8 * Copyright (c) 2009-2013 Nicholas J Humfrey. All rights reserved.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright notice,
15 * this list of conditions and the following disclaimer in the documentation
16 * and/or other materials provided with the distribution.
17 * 3. The name of the author 'Nicholas J Humfrey" may be used to endorse or
18 * promote products derived from this software without specific prior
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
22 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
25 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31 * POSSIBILITY OF SUCH DAMAGE.
34 * @copyright Copyright (c) 2009-2013 Nicholas J Humfrey
35 * @license http://www.opensource.org/licenses/bsd-license.php
39 * Class that represents an RDF Literal of datatype xsd:decimal
42 * @link http://www.w3.org/TR/xmlschema-2/#decimal
43 * @copyright Copyright (c) 2009-2013 Nicholas J Humfrey
44 * @license http://www.opensource.org/licenses/bsd-license.php
46 class EasyRdf_Literal_Decimal extends EasyRdf_Literal
49 * written according to http://www.w3.org/TR/xmlschema-2/#decimal
51 const DECIMAL_REGEX = '^([+\-]?)(((\d+)?\.(\d+))|((\d+)\.?))$';
53 /** Constructor for creating a new decimal literal
55 * @param double|int|string $value The value of the literal
56 * @param string $lang Should be null (literals with a datatype can't have a language)
57 * @param string $datatype Optional datatype (default 'xsd:decimal')
59 * @throws UnexpectedValueException
60 * @return EasyRdf_Literal_Decimal
62 public function __construct($value, $lang = null, $datatype = null)
64 if (is_string($value)) {
65 self::validate($value);
66 } elseif (is_double($value) or is_int($value)) {
67 $locale_data = localeconv();
68 $value = str_replace($locale_data['decimal_point'], '.', strval($value));
70 throw new UnexpectedValueException('EasyRdf_Literal_Decimal expects int/float/string as value');
73 $value = self::canonicalise($value);
75 parent::__construct($value, null, $datatype);
78 /** Return the value of the literal cast to a PHP string
82 public function getValue()
84 return strval($this->value);
88 * @param string $value
90 * @throws UnexpectedValueException
92 public static function validate($value)
94 if (!mb_ereg_match(self::DECIMAL_REGEX, $value)) {
95 throw new UnexpectedValueException("'{$value}' doesn't look like a valid decimal");
100 * Converts valid xsd:decimal literal to Canonical representation
101 * see http://www.w3.org/TR/xmlschema-2/#decimal
103 * @param string $value Valid xsd:decimal literal
107 public static function canonicalise($value)
110 mb_ereg(self::DECIMAL_REGEX, $value, $pieces);
112 $sign = $pieces[1] === '-' ? '-' : ''; // '+' is not allowed
113 $integer = ltrim(($pieces[4] !== false) ? $pieces[4] : $pieces[7], '0');
114 $fractional = rtrim($pieces[5], '0');
116 if (empty($integer)) {
120 if (empty($fractional)) {
124 return "{$sign}{$integer}.{$fractional}";