import * as net from 'net';

import {Thread} from 'vscode-debugadapter';

import * as iconv from 'iconv-lite';

import {DbgpConnection} from './dbgp';

/** The encoding all XDebug messages are encoded with */

const ENCODING = 'iso-8859-1';

/** The first packet we receive from XDebug. Returned by waitForInitPacket() */

export class InitPacket {

/** The file that was requested as a file:// URI */

fileUri: string;

/** GDGP version (1.0) */

protocolVersion: string;

/** language being debugged (PHP) */

language: string;

/** an IDE key, by default the PC name */

ideKey: string;

/** a reference to the connection this packet was received from */

connection: Connection;

/**

* @param {XMLDocument} document - An XML document to read from

* @param {Connection} connection

*/

constructor(document: XMLDocument, connection: Connection) {

const documentElement = document.documentElement;

this.fileUri = documentElement.getAttribute('fileuri');

this.language = documentElement.getAttribute('language');

this.protocolVersion = documentElement.getAttribute('protocol_version');

this.ideKey = documentElement.getAttribute('idekey');

this.connection = connection;

}

}

/** Error class for errors returned from XDebug */

export class XDebugError extends Error {

code: number;

constructor(message: string, code: number) {

super(message);

this.code = code;

this.message = message;

this.name = 'XDebugError';

}

}

/** The base class for all XDebug responses to commands executed on a connection */

export class Response {

/** A unique transaction ID that matches the one in the request */

transactionId: number;

/** The command that this is an answer for */

command: string;

/** The connection this response was received from */

connection: Connection;

/**

* contructs a new Response object from an XML document.

* If there is an error child node, an exception is thrown with the appropiate code and message.

* @param {XMLDocument} document - An XML document to read from

* @param {Connection} connection

*/

constructor(document: XMLDocument, connection: Connection) {

const documentElement = document.documentElement;

if (documentElement.hasChildNodes() && documentElement.firstChild.nodeName === 'error') {

const errorNode = <Element>documentElement.firstChild;

const code = parseInt(errorNode.getAttribute('code'));

const message = errorNode.textContent;

throw new XDebugError(message, code);

}

this.transactionId = parseInt(documentElement.getAttribute('transaction_id'));

this.command = documentElement.getAttribute('command');

this.connection = connection;

}

}

/** A response to the status command */

export class StatusResponse extends Response {

/** The current status. Can be 'break', ... */

status: string;

/** The reason for being in this status, can be 'ok', ... */

reason: string;

/** Contains the file URI if the status is 'break' */

fileUri: string;

/** Contains the line number if the status is 'break' */

line: number;

/** Contains info about the exception if the reason for breaking was an exception */

exception: {

name: string;

message: string;

code?: number;

};

constructor(document: XMLDocument, connection: Connection) {

super(document, connection);

const documentElement = document.documentElement;

this.status = documentElement.getAttribute('status');

this.reason = documentElement.getAttribute('reason');

if (documentElement.hasChildNodes()) {

const messageNode = <Element>documentElement.firstChild;

if (messageNode.hasAttribute('exception')) {

this.exception = {

name: messageNode.getAttribute('exception'),

message: messageNode.textContent

};

if (messageNode.hasAttribute('code')) {

this.exception.code = parseInt(messageNode.getAttribute('code'));

}

}

if (messageNode.hasAttribute('filename')) {

this.fileUri = messageNode.getAttribute('filename');

}

if (messageNode.hasAttribute('lineno')) {

this.line = parseInt(messageNode.getAttribute('lineno'));

}

}

}

}

export type BreakpointType = 'line' | 'call' | 'return' | 'exception' | 'conditional' | 'watch';

export type BreakpointState = 'enabled' | 'disabled';

/** Abstract base class for all breakpoints */

export abstract class Breakpoint {

/** Unique ID which is used for modifying the breakpoint (only when received through breakpoint_list) */

id: number;

/** The type of the breakpoint: line, call, return, exception, conditional or watch */

type: BreakpointType;

/** State of the breakpoint: enabled, disabled */

state: BreakpointState;

/** The connection this breakpoint is set on */

connection: Connection;

/** dynamically detects the type of breakpoint and returns the appropiate object */

public static fromXml(breakpointNode: Element, connection: Connection): Breakpoint {

switch (breakpointNode.getAttribute('type')) {

case 'exception': return new ExceptionBreakpoint(breakpointNode, connection);

case 'line': return new LineBreakpoint(breakpointNode, connection);

case 'conditional': return new ConditionalBreakpoint(breakpointNode, connection);

case 'call': return new CallBreakpoint(breakpointNode, connection);

}

}

/** Constructs a breakpoint object from an XML node from a XDebug response */

constructor(breakpointNode: Element, connection: Connection);

/** To create a new breakpoint in derived classes */

constructor(type: BreakpointType);

constructor() {

if (typeof arguments[0] === 'object') {

// from XML

const breakpointNode: Element = arguments[0];

this.connection = arguments[1];

this.type = <BreakpointType>breakpointNode.getAttribute('type');

this.id = parseInt(breakpointNode.getAttribute('id'));

this.state = <BreakpointState>breakpointNode.getAttribute('state');

} else {

this.type = arguments[0];

}

}

/** Removes the breakpoint by sending a breakpoint_remove command */

public remove() {

return this.connection.sendBreakpointRemoveCommand(this);

}

}

/** class for line breakpoints. Returned from a breakpoint_list or passed to sendBreakpointSetCommand */

export class LineBreakpoint extends Breakpoint {

/** File URI of the file in which to break */

fileUri: string;

/** Line to break on */

line: number;

/** constructs a line breakpoint from an XML node */

constructor(breakpointNode: Element, connection: Connection);

/** contructs a line breakpoint for passing to sendSetBreakpointCommand */

constructor(fileUri: string, line: number);

constructor() {

if (typeof arguments[0] === 'object') {

const breakpointNode: Element = arguments[0];

const connection: Connection = arguments[1];

super(breakpointNode, connection);

this.line = parseInt(breakpointNode.getAttribute('line'));

} else {

// construct from arguments

super('line');

this.fileUri = arguments[0];

this.line = arguments[1];

}

}

}

/** class for call breakpoints. Returned from a breakpoint_list or passed to sendBreakpointSetCommand */

export class CallBreakpoint extends Breakpoint {

/** the function to break on */

fn: string;

/** optional expression that must evaluate to true */

expression: string;

/** constructs a call breakpoint from an XML node */

constructor(breakpointNode: Element, connection: Connection);

/** contructs a call breakpoint for passing to sendSetBreakpointCommand */

constructor(fn: string, expression?: string);

constructor() {

if (typeof arguments[0] === 'object') {

const breakpointNode: Element = arguments[0];

const connection: Connection = arguments[1];

super(breakpointNode, connection);

this.fn = breakpointNode.getAttribute('function');

this.expression = breakpointNode.getAttribute('expression'); // Base64 encoded?

} else {

// construct from arguments

super('call');

this.fn = arguments[0];

this.expression = arguments[1];

}

}

}

/** class for exception breakpoints. Returned from a breakpoint_list or passed to sendBreakpointSetCommand */

export class ExceptionBreakpoint extends Breakpoint {

/** The Exception name to break on. Can also contain wildcards. */

exception: string;

/** Constructs a breakpoint object from an XML node from a XDebug response */

constructor(breakpointNode: Element, connection: Connection);

/** Constructs a breakpoint for passing it to sendSetBreakpointCommand */

constructor(exception: string);

constructor() {

if (typeof arguments[0] === 'object') {

// from XML

const breakpointNode: Element = arguments[0];

const connection: Connection = arguments[1];

super(breakpointNode, connection);

this.exception = breakpointNode.getAttribute('exception');

} else {

// from arguments

super('exception');

this.exception = arguments[0];

}

}

}

/** class for conditional breakpoints. Returned from a breakpoint_list or passed to sendBreakpointSetCommand */

export class ConditionalBreakpoint extends Breakpoint {

/** File URI */

fileUri: string;

/** Line (optional)*/

line: number;

/** The PHP expression under which to break on */

expression: string;

/** Constructs a breakpoint object from an XML node from a XDebug response */

constructor(breakpointNode: Element, connection: Connection);

/** Contructs a breakpoint object for passing to sendSetBreakpointCommand */

constructor(expression: string, fileUri: string, line?: number);

constructor() {

if (typeof arguments[0] === 'object') {

// from XML

const breakpointNode: Element = arguments[0];

const connection: Connection = arguments[1];

super(breakpointNode, connection);

this.expression = breakpointNode.getAttribute('expression'); // Base64 encoded?

} else {

// from arguments

super('conditional');

this.expression = arguments[0];

this.fileUri = arguments[1];

this.line = arguments[2];

}

}

}

/** Response to a breakpoint_set command */

export class BreakpointSetResponse extends Response {

breakpointId: number;

constructor(document: XMLDocument, connection: Connection) {

super(document, connection);

this.breakpointId = parseInt(document.documentElement.getAttribute('id'));

}

}

/** The response to a breakpoint_list command */

export class BreakpointListResponse extends Response {

/** The currently set breakpoints for this connection */

breakpoints: Breakpoint[];

/**

* @param {XMLDocument} document

* @param {Connection} connection

*/

constructor(document: XMLDocument, connection: Connection) {

super(document, connection);

this.breakpoints = Array.from(document.documentElement.childNodes).map((breakpointNode: Element) => Breakpoint.fromXml(breakpointNode, connection));

}

}

/** One stackframe inside a stacktrace retrieved through stack_get */

export class StackFrame {

/** The UI-friendly name of this stack frame, like a function name or "{main}" */

name: string;

/** The type of stack frame. Valid values are "file" and "eval" */

type: string;

/** The file URI where the stackframe was entered */

fileUri: string;

/** The line number inside file where the stackframe was entered */

line: number;

/** The level (index) inside the stack trace at which the stack frame receides */

level: number;

/** The connection this stackframe belongs to */

connection: Connection;

/**

* @param {Element} stackFrameNode

* @param {Connection} connection

*/

constructor(stackFrameNode: Element, connection: Connection) {

this.name = stackFrameNode.getAttribute('where');

this.fileUri = stackFrameNode.getAttribute('filename');

this.type = stackFrameNode.getAttribute('type');

this.line = parseInt(stackFrameNode.getAttribute('lineno'));

this.level = parseInt(stackFrameNode.getAttribute('level'));

this.connection = connection;

}

/** Returns the available contexts (scopes, such as "Local" and "Superglobals") by doing a context_names command */

public async getContexts(): Promise<Context[]> {

return (await this.connection.sendContextNamesCommand(this)).contexts;

}

}

/** The response to a stack_get command */

export class StackGetResponse extends Response {

/** The current stack trace */

stack: StackFrame[];

/**

* @param {XMLDocument} document

* @param {Connection} connection

*/

constructor(document: XMLDocument, connection: Connection) {

super(document, connection);

this.stack = Array.from(document.documentElement.childNodes).map((stackFrameNode: Element) => new StackFrame(stackFrameNode, connection));

}

}

export class SourceResponse extends Response {

source: string;

constructor(document: XMLDocument, connection: Connection) {

super(document, connection);

this.source = (new Buffer(document.documentElement.textContent, 'base64')).toString();

}

}

/** A context inside a stack frame, like "Local" or "Superglobals" */

export class Context {

/** Unique id that is used for further commands */

id: number;

/** UI-friendly name like "Local" or "Superglobals" */

name: string;

/** The stackframe this context belongs to */

stackFrame: StackFrame;

/**

* @param {Element} contextNode

* @param {StackFrame} stackFrame

*/

constructor(contextNode: Element, stackFrame: StackFrame) {

this.id = parseInt(contextNode.getAttribute('id'));

this.name = contextNode.getAttribute('name');

this.stackFrame = stackFrame;

}

/**

* Returns the properties (variables) inside this context by doing a context_get command

* @returns Promise.<Property[]>

*/

public async getProperties(): Promise<Property[]> {

return (await this.stackFrame.connection.sendContextGetCommand(this)).properties;

}

}

/** Response to a context_names command */

export class ContextNamesResponse extends Response {

/** the available contexts inside the given stack frame */

contexts: Context[];

/**

* @param {XMLDocument} document

* @param {StackFrame} stackFrame

*/

constructor(document: XMLDocument, stackFrame: StackFrame) {

super(document, stackFrame.connection);

this.contexts = Array.from(document.documentElement.childNodes).map((contextNode: Element) => new Context(contextNode, stackFrame));

}

}

/** The parent for properties inside a scope and properties retrieved through eval requests */

export abstract class BaseProperty {

/** the short name of the property */

name: string;

/** the data type of the variable. Can be string, int, float, bool, array, object, uninitialized, null or resource */

type: string;

/** the class if the type is object */

class: string;

/** a boolean indicating wether children of this property can be received or not. This is true for arrays and objects. */

hasChildren: boolean;

/** the number of children this property has, if any. Useful for showing array length. */

numberOfChildren: number;

/** the value of the property for primitive types */

value: string;

constructor(propertyNode: Element) {

if (propertyNode.hasAttribute('name')) {

this.name = propertyNode.getAttribute('name');

}

this.type = propertyNode.getAttribute('type');

if (propertyNode.hasAttribute('classname')) {

this.class = propertyNode.getAttribute('classname');

}

this.hasChildren = !!parseInt(propertyNode.getAttribute('children'));

if (this.hasChildren) {

this.numberOfChildren = parseInt(propertyNode.getAttribute('numchildren'));

} else {

const encoding = propertyNode.getAttribute('encoding');

if (encoding) {

this.value = iconv.encode(propertyNode.textContent, encoding) + '';

} else {

this.value = propertyNode.textContent;

}

}

}

}

/** a property (variable) inside a context or a child of another property */

export class Property extends BaseProperty {

/** the fully-qualified name of the property inside the context */

fullName: string;

/** the context this property belongs to */

context: Context;

/**

* @param {Element} propertyNode

* @param {Context} context

*/

constructor(propertyNode: Element, context: Context) {

super(propertyNode);

this.fullName = propertyNode.getAttribute('fullname');

this.context = context;

}

/**

* Returns the child properties of this property by doing another property_get

* @returns Promise.<Property[]>

*/

public async getChildren(): Promise<Property[]> {

if (!this.hasChildren) {

throw new Error('This property has no children');

}

return (await this.context.stackFrame.connection.sendPropertyGetCommand(this)).children;

}

}

/** The response to a context_get command */

export class ContextGetResponse extends Response {

/** the available properties inside the context */

properties: Property[];

/**

* @param {XMLDocument} document

* @param {Context} context

*/

constructor(document: XMLDocument, context: Context) {

super(document, context.stackFrame.connection);

this.properties = Array.from(document.documentElement.childNodes).map((propertyNode: Element) => new Property(propertyNode, context));

}

}

/** The response to a property_get command */

export class PropertyGetResponse extends Response {

/** the children of the given property */

children: Property[];

/**

* @param {XMLDocument} document

* @param {Property} property

*/

constructor(document: XMLDocument, property: Property) {

super(document, property.context.stackFrame.connection);

this.children = Array.from(document.documentElement.firstChild.childNodes).map((propertyNode: Element) => new Property(propertyNode, property.context));

}

}

/** class for properties returned from eval commands. These don't have a full name or an ID, but have all children already inlined. */

export class EvalResultProperty extends BaseProperty {

children: EvalResultProperty[];

constructor(propertyNode: Element) {

super(propertyNode);

if (this.hasChildren) {

this.children = Array.from(propertyNode.childNodes).map((propertyNode: Element) => new EvalResultProperty(propertyNode));

}

}

}

/** The response to an eval command */

export class EvalResponse extends Response {

/** the result of the expression, if there was any */

result: EvalResultProperty;

constructor(document: XMLDocument, connection: Connection) {

super(document, connection);

if (document.documentElement.hasChildNodes()) {

this.result = new EvalResultProperty(<Element>document.documentElement.firstChild);

}

}

}

/** The response to an feature_set command */

export class FeatureSetResponse extends Response {

/** the feature that was set */

feature: string;

constructor(document: XMLDocument, connection: Connection) {

super(document, connection);

this.feature = document.documentElement.getAttribute('feature');

}

}

/** A command inside the queue */

interface Command {

/** The name of the command, like breakpoint_list */

name: string;

/** All arguments as one string */

args?: string;

/** Data that gets appended after an " -- " in base64 */

data?: string;

/** callback that gets called with an XML document when a response arrives that could be parsed */

resolveFn: (response: XMLDocument) => any;

/** callback that gets called if an error happened while parsing the response */

rejectFn: (error?: Error) => any;

}

/**

* This class represents a connection to XDebug and is instantiated with a socket.

*/

export class Connection extends DbgpConnection {

/** a counter for unique connection IDs */

private static _connectionCounter = 1;

/** unique connection ID */

public id: number;

/** the time this connection was established */

public timeEstablished: Date;

/** a counter for unique transaction IDs. */

private _transactionCounter = 1;

/** the promise that gets resolved once we receive the init packet */

private _initPromise: Promise<InitPacket>;

/** resolves the init promise */

private _initPromiseResolveFn: (initPackt: InitPacket) => any;

/** rejects the init promise */

private _initPromiseRejectFn: (err?: Error) => any;

/**

* a map from transaction IDs to pending commands that have been sent to XDebug and are awaiting a response.

* This should in theory only contain max one element at any time.

*/

private _pendingCommands = new Map<number, Command>();

/**

* XDebug does NOT support async communication.

* This means before sending a new command, we have to wait until we get a response for the previous.

* This array is a stack of commands that get passed to _sendCommand once XDebug can accept commands again.

*/

private _commandQueue: Command[] = [];

/** Constructs a new connection that uses the given socket to communicate with XDebug. */

constructor(socket: net.Socket) {

super(socket);

this.id = Connection._connectionCounter++;

this.timeEstablished = new Date();

this._initPromise = new Promise<InitPacket>((resolve, reject) => {

this._initPromiseResolveFn = resolve;

this._initPromiseRejectFn = reject;

});

this.on('message', (response: XMLDocument) => {

if (response.documentElement.nodeName === 'init') {

this._initPromiseResolveFn(new InitPacket(response, this));

} else {

const transactionId = parseInt(response.documentElement.getAttribute('transaction_id'));

if (this._pendingCommands.has(transactionId)) {

const command = this._pendingCommands.get(transactionId);

this._pendingCommands.delete(transactionId);

command.resolveFn(response);

}

if (this._commandQueue.length > 0) {

const command = this._commandQueue.shift();

this._executeCommand(command).catch(command.rejectFn);

}

}

});

}

/** Returns a promise that gets resolved once the init packet arrives */

public waitForInitPacket(): Promise<InitPacket> {

return this._initPromise;

}

/**

* Pushes a new command to the queue that will be executed after all the previous commands have finished and we received a response.

* If the queue is empty AND there are no pending transactions (meaning we already received a response and XDebug is waiting for

* commands) the command will be executed emidiatly.

*/

private _enqueueCommand(name: string, args?: string, data?: string): Promise<XMLDocument> {

return new Promise((resolveFn, rejectFn) => {

const command = {name, args, data, resolveFn, rejectFn};

if (this._commandQueue.length === 0 && this._pendingCommands.size === 0) {

this._executeCommand(command);

} else {

this._commandQueue.push(command);

}

});

}

/**

* Sends a command to XDebug with a new transaction ID and calls the callback on the command. This can

* only be called when XDebug can actually accept commands, which is after we received a response for the

* previous command.

*/

private async _executeCommand(command: Command): Promise<void> {

const transactionId = this._transactionCounter++;

let commandString = command.name + ' -i ' + transactionId;

if (command.args) {

commandString += ' ' + command.args;

}

if (command.data) {

commandString += ' -- ' + (new Buffer(command.data)).toString('base64');

}

commandString += '\0';

const data = iconv.encode(commandString, ENCODING);

await this.write(data);

this._pendingCommands.set(transactionId, command);

}

public close() {

this._commandQueue = [];

this._initPromiseRejectFn(new Error('connection closed'));

return super.close();

}

// ------------------------ status --------------------------------------------

/** Sends a status command */

public async sendStatusCommand(): Promise<StatusResponse> {

return new StatusResponse(await this._enqueueCommand('status'), this);

}

// ------------------------ feature negotiation --------------------------------

/**

* Sends a feature_get command

* feature can be one of

* - language_supports_threads

* - language_name

* - language_version

* - encoding

* - protocol_version

* - supports_async

* - data_encoding

* - breakpoint_languages

* - breakpoint_types

* - multiple_sessions

* - max_children

* - max_data

* - max_depth

* - extended_properties

* optional features:

* - supports_postmortem

* - show_hidden

* - notify_ok

* or any command.

*/

public async sendFeatureGetCommand(feature: string): Promise<XMLDocument> {

return await this._enqueueCommand('feature_get', `-n feature`);

}

/**

* Sends a feature_set command

* feature can be one of

* - multiple_sessions

* - max_children

* - max_data

* - max_depth

* - extended_properties

* optional features:

* - show_hidden

* - notify_ok

*/

public async sendFeatureSetCommand(feature: string, value: string): Promise<FeatureSetResponse> {

return new FeatureSetResponse(await this._enqueueCommand('feature_set', `-n ${feature} -v ${value}`), this);

}

// ---------------------------- breakpoints ------------------------------------

/**

* Sends a breakpoint_set command that sets a breakpoint.

* @param {Breakpoint} breakpoint - an instance of LineBreakpoint, ConditionalBreakpoint or ExceptionBreakpoint

* @returns Promise.<BreakpointSetResponse>

*/

public async sendBreakpointSetCommand(breakpoint: Breakpoint): Promise<BreakpointSetResponse> {

let args = `-t ${breakpoint.type}`;

let data: string;

if (breakpoint instanceof LineBreakpoint) {

args += ` -f ${breakpoint.fileUri} -n ${breakpoint.line}`;

} else if (breakpoint instanceof ExceptionBreakpoint) {

args += ` -x ${breakpoint.exception}`;

} else if (breakpoint instanceof ConditionalBreakpoint) {

args += ` -f ${breakpoint.fileUri}`;

if (typeof breakpoint.line === 'number') {

args += ` -n ${breakpoint.line}`;

}

data = breakpoint.expression;

} else if (breakpoint instanceof CallBreakpoint) {

args += ` -m ${breakpoint.fn}`;

data = breakpoint.expression;

}

return new BreakpointSetResponse(await this._enqueueCommand('breakpoint_set', args, data), this);

}

/** sends a breakpoint_list command */

public async sendBreakpointListCommand(): Promise<BreakpointListResponse> {

return new BreakpointListResponse(await this._enqueueCommand('breakpoint_list'), this);

}

/** sends a breakpoint_remove command */

public async sendBreakpointRemoveCommand(breakpoint: Breakpoint): Promise<Response> {

return new Response(await this._enqueueCommand('breakpoint_remove', `-d ${breakpoint.id}`), this);

}

// ----------------------------- continuation ---------------------------------

/** sends a run command */

public async sendRunCommand(): Promise<StatusResponse> {

return new StatusResponse(await this._enqueueCommand('run'), this);

}

/** sends a step_into command */

public async sendStepIntoCommand(): Promise<StatusResponse> {

return new StatusResponse(await this._enqueueCommand('step_into'), this);

}

/** sends a step_over command */

public async sendStepOverCommand(): Promise<StatusResponse> {

return new StatusResponse(await this._enqueueCommand('step_over'), this);

}

/** sends a step_out command */

public async sendStepOutCommand(): Promise<StatusResponse> {

return new StatusResponse(await this._enqueueCommand('step_out'), this);

}

/** sends a stop command */

public async sendStopCommand(): Promise<StatusResponse> {

return new StatusResponse(await this._enqueueCommand('stop'), this);

}

// ------------------------------ stack ----------------------------------------

/** Sends a stack_get command */

public async sendStackGetCommand(): Promise<StackGetResponse> {

return new StackGetResponse(await this._enqueueCommand('stack_get'), this);

}

public async sendSourceCommand(uri: string): Promise<SourceResponse> {

return new SourceResponse(await this._enqueueCommand('source', `-f ${uri}`), this);

}

// ------------------------------ context --------------------------------------

/** Sends a context_names command. */

public async sendContextNamesCommand(stackFrame: StackFrame): Promise<ContextNamesResponse> {

return new ContextNamesResponse(await this._enqueueCommand('context_names', `-d ${stackFrame.level}`), stackFrame);

}

/** Sends a context_get comand */

public async sendContextGetCommand(context: Context): Promise<ContextGetResponse> {

return new ContextGetResponse(await this._enqueueCommand('context_get', `-d ${context.stackFrame.level} -c ${context.id}`), context);

}

/** Sends a property_get command */

public async sendPropertyGetCommand(property: Property): Promise<PropertyGetResponse> {

const escapedFullName = '"' + property.fullName.replace(/"/g, '\\"') + '"';

return new PropertyGetResponse(await this._enqueueCommand('property_get', `-d ${property.context.stackFrame.level} -c ${property.context.id} -n ${property.fullName}`), property);

}

// ------------------------------- eval -----------------------------------------

/** sends an eval command */

public async sendEvalCommand(expression: string): Promise<EvalResponse> {

return new EvalResponse(await this._enqueueCommand('eval', null, expression), this);

}

}