Documentation for the plural modifier.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@59885 91177308-0d34-0410-b5e6-96231b3b80d8
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<title>"clang" CFE Internals Manual</title>
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<link type="text/css" rel="stylesheet" href="../content.css" />
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<tr><td>Description:</td><td>...</td></tr>
<tr><td colspan="2"><b>"plural" format</b></td></tr>
-<tr><td>Example:</td><td><tt>".."</tt></td></tr>
+<tr><td>Example:</td><td><tt>"you have %1 %plural{1:mouse|:mice}1 connected to
+ your computer"</tt></td></tr>
<tr><td>Classes:</td><td>Integers</td></tr>
-<tr><td>Description:</td><td>...</td></tr>
+<tr><td>Description:</td><td><p>This is a formatter for complex plural forms.
+ It is designed to handle even the requirements of languages with very
+ complex plural forms, as many Baltic languages have. The argument consists
+ of a series of expression/form pairs, separated by ':', where the first form
+ whose expression evaluates to true is the result of the modifier.</p>
+ <p>An expression can be empty, in which case it is always true. See the
+ example at the top. Otherwise, it is a series of one or more numeric
+ conditions, separated by ','. If any condition matches, the expression
+ matches. Each numeric condition can take one of three forms.</p>
+ <ul>
+ <li>number: A simple decimal number matches if the argument is the same
+ as the number. Example: <tt>"{1:mouse|:mice}"</tt></li>
+ <li>range: A range in square brackets matches if the argument is within
+ the range. Then range is inclusive both ends. Example:
+ <tt>"{0:none|1:one|[2,5]:some|:many}"</tt></li>
+ <li>modulo: A modulo operator is followed by a number, and equals sign
+ and either a number or a range. The tests are the same as for plain
+ numbers and ranges, but the argument is taken modulo the number first.
+ Example: <tt>"{%100=0:even hundred|%100=[1,50]:lower half|:everything
+ else}"</tt></li>
+ </ul>
+ <p>The parser is very unforgiving. A syntax error, even whitespace, will
+ abort, as will a failure to match the argument against any
+ expression.</p></td></tr>
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