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index.mjs
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index.mjs
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import VM from './main.mjs';
const regsElement = document.getElementById('regs');
const flagsElement = document.getElementById('flags');
const dataElement = document.getElementById('data');
const stackElement = document.getElementById('stack');
const lineElement = document.getElementById('line');
const stopElement = document.getElementById('stop');
const runElement = document.getElementById('run');
const nextElement = document.getElementById('next');
const startElement = document.getElementById('start');
const codeElement = document.getElementById('code');
const cyclesElement = document.getElementById('cycles');
const toggleElement = document.getElementById('toggle');
const canvas = document.getElementById('output');
const resetBreakpoints = document.getElementById('resetBreakpoints');
const useBreakpoints = document.getElementById('break');
const linesElement = document.getElementById('lines');
const ctx = canvas.getContext('2d');
const width = 80;
const height = 25;
const fontSize = 15;
const lineHeight = 10;
let breakpoints = {};
let id = null;
let running = false;
let stopped = false;
canvas.width = `${fontSize * (width + 2)}`;
canvas.height = `${fontSize * (height + 2)}`;
const resetCanvas = () => {
ctx.fillStyle = 'black';
ctx.fillRect(0, 0, canvas.width, canvas.height);
};
const fillCanvas = text => {
ctx.font = `${fontSize}px consolas`;
ctx.fillStyle = 'white';
for (let y = 0; y < height; y++)
for (let x = 0; x < width; x++)
ctx.fillText(text[x + y * width], (x + 1) * fontSize, (y + 2) * fontSize);
};
const fillElementFromObject = (element, object) => {
element.value = '';
Object.keys(object).forEach(i => element.value += `${i} = ${object[i]}\n`);
};
const animateFrame = () => {
if ((useBreakpoints.checked && breakpoints[VM.lineNumber()]) || stopped) {
if (running) {
running = false;
stopped = true;
setRunButton(true);
clearInterval(id);
} else running = true;
}
if (running) stopped = false;
try {
if (running && VM.execLine()) {
running = false;
stopElement.style.display =
runElement.style.display =
nextElement.style.display = 'none';
} else {
fillElementFromObject(regsElement, VM.regs);
fillElementFromObject(flagsElement, VM.flags);
updateDataElement();
stackElement.value = VM.stack();
lineElement.value = VM.lineNumber();
codeElement.dispatchEvent(new Event('input'));
resetCanvas();
fillCanvas(VM.getText());
return;
}
} catch (e) {
alert('invalid code on line: ' + lineElement.value);
};
clearInterval(id);
};
const setRunButton = status => {
stopElement.style.display = status ? 'none' : 'initial';
runElement.style.display = status ? 'initial' : 'none';
};
const updateDataElement = () => dataElement.value = (toggleElement.checked ? VM.dataAsText : VM.data)();
const triggerCodeUpdate = () => codeElement.dispatchEvent(new Event('input'));
const toggleBreakpoint = line => line <= codeElement.value.split('\n').length && (breakpoints[line] = ~(breakpoints[line] | false)); // to be O(1)...
const triggerCodeUpdateNoBack = () => codeElement.dispatchEvent(new CustomEvent('input', {'detail': true}));
document.addEventListener('DOMContentLoaded', () => {
stopElement.addEventListener('click', () => {
clearInterval(id);
setRunButton(true);
});
startElement.addEventListener('click', () => {
regsElement.value =
flagsElement.value =
dataElement.value =
stackElement.value = '';
nextElement.style.display = 'initial';
startElement.innerText = 'Restart';
lineElement.value = 0;
clearInterval(id);
setRunButton(true);
resetCanvas();
triggerCodeUpdate();
VM.initSegments(codeElement.value);
running = true;
});
runElement.addEventListener('click', () => {
id = setInterval(animateFrame, cyclesElement.value);
setRunButton(false);
});
codeElement.addEventListener('input', e => {
const line = parseInt(lineElement.value);
const codeLines = codeElement.value.split('\n').length;
if(!e.isTrusted && !e.detail) codeElement.scrollTop = (line - 1) * codeElement.scrollHeight / codeLines;
linesElement.value = '';
[...Array(codeLines).keys()].forEach(index => {
if (index == line) linesElement.value += '-> ';
if (breakpoints[index]) linesElement.value += 'X ';
linesElement.value += index + '.\n';
});
linesElement.scrollTop = codeElement.scrollTop;
});
codeElement.addEventListener('drop', async e => {
e.preventDefault();
codeElement.style.backgroundColor = 'initial';
codeElement.value = await e.dataTransfer.files[0].text();
triggerCodeUpdate();
startElement.dispatchEvent(new Event('click'));
});
codeElement.addEventListener('keydown', e => {
if (e.key == 'Tab') {
e.preventDefault();
const start = codeElement.selectionStart;
const end = codeElement.selectionEnd;
codeElement.value = codeElement.value.substring(0, start) + '\t' + codeElement.value.substring(end);
codeElement.selectionStart = codeElement.selectionEnd = start + 1;
triggerCodeUpdate();
}
});
linesElement.addEventListener('click', e => {
toggleBreakpoint(Math.floor((e.clientY + linesElement.scrollTop - linesElement.offsetTop) / linesElement.style.lineHeight.slice(0, -2)));
triggerCodeUpdateNoBack();
});
resetBreakpoints.addEventListener('click', () => {
breakpoints = {};
triggerCodeUpdateNoBack();
});
document.addEventListener('keydown', e => {
if (e.ctrlKey && e.key.toLowerCase() == 's') {
e.preventDefault();
const link = document.createElement('a');
link.href = 'data:x-application/text,' + escape(codeElement.value);
link.download = 'download.asm';
link.click();
} else VM.updateLastKeyCode(e.key);
});
[...document.getElementsByTagName('textarea')].forEach(i => i.style.lineHeight = `${lineHeight}px`);
resetCanvas();
nextElement.addEventListener('click', animateFrame);
codeElement.addEventListener('scroll', () => linesElement.scrollTop = codeElement.scrollTop);
codeElement.addEventListener('dragenter', () => codeElement.style.backgroundColor = 'grey');
codeElement.addEventListener('dragleave', () => codeElement.style.backgroundColor = 'initial');
toggleElement.addEventListener('click', updateDataElement);
document.getElementById('font-size').addEventListener('input', () =>
[linesElement, codeElement].forEach(textarea =>
textarea.style.fontSize =
textarea.style.lineHeight = `${document.getElementById('font-size').value}px`
)
);
triggerCodeUpdate();
});