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// Connection and playback state are independent of renderer initialization.
const program = document.getElementById("program");
const status = document.getElementById("status");
let socket;
let renderer;
let layout;
let rendererReady = false;
let rendering = false;
let frames = [];
let current = -1;
let generation = 0;
let done = false;
let compiling = false;
let connection = "Connecting to compiler...";
let failure = "";
let busy = "";
function updateUI() {
status.textContent = failure || (connection !== "Connected" ? connection :
!rendererReady ? "Connected; initializing graph renderer..." :
busy ? busy : compiling ? "Compiling... " + frames.length + " frames received" :
done ? frames.length + " frames ready" : "Connected");
document.getElementById("N").textContent = current < 0 ? "0" : String(current + 1);
document.getElementById("len").textContent = String(frames.length);
document.getElementById("doPrev").disabled = rendering || current <= 0;
document.getElementById("doNext").disabled =
!rendererReady || rendering || current + 1 >= frames.length;
document.getElementById("compile").disabled =
!socket || socket.readyState !== WebSocket.OPEN || compiling || rendering;
document.getElementById("fit").disabled = rendering || current < 0;
document.getElementById("save").disabled = rendering || !frames[current]?.snap;
document.getElementById("assocs").disabled = !frames[current]?.snap;
document.getElementById("near").disabled = !frames[current]?.evt;
const evt = frames[current]?.evt;
let label = "";
if (evt) {
const text = evt.kind === "PHASE" ? "Phase complete" :
evt.kind === "BEFORE" ? `Before peephole #${evt.peep} at node #${evt.node}` :
evt.kind === "RETURN" ? `Return #${evt.repl} for #${evt.node}` :
!evt.repl ? `Removed #${evt.node}` : evt.repl === evt.node ? `Updated #${evt.node}` :
`Replaced #${evt.node} with #${evt.repl}`;
label = `${evt.phase} · ${text}${evt.up ? " (inside peephole #" + evt.up + ")" : ""}`;
}
document.getElementById("event").textContent = label;
}
function reportError(error) {
failure = "Viewer error: " + (error && error.message || error || "Graph rendering failed");
rendering = false;
busy = "";
updateUI();
console.error(error);
}
// Surface startup failures instead of leaving a permanent "Connecting..." label.
window.addEventListener("error", event => reportError(event.error || event.message));
window.addEventListener("unhandledrejection", event => reportError(event.reason));
function get_program() {
if (!socket || socket.readyState !== WebSocket.OPEN) {
connection = "Compiler is not connected. Start make view and use its new tab.";
updateUI();
return;
}
if (compiling || rendering) return;
generation++;
frames = [];
current = -1;
done = false;
compiling = true;
failure = "";
document.getElementById("detail").hidden = true;
updateUI();
socket.send(program.value);
}
async function render(index) {
if (!rendererReady || rendering || index < 0 || index >= frames.length) return;
const frameGeneration = generation;
rendering = true;
const frame = frames[index];
busy = frame.snap && !frame.layout ? "Laying out frame " + (index + 1) + "..." : "Drawing...";
updateUI();
if (frame.pos >= 0) program.setSelectionRange(frame.pos, frame.pos + 1);
try {
document.getElementById("elk").hidden = !frame.snap;
document.getElementById("dot").hidden = !!frame.snap;
if (frame.snap) {
if (!layout) layout = new GraphLayout();
if (!frame.layout) frame.layout = await layout.run(frame.snap);
if (generation === frameGeneration) renderer.show(frame.snap, frame.layout, frame.evt);
} else {
document.getElementById("detail").hidden = true;
await drawDot(frame.dot);
}
rendering = false;
busy = "";
if (generation === frameGeneration) current = index;
updateUI();
} catch (error) {
reportError(error);
}
}
function doNext() { render(current + 1); }
function doPrev() { render(current - 1); }
function doExit() {
if (socket && socket.readyState === WebSocket.OPEN) socket.send("null");
}
program.value = "return 0;";
program.addEventListener("keydown", event => {
if (event.key === "Enter" && (event.ctrlKey || event.metaKey)) {
event.preventDefault();
get_program();
}
});
document.getElementById("compile").addEventListener("click", get_program);
document.getElementById("fit").addEventListener("click", () => {
if (frames[current]?.snap) { renderer.auto = true; renderer.fit(); }
else render(current);
});
document.getElementById("assocs").addEventListener("change", event => renderer.assocs(event.target.checked));
document.getElementById("near").addEventListener("change", () => renderer.mark());
document.getElementById("save").addEventListener("click", () => renderer.save(frames[current].snap.step));
document.addEventListener("keydown", event => {
if (event.key === "Escape") renderer.select(0);
});
try {
renderer = new GraphView(document.getElementById("elk"));
rendererReady = true;
socket = new WebSocket("ws://" + (location.hostname || "127.0.0.1") + ":12345");
socket.onopen = () => {
connection = "Connected";
updateUI();
};
socket.onmessage = event => {
const message = event.data;
if (message === "!") {
get_program();
} else if (message === "#") {
done = true;
compiling = false;
updateUI();
} else if (message.startsWith("{") || message.startsWith("digraph")) {
let frame;
try {
if (message.startsWith("{")) {
frame = JSON.parse(message);
if (frame.snap.ver !== 1) throw new Error("Unsupported graph version: " + frame.snap.ver);
} else {
// Earlier chapters still send bare DOT.
const pos = message.match(/\/\/ POS:\s*(\d+)/);
frame = {dot: message, pos: pos ? Number(pos[1]) : -1};
}
} catch (error) {
reportError(error);
return;
}
frames.push(frame);
socket.send("+");
updateUI();
if (frames.length === 1) render(0);
} else {
reportError("Unexpected compiler response: " + message);
}
};
socket.onclose = () => {
compiling = false;
connection = "Compiler disconnected. Restart make view and use its new tab.";
updateUI();
};
socket.onerror = () => {
connection = "Cannot connect to the compiler. Check the make view terminal.";
updateUI();
};
window.addEventListener("resize", () => {
if (current >= 0 && !frames[current].snap) render(current);
});
} catch (error) {
reportError(error);
}
updateUI();
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