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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width" />
<title>exec</title>
</head>
<body>
<div style="width: 100%; text-align: center">
<span id="current" style="font-size: 80vh"></span>
<span id="raw"></span>
<br>
<span id="ascii"></span>
</div>
<script charset="utf-8">
const getCookieValue = name => document.cookie.match('(^|;)\\s*' + name + '\\s*=\\s*([^;]+)')?.pop() || ''
const current = document.getElementById("current")
const raw = document.getElementById("raw")
const ascii = document.getElementById("ascii")
const code = getCookieValue("code")
const ptr = +getCookieValue("ptr")
let addr = +document.location.pathname.substring(1)
const cell = new Uint8Array(1)
cell[0] = +getCookieValue("cell")
if (ptr >= code.length) {
alert("finished")
out = JSON.parse(getCookieValue("out"))
current.style.display = "none"
raw.innerText = out.join(", ")
ascii.innerText = out.map(x => String.fromCharCode(x)).join("")
throw new Error("byeee")
}
const lnext = () => {
let parity = 0
for (let i = ptr + 1; i < code.length; i++) {
if (parity == 0 && code[i] == ']') return i
else if (code[i] == ']') parity--
else if (code[i] == '[') parity++
}
alert("invalid code")
throw new Error("invalid code")
}
const lprev = () => {
let parity = 0
for (let i = ptr - 1; i >= 0; i--) {
if (parity == 0 && code[i] == '[') return i
else if (code[i] == '[') parity--
else if (code[i] == ']') parity++
}
alert("invalid code")
throw new Error("invalid code")
}
const exec = code[ptr]
current.innerText = exec;
switch(exec) {
case '>':
document.cookie = `ptr=${ptr+1}`
addr++
break
case '<':
document.cookie = `ptr=${ptr+1}`
addr--
break
case '+':
document.cookie = `ptr=${ptr+1}`
cell[0] += 1
document.cookie = `cell=${cell[0]}; path=/${addr}`
break
case '-':
document.cookie = `ptr=${ptr+1}`
cell[0] -= 1
document.cookie = `cell=${cell[0]}; path=/${addr}`
break
case '.':
document.cookie = `ptr=${ptr+1}`
const out = JSON.parse(getCookieValue("out"))
out.push(cell[0])
document.cookie = `out=${JSON.stringify(out)}; path=/`
break
case ',':
document.cookie = `ptr=${ptr+1}`
// TODO
const inp = "42"
document.cookie = `cell=${inp}; path=/${addr}`
break
case '[':
document.cookie = `ptr=${cell[0] == 0 ? lnext() + 1 : ptr + 1}`
break
case ']':
document.cookie = `ptr=${cell[0] != 0 ? lprev() + 1 : ptr + 1}`
break
default:
alert("invalid code")
throw new Error("invalid code")
}
window.location.replace(`/${addr}`)
</script>
</body>
</html>
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