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var websocket = undefined;
function generateRandomToken() {
const array = new Uint8Array(16);
window.crypto.getRandomValues(array);
return Array.from(array, dec => ('0' + dec.toString(16)).substr(-2)).join('');
}
function connect() {
websocket = (function() {
const host = window.location.host;
const params = new URLSearchParams(window.location.search);
let token = generateRandomToken();
if (params.has("token")) {
token = params.get("token");
}
const protocol = window.location.protocol === "https:" ? "wss:" : "ws:";
const ws = new WebSocket(protocol + "//" + host + "/repl/" + token);
ws.binaryType = "arraybuffer";
return ws;
})();
websocket.onopen = function(e) {
document.getElementById("command").classList.remove("disconnected");
document.getElementById("command").classList.add("connected");
document.getElementById("connect").src = "images/connected.png";
document.getElementById("connect").removeEventListener("click", connect);
};
websocket.onclose = function(e) {
document.getElementById("command").classList.remove("connected");
document.getElementById("command").classList.add("disconnected");
document.getElementById("connect").src = "images/connect.png";
document.getElementById("connect").addEventListener("click", connect);
};
websocket.onmessage = function(e) {
const reader = new FileReader();
reader.addEventListener('loadend', readMessageAndAppend(reader));
if(e.data instanceof ArrayBuffer) {
reader.readAsText(new Blob([e.data]));
} else {
reader.readAsText(e.data);
}
};
}
var commandHistory = [];
function appendOutput(text) {
const root = document.getElementById("minilang");
const sub = document.createElement("div");
sub.classList.add("output");
sub.appendChild(text);
if(root.firstChild) {
root.insertBefore(sub, root.firstChild);
} else {
root.appendChild(sub);
}
};
function prettyAST(term) {
if(term.tag === "Sym") {
return term.contents;
} else if(term.tag === "Abs") {
return "(lam (" + term.contents[0].join(" ") + ") " + prettyAST(term.contents[1]) + ")";
} else if(term.tag === "App") {
const pref = "(" + prettyAST(term.contents[0]) + " " + prettyAST(term.contents[1]);
if(term.contents[2]) {
return pref + " " + term.contents[2].map(prettyAST).join(" ") + ")";
} else {
return pref + ")";
}
}
return JSON.stringify(term);
}
function prettyType(type) {
if(type.tag === "TyVar") {
return type.contents;
} else if(type.tag === ":->") {
return "(" + prettyType(type.contents[0]) + " -> " + prettyType(type.contents[1]) + ")";
}
return JSON.stringify(type);
}
function formatResult(text) {
const result = JSON.parse(text);
if (result.tag === "Evaluated") {
return prettyAST(result.contents[0]) + ' : ' + prettyType(result.contents[2]);
} else if (result.tag === "Msg" ) {
return result.contents;
}
return text;
}
function readMessageAndAppend(reader) {
return () => {
appendOutput(document.createTextNode(formatResult(reader.result)));
};
};
function makeCommand(val) {
const words = val.split(/ +/);
if(words[0] === ":env") {
return {tag:"Com",contents:{tag:"DumpEnv"}};
} else if(words[0] === ":clear") {
return {tag:"Com",contents:{tag:"ClearEnv"}};
} else if(words[0] === ":help") {
return {tag:"Com",contents:{tag:"Help"}};
} else if(words[0] === ":lang") {
return {tag:"Com",contents:{tag:"Set", contents:{tag: "SelectLanguage", contents:words[1]}}};
} else {
return {tag:"In",contents:val};
}
};
function sendCommand(e) {
const input = document.getElementById("command");
if (e.keyCode == 13) {
const command = makeCommand(input.value);
appendOutput(document.createTextNode("> "+ input.value));
commandHistory.push(input.value);
websocket.send(JSON.stringify(command));
input.value = "";
return false;
} else if(e.keyCode == 38) {
input.value = commandHistory.pop() || "";
return false;
}
return true;
};
function loadText(e) {
const text = document.getElementById("program").value;
const command = {tag:"Com",
contents:{ tag:"Load",
contents:{ tag:"Data",
contents:text}}};
websocket.send(JSON.stringify(command));
return false;
};
function toggleHelp(e) {
const help = document.getElementById("help");
if(help.style.display === "block") {
help.style.display = "none";
} else {
help.style.display = "block";
}
}
document.getElementById("command").addEventListener("keyup", sendCommand);
document.getElementById("connect").addEventListener("click", connect);
document.getElementById("send").addEventListener("click", loadText);
document.getElementById("helptip").addEventListener("click", toggleHelp);
document.getElementById("help").addEventListener("click", toggleHelp);
connect();
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