├── index.html
├── package.json
├── LICENSE
├── README.md
├── .gitignore
├── index.js
└── yarn.lock
/index.html:
--------------------------------------------------------------------------------
1 |
2 |
3 |
4 |
5 |
6 | Document
7 |
8 |
9 |
21 |
22 |
23 |
--------------------------------------------------------------------------------
/package.json:
--------------------------------------------------------------------------------
1 | {
2 | "name": "dirty-check",
3 | "version": "0.0.0",
4 | "description": "reactivity system with dirty checking",
5 | "main": "index.js",
6 | "scripts": {
7 | "test": "echo \"Error: no test specified\" && exit 1",
8 | "start": "serve ."
9 | },
10 | "repository": {
11 | "type": "git",
12 | "url": "git+https://github.com/yisar/dirty-checking.git"
13 | },
14 | "keywords": [],
15 | "author": "",
16 | "license": "ISC",
17 | "bugs": {
18 | "url": "https://github.com/yisar/dirty-checking/issues"
19 | },
20 | "homepage": "https://github.com/yisar/dirty-checking#readme",
21 | "devDependencies": {
22 | "serve": "^11.3.2"
23 | }
24 | }
25 |
--------------------------------------------------------------------------------
/LICENSE:
--------------------------------------------------------------------------------
1 | MIT License
2 |
3 | Copyright (c) 2020 伊撒尔
4 |
5 | Permission is hereby granted, free of charge, to any person obtaining a copy
6 | of this software and associated documentation files (the "Software"), to deal
7 | in the Software without restriction, including without limitation the rights
8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9 | copies of the Software, and to permit persons to whom the Software is
10 | furnished to do so, subject to the following conditions:
11 |
12 | The above copyright notice and this permission notice shall be included in all
13 | copies or substantial portions of the Software.
14 |
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 | SOFTWARE.
22 |
--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
1 | # dirty-check
2 |
3 | Tiny reactivity system with dirty checking.
4 |
5 | ### Motivation
6 |
7 | [点我](https://zhuanlan.zhihu.com/p/278238753)
8 |
9 | 由于基于`对象劫持`的响应式方案存在 ref 的缺陷，不利于组合……我们企图找到一种替代方案
10 |
11 | 这个仓库提供了一种脏检查的思路，它没有 ref 的缺陷，没有 hooks 的限制，对组合更有利
12 |
13 | ### Usage
14 |
15 | ```js
16 | import { ref, computed, invalidate } from './index.js'
17 | const count = ref(0)
18 | const double = computed(() => count() * 2)
19 | count(1)
20 | count(2)
21 |
22 | invalidate() // 开始脏检查
23 | console.log(double()) // 4
24 | ```
25 |
26 | ### Implement
27 |
28 | 脏检查也是一种依赖收集，每调用一次 invalidate 则开启一轮的脏检查，此时 computed 会重新计算
29 |
30 | 和 angularjs 不同，这个仓库使用了`有向图`的数据结构，约定脏检查是单向的，性能显著提升
31 |
32 | - vs setState
33 |
34 | 脏检查和 setState 是类似的，只是 setState 必须利用闭包缓存组件实例，而脏检查的响应式不需要和组件强绑定
35 |
36 | ```js
37 | const double = computed(() => count() * 2)
38 |
39 | const stateLessComponent = () =>
40 | ```
41 |
42 | - vs Proxy
43 |
44 | 脏检查和对象劫持也是类似的，一般来讲，脏检查性能会稍差，API 也低级些，但是没有 ref 的限制
45 |
46 | ### Compiler
47 |
48 | 建议和编译手段结合使用，脏检查的思路非常适合走编译路线
49 |
50 | ```html
51 |
59 |
60 |
61 | ```
62 |
63 | 大约编译成这个样子：
64 |
65 | ```html
66 |
74 |
75 |
76 | ```
77 |
78 | 不需要改变语义，不需要任何语法糖，runtime 也非常轻量
79 |
80 | p.s.
81 |
82 | 俺不开倒车，不同的机制有不同的优势，在 vue composition API 和 hooks API 都出现了限制的前提下
83 |
84 | 脏检查恰好可以规避这些限制，可以说最适合组合的方案了
85 |
86 | ### License
87 |
88 | MIT @132
89 |
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/.gitignore:
--------------------------------------------------------------------------------
1 | # Logs
2 | logs
3 | *.log
4 | npm-debug.log*
5 | yarn-debug.log*
6 | yarn-error.log*
7 | lerna-debug.log*
8 |
9 | # Diagnostic reports (https://nodejs.org/api/report.html)
10 | report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
11 |
12 | # Runtime data
13 | pids
14 | *.pid
15 | *.seed
16 | *.pid.lock
17 |
18 | # Directory for instrumented libs generated by jscoverage/JSCover
19 | lib-cov
20 |
21 | # Coverage directory used by tools like istanbul
22 | coverage
23 | *.lcov
24 |
25 | # nyc test coverage
26 | .nyc_output
27 |
28 | # Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
29 | .grunt
30 |
31 | # Bower dependency directory (https://bower.io/)
32 | bower_components
33 |
34 | # node-waf configuration
35 | .lock-wscript
36 |
37 | # Compiled binary addons (https://nodejs.org/api/addons.html)
38 | build/Release
39 |
40 | # Dependency directories
41 | node_modules/
42 | jspm_packages/
43 |
44 | # TypeScript v1 declaration files
45 | typings/
46 |
47 | # TypeScript cache
48 | *.tsbuildinfo
49 |
50 | # Optional npm cache directory
51 | .npm
52 |
53 | # Optional eslint cache
54 | .eslintcache
55 |
56 | # Microbundle cache
57 | .rpt2_cache/
58 | .rts2_cache_cjs/
59 | .rts2_cache_es/
60 | .rts2_cache_umd/
61 |
62 | # Optional REPL history
63 | .node_repl_history
64 |
65 | # Output of 'npm pack'
66 | *.tgz
67 |
68 | # Yarn Integrity file
69 | .yarn-integrity
70 |
71 | # dotenv environment variables file
72 | .env
73 | .env.test
74 |
75 | # parcel-bundler cache (https://parceljs.org/)
76 | .cache
77 |
78 | # Next.js build output
79 | .next
80 |
81 | # Nuxt.js build / generate output
82 | .nuxt
83 | dist
84 |
85 | # Gatsby files
86 | .cache/
87 | # Comment in the public line in if your project uses Gatsby and *not* Next.js
88 | # https://nextjs.org/blog/next-9-1#public-directory-support
89 | # public
90 |
91 | # vuepress build output
92 | .vuepress/dist
93 |
94 | # Serverless directories
95 | .serverless/
96 |
97 | # FuseBox cache
98 | .fusebox/
99 |
100 | # DynamoDB Local files
101 | .dynamodb/
102 |
103 | # TernJS port file
104 | .tern-port
105 |
--------------------------------------------------------------------------------
/index.js:
--------------------------------------------------------------------------------
1 | let count = 1
2 | let activeDeps = null
3 |
4 | export function clock() {
5 | return count
6 | }
7 |
8 | export function advanceClock() {
9 | count++
10 | }
11 |
12 | export const ref = (v) => {
13 | let value = { t: clock(), v }
14 | return (n) => {
15 | return n ? set(value, n) : get(value)
16 | }
17 | }
18 |
19 | export function restore(deps) {
20 | activeDeps = deps
21 | }
22 |
23 | export function set(v, n) {
24 | v.t = clock()
25 | v.v = n
26 | return v.v
27 | }
28 |
29 | export function get(v) {
30 | if (activeDeps === null) {
31 | activeDeps = [clock(), v]
32 | } else {
33 | activeDeps.push(v)
34 | }
35 | return typeof v === 'function' ? v : v.v
36 | }
37 |
38 | export function dirtyCheck(deps) {
39 | if (deps == null) return true
40 | const t = deps[0]
41 | for (let i = 1; i < deps.length; i++) {
42 | const v = deps[i]
43 | if (typeof v === 'object') {
44 | if (v.t > t) {
45 | return true
46 | }
47 | } else if (v(true, t) === true) {
48 | return true
49 | }
50 | }
51 | return false
52 | }
53 |
54 | export function save() {
55 | const deps = activeDeps
56 | activeDeps = null
57 | return deps
58 | }
59 |
60 | export function computed(fn) {
61 | let lastdirtyCheck = 0
62 | let lastUpdate = 0
63 | let value = void 0
64 | let deps = null
65 | return (token, time) => {
66 | const now = clock()
67 | if (lastdirtyCheck < now) {
68 | lastdirtyCheck = now
69 | if (dirtyCheck(deps) === true) {
70 | const prevDeps = save()
71 | const nextValue = fn(value)
72 | deps = save()
73 | restore(prevDeps)
74 | if (value !== nextValue) {
75 | value = nextValue
76 | lastUpdate = now
77 | }
78 | }
79 | }
80 | return token ? lastUpdate > time : value
81 | }
82 | }
83 |
84 | export function selector(fn) {
85 | let lastdirtyCheck = 0
86 | let lastUpdate = 0
87 | let value = void 0
88 | return () => {
89 | const now = clock()
90 | if (lastdirtyCheck < now) {
91 | lastdirtyCheck = now
92 | const nextValue = fn(value)
93 | if (value !== nextValue) {
94 | value = nextValue
95 | lastUpdate = now
96 | }
97 | }
98 | return token ? lastUpdate > time : value
99 | }
100 | }
101 |
102 | const defer =
103 | typeof Promise === 'function'
104 | ? function (cb) {
105 | Promise.resolve().then(cb)
106 | }
107 | : setTimeout
108 |
109 | export function invalidate(render) {
110 | try {
111 | defer(render)
112 | } finally {
113 | advanceClock()
114 | }
115 | }
116 |
--------------------------------------------------------------------------------
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531 | integrity sha512-Ba5m9/Fa4Xt9eb2ELXt77JxVDV8w7qQrH0zS/TWSJdLyAwQjWoOzpzj5lwVftDz6n/EOu3tNACS84v509qwnJA==
532 | dependencies:
533 | string-width "^2.1.1"
534 |
535 | yallist@^2.1.2:
536 | version "2.1.2"
537 | resolved "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz#1c11f9218f076089a47dd512f93c6699a6a81d52"
538 | integrity sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=
539 |
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