HtmlEscapeMode class Null safety

HTML escape modes.

Allows specifying a mode for HTML escaping that depends on the context where the escaped result is going to be used. The relevant contexts are:

• as text content of an HTML element.
• as value of a (single- or double-) quoted attribute value.

All modes require escaping of & (ampersand) characters, and may enable escaping of more characters.

Custom escape modes can be created using the HtmlEscapeMode.HtmlEscapeMode constructor.

Example:

const htmlEscapeMode = HtmlEscapeMode(
  name: 'custom',
  escapeLtGt: true,
  escapeQuot: false,
  escapeApos: false,
  escapeSlash: false,
 );

const HtmlEscape htmlEscape = HtmlEscape(htmlEscapeMode);
String unescaped = 'Text & subject';
String escaped = htmlEscape.convert(unescaped);
print(escaped); // Text & subject

unescaped = '10 > 1 and 1 < 10';
escaped = htmlEscape.convert(unescaped);
print(escaped); // 10 &gt; 1 and 1 &lt; 10

unescaped = "Single-quoted: 'text'";
escaped = htmlEscape.convert(unescaped);
print(escaped); // Single-quoted: 'text'

unescaped = 'Double-quoted: "text"';
escaped = htmlEscape.convert(unescaped);
print(escaped); // Double-quoted: "text"

unescaped = 'Path: /system/';
escaped = htmlEscape.convert(unescaped);
print(escaped); // Path: /system/