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<?php |
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/* |
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* citeproc-php |
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* |
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* @link http://github.com/seboettg/citeproc-php for the source repository |
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* @copyright Copyright (c) 2017 Sebastian Böttger. |
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* @license https://opensource.org/licenses/MIT |
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*/ |
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namespace Seboettg\CiteProc\Util; |
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use Seboettg\CiteProc\Style\Options\PageRangeFormats; |
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/** |
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* Class PageHelper |
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* @package Seboettg\CiteProc\Util |
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* @author Sebastian Böttger <[email protected]> |
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*/ |
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class PageHelper |
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{ |
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public static function processPageRangeFormats($ranges, $pageRangeFormat) |
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{ |
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list($from, $to) = $ranges; |
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if (!empty($pageRangeFormat) ) { |
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switch ($pageRangeFormat) { |
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case PageRangeFormats::MINIMAL: |
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$resTo = self::renderMinimal($from, $to); |
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break; |
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case PageRangeFormats::MINIMAL_TWO: |
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if (strlen($to) > 2) { |
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$resTo = self::renderMinimal($from, $to, strlen($to)-2); |
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} else { |
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$resTo = $to; |
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} |
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break; |
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case PageRangeFormats::CHICAGO: |
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$resTo = self::renderChicago($from, $to); |
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break; |
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case PageRangeFormats::EXPANDED: |
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default: |
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$resTo = $to; |
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} |
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return "$from-$resTo"; |
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} |
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return "$from-$to"; |
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} |
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/** |
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* |
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* @param $from |
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* @param $to |
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* @param int $limit |
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* @return string |
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*/ |
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private static function renderMinimal($from, $to, $limit = 1) |
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{ |
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$resTo = ""; |
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for ($i = strlen($to) - 1; $i >= $limit; --$i) { |
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$digitTo = $to{$i}; |
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$digitFrom = $from{$i}; |
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if ($digitTo !== $digitFrom) { |
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$resTo = $digitTo . $resTo; |
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} |
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} |
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return $resTo; |
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} |
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private static function renderChicago($from, $to) |
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{ |
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if ($from > 100 && ($from % 100 > 0) && intval(($from / 100), 10) === intval(($to / 100), 10)) { |
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return "" . ($to % 100); |
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} else if ($from >= 10000) { |
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return "" . ($to % 1000); |
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} |
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return $to; |
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} |
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} |
seboettg /
citeproc-php
