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/**
* @fileoverview Abstract syntax tree representing a source file once parsed.
*
* Each node in the AST is represented by an instance of a subclass of `Node`,
* with its `Node#kind` represented by one of the `NodeKind` constants, which
* dependent code typically switches over. The intended way to create a node
* is to use the respective `Node.createX` method instead of its constructor.
*
* Note that the AST does not contain any type information except type names.
*
* @license Apache-2.0
*/
// TODO: Make the AST more easily serializable by refactoring `Node#range` so
// it doesn't reference the non-serializable `Source` object.
import {
CommonFlags,
PATH_DELIMITER,
LIBRARY_PREFIX,
LIBRARY_SUBST
} from "./common";
import {
Range
} from "./diagnostics";
import {
Token
} from "./tokenizer";
import {
normalizePath,
resolvePath,
CharCode
} from "./util";
import {
ExpressionRef
} from "./module";
import {
Type
} from "./types";
/** Indicates the kind of a node. */
export const enum NodeKind {
Source,
// types
NamedType,
FunctionType,
TypeName,
TypeParameter,
Parameter,
// expressions
Identifier,
Assertion,
Binary,
Call,
Class,
Comma,
ElementAccess,
False,
Function,
InstanceOf,
Literal,
New,
Null,
Omitted,
Parenthesized,
PropertyAccess,
Ternary,
Super,
This,
True,
Constructor,
UnaryPostfix,
UnaryPrefix,
Compiled,
// statements
Block,
Break,
Continue,
Do,
Empty,
Export,
ExportDefault,
ExportImport,
Expression,
For,
ForOf,
If,
Import,
Return,
Switch,
Throw,
Try,
Variable,
Void,
While,
Module,
// declaration statements
ClassDeclaration,
EnumDeclaration,
EnumValueDeclaration,
FieldDeclaration,
FunctionDeclaration,
ImportDeclaration,
InterfaceDeclaration,
MethodDeclaration,
NamespaceDeclaration,
TypeDeclaration,
VariableDeclaration,
// special
Decorator,
ExportMember,
SwitchCase,
IndexSignature,
Comment
}
/** Base class of all nodes. */
export abstract class Node {
constructor(
/** Kind of this node. */
public kind: NodeKind,
/** Source range. */
public range: Range
) {}
// types
static createSimpleTypeName(
name: string,
range: Range
): TypeName {
return new TypeName(Node.createIdentifierExpression(name, range), null, range);
}
static createNamedType(
name: TypeName,
typeArguments: TypeNode[] | null,
isNullable: bool,
range: Range
): NamedTypeNode {
return new NamedTypeNode(name, typeArguments, isNullable, range);
}
static createFunctionType(
parameters: ParameterNode[],
returnType: TypeNode,
explicitThisType: NamedTypeNode | null,
isNullable: bool,
range: Range
): FunctionTypeNode {
return new FunctionTypeNode(parameters, returnType, explicitThisType, isNullable, range);
}
static createOmittedType(
range: Range
): NamedTypeNode {
return new NamedTypeNode(Node.createSimpleTypeName("", range), null, false, range);
}
static createTypeParameter(
name: IdentifierExpression,
extendsType: NamedTypeNode | null,
defaultType: NamedTypeNode | null,
range: Range
): TypeParameterNode {
return new TypeParameterNode(name, extendsType, defaultType, range);
}
static createParameter(
parameterKind: ParameterKind,
name: IdentifierExpression,
type: TypeNode,
initializer: Expression | null,
range: Range
): ParameterNode {
return new ParameterNode(parameterKind, name, type, initializer, range);
}
// special
static createDecorator(
name: Expression,
args: Expression[] | null,
range: Range
): DecoratorNode {
return new DecoratorNode(DecoratorKind.fromNode(name), name, args, range);
}
static createComment(
commentKind: CommentKind,
text: string,
range: Range
): CommentNode {
return new CommentNode(commentKind, text, range);
}
// expressions
static createIdentifierExpression(
text: string,
range: Range,
isQuoted: bool = false
): IdentifierExpression {
return new IdentifierExpression(text, isQuoted, range);
}
static createEmptyIdentifierExpression(
range: Range
): IdentifierExpression {
return new IdentifierExpression("", false, range);
}
static createArrayLiteralExpression(
elementExpressions: Expression[],
range: Range
): ArrayLiteralExpression {
return new ArrayLiteralExpression(elementExpressions, range);
}
static createAssertionExpression(
assertionKind: AssertionKind,
expression: Expression,
toType: TypeNode | null,
range: Range
): AssertionExpression {
return new AssertionExpression(assertionKind, expression, toType, range);
}
static createBinaryExpression(
operator: Token,
left: Expression,
right: Expression,
range: Range
): BinaryExpression {
return new BinaryExpression(operator, left, right, range);
}
static createCallExpression(
expression: Expression,
typeArguments: TypeNode[] | null,
args: Expression[],
range: Range
): CallExpression {
return new CallExpression(expression, typeArguments, args, range);
}
static createClassExpression(
declaration: ClassDeclaration
): ClassExpression {
return new ClassExpression(declaration);
}
static createCommaExpression(
expressions: Expression[],
range: Range
): CommaExpression {
return new CommaExpression(expressions, range);
}
static createConstructorExpression(
range: Range
): ConstructorExpression {
return new ConstructorExpression(range);
}
static createElementAccessExpression(
expression: Expression,
elementExpression: Expression,
range: Range
): ElementAccessExpression {
return new ElementAccessExpression(expression, elementExpression, range);
}
static createFalseExpression(
range: Range
): FalseExpression {
return new FalseExpression(range);
}
static createFloatLiteralExpression(
value: f64,
range: Range
): FloatLiteralExpression {
return new FloatLiteralExpression(value, range);
}
static createFunctionExpression(
declaration: FunctionDeclaration
): FunctionExpression {
return new FunctionExpression(declaration);
}
static createInstanceOfExpression(
expression: Expression,
isType: TypeNode,
range: Range
): InstanceOfExpression {
return new InstanceOfExpression(expression, isType, range);
}
static createIntegerLiteralExpression(
value: i64,
range: Range
): IntegerLiteralExpression {
return new IntegerLiteralExpression(value, range);
}
static createNewExpression(
typeName: TypeName,
typeArguments: TypeNode[] | null,
args: Expression[],
range: Range
): NewExpression {
return new NewExpression(typeName, typeArguments, args, range);
}
static createNullExpression(
range: Range
): NullExpression {
return new NullExpression(range);
}
static createObjectLiteralExpression(
names: IdentifierExpression[],
values: Expression[],
range: Range
): ObjectLiteralExpression {
return new ObjectLiteralExpression(names, values, range);
}
static createOmittedExpression(
range: Range
): OmittedExpression {
return new OmittedExpression(range);
}
static createParenthesizedExpression(
expression: Expression,
range: Range
): ParenthesizedExpression {
return new ParenthesizedExpression(expression, range);
}
static createPropertyAccessExpression(
expression: Expression,
property: IdentifierExpression,
range: Range
): PropertyAccessExpression {
return new PropertyAccessExpression(expression, property, range);
}
static createRegexpLiteralExpression(
pattern: string,
patternFlags: string,
range: Range
): RegexpLiteralExpression {
return new RegexpLiteralExpression(pattern, patternFlags, range);
}
static createTernaryExpression(
condition: Expression,
ifThen: Expression,
ifElse: Expression,
range: Range
): TernaryExpression {
return new TernaryExpression(condition, ifThen, ifElse, range);
}
static createStringLiteralExpression(
value: string,
range: Range
): StringLiteralExpression {
return new StringLiteralExpression(value, range);
}
static createSuperExpression(
range: Range
): SuperExpression {
return new SuperExpression(range);
}
static createTemplateLiteralExpression(
tag: Expression | null,
parts: string[],
rawParts: string[],
expressions: Expression[],
range: Range
): TemplateLiteralExpression {
return new TemplateLiteralExpression(tag, parts, rawParts, expressions, range);
}
static createThisExpression(
range: Range
): ThisExpression {
return new ThisExpression(range);
}
static createTrueExpression(
range: Range
): TrueExpression {
return new TrueExpression(range);
}
static createUnaryPostfixExpression(
operator: Token,
operand: Expression,
range: Range
): UnaryPostfixExpression {
return new UnaryPostfixExpression(operator, operand, range);
}
static createUnaryPrefixExpression(
operator: Token,
operand: Expression,
range: Range
): UnaryPrefixExpression {
return new UnaryPrefixExpression(operator, operand, range);
}
static createCompiledExpression(
expr: ExpressionRef,
type: Type,
range: Range
): Expression {
return new CompiledExpression(expr, type, range);
}
// statements
static createBlockStatement(
statements: Statement[],
range: Range
): BlockStatement {
return new BlockStatement(statements, range);
}
static createBreakStatement(
label: IdentifierExpression | null,
range: Range
): BreakStatement {
return new BreakStatement(label, range);
}
static createClassDeclaration(
name: IdentifierExpression,
decorators: DecoratorNode[] | null,
flags: CommonFlags,
typeParameters: TypeParameterNode[] | null,
extendsType: NamedTypeNode | null,
implementsTypes: NamedTypeNode[] | null,
members: DeclarationStatement[],
range: Range
): ClassDeclaration {
return new ClassDeclaration(name, decorators, flags, typeParameters, extendsType, implementsTypes, members, range);
}
static createContinueStatement(
label: IdentifierExpression | null,
range: Range
): ContinueStatement {
return new ContinueStatement(label, range);
}
static createDoStatement(
body: Statement,
condition: Expression,
range: Range
): DoStatement {
return new DoStatement(body, condition, range);
}
static createEmptyStatement(
range: Range
): EmptyStatement {
return new EmptyStatement(range);
}
static createEnumDeclaration(
name: IdentifierExpression,
decorators: DecoratorNode[] | null,
flags: CommonFlags,
values: EnumValueDeclaration[],
range: Range
): EnumDeclaration {
return new EnumDeclaration(name, decorators, flags, values, range);
}
static createEnumValueDeclaration(
name: IdentifierExpression,
flags: CommonFlags,
initializer: Expression | null,
range: Range
): EnumValueDeclaration {
return new EnumValueDeclaration(name, flags, initializer, range);
}
static createExportStatement(
members: ExportMember[] | null,
path: StringLiteralExpression | null,
isDeclare: bool,
range: Range
): ExportStatement {
return new ExportStatement(members, path, isDeclare, range);
}
static createExportDefaultStatement(
declaration: DeclarationStatement,
range: Range
): ExportDefaultStatement {
return new ExportDefaultStatement(declaration, range);
}
static createExportImportStatement(
name: IdentifierExpression,
externalName: IdentifierExpression,
range: Range
): ExportImportStatement {
return new ExportImportStatement(name, externalName, range);
}
static createExportMember(
localName: IdentifierExpression,
exportedName: IdentifierExpression | null,
range: Range
): ExportMember {
if (!exportedName) exportedName = localName;
return new ExportMember(localName, exportedName, range);
}
static createExpressionStatement(
expression: Expression
): ExpressionStatement {
return new ExpressionStatement(expression);
}
static createIfStatement(
condition: Expression,
ifTrue: Statement,
ifFalse: Statement | null,
range: Range
): IfStatement {
return new IfStatement(condition, ifTrue, ifFalse, range);
}
static createImportStatement(
declarations: ImportDeclaration[] | null,
path: StringLiteralExpression,
range: Range
): ImportStatement {
return new ImportStatement(declarations, null, path, range);
}
static createWildcardImportStatement(
namespaceName: IdentifierExpression,
path: StringLiteralExpression,
range: Range
): ImportStatement {
return new ImportStatement(null, namespaceName, path, range);
}
static createImportDeclaration(
foreignName: IdentifierExpression,
name: IdentifierExpression | null,
range: Range
): ImportDeclaration {
if (!name) name = foreignName;
return new ImportDeclaration(name, foreignName, range);
}
static createInterfaceDeclaration(
name: IdentifierExpression,
decorators: DecoratorNode[] | null,
flags: CommonFlags,
typeParameters: TypeParameterNode[] | null,
extendsType: NamedTypeNode | null,
implementsTypes: NamedTypeNode[] | null,
members: DeclarationStatement[],
range: Range
): InterfaceDeclaration {
return new InterfaceDeclaration(name, decorators, flags, typeParameters, extendsType, implementsTypes, members, range);
}
static createFieldDeclaration(
name: IdentifierExpression,
decorators: DecoratorNode[] | null,
flags: CommonFlags,
type: TypeNode | null,
initializer: Expression | null,
range: Range
): FieldDeclaration {
return new FieldDeclaration(name, decorators, flags, type, initializer, -1, range);
}
static createForStatement(
initializer: Statement | null,
condition: Expression | null,
incrementor: Expression | null,
body: Statement,
range: Range
): ForStatement {
return new ForStatement(initializer, condition, incrementor, body, range);
}
static createForOfStatement(
variable: Statement,
iterable: Expression,
body: Statement,
range: Range
): ForOfStatement {
return new ForOfStatement(variable, iterable, body, range);
}
static createFunctionDeclaration(
name: IdentifierExpression,
decorators: DecoratorNode[] | null,
flags: CommonFlags,
typeParameters: TypeParameterNode[] | null,
signature: FunctionTypeNode,
body: Statement | null,
arrowKind: ArrowKind,
range: Range
): FunctionDeclaration {
return new FunctionDeclaration(name, decorators, flags, typeParameters, signature, body, arrowKind, range);
}
static createIndexSignature(
keyType: NamedTypeNode,
valueType: TypeNode,
flags: CommonFlags,
range: Range
): IndexSignatureNode {
return new IndexSignatureNode(keyType, valueType, flags, range);
}
static createMethodDeclaration(
name: IdentifierExpression,
decorators: DecoratorNode[] | null,
flags: CommonFlags,
typeParameters: TypeParameterNode[] | null,
signature: FunctionTypeNode,
body: Statement | null,
range: Range
): MethodDeclaration {
return new MethodDeclaration(name, decorators, flags, typeParameters, signature, body, range);
}
static createNamespaceDeclaration(
name: IdentifierExpression,
decorators: DecoratorNode[] | null,
flags: CommonFlags,
members: Statement[],
range: Range
): NamespaceDeclaration {
return new NamespaceDeclaration(name, decorators, flags, members, range);
}
static createReturnStatement(
value: Expression | null,
range: Range
): ReturnStatement {
return new ReturnStatement(value, range);
}
static createSwitchStatement(
condition: Expression,
cases: SwitchCase[],
range: Range
): SwitchStatement {
return new SwitchStatement(condition, cases, range);
}
static createSwitchCase(
label: Expression | null,
statements: Statement[],
range: Range
): SwitchCase {
return new SwitchCase(label, statements, range);
}
static createThrowStatement(
value: Expression,
range: Range
): ThrowStatement {
return new ThrowStatement(value, range);
}
static createTryStatement(
bodyStatements: Statement[],
catchVariable: IdentifierExpression | null,
catchStatements: Statement[] | null,
finallyStatements: Statement[] | null,
range: Range
): TryStatement {
return new TryStatement(bodyStatements, catchVariable, catchStatements, finallyStatements, range);
}
static createTypeDeclaration(
name: IdentifierExpression,
decorators: DecoratorNode[] | null,
flags: CommonFlags,
typeParameters: TypeParameterNode[] | null,
type: TypeNode,
range: Range
): TypeDeclaration {
return new TypeDeclaration(name, decorators, flags, typeParameters, type, range);
}
static createModuleDeclaration(
name: string,
flags: CommonFlags,
range: Range
): ModuleDeclaration {
return new ModuleDeclaration(name, flags, range);
}
static createVariableStatement(
decorators: DecoratorNode[] | null,
declarations: VariableDeclaration[],
range: Range
): VariableStatement {
return new VariableStatement(decorators, declarations, range);
}
static createVariableDeclaration(
name: IdentifierExpression,
decorators: DecoratorNode[] | null,
flags: CommonFlags,
type: TypeNode | null,
initializer: Expression | null,
range: Range
): VariableDeclaration {
return new VariableDeclaration(name, decorators, flags, type, initializer, range);
}
static createVoidStatement(
expression: Expression,
range: Range
): VoidStatement {
return new VoidStatement(expression, range);
}
static createWhileStatement(
condition: Expression,
statement: Statement,
range: Range
): WhileStatement {
return new WhileStatement(condition, statement, range);
}
/** Tests if this node is a literal of the specified kind. */
isLiteralKind(literalKind: LiteralKind): bool {
return this.kind == NodeKind.Literal
&& (<LiteralExpression>changetype<Node>(this)).literalKind == literalKind; // TS
}
/** Tests if this node is a literal of a numeric kind (float or integer). */
get isNumericLiteral(): bool {
if (this.kind == NodeKind.Literal) {
switch ((<LiteralExpression>changetype<Node>(this)).literalKind) { // TS
case LiteralKind.Float:
case LiteralKind.Integer: return true;
}
}
return false;
}
/** Tests whether this node is guaranteed to compile to a constant value. */
get compilesToConst(): bool {
switch (this.kind) {
case NodeKind.Literal: {
switch ((<LiteralExpression>changetype<Node>(this)).literalKind) { // TS
case LiteralKind.Float:
case LiteralKind.Integer:
case LiteralKind.String: return true;
}
break;
}
case NodeKind.Null:
case NodeKind.True:
case NodeKind.False: return true;
}
return false;
}
private isAccessOn(kind: NodeKind): bool {
let node = changetype<Node>(this);
if (node.kind == NodeKind.Call) {
node = (<CallExpression>node).expression;
}
if (node.kind == NodeKind.PropertyAccess) {
let target = (<PropertyAccessExpression>node).expression;
if (target.kind == kind) return true;
}
return false;
}
/** Checks if this node accesses a method or property on `this`. */
get isAccessOnThis(): bool {
return this.isAccessOn(NodeKind.This);
}
/** Checks if this node accesses a method or property on `super`. */
get isAccessOnSuper(): bool {
return this.isAccessOn(NodeKind.Super);
}
get isEmpty(): bool {
return this.kind == NodeKind.Empty;
}
}
// types
export abstract class TypeNode extends Node {
constructor(
/** Kind of the type node. */
kind: NodeKind,
/** Whether nullable or not. */
public isNullable: bool,
/** Source range. */
range: Range
) {
super(kind, range);
}
/** Whether this type node is currently in the process of being resolved. */
currentlyResolving: bool = false;
/** Tests if this type has a generic component matching one of the given type parameters. */
hasGenericComponent(typeParameterNodes: TypeParameterNode[]): bool {
if (this.kind == NodeKind.NamedType) {
let namedTypeNode = <NamedTypeNode>changetype<TypeNode>(this); // TS
if (!namedTypeNode.name.next) {
let typeArgumentNodes = namedTypeNode.typeArguments;
if (typeArgumentNodes && typeArgumentNodes.length > 0) {
for (let i = 0, k = typeArgumentNodes.length; i < k; ++i) {
if (typeArgumentNodes[i].hasGenericComponent(typeParameterNodes)) return true;
}
} else {
let name = namedTypeNode.name.identifier.text;
for (let i = 0, k = typeParameterNodes.length; i < k; ++i) {
if (typeParameterNodes[i].name.text == name) return true;
}
}
}
} else if (this.kind == NodeKind.FunctionType) {
let functionTypeNode = <FunctionTypeNode>changetype<TypeNode>(this); // TS
let parameterNodes = functionTypeNode.parameters;
for (let i = 0, k = parameterNodes.length; i < k; ++i) {
if (parameterNodes[i].type.hasGenericComponent(typeParameterNodes)) return true;
}
if (functionTypeNode.returnType.hasGenericComponent(typeParameterNodes)) return true;
let explicitThisType = functionTypeNode.explicitThisType;
if (explicitThisType && explicitThisType.hasGenericComponent(typeParameterNodes)) return true;
} else {
assert(false);
}
return false;
}
}
/** Represents a type name. */
export class TypeName extends Node {
constructor(
/** Identifier of this part. */
public identifier: IdentifierExpression,
/** Next part of the type name or `null` if this is the last part. */
public next: TypeName | null,
/** Source range. */
range: Range
) {
super(NodeKind.TypeName, range);
}
}
/** Represents a named type. */
export class NamedTypeNode extends TypeNode {
constructor(
/** Type name. */
public name: TypeName,
/** Type argument references. */
public typeArguments: TypeNode[] | null,
/** Whether nullable or not. */
isNullable: bool,
/** Source range. */
range: Range
) {
super(NodeKind.NamedType, isNullable, range);
}
/** Checks if this type node has type arguments. */
get hasTypeArguments(): bool {
let typeArguments = this.typeArguments;
return typeArguments != null && typeArguments.length > 0;
}
/** Tests if this type is "null". */
get isNull(): bool {
return this.name.identifier.text == "null";
}
}
/** Represents a function type. */
export class FunctionTypeNode extends TypeNode {
constructor(
/** Function parameters. */
public parameters: ParameterNode[],
/** Return type. */
public returnType: TypeNode,
/** Explicitly provided this type, if any. */
public explicitThisType: NamedTypeNode | null, // can't be a function
/** Whether nullable or not. */
isNullable: bool,
/** Source range. */
range: Range
) {
super(NodeKind.FunctionType, isNullable, range);
}
}
/** Represents a type parameter. */
export class TypeParameterNode extends Node {
constructor(
/** Identifier reference. */
public name: IdentifierExpression,
/** Extended type reference, if any. */
public extendsType: NamedTypeNode | null, // can't be a function
/** Default type if omitted, if any. */
public defaultType: NamedTypeNode | null, // can't be a function
/** Source range. */
range: Range
) {
super(NodeKind.TypeParameter, range);
}
}
/** Represents the kind of a parameter. */
export const enum ParameterKind {
/** No specific flags. */
Default,
/** Is an optional parameter. */
Optional,
/** Is a rest parameter. */
Rest
}
/** Represents a function parameter. */
export class ParameterNode extends Node {
constructor(
/** Parameter kind. */
public parameterKind: ParameterKind,
/** Parameter name. */
public name: IdentifierExpression,
/** Parameter type. */
public type: TypeNode,
/** Initializer expression, if any. */
public initializer: Expression | null,
/** Source range. */
range: Range
) {
super(NodeKind.Parameter, range);
}
/** Implicit field declaration, if applicable. */
implicitFieldDeclaration: FieldDeclaration | null = null;
/** Common flags indicating specific traits. */
flags: CommonFlags = CommonFlags.None;
/** Tests if this node has the specified flag or flags. */
is(flag: CommonFlags): bool { return (this.flags & flag) == flag; }
/** Tests if this node has one of the specified flags. */
isAny(flag: CommonFlags): bool { return (this.flags & flag) != 0; }
/** Sets a specific flag or flags. */
set(flag: CommonFlags): void { this.flags |= flag; }
}
// special
/** Built-in decorator kinds. */
export enum DecoratorKind {
Custom,
Global,
Operator,
OperatorBinary,
OperatorPrefix,
OperatorPostfix,
Unmanaged,
Final,
Inline,