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dom.js
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dom.js
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// JS语言拓展库 - DOM拓展
// Gen 1
import "./core.js";
const _to_node = v => v instanceof Node ? v : document.querySelector(v);
const _to_array = list => list instanceof Array ? list : [...list];
const _eql_node = (e, v) => v instanceof Node ? e === v : e.nodeValue === v;
const _try_create = (item, ctx) => item instanceof Elem ? item.create(ctx)[0] : item;
const _try_update = (item, elem, ctx, dupdate) => item instanceof Elem ? item._update(elem, ctx, dupdate) : item;
const _update_children = (elem, children) => {
if (elem instanceof Text) {
elem.nodeValue = children.ll.join('');
return;
}
if (elem.childNodes === children) return;
const rchildren = [...elem.childNodes];
children = _to_array(children);
const same_head = rchildren.every((e, i) => _eql_node(e, children[i]));
if (same_head) {
elem.append(...children.slice(rchildren.length));
} else {
elem.replaceChildren(...children);
}
};
export class Elem {
// name: String
// items: [Elem | String]
// did: String
// dclass: [String]
// dstyle: {String: String}
static var_indexed = Symbol("var_indexed");
constructor(name, ...items) {
this.name = name;
this.items = items;
this.events = [];
this.dattrs = [];
this.dclass = [];
this.handles_make = [];
this.handles_update = [];
}
attrs(...attrs_list) {
for (const attrs of attrs_list)
for (const k in attrs) this.dattrs.push([k, attrs[k]]);
return this;
}
var(dvar = Elem.var_indexed) {
return this.assign({dvar});
}
uid(duid) {
return this.assign({duid});
}
id(did) {
return this.assign({did});
}
on(event, handle = null) {
if (event instanceof Object)
this.events.push(...event.entries());
else
this.events.push([event, handle]);
return this;
}
on_make(...handle) {
this.handles_make.push(...handle);
return this;
}
on_update(...handle) {
this.handles_update.push(...handle);
return this;
}
class(...dclass) {
for (const klass of dclass) this.dclass.push(...klass.split(' '));
return this;
}
style(...styles) {
return this.assign({dstyle: (this.dstyle ?? {}).assign(...styles)});
}
ustatic(assert = true) {
return assert ? this.assign({dupdate: Elem.update_static}) : this;
}
ubind(assert = true) {
return assert ? this.assign({dupdate: Elem.update_bind}) : this;
}
uself(assert = true) {
return assert ? this.assign({dupdate: Elem.update_self}) : this;
}
uitems(assert = true) {
return assert ? this.assign({dupdate: Elem.update_items}) : this;
}
udynamic(assert = true) {
return assert ? this.assign({dupdate: Elem.update_dynamic}) : this;
}
uremake(assert = true) {
return assert ? this.assign({dupdate: Elem.update_remake}) : this;
}
uconst(assert = true) {
return assert ? this.assign({dupdate: Elem.update_const}) : this;
}
umut(mut_self = Elem.mut_self_const, mut_items = Elem.mut_items_by_pos) {
return this.assign({dupdate: Elem.update_mut(mut_self, mut_items)});
}
_make(e, ...children) {
if (this.did) e.id = this.did;
if (this.duid) e.uid = this.duid;
if (this.dstyle) {
e.style.assign(this.dstyle);
for (const [key, value] of this.dstyle.entries())
if (key.startsWith("--")) e.style.setProperty(key, value);
}
for (const [event, handle] of this.events) e.addEventListener(event, handle);
for (const [key, value] of this.dattrs) e.setAttribute(key, value);
if (this.dclass.length) e.classList.add(...this.dclass);
e.append(...children);
for (const handle of this.handles_make) handle(e, this);
return e;
}
make(...children) {
return this._make(document.createElement(this.name), ...children);
}
bind_var(elem, ctx) {
if (this.dvar) {
if (this.dvar === Elem.var_indexed)
ctx.push(elem);
else
ctx[this.dvar] = elem;
}
}
attach(parent, clear = false) {
const [e, ctx] = this.create();
if (clear)
_to_node(parent).replaceChildren(e);
else
_to_node(parent).append(e);
return [e, ctx];
}
create(ctx = []) {
return this._create(ctx);
}
_create(ctx) {
const children = this.items.map(item => _try_create(item, ctx));
const e = this.make(...children);
this.bind_var(e, ctx);
for (const handle of this.handles_update) handle(e, ctx, this);
return [e, ctx];
}
update(elem, dupdate = Elem.update_static, ctx = []) {
return [this._update(_to_node(elem), ctx, dupdate), ctx];
}
_update(elem, ctx, dupdate) {
this.bind_var(elem, ctx);
const rupdate = this.dupdate ?? dupdate;
const e = rupdate(this, elem, ctx, dupdate);
for (const handle of this.handles_update) handle(e, ctx, this);
return e;
}
static update_static = (self, elem, ctx, dupdate) => {
const children = [self.items, [...elem.childNodes]].group_map(([item, e]) =>
e ? _try_update(item, e, ctx, dupdate) : _try_create(item, ctx));
_update_children(elem, children);
return elem;
};
static update_bind = (self, elem, ctx, dupdate) => {
const children = [self.items, [...elem.childNodes]].group_map(([item, e]) =>
e ? _try_update(item, e, ctx, dupdate) : _try_create(item, ctx));
elem = self._make(elem, ...children);
return elem;
};
static update_self = (self, elem, ctx, dupdate) => {
elem = self.make(...elem.childNodes).let(e => elem.replaceWith(e));
return elem;
};
static update_items = (self, elem, ctx, dupdate) => {
_update_children(elem, self.items.map(item => _try_create(item, ctx)));
return elem;
};
static update_dynamic = (self, elem, ctx, dupdate) => {
const children = [self.items, [...elem.childNodes]].group_map(([item, e]) =>
e ? _try_update(item, e, ctx, dupdate) : _try_create(item, ctx));
elem = self.make(...children).let(e => elem.replaceWith(e));
return elem;
};
static update_remake = (self, elem, ctx) =>
self.create(ctx)[0].let(e => elem.replaceWith(e));
static update_const = (_, elem) => elem;
static update_mut = (mut_self, mut_items) => (self, elem, ctx, dupdate) => {
const children = mut_items(self, elem, ctx, dupdate);
const nelem = mut_self(self, elem, ctx, dupdate);
if (nelem !== elem) elem.replaceWith(nelem);
_update_children(nelem, children);
return elem;
};
static mut_self_const = (_, elem) => elem;
static mut_self_remake = self => self.make();
static mut_items_const = (_, elem) => elem.childNodes;
static mut_items_remake = (self, _, ctx) => self.items.map(item => _try_create(item, ctx));
static mut_items_by_pos = (self, elem, ctx, dupdate) =>
[self.items, [...elem.childNodes]].group_map(([item, e]) =>
e ? _try_update(item, e, ctx, dupdate) : _try_create(item, ctx));
static mut_items_by_uid_loose = (self, elem, ctx, dupdate) =>
[self.items, [...elem.childNodes]].group_map(([item, e]) =>
e && e.uid === item.duid ? _try_update(item, e, ctx, dupdate) : _try_create(item, ctx));
};
export const elem = ((name, ...items) => new Elem(name, ...items)).later;
export const div = ((...items) => elem("div", ...items)).later;
export const img = (src => elem("img").attrs({src})).later;
export const canvas = ((...items) => elem("canvas", ...items).on_make(e => e.context = e.getContext("2d"))).later;
globalThis.assign({Elem, elem, div, img, canvas});