From 4835704a04cf5aa5ec71a8aef902d54b9c6cae82 Mon Sep 17 00:00:00 2001
From: wei <>
Date: Fri, 6 Jan 2006 04:42:44 +0000
Subject: Adding I18N support.

---
 framework/I18N/core/ChoiceFormat.php | 186 +++++++++++++++++++++++++++++++++++
 1 file changed, 186 insertions(+)
 create mode 100644 framework/I18N/core/ChoiceFormat.php

(limited to 'framework/I18N/core/ChoiceFormat.php')

diff --git a/framework/I18N/core/ChoiceFormat.php b/framework/I18N/core/ChoiceFormat.php
new file mode 100644
index 00000000..29391135
--- /dev/null
+++ b/framework/I18N/core/ChoiceFormat.php
@@ -0,0 +1,186 @@
+<?php
+
+/**
+ * ChoiceFormat class file.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the BSD License.
+ *
+ * Copyright(c) 2004 by Qiang Xue. All rights reserved.
+ *
+ * To contact the author write to {@link mailto:qiang.xue@gmail.com Qiang Xue}
+ * The latest version of PRADO can be obtained from:
+ * {@link http://prado.sourceforge.net/}
+ *
+ * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
+ * @version $Revision: 1.1 $  $Date: 2005/01/11 07:19:39 $
+ * @package System.I18N.core
+ */
+
+
+/**
+ * ChoiceFormat class.
+ * 
+ * ChoiceFormat converts between ranges of numeric values and string 
+ * names for those ranges.
+ *
+ * A ChoiceFormat splits the real number line -Inf to +Inf into two or 
+ * more contiguous ranges. Each range is mapped to a string. 
+ * ChoiceFormat is generally used in a MessageFormat for displaying 
+ * grammatically correct plurals such as "There are 2 files."
+ *
+ * <code>
+ *	$string = '[0] are no files |[1] is one file |(1,Inf] are {number} files';
+ *  
+ *  $formatter = new MessageFormat(...); //init for a source
+ *	$translated = $formatter->format($string);
+ *
+ *  $choice = new ChoiceFormat();
+ * 	echo $choice->format($translated, 0); //shows "are no files"
+ * </code>
+ *
+ * The message/string choices are separated by the pipe "|" followed
+ * by a set notation of the form
+ *  # <t>[1,2]</t> -- accepts values between 1 and 2, inclusive.
+ *  # <t>(1,2)</t> -- accepts values between 1 and 2, excluding 1 and 2.
+ *  # <t>{1,2,3,4}</t> -- only values defined in the set are accepted.
+ *  # <t>[-Inf,0)</t> -- accepts value greater or equal to negative infinity 
+ *                       and strictly less than 0
+ * Any non-empty combinations of the delimiters of square and round brackets
+ * are acceptable.
+ *
+ * @author Xiang Wei Zhuo <weizhuo[at]gmail[dot]com>
+ * @version v1.0, last update on Fri Dec 24 20:46:16 EST 2004
+ * @package System.I18N.core
+ */
+class ChoiceFormat
+{
+	/**
+	 * The pattern to validate a set notation
+	 * @var string 
+	 */
+	protected $validate = '/[\(\[\{]|[-Inf\d]+|,|[\+Inf\d]+|[\)\]\}]/ms';
+
+	/**
+	 * The pattern to parse the formatting string.
+	 * @var string 
+	 */
+	protected $parse = '/\s?\|?([\(\[\{]([-Inf\d]+,?[\+Inf\d]*)+[\)\]\}])\s?/';
+
+	/**
+	 * The value for positive infinity.
+	 * @var float 
+	 */
+	protected $inf;
+
+
+	/**
+	 * Constructor.
+	 */	
+	function __construct()
+	{
+		$this->inf = -log(0);
+	}
+
+
+	/**
+	 * Determine if the given number belongs to a given set
+	 * @param float the number to test.
+	 * @param string the set, in set notation.
+	 * @return boolean true if number is in the set, false otherwise.
+	 */	
+	function isValid($number, $set)
+	{
+		$n = preg_match_all($this->validate,$set,$matches,PREG_SET_ORDER);
+		
+		if($n < 3) throw new Exception("Invalid set \"{$set}\"");
+		
+		$leftBracket = $matches[0][0];
+		$rightBracket = $matches[$n-1][0];
+
+		$i = 0;
+		$elements = array();
+		
+		foreach($matches as $match)
+		{
+			$string = $match[0];
+			if($i != 0 && $i != $n-1 && $string !== ',')
+			{
+				if($string == '-Inf')
+					$elements[] = -1*$this->inf;
+				else if ($string == '+Inf' || $string == 'Inf')
+					$elements[] = $this->inf;
+				else
+					$elements[] = floatval($string);
+			}
+			$i++;
+		}
+		$total = count($elements);
+		$number = floatval($number);
+
+		if($leftBracket == '{' && $rightBracket == '}')
+			return in_array($number, $elements);
+
+		$left = false;
+		if($leftBracket == '[')
+			$left = $number >= $elements[0];
+		else if ($leftBracket == '(')
+			$left = $number > $elements[0];
+
+		$right = false;
+		if($rightBracket==']')
+			$right = $number <= $elements[$total-1];
+		else if($rightBracket == ')')
+			$right = $number < $elements[$total-1];
+		
+		if($left && $right) return true;	
+
+		return false;
+	}	
+
+
+	/**
+	 * Parse a choice string and get a list of sets and a list of strings 
+	 * corresponding to the sets.
+	 * @param string the string containing the choices
+	 * @return array array($sets, $strings)
+	 */	
+	function parse($string)
+	{
+		$n = preg_match_all($this->parse,$string,$matches, PREG_OFFSET_CAPTURE);
+		$sets = array();
+		foreach($matches[1] as $match)
+			$sets[] = $match[0];
+		$offset = $matches[0];
+		$strings = array();
+		for($i = 0; $i < $n; $i++)
+		{
+			$len = strlen($offset[$i][0]);
+			$begin = $i == 0? $len : $offset[$i][1] + $len;
+			$end = $i == $n-1 ? strlen($string) : $offset[$i+1][1];	
+			$strings[] = substr($string, $begin, $end - $begin);
+		}
+		return array($sets, $strings);
+	}
+
+	/**
+	 * For the choice string, and a number, find and return the 
+	 * string that satisfied the set within the choices.
+	 * @param string the choices string.
+	 * @param float the number to test.
+	 * @return string the choosen string.
+	 */		
+	public function format($string, $number)
+	{
+		list($sets, $strings) = $this->parse($string);
+		$total = count($sets);
+		for($i = 0; $i < $total; $i++)
+		{
+			if($this->isValid($number, $sets[$i]))
+				return $strings[$i];
+		}
+		return false;
+	}
+}
+
+?>
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