60b5f38d74
git-svn-id: https://shellinabox.googlecode.com/svn/trunk@120 0da03de8-d603-11dd-86c2-0f8696b7b6f9
1175 lines
33 KiB
Text
1175 lines
33 KiB
Text
// Demo.js -- Demonstrate some of the features of ShellInABox
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// Copyright (C) 2008-2009 Markus Gutschke <markus@shellinabox.com>
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License version 2 as
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// published by the Free Software Foundation.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with this program; if not, write to the Free Software Foundation, Inc.,
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// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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//
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// In addition to these license terms, the author grants the following
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// additional rights:
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//
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// If you modify this program, or any covered work, by linking or
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// combining it with the OpenSSL project's OpenSSL library (or a
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// modified version of that library), containing parts covered by the
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// terms of the OpenSSL or SSLeay licenses, the author
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// grants you additional permission to convey the resulting work.
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// Corresponding Source for a non-source form of such a combination
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// shall include the source code for the parts of OpenSSL used as well
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// as that of the covered work.
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//
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// You may at your option choose to remove this additional permission from
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// the work, or from any part of it.
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//
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// It is possible to build this program in a way that it loads OpenSSL
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// libraries at run-time. If doing so, the following notices are required
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// by the OpenSSL and SSLeay licenses:
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//
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// This product includes software developed by the OpenSSL Project
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// for use in the OpenSSL Toolkit. (http://www.openssl.org/)
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//
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// This product includes cryptographic software written by Eric Young
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// (eay@cryptsoft.com)
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//
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//
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// The most up-to-date version of this program is always available from
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// http://shellinabox.com
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//
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//
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// Notes:
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//
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// The author believes that for the purposes of this license, you meet the
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// requirements for publishing the source code, if your web server publishes
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// the source in unmodified form (i.e. with licensing information, comments,
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// formatting, and identifier names intact). If there are technical reasons
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// that require you to make changes to the source code when serving the
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// JavaScript (e.g to remove pre-processor directives from the source), these
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// changes should be done in a reversible fashion.
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//
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// The author does not consider websites that reference this script in
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// unmodified form, and web servers that serve this script in unmodified form
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// to be derived works. As such, they are believed to be outside of the
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// scope of this license and not subject to the rights or restrictions of the
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// GNU General Public License.
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//
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// If in doubt, consult a legal professional familiar with the laws that
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// apply in your country.
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#define STATE_IDLE 0
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#define STATE_INIT 1
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#define STATE_PROMPT 2
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#define STATE_READLINE 3
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#define STATE_COMMAND 4
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#define STATE_EXEC 5
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#define STATE_NEW_Y_N 6
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#define TYPE_STRING 0
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#define TYPE_NUMBER 1
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function extend(subClass, baseClass) {
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function inheritance() { }
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inheritance.prototype = baseClass.prototype;
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subClass.prototype = new inheritance();
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subClass.prototype.constructor = subClass;
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subClass.prototype.superClass = baseClass.prototype;
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};
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function Demo(container) {
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this.superClass.constructor.call(this, container);
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this.gotoState(STATE_INIT);
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};
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extend(Demo, VT100);
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Demo.prototype.keysPressed = function(ch) {
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for (var i = 0; i < ch.length; i++) {
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var c = ch.charCodeAt(i);
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if (c == 3) {
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if (this.state == STATE_EXEC) {
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this.keys = '';
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this.error('Interrupted');
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return;
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}
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} else {
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if (c < 128) {
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this.keys += String.fromCharCode(c);
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} else if (c < 0x800) {
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this.keys += String.fromCharCode(0xC0 + (c >> 6) ) +
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String.fromCharCode(0x80 + ( c & 0x3F));
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} else if (c < 0x10000) {
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this.keys += String.fromCharCode(0xE0 + (c >> 12) ) +
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String.fromCharCode(0x80 + ((c >> 6) & 0x3F)) +
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String.fromCharCode(0x80 + ( c & 0x3F));
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} else if (c < 0x110000) {
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this.keys += String.fromCharCode(0xF0 + (c >> 18) ) +
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String.fromCharCode(0x80 + ((c >> 12) & 0x3F)) +
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String.fromCharCode(0x80 + ((c >> 6) & 0x3F)) +
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String.fromCharCode(0x80 + ( c & 0x3F));
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}
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}
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}
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this.gotoState(this.state);
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};
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Demo.prototype.gotoState = function(state, tmo) {
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this.state = state;
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if (!this.timer || tmo) {
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if (!tmo) {
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tmo = 1;
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}
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this.nextTimer = setTimeout(function(demo) {
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return function() {
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demo.demo();
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};
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}(this), tmo);
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}
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};
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Demo.prototype.demo = function() {
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var done = false;
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this.nextTimer = undefined;
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while (!done) {
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var state = this.state;
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this.state = STATE_PROMPT;
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switch (state) {
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case STATE_INIT:
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done = this.doInit();
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break;
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case STATE_PROMPT:
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done = this.doPrompt();
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break;
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case STATE_READLINE:
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done = this.doReadLine();
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break;
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case STATE_COMMAND:
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done = this.doCommand();
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break;
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case STATE_EXEC:
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done = this.doExec();
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break;
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case STATE_NEW_Y_N:
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done = this.doNewYN();
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break;
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default:
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done = true;
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break;
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}
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}
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this.timer = this.nextTimer;
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this.nextTimer = undefined;
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};
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Demo.prototype.ok = function() {
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this.vt100('OK\r\n');
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this.gotoState(STATE_PROMPT);
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};
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Demo.prototype.error = function(msg) {
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if (msg == undefined) {
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msg = 'Syntax Error';
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}
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this.vt100((this.cursorX != 0 ? '\r\n' : '') + '\u0007? ' + msg +
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(this.currentLineIndex >= 0 ?
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' in line ' + this.program[this.evalLineIndex].lineNumber() :
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'') + '\r\n');
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this.gotoState(STATE_PROMPT);
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this.currentLineIndex = -1;
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this.evalLineIndex = -1;
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return undefined;
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};
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Demo.prototype.doInit = function() {
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this.vars = new Object();
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this.program = new Array();
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this.vt100(
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'\u001Bc\u001B[34;4m' +
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'ShellInABox Demo Script\u001B[24;31m\r\n' +
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'\r\n' +
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'Copyright 2009 by Markus Gutschke <markus@shellinabox.com>\u001B[0m\r\n' +
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'\r\n' +
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'\r\n' +
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'This script simulates a minimal BASIC interpreter, allowing you to\r\n' +
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'experiment with the JavaScript terminal emulator that is part of\r\n' +
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'the ShellInABox project.\r\n' +
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'\r\n' +
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'Type HELP for a list of commands.\r\n' +
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'\r\n');
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this.gotoState(STATE_PROMPT);
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return false;
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};
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Demo.prototype.doPrompt = function() {
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this.keys = '';
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this.line = '';
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this.currentLineIndex = -1;
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this.evalLineIndex = -1;
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this.vt100((this.cursorX != 0 ? '\r\n' : '') + '> ');
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this.gotoState(STATE_READLINE);
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return false;
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};
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Demo.prototype.doReadLine = function() {
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this.gotoState(STATE_READLINE);
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var keys = this.keys;
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this.keys = '';
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for (var i = 0; i < keys.length; i++) {
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var ch = keys.charAt(i);
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if (ch >= ' ') {
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this.line += ch;
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this.vt100(ch);
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} else if (ch == '\r' || ch == '\n') {
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this.vt100('\r\n');
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this.gotoState(STATE_COMMAND);
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return false;
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} else if (ch == '\u0008' || ch == '\u007F') {
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if (this.line.length > 0) {
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this.line = this.line.substr(0, this.line.length - 1);
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if (this.cursorX == 0) {
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var x = this.terminalWidth - 1;
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var y = this.cursorY - 1;
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this.gotoXY(x, y);
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this.vt100(' ');
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this.gotoXY(x, y);
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} else {
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this.vt100('\u0008 \u0008');
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}
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} else {
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this.vt100('\u0007');
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}
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} else if (ch == '\u001B') {
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// This was probably a function key. Just eat all of the following keys.
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break;
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}
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}
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return true;
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};
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Demo.prototype.doCommand = function() {
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this.gotoState(STATE_PROMPT);
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var tokens = new this.Tokens(this.line);
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this.line = '';
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var cmd = tokens.nextToken();
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if (cmd) {
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cmd = cmd;
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if (cmd.match(/^[0-9]+$/)) {
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tokens.removeLineNumber();
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var lineNumber = parseInt(cmd);
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var index = this.findLine(lineNumber);
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if (tokens.nextToken() == null) {
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if (index > 0) {
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// Delete line from program
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this.program.splice(index, 1);
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}
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} else {
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tokens.reset();
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if (index >= 0) {
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// Replace line in program
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this.program[index].setTokens(tokens);
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} else {
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// Add new line to program
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this.program.splice(-index - 1, 0,
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new this.Line(lineNumber, tokens));
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}
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}
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} else {
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this.currentLineIndex = -1;
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this.evalLineIndex = -1;
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tokens.reset();
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this.tokens = tokens;
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return this.doEval();
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}
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}
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return false;
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};
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Demo.prototype.doEval = function() {
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var token = this.tokens.peekToken();
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if (token == "DIM") {
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this.tokens.consume();
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this.doDim();
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} else if (token == "END") {
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this.tokens.consume();
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this.doEnd();
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} else if (token == "GOTO") {
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this.tokens.consume();
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this.doGoto();
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} else if (token == "HELP") {
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this.tokens.consume();
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if (this.tokens.nextToken() != undefined) {
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this.error('HELP does not take any arguments');
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} else {
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this.vt100('Supported commands:\r\n' +
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'DIM END GOTO HELP LET LIST NEW PRINT RUN\r\n'+
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'\r\n'+
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'Supported functions:\r\n'+
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'ABS() ASC() ATN() CHR$() COS() EXP() INT() LEFT$() LEN()\r\n'+
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'LOG() MID$() POS() RIGHT$() RND() SGN() SIN() SPC() SQR()\r\n'+
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'STR$() TAB() TAN() TI VAL()\r\n');
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}
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} else if (token == "LET") {
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this.tokens.consume();
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this.doAssignment();
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} else if (token == "LIST") {
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this.tokens.consume();
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this.doList();
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} else if (token == "NEW") {
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this.tokens.consume();
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if (this.tokens.nextToken() != undefined) {
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this.error('NEW does not take any arguments');
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} else if (this.currentLineIndex >= 0) {
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this.error('Cannot call NEW from a program');
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} else if (this.program.length == 0) {
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this.ok();
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} else {
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this.vt100('Do you really want to delete the program (y/N) ');
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this.gotoState(STATE_NEW_Y_N);
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}
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} else if (token == "PRINT" || token == "?") {
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this.tokens.consume();
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this.doPrint();
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} else if (token == "RUN") {
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this.tokens.consume();
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if (this.tokens.nextToken() != null) {
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this.error('RUN does not take any parameters');
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} else if (this.program.length > 0) {
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this.currentLineIndex = 0;
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this.vars = new Object();
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this.gotoState(STATE_EXEC);
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} else {
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this.ok();
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}
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} else {
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this.doAssignment();
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}
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return false;
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};
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Demo.prototype.arrayIndex = function() {
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var token = this.tokens.peekToken();
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var arr = '';
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if (token == '(') {
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this.tokens.consume();
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do {
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var idx = this.expr();
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if (idx == undefined) {
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return idx;
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} else if (idx.type() != TYPE_NUMBER) {
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return this.error('Numeric value expected');
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}
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idx = Math.floor(idx.val());
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if (idx < 0) {
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return this.error('Indices have to be positive');
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}
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arr += ',' + idx;
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token = this.tokens.nextToken();
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} while (token == ',');
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if (token != ')') {
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return this.error('")" expected');
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}
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}
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return arr;
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};
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Demo.prototype.toInt = function(v) {
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if (v < 0) {
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return -Math.floor(-v);
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} else {
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return Math.floor( v);
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}
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};
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Demo.prototype.doAssignment = function() {
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var id = this.tokens.nextToken();
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if (!id || !id.match(/^[A-Za-z][A-Za-z0-9_]*$/)) {
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return this.error('Identifier expected');
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}
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var token = this.tokens.peekToken();
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var isString = false;
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var isInt = false;
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if (token == '$') {
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isString = true;
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this.tokens.consume();
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} else if (token == '%') {
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isInt = true;
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this.tokens.consume();
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}
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var arr = this.arrayIndex();
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if (arr == undefined) {
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return arr;
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}
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token = this.tokens.nextToken();
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if (token != '=') {
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return this.error('"=" expected');
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}
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var value = this.expr();
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if (value == undefined) {
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return value;
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}
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if (isString) {
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if (value.type() != TYPE_STRING) {
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return this.error('String expected');
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}
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this.vars['str_' + id + arr] = value;
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} else {
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if (value.type() != TYPE_NUMBER) {
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return this.error('Numeric value expected');
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}
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if (isInt) {
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value = this.toInt(value.val());
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value = new this.Value(TYPE_NUMBER, '' + value, value);
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this.vars['int_' + id + arr] = value;
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} else {
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this.vars['var_' + id + arr] = value;
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}
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}
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};
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Demo.prototype.doDim = function() {
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for (;;) {
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var token = this.tokens.nextToken();
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if (token == undefined) {
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return;
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}
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if (!token || !token.match(/^[A-Za-z][A-Za-z0-9_]*$/)) {
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return this.error('Identifier expected');
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}
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token = this.tokens.nextToken();
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if (token == '$' || token == '%') {
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token = this.tokens.nextToken();
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}
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if (token != '(') {
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return this.error('"(" expected');
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}
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do {
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var size = this.expr();
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if (!size) {
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return size;
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}
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if (size.type() != TYPE_NUMBER) {
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return this.error('Numeric value expected');
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}
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if (Math.floor(size.val()) < 1) {
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return this.error('Range error');
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}
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token = this.tokens.nextToken();
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} while (token == ',');
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if (token != ')') {
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return this.error('")" expected');
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}
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if (this.tokens.peekToken() != ',') {
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break;
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}
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this.tokens.consume();
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}
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if (this.tokens.peekToken() != undefined) {
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return this.error();
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}
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};
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Demo.prototype.doEnd = function() {
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if (this.evalLineIndex < 0) {
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return this.error('Cannot use END interactively');
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}
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if (this.tokens.nextToken() != undefined) {
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return this.error('END does not take any arguments');
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}
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this.currentLineIndex = this.program.length;
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};
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Demo.prototype.doGoto = function() {
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if (this.evalLineIndex < 0) {
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return this.error('Cannot use GOTO interactively');
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}
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var value = this.expr();
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if (value == undefined) {
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return;
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}
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if (value.type() != TYPE_NUMBER) {
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return this.error('Numeric value expected');
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}
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if (this.tokens.nextToken() != undefined) {
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return this.error('GOTO takes exactly one numeric argument');
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}
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var number = this.toInt(value.val());
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if (number <= 0) {
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return this.error('Range error');
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}
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var idx = this.findLine(number);
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if (idx < 0) {
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return this.error('No line number ' + line);
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}
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this.currentLineIndex = idx;
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};
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Demo.prototype.doList = function() {
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var start = undefined;
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var stop = undefined;
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var token = this.tokens.nextToken();
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if (token) {
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if (token != '-' && !token.match(/[0-9]+/)) {
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return this.error('LIST can optional take a start and stop line number');
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}
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if (token != '-') {
|
|
start = parseInt(token);
|
|
token = this.tokens.nextToken();
|
|
}
|
|
if (!token) {
|
|
stop = start;
|
|
} else {
|
|
if (token != '-') {
|
|
return this.error('Dash expected');
|
|
}
|
|
token = this.tokens.nextToken();
|
|
if (token) {
|
|
if (!token.match(/[0-9]+/)) {
|
|
return this.error(
|
|
'LIST can optionally take a start and stop line number');
|
|
}
|
|
stop = parseInt(token);
|
|
if (start && stop < start) {
|
|
return this.error('Start line number has to come before stop');
|
|
}
|
|
}
|
|
if (this.tokens.peekToken()) {
|
|
return this.error('Unexpected trailing arguments');
|
|
}
|
|
}
|
|
}
|
|
|
|
var listed = false;
|
|
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;
|
|
}
|
|
|
|
listed = true;
|
|
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 '#':
|
|
this.vt100(token);
|
|
space = false;
|
|
id = false;
|
|
break;
|
|
case ',':
|
|
case ';':
|
|
case ':':
|
|
this.vt100(token + ' ');
|
|
space = true;
|
|
id = false;
|
|
break;
|
|
case '?':
|
|
token = 'PRINT';
|
|
// fall thru
|
|
default:
|
|
this.vt100((id ? ' ' : '') + token);
|
|
space = false;
|
|
id = true;
|
|
break;
|
|
}
|
|
}
|
|
this.vt100('\r\n');
|
|
}
|
|
if (!listed) {
|
|
this.ok();
|
|
}
|
|
};
|
|
|
|
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.currentLineIndex = -1;
|
|
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.vars = new Object();
|
|
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.expn();
|
|
while (value) {
|
|
var token = this.tokens.peekToken();
|
|
if (token != '*' && token != '/' && token != '\\') {
|
|
break;
|
|
}
|
|
this.tokens.consume();
|
|
var v = this.expn();
|
|
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 == '\\') {
|
|
v = this.toInt(v);
|
|
}
|
|
}
|
|
if (v == NaN) {
|
|
return this.error('Numeric range error');
|
|
}
|
|
value = new this.Value(TYPE_NUMBER, ''+v, v);
|
|
}
|
|
return value;
|
|
};
|
|
|
|
Demo.prototype.expn = function() {
|
|
var value = this.intrinsic();
|
|
var token = this.tokens.peekToken();
|
|
if (token == '^') {
|
|
this.tokens.consume();
|
|
var exp = this.intrinsic();
|
|
if (exp == undefined || exp.val() == NaN) {
|
|
return exp;
|
|
}
|
|
if (value.type() != TYPE_NUMBER || exp.type() != TYPE_NUMBER) {
|
|
return this.error("Numeric value expected");
|
|
}
|
|
var v = Math.pow(value.val(), exp.val());
|
|
value = new this.Value(TYPE_NUMBER, '' + v, v);
|
|
}
|
|
return value;
|
|
};
|
|
|
|
Demo.prototype.intrinsic = function() {
|
|
var token = this.tokens.peekToken();
|
|
var args = undefined;
|
|
var value, v, fnc, arg1, arg2, arg3;
|
|
if (!token) {
|
|
return this.error('Unexpected end of input');
|
|
} else if (token.match(/^(?:ABS|ASC|ATN|CHR\$|COS|EXP|INT|LEN|LOG|POS|RND|SGN|SIN|SPC|SQR|STR\$|TAB|TAN|VAL)$/)) {
|
|
fnc = token;
|
|
args = 1;
|
|
} else if (token.match(/^(?:LEFT\$|RIGHT\$)$/)) {
|
|
fnc = token;
|
|
args = 2;
|
|
} else if (token == 'MID$') {
|
|
fnc = token;
|
|
args = 3;
|
|
} else if (token == 'TI') {
|
|
this.tokens.consume();
|
|
v = (new Date()).getTime() / 1000.0;
|
|
return new this.Value(TYPE_NUMBER, '' + v, v);
|
|
} else {
|
|
return this.factor();
|
|
}
|
|
this.tokens.consume();
|
|
token = this.tokens.nextToken();
|
|
if (token != '(') {
|
|
return this.error('"(" expected');
|
|
}
|
|
arg1 = this.expr();
|
|
if (!arg1) {
|
|
return arg1;
|
|
}
|
|
token = this.tokens.nextToken();
|
|
if (--args) {
|
|
if (token != ',') {
|
|
return this.error('"," expected');
|
|
}
|
|
arg2 = this.expr();
|
|
if (!arg2) {
|
|
return arg2;
|
|
}
|
|
token = this.tokens.nextToken();
|
|
if (--args) {
|
|
if (token != ',') {
|
|
return this.error('"," expected');
|
|
}
|
|
arg3 = this.expr();
|
|
if (!arg3) {
|
|
return arg3;
|
|
}
|
|
token = this.tokens.nextToken();
|
|
}
|
|
}
|
|
if (token != ')') {
|
|
return this.error('")" expected');
|
|
}
|
|
switch (fnc) {
|
|
case 'ASC':
|
|
if (arg1.type() != TYPE_STRING || arg1.val().length < 1) {
|
|
return this.error('Non-empty string expected');
|
|
}
|
|
v = arg1.val().charCodeAt(0);
|
|
value = new this.Value(TYPE_NUMBER, '' + v, v);
|
|
break;
|
|
case 'LEN':
|
|
if (arg1.type() != TYPE_STRING) {
|
|
return this.error('String expected');
|
|
}
|
|
v = arg1.val().length;
|
|
value = new this.Value(TYPE_NUMBER, '' + v, v);
|
|
break;
|
|
case 'LEFT$':
|
|
if (arg1.type() != TYPE_STRING || arg2.type() != TYPE_NUMBER ||
|
|
arg2.type() < 0) {
|
|
return this.error('Invalid arguments');
|
|
}
|
|
v = arg1.val().substr(0, Math.floor(arg2.val()));
|
|
value = new this.Value(TYPE_STRING, v, v);
|
|
break;
|
|
case 'MID$':
|
|
if (arg1.type() != TYPE_STRING || arg2.type() != TYPE_NUMBER ||
|
|
arg3.type() != TYPE_NUMBER || arg2.val() < 0 || arg3.val() < 0) {
|
|
return this.error('Invalid arguments');
|
|
}
|
|
v = arg1.val().substr(Math.floor(arg2.val()),
|
|
Math.floor(arg3.val()));
|
|
value = new this.Value(TYPE_STRING, v, v);
|
|
break;
|
|
case 'RIGHT$':
|
|
if (arg1.type() != TYPE_STRING || arg2.type() != TYPE_NUMBER ||
|
|
arg2.type() < 0) {
|
|
return this.error('Invalid arguments');
|
|
}
|
|
v = Math.floor(arg2.val());
|
|
if (v > arg1.val().length) {
|
|
v = arg1.val().length;
|
|
}
|
|
v = arg1.val().substr(arg1.val().length - v);
|
|
value = new this.Value(TYPE_STRING, v, v);
|
|
break;
|
|
case 'STR$':
|
|
value = new this.Value(TYPE_STRING, arg1.toString(),
|
|
arg1.toString());
|
|
break;
|
|
case 'VAL':
|
|
if (arg1.type() == TYPE_NUMBER) {
|
|
value = arg1;
|
|
} else {
|
|
if (arg1.val().match(/^[0-9]+$/)) {
|
|
v = parseInt(arg1.val());
|
|
} else {
|
|
v = parseFloat(arg1.val());
|
|
}
|
|
value = new this.Value(TYPE_NUMBER, '' + v, v);
|
|
}
|
|
break;
|
|
default:
|
|
if (arg1.type() != TYPE_NUMBER) {
|
|
return this.error('Numeric value expected');
|
|
}
|
|
switch (fnc) {
|
|
case 'CHR$':
|
|
if (arg1.val() < 0 || arg1.val() > 65535) {
|
|
return this.error('Invalid Unicode range');
|
|
}
|
|
v = String.fromCharCode(arg1.val());
|
|
value = new this.Value(TYPE_STRING, v, v);
|
|
break;
|
|
case 'SPC':
|
|
if (arg1.val() < 0) {
|
|
return this.error('Range error');
|
|
}
|
|
v = arg1.val() >= 1 ?
|
|
'\u001B[' + Math.floor(arg1.val()) + 'C' : '';
|
|
value = new this.Value(TYPE_STRING, v, v);
|
|
break;
|
|
case 'TAB':
|
|
if (arg1.val() < 0) {
|
|
return this.error('Range error');
|
|
}
|
|
v = '\r' + (arg1.val() >= 1 ?
|
|
'\u001B[' + (Math.floor(arg1.val())*8) + 'C' : '');
|
|
value = new this.Value(TYPE_STRING, v, v);
|
|
break;
|
|
default:
|
|
switch (fnc) {
|
|
case 'ABS': v = Math.abs(arg1.val()); break;
|
|
case 'ATN': v = Math.atan(arg1.val()); break;
|
|
case 'COS': v = Math.cos(arg1.val()); break;
|
|
case 'EXP': v = Math.exp(arg1.val()); break;
|
|
case 'INT': v = Math.floor(arg1.val()); break;
|
|
case 'LOG': v = Math.log(arg1.val()); break;
|
|
case 'POS': v = this.cursorX; break;
|
|
case 'SGN': v = arg1.val() < 0 ? -1 : arg1.val() ? 1 : 0; break;
|
|
case 'SIN': v = Math.sin(arg1.val()); break;
|
|
case 'SQR': v = Math.sqrt(arg1.val()); break;
|
|
case 'TAN': v = Math.tan(arg1.val()); break;
|
|
case 'RND':
|
|
if (this.prng == undefined) {
|
|
this.prng = 1013904223;
|
|
}
|
|
if (arg1.type() == TYPE_NUMBER && arg1.val() < 0) {
|
|
this.prng = Math.floor(1664525*arg1.val()) & 0xFFFFFFFF;
|
|
}
|
|
if (arg1.type() != TYPE_NUMBER || arg1.val() != 0) {
|
|
this.prng = Math.floor(1664525*this.prng + 1013904223) &
|
|
0xFFFFFFFF;
|
|
}
|
|
v = ((this.prng & 0x7FFFFFFF) / 65536.0) / 32768;
|
|
break;
|
|
}
|
|
value = new this.Value(TYPE_NUMBER, '' + v, v);
|
|
}
|
|
}
|
|
if (v == NaN) {
|
|
return this.error('Numeric range error');
|
|
}
|
|
return value;
|
|
};
|
|
|
|
Demo.prototype.factor = function() {
|
|
var token = this.tokens.nextToken();
|
|
var value;
|
|
if (token == '-') {
|
|
value = this.expr();
|
|
if (!value) {
|
|
return value;
|
|
}
|
|
if (value.type() != TYPE_NUMBER) {
|
|
return this.error('Numeric value expected');
|
|
}
|
|
return new this.Value(TYPE_NUMBER, '' + -value.val(), -value.val());
|
|
}
|
|
if (!token) {
|
|
return this.error();
|
|
}
|
|
if (token == '(') {
|
|
value = this.expr();
|
|
token = this.tokens.nextToken();
|
|
if (token != ')' && value != undefined) {
|
|
return this.error('")" expected');
|
|
}
|
|
} else {
|
|
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]*$/)) {
|
|
number = parseInt(token);
|
|
} else {
|
|
number = parseFloat(token);
|
|
}
|
|
if (number == NaN) {
|
|
return this.error('Numeric range error');
|
|
}
|
|
value = new this.Value(TYPE_NUMBER, token, number);
|
|
} else if (token.match(/^[A-Za-z][A-Za-z0-9_]*$/)) {
|
|
if (this.tokens.peekToken() == '$') {
|
|
this.tokens.consume();
|
|
var arr= this.arrayIndex();
|
|
if (arr == undefined) {
|
|
return arr;
|
|
}
|
|
value = this.vars['str_' + token + arr];
|
|
if (value == undefined) {
|
|
value= new this.Value(TYPE_STRING, '', '');
|
|
}
|
|
} else {
|
|
var n = 'var_';
|
|
if (this.tokens.peekToken() == '%') {
|
|
this.tokens.consume();
|
|
n = 'int_';
|
|
}
|
|
var arr= this.arrayIndex();
|
|
if (arr == undefined) {
|
|
return arr;
|
|
}
|
|
value = this.vars[n + token + arr];
|
|
if (value == undefined) {
|
|
value= new this.Value(TYPE_NUMBER, '0', 0);
|
|
}
|
|
}
|
|
} else {
|
|
return this.error();
|
|
}
|
|
}
|
|
|
|
return value;
|
|
};
|
|
|
|
Demo.prototype.Tokens = function(line) {
|
|
this.line = line;
|
|
this.tokens = line;
|
|
this.len = undefined;
|
|
};
|
|
|
|
Demo.prototype.Tokens.prototype.peekToken = function() {
|
|
this.len = undefined;
|
|
this.tokens = this.tokens.replace(/^[ \t]*/, '');
|
|
var tokens = this.tokens;
|
|
if (!tokens.length) {
|
|
return null;
|
|
}
|
|
var token = tokens.charAt(0);
|
|
switch (token) {
|
|
case '<':
|
|
if (tokens.length > 1) {
|
|
if (tokens.charAt(1) == '>') {
|
|
token = '<>';
|
|
} else if (tokens.charAt(1) == '=') {
|
|
token = '<=';
|
|
}
|
|
}
|
|
break;
|
|
case '>':
|
|
if (tokens.charAt(1) == '=') {
|
|
token = '>=';
|
|
}
|
|
break;
|
|
case '=':
|
|
case '+':
|
|
case '-':
|
|
case '*':
|
|
case '/':
|
|
case '\\':
|
|
case '^':
|
|
case '(':
|
|
case ')':
|
|
case '?':
|
|
case ',':
|
|
case ';':
|
|
case ':':
|
|
case '$':
|
|
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(/^(?:CHR\$|STR\$|LEFT\$|RIGHT\$|MID\$)/i);
|
|
if (token) {
|
|
token = token[0].toUpperCase();
|
|
} else {
|
|
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;
|
|
};
|
|
|