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76 lines
2.5 KiB
PHP
76 lines
2.5 KiB
PHP
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<?php
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/**
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* YiiBase class file.
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @link http://www.yiiframework.com/
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* @copyright 2008-2013 Yii Software LLC
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* @license http://www.yiiframework.com/license/
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*/
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/**
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* CChoiceFormat is a helper that chooses an appropriate message based on the specified number value.
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* The candidate messages are given as a string in the following format:
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* <pre>
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* 'expr1#message1|expr2#message2|expr3#message3'
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* </pre>
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* where each expression should be a valid PHP expression with <code>'n'</code> as the only variable.
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* For example, <code>'n==1'</code> and <code>'n%10==2 && n>10'</code> are both valid expressions.
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* The variable <code>'n'</code> will take the given number value, and if an expression evaluates true,
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* the corresponding message will be returned.
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*
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* For example, given the candidate messages <code>'n==1#one|n==2#two|n>2#others'</code> and
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* the number value 2, the resulting message will be <code>'two'</code>.
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*
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* For expressions like <code>'n==1'</code>, we can also use a shortcut <code>'1'</code>. So the above example
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* candidate messages can be simplified as <code>'1#one|2#two|n>2#others'</code>.
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*
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* In case the given number doesn't select any message, the last candidate message
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* will be returned.
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*
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* The PHP expressions will be evaluated using {@link evaluate}.
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @package system.i18n
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*/
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class CChoiceFormat
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{
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/**
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* Formats a message according to the specified number value.
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* @param string $messages the candidate messages in the format of 'expr1#message1|expr2#message2|expr3#message3'.
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* See {@link CChoiceFormat} for more details.
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* @param mixed $number the number value
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* @return string the selected message
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*/
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public static function format($messages, $number)
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{
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$n=preg_match_all('/\s*([^#]*)\s*#([^\|]*)\|/',$messages.'|',$matches);
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if($n===0)
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return $messages;
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for($i=0;$i<$n;++$i)
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{
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$expression=$matches[1][$i];
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$message=$matches[2][$i];
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if($expression===(string)(int)$expression)
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{
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if($expression==$number)
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return $message;
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}
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elseif(self::evaluate(str_replace('n','$n',$expression),$number))
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return $message;
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}
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return $message; // return the last choice
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}
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/**
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* Evaluates a PHP expression with the given number value.
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* @param string $expression the PHP expression
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* @param mixed $n the number value
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* @return boolean the expression result
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*/
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protected static function evaluate($expression,$n)
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{
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return @eval("return $expression;");
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}
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}
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