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handleHTMLPage.js
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handleHTMLPage.js
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/*
* JSTMSimulator - A Turing Machine simulator written in JavaScript.
* Copyright (C) 2016 VittGam.net. All Rights Reserved.
* https://www.turingsimulator.net/
*
* See https://www.turingsimulator.net/github for source code.
*
* Please see the attached LICENSE file for licensing information.
*/
var currlang = lang.en;
try {
var browserLang = (window.navigator && (navigator.language || navigator.userLanguage || navigator.browserLanguage));
if (browserLang && lang[String(browserLang).substr(0, 2)]) {
currlang = lang[String(browserLang).substr(0, 2)];
}
browserLang = null;
} catch (e) {}
var turingMachineInstance = null;
var beforeUnloadWarningEnabled = false;
var currclass = null;
var ascending_character_class_warning = false;
var statusTimeout = null;
var drawTimeout = null;
var tickTimeout = null;
var tickSpeed = null;
var drawSpeed = null;
var speedToTimeoutMapping = [1500, 1350, 1200, 1050, 900, 750, 600, 450, 300, 150, 0, -1];
var statusDiv = document.getElementById('status');
var stateDiv = document.getElementById('state');
var usernameDiv = document.getElementById('username');
var codeTextarea = document.getElementById('code');
var inputBox = document.getElementById('input');
var tapeDiv = document.getElementById('tape');
var speedLabel = document.getElementById('speedlbl');
var speedSelect = document.getElementById('speed');
var startBtn = document.getElementById('startbtn');
var stopBtn = document.getElementById('stopbtn');
var progsSelect = document.getElementById('progs');
var loadBtn = document.getElementById('loadbtn');
var saveBtn = document.getElementById('savebtn');
var moveLeftBtn = document.getElementById('moveleft');
var moveRightBtn = document.getElementById('moveright');
var cells = [];
for (var i = 0; i < 31; i++) {
cells[i] = document.getElementById('cell' + i);
}
var textContentProp = ('textContent' in document.body ? 'textContent' : 'innerText');
var setTextContent = function(div, text){
if (div) {
div[textContentProp] = text;
}
};
startBtn.value = currlang.START_BUTTON;
stopBtn.value = currlang.STOP_BUTTON;
loadBtn.value = currlang.LOAD_BUTTON;
saveBtn.value = currlang.SAVE_BUTTON;
setTextContent(speedLabel, currlang.SPEED_LABEL);
var setstatus = function(text, dontcancel){
clearTimeout(statusTimeout);
setTextContent(statusDiv, text || '');
if (!dontcancel && text !== '') {
statusTimeout = setTimeout(function(){
setTextContent(statusDiv, '');
}, 5000);
}
};
var addEvent = function(elm, evt, func){
if (elm.addEventListener) {
elm.addEventListener(evt, func, false);
} else if (elm.attachEvent) {
elm.attachEvent('on' + (evt === 'change' ? 'propertychange' : evt), func);
}
};
var textareaSelectLine = function(currtextarea, linenumber){
try {
if (document.activeElement === speedSelect) {
return;
}
if (linenumber < 0) {
return;
}
var startpos = 0;
var endpos = 0;
var currtextareavalue = currtextarea.value.replace(new RegExp('(?:\r\n|\r)', 'g'), '\n');
var currtextareavaluelen = currtextareavalue.length;
for (var i = linenumber; i > 0; i--) {
startpos = currtextareavalue.indexOf('\n', startpos) + 1;
if (startpos === 0) {
return;
}
}
endpos = currtextareavalue.indexOf('\n', startpos);
if (typeof startpos !== 'number' || startpos < 0 || startpos > currtextareavaluelen) {
startpos = 0;
}
if (typeof endpos !== 'number' || endpos < 0 || endpos > currtextareavaluelen) {
endpos = currtextareavaluelen;
}
if (endpos <= startpos) {
return;
}
var textarealineheight = null;
if ((window.getComputedStyle && (textarealineheight = window.getComputedStyle(currtextarea, null))) || (document.defaultView && document.defaultView.getComputedStyle && (textarealineheight = document.defaultView.getComputedStyle(currtextarea, null)))) {
textarealineheight = parseInt(textarealineheight.getPropertyValue('line-height'), 10);
}
if (!textarealineheight) {
textarealineheight = parseInt((currtextarea.currentStyle || currtextarea.style || {}).lineHeight || 16, 10);
}
currtextarea.scrollTop = Math.max(0, linenumber * textarealineheight - (currtextarea.clientHeight - textarealineheight) / 2);
textarealineheight = null;
if (startpos === 0 && endpos === currtextareavaluelen && typeof currtextarea.select === 'function') {
currtextarea.select();
} else if (currtextarea.setSelectionRange) {
currtextarea.setSelectionRange(startpos, endpos);
} else if (currtextarea.createTextRange) {
var range = currtextarea.createTextRange();
range.collapse(true);
range.moveEnd('character', endpos);
range.moveStart('character', startpos);
range.select();
range = null;
}
window.setTimeout(function(){
currtextarea.scrollLeft = 0;
}, 0);
} catch (e) {}
};
var drawtape = function(){
var redraw = false;
if (currclass === 0) {
currclass = (turingMachineInstance.lastmove === '-' ? 3 : 1);
} else if (currclass === 1) {
currclass = 2;
redraw = true;
} else if (currclass === 2) {
currclass = 0;
} else if (currclass === 3) {
currclass = 4;
redraw = true;
} else if (currclass === 4) {
currclass = 0;
} else {
currclass = 0;
redraw = true;
}
if (redraw) {
for (var i = 0; i < 31; i++) {
setTextContent(cells[i], turingMachineInstance.tapetext.charAt(i + turingMachineInstance.tapepos - 15));
}
if (startBtn.disabled) {
textareaSelectLine(codeTextarea, turingMachineInstance.currtickline);
}
setTextContent(stateDiv, turingMachineInstance.currstate);
setstatus(currlang.STEPS_LABEL + ' ' + turingMachineInstance.stepcount, true);
}
var newClassName = [];
if (currclass === 1 || currclass === 2) {
newClassName.push('anim' + currclass);
}
if (currclass === 2) {
if (turingMachineInstance.lastmove === '<') {
newClassName.push('movedleft');
} else if (turingMachineInstance.lastmove === '>') {
newClassName.push('movedright');
}
}
newClassName = newClassName.join(' ');
if (tapeDiv.className !== newClassName) {
tapeDiv.className = newClassName;
}
newClassName = null;
if (currclass === 0 && turingMachineInstance.stopped) {
setstatus(currlang.STOPPED + ' ' + currlang.STEPS_LABEL + ' ' + turingMachineInstance.stepcount, true);
currclass = null;
codeTextarea.readOnly = inputBox.disabled = startBtn.disabled = progsSelect.disabled = loadBtn.disabled = saveBtn.disabled = false;
return;
}
drawTimeout = setTimeout(drawtape, drawSpeed);
};
var setspeed = function(){
tickSpeed = speedToTimeoutMapping[speedSelect.selectedIndex];
if (tickSpeed === -1) {
tickSpeed = 0;
drawSpeed = 130;
} else {
drawSpeed = tickSpeed / 3;
}
};
var start = function(){
turingMachineInstance = new TuringMachine({
code: codeTextarea.value,
tapetext: inputBox.value,
onaftertick: function(){
tickTimeout = setTimeout(turingMachineInstance.tick, tickSpeed);
},
onprestart: function(){
codeTextarea.readOnly = inputBox.disabled = startBtn.disabled = progsSelect.disabled = loadBtn.disabled = saveBtn.disabled = true;
beforeUnloadWarningEnabled = true;
currclass = null;
clearTimeout(drawTimeout);
clearTimeout(tickTimeout);
},
onstart: function(){
setstatus();
stopBtn.disabled = false;
setspeed();
codeTextarea.focus();
drawtape();
},
onstop: function(){
stopBtn.disabled = true;
currclass = null;
drawtape();
},
onerror: function(obj){
stopBtn.disabled = true;
clearTimeout(drawTimeout);
clearTimeout(tickTimeout);
setstatus((obj.errorType === 'syntax' ? String(currlang.SYNTAX_ERROR_LABEL).replace('%d', obj.errorLine + 1) : currlang.UNKNOWN_ERROR_LABEL) + ' ' + currlang[obj.errorMessage]);
currclass = null;
codeTextarea.readOnly = inputBox.disabled = startBtn.disabled = progsSelect.disabled = loadBtn.disabled = saveBtn.disabled = false;
codeTextarea.focus();
textareaSelectLine(codeTextarea, obj.errorLine);
},
onwarning: function(warning){
if (warning === 'WARNING_ASCENDING_CHARACTER_CLASS') {
if (!ascending_character_class_warning) {
ascending_character_class_warning = true;
alert(currlang.WARNING_ASCENDING_CHARACTER_CLASS + '\n\n' + currlang.WARNING_WONT_BE_SHOWN_AGAIN);
}
} else {
alert(currlang[warning] || warning);
}
}
});
turingMachineInstance.start();
};
var preventSelectTo = [stateDiv, usernameDiv, speedLabel, statusDiv, tapeDiv, moveLeftBtn, moveRightBtn];
var selectPreventerEvent = ('onselectstart' in document.body ? 'selectstart' : 'mousedown');
var selectPreventerFunc = function(e){
if (!e) {
e = window.event;
}
if (e.preventDefault) {
e.preventDefault();
}
return false;
};
for (var j = 0; j < preventSelectTo.length; j++) {
addEvent(preventSelectTo[j], selectPreventerEvent, selectPreventerFunc);
}
preventSelectTo = selectPreventerEvent = selectPreventerFunc = null;
addEvent(startBtn, 'click', start);
addEvent(stopBtn, 'click', function(){
stopBtn.disabled = true;
if (turingMachineInstance) {
turingMachineInstance.stop();
}
});
addEvent(moveLeftBtn, 'click', function(){
if (turingMachineInstance && turingMachineInstance.stopped && !startBtn.disabled) {
turingMachineInstance.tapepos++;
currclass = null;
drawtape();
}
});
addEvent(moveRightBtn, 'click', function(){
if (turingMachineInstance && turingMachineInstance.stopped && !startBtn.disabled) {
turingMachineInstance.tapepos--;
currclass = null;
drawtape();
}
});
addEvent(speedSelect, 'change', function(e, v){
setspeed();
this.blur();
});
window.onbeforeunload = function(){
if (beforeUnloadWarningEnabled || codeTextarea.value !== '') {
return currlang.EXIT_CONFIRMATION;
}
};
codeTextarea.disabled = codeTextarea.readOnly = inputBox.disabled = speedSelect.disabled = startBtn.disabled = progsSelect.disabled = loadBtn.disabled = saveBtn.disabled = false;