@zaml/extract

zaml-extract

Entity extracting helper for ZAML.

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Install

npm install @zaml/extract

Usage

Plugin

A plugin is a function takes a text or Object expose methods for single text or text array

// extracting result structure
interface EntityInfo {
  start: number;
  end: number;
  text: string;
  type: string;
  data: {};
}

// function plugin
type SingleExtractor = (text: string) => Promise<EntityInfo[]>;

// instance plugin
interface ExtractorInterface {
  extract(text: string): Promise<EntityInfo[]>;
  extractArray(textList: string[]): Promise<EntityInfo[][]>;
}

Build-in plugin

Plugin	Type	Options	Description
link	function	none	Extracting domain names, emails
mention	function	{ users: string[], pattern: RegExp }	Extract user mention
rest	Class	{ url: string }	Extract entities from third party RESTful API

Extractor

type PluginOptions = string | {name: string, options: any} | SingleExtractor | ExtractorInterface;

interface {
  constructor(options: {plugins: ExtractorOptions[]}});
  extract(text: string | string[]): Promise<EntityInfo[] | EntityInfo[][]>
}

Extractor instance can be created by extract.create(),

It takes a option with plugins as an array of plugin options, each of options can be:

• A single string indicates build-in plugin name.
• A object with name of build-in plugin name and a options for plugin options.
• A simple function of type SingleExtractor.
• A object of type ExtractorInterface.

You can specify one plugin multi-times with different options, like rest plugin for different API.

Each plugin will take turns to execute the extraction process, in case there is some entity overlap, the former ones will be kept.

Example

import zaml from '@zaml/parser';
import extract from '@zaml/extract';

const extractor = extract.create({
  plugins: ['link'],
});
const node = zaml.tokenize('Hello @everyone! this is our web site: www.example.com');
node.extractEntities(extractor);

console.log(JSON.stringify(node, null, 2));

output:

example.json

API Documentation

Checkout API Documentation

Test

npm test

Test with more info of tokenizing

DEBUG=verbose npm test

License

MIT