1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
|
import { ElementNotFound, NotABrowser } from "./lustre.mjs";
import { Dispatch, Shutdown } from "./lustre/runtime.mjs";
import { morph } from "./vdom.ffi.mjs";
import { Ok, Error, isEqual } from "./gleam.mjs";
export class LustreClientApplication {
#root = null;
#queue = [];
#effects = [];
#didUpdate = false;
#model = null;
#update = null;
#view = null;
static start(flags, selector, init, update, view) {
if (!is_browser()) return new Error(new NotABrowser());
const root =
selector instanceof HTMLElement
? selector
: document.querySelector(selector);
if (!root) return new Error(new ElementNotFound(selector));
const app = new LustreClientApplication(init(flags), update, view, root);
return new Ok((msg) => app.send(msg));
}
constructor([model, effects], update, view, root = document.body) {
this.#model = model;
this.#update = update;
this.#view = view;
this.#root = root;
this.#effects = effects.all.toArray();
this.#didUpdate = true;
window.requestAnimationFrame(() => this.#tick());
}
send(action) {
switch (true) {
case action instanceof Dispatch: {
this.#queue.push(action[0]);
this.#tick();
return;
}
case action instanceof Shutdown: {
this.#shutdown();
return;
}
default:
return;
}
}
emit(event, data) {
this.#root.dispatchEvent(
new CustomEvent(event, {
bubbles: true,
detail: data,
composed: true,
})
);
}
#tick() {
this.#flush_queue();
if (this.#didUpdate) {
const vdom = this.#view(this.#model);
this.#didUpdate = false;
this.#root = morph(this.#root, vdom, (msg) => {
this.send(new Dispatch(msg));
});
}
}
#flush_queue(iterations = 0) {
while (this.#queue.length) {
const [next, effects] = this.#update(this.#model, this.#queue.shift());
this.#model = next;
this.#didUpdate ||= isEqual(this.#model, next);
this.#effects = this.#effects.concat(effects.all.toArray());
}
while (this.#effects.length) {
this.#effects.shift()(
(msg) => this.send(new Dispatch(msg)),
(event, data) => this.emit(event, data)
);
}
if (this.#queue.length) {
if (iterations < 5) {
this.#flush_queue(++iterations);
} else {
window.requestAnimationFrame(() => this.#tick());
}
}
}
#shutdown() {
this.#root.remove();
this.#root = null;
this.#model = null;
this.#queue = [];
this.#effects = [];
this.#didUpdate = false;
this.#update = () => {};
this.#view = () => {};
}
}
export const start = (app, selector, flags) =>
LustreClientApplication.start(
flags,
selector,
app.init,
app.update,
app.view
);
// UTILS -----------------------------------------------------------------------
export const is_browser = () => window && window.document;
export const is_registered = (name) =>
is_browser() && !!window.customElements.get(name);
export const prevent_default = (event) => event.preventDefault();
export const stop_propagation = (event) => event.stopPropagation();
|
