatterns(node);
let flags = node.flags;
if (node.kind === SyntaxKind.VariableDeclaration) {
node = node.parent;
}
if (node && node.kind === SyntaxKind.VariableDeclarationList) {
flags |= node.flags;
node = node.parent;
}
if (node && node.kind === SyntaxKind.VariableStatement) {
flags |= node.flags;
}
return flags;
}
export function isConst(node: Node): boolean {
return !!(getCombinedNodeFlags(node) & NodeFlags.Const);
}
export function isLet(node: Node): boolean {
return !!(getCombinedNodeFlags(node) & NodeFlags.Let);
}
export function isSuperCallExpression(n: Node): boolean {
return n.kind === SyntaxKind.CallExpression && (<CallExpression>n).expression.kind === SyntaxKind.SuperKeyword;
}
export function isPrologueDirective(node: Node): boolean {
return node.kind === SyntaxKind.ExpressionStatement && (<ExpressionStatement>node).expression.kind === SyntaxKind.StringLiteral;
}
export function getLeadingCommentRangesOfNode(node: Node, sourceFileOfNode: SourceFile) {
return getLeadingCommentRanges(sourceFileOfNode.text, node.pos);
}
export function getLeadingCommentRangesOfNodeFromText(node: Node, text: string) {
return getLeadingCommentRanges(text, node.pos);
}
export function getJsDocComments(node: Node, sourceFileOfNode: SourceFile) {
return getJsDocCommentsFromText(node, sourceFileOfNode.text);
}
export function getJsDocCommentsFromText(node: Node, text: string) {
const commentRanges = (node.kind === SyntaxKind.Parameter || node.kind === SyntaxKind.TypeParameter) ?
concatenate(getTrailingCommentRanges(text, node.pos),
getLeadingCommentRanges(text, node.pos)) :
getLeadingCommentRangesOfNodeFromText(node, text);
return filter(commentRanges, isJsDocComment);
function isJsDocComment(comment: CommentRange) {
// True if the comment starts with '/**' but not if it is '/**/'
return text.charCodeAt(comment.pos + 1) === CharacterCodes.asterisk &&
text.charCodeAt(comment.pos + 2) === CharacterCodes.asterisk &&
text.charCodeAt(comment.pos + 3) !== CharacterCodes.slash;
}
}
export let fullTripleSlashReferencePathRegEx = /^(\/\/\/\s*<reference\s+path\s*=\s*)('|")(.+?)\2.*?\/>/;
export let fullTripleSlashAMDReferencePathRegEx = /^(\/\/\/\s*<amd-dependency\s+path\s*=\s*)('|")(.+?)\2.*?\/>/;
export function isTypeNode(node: Node): boolean {
if (SyntaxKind.FirstTypeNode <= node.kind && node.kind <= SyntaxKind.LastTypeNode) {
return true;
}
switch (node.kind) {
case SyntaxKind.AnyKeyword:
case SyntaxKind.NumberKeyword:
case SyntaxKind.StringKeyword:
case SyntaxKind.BooleanKeyword:
case SyntaxKind.SymbolKeyword:
case SyntaxKind.UndefinedKeyword:
return true;
case SyntaxKind.VoidKeyword:
return node.parent.kind !== SyntaxKind.VoidExpression;
case SyntaxKind.ExpressionWithTypeArguments:
return !isExpressionWithTypeArgumentsInClassExtendsClause(node);
// Identifiers and qualified names may be type nodes, depending on their context. Climb
// above them to find the lowest container
case SyntaxKind.Identifier:
// If the identifier is the RHS of a qualified name, then it's a type iff its parent is.
if (node.parent.kind === SyntaxKind.QualifiedName && (<QualifiedName>node.parent).right === node) {
node = node.parent;
}
else if (node.parent.kind === SyntaxKind.PropertyAccessExpression && (<PropertyAccessExpression>node.parent).name === node) {
node = node.parent;
}
// At this point, node is either a qualified name or an identifier
Debug.assert(node.kind === SyntaxKind.Identifier || node.kind === SyntaxKind.QualifiedName || node.kind === SyntaxKind.PropertyAccessExpression,
"'node' was expected to be a qualified name, identifier or property access in 'isTypeNode'.");
case SyntaxKind.QualifiedName:
case SyntaxKind.PropertyAccessExpression:
case SyntaxKind.ThisKeyword:
let parent = node.parent;
if (parent.kind === SyntaxKind.TypeQuery) {
return false;
}
// Do not recursively call isTypeNode on the parent. In the example:
//
// let a: A.B.C;
//
// Calling isTypeNode would consider the qualified name A.B a type node. Only C or
// A.B.C is a type node.
if (SyntaxKind.FirstTypeNode <= parent.kind && parent.kind <= SyntaxKind.LastTypeNode) {
return true;
}
switch (parent.kind) {
case SyntaxKind.ExpressionWithTypeArguments:
return !isExpressionWithTypeArgumentsInClassExtendsClause(parent);
case SyntaxKind.TypeParameter:
return node === (<TypeParameterDeclaration>parent).constraint;
case SyntaxKind.PropertyDeclaration:
case SyntaxKind.PropertySignature:
case SyntaxKind.Parameter:
case SyntaxKind.VariableDeclaration:
return node === (<VariableLikeDeclaration>parent).type;
case SyntaxKind.FunctionDeclaration:
case SyntaxKind.FunctionExpression:
case SyntaxKind.ArrowFunction:
case SyntaxKind.Constructor:
case SyntaxKind.MethodDeclaration:
case SyntaxKind.MethodSignature:
case SyntaxKind.GetAccessor:
case SyntaxKind.SetAccessor:
return node === (<FunctionLikeDeclaration>parent).type;
case SyntaxKind.CallSignature:
case SyntaxKind.ConstructSignature:
case SyntaxKind.IndexSignature:
return node === (<SignatureDeclaration>parent).type;
case SyntaxKind.TypeAssertionExpression:
return node === (<TypeAssertion>parent).type;
case SyntaxKind.CallExpression:
case SyntaxKind.NewExpression:
return (<CallExpression>parent).typeArguments && indexOf((<CallExpression>parent).typeArguments, node) >= 0;
case SyntaxKind.TaggedTemplateExpression:
// TODO (drosen): TaggedTemplateExpressions may eventually support type arguments.
return false;
}
}
return false;
}
// Warning: This has the same semantics as the forEach family of functions,
// in that traversal terminates in the event that 'visitor' supplies a truthy value.
export function forEachReturnStatement<T>(body: Block, visitor: (stmt: ReturnStatement) => T): T {
return traverse(body);
function traverse(node: Node): T {
switch (node.kind) {
case SyntaxKind.ReturnStatement:
return visitor(<ReturnStatement>node);
case SyntaxKind.CaseBlock:
case SyntaxKind.Block:
case SyntaxKind.IfStatement:
case SyntaxKind.DoStatement:
case SyntaxKind.WhileStatement:
case SyntaxKind.ForStatement:
case SyntaxKind.ForInStatement:
case SyntaxKind.ForOfStatement:
case SyntaxKind.WithStatement:
case SyntaxKind.SwitchStatement:
case SyntaxKind.CaseClause:
case SyntaxKind.DefaultClause:
case SyntaxKind.LabeledStatement:
case SyntaxKind.TryStatement:
case SyntaxKind.CatchClause:
return forEachChild(node, traverse);
}
}
}
export function forEachYieldExpression(body: Block, visitor: (expr: YieldExpression) => void): void {
return traverse(body);
function traverse(node: Node): void {
switch (node.kind) {
case SyntaxKind.YieldExpression:
visitor(<YieldExpression>node);
let operand = (<YieldExpression>node).expression;
if (operand) {
traverse(operand);
}
case SyntaxKind.EnumDeclaration:
case SyntaxKind.InterfaceDeclaration:
case SyntaxKind.ModuleDeclaration:
case SyntaxKind.TypeAliasDeclaration:
case SyntaxKind.ClassDeclaration:
case SyntaxKind.ClassExpression:
// These are not allowed inside a generator now, but eventually they may be allowed
// as local types. Regardless, any yield statements contained within them should be
// skipped in this traversal.
return;
default:
if (isFunctionLike(node)) {
const name = (<FunctionLikeDeclaration>node).name;
if (name && name.kind === SyntaxKind.ComputedPropertyName) {
// Note that we will not include methods/accessors of a class because they would require
// first descending into the class. This is by design.
traverse((<ComputedPropertyName>name).expression);
return;
}
}
else if (!isTypeNode(node)) {
// This is the general case, which should include mostly expressions and statements.
// Also includes NodeArrays.
forEachChild(node, traverse);
}
}
}
}
export function isVariableLike(node: Node): node is VariableLikeDeclaration {
if (node) {
switch (node.kind) {
case SyntaxKind.BindingElement:
case SyntaxKind.EnumMember:
case SyntaxKind.Parameter:
case SyntaxKind.PropertyAssignment:
case SyntaxKind.PropertyDeclaration:
case SyntaxKind.PropertySignature:
case SyntaxKind.ShorthandPropertyAssignment:
case SyntaxKind.VariableDeclaration:
return true;
}
}
return false;
}
export function isAccessor(node: Node): node is AccessorDeclaration {
return node && (node.kind === SyntaxKind.GetAccessor || node.kind === SyntaxKind.SetAccessor);
}
export function isClassLike(node: Node): node is ClassLikeDeclaration {
return node && (node.kind === SyntaxKind.ClassDeclaration || node.kind === SyntaxKind.ClassExpression);
}
export function isFunctionLike(node: Node): node is FunctionLikeDeclaration {
return node && isFunctionLikeKind(node.kind);
}
export function isFunctionLikeKind(kind: SyntaxKind): boolean {
switch (kind) {
case SyntaxKind.Constructor:
case SyntaxKind.FunctionExpression:
case SyntaxKind.FunctionDeclaration:
case SyntaxKind.ArrowFunction:
case SyntaxKind.MethodDeclaration:
case SyntaxKind.MethodSignature:
case SyntaxKind.GetAccessor:
case SyntaxKind.SetAccessor:
case SyntaxKind.CallSignature:
case SyntaxKind.ConstructSignature:
case SyntaxKind.IndexSignature:
case SyntaxKind.FunctionType:
case SyntaxKind.ConstructorType:
return true;
}
}
export function introducesArgumentsExoticObject(node: Node) {
switch (node.kind) {
case SyntaxKind.MethodDeclaration:
case SyntaxKind.MethodSignature:
case SyntaxKind.Constructor:
case SyntaxKind.GetAccessor:
case SyntaxKind.SetAccessor:
case SyntaxKind.FunctionDeclaration:
case SyntaxKind.FunctionExpression:
return true;
}
return false;
}
export function isIterationStatement(node: Node, lookInLabeledStatements: boolean): boolean {
switch (node.kind) {
case SyntaxKind.ForStatement:
case SyntaxKind.ForInStatement:
case SyntaxKind.ForOfStatement:
case SyntaxKind.DoStatement:
case SyntaxKind.WhileStatement:
return true;
case SyntaxKind.LabeledStatement:
return lookInLabeledStatements && isIterationStatement((<LabeledStatement>node).statement, lookInLabeledStatements);
}
return false;
}
export function isFunctionBlock(node: Node) {
return node && node.kind === SyntaxKind.Block && isFunctionLike(node.parent);
}
export function isObjectLiteralMethod(node: Node): node is MethodDeclaration {
return node && node.kind === SyntaxKind.MethodDeclaration && node.parent.kind === SyntaxKind.ObjectLiteralExpression;
}
export function isIdentifierTypePredicate(predicate: TypePredicate): predicate is IdentifierTypePredicate {
return predicate && predicate.kind === TypePredicateKind.Identifier;
}
export function isThisTypePredicate(predicate: TypePredicate): predicate is ThisTypePredicate {
return predicate && predicate.kind === TypePredicateKind.This;
}
export function getContainingFunction(node: Node): FunctionLikeDeclaration {
while (true) {
node = node.parent;
if (!node || isFunctionLike(node)) {
return <FunctionLikeDeclaration>node;
}
}
}
export function getContainingClass(node: Node): ClassLikeDeclaration {
while (true) {
node = node.parent;
if (!node || isClassLike(node)) {
return <ClassLikeDeclaration>node;
}
}
}
export function getThisContainer(node: Node, includeArrowFunctions: boolean): Node {
while (true) {
node = node.parent;
if (!node) {
return undefined;
}
switch (node.kind) {
case SyntaxKind.ComputedPropertyName:
// If the grandparent node is an object literal (as opposed to a class),
// then the computed property is not a 'this' container.
// A computed property name in a class needs to be a this container
// so that we can error on it.
if (isClassLike(node.parent.parent)) {
return node;
}
// If this is a computed property, then the parent should not
// make it a this container. The parent might be a property
// in an object literal, like a method or accessor. But in order for
// such a parent to be a this container, the reference must be in
// the *body* of the container.
node = node.parent;
break;
case SyntaxKind.Decorator:
// Decorators are always applied outside of the body of a class or method.
if (node.parent.kind === SyntaxKind.Parameter && isClassElement(node.parent.parent)) {
// If the decorator's parent is a Parameter, we resolve the this container from
// the grandparent class declaration.
node = node.parent.parent;
}
else if (isClassElement(node.parent)) {
// If the decorator's parent is a class element, we resolve the 'this' container
// from the parent class declaration.
node = node.parent;
}
break;
case SyntaxKind.ArrowFunction:
if (!includeArrowFunctions) {
continue;
}
// Fall through
case SyntaxKind.FunctionDeclaration:
case SyntaxKind.FunctionExpression:
case SyntaxKind.ModuleDeclaration:
case SyntaxKind.PropertyDeclaration:
case SyntaxKind.PropertySignature:
case SyntaxKind.MethodDeclaration:
case SyntaxKind.MethodSignature:
case SyntaxKind.Constructor:
case SyntaxKind.GetAccessor:
case SyntaxKind.SetAccessor:
case SyntaxKind.CallSignature:
case SyntaxKind.ConstructSignature:
case SyntaxKind.IndexSignature:
case SyntaxKind.EnumDeclaration:
case SyntaxKind.SourceFile:
return node;
}
}
}
/**
* Given an super call\property node returns a closest node where either
* - super call\property is legal in the node and not legal in the parent node the node.
* i.e. super call is legal in constructor but not legal in the class body.
* - node is arrow function (so caller might need to call getSuperContainer in case it needs to climb higher)
* - super call\property is definitely illegal in the node (but might be legal in some subnode)
* i.e. super property access is illegal in function declaration but can be legal in the statement list
*/
export function getSuperContainer(node: Node, stopOnFunctions: boolean): Node {
while (true) {
node = node.parent;
if (!node) {
return node;
}
switch (node.kind) {
case SyntaxKind.ComputedPropertyName:
node = node.parent;
break;
case SyntaxKind.FunctionDeclaration:
case SyntaxKind.FunctionExpression:
case SyntaxKind.ArrowFunction:
if (!stopOnFunctions) {
continue;
}
case SyntaxKind.PropertyDeclaration:
case SyntaxKind.PropertySignature:
case SyntaxKind.MethodDeclaration:
case SyntaxKind.MethodSignature:
case SyntaxKind.Constructor:
case SyntaxKind.GetAccessor:
case SyntaxKind.SetAccessor:
return node;
case SyntaxKind.Decorator:
// Decorators are always applied outside of the body of a class or method.
if (node.parent.kind === SyntaxKind.Parameter && isClassElement(node.parent.parent)) {
// If the decorator's parent is a Parameter, we resolve the this container from
// the grandparent class declaration.
node = node.parent.parent;
}
else if (isClassElement(node.parent)) {
// If the decorator's parent is a class element, we resolve the 'this' container
// from the parent class declaration.
node = node.parent;
}
break;
}
}
}
/**
* Determines whether a node is a property or element access expression for super.
*/
export function isSuperPropertyOrElementAccess(node: Node) {
return (node.kind === SyntaxKind.PropertyAccessExpression
|| node.kind === SyntaxKind.ElementAccessExpression)
&& (<PropertyAccessExpression | ElementAccessExpression>node).expression.kind === SyntaxKind.SuperKeyword;
}
export function getEntityNameFromTypeNode(node: TypeNode): EntityName | Expression {
if (node) {
switch (node.kind) {
case SyntaxKind.TypeReference:
return (<TypeReferenceNode>node).typeName;
case SyntaxKind.ExpressionWithTypeArguments:
return (<ExpressionWithTypeArguments>node).expression;
case SyntaxKind.Identifier:
case SyntaxKind.QualifiedName:
return (<EntityName><Node>node);
}
}
return undefined;
}
export function getInvokedExpression(node: CallLikeExpression): Expression {
if (node.kind === SyntaxKind.TaggedTemplateExpression) {
return (<TaggedTemplateExpression>node).tag;
}
// Will either be a CallExpression, NewExpression, or Decorator.
return (<CallExpression | Decorator>node).expression;
}
export function nodeCanBeDecorated(node: Node): boolean {
switch (node.kind) {
case SyntaxKind.ClassDeclaration:
// classes are valid targets
return true;
case SyntaxKind.PropertyDeclaration:
// property declarations are valid if their parent is a class declaration.
return node.parent.kind === SyntaxKind.ClassDeclaration;
case SyntaxKind.GetAccessor:
case SyntaxKind.SetAccessor:
case SyntaxKind.MethodDeclaration:
// if this method has a body and its parent is a class declaration, this is a valid target.
return (<FunctionLikeDeclaration>node).body !== undefined
&& node.parent.kind === SyntaxKind.ClassDeclaration;
case SyntaxKind.Parameter:
// if the parameter's parent has a body and its grandparent is a class declaration, this is a valid target;
return (<FunctionLikeDeclaration>node.parent).body !== undefined
&& (node.parent.kind === SyntaxKind.Constructor
|| node.parent.kind === SyntaxKind.MethodDeclaration
|| node.parent.kind === SyntaxKind.SetAccessor)
&& node.parent.parent.kind === SyntaxKind.ClassDeclaration;
}
return false;
}
export function nodeIsDecorated(node: Node): boolean {
return node.decorators !== undefined
&& nodeCanBeDecorated(node);
}
export function isPropertyAccessExpression(node: Node): node is PropertyAccessExpression {
return node.kind === SyntaxKind.PropertyAccessExpression;
}
export function isElementAccessExpression(node: Node): node is ElementAccessExpression {
return node.kind === SyntaxKind.ElementAccessExpression;
}
export function isJSXTagName(node: Node) {
const parent = node.parent;