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script.js
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script.js
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// initialize variables
const registers = [0, 0, 0, 0, 0, 0, 0, 0]
const instructions = {
nop: -1,
isz: 0,
inc: 1,
dec: 2,
jmp: 3,
stp: 4,
}
const states = {
inactive: 0,
running: 1,
paused: 2,
stopped: 3,
failure: 4,
}
let instructionCounter = 0
const program = [[-1], [-1], [-1], [-1], [-1]]
let instructionPointer = 0;
let numberOfInstructionFields = 5
let status = 0
let timer
updateInstructionPointer()
setUpRegisterListeners()
updateRegisterFields()
document.getElementById("stepButton").disabled = false
document.getElementById("runButton").disabled = false
document.getElementById("resumeButton").disabled = true
document.getElementById("stopButton").disabled = true
document.getElementById("pauseButton").disabled = true
setUpListeners(document.getElementsByClassName('address'))
setUpListeners(document.getElementsByClassName('command'))
document.getElementById('file-input').addEventListener('change', handleFileSelect, false);
// ui-functions
function reset() {
instructionPointer = 0
instructionCounter = 0
status = 0
updateInstructionPointer()
}
function reload() {
location.reload()
}
// multi-step
function run() {
document.getElementById("stepButton").disabled = true
document.getElementById("runButton").disabled = true
document.getElementById("resumeButton").disabled = true
document.getElementById("stopButton").disabled = false
document.getElementById("pauseButton").disabled = false
stepTime = document.getElementById("delay").value
status = 1;
timer = setInterval(function(){ step(); }, stepTime);
}
// single-step
function step() {
if (status == states.paused) {
return false
}
if (instructionPointer >= program.length || instructionPointer+1 === numberOfInstructionFields) {
status = states.failure
clearInterval(timer)
document.getElementById("stepButton").disabled = false
document.getElementById("runButton").disabled = false
document.getElementById("resumeButton").disabled = true
document.getElementById("stopButton").disabled = true
document.getElementById("pauseButton").disabled = true
return false
}
const [instruction, register] = program[instructionPointer]
switch (instruction) {
case instructions.nop:
instructionPointer++
instructionCounter++
break
case instructions.isz:
instructionPointer++
instructionCounter++
if (registers[register] === 0) {
instructionPointer++
instructionCounter++
}
break
case instructions.inc:
registers[register]++
instructionPointer++
instructionCounter++
break
case instructions.dec:
registers[register]--
instructionPointer++
instructionCounter++
break
case instructions.jmp:
instructionPointer = register
instructionCounter++
break
case instructions.stp:
status = states.stopped
document.getElementById("stepButton").disabled = false
document.getElementById("runButton").disabled = false
document.getElementById("resumeButton").disabled = true
document.getElementById("stopButton").disabled = true
document.getElementById("pauseButton").disabled = true
clearInterval(timer)
return false
break
default:
break
}
updateInstructionPointer()
updateRegisterFields()
return true
}
// setup functions
function setUpListeners(elements) {
for (let i = 0; i < elements.length; i++) {
elements[i].addEventListener('change', updateArray, false)
}
}
function setUpRegisterListeners() {
registerElements = document.getElementsByClassName("register")
for (let i = 0; i < registers.length; i++) {
registerElements[i].addEventListener('change', updateRegisters, false)
}
}
function updateArray(event) {
const elem = event.target
const trow = elem.parentNode.parentNode
const index = Array.prototype.indexOf.call(trow.parentNode.childNodes, trow)
if (program[index] === undefined)
program[index] = [instructions.nop]
//console.log(trow.parentNode.childNodes)
//console.log(elem.tagName, index, program)
program[index][elem.tagName === "INPUT" ? 1 : 0] = parseInt(elem.value, 10)
const diff = numberOfInstructionFields-index
if(diff < 5)
expandFields(index, 5-diff)
}
function expandFields(index, diff) {
// Find a <table> element with id="myTable":
var table = document.getElementById("main");
for (var i = index; i < index+diff; i++) {
// Create an empty <tr> element and add it to the 1st position of the table:
var row = table.insertRow(numberOfInstructionFields+1)
// Insert new cells (<td> elements) at the 1st - 4th position of the "new" <tr> element:
var cell1 = row.insertCell(0)
var cell2 = row.insertCell(1)
var cell3 = row.insertCell(2)
var cell4 = row.insertCell(3)
row.className = "instruction"
cell1.className = "command_col"
cell2.className = "address_col"
cell3.className = "line_col"
cell4.className = "pointer_col"
// Add html to new cells:
cell1.innerHTML = "<select class='command form-control'><option value=-1 selected='selected'></option><option value=0>isz</option><option value=1>inc</option><option value=2>dec</option><option value=3>jmp</option><option value=4>stp</option></select>"
cell2.innerHTML = "<input type='number' min=0 class='address form-control'/>"
cell3.innerHTML = numberOfInstructionFields
cell4.innerHTML = " "
// add change listeners
setUpNewListeners(row)
// expand array
if (program[numberOfInstructionFields] === undefined)
program[numberOfInstructionFields] = [instructions.nop]
// increase
numberOfInstructionFields++
}
}
function setUpNewListeners(row) {
row.getElementsByTagName('input')[0].addEventListener('change', updateArray, false)
row.getElementsByTagName('select')[0].addEventListener('change', updateArray, false)
}
function updateInstructionPointer() {
const arrow = document.getElementsByClassName("arrow")[0]
const boundingRectParent = document.getElementsByClassName("line_col")[0].getBoundingClientRect()
const boundingRectNeighbor = document.getElementsByClassName("line_col")[1].getBoundingClientRect()
const boundingRectArrow = arrow.getBoundingClientRect()
const containerOffset = document.getElementsByClassName("container")[0].getBoundingClientRect().left
const navBarOffset = document.getElementsByClassName("navbar")[0].getBoundingClientRect().bottom
const horizontalDiff = boundingRectParent.top - boundingRectNeighbor.top
const leftOffset = boundingRectParent.right - containerOffset
const topOffset = boundingRectParent.top + (boundingRectArrow.top-boundingRectArrow.bottom)/2 - horizontalDiff * instructionPointer - navBarOffset
arrow.style.left = leftOffset + "px"
arrow.style.top = topOffset + "px"
}
function updateRegisters(event) {
const elem = event.target
const trow = elem.parentNode.parentNode
const index = Array.prototype.indexOf.call(trow.parentNode.childNodes, trow)
registers[index] = parseInt(elem.value, 10)
}
function updateRegisterFields() {
registerElements = document.getElementsByClassName("register")
for (let i = 0; i < registers.length; i++) {
registerElements[i].value = registers[i]
}
}
function handleFileSelect(evt) {
var file = evt.target.files[0]; // FileList object
var fr = new FileReader();
fr.onload = parse;
fr.readAsText(file);
function parse()
{
lines = fr.result.split("\n")
if ((((lines.length-1) - numberOfInstructionFields + 4) > 0)) {
expandFields(numberOfInstructionFields, ((lines.length-1) - numberOfInstructionFields + 4))
numberOfInstructionFields += ((lines.length-1) - numberOfInstructionFields + 4)
}
for (var i = 0; i < lines.length-1; i++) {
commands = lines[i].split(" ")
program[i] = [parseInt(commands[0]), parseInt(commands[1])]
document.getElementsByClassName("command")[i].value = commands[0]
document.getElementsByClassName("address")[i].value = commands[1]
}
}
}
function download() {
let content = ""
for (var i = 0; i < program.length-4; i++) {
content += (program[i][0] + " " + program[i][1])
content += "\n"
}
uriContent = "data:application/octet-stream," + encodeURIComponent(content)
newWindow = window.open(uriContent, "_self");
}
function pause() {
status = states.paused
document.getElementById("stepButton").disabled = true
document.getElementById("runButton").disabled = true
document.getElementById("resumeButton").disabled = false
document.getElementById("stopButton").disabled = false
document.getElementById("pauseButton").disabled = true
}
function resume() {
status = states.running
document.getElementById("stepButton").disabled = true
document.getElementById("runButton").disabled = true
document.getElementById("resumeButton").disabled = true
document.getElementById("stopButton").disabled = false
document.getElementById("pauseButton").disabled = false
}
function stop() {
status = states.stopped
clearInterval(timer)
document.getElementById("stepButton").disabled = false
document.getElementById("runButton").disabled = false
document.getElementById("resumeButton").disabled = true
document.getElementById("stopButton").disabled = true
document.getElementById("pauseButton").disabled = true
}