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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
module.metadata = {
"stability": "experimental",
"engines": {
"Firefox": "> 28"
}
};
const { Class } = require("../../core/heritage");
const { EventTarget } = require("../../event/target");
const { emit, off, setListeners } = require("../../event/core");
const { Reactor, foldp, send, merges } = require("../../event/utils");
const { Disposable } = require("../../core/disposable");
const { OutputPort } = require("../../output/system");
const { InputPort } = require("../../input/system");
const { identify } = require("../id");
const { pairs, object, map, each } = require("../../util/sequence");
const { patch, diff } = require("diffpatcher/index");
const { isLocalURL } = require("../../url");
const { compose } = require("../../lang/functional");
const { contract } = require("../../util/contract");
const { id: addonID, data: { url: resolve }} = require("../../self");
const { Frames } = require("../../input/frame");
const output = new OutputPort({ id: "frame-change" });
const mailbox = new OutputPort({ id: "frame-mailbox" });
const input = Frames;
const makeID = url =>
("frame-" + addonID + "-" + url).
split("/").join("-").
split(".").join("-").
replace(/[^A-Za-z0-9_\-]/g, "");
const validate = contract({
name: {
is: ["string", "undefined"],
ok: x => /^[a-z][a-z0-9-_]+$/i.test(x),
msg: "The `option.name` must be a valid alphanumeric string (hyphens and " +
"underscores are allowed) starting with letter."
},
url: {
map: x => x.toString(),
is: ["string"],
ok: x => isLocalURL(x),
msg: "The `options.url` must be a valid local URI."
}
});
const Source = function({id, ownerID}) {
this.id = id;
this.ownerID = ownerID;
};
Source.postMessage = ({id, ownerID}, data, origin) => {
send(mailbox, object([id, {
inbox: {
target: {id: id, ownerID: ownerID},
timeStamp: Date.now(),
data: data,
origin: origin
}
}]));
};
Source.prototype.postMessage = function(data, origin) {
Source.postMessage(this, data, origin);
};
const Message = function({type, data, source, origin, timeStamp}) {
this.type = type;
this.data = data;
this.origin = origin;
this.timeStamp = timeStamp;
this.source = new Source(source);
};
const frames = new Map();
const sources = new Map();
const Frame = Class({
extends: EventTarget,
implements: [Disposable, Source],
initialize: function(params={}) {
const options = validate(params);
const id = makeID(options.name || options.url);
if (frames.has(id))
throw Error("Frame with this id already exists: " + id);
const initial = { id: id, url: resolve(options.url) };
this.id = id;
setListeners(this, params);
frames.set(this.id, this);
send(output, object([id, initial]));
},
get url() {
const state = reactor.value[this.id];
return state && state.url;
},
destroy: function() {
send(output, object([this.id, null]));
frames.delete(this.id);
off(this);
},
// `JSON.stringify` serializes objects based of the return
// value of this method. For convinienc we provide this method
// to serialize actual state data.
toJSON: function() {
return { id: this.id, url: this.url };
}
});
identify.define(Frame, frame => frame.id);
exports.Frame = Frame;
const reactor = new Reactor({
onStep: (present, past) => {
const delta = diff(past, present);
each(([id, update]) => {
const frame = frames.get(id);
if (update) {
if (!past[id])
emit(frame, "register");
if (update.outbox)
emit(frame, "message", new Message(present[id].outbox));
each(([ownerID, state]) => {
const readyState = state ? state.readyState : "detach";
const type = readyState === "loading" ? "attach" :
readyState === "interactive" ? "ready" :
readyState === "complete" ? "load" :
readyState;
// TODO: Cache `Source` instances somewhere to preserve
// identity.
emit(frame, type, {type: type,
source: new Source({id: id, ownerID: ownerID})});
}, pairs(update.owners));
}
}, pairs(delta));
}
});
reactor.run(input);
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