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# strtok3
A promise based streaming [*tokenizer*](#tokenizer-object) for [Node.js](http://nodejs.org) and browsers.
The `strtok3` module provides several methods for creating a [*tokenizer*](#tokenizer-object) from various input sources.
Designed for:
* Seamless support in streaming environments.
* Efficiently decode binary data, strings, and numbers.
* Reading [predefined](https://github.com/Borewit/token-types) or custom tokens.
* Offering [*tokenizers*](#tokenizer-object) for reading from [files](#method-strtok3fromfile), [streams](#fromstream-function) or [Uint8Arrays](#frombuffer-function).
### Features
`strtok3` can read from:
* Files, using a file path as input.
* Node.js [streams](https://nodejs.org/api/stream.html).
* [Buffer](https://nodejs.org/api/buffer.html) or [Uint8Array](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint8Array).
* HTTP chunked transfer provided by [@tokenizer/http](https://github.com/Borewit/tokenizer-http).
* [Amazon S3](https://aws.amazon.com/s3) chunks with [@tokenizer/s3](https://github.com/Borewit/tokenizer-s3).
## Installation
```sh
npm install strtok3
```
### Compatibility
Starting with version 7, the module has migrated from [CommonJS](https://en.wikipedia.org/wiki/CommonJS) to [pure ECMAScript Module (ESM)](https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c).
The distributed JavaScript codebase is compliant with the [ECMAScript 2020 (11th Edition)](https://en.wikipedia.org/wiki/ECMAScript_version_history#11th_Edition_%E2%80%93_ECMAScript_2020) standard.
Requires a modern browser, Node.js (V8) ≥ 18 engine or Bun (JavaScriptCore) ≥ 1.2.
For TypeScript CommonJs backward compatibility, you can use [load-esm](https://github.com/Borewit/load-esm).
> [!NOTE]
> This module requires a [Node.js ≥ 16](https://nodejs.org/en/about/previous-releases) engine.
> It can also be used in a browser environment when bundled with a module bundler.
## Support the Project
If you find this project useful and would like to support its development, consider sponsoring or contributing:
- [Become a sponsor to Borewit](https://github.com/sponsors/Borewit)
- Buy me a coffee:
<a href="https://www.buymeacoffee.com/borewit" target="_blank"><img src="https://cdn.buymeacoffee.com/buttons/default-orange.png" alt="Buy me A coffee" height="41" width="174"></a>
## API Documentation
### strtok3 methods
Use one of the methods to instantiate an [*abstract tokenizer*](#tokenizer-object):
- [fromBlob](#fromblob-function)
- [fromBuffer](#frombuffer-function)
- [fromFile](#fromfile-function)*
- [fromStream](#fromstream-function)*
- [fromWebStream](#fromwebstream-function)
> [!NOTE]
> `fromFile` and `fromStream` only available when importing this module with Node.js
All methods return a [`Tokenizer`](#tokenizer-object), either directly or via a promise.
#### `fromBlob()` function
Create a tokenizer from a [Blob](https://developer.mozilla.org/en-US/docs/Web/API/Blob).
```ts
function fromBlob(blob: Blob, options?: ITokenizerOptions): BlobTokenizer
```
| Parameter | Optional | Type | Description |
|-----------|-----------|---------------------------------------------------|----------------------------------------------------------------------------------------|
| blob | no | [Blob](https://developer.mozilla.org/en-US/docs/Web/API/Blob) | [Blob](https://developer.mozilla.org/en-US/docs/Web/API/Blob) or [File](https://developer.mozilla.org/en-US/docs/Web/API/File) to read from |
| options | yes | [ITokenizerOptions](#ITokenizerOptions) | Tokenizer options |
Returns a [*tokenizer*](#tokenizer-object).
```js
import { fromBlob } from 'strtok3';
import { openAsBlob } from 'node:fs';
import * as Token from 'token-types';
async function parse() {
const blob = await openAsBlob('somefile.bin');
const tokenizer = fromBlob(blob);
const myUint8Number = await tokenizer.readToken(Token.UINT8);
console.log(`My number: ${myUint8Number}`);
}
parse();
```
#### `fromBuffer()` function
Create a tokenizer from memory ([Uint8Array](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint8Array) or Node.js [Buffer](https://nodejs.org/api/buffer.html)).
```ts
function fromBuffer(uint8Array: Uint8Array, options?: ITokenizerOptions): BufferTokenizer
```
| Parameter | Optional | Type | Description |
|------------|----------|--------------------------------------------------|-----------------------------------|
| uint8Array | no | [Uint8Array](https://nodejs.org/api/buffer.html) | Buffer or Uint8Array to read from |
| options | yes | [ITokenizerOptions](#ITokenizerOptions) | Tokenizer options |
Returns a [*tokenizer*](#tokenizer-object).
```js
import { fromBuffer } from 'strtok3';
import * as Token from 'token-types';
const tokenizer = fromBuffer(buffer);
async function parse() {
const myUint8Number = await tokenizer.readToken(Token.UINT8);
console.log(`My number: ${myUint8Number}`);
}
parse();
```
#### `fromFile` function
Creates a [*tokenizer*](#tokenizer-object) from a local file.
```ts
function fromFile(sourceFilePath: string): Promise<FileTokenizer>
```
| Parameter | Type | Description |
|----------------|----------|----------------------------|
| sourceFilePath | `string` | Path to file to read from |
> [!NOTE]
> - Only available for Node.js engines
> - `fromFile` automatically embeds [file-information](#file-information)
A Promise resolving to a [*tokenizer*](#tokenizer-object) which can be used to parse a file.
```js
import { fromFile } from 'strtok3';
import * as Token from 'token-types';
async function parse() {
const tokenizer = await fromFile('somefile.bin');
try {
const myNumber = await tokenizer.readToken(Token.UINT8);
console.log(`My number: ${myNumber}`);
} finally {
tokenizer.close(); // Close the file
}
}
parse();
```
#### `fromWebStream()` function
Create a tokenizer from a [WHATWG ReadableStream](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream).
```ts
function fromWebStream(webStream: AnyWebByteStream, options?: ITokenizerOptions): ReadStreamTokenizer
```
| Parameter | Optional | Type | Description |
|----------------|----------|--------------------------------------------------------------------------|------------------------------------|
| webStream | no | [ReadableStream](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream) | WHATWG ReadableStream to read from |
| options | yes | [ITokenizerOptions](#ITokenizerOptions) | Tokenizer options |
Returns a [*tokenizer*](#tokenizer-object).
```js
import { fromWebStream } from 'strtok3';
import * as Token from 'token-types';
async function parse() {
const tokenizer = fromWebStream(readableStream);
try {
const myUint8Number = await tokenizer.readToken(Token.UINT8);
console.log(`My number: ${myUint8Number}`);
} finally {
await tokenizer.close();
}
}
parse();
```
### `Tokenizer` object
The *tokenizer* is an abstraction of a [stream](https://nodejs.org/api/stream.html), file or [Uint8Array](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint8Array), allowing _reading_ or _peeking_ from the stream.
It can also be translated in chunked reads, as done in [@tokenizer/http](https://github.com/Borewit/tokenizer-http);
#### Key Features:
- Supports seeking within the stream using `tokenizer.ignore()`.
- Offers `peek` methods to preview data without advancing the read pointer.
- Maintains the read position via tokenizer.position.
#### Tokenizer functions
_Read_ methods advance the stream pointer, while _peek_ methods do not.
There are two kind of functions:
1. *read* methods: used to read a *token* of [Buffer](https://nodejs.org/api/buffer.html) from the [*tokenizer*](#tokenizer-object). The position of the *tokenizer-stream* will advance with the size of the token.
2. *peek* methods: same as the read, but it will *not* advance the pointer. It allows to read (peek) ahead.
#### `readBuffer` function
Read data from the _tokenizer_ into provided "buffer" (`Uint8Array`).
`readBuffer(buffer, options?)`
```ts
readBuffer(buffer: Uint8Array, options?: IReadChunkOptions): Promise<number>;
```
| Parameter | Type | Description |
|------------|----------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| buffer | [Buffer](https://nodejs.org/api/buffer.html) &#124; Uint8Array | Target buffer to write the data read to |
| options | [IReadChunkOptions](#ireadchunkoptions) | An integer specifying the number of bytes to read |
Return promise with number of bytes read.
The number of bytes read may be less than requested if the `mayBeLess` flag is set.
#### `peekBuffer` function
Peek (read ahead), from [*tokenizer*](#tokenizer-object), into the buffer without advancing the stream pointer.
```ts
peekBuffer(uint8Array: Uint8Array, options?: IReadChunkOptions): Promise<number>;
```
| Parameter | Type | Description |
|------------|-----------------------------------------|-----------------------------------------------------|
| buffer | Buffer &#124; Uint8Array | Target buffer to write the data read (peeked) to. |
| options | [IReadChunkOptions](#ireadchunkoptions) | An integer specifying the number of bytes to read. | |
Return value `Promise<number>` Promise with number of bytes read. The number of bytes read may be less if the `mayBeLess` flag was set.
#### `readToken` function
Read a *token* from the tokenizer-stream.
```ts
readToken<Value>(token: IGetToken<Value>, position: number = this.position): Promise<Value>
```
| Parameter | Type | Description |
|------------|-------------------------|---------------------------------------------------------------------------------------------------------------------- |
| token | [IGetToken](#IGetToken) | Token to read from the tokenizer-stream. |
| position? | number | Offset where to begin reading within the file. If position is null, data will be read from the current file position. |
Return value `Promise<number>`. Promise with number of bytes read. The number of bytes read maybe if less, `mayBeLess` flag was set.
#### `peek` function
Peek a *token* from the [*tokenizer*](#tokenizer-object).
```ts
peekToken<Value>(token: IGetToken<Value>, position: number = this.position): Promise<Value>
```
| Parameter | Type | Description |
|------------|----------------------------|-------------------------------------------------------------------------------------------------------------------------|
| token | [IGetToken<T>](#IGetToken) | Token to read from the tokenizer-stream. |
| position? | number | Offset where to begin reading within the file. If position is null, data will be read from the current file position. |
Return a promise with the token value peeked from the [*tokenizer*](#tokenizer-object).
#### `readNumber` function
Read a numeric [*token*](#token) from the [*tokenizer*](#tokenizer-object).
```ts
readNumber(token: IToken<number>): Promise<number>
```
| Parameter | Type | Description |
|------------|---------------------------------|----------------------------------------------------|
| token | [IGetToken<number>](#IGetToken) | Numeric token to read from the tokenizer-stream. |
A promise resolving to a numeric value read and decoded from the *tokenizer-stream*.
#### `ignore` function
Advance the offset pointer with the token number of bytes provided.
```ts
ignore(length: number): Promise<number>
```
| Parameter | Type | Description |
|------------|--------|------------------------------------------------------------------|
| length | number | Number of bytes to ignore. Will advance the `tokenizer.position` |
A promise resolving to the number of bytes ignored from the *tokenizer-stream*.
#### `close` function
Clean up resources, such as closing a file pointer if applicable.
#### `Tokenizer` attributes
- `fileInfo`
Optional attribute describing the file information, see [IFileInfo](#IFileInfo)
- `position`
Pointer to the current position in the [*tokenizer*](#tokenizer-object) stream.
If a *position* is provided to a _read_ or _peek_ method, is should be, at least, equal or greater than this value.
### `IReadChunkOptions` interface
Each attribute is optional:
| Attribute | Type | Description |
|-----------|---------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| length | number | Requested number of bytes to read. |
| position | number | Position where to peek from the file. If position is null, data will be read from the [current file position](#attribute-tokenizerposition). Position may not be less then [tokenizer.position](#attribute-tokenizerposition) |
| mayBeLess | boolean | If and only if set, will not throw an EOF error if less than the requested `mayBeLess` could be read. |
Example usage:
```js
tokenizer.peekBuffer(buffer, {mayBeLess: true});
```
### `IFileInfo` interface
Provides optional metadata about the file being tokenized.
| Attribute | Type | Description |
|-----------|---------|---------------------------------------------------------------------------------------------------|
| size | number | File size in bytes |
| mimeType | string | [MIME-type](https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types) of file. |
| path | string | File path |
| url | string | File URL |
### `Token` object
The *token* is basically a description of what to read from the [*tokenizer-stream*](#tokenizer-object).
A basic set of *token types* can be found here: [*token-types*](https://github.com/Borewit/token-types).
A token is something which implements the following interface:
```ts
export interface IGetToken<T> {
/**
* Length in bytes of encoded value
*/
len: number;
/**
* Decode value from buffer at offset
* @param buf Buffer to read the decoded value from
* @param off Decode offset
*/
get(buf: Uint8Array, off: number): T;
}
```
The *tokenizer* reads `token.len` bytes from the *tokenizer-stream* into a Buffer.
The `token.get` will be called with the Buffer. `token.get` is responsible for conversion from the buffer to the desired output type.
### Working with Web-API readable stream
To convert a [Web-API readable stream](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStreamDefaultReader) into a [Node.js readable stream]((https://nodejs.org/api/stream.html#stream_readable_streams)), you can use [readable-web-to-node-stream](https://github.com/Borewit/readable-web-to-node-stream) to convert one in another.
```js
import { fromWebStream } from 'strtok3';
import { ReadableWebToNodeStream } from 'readable-web-to-node-stream';
(async () => {
const response = await fetch(url);
const readableWebStream = response.body; // Web-API readable stream
const webStream = new ReadableWebToNodeStream(readableWebStream); // convert to Node.js readable stream
const tokenizer = fromWebStream(webStream); // And we now have tokenizer in a web environment
})();
```
## Dependencies
Dependencies:
- [@tokenizer/token](https://github.com/Borewit/tokenizer-token): Provides token definitions and utilities used by `strtok3` for interpreting binary data.
## Licence
This project is licensed under the [MIT License](LICENSE.txt). Feel free to use, modify, and distribute as needed.