https://github.com/extism/assemblyscript-pdk

Extism Plug-in Development Kit (PDK) for AssemblyScript
https://github.com/extism/assemblyscript-pdk

Last synced: about 2 months ago
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Extism Plug-in Development Kit (PDK) for AssemblyScript

• Host: GitHub
• URL: https://github.com/extism/assemblyscript-pdk
• Owner: extism
• License: bsd-3-clause
• Created: 2022-08-30T00:44:15.000Z (about 2 years ago)
• Default Branch: main
• Last Pushed: 2024-02-29T21:17:52.000Z (7 months ago)
• Last Synced: 2024-07-06T20:23:17.276Z (2 months ago)
• Language: TypeScript
• Size: 37.1 KB
• Stars: 7
• Watchers: 3
• Forks: 3
• Open Issues: 2
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

Awesome Lists containing this project

• awesome-wasm-runtimes - `AssemblyScript`

README

        
# Extism AssemblyScript PDK

### Installation

```sh

npm install @extism/[email protected] --save

```

### Compiling to WebAssembly

Use the AssemblyScript compiler, `asc`:

```sh

npx asc example.ts --outFile example.wasm --use abort=example/myAbort

```

### Example Usage

```typescript title=example.ts

import { Host, Var, Config } from '@extism/as-pdk';

function myAbort(

  message: string | null,

  fileName: string | null,

  lineNumber: u32,

  columnNumber: u32

): void { }

export function count_vowels(): i32 {

  let str = Host.inputString();

  var count = 0;

  for (var i = 0; i < str.length; i++) {

    let x: string = str[i];

    if (x == 'a' || x == 'A' ||

      x == 'e' || x == 'E' ||

      x == 'i' || x == 'I' ||

      x == 'o' || x == 'O' ||

      x == 'u' || x == 'U') {

      count += 1;

    }

  }

  // Additional plug-in APIs:

  // persistent variables (scoped to individual plugin)

  var a = Uint8Array.wrap(String.UTF8.encode("this is var a"))

  Var.set('a', a);

  let data = Var.get('a');

  let var_a = (data == null) ? "null" : String.UTF8.decode(data.buffer);

  // config, provided by the host

  const thing = Config.get("thing");

  // write data back to host for use in program

  var out = '{"count": ' + count.toString() + ', "config": "' + (thing == null ? "null" : thing) + '", "a": "' + var_a + '"}';

  Host.outputString(out);

  Var.remove('a');

  return 0;

}

```