hypernal/term.js

/**
* States
*/
var normal = 0,
    escaped = 1,
    csi = 2,
    osc = 3,
    charset = 4,
    dcs = 5,
    ignore = 6;

/**
* Terminal
*/

var EventEmitter = require('events')
    .EventEmitter;

module.exports = Terminal;

function Terminal(cols, rows, opts) {
    if (!(this instanceof Terminal)) return new Terminal(cols, rows, handler);
    EventEmitter.call(this);

    this._options = opts || {};

    this.cols = cols || Terminal.geometry[0];
    this.rows = rows || Terminal.geometry[1];

    if (this._options.handler) {
        this.on('data', handler);
    }

    this.ybase = 0;
    this.ydisp = 0;
    this.x = 0;
    this.y = 0;
    this.cursorState = 0;
    this.cursorHidden = false;
    this.convertEol = false;
    this.state = 0;
    this.queue = '';
    this.scrollTop = 0;
    this.scrollBottom = this.rows - 1;

    // modes
    this.applicationKeypad = false;
    this.originMode = false;
    this.insertMode = false;
    this.wraparoundMode = false;
    this.normal = null;

    // charset
    this.charset = null;
    this.gcharset = null;
    this.glevel = 0;
    this.charsets = [null];

    // mouse properties
    this.decLocator;
    this.x10Mouse;
    this.vt200Mouse;
    this.vt300Mouse;
    this.normalMouse;
    this.mouseEvents;
    this.sendFocus;
    this.utfMouse;
    this.sgrMouse;
    this.urxvtMouse;

    // misc
    this.element;
    this.children;
    this.refreshStart;
    this.refreshEnd;
    this.savedX;
    this.savedY;
    this.savedCols;

    // stream
    this.readable = true;
    this.writable = true;

    this.defAttr = (257 << 9) | 256;
    this.curAttr = this.defAttr;

    this.params = [];
    this.currentParam = 0;
    this.prefix = '';
    this.postfix = '';

    this.lines = [];
    var i = this.rows;
    while (i--) {
        this.lines.push(this.blankLine());
    }

    this.tabs;
    this.setupStops();

    this.tabspace = this._options.tabspace || '  ';
}

inherits(Terminal, EventEmitter);

/**
* Colors
*/

// Colors 0-15
Terminal.colors = [
// dark:
'#2e3436', '#cc0000', '#4e9a06', '#c4a000', '#3465a4', '#75507b', '#06989a', '#d3d7cf',
// bright:
'#555753', '#ef2929', '#8ae234', '#fce94f', '#729fcf', '#ad7fa8', '#34e2e2', '#eeeeec'];

// Colors 16-255
// Much thanks to TooTallNate for writing this.
Terminal.colors = (function() {
    var colors = Terminal.colors,
        r = [0x00, 0x5f, 0x87, 0xaf, 0xd7, 0xff],
        i;

    // 16-231
    i = 0;
    for (; i < 216; i++) {
        out(r[(i / 36) % 6 | 0], r[(i / 6) % 6 | 0], r[i % 6]);
    }

    // 232-255 (grey)
    i = 0;
    for (; i < 24; i++) {
        r = 8 + i * 10;
        out(r, r, r);
    }

    function out(r, g, b) {
        colors.push('#' + hex(r) + hex(g) + hex(b));
    }

    function hex(c) {
        c = c.toString(16);
        return c.length < 2 ? '0' + c : c;
    }

    return colors;
})();

// Default BG/FG
Terminal.defaultColors = {
    bg: '#000000',
    fg: '#f0f0f0'
};

Terminal.colors[256] = Terminal.defaultColors.bg;
Terminal.colors[257] = Terminal.defaultColors.fg;

/**
* Options
*/

Terminal.termName = 'xterm';
Terminal.geometry = [80, 24];
Terminal.cursorBlink = true;
Terminal.visualBell = false;
Terminal.popOnBell = false;
Terminal.scrollback = 1000;
Terminal.screenKeys = false;
Terminal.programFeatures = false;
Terminal.debug = false;

/**
* Focused Terminal
*/

Terminal.focus = null;

Terminal.prototype.focus = function() {
    if (Terminal.focus === this) return;
    if (Terminal.focus) {
        Terminal.focus.cursorState = 0;
        Terminal.focus.refresh(Terminal.focus.y, Terminal.focus.y);
        if (Terminal.focus.sendFocus) Terminal.focus.send('\x1b[O');
    }
    Terminal.focus = this;
    if (this.sendFocus) this.send('\x1b[I');
    this.showCursor();
};

/**
* Global Events for key handling
*/

Terminal.bindKeys = function() {
    if (Terminal.focus) return;

    // We could put an "if (Terminal.focus)" check
    // here, but it shouldn't be necessary.
    on(document, 'keydown', function(ev) {
        return Terminal.focus.keyDown(ev);
    }, true);

    on(document, 'keypress', function(ev) {
        return Terminal.focus.keyPress(ev);
    }, true);
};

/**
* Open Terminal
*/

Terminal.prototype.open = function() {
    var self = this,
        i = 0,
        div;

    this.element = document.createElement('div');
    this.element.className = 'terminal';
    this.children = [];

    for (; i < this.rows; i++) {
        div = document.createElement('div');
        this.element.appendChild(div);
        this.children.push(div);
    }

    //document.body.appendChild(this.element);

    this.refresh(0, this.rows - 1);

    //Terminal.bindKeys();
    this.focus();

    this.startBlink();

    on(this.element, 'mousedown', function() {
        self.focus();
    });

    // This probably shouldn't work,
    // ... but it does. Firefox's paste
    // event seems to only work for textareas?
    on(this.element, 'mousedown', function(ev) {
        var button = ev.button != null ? +ev.button : ev.which != null ? ev.which - 1 : null;

        // Does IE9 do this?
        if (~navigator.userAgent.indexOf('MSIE')) {
            button = button === 1 ? 0 : button === 4 ? 1 : button;
        }

        if (button !== 2) return;

        self.element.contentEditable = 'true';
        setTimeout(function() {
            self.element.contentEditable = 'inherit'; // 'false';
        }, 1);
    }, true);

    on(this.element, 'paste', function(ev) {
        if (ev.clipboardData) {
            self.send(ev.clipboardData.getData('text/plain'));
        } else if (window.clipboardData) {
            self.send(window.clipboardData.getData('Text'));
        }
        // Not necessary. Do it anyway for good measure.
        self.element.contentEditable = 'inherit';
        return cancel(ev);
    });

    this.bindMouse();

    // XXX - hack, move this somewhere else.
    if (Terminal.brokenBold == null) {
        Terminal.brokenBold = isBoldBroken();
    }

    // sync default bg/fg colors
    this.element.style.backgroundColor = Terminal.defaultColors.bg;
    this.element.style.color = Terminal.defaultColors.fg;

    //this.emit('open');
};

// XTerm mouse events
// http://invisible-island.net/xterm/ctlseqs/ctlseqs.html#Mouse%20Tracking
// To better understand these
// the xterm code is very helpful:
// Relevant files:
// button.c, charproc.c, misc.c
// Relevant functions in xterm/button.c:
// BtnCode, EmitButtonCode, EditorButton, SendMousePosition
Terminal.prototype.bindMouse = function() {
    var el = this.element,
        self = this,
        pressed = 32;

    var wheelEvent = 'onmousewheel' in window ? 'mousewheel' : 'DOMMouseScroll';

    // mouseup, mousedown, mousewheel
    // left click: ^[[M 3<^[[M#3<
    // mousewheel up: ^[[M`3>
    function sendButton(ev) {
        var button, pos;

        // get the xterm-style button
        button = getButton(ev);

        // get mouse coordinates
        pos = getCoords(ev);
        if (!pos) return;

        sendEvent(button, pos);

        switch (ev.type) {
        case 'mousedown':
            pressed = button;
            break;
        case 'mouseup':
            // keep it at the left
            // button, just in case.
            pressed = 32;
            break;
        case wheelEvent:
            // nothing. don't
            // interfere with
            // `pressed`.
            break;
        }
    }

    // motion example of a left click:
    // ^[[M 3<^[[M@4<^[[M@5<^[[M@6<^[[M@7<^[[M#7<
    function sendMove(ev) {
        var button = pressed,
            pos;

        pos = getCoords(ev);
        if (!pos) return;

        // buttons marked as motions
        // are incremented by 32
        button += 32;

        sendEvent(button, pos);
    }

    // encode button and
    // position to characters
    function encode(data, ch) {
        if (!self.utfMouse) {
            if (ch === 255) return data.push(0);
            if (ch > 127) ch = 127;
            data.push(ch);
        } else {
            if (ch === 2047) return data.push(0);
            if (ch < 127) {
                data.push(ch);
            } else {
                if (ch > 2047) ch = 2047;
                data.push(0xC0 | (ch >> 6));
                data.push(0x80 | (ch & 0x3F));
            }
        }
    }

    // send a mouse event:
    // regular/utf8: ^[[M Cb Cx Cy
    // urxvt: ^[[ Cb ; Cx ; Cy M
    // sgr: ^[[ Cb ; Cx ; Cy M/m
    // vt300: ^[[ 24(1/3/5)~ [ Cx , Cy ] \r
    // locator: CSI P e ; P b ; P r ; P c ; P p & w
    function sendEvent(button, pos) {
        // self.emit('mouse', {
        // x: pos.x - 32,
        // y: pos.x - 32,
        // button: button
        // });

        if (self.vt300Mouse) {
            // NOTE: Unstable.
            // http://www.vt100.net/docs/vt3xx-gp/chapter15.html
            button &= 3;
            pos.x -= 32;
            pos.y -= 32;
            var data = '\x1b[24';
            if (button === 0) data += '1';
            else if (button === 1) data += '3';
            else if (button === 2) data += '5';
            else if (button === 3) return;
            else data += '0';
            data += '~[' + pos.x + ',' + pos.y + ']\r';
            self.send(data);
            return;
        }

        if (self.decLocator) {
            // NOTE: Unstable.
            button &= 3;
            pos.x -= 32;
            pos.y -= 32;
            if (button === 0) button = 2;
            else if (button === 1) button = 4;
            else if (button === 2) button = 6;
            else if (button === 3) button = 3;
            self.send('\x1b[' + button + ';' + (button === 3 ? 4 : 0) + ';' + pos.y + ';' + pos.x + ';' + (pos.page || 0) + '&w');
            return;
        }

        if (self.urxvtMouse) {
            pos.x -= 32;
            pos.y -= 32;
            pos.x++;
            pos.y++;
            self.send('\x1b[' + button + ';' + pos.x + ';' + pos.y + 'M');
            return;
        }

        if (self.sgrMouse) {
            pos.x -= 32;
            pos.y -= 32;
            self.send('\x1b[<' + ((button & 3) === 3 ? button & ~3 : button) + ';' + pos.x + ';' + pos.y + ((button & 3) === 3 ? 'm' : 'M'));
            return;
        }

        var data = [];

        encode(data, button);
        encode(data, pos.x);
        encode(data, pos.y);

        self.send('\x1b[M' + String.fromCharCode.apply(String, data));
    }

    function getButton(ev) {
        var button, shift, meta, ctrl, mod;

        // two low bits:
        // 0 = left
        // 1 = middle
        // 2 = right
        // 3 = release
        // wheel up/down:
        // 1, and 2 - with 64 added
        switch (ev.type) {
        case 'mousedown':
            button = ev.button != null ? +ev.button : ev.which != null ? ev.which - 1 : null;

            if (~navigator.userAgent.indexOf('MSIE')) {
                button = button === 1 ? 0 : button === 4 ? 1 : button;
            }
            break;
        case 'mouseup':
            button = 3;
            break;
        case 'DOMMouseScroll':
            button = ev.detail < 0 ? 64 : 65;
            break;
        case 'mousewheel':
            button = ev.wheelDeltaY > 0 ? 64 : 65;
            break;
        }

        // next three bits are the modifiers:
        // 4 = shift, 8 = meta, 16 = control
        shift = ev.shiftKey ? 4 : 0;
        meta = ev.metaKey ? 8 : 0;
        ctrl = ev.ctrlKey ? 16 : 0;
        mod = shift | meta | ctrl;

        // no mods
        if (self.vt200Mouse) {
            // ctrl only
            mod &= ctrl;
        } else if (!self.normalMouse) {
            mod = 0;
        }

        // increment to SP
        button = (32 + (mod << 2)) + button;

        return button;
    }

    // mouse coordinates measured in cols/rows
    function getCoords(ev) {
        var x, y, w, h, el;

        // ignore browsers without pageX for now
        if (ev.pageX == null) return;

        x = ev.pageX;
        y = ev.pageY;
        el = self.element;

        // should probably check offsetParent
        // but this is more portable
        while (el !== document.documentElement) {
            x -= el.offsetLeft;
            y -= el.offsetTop;
            el = el.parentNode;
        }

        // convert to cols/rows
        w = self.element.clientWidth;
        h = self.element.clientHeight;
        x = ((x / w) * self.cols) | 0;
        y = ((y / h) * self.rows) | 0;

        // be sure to avoid sending
        // bad positions to the program
        if (x < 0) x = 0;
        if (x > self.cols) x = self.cols;
        if (y < 0) y = 0;
        if (y > self.rows) y = self.rows;

        // xterm sends raw bytes and
        // starts at 32 (SP) for each.
        x += 32;
        y += 32;

        return {
            x: x,
            y: y,
            down: ev.type === 'mousedown',
            up: ev.type === 'mouseup',
            wheel: ev.type === wheelEvent,
            move: ev.type === 'mousemove'
        };
    }

    on(el, 'mousedown', function(ev) {
        if (!self.mouseEvents) return;

        // send the button
        sendButton(ev);

        // ensure focus
        self.focus();

        // fix for odd bug
        if (self.vt200Mouse) {
            sendButton({
                __proto__: ev,
                type: 'mouseup'
            });
            return cancel(ev);
        }

        // bind events
        if (self.normalMouse) on(document, 'mousemove', sendMove);

        // x10 compatibility mode can't send button releases
        if (!self.x10Mouse) {
            on(document, 'mouseup', function up(ev) {
                sendButton(ev);
                if (self.normalMouse) off(document, 'mousemove', sendMove);
                off(document, 'mouseup', up);
                return cancel(ev);
            });
        }

        return cancel(ev);
    });

    on(el, wheelEvent, function(ev) {
        if (!self.mouseEvents) return;
        if (self.x10Mouse || self.vt300Mouse || self.decLocator) return;
        sendButton(ev);
        return cancel(ev);
    });

    // allow mousewheel scrolling in
    // the shell for example
    on(el, wheelEvent, function(ev) {
        if (self.mouseEvents) return;
        if (self.applicationKeypad) return;
        if (ev.type === 'DOMMouseScroll') {
            self.scrollDisp(ev.detail < 0 ? -5 : 5);
        } else {
            self.scrollDisp(ev.wheelDeltaY > 0 ? -5 : 5);
        }
        return cancel(ev);
    });
};

/**
* Destroy Terminal
*/

Terminal.prototype.destroy = function() {
    this.readable = false;
    this.writable = false;
    this._events = {};
    this.handler = function() {};
    this.write = function() {};
    //this.emit('close');
};

/**
* Rendering Engine
*/

// In the screen buffer, each character
// is stored as a an array with a character
// and a 32-bit integer.
// First value: a utf-16 character.
// Second value:
// Next 9 bits: background color (0-511).
// Next 9 bits: foreground color (0-511).
// Next 14 bits: a mask for misc. flags:
// 1=bold, 2=underline, 4=inverse

Terminal.prototype.refresh = function(start, end) {
    var x, y, i, line, out, ch, width, data, attr, fgColor, bgColor, flags, row, parent;

    if (end - start >= this.rows / 2) {
        parent = this.element.parentNode;
        if (parent) parent.removeChild(this.element);
    }

    width = this.cols;
    y = start;

    // if (end > this.lines.length) {
    // end = this.lines.length;
    // }

    for (; y <= end; y++) {
        row = y + this.ydisp;

        line = this.lines[row];
        out = '';

        if (y === this.y && this.cursorState && this.ydisp === this.ybase && !this.cursorHidden) {
            x = this.x;
        } else {
            x = -1;
        }

        attr = this.defAttr;
        i = 0;

        for (; i < width; i++) {
            data = line[i][0];
            ch = line[i][1];

            if (i === x) data = -1;

            if (data !== attr) {
                if (attr !== this.defAttr) {
                    out += '</span>';
                }
                if (data !== this.defAttr) {
                    if (data === -1) {
                        out += '<span class="reverse-video">';
                    } else {
                        out += '<span style="';

                        bgColor = data & 0x1ff;
                        fgColor = (data >> 9) & 0x1ff;
                        flags = data >> 18;

                        if (flags & 1) {
                            if (!Terminal.brokenBold) {
                                out += 'font-weight:bold;';
                            }
                            // see: XTerm*boldColors
                            if (fgColor < 8) fgColor += 8;
                        }

                        if (flags & 2) {
                            out += 'text-decoration:underline;';
                        }

                        if (bgColor !== 256) {
                            out += 'background-color:' + Terminal.colors[bgColor] + ';';
                        }

                        if (fgColor !== 257) {
                            out += 'color:' + Terminal.colors[fgColor] + ';';
                        }

                        out += '">';
                    }
                }
            }

            switch (ch) {
            case '&':
                out += '&';
                break;
            case '<':
                out += '<';
                break;
            case '>':
                out += '>';
                break;
            default:
                if (ch <= ' ') {
                    out += ' ';
                } else {
                    out += ch;
                }
                break;
            }

            attr = data;
        }

        if (attr !== this.defAttr) {
            out += '</span>';
        }

        this.children[y].innerHTML = out;
    }

    if (parent) parent.appendChild(this.element);
};

Terminal.prototype.cursorBlink = function() {
    if (Terminal.focus !== this) return;
    this.cursorState ^= 1;
    this.refresh(this.y, this.y);
};

Terminal.prototype.showCursor = function() {
    if (!this.cursorState) {
        this.cursorState = 1;
        this.refresh(this.y, this.y);
    } else {
        // Temporarily disabled:
        // this.refreshBlink();
    }
};

Terminal.prototype.startBlink = function() {
    if (!Terminal.cursorBlink) return;
    var self = this;
    this._blinker = function() {
        self.cursorBlink();
    };
    this._blink = setInterval(this._blinker, 500);
};

Terminal.prototype.refreshBlink = function() {
    if (!Terminal.cursorBlink) return;
    clearInterval(this._blink);
    this._blink = setInterval(this._blinker, 500);
};

Terminal.prototype.scroll = function() {
    var row;

    if (++this.ybase === Terminal.scrollback) {
        this.ybase = this.ybase / 2 | 0;
        this.lines = this.lines.slice(-(this.ybase + this.rows) + 1);
    }

    this.ydisp = this.ybase;

    // last line
    row = this.ybase + this.rows - 1;

    // subtract the bottom scroll region
    row -= this.rows - 1 - this.scrollBottom;

    if (row === this.lines.length) {
        // potential optimization:
        // pushing is faster than splicing
        // when they amount to the same
        // behavior.
        this.lines.push(this.blankLine());
    } else {
        // add our new line
        this.lines.splice(row, 0, this.blankLine());
    }

    if (this.scrollTop !== 0) {
        if (this.ybase !== 0) {
            this.ybase--;
            this.ydisp = this.ybase;
        }
        this.lines.splice(this.ybase + this.scrollTop, 1);
    }

    // this.maxRange();
    this.updateRange(this.scrollTop);
    this.updateRange(this.scrollBottom);
};

Terminal.prototype.scrollDisp = function(disp) {
    this.ydisp += disp;

    if (this.ydisp > this.ybase) {
        this.ydisp = this.ybase;
    } else if (this.ydisp < 0) {
        this.ydisp = 0;
    }

    this.refresh(0, this.rows - 1);
};

Terminal.prototype.write = function(data) {
    var l = data.length,
        i = 0,
        cs, ch;

    this.refreshStart = this.y;
    this.refreshEnd = this.y;

    if (this.ybase !== this.ydisp) {
        this.ydisp = this.ybase;
        this.maxRange();
    }

    // this.log(JSON.stringify(data.replace(/\x1b/g, '^[')));

    for (; i < l; i++) {
        ch = data[i];
        switch (this.state) {
        case normal:
            switch (ch) {
                // '\0'
                // case '\0':
                // break;

                // '\a'
            case '\x07':
                this.bell();
                break;

                // '\n', '\v', '\f'
            case '\n':
            case '\x0b':
            case '\x0c':
                if (this.convertEol) {
                    this.x = 0;
                }
                this.y++;
                if (this.y > this.scrollBottom) {
                    this.y--;
                    this.scroll();
                }
                break;

                // '\r'
            case '\r':
                this.x = 0;
                break;

                // '\b'
            case '\x08':
                if (this.x > 0) {
                    this.x--;
                }
                break;

                // '\t'
            case '\t':
                this.x = this.nextStop();
                break;

                // shift out
            case '\x0e':
                this.setgLevel(1);
                break;

                // shift in
            case '\x0f':
                this.setgLevel(0);
                break;

                // '\e'
            case '\x1b':
                this.state = escaped;
                break;

            default:
                // ' '
                if (ch >= ' ') {
                    if (this.charset && this.charset[ch]) {
                        ch = this.charset[ch];
                    }
                    if (this.x >= this.cols) {
                        this.x = 0;
                        this.y++;
                        if (this.y > this.scrollBottom) {
                            this.y--;
                            this.scroll();
                        }
                    }
                    this.lines[this.y + this.ybase][this.x] = [this.curAttr, ch];
                    this.x++;
                    this.updateRange(this.y);
                }
                break;
            }
            break;
        case escaped:
            switch (ch) {
                // ESC [ Control Sequence Introducer ( CSI is 0x9b).
            case '[':
                this.params = [];
                this.currentParam = 0;
                this.state = csi;
                break;

                // ESC ] Operating System Command ( OSC is 0x9d).
            case ']':
                this.params = [];
                this.currentParam = 0;
                this.state = osc;
                break;

                // ESC P Device Control String ( DCS is 0x90).
            case 'P':
                this.params = [];
                this.currentParam = 0;
                this.state = dcs;
                break;

                // ESC _ Application Program Command ( APC is 0x9f).
            case '_':
                this.stateType = 'apc';
                this.state = ignore;
                break;

                // ESC ^ Privacy Message ( PM is 0x9e).
            case '^':
                this.stateType = 'pm';
                this.state = ignore;
                break;

                // ESC c Full Reset (RIS).
            case 'c':
                this.reset();
                break;

                // ESC E Next Line ( NEL is 0x85).
                // ESC D Index ( IND is 0x84).
            case 'E':
                this.x = 0;;
            case 'D':
                this.index();
                break;

                // ESC M Reverse Index ( RI is 0x8d).
            case 'M':
                this.reverseIndex();
                break;

                // ESC % Select default/utf-8 character set.
                // @ = default, G = utf-8
            case '%':
                //this.charset = null;
                this.setgLevel(0);
                this.setgCharset(0, Terminal.charsets.US);
                this.state = normal;
                i++;
                break;

                // ESC (,),*,+,-,. Designate G0-G2 Character Set.
            case '(':
                // <-- this seems to get all the attention
            case ')':
            case '*':
            case '+':
            case '-':
            case '.':
                switch (ch) {
                case '(':
                    this.gcharset = 0;
                    break;
                case ')':
                    this.gcharset = 1;
                    break;
                case '*':
                    this.gcharset = 2;
                    break;
                case '+':
                    this.gcharset = 3;
                    break;
                case '-':
                    this.gcharset = 1;
                    break;
                case '.':
                    this.gcharset = 2;
                    break;
                }
                this.state = charset;
                break;

                // Designate G3 Character Set (VT300).
                // A = ISO Latin-1 Supplemental.
                // Not implemented.
            case '/':
                this.gcharset = 3;
                this.state = charset;
                i--;
                break;

                // ESC N
                // Single Shift Select of G2 Character Set
                // ( SS2 is 0x8e). This affects next character only.
            case 'N':
                break;
                // ESC O
                // Single Shift Select of G3 Character Set
                // ( SS3 is 0x8f). This affects next character only.
            case 'O':
                break;
                // ESC n
                // Invoke the G2 Character Set as GL (LS2).
            case 'n':
                this.setgLevel(2);
                break;
                // ESC o
                // Invoke the G3 Character Set as GL (LS3).
            case 'o':
                this.setgLevel(3);
                break;
                // ESC |
                // Invoke the G3 Character Set as GR (LS3R).
            case '|':
                this.setgLevel(3);
                break;
                // ESC }
                // Invoke the G2 Character Set as GR (LS2R).
            case '}':
                this.setgLevel(2);
                break;
                // ESC ~
                // Invoke the G1 Character Set as GR (LS1R).
            case '~':
                this.setgLevel(1);
                break;

                // ESC 7 Save Cursor (DECSC).
            case '7':
                this.saveCursor();
                this.state = normal;
                break;

                // ESC 8 Restore Cursor (DECRC).
            case '8':
                this.restoreCursor();
                this.state = normal;
                break;

                // ESC # 3 DEC line height/width
            case '#':
                this.state = normal;
                i++;
                break;

                // ESC H Tab Set (HTS is 0x88).
            case 'H':
                this.tabSet();
                break;

                // ESC = Application Keypad (DECPAM).
            case '=':
                this.log('Serial port requested application keypad.');
                this.applicationKeypad = true;
                this.state = normal;
                break;

                // ESC > Normal Keypad (DECPNM).
            case '>':
                this.log('Switching back to normal keypad.');
                this.applicationKeypad = false;
                this.state = normal;
                break;

            default:
                this.state = normal;
                this.error('Unknown ESC control: %s.', ch);
                break;
            }
            break;

        case charset:
            switch (ch) {
            case '0':
                // DEC Special Character and Line Drawing Set.
                cs = Terminal.charsets.SCLD;
                break;
            case 'A':
                // UK
                cs = Terminal.charsets.UK;
                break;
            case 'B':
                // United States (USASCII).
                cs = Terminal.charsets.US;
                break;
            case '4':
                // Dutch
                cs = Terminal.charsets.Dutch;
                break;
            case 'C':
                // Finnish
            case '5':
                cs = Terminal.charsets.Finnish;
                break;
            case 'R':
                // French
                cs = Terminal.charsets.French;
                break;
            case 'Q':
                // FrenchCanadian
                cs = Terminal.charsets.FrenchCanadian;
                break;
            case 'K':
                // German
                cs = Terminal.charsets.German;
                break;
            case 'Y':
                // Italian
                cs = Terminal.charsets.Italian;
                break;
            case 'E':
                // NorwegianDanish
            case '6':
                cs = Terminal.charsets.NorwegianDanish;
                break;
            case 'Z':
                // Spanish
                cs = Terminal.charsets.Spanish;
                break;
            case 'H':
                // Swedish
            case '7':
                cs = Terminal.charsets.Swedish;
                break;
            case '=':
                // Swiss
                cs = Terminal.charsets.Swiss;
                break;
            case '/':
                // ISOLatin (actually /A)
                cs = Terminal.charsets.ISOLatin;
                i++;
                break;
            default:
                // Default
                cs = Terminal.charsets.US;
                break;
            }
            this.setgCharset(this.gcharset, cs);
            this.gcharset = null;
            this.state = normal;
            break;

        case osc:
            // OSC Ps ; Pt ST
            // OSC Ps ; Pt BEL
            // Set Text Parameters.
            if (ch === '\x1b' || ch === '\x07') {
                if (ch === '\x1b') i++;

                this.params.push(this.currentParam);

                switch (this.params[0]) {
                case 0:
                case 1:
                case 2:
                    if (this.params[1]) {
                        this.title = this.params[1];
                        this.handleTitle(this.title);
                    }
                    break;
                case 3:
                    // set X property
                    break;
                case 4:
                case 5:
                    // change dynamic colors
                    break;
                case 10:
                case 11:
                case 12:
                case 13:
                case 14:
                case 15:
                case 16:
                case 17:
                case 18:
                case 19:
                    // change dynamic ui colors
                    break;
                case 46:
                    // change log file
                    break;
                case 50:
                    // dynamic font
                    break;
                case 51:
                    // emacs shell
                    break;
                case 52:
                    // manipulate selection data
                    break;
                case 104:
                case 105:
                case 110:
                case 111:
                case 112:
                case 113:
                case 114:
                case 115:
                case 116:
                case 117:
                case 118:
                    // reset colors
                    break;
                }

                this.params = [];
                this.currentParam = 0;
                this.state = normal;
            } else {
                if (!this.params.length) {
                    if (ch >= '0' && ch <= '9') {
                        this.currentParam = this.currentParam * 10 + ch.charCodeAt(0) - 48;
                    } else if (ch === ';') {
                        this.params.push(this.currentParam);
                        this.currentParam = '';
                    }
                } else {
                    this.currentParam += ch;
                }
            }
            break;

        case csi:
            // '?', '>', '!'
            if (ch === '?' || ch === '>' || ch === '!') {
                this.prefix = ch;
                break;
            }

            // 0 - 9
            if (ch >= '0' && ch <= '9') {
                this.currentParam = this.currentParam * 10 + ch.charCodeAt(0) - 48;
                break;
            }

            // '$', '"', ' ', '\''
            if (ch === '$' || ch === '"' || ch === ' ' || ch === '\'') {
                this.postfix = ch;
                break;
            }

            this.params.push(this.currentParam);
            this.currentParam = 0;

            // ';'
            if (ch === ';') break;

            this.state = normal;

            switch (ch) {
                // CSI Ps A
                // Cursor Up Ps Times (default = 1) (CUU).
            case 'A':
                this.cursorUp(this.params);
                break;

                // CSI Ps B
                // Cursor Down Ps Times (default = 1) (CUD).
            case 'B':
                this.cursorDown(this.params);
                break;

                // CSI Ps C
                // Cursor Forward Ps Times (default = 1) (CUF).
            case 'C':
                this.cursorForward(this.params);
                break;

                // CSI Ps D
                // Cursor Backward Ps Times (default = 1) (CUB).
            case 'D':
                this.cursorBackward(this.params);
                break;

                // CSI Ps ; Ps H
                // Cursor Position [row;column] (default = [1,1]) (CUP).
            case 'H':
                this.cursorPos(this.params);
                break;

                // CSI Ps J Erase in Display (ED).
            case 'J':
                this.eraseInDisplay(this.params);
                break;

                // CSI Ps K Erase in Line (EL).
            case 'K':
                this.eraseInLine(this.params);
                break;

                // CSI Pm m Character Attributes (SGR).
            case 'm':
                this.charAttributes(this.params);
                break;

                // CSI Ps n Device Status Report (DSR).
            case 'n':
                this.deviceStatus(this.params);
                break;

                /**
                 * Additions
                 */

                // CSI Ps @
                // Insert Ps (Blank) Character(s) (default = 1) (ICH).
            case '@':
                this.insertChars(this.params);
                break;

                // CSI Ps E
                // Cursor Next Line Ps Times (default = 1) (CNL).
            case 'E':
                this.cursorNextLine(this.params);
                break;

                // CSI Ps F
                // Cursor Preceding Line Ps Times (default = 1) (CNL).
            case 'F':
                this.cursorPrecedingLine(this.params);
                break;

                // CSI Ps G
                // Cursor Character Absolute [column] (default = [row,1]) (CHA).
            case 'G':
                this.cursorCharAbsolute(this.params);
                break;

                // CSI Ps L
                // Insert Ps Line(s) (default = 1) (IL).
            case 'L':
                this.insertLines(this.params);
                break;

                // CSI Ps M
                // Delete Ps Line(s) (default = 1) (DL).
            case 'M':
                this.deleteLines(this.params);
                break;

                // CSI Ps P
                // Delete Ps Character(s) (default = 1) (DCH).
            case 'P':
                this.deleteChars(this.params);
                break;

                // CSI Ps X
                // Erase Ps Character(s) (default = 1) (ECH).
            case 'X':
                this.eraseChars(this.params);
                break;

                // CSI Pm ` Character Position Absolute
                // [column] (default = [row,1]) (HPA).
            case '`':
                this.charPosAbsolute(this.params);
                break;

                // 141 61 a * HPR -
                // Horizontal Position Relative
            case 'a':
                this.HPositionRelative(this.params);
                break;

                // CSI P s c
                // Send Device Attributes (Primary DA).
                // CSI > P s c
                // Send Device Attributes (Secondary DA)
            case 'c':
                this.sendDeviceAttributes(this.params);
                break;

                // CSI Pm d
                // Line Position Absolute [row] (default = [1,column]) (VPA).
            case 'd':
                this.linePosAbsolute(this.params);
                break;

                // 145 65 e * VPR - Vertical Position Relative
            case 'e':
                this.VPositionRelative(this.params);
                break;

                // CSI Ps ; Ps f
                // Horizontal and Vertical Position [row;column] (default =
                // [1,1]) (HVP).
            case 'f':
                this.HVPosition(this.params);
                break;

                // CSI Pm h Set Mode (SM).
                // CSI ? Pm h - mouse escape codes, cursor escape codes
            case 'h':
                this.setMode(this.params);
                break;

                // CSI Pm l Reset Mode (RM).
                // CSI ? Pm l
            case 'l':
                this.resetMode(this.params);
                break;

                // CSI Ps ; Ps r
                // Set Scrolling Region [top;bottom] (default = full size of win-
                // dow) (DECSTBM).
                // CSI ? Pm r
            case 'r':
                this.setScrollRegion(this.params);
                break;

                // CSI s
                // Save cursor (ANSI.SYS).
            case 's':
                this.saveCursor(this.params);
                break;

                // CSI u
                // Restore cursor (ANSI.SYS).
            case 'u':
                this.restoreCursor(this.params);
                break;

                /**
                 * Lesser Used
                 */

                // CSI Ps I
                // Cursor Forward Tabulation Ps tab stops (default = 1) (CHT).
            case 'I':
                this.cursorForwardTab(this.params);
                break;

                // CSI Ps S Scroll up Ps lines (default = 1) (SU).
            case 'S':
                this.scrollUp(this.params);
                break;

                // CSI Ps T Scroll down Ps lines (default = 1) (SD).
                // CSI Ps ; Ps ; Ps ; Ps ; Ps T
                // CSI > Ps; Ps T
            case 'T':
                if (this.params.length < 2 && !this.prefix) {
                    this.scrollDown(this.params);
                }
                break;

                // CSI Ps Z
                // Cursor Backward Tabulation Ps tab stops (default = 1) (CBT).
            case 'Z':
                this.cursorBackwardTab(this.params);
                break;

                // CSI Ps b Repeat the preceding graphic character Ps times (REP).
            case 'b':
                this.repeatPrecedingCharacter(this.params);
                break;

                // CSI Ps g Tab Clear (TBC).
            case 'g':
                this.tabClear(this.params);
                break;
            case 'p':
                switch (this.prefix) {
                case '!':
                    this.softReset(this.params);
                    break;
                }
                break;

            default:
                this.error('Unknown CSI code: %s.', ch);
                break;
            }

            this.prefix = '';
            this.postfix = '';
            break;

        case dcs:
            if (ch === '\x1b' || ch === '\x07') {
                if (ch === '\x1b') i++;

                switch (this.prefix) {
                    // User-Defined Keys (DECUDK).
                case '':
                    break;

                    // Request Status String (DECRQSS).
                    // test: echo -e '\eP$q"p\e\\'
                case '$q':
                    var pt = this.currentParam,
                        valid = false;

                    switch (pt) {
                        // DECSCA
                    case '"q':
                        pt = '0"q';
                        break;

                        // DECSCL
                    case '"p':
                        pt = '61"p';
                        break;

                        // DECSTBM
                    case 'r':
                        pt = '' + (this.scrollTop + 1) + ';' + (this.scrollBottom + 1) + 'r';
                        break;

                        // SGR
                    case 'm':
                        pt = '0m';
                        break;

                    default:
                        this.error('Unknown DCS Pt: %s.', pt);
                        pt = '';
                        break;
                    }

                    this.send('\x1bP' + +valid + '$r' + pt + '\x1b\\');
                    break;

                    // Set Termcap/Terminfo Data (xterm, experimental).
                case '+p':
                    break;

                default:
                    this.error('Unknown DCS prefix: %s.', this.prefix);
                    break;
                }

                this.currentParam = 0;
                this.prefix = '';
                this.state = normal;
            } else if (!this.currentParam) {
                if (!this.prefix && ch !== '$' && ch !== '+') {
                    this.currentParam = ch;
                } else if (this.prefix.length === 2) {
                    this.currentParam = ch;
                } else {
                    this.prefix += ch;
                }
            } else {
                this.currentParam += ch;
            }
            break;

        case ignore:
            // For PM and APC.
            if (ch === '\x1b' || ch === '\x07') {
                if (ch === '\x1b') i++;
                this.emit(this.stateType, this.stateData || '');
                this.stateData = '';
                this.state = normal;
            } else {
                if (!this.stateData) this.stateData = '';
                this.stateData += ch;
            }
            break;
        }
    }

    this.updateRange(this.y);
    this.refresh(this.refreshStart, this.refreshEnd);
};

Terminal.prototype.writeln = function(data) {
    // properly render empty lines
    if (!data.trim().length) data = '&nbsp;';
    data = data
      .replace('\t', this.tabspace)
      .replace(/ /g, '&nbsp;')
      ;
    this.write(data + '\r\n');
};

Terminal.prototype.keyDown = function(ev) {
    var key;

    switch (ev.keyCode) {
        // backspace
    case 8:
        if (ev.shiftKey) {
            key = '\x08'; // ^H
            break;
        }
        key = '\x7f'; // ^?
        break;
        // tab
    case 9:
        if (ev.shiftKey) {
            key = '\x1b[Z';
            break;
        }
        key = '\t';
        break;
        // return/enter
    case 13:
        key = '\r';
        break;
        // escape
    case 27:
        key = '\x1b';
        break;
        // left-arrow
    case 37:
        if (this.applicationKeypad) {
            key = '\x1bOD'; // SS3 as ^[O for 7-bit
            //key = '\x8fD'; // SS3 as 0x8f for 8-bit
            break;
        }
        key = '\x1b[D';
        break;
        // right-arrow
    case 39:
        if (this.applicationKeypad) {
            key = '\x1bOC';
            break;
        }
        key = '\x1b[C';
        break;
        // up-arrow
    case 38:
        if (this.applicationKeypad) {
            key = '\x1bOA';
            break;
        }
        if (ev.ctrlKey) {
            this.scrollDisp(-1);
            return cancel(ev);
        } else {
            key = '\x1b[A';
        }
        break;
        // down-arrow
    case 40:
        if (this.applicationKeypad) {
            key = '\x1bOB';
            break;
        }
        if (ev.ctrlKey) {
            this.scrollDisp(1);
            return cancel(ev);
        } else {
            key = '\x1b[B';
        }
        break;
        // delete
    case 46:
        key = '\x1b[3~';
        break;
        // insert
    case 45:
        key = '\x1b[2~';
        break;
        // home
    case 36:
        if (this.applicationKeypad) {
            key = '\x1bOH';
            break;
        }
        key = '\x1bOH';
        break;
        // end
    case 35:
        if (this.applicationKeypad) {
            key = '\x1bOF';
            break;
        }
        key = '\x1bOF';
        break;
        // page up
    case 33:
        if (ev.shiftKey) {
            this.scrollDisp(-(this.rows - 1));
            return cancel(ev);
        } else {
            key = '\x1b[5~';
        }
        break;
        // page down
    case 34:
        if (ev.shiftKey) {
            this.scrollDisp(this.rows - 1);
            return cancel(ev);
        } else {
            key = '\x1b[6~';
        }
        break;
        // F1
    case 112:
        key = '\x1bOP';
        break;
        // F2
    case 113:
        key = '\x1bOQ';
        break;
        // F3
    case 114:
        key = '\x1bOR';
        break;
        // F4
    case 115:
        key = '\x1bOS';
        break;
        // F5
    case 116:
        key = '\x1b[15~';
        break;
        // F6
    case 117:
        key = '\x1b[17~';
        break;
        // F7
    case 118:
        key = '\x1b[18~';
        break;
        // F8
    case 119:
        key = '\x1b[19~';
        break;
        // F9
    case 120:
        key = '\x1b[20~';
        break;
        // F10
    case 121:
        key = '\x1b[21~';
        break;
        // F11
    case 122:
        key = '\x1b[23~';
        break;
        // F12
    case 123:
        key = '\x1b[24~';
        break;
    default:
        // a-z and space
        if (ev.ctrlKey) {
            if (ev.keyCode >= 65 && ev.keyCode <= 90) {
                key = String.fromCharCode(ev.keyCode - 64);
            } else if (ev.keyCode === 32) {
                // NUL
                key = String.fromCharCode(0);
            } else if (ev.keyCode >= 51 && ev.keyCode <= 55) {
                // escape, file sep, group sep, record sep, unit sep
                key = String.fromCharCode(ev.keyCode - 51 + 27);
            } else if (ev.keyCode === 56) {
                // delete
                key = String.fromCharCode(127);
            } else if (ev.keyCode === 219) {
                // ^[ - escape
                key = String.fromCharCode(27);
            } else if (ev.keyCode === 221) {
                // ^] - group sep
                key = String.fromCharCode(29);
            }
        } else if ((!isMac && ev.altKey) || (isMac && ev.metaKey)) {
            if (ev.keyCode >= 65 && ev.keyCode <= 90) {
                key = '\x1b' + String.fromCharCode(ev.keyCode + 32);
            } else if (ev.keyCode === 192) {
                key = '\x1b`';
            } else if (ev.keyCode >= 48 && ev.keyCode <= 57) {
                key = '\x1b' + (ev.keyCode - 48);
            }
        }
        break;
    }

    this.emit('keydown', ev);

    if (key) {
        this.emit('key', key, ev);

        this.showCursor();
        this.handler(key);

        return cancel(ev);
    }

    return true;
};

Terminal.prototype.setgLevel = function(g) {
    this.glevel = g;
    this.charset = this.charsets[g];
};

Terminal.prototype.setgCharset = function(g, charset) {
    this.charsets[g] = charset;
    if (this.glevel === g) {
        this.charset = charset;
    }
};

Terminal.prototype.keyPress = function(ev) {
    var key;

    cancel(ev);

    if (ev.charCode) {
        key = ev.charCode;
    } else if (ev.which == null) {
        key = ev.keyCode;
    } else if (ev.which !== 0 && ev.charCode !== 0) {
        key = ev.which;
    } else {
        return false;
    }

    if (!key || ev.ctrlKey || ev.altKey || ev.metaKey) return false;

    key = String.fromCharCode(key);

    this.emit('keypress', key, ev);
    this.emit('key', key, ev);

    this.showCursor();
    this.handler(key);

    return false;
};

Terminal.prototype.send = function(data) {
    var self = this;

    if (!this.queue) {
        setTimeout(function() {
            self.handler(self.queue);
            self.queue = '';
        }, 1);
    }

    this.queue += data;
};

Terminal.prototype.bell = function() {
    if (!Terminal.visualBell) return;
    var self = this;
    this.element.style.borderColor = 'white';
    setTimeout(function() {
        self.element.style.borderColor = '';
    }, 10);
    if (Terminal.popOnBell) this.focus();
};

Terminal.prototype.log = function() {
    if (!Terminal.debug) return;
    if (!window.console || !window.console.log) return;
    var args = Array.prototype.slice.call(arguments);
    window.console.log.apply(window.console, args);
};

Terminal.prototype.error = function() {
    if (!Terminal.debug) return;
    if (!window.console || !window.console.error) return;
    var args = Array.prototype.slice.call(arguments);
    window.console.error.apply(window.console, args);
};

Terminal.prototype.resize = function(x, y) {
    var line, el, i, j, ch;

    if (x < 1) x = 1;
    if (y < 1) y = 1;

    // resize cols
    j = this.cols;
    if (j < x) {
        ch = [this.defAttr, ' '];
        i = this.lines.length;
        while (i--) {
            while (this.lines[i].length < x) {
                this.lines[i].push(ch);
            }
        }
    } else if (j > x) {
        i = this.lines.length;
        while (i--) {
            while (this.lines[i].length > x) {
                this.lines[i].pop();
            }
        }
    }
    this.setupStops(j);
    this.cols = x;

    // resize rows
    j = this.rows;
    if (j < y) {
        el = this.element;
        while (j++ < y) {
            if (this.lines.length < y + this.ybase) {
                this.lines.push(this.blankLine());
            }
            if (this.children.length < y) {
                line = document.createElement('div');
                el.appendChild(line);
                this.children.push(line);
            }
        }
    } else if (j > y) {
        while (j-- > y) {
            if (this.lines.length > y + this.ybase) {
                this.lines.pop();
            }
            if (this.children.length > y) {
                el = this.children.pop();
                if (!el) continue;
                el.parentNode.removeChild(el);
            }
        }
    }
    this.rows = y;

    // make sure the cursor stays on screen
    if (this.y >= y) this.y = y - 1;
    if (this.x >= x) this.x = x - 1;

    this.scrollTop = 0;
    this.scrollBottom = y - 1;

    this.refresh(0, this.rows - 1);

    // it's a real nightmare trying
    // to resize the original
    // screen buffer. just set it
    // to null for now.
    this.normal = null;
};

Terminal.prototype.updateRange = function(y) {
    if (y < this.refreshStart) this.refreshStart = y;
    if (y > this.refreshEnd) this.refreshEnd = y;
};

Terminal.prototype.maxRange = function() {
    this.refreshStart = 0;
    this.refreshEnd = this.rows - 1;
};

Terminal.prototype.setupStops = function(i) {
    if (i != null) {
        if (!this.tabs[i]) {
            i = this.prevStop(i);
        }
    } else {
        this.tabs = {};
        i = 0;
    }

    for (; i < this.cols; i += 8) {
        this.tabs[i] = true;
    }
};

Terminal.prototype.prevStop = function(x) {
    if (x == null) x = this.x;
    while (!this.tabs[--x] && x > 0);
    return x >= this.cols ? this.cols - 1 : x < 0 ? 0 : x;
};

Terminal.prototype.nextStop = function(x) {
    if (x == null) x = this.x;
    while (!this.tabs[++x] && x < this.cols);
    return x >= this.cols ? this.cols - 1 : x < 0 ? 0 : x;
};

Terminal.prototype.eraseRight = function(x, y) {
    var line = this.lines[this.ybase + y],
        ch = [this.curAttr, ' ']; // xterm

    for (; x < this.cols; x++) {
        line[x] = ch;
    }

    this.updateRange(y);
};

Terminal.prototype.eraseLeft = function(x, y) {
    var line = this.lines[this.ybase + y],
        ch = [this.curAttr, ' ']; // xterm

    x++;
    while (x--) line[x] = ch;

    this.updateRange(y);
};

Terminal.prototype.eraseLine = function(y) {
    this.eraseRight(0, y);
};

Terminal.prototype.blankLine = function(cur) {
    var attr = cur ? this.curAttr : this.defAttr;

    var ch = [attr, ' '],
        line = [],
        i = 0;

    for (; i < this.cols; i++) {
        line[i] = ch;
    }

    return line;
};

Terminal.prototype.ch = function(cur) {
    return cur ? [this.curAttr, ' '] : [this.defAttr, ' '];
};

Terminal.prototype.is = function(term) {
    var name = this.termName || Terminal.termName;
    return (name + '')
        .indexOf(term) === 0;
};

Terminal.prototype.handler = function(data) {
    this.emit('data', data);
};

Terminal.prototype.handleTitle = function(title) {
    this.emit('title', title);
};

/**
* ESC
*/

// ESC D Index (IND is 0x84).
Terminal.prototype.index = function() {
    this.y++;
    if (this.y > this.scrollBottom) {
        this.y--;
        this.scroll();
    }
    this.state = normal;
};

// ESC M Reverse Index (RI is 0x8d).
Terminal.prototype.reverseIndex = function() {
    var j;
    this.y--;
    if (this.y < this.scrollTop) {
        this.y++;
        // possibly move the code below to term.reverseScroll();
        // test: echo -ne '\e[1;1H\e[44m\eM\e[0m'
        // blankLine(true) is xterm/linux behavior
        this.lines.splice(this.y + this.ybase, 0, this.blankLine(true));
        j = this.rows - 1 - this.scrollBottom;
        this.lines.splice(this.rows - 1 + this.ybase - j + 1, 1);
        // this.maxRange();
        this.updateRange(this.scrollTop);
        this.updateRange(this.scrollBottom);
    }
    this.state = normal;
};

// ESC c Full Reset (RIS).
Terminal.prototype.reset = function() {
    Terminal.call(this, this.cols, this.rows);
    this.refresh(0, this.rows - 1);
};

// ESC H Tab Set (HTS is 0x88).
Terminal.prototype.tabSet = function() {
    this.tabs[this.x] = true;
    this.state = normal;
};

/**
* CSI
*/

// CSI Ps A
// Cursor Up Ps Times (default = 1) (CUU).
Terminal.prototype.cursorUp = function(params) {
    var param = params[0];
    if (param < 1) param = 1;
    this.y -= param;
    if (this.y < 0) this.y = 0;
};

// CSI Ps B
// Cursor Down Ps Times (default = 1) (CUD).
Terminal.prototype.cursorDown = function(params) {
    var param = params[0];
    if (param < 1) param = 1;
    this.y += param;
    if (this.y >= this.rows) {
        this.y = this.rows - 1;
    }
};

// CSI Ps C
// Cursor Forward Ps Times (default = 1) (CUF).
Terminal.prototype.cursorForward = function(params) {
    var param = params[0];
    if (param < 1) param = 1;
    this.x += param;
    if (this.x >= this.cols) {
        this.x = this.cols - 1;
    }
};

// CSI Ps D
// Cursor Backward Ps Times (default = 1) (CUB).
Terminal.prototype.cursorBackward = function(params) {
    var param = params[0];
    if (param < 1) param = 1;
    this.x -= param;
    if (this.x < 0) this.x = 0;
};

// CSI Ps ; Ps H
// Cursor Position [row;column] (default = [1,1]) (CUP).
Terminal.prototype.cursorPos = function(params) {
    var row, col;

    row = params[0] - 1;

    if (params.length >= 2) {
        col = params[1] - 1;
    } else {
        col = 0;
    }

    if (row < 0) {
        row = 0;
    } else if (row >= this.rows) {
        row = this.rows - 1;
    }

    if (col < 0) {
        col = 0;
    } else if (col >= this.cols) {
        col = this.cols - 1;
    }

    this.x = col;
    this.y = row;
};

// CSI Ps J Erase in Display (ED).
// Ps = 0 -> Erase Below (default).
// Ps = 1 -> Erase Above.
// Ps = 2 -> Erase All.
// Ps = 3 -> Erase Saved Lines (xterm).
// CSI ? Ps J
// Erase in Display (DECSED).
// Ps = 0 -> Selective Erase Below (default).
// Ps = 1 -> Selective Erase Above.
// Ps = 2 -> Selective Erase All.
Terminal.prototype.eraseInDisplay = function(params) {
    var j;
    switch (params[0]) {
    case 0:
        this.eraseRight(this.x, this.y);
        j = this.y + 1;
        for (; j < this.rows; j++) {
            this.eraseLine(j);
        }
        break;
    case 1:
        this.eraseLeft(this.x, this.y);
        j = this.y;
        while (j--) {
            this.eraseLine(j);
        }
        break;
    case 2:
        j = this.rows;
        while (j--) this.eraseLine(j);
        break;
    case 3:
        ; // no saved lines
        break;
    }
    this.emit('erase', {
        0: 'below',
        1: 'above',
        2: 'all',
        3: 'saved'
    }[params]);
};

// CSI Ps K Erase in Line (EL).
// Ps = 0 -> Erase to Right (default).
// Ps = 1 -> Erase to Left.
// Ps = 2 -> Erase All.
// CSI ? Ps K
// Erase in Line (DECSEL).
// Ps = 0 -> Selective Erase to Right (default).
// Ps = 1 -> Selective Erase to Left.
// Ps = 2 -> Selective Erase All.
Terminal.prototype.eraseInLine = function(params) {
    switch (params[0]) {
    case 0:
        this.eraseRight(this.x, this.y);
        break;
    case 1:
        this.eraseLeft(this.x, this.y);
        break;
    case 2:
        this.eraseLine(this.y);
        break;
    }
};

// CSI Pm m Character Attributes (SGR).
// Ps = 0 -> Normal (default).
// Ps = 1 -> Bold.
// Ps = 4 -> Underlined.
// Ps = 5 -> Blink (appears as Bold).
// Ps = 7 -> Inverse.
// Ps = 8 -> Invisible, i.e., hidden (VT300).
// Ps = 2 2 -> Normal (neither bold nor faint).
// Ps = 2 4 -> Not underlined.
// Ps = 2 5 -> Steady (not blinking).
// Ps = 2 7 -> Positive (not inverse).
// Ps = 2 8 -> Visible, i.e., not hidden (VT300).
// Ps = 3 0 -> Set foreground color to Black.
// Ps = 3 1 -> Set foreground color to Red.
// Ps = 3 2 -> Set foreground color to Green.
// Ps = 3 3 -> Set foreground color to Yellow.
// Ps = 3 4 -> Set foreground color to Blue.
// Ps = 3 5 -> Set foreground color to Magenta.
// Ps = 3 6 -> Set foreground color to Cyan.
// Ps = 3 7 -> Set foreground color to White.
// Ps = 3 9 -> Set foreground color to default (original).
// Ps = 4 0 -> Set background color to Black.
// Ps = 4 1 -> Set background color to Red.
// Ps = 4 2 -> Set background color to Green.
// Ps = 4 3 -> Set background color to Yellow.
// Ps = 4 4 -> Set background color to Blue.
// Ps = 4 5 -> Set background color to Magenta.
// Ps = 4 6 -> Set background color to Cyan.
// Ps = 4 7 -> Set background color to White.
// Ps = 4 9 -> Set background color to default (original).

// If 16-color support is compiled, the following apply. Assume
// that xterm's resources are set so that the ISO color codes are
// the first 8 of a set of 16. Then the aixterm colors are the
// bright versions of the ISO colors:
// Ps = 9 0 -> Set foreground color to Black.
// Ps = 9 1 -> Set foreground color to Red.
// Ps = 9 2 -> Set foreground color to Green.
// Ps = 9 3 -> Set foreground color to Yellow.
// Ps = 9 4 -> Set foreground color to Blue.
// Ps = 9 5 -> Set foreground color to Magenta.
// Ps = 9 6 -> Set foreground color to Cyan.
// Ps = 9 7 -> Set foreground color to White.
// Ps = 1 0 0 -> Set background color to Black.
// Ps = 1 0 1 -> Set background color to Red.
// Ps = 1 0 2 -> Set background color to Green.
// Ps = 1 0 3 -> Set background color to Yellow.
// Ps = 1 0 4 -> Set background color to Blue.
// Ps = 1 0 5 -> Set background color to Magenta.
// Ps = 1 0 6 -> Set background color to Cyan.
// Ps = 1 0 7 -> Set background color to White.

// If xterm is compiled with the 16-color support disabled, it
// supports the following, from rxvt:
// Ps = 1 0 0 -> Set foreground and background color to
// default.

// If 88- or 256-color support is compiled, the following apply.
// Ps = 3 8 ; 5 ; Ps -> Set foreground color to the second
// Ps.
// Ps = 4 8 ; 5 ; Ps -> Set background color to the second
// Ps.
Terminal.prototype.charAttributes = function(params) {
    var l = params.length,
        i = 0,
        bg, fg, p;

    for (; i < l; i++) {
        p = params[i];
        if (p >= 30 && p <= 37) {
            // fg color 8
            this.curAttr = (this.curAttr & ~ (0x1ff << 9)) | ((p - 30) << 9);
        } else if (p >= 40 && p <= 47) {
            // bg color 8
            this.curAttr = (this.curAttr & ~0x1ff) | (p - 40);
        } else if (p >= 90 && p <= 97) {
            // fg color 16
            p += 8;
            this.curAttr = (this.curAttr & ~ (0x1ff << 9)) | ((p - 90) << 9);
        } else if (p >= 100 && p <= 107) {
            // bg color 16
            p += 8;
            this.curAttr = (this.curAttr & ~0x1ff) | (p - 100);
        } else if (p === 0) {
            // default
            this.curAttr = this.defAttr;
        } else if (p === 1) {
            // bold text
            this.curAttr = this.curAttr | (1 << 18);
        } else if (p === 4) {
            // underlined text
            this.curAttr = this.curAttr | (2 << 18);
        } else if (p === 7 || p === 27) {
            // inverse and positive
            // test with: echo -e '\e[31m\e[42mhello\e[7mworld\e[27mhi\e[m'
            if (p === 7) {
                if ((this.curAttr >> 18) & 4) continue;
                this.curAttr = this.curAttr | (4 << 18);
            } else if (p === 27) {
                if (~ (this.curAttr >> 18) & 4) continue;
                this.curAttr = this.curAttr & ~ (4 << 18);
            }

            bg = this.curAttr & 0x1ff;
            fg = (this.curAttr >> 9) & 0x1ff;

            this.curAttr = (this.curAttr & ~0x3ffff) | ((bg << 9) | fg);
        } else if (p === 22) {
            // not bold
            this.curAttr = this.curAttr & ~ (1 << 18);
        } else if (p === 24) {
            // not underlined
            this.curAttr = this.curAttr & ~ (2 << 18);
        } else if (p === 39) {
            // reset fg
            this.curAttr = this.curAttr & ~ (0x1ff << 9);
            this.curAttr = this.curAttr | (((this.defAttr >> 9) & 0x1ff) << 9);
        } else if (p === 49) {
            // reset bg
            this.curAttr = this.curAttr & ~0x1ff;
            this.curAttr = this.curAttr | (this.defAttr & 0x1ff);
        } else if (p === 38) {
            // fg color 256
            if (params[i + 1] !== 5) continue;
            i += 2;
            p = params[i] & 0xff;
            // convert 88 colors to 256
            // if (this.is('rxvt-unicode') && p < 88) p = p * 2.9090 | 0;
            this.curAttr = (this.curAttr & ~ (0x1ff << 9)) | (p << 9);
        } else if (p === 48) {
            // bg color 256
            if (params[i + 1] !== 5) continue;
            i += 2;
            p = params[i] & 0xff;
            // convert 88 colors to 256
            // if (this.is('rxvt-unicode') && p < 88) p = p * 2.9090 | 0;
            this.curAttr = (this.curAttr & ~0x1ff) | p;
        }
    }
};

// CSI Ps n Device Status Report (DSR).
// Ps = 5 -> Status Report. Result (``OK'') is
// CSI 0 n
// Ps = 6 -> Report Cursor Position (CPR) [row;column].
// Result is
// CSI r ; c R
// CSI ? Ps n
// Device Status Report (DSR, DEC-specific).
// Ps = 6 -> Report Cursor Position (CPR) [row;column] as CSI
// ? r ; c R (assumes page is zero).
// Ps = 1 5 -> Report Printer status as CSI ? 1 0 n (ready).
// or CSI ? 1 1 n (not ready).
// Ps = 2 5 -> Report UDK status as CSI ? 2 0 n (unlocked)
// or CSI ? 2 1 n (locked).
// Ps = 2 6 -> Report Keyboard status as
// CSI ? 2 7 ; 1 ; 0 ; 0 n (North American).
// The last two parameters apply to VT400 & up, and denote key-
// board ready and LK01 respectively.
// Ps = 5 3 -> Report Locator status as
// CSI ? 5 3 n Locator available, if compiled-in, or
// CSI ? 5 0 n No Locator, if not.
Terminal.prototype.deviceStatus = function(params) {
    if (!this.prefix) {
        switch (params[0]) {
        case 5:
            // status report
            this.send('\x1b[0n');
            break;
        case 6:
            // cursor position
            this.send('\x1b[' + (this.y + 1) + ';' + (this.x + 1) + 'R');
            break;
        }
    } else if (this.prefix === '?') {
        // modern xterm doesnt seem to
        // respond to any of these except ?6, 6, and 5
        switch (params[0]) {
        case 6:
            // cursor position
            this.send('\x1b[?' + (this.y + 1) + ';' + (this.x + 1) + 'R');
            break;
        case 15:
            // no printer
            // this.send('\x1b[?11n');
            break;
        case 25:
            // dont support user defined keys
            // this.send('\x1b[?21n');
            break;
        case 26:
            // north american keyboard
            // this.send('\x1b[?27;1;0;0n');
            break;
        case 53:
            // no dec locator/mouse
            // this.send('\x1b[?50n');
            break;
        }
    }
};

/**
* Additions
*/

// CSI Ps @
// Insert Ps (Blank) Character(s) (default = 1) (ICH).
Terminal.prototype.insertChars = function(params) {
    var param, row, j, ch;

    param = params[0];
    if (param < 1) param = 1;

    row = this.y + this.ybase;
    j = this.x;
    ch = [this.curAttr, ' ']; // xterm

    while (param-- && j < this.cols) {
        this.lines[row].splice(j++, 0, ch);
        this.lines[row].pop();
    }
};

// CSI Ps E
// Cursor Next Line Ps Times (default = 1) (CNL).
// same as CSI Ps B ?
Terminal.prototype.cursorNextLine = function(params) {
    var param = params[0];
    if (param < 1) param = 1;
    this.y += param;
    if (this.y >= this.rows) {
        this.y = this.rows - 1;
    }
    this.x = 0;
};

// CSI Ps F
// Cursor Preceding Line Ps Times (default = 1) (CNL).
// reuse CSI Ps A ?
Terminal.prototype.cursorPrecedingLine = function(params) {
    var param = params[0];
    if (param < 1) param = 1;
    this.y -= param;
    if (this.y < 0) this.y = 0;
    this.x = 0;
};

// CSI Ps G
// Cursor Character Absolute [column] (default = [row,1]) (CHA).
Terminal.prototype.cursorCharAbsolute = function(params) {
    var param = params[0];
    if (param < 1) param = 1;
    this.x = param - 1;
};

// CSI Ps L
// Insert Ps Line(s) (default = 1) (IL).
Terminal.prototype.insertLines = function(params) {
    var param, row, j;

    param = params[0];
    if (param < 1) param = 1;
    row = this.y + this.ybase;

    j = this.rows - 1 - this.scrollBottom;
    j = this.rows - 1 + this.ybase - j + 1;

    while (param--) {
        // test: echo -e '\e[44m\e[1L\e[0m'
        // blankLine(true) - xterm/linux behavior
        this.lines.splice(row, 0, this.blankLine(true));
        this.lines.splice(j, 1);
    }

    // this.maxRange();
    this.updateRange(this.y);
    this.updateRange(this.scrollBottom);
};

// CSI Ps M
// Delete Ps Line(s) (default = 1) (DL).
Terminal.prototype.deleteLines = function(params) {
    var param, row, j;

    param = params[0];
    if (param < 1) param = 1;
    row = this.y + this.ybase;

    j = this.rows - 1 - this.scrollBottom;
    j = this.rows - 1 + this.ybase - j;

    while (param--) {
        // test: echo -e '\e[44m\e[1M\e[0m'
        // blankLine(true) - xterm/linux behavior
        this.lines.splice(j + 1, 0, this.blankLine(true));
        this.lines.splice(row, 1);
    }

    // this.maxRange();
    this.updateRange(this.y);
    this.updateRange(this.scrollBottom);
};

// CSI Ps P
// Delete Ps Character(s) (default = 1) (DCH).
Terminal.prototype.deleteChars = function(params) {
    var param, row, ch;

    param = params[0];
    if (param < 1) param = 1;

    row = this.y + this.ybase;
    ch = [this.curAttr, ' ']; // xterm

    while (param--) {
        this.lines[row].splice(this.x, 1);
        this.lines[row].push(ch);
    }
};

// CSI Ps X
// Erase Ps Character(s) (default = 1) (ECH).
Terminal.prototype.eraseChars = function(params) {
    var param, row, j, ch;

    param = params[0];
    if (param < 1) param = 1;

    row = this.y + this.ybase;
    j = this.x;
    ch = [this.curAttr, ' ']; // xterm

    while (param-- && j < this.cols) {
        this.lines[row][j++] = ch;
    }
};

// CSI Pm ` Character Position Absolute
// [column] (default = [row,1]) (HPA).
Terminal.prototype.charPosAbsolute = function(params) {
    var param = params[0];
    if (param < 1) param = 1;
    this.x = param - 1;
    if (this.x >= this.cols) {
        this.x = this.cols - 1;
    }
};

// 141 61 a * HPR -
// Horizontal Position Relative
// reuse CSI Ps C ?
Terminal.prototype.HPositionRelative = function(params) {
    var param = params[0];
    if (param < 1) param = 1;
    this.x += param;
    if (this.x >= this.cols) {
        this.x = this.cols - 1;
    }
};

// CSI Ps c Send Device Attributes (Primary DA).
// Ps = 0 or omitted -> request attributes from terminal. The
// response depends on the decTerminalID resource setting.
// -> CSI ? 1 ; 2 c (``VT100 with Advanced Video Option'')
// -> CSI ? 1 ; 0 c (``VT101 with No Options'')
// -> CSI ? 6 c (``VT102'')
// -> CSI ? 6 0 ; 1 ; 2 ; 6 ; 8 ; 9 ; 1 5 ; c (``VT220'')
// The VT100-style response parameters do not mean anything by
// themselves. VT220 parameters do, telling the host what fea-
// tures the terminal supports:
// Ps = 1 -> 132-columns.
// Ps = 2 -> Printer.
// Ps = 6 -> Selective erase.
// Ps = 8 -> User-defined keys.
// Ps = 9 -> National replacement character sets.
// Ps = 1 5 -> Technical characters.
// Ps = 2 2 -> ANSI color, e.g., VT525.
// Ps = 2 9 -> ANSI text locator (i.e., DEC Locator mode).
// CSI > Ps c
// Send Device Attributes (Secondary DA).
// Ps = 0 or omitted -> request the terminal's identification
// code. The response depends on the decTerminalID resource set-
// ting. It should apply only to VT220 and up, but xterm extends
// this to VT100.
// -> CSI > Pp ; Pv ; Pc c
// where Pp denotes the terminal type
// Pp = 0 -> ``VT100''.
// Pp = 1 -> ``VT220''.
// and Pv is the firmware version (for xterm, this was originally
// the XFree86 patch number, starting with 95). In a DEC termi-
// nal, Pc indicates the ROM cartridge registration number and is
// always zero.
// More information:
// xterm/charproc.c - line 2012, for more information.
// vim responds with ^[[?0c or ^[[?1c after the terminal's response (?)
Terminal.prototype.sendDeviceAttributes = function(params) {
    if (params[0] > 0) return;

    if (!this.prefix) {
        if (this.is('xterm') || this.is('rxvt-unicode') || this.is('screen')) {
            this.send('\x1b[?1;2c');
        } else if (this.is('linux')) {
            this.send('\x1b[?6c');
        }
    } else if (this.prefix === '>') {
        // xterm and urxvt
        // seem to spit this
        // out around ~370 times (?).
        if (this.is('xterm')) {
            this.send('\x1b[>0;276;0c');
        } else if (this.is('rxvt-unicode')) {
            this.send('\x1b[>85;95;0c');
        } else if (this.is('linux')) {
            // not supported by linux console.
            // linux console echoes parameters.
            this.send(params[0] + 'c');
        } else if (this.is('screen')) {
            this.send('\x1b[>83;40003;0c');
        }
    }
};

// CSI Pm d
// Line Position Absolute [row] (default = [1,column]) (VPA).
Terminal.prototype.linePosAbsolute = function(params) {
    var param = params[0];
    if (param < 1) param = 1;
    this.y = param - 1;
    if (this.y >= this.rows) {
        this.y = this.rows - 1;
    }
};

// 145 65 e * VPR - Vertical Position Relative
// reuse CSI Ps B ?
Terminal.prototype.VPositionRelative = function(params) {
    var param = params[0];
    if (param < 1) param = 1;
    this.y += param;
    if (this.y >= this.rows) {
        this.y = this.rows - 1;
    }
};

// CSI Ps ; Ps f
// Horizontal and Vertical Position [row;column] (default =
// [1,1]) (HVP).
Terminal.prototype.HVPosition = function(params) {
    if (params[0] < 1) params[0] = 1;
    if (params[1] < 1) params[1] = 1;

    this.y = params[0] - 1;
    if (this.y >= this.rows) {
        this.y = this.rows - 1;
    }

    this.x = params[1] - 1;
    if (this.x >= this.cols) {
        this.x = this.cols - 1;
    }
};

// CSI Pm h Set Mode (SM).
// Ps = 2 -> Keyboard Action Mode (AM).
// Ps = 4 -> Insert Mode (IRM).
// Ps = 1 2 -> Send/receive (SRM).
// Ps = 2 0 -> Automatic Newline (LNM).
// CSI ? Pm h
// DEC Private Mode Set (DECSET).
// Ps = 1 -> Application Cursor Keys (DECCKM).
// Ps = 2 -> Designate USASCII for character sets G0-G3
// (DECANM), and set VT100 mode.
// Ps = 3 -> 132 Column Mode (DECCOLM).
// Ps = 4 -> Smooth (Slow) Scroll (DECSCLM).
// Ps = 5 -> Reverse Video (DECSCNM).
// Ps = 6 -> Origin Mode (DECOM).
// Ps = 7 -> Wraparound Mode (DECAWM).
// Ps = 8 -> Auto-repeat Keys (DECARM).
// Ps = 9 -> Send Mouse X & Y on button press. See the sec-
// tion Mouse Tracking.
// Ps = 1 0 -> Show toolbar (rxvt).
// Ps = 1 2 -> Start Blinking Cursor (att610).
// Ps = 1 8 -> Print form feed (DECPFF).
// Ps = 1 9 -> Set print extent to full screen (DECPEX).
// Ps = 2 5 -> Show Cursor (DECTCEM).
// Ps = 3 0 -> Show scrollbar (rxvt).
// Ps = 3 5 -> Enable font-shifting functions (rxvt).
// Ps = 3 8 -> Enter Tektronix Mode (DECTEK).
// Ps = 4 0 -> Allow 80 -> 132 Mode.
// Ps = 4 1 -> more(1) fix (see curses resource).
// Ps = 4 2 -> Enable Nation Replacement Character sets (DECN-
// RCM).
// Ps = 4 4 -> Turn On Margin Bell.
// Ps = 4 5 -> Reverse-wraparound Mode.
// Ps = 4 6 -> Start Logging. This is normally disabled by a
// compile-time option.
// Ps = 4 7 -> Use Alternate Screen Buffer. (This may be dis-
// abled by the titeInhibit resource).
// Ps = 6 6 -> Application keypad (DECNKM).
// Ps = 6 7 -> Backarrow key sends backspace (DECBKM).
// Ps = 1 0 0 0 -> Send Mouse X & Y on button press and
// release. See the section Mouse Tracking.
// Ps = 1 0 0 1 -> Use Hilite Mouse Tracking.
// Ps = 1 0 0 2 -> Use Cell Motion Mouse Tracking.
// Ps = 1 0 0 3 -> Use All Motion Mouse Tracking.
// Ps = 1 0 0 4 -> Send FocusIn/FocusOut events.
// Ps = 1 0 0 5 -> Enable Extended Mouse Mode.
// Ps = 1 0 1 0 -> Scroll to bottom on tty output (rxvt).
// Ps = 1 0 1 1 -> Scroll to bottom on key press (rxvt).
// Ps = 1 0 3 4 -> Interpret "meta" key, sets eighth bit.
// (enables the eightBitInput resource).
// Ps = 1 0 3 5 -> Enable special modifiers for Alt and Num-
// Lock keys. (This enables the numLock resource).
// Ps = 1 0 3 6 -> Send ESC when Meta modifies a key. (This
// enables the metaSendsEscape resource).
// Ps = 1 0 3 7 -> Send DEL from the editing-keypad Delete
// key.
// Ps = 1 0 3 9 -> Send ESC when Alt modifies a key. (This
// enables the altSendsEscape resource).
// Ps = 1 0 4 0 -> Keep selection even if not highlighted.
// (This enables the keepSelection resource).
// Ps = 1 0 4 1 -> Use the CLIPBOARD selection. (This enables
// the selectToClipboard resource).
// Ps = 1 0 4 2 -> Enable Urgency window manager hint when
// Control-G is received. (This enables the bellIsUrgent
// resource).
// Ps = 1 0 4 3 -> Enable raising of the window when Control-G
// is received. (enables the popOnBell resource).
// Ps = 1 0 4 7 -> Use Alternate Screen Buffer. (This may be
// disabled by the titeInhibit resource).
// Ps = 1 0 4 8 -> Save cursor as in DECSC. (This may be dis-
// abled by the titeInhibit resource).
// Ps = 1 0 4 9 -> Save cursor as in DECSC and use Alternate
// Screen Buffer, clearing it first. (This may be disabled by
// the titeInhibit resource). This combines the effects of the 1
// 0 4 7 and 1 0 4 8 modes. Use this with terminfo-based
// applications rather than the 4 7 mode.
// Ps = 1 0 5 0 -> Set terminfo/termcap function-key mode.
// Ps = 1 0 5 1 -> Set Sun function-key mode.
// Ps = 1 0 5 2 -> Set HP function-key mode.
// Ps = 1 0 5 3 -> Set SCO function-key mode.
// Ps = 1 0 6 0 -> Set legacy keyboard emulation (X11R6).
// Ps = 1 0 6 1 -> Set VT220 keyboard emulation.
// Ps = 2 0 0 4 -> Set bracketed paste mode.
// Modes:
// http://vt100.net/docs/vt220-rm/chapter4.html
Terminal.prototype.setMode = function(params) {
    if (typeof params === 'object') {
        var l = params.length,
            i = 0;

        for (; i < l; i++) {
            this.setMode(params[i]);
        }

        return;
    }

    if (!this.prefix) {
        switch (params) {
        case 4:
            this.insertMode = true;
            break;
        case 20:
            //this.convertEol = true;
            break;
        }
    } else if (this.prefix === '?') {
        switch (params) {
        case 1:
            this.applicationKeypad = true;
            break;
        case 2:
            this.setgCharset(0, Terminal.charsets.US);
            this.setgCharset(1, Terminal.charsets.US);
            this.setgCharset(2, Terminal.charsets.US);
            this.setgCharset(3, Terminal.charsets.US);
            // set VT100 mode here
            break;
        case 3:
            // 132 col mode
            this.savedCols = this.cols;
            this.resize(132, this.rows);
            break;
        case 6:
            this.originMode = true;
            break;
        case 7:
            this.wraparoundMode = true;
            break;
        case 12:
            // this.cursorBlink = true;
            break;
        case 9:
            // X10 Mouse
            // no release, no motion, no wheel, no modifiers.
        case 1000:
            // vt200 mouse
            // no motion.
            // no modifiers, except control on the wheel.
        case 1002:
            // button event mouse
        case 1003:
            // any event mouse
            // any event - sends motion events,
            // even if there is no button held down.
            this.x10Mouse = params === 9;
            this.vt200Mouse = params === 1000;
            this.normalMouse = params > 1000;
            this.mouseEvents = true;
            this.element.style.cursor = 'default';
            this.log('Binding to mouse events.');
            break;
        case 1004:
            // send focusin/focusout events
            // focusin: ^[[I
            // focusout: ^[[O
            this.sendFocus = true;
            break;
        case 1005:
            // utf8 ext mode mouse
            this.utfMouse = true;
            // for wide terminals
            // simply encodes large values as utf8 characters
            break;
        case 1006:
            // sgr ext mode mouse
            this.sgrMouse = true;
            // for wide terminals
            // does not add 32 to fields
            // press: ^[[<b;x;yM
            // release: ^[[<b;x;ym
            break;
        case 1015:
            // urxvt ext mode mouse
            this.urxvtMouse = true;
            // for wide terminals
            // numbers for fields
            // press: ^[[b;x;yM
            // motion: ^[[b;x;yT
            break;
        case 25:
            // show cursor
            this.cursorHidden = false;
            break;
        case 1049:
            // alt screen buffer cursor
            //this.saveCursor();
            ; // FALL-THROUGH
        case 47:
            // alt screen buffer
        case 1047:
            // alt screen buffer
            if (!this.normal) {
                var normal = {
                    lines: this.lines,
                    ybase: this.ybase,
                    ydisp: this.ydisp,
                    x: this.x,
                    y: this.y,
                    scrollTop: this.scrollTop,
                    scrollBottom: this.scrollBottom,
                    tabs: this.tabs
                    // XXX save charset(s) here?
                    // charset: this.charset,
                    // glevel: this.glevel,
                    // charsets: this.charsets
                };
                this.reset();
                this.normal = normal;
                this.showCursor();
            }
            break;
        }
    }
};

// CSI Pm l Reset Mode (RM).
// Ps = 2 -> Keyboard Action Mode (AM).
// Ps = 4 -> Replace Mode (IRM).
// Ps = 1 2 -> Send/receive (SRM).
// Ps = 2 0 -> Normal Linefeed (LNM).
// CSI ? Pm l
// DEC Private Mode Reset (DECRST).
// Ps = 1 -> Normal Cursor Keys (DECCKM).
// Ps = 2 -> Designate VT52 mode (DECANM).
// Ps = 3 -> 80 Column Mode (DECCOLM).
// Ps = 4 -> Jump (Fast) Scroll (DECSCLM).
// Ps = 5 -> Normal Video (DECSCNM).
// Ps = 6 -> Normal Cursor Mode (DECOM).
// Ps = 7 -> No Wraparound Mode (DECAWM).
// Ps = 8 -> No Auto-repeat Keys (DECARM).
// Ps = 9 -> Don't send Mouse X & Y on button press.
// Ps = 1 0 -> Hide toolbar (rxvt).
// Ps = 1 2 -> Stop Blinking Cursor (att610).
// Ps = 1 8 -> Don't print form feed (DECPFF).
// Ps = 1 9 -> Limit print to scrolling region (DECPEX).
// Ps = 2 5 -> Hide Cursor (DECTCEM).
// Ps = 3 0 -> Don't show scrollbar (rxvt).
// Ps = 3 5 -> Disable font-shifting functions (rxvt).
// Ps = 4 0 -> Disallow 80 -> 132 Mode.
// Ps = 4 1 -> No more(1) fix (see curses resource).
// Ps = 4 2 -> Disable Nation Replacement Character sets (DEC-
// NRCM).
// Ps = 4 4 -> Turn Off Margin Bell.
// Ps = 4 5 -> No Reverse-wraparound Mode.
// Ps = 4 6 -> Stop Logging. (This is normally disabled by a
// compile-time option).
// Ps = 4 7 -> Use Normal Screen Buffer.
// Ps = 6 6 -> Numeric keypad (DECNKM).
// Ps = 6 7 -> Backarrow key sends delete (DECBKM).
// Ps = 1 0 0 0 -> Don't send Mouse X & Y on button press and
// release. See the section Mouse Tracking.
// Ps = 1 0 0 1 -> Don't use Hilite Mouse Tracking.
// Ps = 1 0 0 2 -> Don't use Cell Motion Mouse Tracking.
// Ps = 1 0 0 3 -> Don't use All Motion Mouse Tracking.
// Ps = 1 0 0 4 -> Don't send FocusIn/FocusOut events.
// Ps = 1 0 0 5 -> Disable Extended Mouse Mode.
// Ps = 1 0 1 0 -> Don't scroll to bottom on tty output
// (rxvt).
// Ps = 1 0 1 1 -> Don't scroll to bottom on key press (rxvt).
// Ps = 1 0 3 4 -> Don't interpret "meta" key. (This disables
// the eightBitInput resource).
// Ps = 1 0 3 5 -> Disable special modifiers for Alt and Num-
// Lock keys. (This disables the numLock resource).
// Ps = 1 0 3 6 -> Don't send ESC when Meta modifies a key.
// (This disables the metaSendsEscape resource).
// Ps = 1 0 3 7 -> Send VT220 Remove from the editing-keypad
// Delete key.
// Ps = 1 0 3 9 -> Don't send ESC when Alt modifies a key.
// (This disables the altSendsEscape resource).
// Ps = 1 0 4 0 -> Do not keep selection when not highlighted.
// (This disables the keepSelection resource).
// Ps = 1 0 4 1 -> Use the PRIMARY selection. (This disables
// the selectToClipboard resource).
// Ps = 1 0 4 2 -> Disable Urgency window manager hint when
// Control-G is received. (This disables the bellIsUrgent
// resource).
// Ps = 1 0 4 3 -> Disable raising of the window when Control-
// G is received. (This disables the popOnBell resource).
// Ps = 1 0 4 7 -> Use Normal Screen Buffer, clearing screen
// first if in the Alternate Screen. (This may be disabled by
// the titeInhibit resource).
// Ps = 1 0 4 8 -> Restore cursor as in DECRC. (This may be
// disabled by the titeInhibit resource).
// Ps = 1 0 4 9 -> Use Normal Screen Buffer and restore cursor
// as in DECRC. (This may be disabled by the titeInhibit
// resource). This combines the effects of the 1 0 4 7 and 1 0
// 4 8 modes. Use this with terminfo-based applications rather
// than the 4 7 mode.
// Ps = 1 0 5 0 -> Reset terminfo/termcap function-key mode.
// Ps = 1 0 5 1 -> Reset Sun function-key mode.
// Ps = 1 0 5 2 -> Reset HP function-key mode.
// Ps = 1 0 5 3 -> Reset SCO function-key mode.
// Ps = 1 0 6 0 -> Reset legacy keyboard emulation (X11R6).
// Ps = 1 0 6 1 -> Reset keyboard emulation to Sun/PC style.
// Ps = 2 0 0 4 -> Reset bracketed paste mode.
Terminal.prototype.resetMode = function(params) {
    if (typeof params === 'object') {
        var l = params.length,
            i = 0;

        for (; i < l; i++) {
            this.resetMode(params[i]);
        }

        return;
    }

    if (!this.prefix) {
        switch (params) {
        case 4:
            this.insertMode = false;
            break;
        case 20:
            //this.convertEol = false;
            break;
        }
    } else if (this.prefix === '?') {
        switch (params) {
        case 1:
            this.applicationKeypad = false;
            break;
        case 3:
            if (this.cols === 132 && this.savedCols) {
                this.resize(this.savedCols, this.rows);
            }
            delete this.savedCols;
            break;
        case 6:
            this.originMode = false;
            break;
        case 7:
            this.wraparoundMode = false;
            break;
        case 12:
            // this.cursorBlink = false;
            break;
        case 9:
            // X10 Mouse
        case 1000:
            // vt200 mouse
        case 1002:
            // button event mouse
        case 1003:
            // any event mouse
            this.x10Mouse = false;
            this.vt200Mouse = false;
            this.normalMouse = false;
            this.mouseEvents = false;
            this.element.style.cursor = '';
            break;
        case 1004:
            // send focusin/focusout events
            this.sendFocus = false;
            break;
        case 1005:
            // utf8 ext mode mouse
            this.utfMouse = false;
            break;
        case 1006:
            // sgr ext mode mouse
            this.sgrMouse = false;
            break;
        case 1015:
            // urxvt ext mode mouse
            this.urxvtMouse = false;
            break;
        case 25:
            // hide cursor
            this.cursorHidden = true;
            break;
        case 1049:
            // alt screen buffer cursor
            ; // FALL-THROUGH
        case 47:
            // normal screen buffer
        case 1047:
            // normal screen buffer - clearing it first
            if (this.normal) {
                this.lines = this.normal.lines;
                this.ybase = this.normal.ybase;
                this.ydisp = this.normal.ydisp;
                this.x = this.normal.x;
                this.y = this.normal.y;
                this.scrollTop = this.normal.scrollTop;
                this.scrollBottom = this.normal.scrollBottom;
                this.tabs = this.normal.tabs;
                this.normal = null;
                // if (params === 1049) {
                // this.x = this.savedX;
                // this.y = this.savedY;
                // }
                this.refresh(0, this.rows - 1);
                this.showCursor();
            }
            break;
        }
    }
};

// CSI Ps ; Ps r
// Set Scrolling Region [top;bottom] (default = full size of win-
// dow) (DECSTBM).
// CSI ? Pm r
Terminal.prototype.setScrollRegion = function(params) {
    if (this.prefix) return;
    this.scrollTop = (params[0] || 1) - 1;
    this.scrollBottom = (params[1] || this.rows) - 1;
    this.x = 0;
    this.y = 0;
};

// CSI s
// Save cursor (ANSI.SYS).
Terminal.prototype.saveCursor = function(params) {
    this.savedX = this.x;
    this.savedY = this.y;
};

// CSI u
// Restore cursor (ANSI.SYS).
Terminal.prototype.restoreCursor = function(params) {
    this.x = this.savedX || 0;
    this.y = this.savedY || 0;
};

/**
* Lesser Used
*/

// CSI Ps I
// Cursor Forward Tabulation Ps tab stops (default = 1) (CHT).
Terminal.prototype.cursorForwardTab = function(params) {
    var param = params[0] || 1;
    while (param--) {
        this.x = this.nextStop();
    }
};

// CSI Ps S Scroll up Ps lines (default = 1) (SU).
Terminal.prototype.scrollUp = function(params) {
    var param = params[0] || 1;
    while (param--) {
        this.lines.splice(this.ybase + this.scrollTop, 1);
        this.lines.splice(this.ybase + this.scrollBottom, 0, this.blankLine());
    }
    // this.maxRange();
    this.updateRange(this.scrollTop);
    this.updateRange(this.scrollBottom);
};

// CSI Ps T Scroll down Ps lines (default = 1) (SD).
Terminal.prototype.scrollDown = function(params) {
    var param = params[0] || 1;
    while (param--) {
        this.lines.splice(this.ybase + this.scrollBottom, 1);
        this.lines.splice(this.ybase + this.scrollTop, 0, this.blankLine());
    }
    // this.maxRange();
    this.updateRange(this.scrollTop);
    this.updateRange(this.scrollBottom);
};

// CSI Ps ; Ps ; Ps ; Ps ; Ps T
// Initiate highlight mouse tracking. Parameters are
// [func;startx;starty;firstrow;lastrow]. See the section Mouse
// Tracking.
Terminal.prototype.initMouseTracking = function(params) {
    // Relevant: DECSET 1001
};

// CSI > Ps; Ps T
// Reset one or more features of the title modes to the default
// value. Normally, "reset" disables the feature. It is possi-
// ble to disable the ability to reset features by compiling a
// different default for the title modes into xterm.
// Ps = 0 -> Do not set window/icon labels using hexadecimal.
// Ps = 1 -> Do not query window/icon labels using hexadeci-
// mal.
// Ps = 2 -> Do not set window/icon labels using UTF-8.
// Ps = 3 -> Do not query window/icon labels using UTF-8.
// (See discussion of "Title Modes").
Terminal.prototype.resetTitleModes = function(params) {;
};

// CSI Ps Z Cursor Backward Tabulation Ps tab stops (default = 1) (CBT).
Terminal.prototype.cursorBackwardTab = function(params) {
    var param = params[0] || 1;
    while (param--) {
        this.x = this.prevStop();
    }
};

// CSI Ps b Repeat the preceding graphic character Ps times (REP).
Terminal.prototype.repeatPrecedingCharacter = function(params) {
    var param = params[0] || 1,
        line = this.lines[this.ybase + this.y],
        ch = line[this.x - 1] || [this.defAttr, ' '];

    while (param--) line[this.x++] = ch;
};

// CSI Ps g Tab Clear (TBC).
// Ps = 0 -> Clear Current Column (default).
// Ps = 3 -> Clear All.
// Potentially:
// Ps = 2 -> Clear Stops on Line.
// http://vt100.net/annarbor/aaa-ug/section6.html
Terminal.prototype.tabClear = function(params) {
    var param = params[0];
    if (param <= 0) {
        delete this.tabs[this.x];
    } else if (param === 3) {
        this.tabs = {};
    }
};

// CSI Pm i Media Copy (MC).
// Ps = 0 -> Print screen (default).
// Ps = 4 -> Turn off printer controller mode.
// Ps = 5 -> Turn on printer controller mode.
// CSI ? Pm i
// Media Copy (MC, DEC-specific).
// Ps = 1 -> Print line containing cursor.
// Ps = 4 -> Turn off autoprint mode.
// Ps = 5 -> Turn on autoprint mode.
// Ps = 1 0 -> Print composed display, ignores DECPEX.
// Ps = 1 1 -> Print all pages.
Terminal.prototype.mediaCopy = function(params) {;
};

// CSI > Ps; Ps m
// Set or reset resource-values used by xterm to decide whether
// to construct escape sequences holding information about the
// modifiers pressed with a given key. The first parameter iden-
// tifies the resource to set/reset. The second parameter is the
// value to assign to the resource. If the second parameter is
// omitted, the resource is reset to its initial value.
// Ps = 1 -> modifyCursorKeys.
// Ps = 2 -> modifyFunctionKeys.
// Ps = 4 -> modifyOtherKeys.
// If no parameters are given, all resources are reset to their
// initial values.
Terminal.prototype.setResources = function(params) {;
};

// CSI > Ps n
// Disable modifiers which may be enabled via the CSI > Ps; Ps m
// sequence. This corresponds to a resource value of "-1", which
// cannot be set with the other sequence. The parameter identi-
// fies the resource to be disabled:
// Ps = 1 -> modifyCursorKeys.
// Ps = 2 -> modifyFunctionKeys.
// Ps = 4 -> modifyOtherKeys.
// If the parameter is omitted, modifyFunctionKeys is disabled.
// When modifyFunctionKeys is disabled, xterm uses the modifier
// keys to make an extended sequence of functions rather than
// adding a parameter to each function key to denote the modi-
// fiers.
Terminal.prototype.disableModifiers = function(params) {;
};

// CSI > Ps p
// Set resource value pointerMode. This is used by xterm to
// decide whether to hide the pointer cursor as the user types.
// Valid values for the parameter:
// Ps = 0 -> never hide the pointer.
// Ps = 1 -> hide if the mouse tracking mode is not enabled.
// Ps = 2 -> always hide the pointer. If no parameter is
// given, xterm uses the default, which is 1 .
Terminal.prototype.setPointerMode = function(params) {;
};

// CSI ! p Soft terminal reset (DECSTR).
// http://vt100.net/docs/vt220-rm/table4-10.html
Terminal.prototype.softReset = function(params) {
    this.cursorHidden = false;
    this.insertMode = false;
    this.originMode = false;
    this.wraparoundMode = false; // autowrap
    this.applicationKeypad = false; // ?
    this.scrollTop = 0;
    this.scrollBottom = this.rows - 1;
    this.curAttr = this.defAttr;
    this.x = this.y = 0; // ?
    this.charset = null;
    this.glevel = 0; // ??
    this.charsets = [null]; // ??
};

// CSI Ps$ p
// Request ANSI mode (DECRQM). For VT300 and up, reply is
// CSI Ps; Pm$ y
// where Ps is the mode number as in RM, and Pm is the mode
// value:
// 0 - not recognized
// 1 - set
// 2 - reset
// 3 - permanently set
// 4 - permanently reset
Terminal.prototype.requestAnsiMode = function(params) {;
};

// CSI ? Ps$ p
// Request DEC private mode (DECRQM). For VT300 and up, reply is
// CSI ? Ps; Pm$ p
// where Ps is the mode number as in DECSET, Pm is the mode value
// as in the ANSI DECRQM.
Terminal.prototype.requestPrivateMode = function(params) {;
};

// CSI Ps ; Ps " p
// Set conformance level (DECSCL). Valid values for the first
// parameter:
// Ps = 6 1 -> VT100.
// Ps = 6 2 -> VT200.
// Ps = 6 3 -> VT300.
// Valid values for the second parameter:
// Ps = 0 -> 8-bit controls.
// Ps = 1 -> 7-bit controls (always set for VT100).
// Ps = 2 -> 8-bit controls.
Terminal.prototype.setConformanceLevel = function(params) {;
};

// CSI Ps q Load LEDs (DECLL).
// Ps = 0 -> Clear all LEDS (default).
// Ps = 1 -> Light Num Lock.
// Ps = 2 -> Light Caps Lock.
// Ps = 3 -> Light Scroll Lock.
// Ps = 2 1 -> Extinguish Num Lock.
// Ps = 2 2 -> Extinguish Caps Lock.
// Ps = 2 3 -> Extinguish Scroll Lock.
Terminal.prototype.loadLEDs = function(params) {;
};

// CSI Ps SP q
// Set cursor style (DECSCUSR, VT520).
// Ps = 0 -> blinking block.
// Ps = 1 -> blinking block (default).
// Ps = 2 -> steady block.
// Ps = 3 -> blinking underline.
// Ps = 4 -> steady underline.
Terminal.prototype.setCursorStyle = function(params) {;
};

// CSI Ps " q
// Select character protection attribute (DECSCA). Valid values
// for the parameter:
// Ps = 0 -> DECSED and DECSEL can erase (default).
// Ps = 1 -> DECSED and DECSEL cannot erase.
// Ps = 2 -> DECSED and DECSEL can erase.
Terminal.prototype.setCharProtectionAttr = function(params) {;
};

// CSI ? Pm r
// Restore DEC Private Mode Values. The value of Ps previously
// saved is restored. Ps values are the same as for DECSET.
Terminal.prototype.restorePrivateValues = function(params) {;
};

// CSI Pt; Pl; Pb; Pr; Ps$ r
// Change Attributes in Rectangular Area (DECCARA), VT400 and up.
// Pt; Pl; Pb; Pr denotes the rectangle.
// Ps denotes the SGR attributes to change: 0, 1, 4, 5, 7.
// NOTE: xterm doesn't enable this code by default.
Terminal.prototype.setAttrInRectangle = function(params) {
    var t = params[0],
        l = params[1],
        b = params[2],
        r = params[3],
        attr = params[4];

    var line, i;

    for (; t < b + 1; t++) {
        line = this.lines[this.ybase + t];
        for (i = l; i < r; i++) {
            line[i] = [attr, line[i][1]];
        }
    }

    // this.maxRange();
    this.updateRange(params[0]);
    this.updateRange(params[2]);
};

// CSI ? Pm s
// Save DEC Private Mode Values. Ps values are the same as for
// DECSET.
Terminal.prototype.savePrivateValues = function(params) {;
};

// CSI Ps ; Ps ; Ps t
// Window manipulation (from dtterm, as well as extensions).
// These controls may be disabled using the allowWindowOps
// resource. Valid values for the first (and any additional
// parameters) are:
// Ps = 1 -> De-iconify window.
// Ps = 2 -> Iconify window.
// Ps = 3 ; x ; y -> Move window to [x, y].
// Ps = 4 ; height ; width -> Resize the xterm window to
// height and width in pixels.
// Ps = 5 -> Raise the xterm window to the front of the stack-
// ing order.
// Ps = 6 -> Lower the xterm window to the bottom of the
// stacking order.
// Ps = 7 -> Refresh the xterm window.
// Ps = 8 ; height ; width -> Resize the text area to
// [height;width] in characters.
// Ps = 9 ; 0 -> Restore maximized window.
// Ps = 9 ; 1 -> Maximize window (i.e., resize to screen
// size).
// Ps = 1 0 ; 0 -> Undo full-screen mode.
// Ps = 1 0 ; 1 -> Change to full-screen.
// Ps = 1 1 -> Report xterm window state. If the xterm window
// is open (non-iconified), it returns CSI 1 t . If the xterm
// window is iconified, it returns CSI 2 t .
// Ps = 1 3 -> Report xterm window position. Result is CSI 3
// ; x ; y t
// Ps = 1 4 -> Report xterm window in pixels. Result is CSI
// 4 ; height ; width t
// Ps = 1 8 -> Report the size of the text area in characters.
// Result is CSI 8 ; height ; width t
// Ps = 1 9 -> Report the size of the screen in characters.
// Result is CSI 9 ; height ; width t
// Ps = 2 0 -> Report xterm window's icon label. Result is
// OSC L label ST
// Ps = 2 1 -> Report xterm window's title. Result is OSC l
// label ST
// Ps = 2 2 ; 0 -> Save xterm icon and window title on
// stack.
// Ps = 2 2 ; 1 -> Save xterm icon title on stack.
// Ps = 2 2 ; 2 -> Save xterm window title on stack.
// Ps = 2 3 ; 0 -> Restore xterm icon and window title from
// stack.
// Ps = 2 3 ; 1 -> Restore xterm icon title from stack.
// Ps = 2 3 ; 2 -> Restore xterm window title from stack.
// Ps >= 2 4 -> Resize to Ps lines (DECSLPP).
Terminal.prototype.manipulateWindow = function(params) {;
};

// CSI Pt; Pl; Pb; Pr; Ps$ t
// Reverse Attributes in Rectangular Area (DECRARA), VT400 and
// up.
// Pt; Pl; Pb; Pr denotes the rectangle.
// Ps denotes the attributes to reverse, i.e., 1, 4, 5, 7.
// NOTE: xterm doesn't enable this code by default.
Terminal.prototype.reverseAttrInRectangle = function(params) {;
};

// CSI > Ps; Ps t
// Set one or more features of the title modes. Each parameter
// enables a single feature.
// Ps = 0 -> Set window/icon labels using hexadecimal.
// Ps = 1 -> Query window/icon labels using hexadecimal.
// Ps = 2 -> Set window/icon labels using UTF-8.
// Ps = 3 -> Query window/icon labels using UTF-8. (See dis-
// cussion of "Title Modes")
Terminal.prototype.setTitleModeFeature = function(params) {;
};

// CSI Ps SP t
// Set warning-bell volume (DECSWBV, VT520).
// Ps = 0 or 1 -> off.
// Ps = 2 , 3 or 4 -> low.
// Ps = 5 , 6 , 7 , or 8 -> high.
Terminal.prototype.setWarningBellVolume = function(params) {;
};

// CSI Ps SP u
// Set margin-bell volume (DECSMBV, VT520).
// Ps = 1 -> off.
// Ps = 2 , 3 or 4 -> low.
// Ps = 0 , 5 , 6 , 7 , or 8 -> high.
Terminal.prototype.setMarginBellVolume = function(params) {;
};

// CSI Pt; Pl; Pb; Pr; Pp; Pt; Pl; Pp$ v
// Copy Rectangular Area (DECCRA, VT400 and up).
// Pt; Pl; Pb; Pr denotes the rectangle.
// Pp denotes the source page.
// Pt; Pl denotes the target location.
// Pp denotes the target page.
// NOTE: xterm doesn't enable this code by default.
Terminal.prototype.copyRectangle = function(params) {;
};

// CSI Pt ; Pl ; Pb ; Pr ' w
// Enable Filter Rectangle (DECEFR), VT420 and up.
// Parameters are [top;left;bottom;right].
// Defines the coordinates of a filter rectangle and activates
// it. Anytime the locator is detected outside of the filter
// rectangle, an outside rectangle event is generated and the
// rectangle is disabled. Filter rectangles are always treated
// as "one-shot" events. Any parameters that are omitted default
// to the current locator position. If all parameters are omit-
// ted, any locator motion will be reported. DECELR always can-
// cels any prevous rectangle definition.
Terminal.prototype.enableFilterRectangle = function(params) {;
};

// CSI Ps x Request Terminal Parameters (DECREQTPARM).
// if Ps is a "0" (default) or "1", and xterm is emulating VT100,
// the control sequence elicits a response of the same form whose
// parameters describe the terminal:
// Ps -> the given Ps incremented by 2.
// Pn = 1 <- no parity.
// Pn = 1 <- eight bits.
// Pn = 1 <- 2 8 transmit 38.4k baud.
// Pn = 1 <- 2 8 receive 38.4k baud.
// Pn = 1 <- clock multiplier.
// Pn = 0 <- STP flags.
Terminal.prototype.requestParameters = function(params) {;
};

// CSI Ps x Select Attribute Change Extent (DECSACE).
// Ps = 0 -> from start to end position, wrapped.
// Ps = 1 -> from start to end position, wrapped.
// Ps = 2 -> rectangle (exact).
Terminal.prototype.selectChangeExtent = function(params) {;
};

// CSI Pc; Pt; Pl; Pb; Pr$ x
// Fill Rectangular Area (DECFRA), VT420 and up.
// Pc is the character to use.
// Pt; Pl; Pb; Pr denotes the rectangle.
// NOTE: xterm doesn't enable this code by default.
Terminal.prototype.fillRectangle = function(params) {
    var ch = params[0],
        t = params[1],
        l = params[2],
        b = params[3],
        r = params[4];

    var line, i;

    for (; t < b + 1; t++) {
        line = this.lines[this.ybase + t];
        for (i = l; i < r; i++) {
            line[i] = [line[i][0], String.fromCharCode(ch)];
        }
    }

    // this.maxRange();
    this.updateRange(params[1]);
    this.updateRange(params[3]);
};

// CSI Ps ; Pu ' z
// Enable Locator Reporting (DECELR).
// Valid values for the first parameter:
// Ps = 0 -> Locator disabled (default).
// Ps = 1 -> Locator enabled.
// Ps = 2 -> Locator enabled for one report, then disabled.
// The second parameter specifies the coordinate unit for locator
// reports.
// Valid values for the second parameter:
// Pu = 0 <- or omitted -> default to character cells.
// Pu = 1 <- device physical pixels.
// Pu = 2 <- character cells.
Terminal.prototype.enableLocatorReporting = function(params) {
    var val = params[0] > 0;
    //this.mouseEvents = val;
    //this.decLocator = val;
};

// CSI Pt; Pl; Pb; Pr$ z
// Erase Rectangular Area (DECERA), VT400 and up.
// Pt; Pl; Pb; Pr denotes the rectangle.
// NOTE: xterm doesn't enable this code by default.
Terminal.prototype.eraseRectangle = function(params) {
    var t = params[0],
        l = params[1],
        b = params[2],
        r = params[3];

    var line, i, ch;

    ch = [this.curAttr, ' ']; // xterm?

    for (; t < b + 1; t++) {
        line = this.lines[this.ybase + t];
        for (i = l; i < r; i++) {
            line[i] = ch;
        }
    }

    // this.maxRange();
    this.updateRange(params[0]);
    this.updateRange(params[2]);
};

// CSI Pm ' {
// Select Locator Events (DECSLE).
// Valid values for the first (and any additional parameters)
// are:
// Ps = 0 -> only respond to explicit host requests (DECRQLP).
// (This is default). It also cancels any filter
// rectangle.
// Ps = 1 -> report button down transitions.
// Ps = 2 -> do not report button down transitions.
// Ps = 3 -> report button up transitions.
// Ps = 4 -> do not report button up transitions.
Terminal.prototype.setLocatorEvents = function(params) {;
};

// CSI Pt; Pl; Pb; Pr$ {
// Selective Erase Rectangular Area (DECSERA), VT400 and up.
// Pt; Pl; Pb; Pr denotes the rectangle.
Terminal.prototype.selectiveEraseRectangle = function(params) {;
};

// CSI Ps ' |
// Request Locator Position (DECRQLP).
// Valid values for the parameter are:
// Ps = 0 , 1 or omitted -> transmit a single DECLRP locator
// report.

// If Locator Reporting has been enabled by a DECELR, xterm will
// respond with a DECLRP Locator Report. This report is also
// generated on button up and down events if they have been
// enabled with a DECSLE, or when the locator is detected outside
// of a filter rectangle, if filter rectangles have been enabled
// with a DECEFR.

// -> CSI Pe ; Pb ; Pr ; Pc ; Pp & w

// Parameters are [event;button;row;column;page].
// Valid values for the event:
// Pe = 0 -> locator unavailable - no other parameters sent.
// Pe = 1 -> request - xterm received a DECRQLP.
// Pe = 2 -> left button down.
// Pe = 3 -> left button up.
// Pe = 4 -> middle button down.
// Pe = 5 -> middle button up.
// Pe = 6 -> right button down.
// Pe = 7 -> right button up.
// Pe = 8 -> M4 button down.
// Pe = 9 -> M4 button up.
// Pe = 1 0 -> locator outside filter rectangle.
// ``button'' parameter is a bitmask indicating which buttons are
// pressed:
// Pb = 0 <- no buttons down.
// Pb & 1 <- right button down.
// Pb & 2 <- middle button down.
// Pb & 4 <- left button down.
// Pb & 8 <- M4 button down.
// ``row'' and ``column'' parameters are the coordinates of the
// locator position in the xterm window, encoded as ASCII deci-
// mal.
// The ``page'' parameter is not used by xterm, and will be omit-
// ted.
Terminal.prototype.requestLocatorPosition = function(params) {;
};

// CSI P m SP }
// Insert P s Column(s) (default = 1) (DECIC), VT420 and up.
// NOTE: xterm doesn't enable this code by default.
Terminal.prototype.insertColumns = function() {
    var param = params[0],
        l = this.ybase + this.rows,
        ch = [this.curAttr, ' '] // xterm?
        ,
        i;

    while (param--) {
        for (i = this.ybase; i < l; i++) {
            this.lines[i].splice(this.x + 1, 0, ch);
            this.lines[i].pop();
        }
    }

    this.maxRange();
};

// CSI P m SP ~
// Delete P s Column(s) (default = 1) (DECDC), VT420 and up
// NOTE: xterm doesn't enable this code by default.
Terminal.prototype.deleteColumns = function() {
    var param = params[0],
        l = this.ybase + this.rows,
        ch = [this.curAttr, ' '] // xterm?
        ,
        i;

    while (param--) {
        for (i = this.ybase; i < l; i++) {
            this.lines[i].splice(this.x, 1);
            this.lines[i].push(ch);
        }
    }

    this.maxRange();
};

/**
* Character Sets
*/

Terminal.charsets = {};

// DEC Special Character and Line Drawing Set.
// http://vt100.net/docs/vt102-ug/table5-13.html
// A lot of curses apps use this if they see TERM=xterm.
// testing: echo -e '\e(0a\e(B'
// The xterm output sometimes seems to conflict with the
// reference above. xterm seems in line with the reference
// when running vttest however.
// The table below now uses xterm's output from vttest.
Terminal.charsets.SCLD = { // (0
    '`': '\u25c6', // '◆'
    'a': '\u2592', // '▒'
    'b': '\u0009', // '\t'
    'c': '\u000c', // '\f'
    'd': '\u000d', // '\r'
    'e': '\u000a', // '\n'
    'f': '\u00b0', // '°'
    'g': '\u00b1', // '±'
    'h': '\u2424', // '\u2424' (NL)
    'i': '\u000b', // '\v'
    'j': '\u2518', // '┘'
    'k': '\u2510', // '┐'
    'l': '\u250c', // '┌'
    'm': '\u2514', // '└'
    'n': '\u253c', // '┼'
    'o': '\u23ba', // '⎺'
    'p': '\u23bb', // '⎻'
    'q': '\u2500', // '─'
    'r': '\u23bc', // '⎼'
    's': '\u23bd', // '⎽'
    't': '\u251c', // '├'
    'u': '\u2524', // '┤'
    'v': '\u2534', // '┴'
    'w': '\u252c', // '┬'
    'x': '\u2502', // '│'
    'y': '\u2264', // '≤'
    'z': '\u2265', // '≥'
    '{': '\u03c0', // 'π'
    '|': '\u2260', // '≠'
    '}': '\u00a3', // '£'
    '~': '\u00b7' // '·'
};

Terminal.charsets.UK = null; // (A
Terminal.charsets.US = null; // (B (USASCII)
Terminal.charsets.Dutch = null; // (4
Terminal.charsets.Finnish = null; // (C or (5
Terminal.charsets.French = null; // (R
Terminal.charsets.FrenchCanadian = null; // (Q
Terminal.charsets.German = null; // (K
Terminal.charsets.Italian = null; // (Y
Terminal.charsets.NorwegianDanish = null; // (E or (6
Terminal.charsets.Spanish = null; // (Z
Terminal.charsets.Swedish = null; // (H or (7
Terminal.charsets.Swiss = null; // (=
Terminal.charsets.ISOLatin = null; // /A

/**
* Helpers
*/

function on(el, type, handler, capture) {
    el.addEventListener(type, handler, capture || false);
}

function off(el, type, handler, capture) {
    el.removeEventListener(type, handler, capture || false);
}

function cancel(ev) {
    if (ev.preventDefault) ev.preventDefault();
    ev.returnValue = false;
    if (ev.stopPropagation) ev.stopPropagation();
    ev.cancelBubble = true;
    return false;
}

function inherits(child, parent) {
    function f() {
        this.constructor = child;
    }
    f.prototype = parent.prototype;
    child.prototype = new f;
}

var isMac = ~navigator.userAgent.indexOf('Mac');

// if bold is broken, we can't
// use it in the terminal.
function isBoldBroken() {
    var el = document.createElement('span');
    el.innerHTML = 'hello world';
    document.body.appendChild(el);
    var w1 = el.scrollWidth;
    el.style.fontWeight = 'bold';
    var w2 = el.scrollWidth;
    document.body.removeChild(el);
    return w1 !== w2;
}

var String = this.String;
var setTimeout = this.setTimeout;
var setInterval = this.setInterval;

/**
* Expose
*/

Terminal.EventEmitter = EventEmitter;
Terminal.isMac = isMac;
Terminal.on = on;
Terminal.off = off;
Terminal.cancel = cancel;