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vt100.js
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vt100.js
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// VT100.js -- JavaScript based terminal emulator
// Copyright (C) 2008-2009 Markus Gutschke <markus@shellinabox.com>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 2 as
// published by the Free Software Foundation.
//
// This program 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 this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// In addition to these license terms, the author grants the following
// additional rights:
//
// If you modify this program, or any covered work, by linking or
// combining it with the OpenSSL project's OpenSSL library (or a
// modified version of that library), containing parts covered by the
// terms of the OpenSSL or SSLeay licenses, the author
// grants you additional permission to convey the resulting work.
// Corresponding Source for a non-source form of such a combination
// shall include the source code for the parts of OpenSSL used as well
// as that of the covered work.
//
// You may at your option choose to remove this additional permission from
// the work, or from any part of it.
//
// It is possible to build this program in a way that it loads OpenSSL
// libraries at run-time. If doing so, the following notices are required
// by the OpenSSL and SSLeay licenses:
//
// This product includes software developed by the OpenSSL Project
// for use in the OpenSSL Toolkit. (http://www.openssl.org/)
//
// This product includes cryptographic software written by Eric Young
// (eay@cryptsoft.com)
//
//
// The most up-to-date version of this program is always available from
// http://shellinabox.com
//
//
// Notes:
//
// The author believes that for the purposes of this license, you meet the
// requirements for publishing the source code, if your web server publishes
// the source in unmodified form (i.e. with licensing information, comments,
// formatting, and identifier names intact). If there are technical reasons
// that require you to make changes to the source code when serving the
// JavaScript (e.g to remove pre-processor directives from the source), these
// changes should be done in a reversible fashion.
//
// The author does not consider websites that reference this script in
// unmodified form, and web servers that serve this script in unmodified form
// to be derived works. As such, they are believed to be outside of the
// scope of this license and not subject to the rights or restrictions of the
// GNU General Public License.
//
// If in doubt, consult a legal professional familiar with the laws that
// apply in your country.
// #define ESnormal 0
// #define ESesc 1
// #define ESsquare 2
// #define ESgetpars 3
// #define ESgotpars 4
// #define ESdeviceattr 5
// #define ESfunckey 6
// #define EShash 7
// #define ESsetG0 8
// #define ESsetG1 9
// #define ESsetG2 10
// #define ESsetG3 11
// #define ESbang 12
// #define ESpercent 13
// #define ESignore 14
// #define ESnonstd 15
// #define ESpalette 16
// #define ESstatus 17
// #define ESss2 18
// #define ESss3 19
// #define ATTR_DEFAULT 0x00F0
// #define ATTR_REVERSE 0x0100
// #define ATTR_UNDERLINE 0x0200
// #define ATTR_DIM 0x0400
// #define ATTR_BRIGHT 0x0800
// #define ATTR_BLINK 0x1000
// #define MOUSE_DOWN 0
// #define MOUSE_UP 1
// #define MOUSE_CLICK 2
function VT100(container) {
this.initializeElements(container);
this.initializeAnsiColors();
this.maxScrollbackLines = 500;
this.npar = 0;
this.par = [ ];
this.isQuestionMark = false;
this.savedX = [ ];
this.savedY = [ ];
this.savedAttr = [ ];
this.savedUseGMap = 0;
this.savedGMap = [ this.Latin1Map, this.VT100GraphicsMap,
this.CodePage437Map, this.DirectToFontMap ];
this.savedValid = [ ];
this.respondString = '';
this.statusString = '';
this.internalClipboard = undefined;
this.reset(true);
}
VT100.prototype.reset = function(clearHistory) {
this.isEsc = 0 /* ESnormal */;
this.needWrap = false;
this.autoWrapMode = true;
this.dispCtrl = false;
this.toggleMeta = false;
this.insertMode = false;
this.applKeyMode = false;
this.cursorKeyMode = false;
this.crLfMode = false;
this.offsetMode = false;
this.mouseReporting = false;
this.utfEnabled = true;
this.visualBell = typeof suppressAllAudio !=
'undefined' &&
suppressAllAudio;
this.utfCount = 0;
this.utfChar = 0;
this.style = '';
this.attr = 0x00F0 /* ATTR_DEFAULT */;
this.useGMap = 0;
this.GMap = [ this.Latin1Map,
this.VT100GraphicsMap,
this.CodePage437Map,
this.DirectToFontMap ];
this.translate = this.GMap[this.useGMap];
this.top = 0;
this.bottom = this.terminalHeight;
this.lastCharacter = ' ';
this.userTabStop = [ ];
if (clearHistory) {
for (var i = 0; i < 2; i++) {
while (this.console[i].firstChild) {
this.console[i].removeChild(this.console[i].firstChild);
}
}
}
this.enableAlternateScreen(false);
this.gotoXY(0, 0);
this.showCursor();
this.isInverted = false;
this.refreshInvertedState();
this.clearRegion(0, 0, this.terminalWidth, this.terminalHeight, this.style);
};
VT100.prototype.initializeAnsiColors = function() {
var elem = document.createElement('pre');
this.container.appendChild(elem);
this.setTextContent(elem, ' ');
this.ansi = [ ];
for (var i = 0; i < 16; i++) {
elem.id = 'ansi' + i;
this.ansi[i] = this.getCurrentComputedStyle(elem, 'backgroundColor');
}
this.container.removeChild(elem);
};
VT100.prototype.addListener = function(elem, event, listener) {
if (elem.addEventListener) {
elem.addEventListener(event, listener, false);
} else {
elem.attachEvent('on' + event, listener);
}
};
VT100.prototype.initializeElements = function(container) {
// If the necessary objects have not already been defined in the HTML
// page, create them now.
if (container) {
this.container = container;
} else if (!(this.container = document.getElementById('vt100'))) {
this.container = document.createElement('div');
this.container.id = 'vt100';
document.body.appendChild(this.container);
}
if (!this.getChildById(this.container, 'reconnect') ||
!this.getChildById(this.container, 'menu') ||
!this.getChildById(this.container, 'scrollable') ||
!this.getChildById(this.container, 'console') ||
!this.getChildById(this.container, 'alt_console') ||
!this.getChildById(this.container, 'ieprobe') ||
!this.getChildById(this.container, 'padding') ||
!this.getChildById(this.container, 'cursor') ||
!this.getChildById(this.container, 'lineheight') ||
!this.getChildById(this.container, 'space') ||
!this.getChildById(this.container, 'input') ||
!this.getChildById(this.container, 'cliphelper') ||
!this.getChildById(this.container, 'attrib')) {
// Only enable the "embed" object, if we have a suitable plugin. Otherwise,
// we might get a pointless warning that a suitable plugin is not yet
// installed. If in doubt, we'd rather just stay silent.
var embed = '';
try {
if (typeof navigator.mimeTypes["audio/x-wav"].enabledPlugin.name !=
'undefined') {
embed = typeof suppressAllAudio != 'undefined' &&
suppressAllAudio ? "" :
'<embed classid="clsid:02BF25D5-8C17-4B23-BC80-D3488ABDDC6B" ' +
'id="beep_embed" ' +
'src="beep.wav" ' +
'autostart="false" ' +
'volume="100" ' +
'enablejavascript="true" ' +
'type="audio/x-wav" ' +
'height="16" ' +
'width="200" ' +
'style="position:absolute;left:-1000px;top:-1000px" />';
}
} catch (e) {
}
this.container.innerHTML =
'<div id="reconnect" style="visibility: hidden">' +
'<input type="button" value="Connect" ' +
'onsubmit="return false" />' +
'</div>' +
'<div id="menu"></div>' +
'<div id="scrollable">' +
'<pre id="lineheight"> </pre>' +
'<pre id="console">' +
'<pre></pre>' +
'<div id="ieprobe"><span> </span></div>' +
'</pre>' +
'<pre id="alt_console" style="display: none"></pre>' +
'<div id="padding"></div>' +
'<pre id="cursor"> </pre>' +
'</div>' +
'<div class="hidden">' +
'<pre><div><span id="space"></span></div></pre>' +
'<input type="textfield" id="input" />' +
'<input type="textfield" id="cliphelper" />' +
'<span id="attrib"> </span>' +
(typeof suppressAllAudio != 'undefined' &&
suppressAllAudio ? "" :
embed + '<bgsound id="beep_bgsound" loop=1 />') +
'</div>';
}
// Find the object used for playing the "beep" sound, if any.
if (typeof suppressAllAudio != 'undefined' && suppressAllAudio) {
this.beeper = undefined;
} else {
this.beeper = this.getChildById(this.container,
'beep_embed');
if (!this.beeper || !this.beeper.Play) {
this.beeper = this.getChildById(this.container,
'beep_bgsound');
if (!this.beeper || typeof this.beeper.src == 'undefined') {
this.beeper = undefined;
}
}
}
// Initialize the variables for finding the text console and the
// cursor.
this.reconnectBtn = this.getChildById(this.container,'reconnect');
this.menu = this.getChildById(this.container, 'menu');
this.scrollable = this.getChildById(this.container,
'scrollable');
this.lineheight = this.getChildById(this.container,
'lineheight');
this.console =
[ this.getChildById(this.container, 'console'),
this.getChildById(this.container, 'alt_console') ];
var ieProbe = this.getChildById(this.container, 'ieprobe');
this.padding = this.getChildById(this.container, 'padding');
this.cursor = this.getChildById(this.container, 'cursor');
this.space = this.getChildById(this.container, 'space');
this.input = this.getChildById(this.container, 'input');
this.cliphelper = this.getChildById(this.container,
'cliphelper');
this.attributeHelper = this.getChildById(this.container, 'attrib');
// Remember the dimensions of a standard character glyph. We would
// expect that we could just check cursor.clientWidth/Height at any time,
// but it turns out that browsers sometimes invalidate these values
// (e.g. while displaying a print preview screen).
this.cursorWidth = this.cursor.clientWidth;
this.cursorHeight = this.lineheight.clientHeight;
// IE has a slightly different boxing model, that we need to compensate for
this.isIE = ieProbe.offsetTop > 1;
ieProbe = undefined;
this.console.innerHTML = '';
// Determine if the terminal window is positioned at the beginning of the
// page, or if it is embedded somewhere else in the page. For full-screen
// terminals, automatically resize whenever the browser window changes.
var marginTop = parseInt(this.getCurrentComputedStyle(
document.body, 'marginTop'));
var marginLeft = parseInt(this.getCurrentComputedStyle(
document.body, 'marginLeft'));
var marginRight = parseInt(this.getCurrentComputedStyle(
document.body, 'marginRight'));
var x = this.container.offsetLeft;
var y = this.container.offsetTop;
for (var parent = this.container; parent = parent.offsetParent; ) {
x += parent.offsetLeft;
y += parent.offsetTop;
}
this.isEmbedded = marginTop != y ||
marginLeft != x ||
(window.innerWidth ||
document.documentElement.clientWidth ||
document.body.clientWidth) -
marginRight != x + this.container.offsetWidth;
if (!this.isEmbedded) {
this.addListener(window, 'resize',
function(vt100) {
return function() {
vt100.hideContextMenu();
vt100.resizer();
}
}(this));
// Hide extra scrollbars attached to window
document.body.style.margin = '0px';
try { document.body.style.overflow ='hidden'; } catch (e) { }
try { document.body.oncontextmenu = function() {return false;};} catch(e){}
}
// Hide context menu
this.hideContextMenu();
// Add listener to reconnect button
this.addListener(this.reconnectBtn.firstChild, 'click',
function(vt100) {
return function() {
var rc = vt100.reconnect();
vt100.input.focus();
return rc;
}
}(this));
// Add input listeners
this.addListener(this.input, 'blur',
function(vt100) {
return function() { vt100.blurCursor(); } }(this));
this.addListener(this.input, 'focus',
function(vt100) {
return function() { vt100.focusCursor(); } }(this));
this.addListener(this.input, 'keydown',
function(vt100) {
return function(e) {
if (!e) e = window.event;
return vt100.keyDown(e); } }(this));
this.addListener(this.input, 'keypress',
function(vt100) {
return function(e) {
if (!e) e = window.event;
return vt100.keyPressed(e); } }(this));
this.addListener(this.input, 'keyup',
function(vt100) {
return function(e) {
if (!e) e = window.event;
return vt100.keyUp(e); } }(this));
// Attach listeners that move the focus to the <input> field. This way we
// can make sure that we can receive keyboard input.
var mouseEvent = function(vt100, type) {
return function(e) {
if (!e) e = window.event;
return vt100.mouseEvent(e, type);
};
};
this.addListener(this.scrollable,'mousedown',mouseEvent(this, 0 /* MOUSE_DOWN */));
this.addListener(this.scrollable,'mouseup', mouseEvent(this, 1 /* MOUSE_UP */));
this.addListener(this.scrollable,'click', mouseEvent(this, 2 /* MOUSE_CLICK */));
// Initialize the blank terminal window.
this.currentScreen = 0;
this.cursorX = 0;
this.cursorY = 0;
this.numScrollbackLines = 0;
this.top = 0;
this.bottom = 0x7FFFFFFF;
this.resizer();
this.focusCursor();
this.input.focus();
};
VT100.prototype.getChildById = function(parent, id) {
var nodeList = parent.all || parent.getElementsByTagName('*');
if (typeof nodeList.namedItem == 'undefined') {
for (var i = 0; i < nodeList.length; i++) {
if (nodeList[i].id == id) {
return nodeList[i];
}
}
return null;
} else {
var elem = (parent.all || parent.getElementsByTagName('*')).namedItem(id);
return elem ? elem[0] || elem : null;
}
};
VT100.prototype.getCurrentComputedStyle = function(elem, style) {
if (typeof elem.currentStyle != 'undefined') {
return elem.currentStyle[style];
} else {
return document.defaultView.getComputedStyle(elem, null)[style];
}
};
VT100.prototype.reconnect = function() {
return false;
};
VT100.prototype.showReconnect = function(state) {
if (state) {
this.reconnectBtn.style.visibility = '';
} else {
this.reconnectBtn.style.visibility = 'hidden';
}
};
VT100.prototype.repairElements = function(console) {
for (var line = console.firstChild; line; line = line.nextSibling) {
if (!line.clientHeight) {
var newLine = document.createElement(line.tagName);
newLine.style.cssText = line.style.cssText;
newLine.className = line.className;
if (line.tagName == 'DIV') {
for (var span = line.firstChild; span; span = span.nextSibling) {
var newSpan = document.createElement(span.tagName);
newSpan.style.cssText = span.style.cssText;
this.setTextContent(newSpan, this.getTextContent(span));
newLine.appendChild(newSpan);
}
} else {
this.setTextContent(newLine, this.getTextContent(line));
}
line.parentNode.replaceChild(newLine, line);
line = newLine;
}
}
};
VT100.prototype.resized = function(w, h) {
};
VT100.prototype.resizer = function() {
// The cursor can get corrupted if the print-preview is displayed in Firefox.
// Recreating it, will repair it.
var newCursor = document.createElement('pre');
this.setTextContent(newCursor, ' ');
newCursor.id = 'cursor';
newCursor.style.cssText = this.cursor.style.cssText;
this.cursor.parentNode.insertBefore(newCursor, this.cursor);
if (!newCursor.clientHeight) {
// Things are broken right now. This is probably because we are
// displaying the print-preview. Just don't change any of our settings
// until the print dialog is closed again.
newCursor.parentNode.removeChild(newCursor);
return;
} else {
// Swap the old broken cursor for the newly created one.
this.cursor.parentNode.removeChild(this.cursor);
this.cursor = newCursor;
}
// Really horrible things happen if the contents of the terminal changes
// while the print-preview is showing. We get HTML elements that show up
// in the DOM, but that do not take up any space. Find these elements and
// try to fix them.
this.repairElements(this.console[0]);
this.repairElements(this.console[1]);
// Lock the cursor size to the size of a normal character. This helps with
// characters that are taller/shorter than normal. Unfortunately, we will
// still get confused if somebody enters a character that is wider/narrower
// than normal. This can happen if the browser tries to substitute a
// characters from a different font.
this.cursor.style.width = this.cursorWidth + 'px';
this.cursor.style.height = this.cursorHeight + 'px';
// Adjust height for one pixel padding of the #vt100 element.
// The latter is necessary to properly display the inactive cursor.
var console = this.console[this.currentScreen];
var height = (this.isEmbedded ? this.container.clientHeight
: (window.innerHeight ||
document.documentElement.clientHeight ||
document.body.clientHeight))-1;
var partial = height % this.cursorHeight;
this.scrollable.style.height = (height > 0 ? height : 0) + 'px';
this.padding.style.height = (partial > 0 ? partial : 0) + 'px';
var oldTerminalHeight = this.terminalHeight;
this.updateWidth();
this.updateHeight();
// Clip the cursor to the visible screen.
var cx = this.cursorX;
var cy = this.cursorY + this.numScrollbackLines;
// The alternate screen never keeps a scroll back buffer.
this.updateNumScrollbackLines();
while (this.currentScreen && this.numScrollbackLines > 0) {
console.removeChild(console.firstChild);
this.numScrollbackLines--;
}
cy -= this.numScrollbackLines;
if (cx < 0) {
cx = 0;
} else if (cx > this.terminalWidth) {
cx = this.terminalWidth - 1;
if (cx < 0) {
cx = 0;
}
}
if (cy < 0) {
cy = 0;
} else if (cy > this.terminalHeight) {
cy = this.terminalHeight - 1;
if (cy < 0) {
cy = 0;
}
}
// Clip the scroll region to the visible screen.
if (this.bottom > this.terminalHeight ||
this.bottom == oldTerminalHeight) {
this.bottom = this.terminalHeight;
}
if (this.top >= this.bottom) {
this.top = this.bottom-1;
if (this.top < 0) {
this.top = 0;
}
}
// Truncate lines, if necessary. Explicitly reposition cursor (this is
// particularly important after changing the screen number), and reset
// the scroll region to the default.
this.truncateLines(this.terminalWidth);
this.putString(cx, cy, '', undefined);
this.scrollable.scrollTop = this.numScrollbackLines *
this.cursorHeight + 1;
// Update classNames for lines in the scrollback buffer
var line = console.firstChild;
for (var i = 0; i < this.numScrollbackLines; i++) {
line.className = 'scrollback';
line = line.nextSibling;
}
while (line) {
line.className = '';
line = line.nextSibling;
}
// Reposition the reconnect button
this.reconnectBtn.style.left = (this.terminalWidth*this.cursorWidth -
this.reconnectBtn.clientWidth)/2 + 'px';
this.reconnectBtn.style.top = (this.terminalHeight*this.cursorHeight-
this.reconnectBtn.clientHeight)/2 + 'px';
// Send notification that the window size has been changed
this.resized(this.terminalWidth, this.terminalHeight);
};
VT100.prototype.selection = function() {
try {
return '' + (window.getSelection && window.getSelection() ||
document.selection && document.selection.type == 'Text' &&
document.selection.createRange().text || '');
} catch (e) {
}
return '';
};
VT100.prototype.cancelEvent = function(event) {
try {
// For non-IE browsers
event.stopPropagation();
event.preventDefault();
} catch (e) {
}
try {
// For IE
event.cancelBubble = true;
event.returnValue = false;
event.button = 0;
event.keyCode = 0;
} catch (e) {
}
return false;
};
VT100.prototype.mouseEvent = function(event, type) {
// If any text is currently selected, do not move the focus as that would
// invalidate the selection.
var selection = this.selection();
if ((type == 1 /* MOUSE_UP */ || type == 2 /* MOUSE_CLICK */) && !selection.length) {
this.input.focus();
}
// Compute mouse position in characters.
var offsetX = this.container.offsetLeft;
var offsetY = this.container.offsetTop;
for (var e = this.container; e = e.offsetParent; ) {
offsetX += e.offsetLeft;
offsetY += e.offsetTop;
}
var x = (event.clientX - offsetX) / this.cursorWidth;
var y = ((event.clientY - offsetY) + this.scrollable.offsetTop) /
this.cursorHeight - this.numScrollbackLines;
var inside = true;
if (x >= this.terminalWidth) {
x = this.terminalWidth - 1;
inside = false;
}
if (x < 0) {
x = 0;
inside = false;
}
if (y >= this.terminalHeight) {
y = this.terminalHeight - 1;
inside = false;
}
if (y < 0) {
y = 0;
inside = false;
}
// Compute button number and modifier keys.
var button = type != 0 /* MOUSE_DOWN */ ? 3 :
typeof event.pageX != 'undefined' ? event.button :
[ undefined, 0, 2, 0, 1, 0, 1, 0 ][event.button];
if (button != undefined) {
if (event.shiftKey) {
button |= 0x04;
}
if (event.altKey || event.metaKey) {
button |= 0x08;
}
if (event.ctrlKey) {
button |= 0x10;
}
}
// Report mouse events if they happen inside of the current screen and
// with the SHIFT key unpressed. Both of these restrictions do not apply
// for button releases, as we always want to report those.
if (this.mouseReporting && !selection.length &&
(type != 0 /* MOUSE_DOWN */ || !event.shiftKey)) {
if (inside || type != 0 /* MOUSE_DOWN */) {
if (button != undefined) {
var report = '\u001B[M' + String.fromCharCode(button + 32) +
String.fromCharCode(x + 33) +
String.fromCharCode(y + 33);
if (type != 2 /* MOUSE_CLICK */) {
this.keysPressed(report);
}
// If we reported the event, stop propagating it (not sure, if this
// actually works on most browsers; blocking the global "oncontextmenu"
// even is still necessary).
return this.cancelEvent(event);
}
}
}
// Bring up context menu.
if (button == 2 && !event.shiftKey) {
if (type == 0 /* MOUSE_DOWN */) {
this.showContextMenu(event.clientX - offsetX, event.clientY - offsetY);
}
return this.cancelEvent(event);
}
if (this.mouseReporting) {
try {
event.shiftKey = false;
} catch (e) {
}
}
return true;
};
VT100.prototype.getTextContent = function(elem) {
return elem.textContent ||
(typeof elem.textContent == 'undefined' ? elem.innerText : '');
};
VT100.prototype.setTextContent = function(elem, s) {
// Updating the content of an element is an expensive operation. It actually
// pays off to first check whether the element is still unchanged.
if (typeof elem.textContent == 'undefined') {
if (elem.innerText != s) {
elem.innerText = s;
}
} else {
if (elem.textContent != s) {
elem.textContent = s;
}
}
};
VT100.prototype.insertBlankLine = function(y, style) {
// Insert a blank line a position y. This method ignores the scrollback
// buffer. The caller has to add the length of the scrollback buffer to
// the position, if necessary.
// If the position is larger than the number of current lines, this
// method just adds a new line right after the last existing one. It does
// not add any missing lines in between. It is the caller's responsibility
// to do so.
if (style == undefined) {
style = '';
}
var line;
if (!style) {
line = document.createElement('pre');
this.setTextContent(line, '\n');
} else {
line = document.createElement('div');
var span = document.createElement('span');
span.style.cssText = style;
this.setTextContent(span, this.spaces(this.terminalWidth));
line.appendChild(span);
}
line.style.height = this.cursorHeight + 'px';
var console = this.console[this.currentScreen];
if (console.childNodes.length > y) {
console.insertBefore(line, console.childNodes[y]);
} else {
console.appendChild(line);
}
};
VT100.prototype.updateWidth = function() {
this.terminalWidth = Math.floor(this.console[this.currentScreen].offsetWidth/
this.cursorWidth);
return this.terminalWidth;
};
VT100.prototype.updateHeight = function() {
// We want to be able to display either a terminal window that fills the
// entire browser window, or a terminal window that is contained in a
// <div> which is embededded somewhere in the web page.
if (this.isEmbedded) {
// Embedded terminal. Use size of the containing <div> (id="vt100").
this.terminalHeight = Math.floor((this.container.clientHeight-1) /
this.cursorHeight);
} else {
// Use the full browser window.
this.terminalHeight = Math.floor(((window.innerHeight ||
document.documentElement.clientHeight ||
document.body.clientHeight)-1)/
this.cursorHeight);
}
return this.terminalHeight;
};
VT100.prototype.updateNumScrollbackLines = function() {
var scrollback = Math.floor(
this.console[this.currentScreen].offsetHeight /
this.cursorHeight) -
this.terminalHeight;
this.numScrollbackLines = scrollback < 0 ? 0 : scrollback;
return this.numScrollbackLines;
};
VT100.prototype.truncateLines = function(width) {
if (width < 0) {
width = 0;
}
for (var line = this.console[this.currentScreen].firstChild; line;
line = line.nextSibling) {
if (line.tagName == 'DIV') {
var x = 0;
// Traverse current line and truncate if once we saw "width" characters
for (var span = line.firstChild; span;
span = span.nextSibling) {
var s = this.getTextContent(span);
var l = s.length;
if (x + l > width) {
this.setTextContent(span, s.substr(0, width - x));
while (span.nextSibling) {
line.removeChild(line.lastChild);
}
break;
}
x += l;
}
// Prune white space from the end of the current line
var span = line.lastChild;
while (span && !span.style.cssText.length) {
// Scan backwards looking for first non-space character
var s = this.getTextContent(span);
for (var i = s.length; i--; ) {
if (s.charAt(i) != ' ') {
if (i+1 != s.length) {
this.setTextContent(s.substr(0, i+1));
}
span = null;
break;
}
}
if (span) {
var sibling = span;
span = span.previousSibling;
if (span) {
// Remove blank <span>'s from end of line
line.removeChild(sibling);
} else {
// Remove entire line (i.e. <div>), if empty
var blank = document.createElement('pre');
blank.style.height = this.cursorHeight + 'px';
this.setTextContent(blank, '\n');
line.parentNode.replaceChild(blank, line);
}
}
}
}
}
};
VT100.prototype.putString = function(x, y, text, style) {
if (!style) {
style = '';
}
var yIdx = y + this.numScrollbackLines;
var line;
var sibling;
var s;
var span;
var xPos = 0;
var console = this.console[this.currentScreen];
if (!text.length && (yIdx >= console.childNodes.length ||
console.childNodes[yIdx].tagName != 'DIV')) {
// Positioning cursor to a blank location
span = null;
} else {
// Create missing blank lines at end of page
while (console.childNodes.length <= yIdx) {
// In order to simplify lookups, we want to make sure that each line
// is represented by exactly one element (and possibly a whole bunch of
// children).
// For non-blank lines, we can create a <div> containing one or more
// <span>s. For blank lines, this fails as browsers tend to optimize them
// away. But fortunately, a <pre> tag containing a newline character
// appears to work for all browsers (a would also work, but then
// copying from the browser window would insert superfluous spaces into
// the clipboard).
this.insertBlankLine(yIdx);
}
line = console.childNodes[yIdx];
// If necessary, promote blank '\n' line to a <div> tag
if (line.tagName != 'DIV') {
var div = document.createElement('div');
div.style.height = this.cursorHeight + 'px';
div.innerHTML = '<span></span>';
console.replaceChild(div, line);
line = div;
}
// Scan through list of <span>'s until we find the one where our text
// starts
span = line.firstChild;
var len;
while (span.nextSibling && xPos < x) {
len = this.getTextContent(span).length;
if (xPos + len > x) {
break;
}
xPos += len;
span = span.nextSibling;
}
if (text.length) {
// If current <span> is not long enough, pad with spaces or add new
// span
s = this.getTextContent(span);
var oldStyle = span.style.cssText;
if (xPos + s.length < x) {
if (oldStyle != '') {
span = document.createElement('span');
line.appendChild(span);
span.style.cssText = '';
oldStyle = '';
xPos += s.length;
s = '';
}
do {
s += ' ';
} while (xPos + s.length < x);
}
// If styles do not match, create a new <span>
var del = text.length - s.length + x - xPos;
if (oldStyle != style && (oldStyle || style)) {
if (xPos == x) {
// Replacing text at beginning of existing <span>
if (text.length >= s.length) {
// New text is equal or longer than existing text
s = text;
} else {
// Insert new <span> before the current one, then remove leading
// part of existing <span>, adjust style of new <span>, and finally
// set its contents
sibling = document.createElement('span');
line.insertBefore(sibling, span);
this.setTextContent(span, s.substr(text.length));
span = sibling;
s = text;
}
} else {
// Replacing text some way into the existing <span>
var remainder = s.substr(x + text.length - xPos);
this.setTextContent(span, s.substr(0, x - xPos));
xPos = x;
sibling = document.createElement('span');
if (span.nextSibling) {
line.insertBefore(sibling, span.nextSibling);
span = sibling;
if (remainder.length) {
sibling = document.createElement('span');
sibling.style.cssText = oldStyle;
this.setTextContent(sibling, remainder);
line.insertBefore(sibling, span.nextSibling);
}
} else {
line.appendChild(sibling);
span = sibling;
if (remainder.length) {
sibling = document.createElement('span');
sibling.style.cssText = oldStyle;
this.setTextContent(sibling, remainder);
line.appendChild(sibling);
}
}
s = text;
}
span.style.cssText = style;
} else {
// Overwrite (partial) <span> with new text
s = s.substr(0, x - xPos) +
text +
s.substr(x + text.length - xPos);
}
this.setTextContent(span, s);
// Delete all subsequent <span>'s that have just been overwritten
sibling = span.nextSibling;
while (del > 0 && sibling) {
s = this.getTextContent(sibling);
len = s.length;
if (len <= del) {
line.removeChild(sibling);
del -= len;
sibling = span.nextSibling;
} else {
this.setTextContent(sibling, s.substr(del));
break;
}
}
// Merge <span> with next sibling, if styles are identical
if (sibling && span.style.cssText == sibling.style.cssText) {
this.setTextContent(span,
this.getTextContent(span) +
this.getTextContent(sibling));
line.removeChild(sibling);
}
}
}
// Position cursor
this.cursorX = x + text.length;
if (this.cursorX >= this.terminalWidth) {
this.cursorX = this.terminalWidth - 1;
if (this.cursorX < 0) {
this.cursorX = 0;
}
}
var pixelX = -1;
var pixelY = -1;
if (!this.cursor.style.visibility) {
var idx = this.cursorX - xPos;