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@uni-helper/highlight

v0.0.1

Published

Lightweight code highlighting component for uni-app, powered by sugar-high

Readme

基于 sugar-high 的 uni-app 轻量级代码高亮组件。

支持小程序、H5 和 App(vue)。组件使用内联样式渲染纯 <view>/<text> 节点,不依赖 DOM、不使用 rich-text,也没有运行时渲染函数(小程序不支持)。

特性

  • ⚡️ 轻量:在 sugar-high 基础上 gzip 后约 1.5 kB
  • 🗂 内置 30+ 种语言支持:JavaScript/TypeScript、Vue、HTML、CSS、Python、Go、Rust、JSON、Diff、Markdown 等
  • 🏷 支持语言别名:ts、tsx、js、py、xml、.vue 等
  • 🌗 内置亮色和暗色主题,支持完全自定义主题
  • 🔢 可选行号、横向滚动或自动换行、文本可选
  • 📦 直接发布原始 SFC,由 uni-app 编译器按平台构建

安装

pnpm add @uni-helper/highlight

需要 uni-app Vue 3 项目(vue >= 3.3)。

使用

<script setup lang="ts">
import Code from '@uni-helper/highlight'
</script>

<template>
  <Code
    code="const ready = true"
    lang="ts"
  />
</template>

或者传入多行代码片段:

<script setup lang="ts">
import Code from '@uni-helper/highlight'

const snippet = `function greet(name: string) {
  return \`Hello, \${name}!\`
}`
</script>

<template>
  <Code
    :code="snippet"
    lang="ts"
    theme="dark"
    show-line-numbers
  />
</template>

Props

| 属性 | 类型 | 默认值 | 说明 | | ----------------- | ---------------------------------------------- | --------- | ---------------------------------------------------------------------------------------------------------------------- | | code | string | | 需要高亮的源代码 | | lang | string | | 语言名称、别名或扩展名(如 ts、.tsx、python)。未知语言回退到 JavaScript 词法分析器;使用 plaintext 可禁用高亮 | | theme | 'light' \| 'dark' \| Partial<HighlightTheme> | 'light' | 主题预设或自定义覆盖项 | | showLineNumbers | boolean | false | 渲染行号 | | selectable | boolean | false | 允许文本选择(微信小程序和 H5) | | tabSize | number | 2 | 制表符展开的空格数 | | wrap | boolean | false | 长行自动换行,而不是横向滚动 |

主题

内置了 sugar-high 官方的两套配色:

<Code :code="snippet" theme="dark" />

传入部分主题对象即可自定义任意颜色,未指定的颜色回退到亮色主题:

import { darkTheme } from '@uni-helper/highlight/theme'

const theme = {
  backgroundColor: '#1a1b26',
  colors: {
    keyword: '#bb9af7',
    string: '#9ece6a',
  },
}
<Code :code="snippet" :theme="theme" />

主题的结构如下:

interface HighlightTheme {
  backgroundColor: string
  foreground: string
  /** 每个 token 类型的文本颜色 */
  colors: Partial<Record<TokenType, string>>
  /** 行注释对应的行背景色,例如 `diff-add` */
  lineColors: Record<string, string>
}

底层 API

主题预设和高亮数据模型可以通过子路径导出使用:

import { darkTheme, lightTheme, resolveTheme } from '@uni-helper/highlight/theme'
import { tokenizeToLines } from '@uni-helper/highlight/tokenize'

const lines = tokenizeToLines('const a = 1', { lang: 'ts', theme: 'dark' })
// [{ index, value, tokens: [{ type, value, text, color, className }], className, blank, ... }]

text 字段对小程序是安全的:制表符已展开为空格,连续空格已转换为不换行空格,因为小程序 <text> 节点内连续的普通空格会被折叠。

AI Skills

本包内置了面向 AI 编程助手的 skill(skills/uni-app-highlight)。安装本包后运行一次:

npx skills-npm

即可把 skill 链接给你的 agent(skills-npm 已声明为本包的 peerDependency,npm 安装时会自动带上)。详见 skills-npm。

实现原理

  1. sugar-high 将代码解析为逐行 token(不涉及 DOM)。
  2. token 类型根据主题解析为对应颜色。
  3. 组件每行渲染一个 <view>,每个 token 渲染一个 <text>,颜色以内联样式呈现。使用内联样式是因为在小程序平台上,页面样式无法可靠地作用到组件内部。

包的入口就是原始的 .vue 单文件组件。这对小程序很关键:只有当导入直接解析到 .vue 文件时,uni-app 编译器才能静态注册组件,因此 import Code from '@uni-helper/highlight' 在所有平台开箱即用。渲染的节点上保留了 sugar-high 的语义类名(sh__line、sh__token--keyword 等),在平台支持的情况下,你可以在其上叠加自己的 CSS。

许可证

MIT License © FliPPeDround

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