ch05_04.htm

编程珍珠,里面很多好用的代码,大家可以参考学习呵呵,

character is a member of more than one category.  Some properties are
normative; others are merely informative.  See the Unicode Standard
for the standard spiel on just how normative the normative information
is, and just how informative the informative information isn't.
<a name="INDEX-1555"></a><a name="INDEX-1556"></a><a name="INDEX-1557"></a>
</p>

<a name="perl3-tab-prop-basic"></a>
<h4 class="objtitle">Table 5.10. Standard Unicode Properties</h4>
<table border="1">

<tr>
<th>Property</th>
<th>Meaning</th>
<th>Normative</th>
</tr>




<tr>
<td><tt class="literal">IsCc</tt></td>
<td>Other, Control</td>
<td>Yes</td>
</tr>

<tr>
<td><tt class="literal">IsCf</tt></td>
<td>Other, Format</td>
<td>Yes</td>
</tr>

<tr>
<td><tt class="literal">IsCn</tt></td>
<td>Other, Not assigned</td>
<td>Yes</td>
</tr>

<tr>
<td><tt class="literal">IsCo</tt></td>
<td>Other, Private Use</td>
<td>Yes</td>
</tr>

<tr>
<td><tt class="literal">IsCs</tt></td>
<td>Other, Surrogate</td>
<td>Yes</td>
</tr>

<tr>
<td><tt class="literal">IsLl</tt></td>
<td>Letter, Lowercase</td>
<td>Yes</td>
</tr>

<tr>
<td><tt class="literal">IsLm</tt></td>
<td>Letter, Modifier</td>
<td>No</td>
</tr>

<tr>
<td><tt class="literal">IsLo</tt></td>
<td>Letter, Other</td>
<td>No</td>
</tr>

<tr>
<td><tt class="literal">IsLt</tt></td>
<td>Letter, Titlecase</td>
<td>Yes</td>
</tr>

<tr>
<td><tt class="literal">IsLu</tt></td>
<td>Letter, Uppercase</td>
<td>Yes</td>
</tr>

<tr>
<td><tt class="literal">IsMc</tt></td>
<td>Mark, Combining</td>
<td>Yes</td>
</tr>

<tr>
<td><tt class="literal">IsMe</tt></td>
<td>Mark, Enclosing</td>
<td>Yes</td>
</tr>

<tr>
<td><tt class="literal">IsMn</tt></td>
<td>Mark, Nonspacing</td>
<td>Yes</td>
</tr>

<tr>
<td><tt class="literal">IsNd</tt></td>
<td>Number, Decimal digit</td>
<td>Yes</td>
</tr>

<tr>
<td><tt class="literal">IsNl</tt></td>
<td>Number, Letter</td>
<td>Yes</td>
</tr>

<tr>
<td><tt class="literal">IsNo</tt></td>
<td>Number, Other</td>
<td>Yes</td>
</tr>

<tr>
<td><tt class="literal">IsPc</tt></td>
<td>Punctuation, Connector</td>
<td>No</td>
</tr>

<tr>
<td><tt class="literal">IsPd</tt></td>
<td>Punctuation, Dash</td>
<td>No</td>
</tr>

<tr>
<td><tt class="literal">IsPe</tt></td>
<td>Punctuation, Close</td>
<td>No</td>
</tr>

<tr>
<td><tt class="literal">IsPf</tt></td>
<td>Punctuation, Final quote</td>
<td>No</td>
</tr>

<tr>
<td><tt class="literal">IsPi</tt></td>
<td>Punctuation, Initial quote</td>
<td>No</td>
</tr>

<tr>
<td><tt class="literal">IsPo</tt></td>
<td>Punctuation, Other</td>
<td>No</td>
</tr>

<tr>
<td><tt class="literal">IsPs</tt></td>
<td>Punctuation, Open</td>
<td>No</td>
</tr>

<tr>
<td><tt class="literal">IsSc</tt></td>
<td>Symbol, Currency</td>
<td>No</td>
</tr>

<tr>
<td><tt class="literal">IsSk</tt></td>
<td>Symbol, Modifier</td>
<td>No</td>
</tr>

<tr>
<td><tt class="literal">IsSm</tt></td>
<td>Symbol, Math</td>
<td>No</td>
</tr>

<tr>
<td><tt class="literal">IsSo</tt></td>
<td>Symbol, Other</td>
<td>No</td>
</tr>

<tr>
<td><tt class="literal">IsZl</tt></td>
<td>Separator, Line</td>
<td>Yes</td>
</tr>

<tr>
<td><tt class="literal">IsZp</tt></td>
<td>Separator, Paragraph</td>
<td>Yes</td>
</tr>

<tr>
<td><tt class="literal">IsZs</tt></td>
<td>Separator, Space</td>
<td>Yes</td>
</tr>


</table>

<p>
<a name="INDEX-1558"></a><a name="INDEX-1559"></a><a name="INDEX-1560"></a><a name="INDEX-1561"></a><a name="INDEX-1562"></a>
Another useful set of properties has to do with whether a given character
can be decomposed (either canonically or compatibly) into other simpler
characters.  Canonical decomposition doesn't lose any formatting
information.  Compatibility decomposition may lose formatting
information such as whether a character is a superscript.</p>

<a name="perl3-tab-prop-comp"></a>
<table border="1">

<tr>
<th>Property</th>
<th>Information Lost</th>
</tr>




<tr>
<td><tt class="literal">IsDecoCanon</tt></td>
<td>Nothing</td>
</tr>

<tr>
<td><tt class="literal">IsDecoCompat</tt></td>
<td>
<p>Something (one of the following)</p>
</td>
</tr>

<tr>
<td><tt class="literal">IsDCcircle</tt></td>
<td>
<p>Circle around character</p>
</td>
</tr>

<tr>
<td><tt class="literal">IsDCfinal</tt></td>
<td>
<p>Final position preference (Arabic)</p>
</td>
</tr>

<tr>
<td><tt class="literal">IsDCfont</tt></td>
<td>
<p>Variant font preference</p>
</td>
</tr>

<tr>
<td><tt class="literal">IsDCfraction</tt></td>
<td>
<p>Vulgar fraction characteristic</p>
</td>
</tr>

<tr>
<td><tt class="literal">IsDCinitial</tt></td>
<td>
<p>Initial position preference (Arabic)</p>
</td>
</tr>

<tr>
<td><tt class="literal">IsDCisolated</tt></td>
<td>
<p>Isolated position preference (Arabic)</p>
</td>
</tr>

<tr>
<td><tt class="literal">IsDCmedial</tt></td>
<td>
<p>Medial position preference (Arabic)</p>
</td>
</tr>

<tr>
<td><tt class="literal">IsDCnarrow</tt></td>
<td>Narrow characteristic</td>
</tr>

<tr>
<td><tt class="literal">IsDCnoBreak</tt></td>
<td>Nonbreaking preference on space or hyphen</td>
</tr>

<tr>
<td><tt class="literal">IsDCsmall</tt></td>
<td>Small characteristic</td>
</tr>

<tr>
<td><tt class="literal">IsDCsquare</tt></td>
<td>
<p>Square around CJK character</p>
</td>
</tr>

<tr>
<td><tt class="literal">IsDCsub</tt></td>
<td>Subscription</td>
</tr>

<tr>
<td><tt class="literal">IsDCsuper</tt></td>
<td>Superscription</td>
</tr>

<tr>
<td><tt class="literal">IsDCvertical</tt></td>
<td>Rotation (horizontal to vertical)</td>
</tr>

<tr>
<td><tt class="literal">IsDCwide</tt></td>
<td>Wide characteristic</td>
</tr>

<tr>
<td><tt class="literal">IsDCcompat</tt></td>
<td>Identity (miscellaneous)</td>
</tr>


</table>
<p>
Here are some properties of interest to people doing bidirectional
rendering:
<a name="INDEX-1563"></a><a name="INDEX-1564"></a>
</p>

<a name="perl3-tab-prop-bidi"></a>
<table border="1">

<tr>
<th>Property</th>
<th>Meaning</th>
</tr>




<tr>
<td><tt class="literal">IsBidiL</tt></td>
<td>Left-to-right (Arabic, Hebrew)</td>
</tr>

<tr>
<td><tt class="literal">IsBidiLRE</tt></td>
<td>Left-to-right embedding</td>
</tr>

<tr>
<td><tt class="literal">IsBidiLRO</tt></td>
<td>Left-to-right override</td>
</tr>

<tr>
<td><tt class="literal">IsBidiR</tt></td>
<td>Right-to-left</td>
</tr>

<tr>
<td><tt class="literal">IsBidiAL</tt></td>
<td>Right-to-left Arabic</td>
</tr>

<tr>
<td><tt class="literal">IsBidiRLE</tt></td>
<td>Right-to-left embedding</td>
</tr>

<tr>
<td><tt class="literal">IsBidiRLO</tt></td>
<td>Right-to-left override</td>
</tr>

<tr>
<td><tt class="literal">IsBidiPDF</tt></td>
<td>Pop directional format</td>
</tr>

<tr>
<td><tt class="literal">IsBidiEN</tt></td>
<td>European number</td>
</tr>

<tr>
<td><tt class="literal">IsBidiES</tt></td>
<td>European number separator</td>
</tr>

<tr>
<td><tt class="literal">IsBidiET</tt></td>
<td>European number terminator</td>
</tr>

<tr>
<td><tt class="literal">IsBidiAN</tt></td>
<td>Arabic number</td>
</tr>

<tr>
<td><tt class="literal">IsBidiCS</tt></td>
<td>Common number separator</td>
</tr>

<tr>
<td><tt class="literal">IsBidiNSM</tt></td>
<td>Nonspacing mark</td>
</tr>

<tr>
<td><tt class="literal">IsBidiBN</tt></td>
<td>Boundary neutral</td>
</tr>

<tr>
<td><tt class="literal">IsBidiB</tt></td>
<td>Paragraph separator</td>
</tr>

<tr>
<td><tt class="literal">IsBidiS</tt></td>
<td>Segment separator</td>
</tr>

<tr>
<td><tt class="literal">IsBidiWS</tt></td>
<td>Whitespace</td>
</tr>

<tr>
<td><tt class="literal">IsBidiON</tt></td>
<td>Other Neutrals</td>
</tr>

<tr>
<td><tt class="literal">IsMirrored</tt></td>