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It seems that Dart does not provide a default mechanism (or at least I could not find it) to decode HTML escaped entities.
What I'd like to do is convert eg. Q&A to Q&A. (This is just an example)
As of version 1.11.1, Dart converts encodes these like so.
From there it is rather simple to create a custom converter implementation but that would not cover all the use-cases. Such as: what if < is expressed with the hex value of <?
Anyone got some pretty solution?
896
A Dart library for unescaping HTML-encoded strings. The idea is that while you seldom need encoding to such a level (most of the time, all you need to escape is <, >, /, & and " ), you do want to make sure that you cover the whole spectrum when decoding from HTML-escaped strings.
To encode or decode Base64 in Dart, you can make use of the dart:convert library: If you want to base64-encode a string, you need to convert it to Uint8List by using utf8.encode (), like this: That’s it. Further reading: You can also check out our Flutter category page or Dart category page for the latest tutorials and examples.
HTML Decode. HTML character decoding is the opposite process of encoding. The encoded characters are converted back to their original form in the decoding process. It decodes a string that contains HTML numeric character references and returns the decoded string. You can also choose to convert HTML code into JavaScript string.
To use Dart's convert package, import the library first by adding the following: To perform encoding, use: You only need to pass the string to be encoded. To decode the bytes into a String, use: If allowMalformed is set to true, it will replace invalid or unterminated octet sequences with the Unicode Replacement character `U+FFFD` (�).
I just made a small but complete Dart library for that exact purpose: html_unescape.
It supports:
)
á)ã)import 'package:html_unescape/html_unescape.dart';
main() {
var unescape = new HtmlUnescape();
var text = unescape.convert("<strong>This "escaped" string");
print(text);
}
You can also use the converter to transform a stream. For example, the code
below will transform a POSIX stdin into an HTML-unencoded stdout.
await stdin
.transform(new Utf8Decoder())
.transform(new HtmlUnescape())
.transform(new Utf8Encoder())
.pipe(stdout);
More info + docs on pub.
97
I think Dart/Flutter can do it for you by itself:
import 'dart:html' as html;
// In production use library — universal_html: ^1.1.18
// and — import 'package:universal_html/html.dart' as html;
void main() {
String badString =
'This " string " will be<strong> printed normally. < ' > </strong> >';
print(_parseHtmlString(badString));
}
String _parseHtmlString(String htmlString) {
var text = html.Element.span()..appendHtml(htmlString);
return text.innerText;
}
// It prints: This " string " will be printed normally. < ' > >
20
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