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wanco

v0.1.1

Published

wanco stands for WAsm text eNCOder.

Downloads

2

Readme

wanco

wanco stands for WAsm text eNCOder.

これなに / About

ブラウザ上で文字を別のエンコーディングに変換するやつ。

The one converting strings to other text encoding.

サポートしているエンコーディング / Supported Encoding

  • UTF-8
  • Shift_JIS
  • EUC-JP

コンセプト / Concept

CSV の作成など、Web ブラウザ上のみで巨大な UTF-8 形式の文字列を Shift_JIS に変換することを想定。

This assumed to converting huge UTF-8 format strings to Shift_JIS in the Web browser alone, e.g., for creating CSV files.

との比較は下記

Comparation bellow

| | encoding.js | Encoding API | wanco🐶 | | -------------- | :--------------------------: | :--------------------------: | :----------------------: | | Implementation | JavaScript | Native | WebAssembly | | Encode To | UTF-8, Shift_JIS, EUC-JP ... | UTF-8 | UTF-8, Shift_JIS, EUC-JP | | Decode From | UTF-8, Shift_JIS, EUC-JP ... | UTF-8, Shift_JIS, EUC-JP ... | ー |

インストール / Install

npm install --save wanco

使い方 / How to Use

import init, { encode } from "wanco";
init().then(() => {
  const encoded = encode(content, "shift_jis");
  // Encoded bytes.(number[])
  console.log(encoded.bytes);
  // Text encoding name.(string)
  console.log(encoded.encoding);
  // Whether having any unmappable characters.(bool)
  console.log(encoded.has_unmappable);
});

例 / Example

import init, { encode } from "wanco";
export const downloadAsCSV = (content: string): void => {
  init().then(() => {
    // Specify text encoding.
    const encoded = encode(content, "shift_jis");
    // "bytes" property has encoded codes.
    // Use new Uint8Array() to save through Blob.
    const data = new Uint8Array(encoded.bytes);
    const blob = new Blob([data], { type: "text/csv" });
    const anchor = document.createElement("a");
    const blobURL = URL.createObjectURL(blob);
    anchor.href = blobURL;
    anchor.click();
    URL.revokeObjectURL(blobURL);
  });
};

開発 / Development

wanco はwasm-packを利用して作成されています。

wanco is build using wasm-pack.

ローカルでの実行 / Run locally

wasm-pack build --target web
python3 -m http.server 8080

http://localhost:8080/へアクセスし、デモページであるindex.htmlを開く

Access http://localhost:8080/ to open index.html. (demo page file)

ビルド / Build

wasm-pack build --target web

パッケージ / Packaging

wasm-pack pack

テスト / Test

wasm-pack test --firefox --headless