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CChoiceFormat

Package	system.i18n
Inheritance	class CChoiceFormat
Source Code	framework/i18n/CChoiceFormat.php

CChoiceFormat is a helper that chooses an appropriate message based on the specified number value. The candidate messages are given as a string in the following format:

'expr1#message1|expr2#message2|expr3#message3'

where each expression should be a valid PHP expression with 'n' as the only variable. For example, 'n==1' and 'n%10==2 && n>10' are both valid expressions. The variable 'n' will take the given number value, and if an expression evaluates true, the corresponding message will be returned.

For example, given the candidate messages 'n==1#one|n==2#two|n>2#others' and the number value 2, the resulting message will be 'two'.

For expressions like 'n==1', we can also use a shortcut '1'. So the above example candidate messages can be simplified as '1#one|2#two|n>2#others'.

In case the given number doesn't select any message, the last candidate message will be returned.

The PHP expressions will be evaluated using evaluate.

Public Methods

Hide inherited methods

Method	Description	Defined By
format()	Formats a message according to the specified number value.	CChoiceFormat

Protected Methods

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Method	Description	Defined By
evaluate()	Evaluates a PHP expression with the given number value.	CChoiceFormat

Method Details

evaluate() method

protected static boolean evaluate(string $expression, mixed $n)
$expression	string	the PHP expression
$n	mixed	the number value
{return}	boolean	the expression result

Source Code: framework/i18n/CChoiceFormat.php#72 (show)


protected static function evaluate($expression,$n)
{
    try
    {
        return @eval("return $expression;");
    }
    catch (ParseError $e)
    {
        return false;
    }
}

Evaluates a PHP expression with the given number value.

format() method

public static string format(string $messages, mixed $number)
$messages	string	the candidate messages in the format of 'expr1#message1\|expr2#message2\|expr3#message3'. See CChoiceFormat for more details.
$number	mixed	the number value
{return}	string	the selected message

Source Code: framework/i18n/CChoiceFormat.php#46 (show)


public static function format($messages, $number)
{
    $n=preg_match_all('/\s*([^#]*)\s*#([^\|]*)\|/',$messages.'|',$matches);
    if($n===0)
        return $messages;
    for($i=0;$i<$n;++$i)
    {
        $expression=$matches[1][$i];
        $message=$matches[2][$i];
        if($expression===(string)(int)$expression)
        {
            if($expression==$number)
                return $message;
        }
        elseif(self::evaluate(str_replace('n','$n',$expression),$number))
            return $message;
    }
    return $message; // return the last choice
}

Formats a message according to the specified number value.