Label.php

<?php
/*
 * citeproc-php
 *
 * @link        http://github.com/seboettg/citeproc-php for the source repository
 * @copyright   Copyright (c) 2016 Sebastian Böttger.
 * @license     https://opensource.org/licenses/MIT
 */
 
namespace Seboettg\CiteProc\Rendering;
 
use Seboettg\CiteProc\CiteProc;
use Seboettg\CiteProc\Styles\AffixesTrait;
use Seboettg\CiteProc\Styles\FormattingTrait;
use Seboettg\CiteProc\Styles\TextCaseTrait;
use SimpleXMLElement;
use stdClass;
 
class Label implements Rendering
{
    use AffixesTrait,
        FormattingTrait,
        TextCaseTrait;
 
    private $variable;
 
    private $form = "";
 
    private $plural = "contextual";
 
    public function __construct(SimpleXMLElement $node)
    {
        foreach ($node->attributes() as $attribute) {
            switch ($attribute->getName()) {
                case "variable":
                    $this->variable = (string) $attribute;
                    break;
                case "form":
                    $this->form = (string) $attribute;
                    break;
                case "plural":
                    $this->plural = (string) $attribute;
                    break;
            }
        }
 
        $this->initFormattingAttributes($node);
        $this->initAffixesAttributes($node);
        $this->initTextCaseAttributes($node);
    }
 
    public function render($data, $citationNumber = null)
    {
        $lang = (isset($data->language) && $data->language != 'en') ? $data->language : 'en';
 
        $text = '';
        $variables = explode(' ', $this->variable);
        $form = !empty($this->form) ? $this->form : 'long';
        $plural = $this->defaultPlural();
 
        if ($this->variable === "editortranslator") {
            if (isset($data->editor) && isset($data->translator)) {
                $plural = $this->getPlural($data, $plural, "editortranslator");
                $term = CiteProc::getContext()->getLocale()->filter('terms', "editortranslator", $form);
                $pluralForm = $term->{$plural};
                if (!empty($pluralForm)) {
                    $text = $pluralForm;
                }
            }
        } else {
            foreach ($variables as $variable) {
                if (isset($data->{$variable})) {
                    $plural = $this->getPlural($data, $plural, $variable);
                    $term = CiteProc::getContext()->getLocale()->filter('terms', $variable, $form);
                    $pluralForm = $term->{$plural};
                    if (!empty($data->{$variable}) && !empty($pluralForm)) {
                        $text = $pluralForm;
                        break;
                    }
                }
            }
        }
 
        return $this->formatting($text, $lang);
    }
 
    private function evaluateStringPluralism($data, $variable)
    {
        $str = isset($data->{$variable}) ? $data->{$variable} : '';
        $plural = 'single';
        if (!empty($str)) {
            switch ($variable) {
                case 'page':
                    $pageRegex = "/([a-zA-Z]*)([0-9]+)\s*(?:–|-)\s*([a-zA-Z]*)([0-9]+)/";
                    $err = preg_match($pageRegex, $str, $m);
                    if ($err !== false && count($m) == 0) {
                        $plural = 'single';
                    } elseif ($err !== false && count($m)) {
                        $plural = 'multiple';
                    }
                    break;
                default:
                    if (is_numeric($str)) {
                        return $str > 1 ? 'multiple' : 'single';
                    }
            }
        }
        return $plural;
    }
 
    public function setVariable($variable)
    {
        $this->variable = $variable;
    }
 
    protected function getPlural($data, $plural, $variable)
    {
 
        if ($variable === "editortranslator" && isset($data->editor)) {
            $var = $data->editor;
        } else {
            $var = $data->{$variable};
        }
        if (((!isset($this->plural) || empty($plural))) && !empty($var)) {
            if (is_array($var)) {
                $count = count($var);
                if ($count == 1) {
                    $plural = 'single';
                    return $plural;
                } elseif ($count > 1) {
                    $plural = 'multiple';
                    return $plural;
                }
                return $plural;
            } else {
                return $this->evaluateStringPluralism($data, $variable);
            }
        } else {
            if ($this->plural != "always") {
                $plural = $this->evaluateStringPluralism($data, $variable);
                return $plural;
            }
            return $plural;
        }
    }
 
    public function getForm()
    {
        return $this->form;
    }
 
    public function setForm($form)
    {
        $this->form = $form;
    }
 
    protected function formatting($text, $lang)
    {
        if (empty($text)) {
            return "";
        }
        if ($this->stripPeriods) {
            $text = str_replace('.', '', $text);
        }
 
        $text = preg_replace("/\s&\s/", " &#38; ", $text); //replace ampersands by html entity
        $text = $this->format($this->applyTextCase($text, $lang));
        return $this->addAffixes($text);
    }
 
    protected function defaultPlural()
    {
        $plural = "";
        switch ($this->plural) {
            case 'never':
                $plural = 'single';
                break;
            case 'always':
                $plural = 'multiple';
                break;
            case 'contextual':
            default:
        }
        return $plural;
    }
}