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lua.html
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lua.html
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<!doctype html>
<title>Lua interpreter</title>
<script src="../build/libv86.js"></script>
<script>
"use strict";
window.onload = function()
{
var emulator = new V86Starter({
memory_size: 32 * 1024 * 1024,
vga_memory_size: 2 * 1024 * 1024,
// Uncomment to see what's going on
//screen_container: document.getElementById("screen_container"),
bios: {
url: "../bios/seabios.bin",
},
vga_bios: {
url: "../bios/vgabios.bin",
},
cdrom: {
url: "../images/linux.iso",
},
autostart: true,
disable_keyboard: true,
});
var data = "";
emulator.add_listener("serial0-output-char", function(char)
{
if(char !== "\r")
{
data += char;
}
if(data.endsWith("login: "))
{
console.log("Do login");
emulator.serial0_send("root\n");
}
else if(data.endsWith("/root% "))
{
console.log("Now ready");
document.getElementById("status").textContent = "Ready.\n";
document.getElementById("run").disabled = false;
}
});
emulator.add_listener("serial0-output-line", function(line)
{
// filter noise
if(!line.startsWith("/root% lua -e") &&
!line.startsWith("> ") &&
line.indexOf("Welcome to Buildroot") === -1 &&
line.indexOf("login:") === -1 &&
line.trim() !== "")
{
document.getElementById("result").textContent += line;
}
});
document.getElementById("source").onkeydown = function(e)
{
if(e.which == 13 && e.ctrlKey)
{
document.getElementById("run").onclick();
}
};
document.getElementById("run").onclick = function()
{
var code = document.getElementById("source").value;
emulator.serial0_send("lua -e " + bashEscape(code) + "\n");
document.getElementById("result").textContent = "";
document.getElementById("status").textContent = "Running ...\n";
this.disabled = true;
};
};
// https://gist.github.com/creationix/2502704
// Implement bash string escaping.
function bashEscape(arg)
{
return "'" + arg.replace(/'+/g, function (val) {
return "'" + val.replace(/'/g, "\\'") + "'";
}) + "'";
}
</script>
<textarea id=source rows=20 cols=80>
k = 1
x = 0
while k < 1000 do
x = x + 1 / (k * k)
k = k + 2
end
print(math.sqrt(x*8))
function factorial(n)
if n == 0 then
return 1
else
return n * factorial(n - 1)
end
end
print("factorial(10):", factorial(10))
</textarea>
<button disabled id=run>run (ctrl-enter)</button>
<br>
<hr>
<pre id=status>Wait for boot ...</pre>
<pre id=result></pre>
<hr>
<div id="screen_container">
<div style="white-space: pre; font: 14px monospace; line-height: 14px"></div>
<canvas style="display: none"></canvas>
</div>