905 lines
24 KiB
JavaScript
905 lines
24 KiB
JavaScript
//
|
|
// Applesoft BASIC in Javascript
|
|
// TTY Emulation
|
|
//
|
|
|
|
// Copyright (C) 2009-2011 Joshua Bell
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
// Usage:
|
|
//
|
|
// tty = new TTY( screen_element, keyboard_element, bell );
|
|
// tty.clearScreen()
|
|
// tty.scrollScreen()
|
|
// tty.setTextStyle( textStyle )
|
|
// { width: w, height: h } = tty.getScreenSize()
|
|
// { x: x, y: y } = tty.getCursorPosition()
|
|
// tty.setFirmwareActive( bool )
|
|
// tty.setCursorPosition( x, y )
|
|
// tty.showCursor()
|
|
// tty.hideCursor()
|
|
// tty.focus()
|
|
//
|
|
// This just calls writeChar() in a loop; no need to hook it
|
|
// tty.writeString( string )
|
|
//
|
|
// The following can be hooked:
|
|
// tty.readLine( callback_function, prompt )
|
|
// tty.readChar( callback_function )
|
|
// tty.writeChar( c )
|
|
//
|
|
// tty.TEXT_STYLE_NORMAL = 0
|
|
// tty.TEXT_STYLE_INVERSE = 1
|
|
// tty.TEXT_STYLE_FLASH = 2
|
|
//
|
|
// Example:
|
|
//
|
|
// <script>
|
|
// tty = new TTY( document.getElementById( 'screen' ), document.getElementById( 'keyboard' ), 80, 24 );
|
|
// </script>
|
|
// <style>
|
|
// #screen { font-size: 10pt; font-family: monospace; font-weight: bold; background-color: black; color: #80ff80; }
|
|
// .normal { background-color: #000000; color: #80ff80; }
|
|
// .inverse { background-color: #80ff80; color: #000000; }
|
|
// </style>
|
|
// <div id="screen" tabindex="0"></div>
|
|
|
|
/*global getClassList*/ // from polyfill.js
|
|
/*global identifyKey */ // From keyboard.js
|
|
|
|
function TTY(screenElement, keyboardElement, bell) {
|
|
/*jslint browser: true, white: false, bitwise: false */
|
|
|
|
|
|
// Constants
|
|
|
|
|
|
this.TEXT_STYLE_NORMAL = 0;
|
|
this.TEXT_STYLE_INVERSE = 1;
|
|
this.TEXT_STYLE_FLASH = 2;
|
|
|
|
|
|
// Internal Fields
|
|
|
|
|
|
// For references to "this" within callbacks and closures
|
|
var self = this,
|
|
|
|
// Display
|
|
cursorX = 0,
|
|
cursorY = 0,
|
|
cursorVisible = false,
|
|
cursorElement = null,
|
|
styleElem,
|
|
screenGrid,
|
|
screenRow = [],
|
|
splitPos = 0,
|
|
screenWidth,
|
|
screenHeight,
|
|
curStyle = this.TEXT_STYLE_NORMAL,
|
|
cursorState = true,
|
|
cursorInterval,
|
|
firmwareActive = true, // 80-column firmware
|
|
mousetext = false,
|
|
|
|
// Input
|
|
lineCallback,
|
|
charCallback,
|
|
inputBuffer = [],
|
|
keyboardRegister = 0,
|
|
keyDown = false,
|
|
capsLock = true, // Caps lock state is tracked unique to the TTY
|
|
buttonState = [0, 0, 0, 0];
|
|
|
|
this.autoScroll = true;
|
|
|
|
|
|
|
|
//
|
|
// Display
|
|
//
|
|
|
|
function setCellByte(x, y, byte) {
|
|
var cell = screenGrid[x + screenWidth * y];
|
|
if (cell && cell.byte !== byte) {
|
|
cell.byte = byte;
|
|
cell.elem.className = 'a2c a2c' + String(byte);
|
|
}
|
|
}
|
|
|
|
// Apple II Character Generator (byte->character map)
|
|
// 0x00-0x1F = INVERSE @ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_
|
|
// 0x20-0x3F = INVERSE !"#$%&'()*+,-./0123456789:;<=>?
|
|
// 0x40-0x5F = FLASH @ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_ (80-col firmware active: mousetext symbols)
|
|
// 0x60-0x7F = FLASH !"#$%&'()*+,-./0123456789:;<=>? (80-col firmware active: inverse lowercase)
|
|
// 0x80-0x9F = NORMAL @ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_
|
|
// 0xA0-0xBF = NORMAL !"#$%&'()*+,-./0123456789:;<=>?
|
|
// 0xC0-0xDF = NORMAL @ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_
|
|
// 0xE0-0xFF = NORMAL `abcdefghijklmnopqrstuvwxyz{|}~
|
|
|
|
|
|
function setCellChar(x, y, c) {
|
|
var byte;
|
|
|
|
if (c > 0xff) {
|
|
// Extension characters
|
|
byte = c;
|
|
} else {
|
|
// Lock to 7-bit; Control characters should be filtered already
|
|
c = (c >>> 0) & 0x7f;
|
|
|
|
if (firmwareActive) {
|
|
if (curStyle === self.TEXT_STYLE_INVERSE) {
|
|
if (0x20 <= c && c < 0x40) { byte = c; }
|
|
else if (0x40 <= c && c < 0x60) { byte = c - (mousetext ? 0 : 0x40); }
|
|
else if (0x60 <= c && c < 0x80) { byte = c; }
|
|
} else if (curStyle === self.TEXT_STYLE_FLASH) {
|
|
if (0x20 <= c && c < 0x40) { byte = c + 0x40; }
|
|
else if (0x40 <= c && c < 0x60) { byte = c - 0x40; }
|
|
else if (0x60 <= c && c < 0x80) { byte = c; }
|
|
} else {
|
|
if (0x20 <= c && c < 0x40) { byte = c + 0x80; }
|
|
else if (0x40 <= c && c < 0x60) { byte = c + 0x80; }
|
|
else if (0x60 <= c && c < 0x80) { byte = c + 0x80; }
|
|
}
|
|
} else {
|
|
if (curStyle === self.TEXT_STYLE_INVERSE) {
|
|
if (0x20 <= c && c < 0x40) { byte = c; }
|
|
else if (0x40 <= c && c < 0x60) { byte = c - 0x40; }
|
|
else if (0x60 <= c && c < 0x80) { byte = c - 0x40; } // no inverse lowercase
|
|
} else if (curStyle === self.TEXT_STYLE_FLASH) {
|
|
if (0x20 <= c && c < 0x40) { byte = c + 0x40; }
|
|
else if (0x40 <= c && c < 0x60) { byte = c; }
|
|
else if (0x60 <= c && c < 0x80) { byte = c; } // no lowercase flash
|
|
} else {
|
|
if (0x20 <= c && c < 0x40) { byte = c + 0x80; }
|
|
else if (0x40 <= c && c < 0x60) { byte = c + 0x80; }
|
|
else if (0x60 <= c && c < 0x80) { byte = c + 0x80; }
|
|
}
|
|
}
|
|
}
|
|
setCellByte(x, y, byte);
|
|
}
|
|
|
|
this.reset = function _reset() {
|
|
this.hideCursor();
|
|
lineCallback = undefined;
|
|
charCallback = undefined;
|
|
|
|
inputBuffer = [];
|
|
keyboardRegister = 0;
|
|
buttonState = [0, 0, 0, 0];
|
|
|
|
}; // reset
|
|
|
|
function init(active, rows, columns) {
|
|
firmwareActive = active;
|
|
screenWidth = columns;
|
|
screenHeight = rows;
|
|
|
|
// Reset parameters
|
|
self.textWindow = {};
|
|
self.textWindow.left = 0;
|
|
self.textWindow.top = 0;
|
|
self.textWindow.width = screenWidth;
|
|
self.textWindow.height = screenHeight;
|
|
self.setTextStyle(self.TEXT_STYLE_NORMAL);
|
|
|
|
// Build character cell grid
|
|
var x, y, table, tbody, tr, td;
|
|
screenGrid = [];
|
|
screenGrid.length = screenWidth * screenHeight;
|
|
|
|
table = document.createElement('table');
|
|
table.className = 'tty_table';
|
|
|
|
tbody = document.createElement('tbody');
|
|
styleElem = tbody;
|
|
|
|
getClassList(styleElem).add(screenWidth === 40 ? 'tty_40col' : 'tty_80col');
|
|
if (firmwareActive) { getClassList(styleElem).add('active'); }
|
|
|
|
for (y = 0; y < screenHeight; y += 1) {
|
|
tr = document.createElement('tr');
|
|
tr.className = 'tty_tr';
|
|
tr.style.visibility = (y < splitPos) ? "hidden" : "";
|
|
screenRow[y] = tr;
|
|
|
|
for (x = 0; x < screenWidth; x += 1) {
|
|
td = document.createElement('td');
|
|
screenGrid[screenWidth * y + x] = {
|
|
elem: td
|
|
};
|
|
tr.appendChild(td);
|
|
}
|
|
|
|
tbody.appendChild(tr);
|
|
}
|
|
table.appendChild(tbody);
|
|
screenElement.innerHTML = "";
|
|
screenElement.appendChild(table);
|
|
|
|
self.clearScreen();
|
|
|
|
// Create cursor
|
|
cursorElement = document.createElement('span');
|
|
cursorElement.className = 'a2c a2c-cursor a2c255';
|
|
self.setCursorPosition(0, 0);
|
|
}
|
|
|
|
this.clearScreen = function _clearScreen() {
|
|
var x, y;
|
|
cursorX = self.textWindow.left;
|
|
cursorY = self.textWindow.top;
|
|
for (y = self.textWindow.top; y < self.textWindow.top + self.textWindow.height; y += 1) {
|
|
for (x = self.textWindow.left; x < self.textWindow.left + self.textWindow.width; x += 1) {
|
|
setCellChar(x, y, 0x20);
|
|
}
|
|
}
|
|
};
|
|
|
|
|
|
this.clearEOL = function _clearEOL() {
|
|
var x;
|
|
for (x = cursorX; x < self.textWindow.left + self.textWindow.width; x += 1) {
|
|
setCellChar(x, cursorY, 0x20);
|
|
}
|
|
};
|
|
|
|
|
|
this.setFirmwareActive = function _setFirmwareActive(active) {
|
|
init(active, 24, active ? 80 : 40);
|
|
};
|
|
|
|
|
|
function scrollUp() {
|
|
var x, y, cell;
|
|
|
|
for (y = self.textWindow.top; y < self.textWindow.top + self.textWindow.height - 1; y += 1) {
|
|
for (x = self.textWindow.left; x < self.textWindow.left + self.textWindow.width; x += 1) {
|
|
|
|
cell = screenGrid[x + screenWidth * (y + 1)];
|
|
setCellByte(x, y, cell.byte);
|
|
}
|
|
}
|
|
|
|
y = self.textWindow.top + (self.textWindow.height - 1);
|
|
for (x = self.textWindow.left; x < self.textWindow.left + self.textWindow.width; x += 1) {
|
|
setCellChar(x, y, 0x20);
|
|
}
|
|
}
|
|
|
|
function scrollDown() {
|
|
var x, y, cell;
|
|
|
|
for (y = self.textWindow.top + self.textWindow.height - 1; y > self.textWindow.top; y -= 1) {
|
|
for (x = self.textWindow.left; x < self.textWindow.left + self.textWindow.width; x += 1) {
|
|
|
|
cell = screenGrid[x + screenWidth * (y - 1)];
|
|
setCellByte(x, y, cell.byte);
|
|
}
|
|
}
|
|
|
|
y = self.textWindow.top;
|
|
for (x = self.textWindow.left; x < self.textWindow.left + self.textWindow.width; x += 1) {
|
|
setCellChar(x, y, 0x20);
|
|
}
|
|
}
|
|
|
|
this.scrollScreen = function _scrollScreen() {
|
|
scrollUp();
|
|
};
|
|
|
|
this.setTextStyle = function _setTextStyle(style) {
|
|
curStyle = style;
|
|
};
|
|
|
|
// Internal
|
|
function updateCursor() {
|
|
if (cursorVisible && cursorState) {
|
|
var elem = screenGrid[cursorY * screenWidth + cursorX].elem;
|
|
if (elem !== cursorElement.parentNode) {
|
|
elem.appendChild(cursorElement);
|
|
}
|
|
} else if (cursorElement.parentNode) {
|
|
cursorElement.parentNode.removeChild(cursorElement);
|
|
}
|
|
}
|
|
|
|
// Internal
|
|
function lineFeed() {
|
|
cursorY += 1;
|
|
if (cursorY >= self.textWindow.top + self.textWindow.height) {
|
|
cursorY = self.textWindow.top + self.textWindow.height - 1;
|
|
|
|
if (self.autoScroll) {
|
|
self.scrollScreen();
|
|
}
|
|
}
|
|
|
|
updateCursor();
|
|
}
|
|
|
|
// Internal
|
|
function advanceCursor() {
|
|
// Advance the cursor
|
|
cursorX += 1;
|
|
|
|
if (cursorX >= self.textWindow.left + self.textWindow.width) {
|
|
cursorX = self.textWindow.left;
|
|
lineFeed();
|
|
}
|
|
|
|
updateCursor();
|
|
}
|
|
|
|
// Hookable
|
|
this.writeChar = function _writeChar(c) {
|
|
var code = c.charCodeAt(0),
|
|
x, y;
|
|
|
|
switch (code) {
|
|
case 0:
|
|
case 1:
|
|
case 2:
|
|
case 3:
|
|
case 4: // DOS hook takes care of CHR$(4)
|
|
case 5:
|
|
case 6:
|
|
// no-op
|
|
break;
|
|
|
|
case 7: // (BEL) bell
|
|
if (bell) {
|
|
bell();
|
|
}
|
|
break;
|
|
|
|
case 8: // (BS) backspace
|
|
cursorX -= 1;
|
|
if (cursorX < self.textWindow.left) {
|
|
cursorX += self.textWindow.width;
|
|
cursorY -= 1;
|
|
if (cursorY < self.textWindow.top) {
|
|
cursorY = self.textWindow.top;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case 9:
|
|
break;
|
|
|
|
case 10: // (LF) line feed
|
|
lineFeed();
|
|
break;
|
|
|
|
case 11: // (VT) clear EOS
|
|
if (firmwareActive) {
|
|
// Clears from the cursor position to the end of the window
|
|
for (x = cursorX; x < self.textWindow.left + self.textWindow.width; x += 1) {
|
|
setCellChar(x, cursorY, 0x20);
|
|
}
|
|
for (y = cursorY + 1; y < self.textWindow.top + self.textWindow.height; y += 1) {
|
|
for (x = self.textWindow.left; x < self.textWindow.left + self.textWindow.width; x += 1) {
|
|
setCellChar(x, y, 0x20);
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
|
|
case 12: // (FF) clear
|
|
if (firmwareActive) {
|
|
// move cursor to upper left and clear window
|
|
self.clearScreen();
|
|
}
|
|
break;
|
|
|
|
case 13: // (CR) return
|
|
cursorX = self.textWindow.left;
|
|
lineFeed();
|
|
break;
|
|
|
|
case 14: // (SO) normal
|
|
if (firmwareActive) {
|
|
curStyle = self.TEXT_STYLE_NORMAL;
|
|
}
|
|
break;
|
|
|
|
case 15: // (SI) inverse
|
|
if (firmwareActive) {
|
|
curStyle = self.TEXT_STYLE_INVERSE;
|
|
}
|
|
break;
|
|
|
|
case 16:
|
|
break;
|
|
|
|
case 17: // (DC1) 40-column
|
|
if (firmwareActive) {
|
|
// set display to 40 columns
|
|
init(true, 24, 40);
|
|
}
|
|
break;
|
|
|
|
case 18: // (DC2) 80-column
|
|
if (firmwareActive) {
|
|
// set display to 80 columns
|
|
init(true, 24, 80);
|
|
}
|
|
break;
|
|
|
|
case 19: // (DC3) stop list
|
|
case 20:
|
|
break;
|
|
|
|
case 21: // (NAK) quit
|
|
if (firmwareActive) {
|
|
// deactivate, home, clear screen
|
|
init(false, 24, 40);
|
|
}
|
|
break;
|
|
|
|
case 22: // (SYN) scroll down
|
|
if (firmwareActive) {
|
|
// scroll display down, leaving cursor
|
|
scrollDown();
|
|
}
|
|
break;
|
|
|
|
case 23: // (ETB) scroll up
|
|
if (firmwareActive) {
|
|
// scroll display up, leaving cursor
|
|
scrollUp();
|
|
}
|
|
break;
|
|
|
|
case 24: // (CAN) disable mousetext
|
|
if (firmwareActive) {
|
|
// http://www.umich.edu/~archive/apple2/technotes/tn/mous/TN.MOUS.006
|
|
mousetext = false;
|
|
}
|
|
break;
|
|
|
|
case 25: // (EM) home
|
|
if (firmwareActive) {
|
|
// Moves cursor to upper-left corner of window (but doesn't clear)
|
|
cursorX = self.textWindow.left;
|
|
cursorY = self.textWindow.top;
|
|
}
|
|
break;
|
|
|
|
case 26: // (SUB) clear line
|
|
if (firmwareActive) {
|
|
// Clears the line the cursor position is on
|
|
for (x = 0; x < self.textWindow.width; x += 1) {
|
|
setCellChar(self.textWindow.left + x, cursorY, 0x20);
|
|
}
|
|
}
|
|
break;
|
|
|
|
case 27: // (ESC) enable mousetext
|
|
if (firmwareActive) {
|
|
// http://www.umich.edu/~archive/apple2/technotes/tn/mous/TN.MOUS.006
|
|
mousetext = true;
|
|
}
|
|
break;
|
|
|
|
case 28: // (FS) fwd. space
|
|
if (firmwareActive) {
|
|
// Moves cursor position one space to the right; from right edge
|
|
// of window, moves it to left end of line below
|
|
cursorX += 1;
|
|
if (cursorX > (self.textWindow.left + self.textWindow.width)) {
|
|
cursorX -= self.textWindow.width;
|
|
cursorY += 1;
|
|
if (cursorY > self.textWindow.top + self.textWindow.height) {
|
|
cursorY = self.textWindow.top + self.textWindow.height;
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
|
|
case 29: // (GS) clear EOL
|
|
if (firmwareActive) {
|
|
// Clear line rom cursor position to the right edge of the window
|
|
self.clearEOL();
|
|
}
|
|
break;
|
|
|
|
case 30: // RS - gotoXY (not supported from BASIC)
|
|
case 31:
|
|
break;
|
|
|
|
default:
|
|
setCellChar(cursorX, cursorY, code);
|
|
advanceCursor();
|
|
break;
|
|
}
|
|
};
|
|
|
|
// Hookable
|
|
this.writeString = function _writeString(s) {
|
|
var i;
|
|
for (i = 0; i < s.length; i += 1) {
|
|
this.writeChar(s.charAt(i));
|
|
}
|
|
};
|
|
|
|
this.getScreenSize = function _getScreenSize() {
|
|
return { width: screenWidth, height: screenHeight };
|
|
};
|
|
|
|
this.getCursorPosition = function _getCursorPosition() {
|
|
return { x: cursorX, y: cursorY };
|
|
};
|
|
|
|
this.setCursorPosition = function _setCursorPosition(x, y) {
|
|
if (x !== undefined) {
|
|
x = Math.min(Math.max(Math.floor(x), 0), screenWidth - 1);
|
|
} else {
|
|
x = cursorX;
|
|
}
|
|
|
|
if (y !== undefined) {
|
|
y = Math.min(Math.max(Math.floor(y), 0), screenHeight - 1);
|
|
} else {
|
|
y = cursorY;
|
|
}
|
|
|
|
if (x === cursorX && y === cursorY) {
|
|
// no-op
|
|
return;
|
|
}
|
|
|
|
cursorX = x;
|
|
cursorY = y;
|
|
updateCursor();
|
|
};
|
|
|
|
this.showCursor = function _showCursor() {
|
|
cursorVisible = true;
|
|
cursorInterval = setInterval(function() {
|
|
cursorState = !cursorState;
|
|
updateCursor();
|
|
}, 500);
|
|
};
|
|
|
|
this.hideCursor = function _hideCursor() {
|
|
clearInterval(cursorInterval);
|
|
cursorVisible = false;
|
|
updateCursor();
|
|
|
|
};
|
|
|
|
this.splitScreen = function _splitScreen(splitAt) {
|
|
splitPos = splitAt;
|
|
|
|
var y;
|
|
|
|
for (y = 0; y < screenHeight; y += 1) {
|
|
screenRow[y].style.visibility = (y < splitPos) ? "hidden" : "";
|
|
}
|
|
|
|
};
|
|
|
|
|
|
//
|
|
// Input
|
|
//
|
|
|
|
|
|
// Internal
|
|
function onKey(code) {
|
|
var cb, c, s;
|
|
|
|
keyboardRegister = code | 0x80;
|
|
|
|
if (charCallback) {
|
|
keyboardRegister = keyboardRegister & 0x7f;
|
|
|
|
cb = charCallback;
|
|
charCallback = undefined;
|
|
self.hideCursor();
|
|
cb(String.fromCharCode(code));
|
|
} else if (lineCallback) {
|
|
keyboardRegister = keyboardRegister & 0x7f;
|
|
|
|
if (code >= 32 && code <= 127) {
|
|
c = String.fromCharCode(code);
|
|
inputBuffer.push(c);
|
|
self.writeChar(c); // echo
|
|
} else {
|
|
switch (code) {
|
|
case 8: // Left Arrow
|
|
if (inputBuffer.length > 0) {
|
|
inputBuffer.pop();
|
|
self.setCursorPosition(Math.max(self.getCursorPosition().x - 1, 0), self.getCursorPosition().y);
|
|
}
|
|
break;
|
|
|
|
case 13: // Enter
|
|
// Respond to INPUT callback, if defined
|
|
s = inputBuffer.join("");
|
|
inputBuffer = [];
|
|
self.writeString("\r");
|
|
|
|
cb = lineCallback;
|
|
lineCallback = undefined;
|
|
self.hideCursor();
|
|
cb(s);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
// else: nothing - key stays in the keyboard register
|
|
|
|
} // onKey
|
|
|
|
function toAppleKey(e) {
|
|
|
|
function ord(c) { return c.charCodeAt(0); }
|
|
|
|
switch (e.keyName) {
|
|
|
|
// Non-Printables
|
|
case 'Backspace': return 127;
|
|
case 'Tab': return 9; // NOTE: Blocked elsewhere, for web page accessibility
|
|
case 'Enter': return 13;
|
|
case 'Escape': return 27;
|
|
case 'Left': return 8;
|
|
case 'Up': return 11;
|
|
case 'Right': return 21;
|
|
case 'Down': return 10;
|
|
case 'Delete': return 127;
|
|
case 'Clear': return 24; // ctrl-X - used on the IIgs
|
|
|
|
// Numeric
|
|
case '0':
|
|
case '1':
|
|
case '2':
|
|
case '3':
|
|
case '4':
|
|
case '5':
|
|
case '6':
|
|
case '7':
|
|
case '8':
|
|
case '9':
|
|
if (e.location === KeyboardEvent.DOM_KEY_LOCATION_NUMPAD) {
|
|
// Numpad, presumably - allow but nothing special
|
|
return ord(e.keyName);
|
|
} else if (e.ctrlKey) {
|
|
if (e.shiftKey) {
|
|
switch (e.keyName) {
|
|
case '2': return 0; // ctrl-@
|
|
case '6': return 30; // ctrl-^
|
|
}
|
|
}
|
|
return;
|
|
} else if (e.shiftKey) {
|
|
return ')!@#$%^&*('.charCodeAt(ord(e.keyName) - ord('0'));
|
|
} else {
|
|
return ord(e.keyName);
|
|
}
|
|
|
|
// Alphabetic
|
|
case 'A':
|
|
case 'B':
|
|
case 'C':
|
|
case 'D':
|
|
case 'E':
|
|
case 'F':
|
|
case 'G':
|
|
case 'H':
|
|
case 'I':
|
|
case 'J':
|
|
case 'K':
|
|
case 'L':
|
|
case 'M':
|
|
case 'N':
|
|
case 'O':
|
|
case 'P':
|
|
case 'Q':
|
|
case 'R':
|
|
case 'S':
|
|
case 'T':
|
|
case 'U':
|
|
case 'V':
|
|
case 'W':
|
|
case 'X':
|
|
case 'Y':
|
|
case 'Z':
|
|
if (e.ctrlKey) {
|
|
return ord(e.keyName) - 64; // Control keys, Apple II-style
|
|
} else if (capsLock || e.shiftKey) {
|
|
return ord(e.keyName); // Upper case
|
|
} else {
|
|
return ord(e.keyName) + 32; // Lower case
|
|
}
|
|
|
|
// Symbol and Punctuation
|
|
case 'Spacebar': return ord(' ');
|
|
case 'Semicolon': return e.shiftKey ? ord(':') : ord(';');
|
|
case 'Equals': return e.shiftKey ? ord('+') : ord('=');
|
|
case 'Comma': return e.shiftKey ? ord('<') : ord(',');
|
|
case 'Minus': return e.ctrlKey ? 31 : e.shiftKey ? ord('_') : ord('-');
|
|
case 'Period': return e.shiftKey ? ord('>') : ord('.');
|
|
case 'Solidus': return e.shiftKey ? ord('?') : ord('/');
|
|
case 'Grave': return e.shiftKey ? ord('~') : ord('`');
|
|
case 'LeftSquareBracket': return e.ctrlKey ? 27 : e.shiftKey ? ord('{') : ord('[');
|
|
case 'Backslash': return e.ctrlKey ? 28 : e.shiftKey ? ord('|') : ord('\\');
|
|
case 'RightSquareBracket': return e.ctrlKey ? 29 : e.shiftKey ? ord('}') : ord(']');
|
|
case 'Apostrophe': return e.shiftKey ? ord('"') : ord('\'');
|
|
|
|
// not present on Apple II keyboard
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
function isBrowserKey(e) {
|
|
return e.keyName === 'Tab' || e.keyName === 'F5' || e.metaKey;
|
|
}
|
|
|
|
|
|
// Internal
|
|
function handleKeyDown(e) {
|
|
identifyKey(e);
|
|
|
|
if (!e.keyName || isBrowserKey(e)) {
|
|
return true;
|
|
}
|
|
|
|
var handled = false, code;
|
|
|
|
switch (e.keyName) {
|
|
|
|
case 'CapsLock':
|
|
capsLock = !capsLock;
|
|
handled = true;
|
|
break;
|
|
|
|
// Used as paddle buttons (0=Open Apple, 1=Solid Apple)
|
|
case 'Home': buttonState[0] = 255; handled = true; break;
|
|
case 'End': buttonState[1] = 255; handled = true; break;
|
|
case 'PageUp': buttonState[2] = 255; handled = true; break;
|
|
case 'Shift': buttonState[2] = 255; handled = true; break;
|
|
case 'PageDown': buttonState[3] = 255; handled = true; break;
|
|
|
|
default:
|
|
code = toAppleKey(e);
|
|
if (code !== -1) {
|
|
keyDown = true;
|
|
onKey(code);
|
|
handled = true;
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (handled) {
|
|
e.stopPropagation();
|
|
e.preventDefault();
|
|
}
|
|
|
|
return !handled;
|
|
}
|
|
|
|
|
|
// Internal
|
|
function handleKeyUp(e) {
|
|
identifyKey(e);
|
|
|
|
if (!e.keyName || isBrowserKey(e)) {
|
|
return true;
|
|
}
|
|
|
|
var handled = false,
|
|
code;
|
|
|
|
switch (e.keyName) {
|
|
|
|
case 'CapsLock':
|
|
handled = true;
|
|
break;
|
|
|
|
// Used as paddle buttons (0=Open Apple, 1=Solid Apple)
|
|
case 'Home': buttonState[0] = 0; handled = true; break;
|
|
case 'End': buttonState[1] = 0; handled = true; break;
|
|
case 'PageUp': buttonState[2] = 0; handled = true; break;
|
|
case 'Shift': buttonState[2] = 0; handled = true; break;
|
|
case 'PageDown': buttonState[3] = 0; handled = true; break;
|
|
|
|
default:
|
|
code = toAppleKey(e);
|
|
if (code !== -1) {
|
|
keyDown = false;
|
|
handled = true;
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (handled) {
|
|
e.stopPropagation();
|
|
e.preventDefault();
|
|
}
|
|
|
|
return !handled;
|
|
}
|
|
|
|
|
|
this.getButtonState = function _getButtonState(btn) {
|
|
return buttonState[btn];
|
|
};
|
|
|
|
|
|
this.focus = function _focus() {
|
|
keyboardElement.focus();
|
|
};
|
|
|
|
|
|
// Hookable
|
|
this.readLine = function _readLine(callback, prompt) {
|
|
self.writeString(prompt);
|
|
|
|
lineCallback = callback;
|
|
self.showCursor();
|
|
self.focus();
|
|
};
|
|
|
|
|
|
// Hookable
|
|
this.readChar = function _readChar(callback) {
|
|
// If there is a key ready, deliver it immediately
|
|
if (keyboardRegister & 0x80) {
|
|
keyboardRegister = keyboardRegister & 0x7f;
|
|
|
|
// Non-blocking return
|
|
setTimeout(function() { callback(String.fromCharCode(keyboardRegister)); }, 0);
|
|
} else {
|
|
charCallback = callback;
|
|
self.showCursor();
|
|
self.focus();
|
|
}
|
|
};
|
|
|
|
|
|
this.getKeyboardRegister = function _getKeyboardRegister() {
|
|
return keyboardRegister;
|
|
};
|
|
|
|
|
|
this.clearKeyboardStrobe = function _clearKeyboardStrobe() {
|
|
keyboardRegister = keyboardRegister & 0x7f;
|
|
return keyboardRegister | (keyDown ? 0x80 : 0x00);
|
|
};
|
|
|
|
|
|
//
|
|
// Constructor Logic
|
|
//
|
|
|
|
|
|
init(false, 24, 40);
|
|
|
|
window.addEvent(keyboardElement, 'keydown', handleKeyDown);
|
|
window.addEvent(keyboardElement, 'keyup', handleKeyUp);
|
|
|
|
setInterval(function _blinkFlash() {
|
|
window.getClassList(styleElem).toggle('flash');
|
|
}, 250);
|
|
}
|
|
|
|
|