RISWriter.php

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<?php
namespace LibRIS;

class RISWriter {

        public function __construct() { }


        public function writeRecords($records) {
                $buffer = array();
                foreach ($records as $record) {
                        $buffer[] = $this->writeRecord($record);
                }

                return implode(RISReader::RIS_EOL, $buffer);
        }


        public function writeRecord($tags) {
                $buffer = array();
                $fmt = '%s  - %s';
                $buffer[] = sprintf($fmt, 'TY', $tags['TY'][0]);
                unset($tags['TY']);
                foreach ($tags as $tag => $values) {
                        foreach ($values as $value) {
                                $buffer[] = sprintf($fmt, $tag, $value);
                        }
                }
                $buffer[] = 'ER  - ';

                return implode(RISReader::RIS_EOL, $buffer);
        }
}