moth/www/res/terminal.js

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JavaScript
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function tx(element, text, bps) {
var drawTimer;
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var displayed = "";
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function draw() {
c = text[0];
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displayed += c;
element.textContent = displayed;
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text = text.substr(1);
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if (text.length == 0) {
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clearInterval(drawTimer);
return;
}
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if (element.parentNode.lastChild == element) {
element.scrollIntoView();
}
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}
// N81 uses 1 stop bit, and 1 parity bit.
// That works out to exactly 10 bits per byte.
msec = 10000 / bps;
drawTimer = setInterval(draw, msec);
draw();
}
function Terminal(target, bps) {
bps = bps || 1200;
var outq = [];
var outTimer;
function drawElement() {
var next = outq.shift();
var out = document.createElement(next[0]);
target.appendChild(out);
tx(out, next[1], bps);
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console.log(outq.length);
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if (outq.length == 0) {
clearInterval(outTimer);
}
}
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this.clear = function() {
while (target.firstChild) {
target.removeChild(target.firstChild);
}
}
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this.enqueue = function(tag, txt) {
outq.push([tag, txt]);
if (! outTimer) {
outTimer = setInterval(drawElement, 150);
}
}
this.par = function(txt) {
this.enqueue("p", txt);
}
this.pre = function(txt) {
this.enqueue("pre", txt);
}
}
//
// Usage:
//
// var e = Terminal(document.getElementById("output"));
// e.output("This is a paragraph. It has sentences.");
// e.output("This is a second paragraph.");
//