Difference between revisions of "UTF8 Tools"

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{{LanguageBar|UTF8 Tools}}
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__TOC__
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== About ==
 
== About ==
  
Sharing some of my code
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This code allows to process Unicode text and determine for unicode chars:
 +
 
 +
* if char "letter"
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* if char "digit"
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* if char upper-case, lower-case
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* if char "white space"
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* if char "punctuation"
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* etc.
  
----
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Also it has class to read/write Unicode from/to TStream.
  
= UTF-8 Tools =
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= Units =
== Purpose ==
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== Using streams ==
Some tools for common problems with UTF-8 / Unicode.
 
  
* charencstreams.pas: Load and save data from almost any text source like
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Unit "charencstreams": load/save data from/to almost any text source:
** ansi, UTF8, UTF16, UTF32
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** big or little endian
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* ANSI, UTF8, UTF16, UTF32
** BOM or no BOM
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* big-endian, little-endian
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* with/without BOM
 
      
 
      
Simple usage:
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Demo:
    fCES := TCharEncStream.Create;
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    fCES.LoadFromFile(OpenDialog1.FileName);
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<syntaxhighlight lang="pascal">
     Memo1.text := fCES.UTF8Text;   
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f := TCharEncStream.Create;
     fCES.free;
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f.LoadFromFile(OpenDialog1.FileName);
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Memo1.Text := f.UTF8Text; 
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f.Free;
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</syntaxhighlight>
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== Character info ==
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Unit "character": get information about code points using the TCharacter class. Demo:
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<syntaxhighlight lang="pascal">
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if TCharacter.IsLetter(s[i]) then
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     s[i] := TCharacter.toLower(s[i]);
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</syntaxhighlight>
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== Access UTF-8 by code index ==
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Unit "utf8scanner": access UTF-8 strings by code index, use case statements on UTF-8 strings and more. Demo:
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<syntaxhighlight lang="pascal">
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s := TUTF8Scanner.Create(Memo1.Text);
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for i := 1 to s.Length do
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  if TCharacter.IsLetter(s[i]) then
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    s[i] := TCharacter.toLower(s[i]);
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Memo1.Text := s.UTF8String;
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  s.Free;
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</syntaxhighlight>
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Case demo:
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<syntaxhighlight lang="pascal">
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  s := TUTF8Scanner.Create(Memo1.Text);
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  s.FindChars := 'öäü';
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  repeat
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     case s.FindIndex(s.Next) of
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  {ö} 0: s.Replace('oe');
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  {ä} 1: s.Replace('ae');
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  {ü} 2: s.Replace('ue');
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    end;
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  until s.Done;
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  Memo1.Text := s.UTF8String;
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  s.Free;
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</syntaxhighlight>
  
* character.pas: Get Information about code points using the TCharacter class.
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= Download =
  
* utf8scanner.pas: Access UTF-8 strings by code index, use case statements on UTF-8 strings and more...
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[http://www.theo.ch/lazarus/utf8tools.zip Download utf8tools.zip]
  
== Download ==
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[[Category:Unicode]]
[http://www.theo.ch/lazarus/utf8tools.zip Donwload utf8tools.zip]
 

Latest revision as of 17:48, 12 December 2018

English (en) русский (ru)

About

This code allows to process Unicode text and determine for unicode chars:

  • if char "letter"
  • if char "digit"
  • if char upper-case, lower-case
  • if char "white space"
  • if char "punctuation"
  • etc.

Also it has class to read/write Unicode from/to TStream.

Units

Using streams

Unit "charencstreams": load/save data from/to almost any text source:

  • ANSI, UTF8, UTF16, UTF32
  • big-endian, little-endian
  • with/without BOM

Demo:

 f := TCharEncStream.Create;
 f.LoadFromFile(OpenDialog1.FileName);
 Memo1.Text := f.UTF8Text;  
 f.Free;

Character info

Unit "character": get information about code points using the TCharacter class. Demo:

 if TCharacter.IsLetter(s[i]) then
    s[i] := TCharacter.toLower(s[i]);


Access UTF-8 by code index

Unit "utf8scanner": access UTF-8 strings by code index, use case statements on UTF-8 strings and more. Demo:

 s := TUTF8Scanner.Create(Memo1.Text);
 for i := 1 to s.Length do
   if TCharacter.IsLetter(s[i]) then
     s[i] := TCharacter.toLower(s[i]);
 Memo1.Text := s.UTF8String;
 s.Free;

Case demo:

  s := TUTF8Scanner.Create(Memo1.Text);
  s.FindChars := 'öäü';
  repeat
    case s.FindIndex(s.Next) of
  {ö} 0: s.Replace('oe');
  {ä} 1: s.Replace('ae');
  {ü} 2: s.Replace('ue');
    end;
  until s.Done;
  Memo1.Text := s.UTF8String;
  s.Free;

Download

Download utf8tools.zip