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115 lines
5.6 KiB
115 lines
5.6 KiB
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<title>QHebrewCodec Class</title>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QHebrewCodec Class Reference</h1>
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<p>The QHebrewCodec class provides conversion to and from
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visually ordered Hebrew.
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<a href="#details">More...</a>
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<p>All the functions in this class are <a href="threads.html#reentrant">reentrant</a> when Qt is built with thread support.</p>
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<p><tt>#include <<a href="qrtlcodec-h.html">qrtlcodec.h</a>></tt>
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<p>Inherits <a href="qtextcodec.html">QTextCodec</a>.
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<p><a href="qhebrewcodec-members.html">List of all member functions.</a>
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<h2>Public Members</h2>
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<ul>
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<li class=fn>virtual const char * <a href="#mimeName"><b>mimeName</b></a> () const</li>
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<li class=fn>virtual QCString <a href="#fromUnicode"><b>fromUnicode</b></a> ( const QString & uc, int & lenInOut ) const</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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<p> The QHebrewCodec class provides conversion to and from
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visually ordered Hebrew.
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<p> Hebrew as a semitic language is written from right to left.
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Because older computer systems couldn't handle reordering a string
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so that the first letter appears on the right, many older
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documents were encoded in visual order, so that the first letter
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of a line is the rightmost one in the string.
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<p> In contrast to this, Unicode defines characters to be in logical
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order (the order you would read the string). This codec tries to
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convert visually ordered Hebrew (8859-8) to Unicode. This might
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not always work perfectly, because reversing the <em>bidi</em>
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(bi-directional) algorithm that transforms from logical to visual
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order is non-trivial.
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<p> Transformation from Unicode to visual Hebrew (8859-8) is done
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using the bidi algorithm in Qt, and will produce correct results,
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so long as the codec is given the text a whole paragraph at a
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time. Places where newlines are supposed to go can be indicated by
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a newline character ('\n'). Note that these newline characters
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change the reordering behaviour of the algorithm, since the bidi
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reordering only takes place within one line of text, whereas
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line breaks are determined in visual order.
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<p> Visually ordered Hebrew is still used quite often in some places,
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mainly in email communication (since most email programs still
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don't understand logically ordered Hebrew) and on web pages. The
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use on web pages is rapidly decreasing, due to the availability of
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browsers that correctly support logically ordered Hebrew.
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<p> This codec has the name "iso8859-8". If you don't want any bidi
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reordering to happen during conversion, use the "iso8859-8-i"
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codec, which assumes logical order for the 8-bit string.
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<p>See also <a href="i18n.html">Internationalization with Qt</a>.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a href="qcstring.html">QCString</a> <a name="fromUnicode"></a>QHebrewCodec::fromUnicode ( const <a href="qstring.html">QString</a> & uc, int & lenInOut ) const<tt> [virtual]</tt>
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</h3>
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Transforms the logically ordered <a href="qstring.html">QString</a>, <em>uc</em>, into a visually
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ordered string in the 8859-8 encoding. Qt's bidi algorithm is used
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to perform this task. Note that newline characters affect the
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reordering, since reordering is done on a line by line basis.
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<p> The algorithm is designed to work on whole paragraphs of text, so
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processing a line at a time may produce incorrect results. This
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approach is taken because the reordering of the contents of a
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particular line in a paragraph may depend on the previous line in
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the same paragraph.
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<p> Some encodings (for example Japanese or UTF-8) are multibyte (so
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one input character is mapped to two output characters). The <em>lenInOut</em> argument specifies the number of QChars that should be
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converted and is set to the number of characters returned.
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<p>Reimplemented from <a href="qtextcodec.html#fromUnicode">QTextCodec</a>.
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<h3 class=fn>const char * <a name="mimeName"></a>QHebrewCodec::mimeName () const<tt> [virtual]</tt>
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</h3>
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Returns the codec's mime name.
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<p>Reimplemented from <a href="qtextcodec.html#mimeName">QTextCodec</a>.
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