/**

* Abstract Syntax Tree extras.

*

* Not needed in a standalone compiler but useful for testing the parser.

*

* @module extra/ast

*//***/

import {

Node,

NodeKind,

Source,

ArrowKind,

TypeNode,

NamedTypeNode,

FunctionTypeNode,

TypeName,

TypeParameterNode,

Expression,

IdentifierExpression,

LiteralExpression,

LiteralKind,

FloatLiteralExpression,

IntegerLiteralExpression,

StringLiteralExpression,

RegexpLiteralExpression,

ArrayLiteralExpression,

AssertionExpression,

AssertionKind,

BinaryExpression,

CallExpression,

CommaExpression,

ElementAccessExpression,

FunctionExpression,

NewExpression,

ParenthesizedExpression,

PropertyAccessExpression,

TernaryExpression,

UnaryPostfixExpression,

UnaryExpression,

UnaryPrefixExpression,

ClassExpression,

ObjectLiteralExpression,

Statement,

BlockStatement,

BreakStatement,

ContinueStatement,

DoStatement,

EmptyStatement,

ExportImportStatement,

ExportStatement,

ExportDefaultStatement,

ExpressionStatement,

ForStatement,

IfStatement,

ImportStatement,

InstanceOfExpression,

ReturnStatement,

SwitchStatement,

ThrowStatement,

TryStatement,

VariableStatement,

WhileStatement,

ClassDeclaration,

EnumDeclaration,

EnumValueDeclaration,

FieldDeclaration,

FunctionDeclaration,

ImportDeclaration,

IndexSignatureDeclaration,

InterfaceDeclaration,

MethodDeclaration,

NamespaceDeclaration,

TypeDeclaration,

VariableDeclaration,

DecoratorNode,

ParameterNode,

ParameterKind,

ExportMember,

SwitchCase,

DeclarationStatement,

isTypeOmitted

} from "../ast";

import {

operatorTokenToString

} from "../tokenizer";

import {

CharCode,

indent

} from "../util";

import {

CommonFlags

} from "../common";

/** An AST builder. */

export class ASTBuilder {

/** Rebuilds the textual source from the specified AST, as far as possible. */

static build(node: Node): string {

var builder = new ASTBuilder();

builder.visitNode(node);

return builder.finish();

}

private sb: string[] = [];

private indentLevel: i32 = 0;

visitNode(node: Node): void {

switch (node.kind) {

case NodeKind.SOURCE: {

this.visitSource(<Source>node);

break;

}

// types

case NodeKind.NAMEDTYPE: {

this.visitNamedTypeNode(<NamedTypeNode>node);

break;

}

case NodeKind.FUNCTIONTYPE: {

this.visitFunctionTypeNode(<FunctionTypeNode>node);

break;

}

case NodeKind.TYPEPARAMETER: {

this.visitTypeParameter(<TypeParameterNode>node);

break;

}

// expressions

case NodeKind.FALSE:

case NodeKind.NULL:

case NodeKind.SUPER:

case NodeKind.THIS:

case NodeKind.TRUE:

case NodeKind.CONSTRUCTOR:

case NodeKind.IDENTIFIER: {

this.visitIdentifierExpression(<IdentifierExpression>node);

break;

}

case NodeKind.ASSERTION: {

this.visitAssertionExpression(<AssertionExpression>node);

break;

}

case NodeKind.BINARY: {

this.visitBinaryExpression(<BinaryExpression>node);

break;

}

case NodeKind.CALL: {

this.visitCallExpression(<CallExpression>node);

break;

}

case NodeKind.CLASS: {

this.visitClassExpression(<ClassExpression>node);

break;

}

case NodeKind.COMMA: {

this.visitCommaExpression(<CommaExpression>node);

break;

}

case NodeKind.ELEMENTACCESS: {

this.visitElementAccessExpression(<ElementAccessExpression>node);

break;

}

case NodeKind.FUNCTION: {

this.visitFunctionExpression(<FunctionExpression>node);

break;

}

case NodeKind.INSTANCEOF: {

this.visitInstanceOfExpression(<InstanceOfExpression>node);

break;

}

case NodeKind.LITERAL: {

this.visitLiteralExpression(<LiteralExpression>node);

break;

}

case NodeKind.NEW: {

this.visitNewExpression(<NewExpression>node);

break;

}

case NodeKind.PARENTHESIZED: {

this.visitParenthesizedExpression(<ParenthesizedExpression>node);

break;

}

case NodeKind.PROPERTYACCESS: {

this.visitPropertyAccessExpression(<PropertyAccessExpression>node);

break;

}

case NodeKind.TERNARY: {

this.visitTernaryExpression(<TernaryExpression>node);

break;

}

case NodeKind.UNARYPOSTFIX: {

this.visitUnaryPostfixExpression(<UnaryPostfixExpression>node);

break;

}

case NodeKind.UNARYPREFIX: {

this.visitUnaryPrefixExpression(<UnaryPrefixExpression>node);

break;

}

// statements

case NodeKind.BLOCK: {

this.visitBlockStatement(<BlockStatement>node);

break;

}

case NodeKind.BREAK: {

this.visitBreakStatement(<BreakStatement>node);

break;

}

case NodeKind.CONTINUE: {

this.visitContinueStatement(<ContinueStatement>node);

break;

}

case NodeKind.DO: {

this.visitDoStatement(<DoStatement>node);

break;

}

case NodeKind.EMPTY: {

this.visitEmptyStatement(<EmptyStatement>node);

break;

}

case NodeKind.EXPORT: {

this.visitExportStatement(<ExportStatement>node);

break;

}

case NodeKind.EXPORTDEFAULT: {

this.visitExportDefaultStatement(<ExportDefaultStatement>node);

break;

}

case NodeKind.EXPORTIMPORT: {

this.visitExportImportStatement(<ExportImportStatement>node);

break;

}

case NodeKind.EXPRESSION: {

this.visitExpressionStatement(<ExpressionStatement>node);

break;

}

case NodeKind.FOR: {

this.visitForStatement(<ForStatement>node);

break;

}

case NodeKind.IF: {

this.visitIfStatement(<IfStatement>node);

break;

}

case NodeKind.IMPORT: {

this.visitImportStatement(<ImportStatement>node);

break;

}

case NodeKind.RETURN: {

this.visitReturnStatement(<ReturnStatement>node);

break;

}

case NodeKind.SWITCH: {

this.visitSwitchStatement(<SwitchStatement>node);

break;

}

case NodeKind.THROW: {

this.visitThrowStatement(<ThrowStatement>node);

break;

}

case NodeKind.TRY: {

this.visitTryStatement(<TryStatement>node);

break;

}

case NodeKind.VARIABLE: {

this.visitVariableStatement(<VariableStatement>node);

break;

}

case NodeKind.WHILE: {

this.visitWhileStatement(<WhileStatement>node);

break;

}

// declaration statements

case NodeKind.CLASSDECLARATION: {

this.visitClassDeclaration(<ClassDeclaration>node);

break;

}

case NodeKind.ENUMDECLARATION: {

this.visitEnumDeclaration(<EnumDeclaration>node);

break;

}

case NodeKind.ENUMVALUEDECLARATION: {

this.visitEnumValueDeclaration(<EnumValueDeclaration>node);

break;

}

case NodeKind.FIELDDECLARATION: {

this.visitFieldDeclaration(<FieldDeclaration>node);

break;

}

case NodeKind.FUNCTIONDECLARATION: {

this.visitFunctionDeclaration(<FunctionDeclaration>node);

break;

}

case NodeKind.IMPORTDECLARATION: {

this.visitImportDeclaration(<ImportDeclaration>node);

break;

}

case NodeKind.INDEXSIGNATUREDECLARATION: {

this.visitIndexSignatureDeclaration(<IndexSignatureDeclaration>node);

break;

}

case NodeKind.INTERFACEDECLARATION: {

this.visitInterfaceDeclaration(<InterfaceDeclaration>node);

break;

}

case NodeKind.METHODDECLARATION: {

this.visitMethodDeclaration(<MethodDeclaration>node);

break;

}

case NodeKind.NAMESPACEDECLARATION: {

this.visitNamespaceDeclaration(<NamespaceDeclaration>node);

break;

}

case NodeKind.TYPEDECLARATION: {

this.visitTypeDeclaration(<TypeDeclaration>node);

break;

}

case NodeKind.VARIABLEDECLARATION: {

this.visitVariableDeclaration(<VariableDeclaration>node);

break;

}

// other

case NodeKind.DECORATOR: {

this.serializeDecorator(<DecoratorNode>node);

break;

}

case NodeKind.EXPORTMEMBER: {

this.visitExportMember(<ExportMember>node);

break;

}

case NodeKind.PARAMETER: {

this.serializeParameter(<ParameterNode>node);

break;

}

case NodeKind.SWITCHCASE: {

this.visitSwitchCase(<SwitchCase>node);

break;

}

default: assert(false);

}

}

visitSource(source: Source): void {

var statements = source.statements;

for (let i = 0, k = statements.length; i < k; ++i) {

this.visitNodeAndTerminate(statements[i]);

}

}

// types

visitTypeNode(node: TypeNode): void {

switch (node.kind) {

case NodeKind.NAMEDTYPE: {

this.visitNamedTypeNode(<NamedTypeNode>node);

break;

}

case NodeKind.FUNCTIONTYPE: {

this.visitFunctionTypeNode(<FunctionTypeNode>node);

break;

}

default: assert(false);

}

}

visitTypeName(node: TypeName): void {

this.visitIdentifierExpression(node.identifier);

var sb = this.sb;

var current = node.next;

while (current) {

sb.push(".");

this.visitIdentifierExpression(current.identifier);

current = current.next;

}

}

visitNamedTypeNode(node: NamedTypeNode): void {

this.visitTypeName(node.name);

var typeArguments = node.typeArguments;

if (typeArguments) {

let numTypeArguments = typeArguments.length;

let sb = this.sb;

if (numTypeArguments) {

sb.push("<");

this.visitTypeNode(typeArguments[0]);

for (let i = 1; i < numTypeArguments; ++i) {

sb.push(", ");

this.visitTypeNode(typeArguments[i]);

}

sb.push(">");

}

if (node.isNullable) sb.push(" | null");

}

}

visitFunctionTypeNode(node: FunctionTypeNode): void {

var isNullable = node.isNullable;

var sb = this.sb;

sb.push(isNullable ? "((" : "(");

var explicitThisType = node.explicitThisType;

if (explicitThisType) {

sb.push("this: ");

this.visitTypeNode(explicitThisType);

}

var parameters = node.parameters;

var numParameters = parameters.length;

if (numParameters) {

if (explicitThisType) sb.push(", ");

this.serializeParameter(parameters[0]);

for (let i = 1; i < numParameters; ++i) {

sb.push(", ");

this.serializeParameter(parameters[i]);

}

}

var returnType = node.returnType;

if (returnType) {

sb.push(") => ");

this.visitTypeNode(returnType);

} else {

sb.push(") => void");

}

if (isNullable) sb.push(") | null");

}

visitTypeParameter(node: TypeParameterNode): void {

this.visitIdentifierExpression(node.name);

var extendsType = node.extendsType;

if (extendsType) {

this.sb.push(" extends ");

this.visitTypeNode(extendsType);

}

var defaultType = node.defaultType;

if (defaultType) {

this.sb.push("=");

this.visitTypeNode(defaultType);

}

}

// expressions

visitIdentifierExpression(node: IdentifierExpression): void {

if (node.isQuoted) this.visitStringLiteral(node.text);

else this.sb.push(node.text);

}

visitArrayLiteralExpression(node: ArrayLiteralExpression): void {

var sb = this.sb;

sb.push("[");

var elements = node.elementExpressions;

var numElements = elements.length;

if (numElements) {

if (elements[0]) this.visitNode(<Expression>elements[0]);

for (let i = 1; i < numElements; ++i) {

sb.push(", ");

if (elements[i]) this.visitNode(<Expression>elements[i]);

}

}

sb.push("]");

}

visitObjectLiteralExpression(node: ObjectLiteralExpression): void {

var sb = this.sb;

var names = node.names;

var values = node.values;

var numElements = names.length;

assert(numElements == values.length);

if (numElements) {

sb.push("{\n");

indent(sb, ++this.indentLevel);

this.visitNode(names[0]);

sb.push(": ");

this.visitNode(values[0]);

for (let i = 1; i < numElements; ++i) {

sb.push(",\n");

indent(sb, this.indentLevel);

let name = names[i];

let value = values[i];

if (name === value) {

this.visitNode(name);

} else {

this.visitNode(name);

sb.push(": ");

this.visitNode(value);

}

}

sb.push("\n");

indent(sb, --this.indentLevel);

sb.push("}");

} else {

sb.push("{}");

}

}

visitAssertionExpression(node: AssertionExpression): void {

var sb = this.sb;

switch (node.assertionKind) {

case AssertionKind.PREFIX: {

sb.push("<");

this.visitTypeNode(assert(node.toType));

sb.push(">");

this.visitNode(node.expression);

break;

}

case AssertionKind.AS: {

this.visitNode(node.expression);

sb.push(" as ");

this.visitTypeNode(assert(node.toType));

break;

}

case AssertionKind.NONNULL: {

this.visitNode(node.expression);

sb.push("!");

break;

}

default: assert(false);

}

}

visitBinaryExpression(node: BinaryExpression): void {

var sb = this.sb;

this.visitNode(node.left);

sb.push(" ");

sb.push(operatorTokenToString(node.operator));

sb.push(" ");

this.visitNode(node.right);

}

visitCallExpression(node: CallExpression): void {

var sb = this.sb;

this.visitNode(node.expression);

var typeArguments = node.typeArguments;

if (typeArguments) {

let numTypeArguments = typeArguments.length;

if (numTypeArguments) {

sb.push("<");

this.visitTypeNode(typeArguments[0]);

for (let i = 1; i < numTypeArguments; ++i) {

sb.push(", ");

this.visitTypeNode(typeArguments[i]);

}

sb.push(">(");

}

} else {

sb.push("(");

}

var args = node.arguments;

var numArgs = args.length;

if (numArgs) {

this.visitNode(args[0]);

for (let i = 1; i < numArgs; ++i) {

sb.push(", ");

this.visitNode(args[i]);

}

}

sb.push(")");

}

visitClassExpression(node: ClassExpression): void {

var declaration = node.declaration;

this.visitClassDeclaration(declaration);

}

visitCommaExpression(node: CommaExpression): void {

var expressions = node.expressions;

var numExpressions = assert(expressions.length);

this.visitNode(expressions[0]);

var sb = this.sb;

for (let i = 1; i < numExpressions; ++i) {

sb.push(",");

this.visitNode(expressions[i]);

}

}

visitElementAccessExpression(node: ElementAccessExpression): void {

var sb = this.sb;

this.visitNode(node.expression);

sb.push("[");

this.visitNode(node.elementExpression);

sb.push("]");

}

visitFunctionExpression(node: FunctionExpression): void {

var declaration = node.declaration;

if (!declaration.arrowKind) {

if (declaration.name.text.length) {

this.sb.push("function ");

} else {

this.sb.push("function");

}

} else {

assert(declaration.name.text.length == 0);

}

this.visitFunctionCommon(declaration);

}

visitLiteralExpression(node: LiteralExpression): void {

switch (node.literalKind) {

case LiteralKind.FLOAT: {

this.visitFloatLiteralExpression(<FloatLiteralExpression>node);

break;

}

case LiteralKind.INTEGER: {

this.visitIntegerLiteralExpression(<IntegerLiteralExpression>node);

break;

}

case LiteralKind.STRING: {

this.visitStringLiteralExpression(<StringLiteralExpression>node);

break;

}

case LiteralKind.REGEXP: {

this.visitRegexpLiteralExpression(<RegexpLiteralExpression>node);

break;

}

case LiteralKind.ARRAY: {

this.visitArrayLiteralExpression(<ArrayLiteralExpression>node);

break;

}

case LiteralKind.OBJECT: {

this.visitObjectLiteralExpression(<ObjectLiteralExpression>node);

break;

}

default: {

assert(false);

break;

}

}

}

visitFloatLiteralExpression(node: FloatLiteralExpression): void {

this.sb.push(node.value.toString(10));

}

visitInstanceOfExpression(node: InstanceOfExpression): void {

this.visitNode(node.expression);

this.sb.push(" instanceof ");

this.visitTypeNode(node.isType);

}

visitIntegerLiteralExpression(node: IntegerLiteralExpression): void {

this.sb.push(i64_to_string(node.value));

}

visitStringLiteral(str: string, singleQuoted: bool = false): void {

var sb = this.sb;

var off = 0;

var quote = singleQuoted ? "'" : "\"";

sb.push(quote);

var i = 0;

for (let k = str.length; i < k;) {

switch (str.charCodeAt(i)) {

case CharCode.NULL: {

if (i > off) sb.push(str.substring(off, off = i + 1));

sb.push("\\0");

off = ++i;

break;

}

case CharCode.BACKSPACE: {

if (i > off) sb.push(str.substring(off, i));

off = ++i;

sb.push("\\b");

break;

}

case CharCode.TAB: {

if (i > off) sb.push(str.substring(off, i));

off = ++i;

sb.push("\\t");

break;

}

case CharCode.LINEFEED: {

if (i > off) sb.push(str.substring(off, i));

off = ++i;

sb.push("\\n");

break;

}

case CharCode.VERTICALTAB: {

if (i > off) sb.push(str.substring(off, i));

off = ++i;

sb.push("\\v");

break;

}

case CharCode.FORMFEED: {

if (i > off) sb.push(str.substring(off, i));

off = ++i;

sb.push("\\f");

break;

}

case CharCode.CARRIAGERETURN: {

if (i > off) sb.push(str.substring(off, i));

sb.push("\\r");

off = ++i;

break;

}

case CharCode.DOUBLEQUOTE: {

if (!singleQuoted) {

if (i > off) sb.push(str.substring(off, i));

sb.push("\\\"");

off = ++i;

} else {

++i;

}

break;

}

case CharCode.SINGLEQUOTE: {

if (singleQuoted) {

if (i > off) sb.push(str.substring(off, i));

sb.push("\\'");

off = ++i;

} else {

++i;

}

break;

}

case CharCode.BACKSLASH: {

if (i > off) sb.push(str.substring(off, i));

sb.push("\\\\");

off = ++i;

break;

}

default: {

++i;

break;

}

}

}

if (i > off) sb.push(str.substring(off, i));

sb.push(quote);

}

visitStringLiteralExpression(node: StringLiteralExpression): void {

this.visitStringLiteral(node.value);

}

visitRegexpLiteralExpression(node: RegexpLiteralExpression): void {

var sb = this.sb;

sb.push("/");

sb.push(node.pattern);

sb.push("/");

sb.push(node.patternFlags);

}

visitNewExpression(node: NewExpression): void {

this.sb.push("new ");

this.visitCallExpression(node);

}

visitParenthesizedExpression(node: ParenthesizedExpression): void {

var sb = this.sb;

sb.push("(");

this.visitNode(node.expression);

sb.push(")");

}

visitPropertyAccessExpression(node: PropertyAccessExpression): void {

this.visitNode(node.expression);

this.sb.push(".");

this.visitIdentifierExpression(node.property);

}

visitTernaryExpression(node: TernaryExpression): void {

var sb = this.sb;

this.visitNode(node.condition);

sb.push(" ? ");

this.visitNode(node.ifThen);

sb.push(" : ");

this.visitNode(node.ifElse);

}

visitUnaryExpression(node: UnaryExpression): void {

switch (node.kind) {

case NodeKind.UNARYPOSTFIX: {

this.visitUnaryPostfixExpression(<UnaryPostfixExpression>node);

break;

}

case NodeKind.UNARYPREFIX: {

this.visitUnaryPrefixExpression(<UnaryPrefixExpression>node);

break;

}

default: assert(false);

}

}

visitUnaryPostfixExpression(node: UnaryPostfixExpression): void {

this.visitNode(node.operand);

this.sb.push(operatorTokenToString(node.operator));

}

visitUnaryPrefixExpression(node: UnaryPrefixExpression): void {

this.sb.push(operatorTokenToString(node.operator));

this.visitNode(node.operand);

}

// statements

visitNodeAndTerminate(statement: Statement): void {

this.visitNode(statement);

var sb = this.sb;

if (

!sb.length || // leading EmptyStatement

statement.kind == NodeKind.VARIABLE || // potentially assigns a FunctionExpression

statement.kind == NodeKind.EXPRESSION // potentially assigns a FunctionExpression

) {

sb.push(";\n");

} else {

let last = sb[sb.length - 1];

let lastCharPos = last.length - 1;

if (lastCharPos >= 0 && (

last.charCodeAt(lastCharPos) == CharCode.CLOSEBRACE ||

last.charCodeAt(lastCharPos) == CharCode.SEMICOLON)

) {

sb.push("\n");

} else {

sb.push(";\n");

}

}

}

visitBlockStatement(node: BlockStatement): void {

var sb = this.sb;

var statements = node.statements;

var numStatements = statements.length;

if (numStatements) {

sb.push("{\n");

let indentLevel = ++this.indentLevel;

for (let i = 0; i < numStatements; ++i) {

indent(sb, indentLevel);

this.visitNodeAndTerminate(statements[i]);

}

indent(sb, --this.indentLevel);

sb.push("}");

} else {

sb.push("{}");

}

}

visitBreakStatement(node: BreakStatement): void {

var label = node.label;

if (label) {

this.sb.push("break ");

this.visitIdentifierExpression(label);

} else {

this.sb.push("break");

}

}

visitContinueStatement(node: ContinueStatement): void {

var label = node.label;

if (label) {

this.sb.push("continue ");

this.visitIdentifierExpression(label);

} else {

this.sb.push("continue");

}

}

visitClassDeclaration(node: ClassDeclaration, isDefault: bool = false): void {

var decorators = node.decorators;

if (decorators) {

for (let i = 0, k = decorators.length; i < k; ++i) {

this.serializeDecorator(decorators[i]);

}

}

var sb = this.sb;

if (isDefault) {

sb.push("export default ");

} else {

this.serializeExternalModifiers(node);

}

if (node.is(CommonFlags.ABSTRACT)) sb.push("abstract ");

if (node.name.text.length) {

sb.push("class ");

this.visitIdentifierExpression(node.name);

} else {

sb.push("class");

}

var typeParameters = node.typeParameters;

if (typeParameters && typeParameters.length) {

sb.push("<");

this.visitTypeParameter(typeParameters[0]);

for (let i = 1, k = typeParameters.length; i < k; ++i) {

sb.push(", ");

this.visitTypeParameter(typeParameters[i]);

}

sb.push(">");

}

var extendsType = node.extendsType;

if (extendsType) {

sb.push(" extends ");

this.visitTypeNode(extendsType);

}

var implementsTypes = node.implementsTypes;

if (implementsTypes) {

let numImplementsTypes = implementsTypes.length;

if (numImplementsTypes) {

sb.push(" implements ");

this.visitTypeNode(implementsTypes[0]);

for (let i = 1; i < numImplementsTypes; ++i) {

sb.push(", ");

this.visitTypeNode(implementsTypes[i]);

}

}

}

var members = node.members;

var numMembers = members.length;

if (numMembers) {

sb.push(" {\n");

let indentLevel = ++this.indentLevel;

for (let i = 0, k = members.length; i < k; ++i) {

let member = members[i];

if (member.kind != NodeKind.FIELDDECLARATION || (<FieldDeclaration>member).parameterIndex < 0) {

indent(sb, indentLevel);

this.visitNodeAndTerminate(member);

}

}

indent(sb, --this.indentLevel);

sb.push("}");

} else {

sb.push(" {}");

}

}

visitDoStatement(node: DoStatement): void {

var sb = this.sb;

sb.push("do ");

this.visitNode(node.statement);

if (node.statement.kind == NodeKind.BLOCK) {

sb.push(" while (");

} else {

sb.push(";\n");

indent(sb, this.indentLevel);

sb.push("while (");

}

this.visitNode(node.condition);

sb.push(")");

}

visitEmptyStatement(node: EmptyStatement): void {

}

visitEnumDeclaration(node: EnumDeclaration, isDefault: bool = false): void {

var sb = this.sb;

if (isDefault) {

sb.push("export default ");

} else {

this.serializeExternalModifiers(node);

}

if (node.is(CommonFlags.CONST)) sb.push("const ");

sb.push("enum ");

this.visitIdentifierExpression(node.name);

var values = node.values;

var numValues = values.length;

if (numValues) {

sb.push(" {\n");

let indentLevel = ++this.indentLevel;

indent(sb, indentLevel);

this.visitEnumValueDeclaration(node.values[0]);

for (let i = 1; i < numValues; ++i) {

sb.push(",\n");

indent(sb, indentLevel);

this.visitEnumValueDeclaration(node.values[i]);

}

sb.push("\n");

indent(sb, --this.indentLevel);

sb.push("}");

} else {

sb.push(" {}");

}

}

visitEnumValueDeclaration(node: EnumValueDeclaration): void {

this.visitIdentifierExpression(node.name);

if (node.value) {

this.sb.push(" = ");

this.visitNode(node.value);

}

}

visitExportImportStatement(node: ExportImportStatement): void {

var sb = this.sb;

sb.push("export import ");

this.visitIdentifierExpression(node.externalName);

sb.push(" = ");

this.visitIdentifierExpression(node.name);

}