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- ITERATE OVER STRING ANDROID CODEPOINTS HOW TO
- ITERATE OVER STRING ANDROID CODEPOINTS SKIN
- ITERATE OVER STRING ANDROID CODEPOINTS CODE
- ITERATE OVER STRING ANDROID CODEPOINTS WINDOWS
The problem is very clear and a modern application, mainly of chat, has to know how to deal with it.
![iterate over string android codepoints iterate over string android codepoints](https://i.stack.imgur.com/ACSBo.png)
When I give the substring (0, 8), the result will be: In a string manipulation it is very common, for example, to take x first characters, so suppose I want to take the first 8 chars:īut if S is " ??♂️ ??♂️", which incredibly has 14 chars, and which is the same as: to open the emoji windowĢ) Select for example the "White man raising his hand" which is represented by 7 characters, that is, 14 bytes)
ITERATE OVER STRING ANDROID CODEPOINTS WINDOWS
To clarify the problem, follow an example on TEdit:ġ) Select a TEdit, press Windows key +.
![iterate over string android codepoints iterate over string android codepoints](https://d33wubrfki0l68.cloudfront.net/c7c53e5e2f3e360b2a30358c7db1dbfdac2c7232/1c866/static/f44a5f1adcb52bf0bf3de850f33e911e/e8b86/python-while-for-loop.png)
It is the same as using AnsiString/AnsiChar when the input is string (unicode), you are at risk of generating an unexpected string. Today's problem is to fix TEdit, but it is not just that, but the safe way to manipulate any string received from the user. There are really few apps on Windows, except for chat apps, which fully support unicode (including MS apps), but in my case I really need to deal with this because it will be just a cross platform chat (Win, Android, iOS). Which is treated as 1 single Emoji of a Family with a dad, mom, and 2 children. Which is treated as 1 single Emoji of a light-skined woman sitting behind a PC.
ITERATE OVER STRING ANDROID CODEPOINTS SKIN
That emoji takes up 8 bytes, consisting of 4 UTF-16 codeunits:Īnd it gets even more complicated especially for Emoji, because 1) modern Emoji support skin tones and genders, which are handled using 1+ modifier codepoints, and 2) multiple unrelated Emoji can be grouped together with codepoint U+200D to create even new Emoji.
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SetString(FCurrent, FStart, FEnd - FStart) Ĭonstructor TTextElementEnumeratorHelper.Create(const AValue: string) įunction TTextElementEnumeratorHelper.GetEnumerator: TTextElementEnumerator īut the problem is that utf-16 is not limited to a maximum of 4 bytes for a graphic character, in fact it already predicts that a graphic character can have up to 14 bytes for future implementations, and today most of the emojis already occupy at least 8 bytes (like the emoji ?? <- light version). Property Current: string read GetCurrent įunction GetEnumerator: TTextElementEnumerator įunction TextElements(const AValue: string): TTextElementEnumeratorHelper Ĭonstructor TTextElementEnumerator.Create(const AValue: string) įunction TTextElementEnumerator.GetCurrent: string įunction TTextElementEnumerator.MoveNext: Boolean
ITERATE OVER STRING ANDROID CODEPOINTS CODE
You should then be able to write code such as:įor var Element in TextElements(MyString) do:Ĭonstructor Create(const AValue: string) See What('s) a character! | The Old New Thing () Note that in Windows CharNext is the best but still not perfect way to get text elements. Here is an implementation of a TextElementEnumerator (not tested) : So, how do you know the actual size of each graphic character in a string? This is a problem, because delphi only handles the graphic character with the possibility of being 2 bytes or 4 bytes, and is often converting the graphic character or string to UCS4Char or UCS4String respectively, to treat everyone as being 4 bytes. But the problem is that utf-16 is not limited to a maximum of 4 bytes for a graphic character, in fact it already predicts that a graphic character can have up to 14 bytes for future implementations, and today most of the emojis already occupy at least 8 bytes (like the emoji ?? <- light version). And in this case we need to check if the char IsSurrogate, to know that it is a graphic character of 2 Chars (4 bytes). The delphi string is an implementation of UTF-16 in which the "normal" graphic characters corresponding to 1 Char (2 bytes), but having others graphic characters being represented by 2 Chars (4 bytes), the so-called surrogate pair, (like the emoji ?).