html encoding

mrdebug

Hi, is there a function to translate a standard charset word to html? For example:

"perché" -> "perch&eacute;"

sierdzio

https://doc.qt.io/qt-5/qstring.html#toHtmlEscaped

sierdzio

Hm although that probably won't work for é character :/

sierdzio

Perhaps QUrl would work better here https://doc.qt.io/qt-5/qurl.html#toPercentEncoding

raven-worx

@mrdebug
you can traverse the string char-wise and replace each unicode character >= 128 with &#<num> or &#x<unicode-hex-val>
For the named entities (like é) you once will need to create a static replacement map.

JonB

@sierdzio

Perhaps QUrl would work better here https://doc.qt.io/qt-5/qurl.html#toPercentEncoding

I have been known in the past to "cheat" by using url encoding rules on HTML (e.g. in JavaScript) like @sierdzio suggests. But be aware the rules are not the same (HTML encoing != URL encoding), it's naughty and does not work in all cases.

Like @raven-worx says, if you want things like é you have to do this by hand every time, following voluminous lists like the reference he gives. Why languages/libraries do not seem to supply a useful function for this because it gets asked/wanted a lot, I do not know.

mrdebug

Many thanks for your support. I need only a function to translate the IoT device descriptions in a correct html format to send notification emails.
So this function is enough for me.

QString TextToHTML(QString Value) {
    Value.replace("à", "&agrave;");
    Value.replace("è", "&egrave;");
    Value.replace("é", "&eacute;");
    Value.replace("ì", "&igrave;");
    Value.replace("ò", "&ograve;");
    Value.replace("ù", "&agrave;");
    return Value;
}

This function is not so cool but could be enough.

JonB

@mrdebug
Yes this is what you have to do. However, while you are there, what are you doing about any characters which must be entitized for correct HTML, like < -> < ? I always do at least the 4: <, &, " & '. @sierdzio 's https://doc.qt.io/qt-5/qstring.html#toHtmlEscaped will do you for that. You might like to call that [at the start of, not the end!] in your TextToHTML() function.

raven-worx

@mrdebug said in html encoding:
instead of

Value.replace("à", "&agrave;");

better do

Value.replace( QChar(0x00C0)/*à*/,  QStringLiteral("&agrave;"));

it's more robust.

aha_1980

@JonB said in html encoding:

@mrdebug
Yes this is what you have to do. However, while you are there, what are you doing about any characters which must be entitized for correct HTML, like < -> < ? I always do at least the 4: <, &, " & '.

That is, as @sierdzio already pointed out, https://doc.qt.io/qt-5/qstring.html#toHtmlEscaped

JonB

@aha_1980 Yep, missed that, corrected my post.

Unsolved html encoding