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shellinabox/demo/demo.jspp
zodiac c1e181ec98 Improved error handling. 
git-svn-id: https://shellinabox.googlecode.com/svn/trunk@107 0da03de8-d603-11dd-86c2-0f8696b7b6f9
2009-04-01 19:51:14 +00:00

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// Demo.js -- Demonstrate some of the features of ShellInABox
// Copyright (C) 2008-2009 Markus Gutschke <markus@shellinabox.com>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 2 as
// published by the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// In addition to these license terms, the author grants the following
// additional rights:
//
// If you modify this program, or any covered work, by linking or
// combining it with the OpenSSL project's OpenSSL library (or a
// modified version of that library), containing parts covered by the
// terms of the OpenSSL or SSLeay licenses, the author
// grants you additional permission to convey the resulting work.
// Corresponding Source for a non-source form of such a combination
// shall include the source code for the parts of OpenSSL used as well
// as that of the covered work.
//
// You may at your option choose to remove this additional permission from
// the work, or from any part of it.
//
// It is possible to build this program in a way that it loads OpenSSL
// libraries at run-time. If doing so, the following notices are required
// by the OpenSSL and SSLeay licenses:
//
// This product includes software developed by the OpenSSL Project
// for use in the OpenSSL Toolkit. (http://www.openssl.org/)
//
// This product includes cryptographic software written by Eric Young
// (eay@cryptsoft.com)
//
//
// The most up-to-date version of this program is always available from
// http://shellinabox.com
//
//
// Notes:
//
// The author believes that for the purposes of this license, you meet the
// requirements for publishing the source code, if your web server publishes
// the source in unmodified form (i.e. with licensing information, comments,
// formatting, and identifier names intact). If there are technical reasons
// that require you to make changes to the source code when serving the
// JavaScript (e.g to remove pre-processor directives from the source), these
// changes should be done in a reversible fashion.
//
// The author does not consider websites that reference this script in
// unmodified form, and web servers that serve this script in unmodified form
// to be derived works. As such, they are believed to be outside of the
// scope of this license and not subject to the rights or restrictions of the
// GNU General Public License.
//
// If in doubt, consult a legal professional familiar with the laws that
// apply in your country.
#define STATE_IDLE 0
#define STATE_INIT 1
#define STATE_PROMPT 2
#define STATE_READLINE 3
#define STATE_COMMAND 4
#define STATE_EVAL 5
#define STATE_EXEC 6
#define STATE_NEW_Y_N 7
#define TYPE_STRING 0
#define TYPE_NUMBER 1
#define TYPE_VAR 2
#define TYPE_STRVAR 3
#define TYPE_INTVAR 4
#define TYPE_ARR 5
#define TYPE_STRARR 6
#define TYPE_INTARR 7
function extend(subClass, baseClass) {
function inheritance() { }
inheritance.prototype = baseClass.prototype;
subClass.prototype = new inheritance();
subClass.prototype.constructor = subClass;
subClass.prototype.superClass = baseClass.prototype;
};
function Demo(container) {
this.superClass.constructor.call(this, container);
this.gotoState(STATE_INIT);
};
extend(Demo, VT100);
Demo.prototype.keysPressed = function(ch) {
if (this.state == STATE_EXEC) {
for (var i = 0; i < ch.length; i++) {
var c = ch.charAt(i);
if (c == '\u0003') {
this.keys = '';
this.error('Interrupted');
return;
}
}
}
this.keys += ch;
this.gotoState(this.state);
};
Demo.prototype.gotoState = function(state, tmo) {
this.state = state;
if (!this.timer || tmo) {
if (!tmo) {
tmo = 1;
}
this.nextTimer = setTimeout(function(demo) {
return function() {
demo.demo();
};
}(this), tmo);
}
};
Demo.prototype.demo = function() {
var done = false;
this.nextTimer = undefined;
while (!done) {
var state = this.state;
this.state = STATE_IDLE;
switch (state) {
case STATE_INIT:
done = this.doInit();
break;
case STATE_PROMPT:
done = this.doPrompt();
break;
case STATE_READLINE:
done = this.doReadLine();
break;
case STATE_COMMAND:
done = this.doCommand();
break;
case STATE_EVAL:
done = this.doEval();
break;
case STATE_EXEC:
done = this.doExec();
break;
case STATE_NEW_Y_N:
done = this.doNewYN();
break;
case STATE_IDLE:
default:
done = true;
break;
}
}
this.timer = this.nextTimer;
this.nextTimer = undefined;
};
Demo.prototype.ok = function() {
this.vt100('OK\r\n');
this.gotoState(STATE_PROMPT);
};
Demo.prototype.error = function(msg) {
if (msg == undefined) {
msg = 'Syntax Error';
}
this.vt100((this.cursorX != 0 ? '\r\n' : '') + '\u0007? ' + msg +
(this.currentLineIndex >= 0 ?
' in line ' + this.program[this.evalLineIndex].lineNumber() :
'') + '\r\n');
this.gotoState(STATE_PROMPT);
this.currentLineIndex = -1;
this.evalLineIndex = -1;
return undefined;
};
Demo.prototype.doInit = function() {
this.program = new Array();
this.vt100(
'\u001Bc\u001B[34;4m' +
'ShellInABox Demo Script\u001B[24;31m\r\n' +
'\r\n' +
'Copyright 2009 by Markus Gutschke <markus@shellinabox.com>\u001B[0m\r\n' +
'\r\n' +
'\r\n' +
'This script simulates a minimal BASIC interpreter, allowing you to\r\n' +
'experiment with the JavaScript terminal emulator that is part of\r\n' +
'the ShellInABox project.\r\n' +
'\r\n' +
'Type HELP for a list of commands.\r\n' +
'\r\n');
this.gotoState(STATE_PROMPT);
return false;
};
Demo.prototype.doPrompt = function() {
this.keys = '';
this.line = '';
this.currentLineIndex = -1;
this.evalLineIndex = -1;
this.vt100((this.cursorX != 0 ? '\r\n' : '') + '> ');
this.gotoState(STATE_READLINE);
return false;
};
Demo.prototype.doReadLine = function() {
this.gotoState(STATE_READLINE);
var keys = this.keys;
this.keys = '';
for (var i = 0; i < keys.length; i++) {
var ch = keys.charAt(i);
if (ch >= ' ' && ch < '\u007F' || ch > '\u00A0') {
this.line += ch;
this.vt100(ch);
} else if (ch == '\r' || ch == '\n') {
this.vt100('\r\n');
this.gotoState(STATE_COMMAND);
return false;
} else if (ch == '\u0008' || ch == '\u007F') {
if (this.line.length > 0) {
this.line = this.line.substr(0, this.line.length - 1);
if (this.cursorX == 0) {
var x = this.terminalWidth - 1;
var y = this.cursorY - 1;
this.gotoXY(x, y);
this.vt100(' ');
this.gotoXY(x, y);
} else {
this.vt100('\u0008 \u0008');
}
} else {
this.vt100('\u0007');
}
} else if (ch == '\u001B') {
// This was probably a function key. Just eat all of the following keys.
break;
}
}
return true;
};
Demo.prototype.doCommand = function() {
this.gotoState(STATE_PROMPT);
var tokens = new this.Tokens(this.line);
this.line = '';
var cmd = tokens.nextToken();
if (cmd) {
cmd = cmd;
if (cmd.match(/^[0-9]+$/)) {
tokens.removeLineNumber();
var lineNumber = parseInt(cmd);
var index = this.findLine(lineNumber);
if (tokens.nextToken() == null) {
if (index > 0) {
// Delete line from program
this.program.splice(index, 1);
}
} else {
if (index >= 0) {
// Replace line in program
this.program[index].setTokens(tokens);
} else {
// Add new line to program
this.program.splice(-index - 1, 0,
new this.Line(lineNumber, tokens));
}
}
} else {
this.currentLineIndex = -1;
this.evalLineIndex = -1;
this.tokens = tokens;
this.gotoState(STATE_EVAL);
}
}
tokens.reset();
return false;
};
Demo.prototype.doEval = function() {
this.gotoState(STATE_PROMPT);
var token = this.tokens.nextToken();
if (token == "HELP") {
this.vt100('Supported commands:\r\n' +
' HELP LIST NEW PRINT RUN\r\n');
} else if (token == "LIST") {
this.doList();
} else if (token == "NEW") {
if (this.currentLineIndex >= 0) {
this.error('Cannot call NEW from a program');
} else if (this.program.length == 0) {
this.ok();
} else {
this.vt100('Do you really want to delete the program (y/N) ');
this.gotoState(STATE_NEW_Y_N);
}
} else if (token == "PRINT" || token == "?") {
this.doPrint();
} else if (token == "RUN") {
if (this.tokens.peekToken() != null) {
this.error('RUN does not take any parameters');
} else if (this.program.length > 0) {
this.currentLineIndex = 0;
this.gotoState(STATE_EXEC);
} else {
this.ok();
}
} else {
this.error(token ? 'Unknown command: ' + token : undefined);
}
return false;
};
Demo.prototype.doList = function() {
var start = undefined;
var stop = undefined;
var token = this.tokens.nextToken();
if (token) {
if (!token.match(/[0-9]+/)) {
return this.error('LIST can optional take a start and stop line number');
}
start = parseInt(token);
token = this.tokens.nextToken();
if (token) {
if (token != ',') {
return this.error('Comma expected');
}
token = this.tokens.nextToken();
if (!token || !token.match(/[0-9]+/)) {
return this.error(
'LIST can optionally take a start and stop line number');
}
stop = token.parseInt(token);
if (stop < start) {
return this.error('Start line number has to come before stop');
}
}
}
for (var i = 0; i < this.program.length; i++) {
var line = this.program[i];
var lineNumber = line.lineNumber();
if (start != undefined && start > lineNumber) {
continue;
}
if (stop != undefined && stop < lineNumber) {
break;
}
this.vt100('' + line.lineNumber() + ' ');
line.tokens().reset();
var space = true;
var id = false;
for (var token; (token = line.tokens().nextToken()) != null; ) {
switch (token) {
case '=':
case '+':
case '-':
case '*':
case '/':
case '\\':
case '^':
this.vt100((space ? '' : ' ') + token + ' ');
space = true;
id = false;
break;
case '(':
case ')':
case '?':
case '$':
case '%':
case '#':
this.vt100(token);
space = false;
id = false;
break;
case ',':
case ';':
case ':':
this.vt100(token + ' ');
space = true;
id = false;
break;
default:
this.vt100((id ? ' ' : '') + token);
space = false;
id = true;
break;
}
}
this.vt100('\r\n');
}
};
Demo.prototype.doPrint = function() {
var tokens = this.tokens;
var last = undefined;
for (var token; (token = tokens.peekToken()); ) {
last = token;
if (token == ',') {
this.vt100('\t');
tokens.consume();
} else if (token == ';') {
// Do nothing
tokens.consume();
} else {
var value = this.expr();
if (value == undefined) {
return;
}
this.vt100(value.toString());
}
}
if (last != ';') {
this.vt100('\r\n');
}
};
Demo.prototype.doExec = function() {
this.evalLineIndex = this.currentLineIndex++;
this.tokens = this.program[this.evalLineIndex].tokens();
this.tokens.reset();
this.doEval();
if (this.currentLineIndex < 0) {
return false;
} else if (this.currentLineIndex >= this.program.length) {
this.ok();
return false;
} else {
this.gotoState(STATE_EXEC, 20);
return true;
}
};
Demo.prototype.doNewYN = function() {
for (var i = 0; i < this.keys.length; ) {
var ch = this.keys.charAt(i++);
if (ch == 'n' || ch == 'N' || ch == '\r' || ch == '\n') {
this.vt100('N\r\n');
this.keys = this.keys.substr(i);
this.error('Aborted');
return false;
} else if (ch == 'y' || ch == 'Y') {
this.vt100('Y\r\n');
this.program.splice(0, this.program.length);
this.keys = this.keys.substr(i);
this.ok();
return false;
} else {
this.vt100('\u0007');
}
}
this.gotoState(STATE_NEW_Y_N);
return true;
};
Demo.prototype.findLine = function(lineNumber) {
var l = 0;
var h = this.program.length;
while (h > l) {
var m = Math.floor((l + h) / 2);
var n = this.program[m].lineNumber();
if (n == lineNumber) {
return m;
} else if (n > lineNumber) {
h = m;
} else {
l = m + 1;
}
}
return -l - 1;
};
Demo.prototype.expr = function() {
var value = this.term();
while (value) {
var token = this.tokens.peekToken();
if (token != '+' && token != '-') {
break;
}
this.tokens.consume();
var v = this.term();
if (!v) {
return v;
}
if (value.type() != v.type()) {
if (value.type() != TYPE_STRING) {
value = new this.Value(TYPE_STRING, ''+value.val(), ''+value.val());
}
if (v.type() != TYPE_STRING) {
v = new this.Value(TYPE_STRING, ''+v.val(), ''+v.val());
}
}
if (token == '-') {
if (value.type() == TYPE_STRING) {
return this.error('Cannot subtract strings');
}
v = value.val() - v.val();
} else {
v = value.val() + v.val();
}
if (v == NaN) {
return this.error('Numeric range error');
}
value = new this.Value(value.type(), ''+v, v);
}
return value;
};
Demo.prototype.term = function() {
var value = this.factor();
while (value) {
var token = this.tokens.peekToken();
if (token != '*' && token != '/' && token != '\\') {
break;
}
this.tokens.consume();
var v = this.factor();
if (!v) {
return v;
}
if (value.type() != TYPE_NUMBER || v.type() != TYPE_NUMBER) {
return this.error('Cannot multiply or divide strings');
}
if (token == '*') {
v = value.val() * v.val();
} else {
v = value.val() / v.val();
if (token == '\\') {
if (v < 0) {
v = -Math.floor(-v);
} else {
v = Math.floor( v);
}
}
}
if (v == NaN) {
return this.error('Numeric range error');
}
value = new this.Value(TYPE_NUMBER, ''+v, v);
}
return value;
};
Demo.prototype.factor = function() {
var token = this.tokens.nextToken();
if (!token) {
return this.error();
}
var value = undefined;
var str;
if ((str = token.match(/^"(.*)"/)) != null) {
value = new this.Value(TYPE_STRING, str[1], str[1]);
} else if (token.match(/^[0-9]/)) {
var number;
if (token.match(/^[0-9]*$/)) {
number = parseInt(token);
} else {
number = parseFloat(token);
}
if (number == NaN) {
return this.error('Numeric range error');
}
value = new this.Value(TYPE_NUMBER, token, number);
} else {
return this.error();
}
return value;
};
Demo.prototype.Tokens = function(line) {
this.line = line;
this.tokens = line;
this.len = undefined;
};
Demo.prototype.Tokens.prototype.peekToken = function() {
this.len = undefined;
this.tokens = this.tokens.replace(/^[ \t]*/, '');
var tokens = this.tokens;
if (!tokens.length) {
return null;
}
var token = tokens.charAt(0);
switch (token) {
case '<':
if (tokens.length > 1) {
if (tokens.charAt(1) == '>') {
token = '<>';
} else if (tokens.charAt(1) == '=') {
token = '<=';
}
}
break;
case '>':
if (tokens.charAt(1) == '=') {
token = '>=';
}
break;
case '=':
case '+':
case '-':
case '*':
case '/':
case '\\':
case '^':
case '(':
case ')':
case '?':
case ',':
case ';':
case ':':
case '$':
case '%':
case '#':
break;
case '"':
token = tokens.match(/"((?:""|[^"])*)"/); // "
if (!token) {
token = undefined;
} else {
this.len = token[0].length;
token = '"' + token[1].replace(/""/g, '"') + '"';
}
break;
default:
if (token >= '0' && token <= '9' || token == '.') {
token = tokens.match(/^[0-9]*(?:[.][0-9]*)?(?:[eE][-+]?[0-9]+)?/);
if (!token) {
token = undefined;
} else {
token = token[0];
}
} else if (token >= 'A' && token <= 'Z' ||
token >= 'a' && token <= 'z') {
token = tokens.match(/^[A-Za-z][A-Za-z0-9_]*/);
if (!token) {
token = undefined;
} else {
token = token[0].toUpperCase();
}
} else {
token = '';
}
}
if (this.len == undefined) {
if (token) {
this.len = token.length;
} else {
this.len = 1;
}
}
return token;
};
Demo.prototype.Tokens.prototype.consume = function() {
if (this.len) {
this.tokens = this.tokens.substr(this.len);
this.len = undefined;
}
};
Demo.prototype.Tokens.prototype.nextToken = function() {
var token = this.peekToken();
this.consume();
return token;
};
Demo.prototype.Tokens.prototype.removeLineNumber = function() {
this.line = this.line.replace(/^[0-9]*[ \t]*/, '');
};
Demo.prototype.Tokens.prototype.reset = function() {
this.tokens = this.line;
};
Demo.prototype.Line = function(lineNumber, tokens) {
this.lineNumber_ = lineNumber;
this.tokens_ = tokens;
};
Demo.prototype.Line.prototype.lineNumber = function() {
return this.lineNumber_;
};
Demo.prototype.Line.prototype.tokens = function() {
return this.tokens_;
};
Demo.prototype.Line.prototype.setTokens = function(tokens) {
this.tokens_ = tokens;
};
Demo.prototype.Line.prototype.sort = function(a, b) {
return a.lineNumber_ - b.lineNumber_;
};
Demo.prototype.Value = function(type, str, val) {
this.t = type;
this.s = str;
this.v = val;
};
Demo.prototype.Value.prototype.type = function() {
return this.t;
};
Demo.prototype.Value.prototype.val = function() {
return this.v;
};
Demo.prototype.Value.prototype.toString = function() {
return this.s;
};
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