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component.js
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/**
* @fileoverview The Component class used by all PCjs components.
* @author <a href="mailto:[email protected]">Jeff Parsons</a>
* @copyright © 2012-2020 Jeff Parsons
*
* This file is part of PCjs, a computer emulation software project at <https://www.pcjs.org>.
*
* PCjs is free software: you can redistribute it and/or modify it under the terms of the
* GNU General Public License as published by the Free Software Foundation, either version 3
* of the License, or (at your option) any later version.
*
* PCjs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
* even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with PCjs. If not,
* see <http://www.gnu.org/licenses/gpl.html>.
*
* You are required to include the above copyright notice in every modified copy of this work
* and to display that copyright notice when the software starts running; see COPYRIGHT in
* <https://www.pcjs.org/modules/shared/lib/defines.js>.
*
* Some PCjs files also attempt to load external resource files, such as character-image files,
* ROM files, and disk image files. Those external resource files are not considered part of PCjs
* for purposes of the GNU General Public License, and the author does not claim any copyright
* as to their contents.
*/
/*
* All PCjs components now use JSDoc types, primarily so that Google's Closure Compiler will compile
* everything with zero warnings when ADVANCED_OPTIMIZATIONS are enabled. For more information about
* the JSDoc types supported by the Closure Compiler:
*
* https://developers.google.com/closure/compiler/docs/js-for-compiler#types
*
* I also attempted to validate this code with JSLint, but it complained too much; eg, it didn't like
* "while (true)", a tried and "true" programming convention for decades, and it wanted me to replace
* all "++" and "--" operators with "+= 1" and "-= 1", use "(s || '')" instead of "(s? s : '')", etc.
*
* I prefer sticking with traditional C-style idioms, in part because they are more portable. That
* does NOT mean I'm trying to write "portable JavaScript," but some of this code was ported from C code
* I'd written long ago, so portability is good, and I'm not going to throw that away if there's no need.
*
* UPDATE: I've since switched from JSLint to JSHint, which seems to have more reasonable defaults.
* And for new code, I have adopted some popular JavaScript idioms, like "(s || '')", although the need
* for those kinds of expressions will be reduced as I also start adopting some ES6 features, like
* default parameters.
*/
"use strict";
if (typeof module !== "undefined") {
var Str = require("../../shared/lib/strlib");
}
/**
* Since the Closure Compiler treats ES6 classes as @struct rather than @dict by default,
* it deters us from defining named properties on our components; eg:
*
* this['exports'] = {...}
*
* results in an error:
*
* Cannot do '[]' access on a struct
*
* So, in order to define 'exports', we must override the @struct assumption by annotating
* the class as @unrestricted (or @dict). Note that this must be done both here and in the
* subclass (eg, SerialPort), because otherwise the Compiler won't allow us to *reference*
* the named property either.
*
* TODO: Consider marking ALL our classes unrestricted, because otherwise it forces us to
* define every single property the class uses in its constructor, which results in a fair
* bit of redundant initialization, since many properties aren't (and don't need to be) fully
* initialized until the appropriate init(), reset(), restore(), etc. function is called.
*
* The upside, however, may be that since the structure of the class is completely defined by
* the constructor, JavaScript engines may be able to optimize and run more efficiently.
*
* @unrestricted
*/
class Component {
/**
* Component(type, parms, bitsMessage)
*
* A Component object requires:
*
* type: a user-defined type name (eg, "CPU")
*
* and accepts any or all of the following (parms) properties:
*
* id: component ID (default is "")
* name: component name (default is ""; if blank, toString() will use the type name only)
* comment: component comment string (default is undefined)
*
* Component subclasses will usually have additional (parms) properties.
*
* @param {string} type
* @param {Object} [parms]
* @param {number} [bitsMessage] selects message(s) that the component wants to enable (default is 0)
*/
constructor(type, parms, bitsMessage)
{
this.type = type;
if (!parms) parms = {'id': "", 'name': ""};
this.name = parms['name'];
this.comment = parms['comment'];
this.parms = parms;
/*
* The following Component properties need to be accessible by other machines and/or command scripts;
* well, OK, or we could have exported some new functions to walk the contents of these properties, as we
* did with findMachineComponent(), but this works just as well.
*
* Also, while the double-assignment looks silly (ie, using both dot and bracket property notation), it
* resolves a complaint from the Closure Compiler, because if we use ONLY bracket notation here, then the
* Compiler wants us to change all the other references to bracket notation as well.
*/
this.id = this['id'] = parms['id'] || "";
this.exports = this['exports'] = {};
this.bindings = this['bindings'] = {};
let i = this.id.indexOf('.');
if (i < 0) {
this.idMachine = "PCjs";
this.idComponent = this.id;
} else {
this.idMachine = this.id.substr(0, i);
this.idComponent = this.id.substr(i + 1);
}
/*
* Gather all the various component flags (booleans) into a single "flags" object, and encourage
* subclasses to do the same, to reduce the property clutter we have to wade through while debugging.
*/
this.flags = {
ready: false,
busy: false,
busyCancel: false,
initDone: false,
powered: false,
unloading: false,
error: false
};
this.fnReady = null;
this.clearError();
this.bitsMessage = bitsMessage || 0;
this.cmp = null;
this.bus = null;
this.cpu = null;
this.dbg = null;
/*
* TODO: Consider adding another parameter to the Component() constructor that allows components to tell
* us if they support single or multiple instances per machine. For example, there can be multiple SerialPort
* components per machine, but only one CPU component (some machines also support an FPU, but that component
* is considered separate from the CPU).
*
* It's not critical, but it would help catch machine configuration errors; for example, a machine that mistakenly
* includes two CPU components may, aside from wasting memory, end up with odd side-effects, like unresponsive
* CPU controls.
*/
Component.add(this);
}
/**
* Component.add(component)
*
* @param {Component} component
*/
static add(component)
{
/*
* This just generates a lot of useless noise, handy in the early days, not so much these days....
*
* if (DEBUG) Component.log("Component.add(" + component.type + "," + component.id + ")");
*/
Component.components.push(component);
}
/**
* Component.addMachine(idMachine)
*
* @param {string} idMachine
*/
static addMachine(idMachine)
{
Component.machines[idMachine] = {};
}
/**
* Component.getMachines()
*
* @return {Array.<string>}
*/
static getMachines()
{
return Object.keys(Component.machines);
}
/**
* Component.addMachineResource(idMachine, sName, data)
*
* @param {string} idMachine
* @param {string|null} sName (name of the resource)
* @param {*} data
*/
static addMachineResource(idMachine, sName, data)
{
/*
* I used to assert(Component.machines[idMachine]), but when we're running as a Node app, embed.js is not used,
* so addMachine() is never called, so resources do not need to be recorded.
*/
if (Component.machines[idMachine] && sName) {
Component.machines[idMachine][sName] = data;
}
}
/**
* Component.getMachineResources(idMachine)
*
* @param {string} idMachine
* @return {Object|undefined}
*/
static getMachineResources(idMachine)
{
return Component.machines[idMachine];
}
/**
* Component.getTime()
*
* @return {number} the current time, in milliseconds
*/
static getTime()
{
return Date.now() || +new Date();
}
/**
* Component.log(s, type)
*
* For diagnostic output only.
*
* @param {string} [s] is the message text
* @param {string} [type] is the message type
*/
static log(s, type)
{
if (!COMPILED) {
if (s) {
let sElapsed = "", sMsg = (type? (type + ": ") : "") + s;
if (typeof Usr != "undefined") {
if (Component.msStart === undefined) {
Component.msStart = Component.getTime();
}
sElapsed = (Component.getTime() - Component.msStart) + "ms: ";
}
sMsg = sMsg.replace(/\r/g, '\\r').replace(/\n/g, ' ');
if (window && window.console) console.log(sElapsed + sMsg);
}
}
}
/**
* Component.assert(f, s)
*
* Verifies conditions that must be true (for DEBUG builds only).
*
* The Closure Compiler should automatically remove all references to Component.assert() in non-DEBUG builds.
* TODO: Add a task to the build process that "asserts" there are no instances of "assertion failure" in RELEASE builds.
*
* @param {boolean} f is the expression we are asserting to be true
* @param {string} [s] is description of the assertion on failure
*/
static assert(f, s)
{
if (DEBUG) {
if (!f) {
if (!s) s = "assertion failure";
Component.log(s);
throw new Error(s);
}
}
}
/**
* Component.print(s)
*
* Components that inherit from this class should use this.print(), rather than Component.print(), because
* if a Control Panel is loaded, it will override only the instance method, not the class method (overriding the
* class method would improperly affect any other machines loaded on the same page).
*
* @this {Component}
* @param {string} s
*/
static print(s)
{
if (!COMPILED) {
let i = s.lastIndexOf('\n');
if (i >= 0) {
Component.println(s.substr(0, i));
s = s.substr(i + 1);
}
Component.printBuffer += s;
}
}
/**
* Component.println(s, type, id)
*
* Components that inherit from this class should use this.println(), rather than Component.println(), because
* if a Control Panel is loaded, it will override only the instance method, not the class method (overriding the
* class method would improperly affect any other machines loaded on the same page).
*
* @param {string} [s] is the message text
* @param {string} [type] is the message type
* @param {string} [id] is the caller's ID, if any
*/
static println(s, type, id)
{
if (!COMPILED) {
s = Component.printBuffer + (s || "");
Component.log((id? (id + ": ") : "") + (s? ("\"" + s + "\"") : ""), type);
Component.printBuffer = "";
}
}
/**
* Component.notice(s, fPrintOnly, id)
*
* notice() is like println() but implies a need for user notification, so we alert() as well.
*
* @param {string} s is the message text
* @param {boolean} [fPrintOnly]
* @param {string} [id] is the caller's ID, if any
* @return {boolean}
*/
static notice(s, fPrintOnly, id)
{
if (!COMPILED) {
Component.println(s, Component.PRINT.NOTICE, id);
}
if (!fPrintOnly) Component.alertUser((id? (id + ": ") : "") + s);
return true;
}
/**
* Component.warning(s)
*
* @param {string} s describes the warning
*/
static warning(s)
{
if (!COMPILED) {
Component.println(s, Component.PRINT.WARNING);
}
Component.alertUser(s);
}
/**
* Component.error(s)
*
* @param {string} s describes the error; an alert() is displayed as well
*/
static error(s)
{
if (!COMPILED) {
Component.println(s, Component.PRINT.ERROR);
}
Component.alertUser(s);
}
/**
* Component.alertUser(sMessage)
*
* @param {string} sMessage
*/
static alertUser(sMessage)
{
if (window) {
window.alert(sMessage);
} else {
Component.log(sMessage);
}
}
/**
* Component.confirmUser(sPrompt)
*
* @param {string} sPrompt
* @returns {boolean} true if the user clicked OK, false if Cancel/Close
*/
static confirmUser(sPrompt)
{
let fResponse = false;
if (window) {
fResponse = window.confirm(sPrompt);
}
return fResponse;
}
/**
* Component.promptUser()
*
* @param {string} sPrompt
* @param {string} [sDefault]
* @returns {string|null}
*/
static promptUser(sPrompt, sDefault)
{
let sResponse = null;
if (window) {
sResponse = window.prompt(sPrompt, sDefault === undefined? "" : sDefault);
}
return sResponse;
}
/**
* Component.appendControl(control, sText)
*
* @param {Object} control
* @param {string} sText
*/
static appendControl(control, sText)
{
control.value += sText;
/*
* Prevent the <textarea> from getting too large; otherwise, printing becomes slower and slower.
*/
if (COMPILED) {
sText = control.value;
if (sText.length > 8192) control.value = sText.substr(sText.length - 4096);
}
control.scrollTop = control.scrollHeight;
}
/**
* Component.replaceControl(control, sSearch, sReplace)
*
* @param {Object} control
* @param {string} sSearch
* @param {string} sReplace
*/
static replaceControl(control, sSearch, sReplace)
{
let sText = control.value;
let i = sText.lastIndexOf(sSearch);
if (i < 0) {
sText += sSearch + '\n';
} else {
sText = sText.substr(0, i) + sReplace + sText.substr(i + sSearch.length);
}
/*
* Prevent the <textarea> from getting too large; otherwise, printing becomes slower and slower.
*/
if (COMPILED && sText.length > 8192) sText = sText.substr(sText.length - 4096);
control.value = sText;
control.scrollTop = control.scrollHeight;
}
/**
* Component.bindExternalControl(component, sBinding, sType)
*
* @param {Component} component
* @param {string} sBinding
* @param {string} [sType] is the external component type (default is "Panel")
*/
static bindExternalControl(component, sBinding, sType = "Panel")
{
if (sBinding) {
let target = Component.getComponentByType(sType, component.id);
if (target) {
let control = target.bindings[sBinding];
if (control) {
component.setBinding("", sBinding, control);
}
}
}
}
/**
* Component.bindComponentControls(component, element, sAppClass)
*
* @param {Component} component
* @param {HTMLElement} element from the DOM
* @param {string} sAppClass
*/
static bindComponentControls(component, element, sAppClass)
{
let aeControls = Component.getElementsByClass(element.parentNode, sAppClass + "-control");
for (let iControl = 0; iControl < aeControls.length; iControl++) {
let aeChildNodes = aeControls[iControl].childNodes;
for (let iNode = 0; iNode < aeChildNodes.length; iNode++) {
let control = aeChildNodes[iNode];
if (control.nodeType !== 1 /* document.ELEMENT_NODE */) {
continue;
}
let sClass = control.getAttribute("class");
if (!sClass) continue;
let aClasses = sClass.split(" ");
for (let iClass = 0; iClass < aClasses.length; iClass++) {
let parms;
sClass = aClasses[iClass];
switch (sClass) {
case sAppClass + "-binding":
parms = Component.getComponentParms(/** @type {HTMLElement} */(control));
if (parms && parms['binding'] !== undefined) {
component.setBinding(parms['type'], parms['binding'], /** @type {HTMLElement} */(control), parms['value']);
} else if (!parms || parms['type'] != "description") {
Component.log("Component '" + component.toString() + "' missing binding" + (parms? " for " + parms['type'] : ""), "warning");
}
iClass = aClasses.length;
break;
default:
// if (DEBUG) Component.log("Component.bindComponentControls(" + component.toString() + "): unrecognized control class \"" + sClass + "\"", "warning");
break;
}
}
}
}
}
/**
* Component.getComponents(idRelated)
*
* We could store components as properties, using the component's ID, and change
* this linear lookup into a property lookup, but some components may have no ID.
*
* @param {string} [idRelated] of related component
* @return {Array} of components
*/
static getComponents(idRelated)
{
let i;
let aComponents = [];
/*
* getComponentByID(id, idRelated)
*
* If idRelated is provided, we check it for a machine prefix, and use any
* existing prefix to constrain matches to IDs with the same prefix, in order to
* avoid matching components belonging to other machines.
*/
if (idRelated) {
if ((i = idRelated.indexOf('.')) > 0)
idRelated = idRelated.substr(0, i + 1);
else
idRelated = "";
}
for (i = 0; i < Component.components.length; i++) {
let component = Component.components[i];
if (!idRelated || !component.id.indexOf(idRelated)) {
aComponents.push(component);
}
}
return aComponents;
}
/**
* Component.getComponentByID(id, idRelated)
*
* We could store components as properties, using the component's ID, and change
* this linear lookup into a property lookup, but some components may have no ID.
*
* @param {string} id of the desired component
* @param {string} [idRelated] of related component
* @return {Component|null}
*/
static getComponentByID(id, idRelated)
{
if (id !== undefined) {
let i;
/*
* If idRelated is provided, we check it for a machine prefix, and use any
* existing prefix to constrain matches to IDs with the same prefix, in order to
* avoid matching components belonging to other machines.
*/
if (idRelated && (i = idRelated.indexOf('.')) > 0) {
id = idRelated.substr(0, i + 1) + id;
}
for (i = 0; i < Component.components.length; i++) {
if (Component.components[i]['id'] === id) {
return Component.components[i];
}
}
if (Component.components.length) {
Component.log("Component ID '" + id + "' not found", "warning");
}
}
return null;
}
/**
* Component.getComponentByType(sType, idRelated, componentPrev)
*
* @param {string} sType of the desired component
* @param {string} [idRelated] of related component
* @param {Component|null} [componentPrev] of previously returned component, if any
* @return {Component|null}
*/
static getComponentByType(sType, idRelated, componentPrev)
{
if (sType !== undefined) {
let i;
/*
* If idRelated is provided, we check it for a machine prefix, and use any
* existing prefix to constrain matches to IDs with the same prefix, in order to
* avoid matching components belonging to other machines.
*/
if (idRelated) {
if ((i = idRelated.indexOf('.')) > 0) {
idRelated = idRelated.substr(0, i + 1);
} else {
idRelated = "";
}
}
for (i = 0; i < Component.components.length; i++) {
if (componentPrev) {
if (componentPrev == Component.components[i]) componentPrev = null;
continue;
}
if (sType == Component.components[i].type && (!idRelated || !Component.components[i].id.indexOf(idRelated))) {
return Component.components[i];
}
}
Component.log("Component type '" + sType + "' not found", "warning");
}
return null;
}
/**
* Component.getComponentParms(element)
*
* @param {HTMLElement} element from the DOM
*/
static getComponentParms(element)
{
let parms = null;
let sParms = element.getAttribute("data-value");
if (sParms) {
try {
parms = eval('(' + sParms + ')'); // jshint ignore:line
/*
* We can no longer invoke removeAttribute() because some components (eg, Panel) need
* to run their initXXX() code more than once, to avoid initialization-order dependencies.
*
* if (!DEBUG) {
* element.removeAttribute("data-value");
* }
*/
} catch(e) {
Component.error(e.message + " (" + sParms + ")");
}
}
return parms;
}
/**
* Component.getElementsByClass(element, sClass, sObjClass)
*
* This is a cross-browser helper function, since not all browser's support getElementsByClassName()
*
* TODO: This should probably be moved into weblib.js at some point, along with the control binding functions above,
* to keep all the browser-related code together.
*
* @param {HTMLDocument|HTMLElement|Node} element from the DOM
* @param {string} sClass
* @param {string} [sObjClass]
* @return {Array|NodeList}
*/
static getElementsByClass(element, sClass, sObjClass)
{
if (sObjClass) sClass += '-' + sObjClass + "-object";
/*
* Use the browser's built-in getElementsByClassName() if it appears to be available
* (for example, it's not available in IE8, but it should be available in IE9 and up)
*/
if (element.getElementsByClassName) {
return element.getElementsByClassName(sClass);
}
let i, j, ae = [];
let aeAll = element.getElementsByTagName("*");
let re = new RegExp('(^| )' + sClass + '( |$)');
for (i = 0, j = aeAll.length; i < j; i++) {
if (re.test(aeAll[i].className)) {
ae.push(aeAll[i]);
}
}
if (!ae.length) {
Component.log('No elements of class "' + sClass + '" found');
}
return ae;
}
/**
* Component.getScriptCommands(sScript)
*
* This is a simple parser that breaks sScript into an array of commands, where each command
* is an array of tokens, where tokens are sequences of characters separated by any of: tab, space,
* carriage-return (CR), line-feed (LF), semicolon, single-quote, or double-quote; if a quote is
* used, all characters up to the next matching quote become part of the token, allowing any of the
* other separators to be part of the token. CR, LF and semicolon also serve to terminate a command,
* with semicolon being preferred, because it's 1) more visible, and 2) essential when the entire
* script is a multi-line string where all CR/LF were replaced by spaces (which is what Jekyll does,
* and since we can't change Jekyll, it's what our own MarkDown Front Matter parser does as well;
* see convertMD() in markout.js, where the aCommandDefs array is built).
*
* Backslash sequences like \n, \r, and \\ have already been converted to LF, CR and backslash
* characters, since the entire script string is injected into a JavaScript function call, so any
* backslash sequence that JavaScript supports is automatically converted:
*
* \0 \' \" \\ \n \r \v \t \b \f \uXXXX \xXX
* ^J ^M ^K ^I ^H ^L
*
* To support any other non-printable 8-bit character, such as ESC, you should use \xXX, where XX
* is the ASCII code in hex. For ESC, that would be \x1B.
*
* @param {string} sScript
* @return {Array}
*/
static getScriptCommands(sScript)
{
let cch = sScript.length;
let aCommands = [], aTokens = [], sToken = "", chQuote = null;
for (let i = 0; i < cch; i++) {
let ch = sScript[i];
if (ch == '"' || ch == "'") {
if (chQuote && ch != chQuote) {
sToken += ch;
continue;
}
if (!chQuote) {
chQuote = ch;
} else {
chQuote = null;
}
if (sToken) {
aTokens.push(sToken);
sToken = "";
}
continue;
}
if (!chQuote) {
if (ch == '\r' || ch == '\n') {
ch = ';';
}
if (ch == ' ' || ch == '\t' || ch == ';') {
if (sToken) {
aTokens.push(sToken);
sToken = "";
}
if (ch == ';' && aTokens.length) {
aCommands.push(aTokens);
aTokens = [];
}
continue;
}
}
sToken += ch;
}
if (sToken) {
aTokens.push(sToken);
}
if (aTokens.length) {
aCommands.push(aTokens);
}
return aCommands;
}
/**
* Component.processScript(idMachine, sScript)
*
* @param {string} idMachine
* @param {string} [sScript]
* @return {boolean}
*/
static processScript(idMachine, sScript)
{
let fSuccess = false;
idMachine += ".machine";
if (!sScript) {
delete Component.commands[idMachine];
fSuccess = true;
}
else if (typeof sScript == "string" && !Component.commands[idMachine]) {
fSuccess = true;
Component.commands[idMachine] = Component.getScriptCommands(sScript);
if (!Component.processCommands(idMachine)) {
fSuccess = false;
}
}
return fSuccess;
}
/**
* Component.processCommands(idMachine)
*
* @param {string} idMachine
* @return {boolean}
*/
static processCommands(idMachine)
{
let fSuccess = true;
let aCommands = Component.commands[idMachine];
// let dbg = Component.getComponentByType("Debugger", idMachine);
while (aCommands && aCommands.length) {
let aTokens = aCommands.splice(0, 1)[0];
let sCommand = aTokens[0];
/*
* It's possible to route this output to the Debugger window with dbg.println()
* instead, but it's a bit too confusing mingling script output in a window that
* already mingles Debugger and machine output.
*/
Component.println(aTokens.join(' '), Component.PRINT.SCRIPT);
let fnCallReady = null;
if (Component.asyncCommands.indexOf(sCommand) >= 0) {
fnCallReady = function processNextCommand() {
return function() {
Component.processCommands(idMachine);
}
}();
}
let fnCommand = Component.globalCommands[sCommand];
if (fnCommand) {
if (!fnCallReady) {
fSuccess = fnCommand(aTokens[1], aTokens[2], aTokens[3]);
} else {
if (!fnCommand(fnCallReady, aTokens[1], aTokens[2], aTokens[3])) break;
}
}
else {
fSuccess = false;
let component = Component.getComponentByType(aTokens[1], idMachine);
if (component) {
fnCommand = Component.componentCommands[sCommand];
if (fnCommand) {
fSuccess = fnCommand(component, aTokens[2], aTokens[3]);
}
else {
let exports = component['exports'];
if (exports) {
fnCommand = exports[sCommand];
if (fnCommand) {
fSuccess = true;
if (!fnCallReady) {
fSuccess = fnCommand.call(component, aTokens[2], aTokens[3]);
} else {
if (!fnCommand.call(component, fnCallReady, aTokens[2], aTokens[3])) break;
}
}
}
}
}
}
if (!fSuccess) {
Component.alertUser("Script error: '" + sCommand + "' command " + (fnCommand? " failed" : " not recognized"));
break;
}
}
if (aCommands && !aCommands.length) {
delete Component.commands[idMachine];
}
return fSuccess;
}
/**
* Component.scriptAlert(sMessage)
*
* @param {string} sMessage
* @return {boolean}
*/
static scriptAlert(sMessage)
{
Component.alertUser(sMessage);
return true;
}
/**
* Component.scriptSelect(component, sBinding, sValue)
*
* @param {Component} component
* @param {string} sBinding
* @param {string} sValue
* @return {boolean}
*/
static scriptSelect(component, sBinding, sValue)
{
let fSuccess = false;
let aBindings = component['bindings'];
let control = aBindings[sBinding];
if (control) {
for (let i = 0; i < control.options.length; i++) {
if (control.options[i].textContent == sValue) {
if (control.selectedIndex != i) {
control.selectedIndex = i;
}
fSuccess = true;
break;
}
}
}
return fSuccess;
}
/**
* Component.scriptSleep(fnCallback, sDelay)
*
* @param {function()} fnCallback
* @param {string} sDelay (in milliseconds)
* @return {boolean}
*/
static scriptSleep(fnCallback, sDelay)
{
setTimeout(fnCallback, +sDelay);
return false;
}
/**
* toString()
*
* @this {Component}
* @return {string}
*/
toString()
{
return (this.name? this.name : (this.id || this.type));
}
/**
* getMachineNum()
*
* @this {Component}
* @return {number} unique machine number
*/
getMachineNum()
{
let nMachine = 1;
if (this.idMachine) {
let aDigits = this.idMachine.match(/\d+/);
if (aDigits !== null)
nMachine = parseInt(aDigits[0], 10);
}
return nMachine;
}
/**
* setBinding(sHTMLType, sBinding, control, sValue)
*
* Component's setBinding() method is intended to be overridden by subclasses.
*
* @this {Component}
* @param {string} sHTMLType is the type of the HTML control (eg, "button", "list", "text", "submit", "textarea", "canvas")
* @param {string} sBinding is the value of the 'binding' parameter stored in the HTML control's "data-value" attribute (eg, 'print')
* @param {HTMLElement} control is the HTML control DOM object (eg, HTMLButtonElement)
* @param {string} [sValue] optional data value
* @return {boolean} true if binding was successful, false if unrecognized binding request
*/
setBinding(sHTMLType, sBinding, control, sValue)
{
switch (sBinding) {
case 'clear':
if (!this.bindings[sBinding]) {
this.bindings[sBinding] = control;
control.onclick = (function(component) {
return function clearControl() {
if (component.bindings['print']) {
component.bindings['print'].value = "";
}
};
}(this));
}
return true;
case 'print':
if (!this.bindings[sBinding]) {
let controlTextArea = /** @type {HTMLTextAreaElement} */(control);
this.bindings[sBinding] = controlTextArea;
/**
* Override this.notice() with a replacement function that eliminates the Component.alertUser() call.
*
* @this {Component}
* @param {string} s
* @return {boolean}
*/