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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 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 = "";
function updateUI() {
status.textContent = failure || (connection !== "Connected" ? connection :
!rendererReady ? "Connected; initializing graph renderer..." :
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;
}
function reportError(error) {
failure = "Viewer error: " + (error && error.message || error || "Graph rendering failed");
rendering = false;
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 = "";
updateUI();
socket.send(program.value);
}
function render(index) {
if (!rendererReady || rendering || index < 0 || index >= frames.length) return;
const frameGeneration = generation;
rendering = true;
updateUI();
const position = frames[index].match(/\/\/ POS:\s*(\d+)/);
if (position) program.setSelectionRange(Number(position[1]), Number(position[1]) + 1);
try {
renderer.renderDot(frames[index], () => {
rendering = false;
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);
try {
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("digraph")) {
frames.push(message);
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();
};
// The bundled renderer contains its own WASM engine; no worker script is needed.
const graph = document.getElementById("graph");
renderer = d3.select("#graph").graphviz({
useWorker: false, fit: true, width: graph.clientWidth, height: graph.clientHeight
})
.onerror(reportError)
.on("initEnd", () => {
rendererReady = true;
updateUI();
if (frames.length && current < 0) render(0);
})
.transition(() => d3.transition("main").ease(d3.easeLinear).duration(500));
window.addEventListener("resize", () => {
renderer.width(graph.clientWidth).height(graph.clientHeight);
if (current >= 0) render(current);
});
} catch (error) {
reportError(error);
}
updateUI();
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