parse-entities

What is parse-entities?

The parse-entities npm package is used to parse HTML entities in text. It can decode named and numerical character references in HTML, making it useful for processing and sanitizing HTML content.

What are parse-entities's main functionalities?

Decode named character references

This feature allows you to decode named character references in a string. For example, it converts " to ".

const parseEntities = require('parse-entities');
const decoded = parseEntities('The "quick" brown fox');
console.log(decoded); // Output: The "quick" brown fox

Decode numerical character references

This feature allows you to decode numerical character references in a string. For example, it converts 😀 to 😀.

const parseEntities = require('parse-entities');
const decoded = parseEntities('The 😀 emoji');
console.log(decoded); // Output: The 😀 emoji

Decode mixed character references

This feature allows you to decode a mix of named and numerical character references in a string.

const parseEntities = require('parse-entities');
const decoded = parseEntities('The "quick" brown fox jumps over the lazy dog🐶');
console.log(decoded); // Output: The "quick" brown fox jumps over the lazy dog🐶

Other packages similar to parse-entities

he

The 'he' package (short for HTML entities) is a robust HTML entity encoder/decoder. It supports both named and numerical character references and offers more configuration options compared to parse-entities.

entities

The 'entities' package is another library for encoding and decoding XML and HTML entities. It provides similar functionality to parse-entities but also includes support for encoding entities, which parse-entities does not offer.

html-entities

The 'html-entities' package provides methods to encode and decode HTML entities. It supports both named and numerical references and offers additional features like encoding non-ASCII characters.

README

parse-entities

Parse HTML character references: fast, spec-compliant, positional information.

Installation

npm:

npm install parse-entities

Usage

var decode = require('parse-entities')

decode('alpha &amp bravo')
// => alpha & bravo

decode('charlie &copycat; delta')
// => charlie ©cat; delta

decode('echo © foxtrot ≠ golf 𝌆 hotel')
// => echo © foxtrot ≠ golf 𝌆 hotel

API

parseEntities(value[, options])

options

options.additional

Additional character to accept (string?, default: ''). This allows other characters, without error, when following an ampersand.

options.attribute

Whether to parse value as an attribute value (boolean?, default: false).

options.nonTerminated

Whether to allow non-terminated entities (boolean, default: true). For example, &copycat for ©cat. This behaviour is spec-compliant but can lead to unexpected results.

options.warning

Error handler (Function?).

options.text

Text handler (Function?).

options.reference

Reference handler (Function?).

options.warningContext

Context used when invoking warning ('*', optional).

options.textContext

Context used when invoking text ('*', optional).

options.referenceContext

Context used when invoking reference ('*', optional)

options.position

Starting position of value (Location or Position, optional). Useful when dealing with values nested in some sort of syntax tree. The default is:

{
  start: {line: 1, column: 1, offset: 0},
  indent: []
}

Returns

string — Decoded value.

function warning(reason, position, code)

Error handler.

Context

this refers to warningContext when given to parseEntities.

Parameters

reason

Human-readable reason for triggering a parse error (string).

position

Place at which the parse error occurred (Position).

code

Identifier of reason for triggering a parse error (number).

The following codes are used:

Code	Example	Note
1	foo &amp bar	Missing semicolon (named)
2	foo &#123 bar	Missing semicolon (numeric)
3	Foo &bar baz	Ampersand did not start a reference
4	Foo &#	Empty reference
5	Foo &bar; baz	Unknown entity
6	Foo € baz	Disallowed reference
7	Foo � baz	Prohibited: outside permissible unicode range

function text(value, location)

Text handler.

Context

this refers to textContext when given to parseEntities.

Parameters

value

String of content (string).

location

Location at which value starts and ends (Location).

function reference(value, location, source)

Character reference handler.

Context

this refers to referenceContext when given to parseEntities.

Parameters

value

Encoded character reference (string).

location

Location at which value starts and ends (Location).

source

Source of character reference (Location).

Related

• stringify-entities — Encode HTML character references
• character-entities — Info on character entities
• character-entities-html4 — Info on HTML4 character entities
• character-entities-legacy — Info on legacy character entities
• character-reference-invalid — Info on invalid numeric character references

License

MIT © Titus Wormer