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1059 lines (935 loc) · 55.8 KB
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/// <reference path="parser.ts"/>
/* @internal */
namespace ts {
export let bindTime = 0;
export const enum ModuleInstanceState {
NonInstantiated = 0,
Instantiated = 1,
ConstEnumOnly = 2
}
export function getModuleInstanceState(node: Node): ModuleInstanceState {
// A module is uninstantiated if it contains only
// 1. interface declarations, type alias declarations
if (node.kind === SyntaxKind.InterfaceDeclaration || node.kind === SyntaxKind.TypeAliasDeclaration) {
return ModuleInstanceState.NonInstantiated;
}
// 2. const enum declarations
else if (isConstEnumDeclaration(node)) {
return ModuleInstanceState.ConstEnumOnly;
}
// 3. non-exported import declarations
else if ((node.kind === SyntaxKind.ImportDeclaration || node.kind === SyntaxKind.ImportEqualsDeclaration) && !(node.flags & NodeFlags.Export)) {
return ModuleInstanceState.NonInstantiated;
}
// 4. other uninstantiated module declarations.
else if (node.kind === SyntaxKind.ModuleBlock) {
let state = ModuleInstanceState.NonInstantiated;
forEachChild(node, n => {
switch (getModuleInstanceState(n)) {
case ModuleInstanceState.NonInstantiated:
// child is non-instantiated - continue searching
return false;
case ModuleInstanceState.ConstEnumOnly:
// child is const enum only - record state and continue searching
state = ModuleInstanceState.ConstEnumOnly;
return false;
case ModuleInstanceState.Instantiated:
// child is instantiated - record state and stop
state = ModuleInstanceState.Instantiated;
return true;
}
});
return state;
}
else if (node.kind === SyntaxKind.ModuleDeclaration) {
return getModuleInstanceState((<ModuleDeclaration>node).body);
}
else {
return ModuleInstanceState.Instantiated;
}
}
const enum ContainerFlags {
// The current node is not a container, and no container manipulation should happen before
// recursing into it.
None = 0,
// The current node is a container. It should be set as the current container (and block-
// container) before recursing into it. The current node does not have locals. Examples:
//
// Classes, ObjectLiterals, TypeLiterals, Interfaces...
IsContainer = 1 << 0,
// The current node is a block-scoped-container. It should be set as the current block-
// container before recursing into it. Examples:
//
// Blocks (when not parented by functions), Catch clauses, For/For-in/For-of statements...
IsBlockScopedContainer = 1 << 1,
HasLocals = 1 << 2,
// If the current node is a container that also container that also contains locals. Examples:
//
// Functions, Methods, Modules, Source-files.
IsContainerWithLocals = IsContainer | HasLocals
}
export function bindSourceFile(file: SourceFile) {
let start = new Date().getTime();
bindSourceFileWorker(file);
bindTime += new Date().getTime() - start;
}
function bindSourceFileWorker(file: SourceFile) {
let parent: Node;
let container: Node;
let blockScopeContainer: Node;
let lastContainer: Node;
// If this file is an external module, then it is automatically in strict-mode according to
// ES6. If it is not an external module, then we'll determine if it is in strict mode or
// not depending on if we see "use strict" in certain places (or if we hit a class/namespace).
let inStrictMode = !!file.externalModuleIndicator;
let symbolCount = 0;
let Symbol = objectAllocator.getSymbolConstructor();
let classifiableNames: Map<string> = {};
if (!file.locals) {
bind(file);
file.symbolCount = symbolCount;
file.classifiableNames = classifiableNames;
}
return;
function createSymbol(flags: SymbolFlags, name: string): Symbol {
symbolCount++;
return new Symbol(flags, name);
}
function addDeclarationToSymbol(symbol: Symbol, node: Declaration, symbolFlags: SymbolFlags) {
symbol.flags |= symbolFlags;
node.symbol = symbol;
if (!symbol.declarations) {
symbol.declarations = [];
}
symbol.declarations.push(node);
if (symbolFlags & SymbolFlags.HasExports && !symbol.exports) {
symbol.exports = {};
}
if (symbolFlags & SymbolFlags.HasMembers && !symbol.members) {
symbol.members = {};
}
if (symbolFlags & SymbolFlags.Value && !symbol.valueDeclaration) {
symbol.valueDeclaration = node;
}
}
// Should not be called on a declaration with a computed property name,
// unless it is a well known Symbol.
function getDeclarationName(node: Declaration): string {
if (node.name) {
if (node.kind === SyntaxKind.ModuleDeclaration && node.name.kind === SyntaxKind.StringLiteral) {
return '"' + (<LiteralExpression>node.name).text + '"';
}
if (node.name.kind === SyntaxKind.ComputedPropertyName) {
let nameExpression = (<ComputedPropertyName>node.name).expression;
Debug.assert(isWellKnownSymbolSyntactically(nameExpression));
return getPropertyNameForKnownSymbolName((<PropertyAccessExpression>nameExpression).name.text);
}
return (<Identifier | LiteralExpression>node.name).text;
}
switch (node.kind) {
case SyntaxKind.Constructor:
return "__constructor";
case SyntaxKind.FunctionType:
case SyntaxKind.CallSignature:
return "__call";
case SyntaxKind.ConstructorType:
case SyntaxKind.ConstructSignature:
return "__new";
case SyntaxKind.IndexSignature:
return "__index";
case SyntaxKind.ExportDeclaration:
return "__export";
case SyntaxKind.ExportAssignment:
return (<ExportAssignment>node).isExportEquals ? "export=" : "default";
case SyntaxKind.FunctionDeclaration:
case SyntaxKind.ClassDeclaration:
return node.flags & NodeFlags.Default ? "default" : undefined;
}
}
function getDisplayName(node: Declaration): string {
return node.name ? declarationNameToString(node.name) : getDeclarationName(node);
}
/**
* Declares a Symbol for the node and adds it to symbols. Reports errors for conflicting identifier names.
* @param symbolTable - The symbol table which node will be added to.
* @param parent - node's parent declaration.
* @param node - The declaration to be added to the symbol table
* @param includes - The SymbolFlags that node has in addition to its declaration type (eg: export, ambient, etc.)
* @param excludes - The flags which node cannot be declared alongside in a symbol table. Used to report forbidden declarations.
*/
function declareSymbol(symbolTable: SymbolTable, parent: Symbol, node: Declaration, includes: SymbolFlags, excludes: SymbolFlags): Symbol {
Debug.assert(!hasDynamicName(node));
// The exported symbol for an export default function/class node is always named "default"
let name = node.flags & NodeFlags.Default && parent ? "default" : getDeclarationName(node);
let symbol: Symbol;
if (name !== undefined) {
// Check and see if the symbol table already has a symbol with this name. If not,
// create a new symbol with this name and add it to the table. Note that we don't
// give the new symbol any flags *yet*. This ensures that it will not conflict
// with the 'excludes' flags we pass in.
//
// If we do get an existing symbol, see if it conflicts with the new symbol we're
// creating. For example, a 'var' symbol and a 'class' symbol will conflict within
// the same symbol table. If we have a conflict, report the issue on each
// declaration we have for this symbol, and then create a new symbol for this
// declaration.
//
// If we created a new symbol, either because we didn't have a symbol with this name
// in the symbol table, or we conflicted with an existing symbol, then just add this
// node as the sole declaration of the new symbol.
//
// Otherwise, we'll be merging into a compatible existing symbol (for example when
// you have multiple 'vars' with the same name in the same container). In this case
// just add this node into the declarations list of the symbol.
symbol = hasProperty(symbolTable, name)
? symbolTable[name]
: (symbolTable[name] = createSymbol(SymbolFlags.None, name));
if (name && (includes & SymbolFlags.Classifiable)) {
classifiableNames[name] = name;
}
if (symbol.flags & excludes) {
if (node.name) {
node.name.parent = node;
}
// Report errors every position with duplicate declaration
// Report errors on previous encountered declarations
let message = symbol.flags & SymbolFlags.BlockScopedVariable
? Diagnostics.Cannot_redeclare_block_scoped_variable_0
: Diagnostics.Duplicate_identifier_0;
forEach(symbol.declarations, declaration => {
file.bindDiagnostics.push(createDiagnosticForNode(declaration.name || declaration, message, getDisplayName(declaration)));
});
file.bindDiagnostics.push(createDiagnosticForNode(node.name || node, message, getDisplayName(node)));
symbol = createSymbol(SymbolFlags.None, name);
}
}
else {
symbol = createSymbol(SymbolFlags.None, "__missing");
}
addDeclarationToSymbol(symbol, node, includes);
symbol.parent = parent;
return symbol;
}
function declareModuleMember(node: Declaration, symbolFlags: SymbolFlags, symbolExcludes: SymbolFlags): Symbol {
let hasExportModifier = getCombinedNodeFlags(node) & NodeFlags.Export;
if (symbolFlags & SymbolFlags.Alias) {
if (node.kind === SyntaxKind.ExportSpecifier || (node.kind === SyntaxKind.ImportEqualsDeclaration && hasExportModifier)) {
return declareSymbol(container.symbol.exports, container.symbol, node, symbolFlags, symbolExcludes);
}
else {
return declareSymbol(container.locals, undefined, node, symbolFlags, symbolExcludes);
}
}
else {
// Exported module members are given 2 symbols: A local symbol that is classified with an ExportValue,
// ExportType, or ExportContainer flag, and an associated export symbol with all the correct flags set
// on it. There are 2 main reasons:
//
// 1. We treat locals and exports of the same name as mutually exclusive within a container.
// That means the binder will issue a Duplicate Identifier error if you mix locals and exports
// with the same name in the same container.
// TODO: Make this a more specific error and decouple it from the exclusion logic.
// 2. When we checkIdentifier in the checker, we set its resolved symbol to the local symbol,
// but return the export symbol (by calling getExportSymbolOfValueSymbolIfExported). That way
// when the emitter comes back to it, it knows not to qualify the name if it was found in a containing scope.
if (hasExportModifier || container.flags & NodeFlags.ExportContext) {
let exportKind =
(symbolFlags & SymbolFlags.Value ? SymbolFlags.ExportValue : 0) |
(symbolFlags & SymbolFlags.Type ? SymbolFlags.ExportType : 0) |
(symbolFlags & SymbolFlags.Namespace ? SymbolFlags.ExportNamespace : 0);
let local = declareSymbol(container.locals, undefined, node, exportKind, symbolExcludes);
local.exportSymbol = declareSymbol(container.symbol.exports, container.symbol, node, symbolFlags, symbolExcludes);
node.localSymbol = local;
return local;
}
else {
return declareSymbol(container.locals, undefined, node, symbolFlags, symbolExcludes);
}
}
}
// All container nodes are kept on a linked list in declaration order. This list is used by
// the getLocalNameOfContainer function in the type checker to validate that the local name
// used for a container is unique.
function bindChildren(node: Node) {
// Before we recurse into a node's chilren, we first save the existing parent, container
// and block-container. Then after we pop out of processing the children, we restore
// these saved values.
let saveParent = parent;
let saveContainer = container;
let savedBlockScopeContainer = blockScopeContainer;
// This node will now be set as the parent of all of its children as we recurse into them.
parent = node;
// Depending on what kind of node this is, we may have to adjust the current container
// and block-container. If the current node is a container, then it is automatically
// considered the current block-container as well. Also, for containers that we know
// may contain locals, we proactively initialize the .locals field. We do this because
// it's highly likely that the .locals will be needed to place some child in (for example,
// a parameter, or variable declaration).
//
// However, we do not proactively create the .locals for block-containers because it's
// totally normal and common for block-containers to never actually have a block-scoped
// variable in them. We don't want to end up allocating an object for every 'block' we
// run into when most of them won't be necessary.
//
// Finally, if this is a block-container, then we clear out any existing .locals object
// it may contain within it. This happens in incremental scenarios. Because we can be
// reusing a node from a previous compilation, that node may have had 'locals' created
// for it. We must clear this so we don't accidently move any stale data forward from
// a previous compilation.
let containerFlags = getContainerFlags(node);
if (containerFlags & ContainerFlags.IsContainer) {
container = blockScopeContainer = node;
if (containerFlags & ContainerFlags.HasLocals) {
container.locals = {};
}
addToContainerChain(container);
}
else if (containerFlags & ContainerFlags.IsBlockScopedContainer) {
blockScopeContainer = node;
blockScopeContainer.locals = undefined;
}
forEachChild(node, bind);
container = saveContainer;
parent = saveParent;
blockScopeContainer = savedBlockScopeContainer;
}
function getContainerFlags(node: Node): ContainerFlags {
switch (node.kind) {
case SyntaxKind.ClassExpression:
case SyntaxKind.ClassDeclaration:
case SyntaxKind.InterfaceDeclaration:
case SyntaxKind.EnumDeclaration:
case SyntaxKind.TypeLiteral:
case SyntaxKind.ObjectLiteralExpression:
return ContainerFlags.IsContainer;
case SyntaxKind.CallSignature:
case SyntaxKind.ConstructSignature:
case SyntaxKind.IndexSignature:
case SyntaxKind.MethodDeclaration:
case SyntaxKind.MethodSignature:
case SyntaxKind.FunctionDeclaration:
case SyntaxKind.Constructor:
case SyntaxKind.GetAccessor:
case SyntaxKind.SetAccessor:
case SyntaxKind.FunctionType:
case SyntaxKind.ConstructorType:
case SyntaxKind.FunctionExpression:
case SyntaxKind.ArrowFunction:
case SyntaxKind.ModuleDeclaration:
case SyntaxKind.SourceFile:
case SyntaxKind.TypeAliasDeclaration:
return ContainerFlags.IsContainerWithLocals;
case SyntaxKind.CatchClause:
case SyntaxKind.ForStatement:
case SyntaxKind.ForInStatement:
case SyntaxKind.ForOfStatement:
case SyntaxKind.CaseBlock:
return ContainerFlags.IsBlockScopedContainer;
case SyntaxKind.Block:
// do not treat blocks directly inside a function as a block-scoped-container.
// Locals that reside in this block should go to the function locals. Othewise 'x'
// would not appear to be a redeclaration of a block scoped local in the following
// example:
//
// function foo() {
// var x;
// let x;
// }
//
// If we placed 'var x' into the function locals and 'let x' into the locals of
// the block, then there would be no collision.
//
// By not creating a new block-scoped-container here, we ensure that both 'var x'
// and 'let x' go into the Function-container's locals, and we do get a collision
// conflict.
return isFunctionLike(node.parent) ? ContainerFlags.None : ContainerFlags.IsBlockScopedContainer;
}
return ContainerFlags.None;
}
function addToContainerChain(next: Node) {
if (lastContainer) {
lastContainer.nextContainer = next;
}
lastContainer = next;
}
function declareSymbolAndAddToSymbolTable(node: Declaration, symbolFlags: SymbolFlags, symbolExcludes: SymbolFlags): void {
// Just call this directly so that the return type of this function stays "void".
declareSymbolAndAddToSymbolTableWorker(node, symbolFlags, symbolExcludes);
}
function declareSymbolAndAddToSymbolTableWorker(node: Declaration, symbolFlags: SymbolFlags, symbolExcludes: SymbolFlags): Symbol {
switch (container.kind) {
// Modules, source files, and classes need specialized handling for how their
// members are declared (for example, a member of a class will go into a specific
// symbol table depending on if it is static or not). We defer to specialized
// handlers to take care of declaring these child members.
case SyntaxKind.ModuleDeclaration:
return declareModuleMember(node, symbolFlags, symbolExcludes);
case SyntaxKind.SourceFile:
return declareSourceFileMember(node, symbolFlags, symbolExcludes);
case SyntaxKind.ClassExpression:
case SyntaxKind.ClassDeclaration:
return declareClassMember(node, symbolFlags, symbolExcludes);
case SyntaxKind.EnumDeclaration:
return declareSymbol(container.symbol.exports, container.symbol, node, symbolFlags, symbolExcludes);
case SyntaxKind.TypeLiteral:
case SyntaxKind.ObjectLiteralExpression:
case SyntaxKind.InterfaceDeclaration:
// Interface/Object-types always have their children added to the 'members' of
// their container. They are only accessible through an instance of their
// container, and are never in scope otherwise (even inside the body of the
// object / type / interface declaring them). An exception is type parameters,
// which are in scope without qualification (similar to 'locals').
return declareSymbol(container.symbol.members, container.symbol, node, symbolFlags, symbolExcludes);
case SyntaxKind.FunctionType:
case SyntaxKind.ConstructorType:
case SyntaxKind.CallSignature:
case SyntaxKind.ConstructSignature:
case SyntaxKind.IndexSignature:
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.TypeAliasDeclaration:
// All the children of these container types are never visible through another
// symbol (i.e. through another symbol's 'exports' or 'members'). Instead,
// they're only accessed 'lexically' (i.e. from code that exists underneath
// their container in the tree. To accomplish this, we simply add their declared
// symbol to the 'locals' of the container. These symbols can then be found as
// the type checker walks up the containers, checking them for matching names.
return declareSymbol(container.locals, undefined, node, symbolFlags, symbolExcludes);
}
}
function declareClassMember(node: Declaration, symbolFlags: SymbolFlags, symbolExcludes: SymbolFlags) {
return node.flags & NodeFlags.Static
? declareSymbol(container.symbol.exports, container.symbol, node, symbolFlags, symbolExcludes)
: declareSymbol(container.symbol.members, container.symbol, node, symbolFlags, symbolExcludes);
}
function declareSourceFileMember(node: Declaration, symbolFlags: SymbolFlags, symbolExcludes: SymbolFlags) {
return isExternalModule(file)
? declareModuleMember(node, symbolFlags, symbolExcludes)
: declareSymbol(file.locals, undefined, node, symbolFlags, symbolExcludes);
}
function isAmbientContext(node: Node): boolean {
while (node) {
if (node.flags & NodeFlags.Ambient) {
return true;
}
node = node.parent;
}
return false;
}
function hasExportDeclarations(node: ModuleDeclaration | SourceFile): boolean {
let body = node.kind === SyntaxKind.SourceFile ? node : (<ModuleDeclaration>node).body;
if (body.kind === SyntaxKind.SourceFile || body.kind === SyntaxKind.ModuleBlock) {
for (let stat of (<Block>body).statements) {
if (stat.kind === SyntaxKind.ExportDeclaration || stat.kind === SyntaxKind.ExportAssignment) {
return true;
}
}
}
return false;
}
function setExportContextFlag(node: ModuleDeclaration | SourceFile) {
// A declaration source file or ambient module declaration that contains no export declarations (but possibly regular
// declarations with export modifiers) is an export context in which declarations are implicitly exported.
if (isAmbientContext(node) && !hasExportDeclarations(node)) {
node.flags |= NodeFlags.ExportContext;
}
else {
node.flags &= ~NodeFlags.ExportContext;
}
}
function bindModuleDeclaration(node: ModuleDeclaration) {
setExportContextFlag(node);
if (node.name.kind === SyntaxKind.StringLiteral) {
declareSymbolAndAddToSymbolTable(node, SymbolFlags.ValueModule, SymbolFlags.ValueModuleExcludes);
}
else {
let state = getModuleInstanceState(node);
if (state === ModuleInstanceState.NonInstantiated) {
declareSymbolAndAddToSymbolTable(node, SymbolFlags.NamespaceModule, SymbolFlags.NamespaceModuleExcludes);
}
else {
declareSymbolAndAddToSymbolTable(node, SymbolFlags.ValueModule, SymbolFlags.ValueModuleExcludes);
let currentModuleIsConstEnumOnly = state === ModuleInstanceState.ConstEnumOnly;
if (node.symbol.constEnumOnlyModule === undefined) {
// non-merged case - use the current state
node.symbol.constEnumOnlyModule = currentModuleIsConstEnumOnly;
}
else {
// merged case: module is const enum only if all its pieces are non-instantiated or const enum
node.symbol.constEnumOnlyModule = node.symbol.constEnumOnlyModule && currentModuleIsConstEnumOnly;
}
}
}
}
function bindFunctionOrConstructorType(node: SignatureDeclaration) {
// For a given function symbol "<...>(...) => T" we want to generate a symbol identical
// to the one we would get for: { <...>(...): T }
//
// We do that by making an anonymous type literal symbol, and then setting the function
// symbol as its sole member. To the rest of the system, this symbol will be indistinguishable
// from an actual type literal symbol you would have gotten had you used the long form.
let symbol = createSymbol(SymbolFlags.Signature, getDeclarationName(node));
addDeclarationToSymbol(symbol, node, SymbolFlags.Signature);
let typeLiteralSymbol = createSymbol(SymbolFlags.TypeLiteral, "__type");
addDeclarationToSymbol(typeLiteralSymbol, node, SymbolFlags.TypeLiteral);
typeLiteralSymbol.members = { [symbol.name]: symbol };
}
function bindObjectLiteralExpression(node: ObjectLiteralExpression) {
const enum ElementKind {
Property = 1,
Accessor = 2
}
if (inStrictMode) {
let seen: Map<ElementKind> = {};
for (let prop of node.properties) {
if (prop.name.kind !== SyntaxKind.Identifier) {
continue;
}
let identifier = <Identifier>prop.name;
// ECMA-262 11.1.5 Object Initialiser
// If previous is not undefined then throw a SyntaxError exception if any of the following conditions are true
// a.This production is contained in strict code and IsDataDescriptor(previous) is true and
// IsDataDescriptor(propId.descriptor) is true.
// b.IsDataDescriptor(previous) is true and IsAccessorDescriptor(propId.descriptor) is true.
// c.IsAccessorDescriptor(previous) is true and IsDataDescriptor(propId.descriptor) is true.
// d.IsAccessorDescriptor(previous) is true and IsAccessorDescriptor(propId.descriptor) is true
// and either both previous and propId.descriptor have[[Get]] fields or both previous and propId.descriptor have[[Set]] fields
let currentKind = prop.kind === SyntaxKind.PropertyAssignment || prop.kind === SyntaxKind.ShorthandPropertyAssignment || prop.kind === SyntaxKind.MethodDeclaration
? ElementKind.Property
: ElementKind.Accessor;
let existingKind = seen[identifier.text];
if (!existingKind) {
seen[identifier.text] = currentKind;
continue;
}
if (currentKind === ElementKind.Property && existingKind === ElementKind.Property) {
let span = getErrorSpanForNode(file, identifier);
file.bindDiagnostics.push(createFileDiagnostic(file, span.start, span.length,
Diagnostics.An_object_literal_cannot_have_multiple_properties_with_the_same_name_in_strict_mode));
}
}
}
return bindAnonymousDeclaration(node, SymbolFlags.ObjectLiteral, "__object");
}
function bindAnonymousDeclaration(node: Declaration, symbolFlags: SymbolFlags, name: string) {
let symbol = createSymbol(symbolFlags, name);
addDeclarationToSymbol(symbol, node, symbolFlags);
}
function bindBlockScopedDeclaration(node: Declaration, symbolFlags: SymbolFlags, symbolExcludes: SymbolFlags) {
switch (blockScopeContainer.kind) {
case SyntaxKind.ModuleDeclaration:
declareModuleMember(node, symbolFlags, symbolExcludes);
break;
case SyntaxKind.SourceFile:
if (isExternalModule(<SourceFile>container)) {
declareModuleMember(node, symbolFlags, symbolExcludes);
break;
}
// fall through.
default:
if (!blockScopeContainer.locals) {
blockScopeContainer.locals = {};
addToContainerChain(blockScopeContainer);
}
declareSymbol(blockScopeContainer.locals, undefined, node, symbolFlags, symbolExcludes);
}
}
function bindBlockScopedVariableDeclaration(node: Declaration) {
bindBlockScopedDeclaration(node, SymbolFlags.BlockScopedVariable, SymbolFlags.BlockScopedVariableExcludes);
}
// The binder visits every node in the syntax tree so it is a convenient place to perform a single localized
// check for reserved words used as identifiers in strict mode code.
function checkStrictModeIdentifier(node: Identifier) {
if (inStrictMode &&
node.originalKeywordKind >= SyntaxKind.FirstFutureReservedWord &&
node.originalKeywordKind <= SyntaxKind.LastFutureReservedWord &&
!isIdentifierName(node)) {
// Report error only if there are no parse errors in file
if (!file.parseDiagnostics.length) {
file.bindDiagnostics.push(createDiagnosticForNode(node,
getStrictModeIdentifierMessage(node), declarationNameToString(node)));
}
}
}
function getStrictModeIdentifierMessage(node: Node) {
// Provide specialized messages to help the user understand why we think they're in
// strict mode.
if (getContainingClass(node)) {
return Diagnostics.Identifier_expected_0_is_a_reserved_word_in_strict_mode_Class_definitions_are_automatically_in_strict_mode;
}
if (file.externalModuleIndicator) {
return Diagnostics.Identifier_expected_0_is_a_reserved_word_in_strict_mode_Modules_are_automatically_in_strict_mode;
}
return Diagnostics.Identifier_expected_0_is_a_reserved_word_in_strict_mode;
}
function checkStrictModeBinaryExpression(node: BinaryExpression) {
if (inStrictMode && isLeftHandSideExpression(node.left) && isAssignmentOperator(node.operatorToken.kind)) {
// ECMA 262 (Annex C) The identifier eval or arguments may not appear as the LeftHandSideExpression of an
// Assignment operator(11.13) or of a PostfixExpression(11.3)
checkStrictModeEvalOrArguments(node, <Identifier>node.left);
}
}
function checkStrictModeCatchClause(node: CatchClause) {
// It is a SyntaxError if a TryStatement with a Catch occurs within strict code and the Identifier of the
// Catch production is eval or arguments
if (inStrictMode && node.variableDeclaration) {
checkStrictModeEvalOrArguments(node, node.variableDeclaration.name);
}
}
function checkStrictModeDeleteExpression(node: DeleteExpression) {
// Grammar checking
if (inStrictMode && node.expression.kind === SyntaxKind.Identifier) {
// When a delete operator occurs within strict mode code, a SyntaxError is thrown if its
// UnaryExpression is a direct reference to a variable, function argument, or function name
let span = getErrorSpanForNode(file, node.expression);
file.bindDiagnostics.push(createFileDiagnostic(file, span.start, span.length, Diagnostics.delete_cannot_be_called_on_an_identifier_in_strict_mode));
}
}
function isEvalOrArgumentsIdentifier(node: Node): boolean {
return node.kind === SyntaxKind.Identifier &&
((<Identifier>node).text === "eval" || (<Identifier>node).text === "arguments");
}
function checkStrictModeEvalOrArguments(contextNode: Node, name: Node) {
if (name && name.kind === SyntaxKind.Identifier) {
let identifier = <Identifier>name;
if (isEvalOrArgumentsIdentifier(identifier)) {
// We check first if the name is inside class declaration or class expression; if so give explicit message
// otherwise report generic error message.
let span = getErrorSpanForNode(file, name);
file.bindDiagnostics.push(createFileDiagnostic(file, span.start, span.length,
getStrictModeEvalOrArgumentsMessage(contextNode), identifier.text));
}
}
}
function getStrictModeEvalOrArgumentsMessage(node: Node) {
// Provide specialized messages to help the user understand why we think they're in
// strict mode.
if (getContainingClass(node)) {
return Diagnostics.Invalid_use_of_0_Class_definitions_are_automatically_in_strict_mode;
}
if (file.externalModuleIndicator) {
return Diagnostics.Invalid_use_of_0_Modules_are_automatically_in_strict_mode;
}
return Diagnostics.Invalid_use_of_0_in_strict_mode;
}
function checkStrictModeFunctionName(node: FunctionLikeDeclaration) {
if (inStrictMode) {
// It is a SyntaxError if the identifier eval or arguments appears within a FormalParameterList of a strict mode FunctionDeclaration or FunctionExpression (13.1))
checkStrictModeEvalOrArguments(node, node.name);
}
}
function checkStrictModeNumericLiteral(node: LiteralExpression) {
if (inStrictMode && node.flags & NodeFlags.OctalLiteral) {
file.bindDiagnostics.push(createDiagnosticForNode(node, Diagnostics.Octal_literals_are_not_allowed_in_strict_mode));
}
}
function checkStrictModePostfixUnaryExpression(node: PostfixUnaryExpression) {
// Grammar checking
// The identifier eval or arguments may not appear as the LeftHandSideExpression of an
// Assignment operator(11.13) or of a PostfixExpression(11.3) or as the UnaryExpression
// operated upon by a Prefix Increment(11.4.4) or a Prefix Decrement(11.4.5) operator.
if (inStrictMode) {
checkStrictModeEvalOrArguments(node, <Identifier>node.operand);
}
}
function checkStrictModePrefixUnaryExpression(node: PrefixUnaryExpression) {
// Grammar checking
if (inStrictMode) {
if (node.operator === SyntaxKind.PlusPlusToken || node.operator === SyntaxKind.MinusMinusToken) {
checkStrictModeEvalOrArguments(node, <Identifier>node.operand);
}
}
}
function checkStrictModeWithStatement(node: WithStatement) {
// Grammar checking for withStatement
if (inStrictMode) {
grammarErrorOnFirstToken(node, Diagnostics.with_statements_are_not_allowed_in_strict_mode);
}
}
function grammarErrorOnFirstToken(node: Node, message: DiagnosticMessage, arg0?: any, arg1?: any, arg2?: any) {
let span = getSpanOfTokenAtPosition(file, node.pos);
file.bindDiagnostics.push(createFileDiagnostic(file, span.start, span.length, message, arg0, arg1, arg2));
}
function getDestructuringParameterName(node: Declaration) {
return "__" + indexOf((<SignatureDeclaration>node.parent).parameters, node);
}
function bind(node: Node) {
node.parent = parent;
let savedInStrictMode = inStrictMode;
if (!savedInStrictMode) {
updateStrictMode(node);
}
// First we bind declaration nodes to a symbol if possible. We'll both create a symbol
// and then potentially add the symbol to an appropriate symbol table. Possible
// destination symbol tables are:
//
// 1) The 'exports' table of the current container's symbol.
// 2) The 'members' table of the current container's symbol.
// 3) The 'locals' table of the current container.
//
// However, not all symbols will end up in any of these tables. 'Anonymous' symbols
// (like TypeLiterals for example) will not be put in any table.
bindWorker(node);
// Then we recurse into the children of the node to bind them as well. For certain
// symbols we do specialized work when we recurse. For example, we'll keep track of
// the current 'container' node when it changes. This helps us know which symbol table
// a local should go into for example.
bindChildren(node);
inStrictMode = savedInStrictMode;
}
function updateStrictMode(node: Node) {
switch (node.kind) {
case SyntaxKind.SourceFile:
case SyntaxKind.ModuleBlock:
updateStrictModeStatementList((<SourceFile | ModuleBlock>node).statements);
return;
case SyntaxKind.Block:
if (isFunctionLike(node.parent)) {
updateStrictModeStatementList((<Block>node).statements);
}
return;
case SyntaxKind.ClassDeclaration:
case SyntaxKind.ClassExpression:
// All classes are automatically in strict mode in ES6.
inStrictMode = true;
return;
}
}
function updateStrictModeStatementList(statements: NodeArray<Statement>) {
for (let statement of statements) {
if (!isPrologueDirective(statement)) {
return;
}
if (isUseStrictPrologueDirective(<ExpressionStatement>statement)) {
inStrictMode = true;
return;
}
}
}
/// Should be called only on prologue directives (isPrologueDirective(node) should be true)
function isUseStrictPrologueDirective(node: ExpressionStatement): boolean {
let nodeText = getTextOfNodeFromSourceText(file.text, node.expression);
// Note: the node text must be exactly "use strict" or 'use strict'. It is not ok for the
// string to contain unicode escapes (as per ES5).
return nodeText === '"use strict"' || nodeText === "'use strict'";
}
function bindWorker(node: Node) {
switch (node.kind) {
case SyntaxKind.Identifier:
return checkStrictModeIdentifier(<Identifier>node);
case SyntaxKind.BinaryExpression:
return checkStrictModeBinaryExpression(<BinaryExpression>node);
case SyntaxKind.CatchClause:
return checkStrictModeCatchClause(<CatchClause>node);
case SyntaxKind.DeleteExpression:
return checkStrictModeDeleteExpression(<DeleteExpression>node);
case SyntaxKind.NumericLiteral:
return checkStrictModeNumericLiteral(<LiteralExpression>node);
case SyntaxKind.PostfixUnaryExpression:
return checkStrictModePostfixUnaryExpression(<PostfixUnaryExpression>node);
case SyntaxKind.PrefixUnaryExpression:
return checkStrictModePrefixUnaryExpression(<PrefixUnaryExpression>node);
case SyntaxKind.WithStatement:
return checkStrictModeWithStatement(<WithStatement>node);
case SyntaxKind.TypeParameter:
return declareSymbolAndAddToSymbolTable(<Declaration>node, SymbolFlags.TypeParameter, SymbolFlags.TypeParameterExcludes);
case SyntaxKind.Parameter:
return bindParameter(<ParameterDeclaration>node);
case SyntaxKind.VariableDeclaration:
case SyntaxKind.BindingElement:
return bindVariableDeclarationOrBindingElement(<VariableDeclaration | BindingElement>node);
case SyntaxKind.PropertyDeclaration:
case SyntaxKind.PropertySignature:
return bindPropertyOrMethodOrAccessor(<Declaration>node, SymbolFlags.Property | ((<PropertyDeclaration>node).questionToken ? SymbolFlags.Optional : SymbolFlags.None), SymbolFlags.PropertyExcludes);
case SyntaxKind.PropertyAssignment:
case SyntaxKind.ShorthandPropertyAssignment:
return bindPropertyOrMethodOrAccessor(<Declaration>node, SymbolFlags.Property, SymbolFlags.PropertyExcludes);
case SyntaxKind.EnumMember:
return bindPropertyOrMethodOrAccessor(<Declaration>node, SymbolFlags.EnumMember, SymbolFlags.EnumMemberExcludes);
case SyntaxKind.CallSignature:
case SyntaxKind.ConstructSignature:
case SyntaxKind.IndexSignature:
return declareSymbolAndAddToSymbolTable(<Declaration>node, SymbolFlags.Signature, SymbolFlags.None);
case SyntaxKind.MethodDeclaration:
case SyntaxKind.MethodSignature:
// If this is an ObjectLiteralExpression method, then it sits in the same space
// as other properties in the object literal. So we use SymbolFlags.PropertyExcludes
// so that it will conflict with any other object literal members with the same
// name.
return bindPropertyOrMethodOrAccessor(<Declaration>node, SymbolFlags.Method | ((<MethodDeclaration>node).questionToken ? SymbolFlags.Optional : SymbolFlags.None),
isObjectLiteralMethod(node) ? SymbolFlags.PropertyExcludes : SymbolFlags.MethodExcludes);
case SyntaxKind.FunctionDeclaration:
checkStrictModeFunctionName(<FunctionDeclaration>node);
return declareSymbolAndAddToSymbolTable(<Declaration>node, SymbolFlags.Function, SymbolFlags.FunctionExcludes);
case SyntaxKind.Constructor:
return declareSymbolAndAddToSymbolTable(<Declaration>node, SymbolFlags.Constructor, /*symbolExcludes:*/ SymbolFlags.None);
case SyntaxKind.GetAccessor:
return bindPropertyOrMethodOrAccessor(<Declaration>node, SymbolFlags.GetAccessor, SymbolFlags.GetAccessorExcludes);
case SyntaxKind.SetAccessor:
return bindPropertyOrMethodOrAccessor(<Declaration>node, SymbolFlags.SetAccessor, SymbolFlags.SetAccessorExcludes);
case SyntaxKind.FunctionType:
case SyntaxKind.ConstructorType:
return bindFunctionOrConstructorType(<SignatureDeclaration>node);
case SyntaxKind.TypeLiteral:
return bindAnonymousDeclaration(<TypeLiteralNode>node, SymbolFlags.TypeLiteral, "__type");
case SyntaxKind.ObjectLiteralExpression:
return bindObjectLiteralExpression(<ObjectLiteralExpression>node);
case SyntaxKind.FunctionExpression:
case SyntaxKind.ArrowFunction:
checkStrictModeFunctionName(<FunctionExpression>node);
let bindingName = (<FunctionExpression>node).name ? (<FunctionExpression>node).name.text : "__function";
return bindAnonymousDeclaration(<FunctionExpression>node, SymbolFlags.Function, bindingName);
case SyntaxKind.ClassExpression:
case SyntaxKind.ClassDeclaration:
return bindClassLikeDeclaration(<ClassLikeDeclaration>node);
case SyntaxKind.InterfaceDeclaration:
return bindBlockScopedDeclaration(<Declaration>node, SymbolFlags.Interface, SymbolFlags.InterfaceExcludes);
case SyntaxKind.TypeAliasDeclaration:
return bindBlockScopedDeclaration(<Declaration>node, SymbolFlags.TypeAlias, SymbolFlags.TypeAliasExcludes);
case SyntaxKind.EnumDeclaration:
return bindEnumDeclaration(<EnumDeclaration>node);
case SyntaxKind.ModuleDeclaration:
return bindModuleDeclaration(<ModuleDeclaration>node);
case SyntaxKind.ImportEqualsDeclaration:
case SyntaxKind.NamespaceImport:
case SyntaxKind.ImportSpecifier:
case SyntaxKind.ExportSpecifier:
return declareSymbolAndAddToSymbolTable(<Declaration>node, SymbolFlags.Alias, SymbolFlags.AliasExcludes);
case SyntaxKind.ImportClause:
return bindImportClause(<ImportClause>node);
case SyntaxKind.ExportDeclaration:
return bindExportDeclaration(<ExportDeclaration>node);
case SyntaxKind.ExportAssignment:
return bindExportAssignment(<ExportAssignment>node);
case SyntaxKind.SourceFile:
return bindSourceFileIfExternalModule();
}
}
function bindSourceFileIfExternalModule() {
setExportContextFlag(file);
if (isExternalModule(file)) {
bindAnonymousDeclaration(file, SymbolFlags.ValueModule, '"' + removeFileExtension(file.fileName) + '"');
}
}
function bindExportAssignment(node: ExportAssignment) {
if (!container.symbol || !container.symbol.exports) {
// Export assignment in some sort of block construct
bindAnonymousDeclaration(node, SymbolFlags.Alias, getDeclarationName(node));
}
else if (node.expression.kind === SyntaxKind.Identifier) {
// An export default clause with an identifier exports all meanings of that identifier
declareSymbol(container.symbol.exports, container.symbol, node, SymbolFlags.Alias, SymbolFlags.PropertyExcludes | SymbolFlags.AliasExcludes);
}
else {
// An export default clause with an expression exports a value
declareSymbol(container.symbol.exports, container.symbol, node, SymbolFlags.Property, SymbolFlags.PropertyExcludes | SymbolFlags.AliasExcludes);
}
}
function bindExportDeclaration(node: ExportDeclaration) {
if (!container.symbol || !container.symbol.exports) {
// Export * in some sort of block construct
bindAnonymousDeclaration(node, SymbolFlags.ExportStar, getDeclarationName(node));
}
else if (!node.exportClause) {
// All export * declarations are collected in an __export symbol
declareSymbol(container.symbol.exports, container.symbol, node, SymbolFlags.ExportStar, SymbolFlags.None);
}
}
function bindImportClause(node: ImportClause) {
if (node.name) {
declareSymbolAndAddToSymbolTable(node, SymbolFlags.Alias, SymbolFlags.AliasExcludes);
}
}
function bindClassLikeDeclaration(node: ClassLikeDeclaration) {
if (node.kind === SyntaxKind.ClassDeclaration) {
bindBlockScopedDeclaration(node, SymbolFlags.Class, SymbolFlags.ClassExcludes);
}
else {
let bindingName = node.name ? node.name.text : "__class";
bindAnonymousDeclaration(node, SymbolFlags.Class, bindingName);
}
let symbol = node.symbol;
// TypeScript 1.0 spec (April 2014): 8.4
// Every class automatically contains a static property member named 'prototype', the
// type of which is an instantiation of the class type with type Any supplied as a type
// argument for each type parameter. It is an error to explicitly declare a static
// property member with the name 'prototype'.
//
// Note: we check for this here because this class may be merging into a module. The
// module might have an exported variable called 'prototype'. We can't allow that as
// that would clash with the built-in 'prototype' for the class.
let prototypeSymbol = createSymbol(SymbolFlags.Property | SymbolFlags.Prototype, "prototype");
if (hasProperty(symbol.exports, prototypeSymbol.name)) {
if (node.name) {
node.name.parent = node;
}
file.bindDiagnostics.push(createDiagnosticForNode(symbol.exports[prototypeSymbol.name].declarations[0],
Diagnostics.Duplicate_identifier_0, prototypeSymbol.name));
}
symbol.exports[prototypeSymbol.name] = prototypeSymbol;
prototypeSymbol.parent = symbol;
}
function bindEnumDeclaration(node: EnumDeclaration) {
return isConst(node)
? bindBlockScopedDeclaration(node, SymbolFlags.ConstEnum, SymbolFlags.ConstEnumExcludes)
: bindBlockScopedDeclaration(node, SymbolFlags.RegularEnum, SymbolFlags.RegularEnumExcludes);
}