126 lines
4.4 KiB
PHP
126 lines
4.4 KiB
PHP
<?php
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/**
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* EasyRdf
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*
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* LICENSE
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*
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* Copyright (c) 2009-2013 Nicholas J Humfrey. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author 'Nicholas J Humfrey" may be used to endorse or
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* promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* @package EasyRdf
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* @copyright Copyright (c) 2009-2013 Nicholas J Humfrey
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* @license http://www.opensource.org/licenses/bsd-license.php
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*/
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/**
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* Class that represents an RDF Literal of datatype xsd:decimal
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*
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* @package EasyRdf
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* @link http://www.w3.org/TR/xmlschema-2/#decimal
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* @copyright Copyright (c) 2009-2013 Nicholas J Humfrey
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* @license http://www.opensource.org/licenses/bsd-license.php
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*/
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class EasyRdf_Literal_Decimal extends EasyRdf_Literal
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{
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/**
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* written according to http://www.w3.org/TR/xmlschema-2/#decimal
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*/
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const DECIMAL_REGEX = '^([+\-]?)(((\d+)?\.(\d+))|((\d+)\.?))$';
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/** Constructor for creating a new decimal literal
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*
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* @param double|int|string $value The value of the literal
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* @param string $lang Should be null (literals with a datatype can't have a language)
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* @param string $datatype Optional datatype (default 'xsd:decimal')
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*
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* @throws UnexpectedValueException
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* @return EasyRdf_Literal_Decimal
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*/
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public function __construct($value, $lang = null, $datatype = null)
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{
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if (is_string($value)) {
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self::validate($value);
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} elseif (is_double($value) or is_int($value)) {
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$locale_data = localeconv();
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$value = str_replace($locale_data['decimal_point'], '.', strval($value));
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} else {
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throw new UnexpectedValueException('EasyRdf_Literal_Decimal expects int/float/string as value');
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}
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$value = self::canonicalise($value);
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parent::__construct($value, null, $datatype);
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}
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/** Return the value of the literal cast to a PHP string
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*
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* @return string
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*/
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public function getValue()
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{
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return strval($this->value);
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}
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/**
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* @param string $value
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*
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* @throws UnexpectedValueException
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*/
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public static function validate($value)
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{
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if (!mb_ereg_match(self::DECIMAL_REGEX, $value)) {
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throw new UnexpectedValueException("'{$value}' doesn't look like a valid decimal");
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}
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}
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/**
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* Converts valid xsd:decimal literal to Canonical representation
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* see http://www.w3.org/TR/xmlschema-2/#decimal
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*
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* @param string $value Valid xsd:decimal literal
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*
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* @return string
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*/
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public static function canonicalise($value)
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{
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$pieces = array();
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mb_ereg(self::DECIMAL_REGEX, $value, $pieces);
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$sign = $pieces[1] === '-' ? '-' : ''; // '+' is not allowed
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$integer = ltrim(($pieces[4] !== false) ? $pieces[4] : $pieces[7], '0');
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$fractional = rtrim($pieces[5], '0');
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if (empty($integer)) {
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$integer = '0';
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}
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if (empty($fractional)) {
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$fractional = '0';
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}
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return "{$sign}{$integer}.{$fractional}";
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}
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}
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