Rust + Boa

在生产应用中，强烈建议使用性能更高的引擎（如 v8）的绑定

¥In a production application, it is strongly recommended to use a binding for a more performant engine like v8

Boa 是一个用 Rust 编写的 JavaScript 引擎。

¥Boa is a JavaScript engine written in Rust.

SheetJS 是一个用于从电子表格读取和写入数据的 JavaScript 库。

¥SheetJS is a JavaScript library for reading and writing data from spreadsheets.

"完整示例" 部分创建一个命令行工具，用于从电子表格读取数据并生成 CSV 行。

¥The "Complete Example" section creates a command-line tool for reading data from spreadsheets and generating CSV rows.

集成详情

¥Integration Details

初始化 Boa

¥Initialize Boa

一个 JS 上下文可以用一行构建：

¥A JS context can be constructed in one line:

use boa_engine::Context;

/* initialize */
let context = &mut Context::default();

以下辅助函数将字符串计算为 JS 代码：

¥The following helper function evaluates strings as JS code:

use std::string::String;
use boa_engine::{Context, Source, JsError};

/* simple wrapper to evaluate code snippets */
fn eval_code(c: &mut Context, code: &str) -> Result<String, JsError> {
  let src = Source::from_bytes(code);
  match c.eval(src) {
    Ok(res) => { return Ok(res.to_string(c).unwrap().to_std_string_escaped()); }
    Err(e) => { return Err(e); }
  };
}

加载 SheetJS 脚本

¥Load SheetJS Scripts

SheetJS 独立脚本可以在 Boa 上下文中解析和评估。

¥The SheetJS Standalone scripts can be parsed and evaluated in a Boa context.

Boa 提供了一个特殊的辅助程序来从路径读取源代码：

¥Boa provides a special helper to read source code from a path:

use std::path::Path;
use std::string::String;
use boa_engine::{js_string, Context, Source, JsError};

/* simple wrapper to evaluate an entire script file */
fn eval_file(c: &mut Context, path: &str) -> Result<String, JsError> {
  let src = Source::from_filepath(Path::new(path)).unwrap();
  match c.eval(src) {
    Ok(res) => { return Ok(res.to_string(c).unwrap().to_std_string_escaped()); }
    Err(e) => { return Err(e); }
  };
}

// ...
  /* load library */
  match eval_file(context, "./xlsx.full.min.js") {
    Ok(_res) => {}
    Err(e) => { return eprintln!("Uncaught {e}"); }
  }

要确认库已加载，可以检查 XLSX.version：

¥To confirm the library is loaded, XLSX.version can be inspected:

  /* get version string */
  match eval_code(context, "XLSX.version") {
    Ok(res) => { println!( "SheetJS library version {}", res); }
    Err(e) => { return eprintln!("Uncaught {e}"); }
  }

读取文件

¥Reading Files

Boa 原生支持 ArrayBuffer。此代码片段将文件中的数据读取到 Vec<u8> 中，并将数据作为 ArrayBuffer 存储在全局范围内：

¥Boa supports ArrayBuffer natively. This snippet reads data from a file into Vec<u8> and stores the data as an ArrayBuffer in global scope:

  /* read file */
  let data: Vec<u8> = fs::read("pres.xlsx").unwrap();
  let array: JsArrayBuffer = JsArrayBuffer::from_byte_block(data, context).unwrap();
  let attrs = Attribute::WRITABLE | Attribute::ENUMERABLE | Attribute::CONFIGURABLE;
  context.register_global_property(js_string!("buf"), array, attrs);

  /* parse with SheetJS */
  match eval_code(context, "void (globalThis.wb = XLSX.read(buf))") {
    Ok(_res) => { }
    Err(e) => { return eprintln!("Uncaught {e}"); }
  }

wb 将是 JS 环境中的一个变量，可以使用各种 SheetJS API 函数进行检查。

¥wb will be a variable in the JS environment that can be inspected using the various SheetJS API functions.

完整示例

¥Complete Example

测试部署

该演示在以下部署中进行了测试：

¥This demo was tested in the following deployments:

架构	Boa	日期
`darwin-x64`	`0.18.0`	2024-04-25
`darwin-arm`	`0.18.0`	2024-05-23
`win10-x64`	`0.18.0`	2024-04-25
`win11-arm`	`0.18.0`	2024-05-25
`linux-x64`	`0.18.0`	2024-03-21
`linux-arm`	`0.18.0`	2024-05-25

安装 Rust。

¥Install Rust.

Boa 0.18.0 需要 Rust 版本 1.67 或更高版本。

¥Boa 0.18.0 requires Rust version 1.67 or later.

Debian 12（Bullseye）附带 Rust 版本 1.63.0。

¥Debian 12 (Bullseye) ships with Rust version 1.63.0.

强烈建议从官方发行版安装 Rust。

¥It is strongly recommended to install Rust from the official distribution.

创建一个新项目：

¥Create a new project:

cargo new sheetjs-boa
cd sheetjs-boa
cargo run

添加 boa_engine 箱子：

¥Add the boa_engine crate:

cargo add boa_engine

下载 SheetJS 独立脚本和测试文件。将这两个文件保存在项目目录中：

¥Download the SheetJS Standalone script and test file. Save both files in the project directory:

curl -LO https://cdn.sheetjs.com/xlsx-0.20.3/package/dist/xlsx.full.min.js
curl -LO https://xlsx.nodejs.cn/pres.xlsx

下载 main.rs 并替换 src/main.rs：

¥Download main.rs and replace src/main.rs:

curl -L -o src/main.rs https://xlsx.nodejs.cn/boa/main.rs

在发布模式下构建并运行应用：

¥Build and run the app in release mode:

cargo run --release

稍等片刻后，内容将以 CSV 形式显示。

¥After a short wait, the contents will be displayed in CSV form.

默认调试版本未优化，可能会引发堆栈溢出错误。强烈建议尽可能使用 --release。

¥The default debug build is not optimized and can elicit stack overflow errors. It is strongly encouraged to use --release when possible.

集成详情​

初始化 Boa​

加载 SheetJS 脚本​

读取文件​

完整示例​

集成详情

初始化 Boa

加载 SheetJS 脚本

读取文件

完整示例