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sdm2

v1.1.3

Published

A high performance library to match discontinuous strings

Downloads

10

Readme

npm minzipped size Coverage Status typescript license

🚀 特性

  • 易于使用
  • 高性能
  • 小于 1kb
  • 支持 TypeScript

安装

# via npm
npm install sdm2

# via yarn
yarn add sdm2

Node.js, esModule, Browser引入

// commonjs(Node.js)
var { match, filterMap } = require('sdm2').default;

// esModule
import { match, filterMap } from 'sdm2';

Browser

<script src="https://unpkg.com/sdm2"></script>

用法

也许你会用它在路径搜索,树型控件选项搜索,checkbox 项搜索,或其他一些本地数据的非连续字符串搜索,它都可以满足你,请参见下面的示例。

匹配字符串

const ret = match('src/views/home.jsx', 'shojsx');
/* ret => {
  origin: 'src/views/home.jsx',
  str: 'src/views/home.jsx',
  strArr: ['src/views/home.jsx'],
  position: [0, [10, 11], [15, 17]],
  indexes: [0, 10, 11, 15, 16, 17]
}
*/

// 未匹配则返回null
const ret = match('src/views/home.jsx', 'ZZZZ');
// ret => null

返回字段解释 | 字段名 | 描述 | | ---- | ---- | | origin | 被查找字符串,match 函数的第一个参数原始值 | | str | 匹配关键字后通过onMatched转换后的字符串,如果未指定onMatched,它的值和 origin 相同 | | strArr | 关键字已匹配字符串与未匹配字符串的切分数组,如果指定了onMatched,匹配部分为onMatched转换后的值 | | position | 匹配的关键字所在被查找字符串的位置,如果连续匹配到多个关键字,会通过[startIndex, endIndex]表示 | | indexes | 匹配的关键字所在被查找字符串的位置,与position不同的是,即使连续匹配到多个关键字也会一一列出 |

匹配嵌套的字符串

如果被查找的字符串嵌套在对象内,可以使用matchStr返回被查找的字符串。

const ret = match({ name: 'src/views/home.jsx' }, 'shojsx', {
	matchStr: obj => obj.name
});
/* ret => {
  origin: { name: 'src/views/home.jsx' },
  str: 'src/views/home.jsx',
  strArr: ['src/views/home.jsx'],
  position: [0, [10, 11], [15, 17]],
  indexes: [0, 10, 11, 15, 16, 17]
}
*/

数组过滤

利用未匹配值为 null 过滤数组。

const matchedStrings = [
  'src/views/home.jsx',
  'src/views/about.jsx',
  'src/views/ad.jsx',
];
const ret = matchedStrings.filter(strItem => match(strItem, 'srchom.X', { ignoreCase: true });
/* ret => ['src/views/home.jsx'] */

高亮已匹配字符

使用onMatched函数转换匹配字符串,可以高亮匹配到的关键字。

onMatched会在每次匹配到一部分关键字时触发,它的参数分别为匹配的关键字和查找的原始值。

import { match } from 'sdm2';
const ret = match('src/views/home.jsx', 'shojsx', {
	onMatched: (matchedStr, origin) => `<span class="highlight">${matchedStr}</span>`
});
/* ret => {
  origin: 'src/views/home.jsx',
  str: '<span class="highlight">s</span>rc/views/<span class="highlight">ho</span>me.<span class="highlight">jsx</span>',
  strArr: [
    '<span class="highlight">s</span>',
    'rc/views/',
    '<span class="highlight">ho</span>',
    'me.',
    '<span class="highlight">jsx</span>'
  ],
  position: [0, [10, 11], [15, 17]],
  indexes: [0, 10, 11, 15, 16, 17]
}
*/

过滤数组并高亮已匹配字符

如果对于字符串数组,我们可以使用filterMap同时进行过滤和转换字符串。filterMap将会先过滤出符合查找关键字的项,再调用onMap转换已匹配项

import { filterMap } from 'sdm2';

const matchedStrings = ['src/views/home.jsx', 'src/views/about.jsx', 'src/views/ad.jsx'];
const ret = filterMap(matchedStrings, 'shojsx', {
	onMatched: (matchedStr, originStr) => `<span class="highlight">${matchedStr}</span>`,
	onMap: (matchedInfo, index) => matchedInfo.str
});
/* ret => ['<span class="highlight">s</span>rc/views/<span class="highlight">ho</span>me.<span class="highlight">jsx</span>']
 */

jsx 语法高亮

可能你不喜欢使用dangerouslySetInnerHTML(react)或v-html(vue)来高亮关键字,在 jsx 中,你还可以在onMatched中返回虚拟 dom,并在onMap中返回已经切分好的数组,这更符合 UI 框架的使用习惯:

const ret = filterMap(matchedStrings, 'shojsx', {
	onMatched: (matchedStr, originStr) => <span class="highlight">${matchedStr}</span>,
	onMap: (matchedInfo, index) => matchedInfo.strArr
});

/* ret => [
  VNode {
    class: 'highlight',
    children: 's'
  },
  'rc/views/',
  VNode {
    class: 'highlight',
    children: 'ho'
  },
  'me.',
  VNode {
    class: 'highlight',
    children: 'jsx'
  }
]

性能


你不需担心性能问题,每一个被搜索字符串都只会被对比一次,因此保证了高性能。下面是随机字符串的性能测试结果。

关键字符串为 50 位随机字符串 | 字符串数量 | 单字符串长度 | 忽大小写 | 性能 | | ---- | ---- | ---- | ---- | | 1000 | 5000 | ✅ | 19ms | | 1000 | 5000 | ❌ | 16ms | | 5000 | 5000 | ✅ | 42ms | | 5000 | 5000 | ❌ | 39ms | | 10000 | 5000 | ✅ | 101ms | | 10000 | 5000 | ❌ | 84ms |

欢迎提交问题

如果您在使用 sdm2 时遇到困难,无论是 bug,还是新功能,都可以 点此提交

LICENSE

MIT