TocFormatter.php in TOC API 8

Namespace

Drupal\toc_api

File

src/TocFormatter.php

<?php

namespace Drupal\toc_api;


/**
 * Defines a service for formatting a table of content's headers, numbering, and ids..
 */
class TocFormatter implements TocFormatterInterface {

  /**
   * {@inheritdoc}
   */
  public function convertStringToId($text) {

    // Replace accents with their counterparts.
    $text = strtr($text, [
      'Š' => 'S',
      'š' => 's',
      'Đ' => 'Dj',
      'đ' => 'dj',
      'Ž' => 'Z',
      'ž' => 'z',
      'Č' => 'C',
      'č' => 'c',
      'Ć' => 'C',
      'ć' => 'c',
      'À' => 'A',
      'Á' => 'A',
      'Â' => 'A',
      'Ã' => 'A',
      'Ä' => 'A',
      'Å' => 'A',
      'Æ' => 'A',
      'Ç' => 'C',
      'È' => 'E',
      'É' => 'E',
      'Ê' => 'E',
      'Ë' => 'E',
      'Ì' => 'I',
      'Í' => 'I',
      'Î' => 'I',
      'Ï' => 'I',
      'Ñ' => 'N',
      'Ò' => 'O',
      'Ó' => 'O',
      'Ô' => 'O',
      'Õ' => 'O',
      'Ö' => 'O',
      'Ø' => 'O',
      'Ù' => 'U',
      'Ú' => 'U',
      'Û' => 'U',
      'Ü' => 'U',
      'Ý' => 'Y',
      'Þ' => 'B',
      'ß' => 'Ss',
      'à' => 'a',
      'á' => 'a',
      'â' => 'a',
      'ã' => 'a',
      'ä' => 'a',
      'å' => 'a',
      'æ' => 'a',
      'ç' => 'c',
      'è' => 'e',
      'é' => 'e',
      'ê' => 'e',
      'ë' => 'e',
      'ì' => 'i',
      'í' => 'i',
      'î' => 'i',
      'ï' => 'i',
      'ð' => 'o',
      'ñ' => 'n',
      'ò' => 'o',
      'ó' => 'o',
      'ô' => 'o',
      'õ' => 'o',
      'ö' => 'o',
      'ø' => 'o',
      'ù' => 'u',
      'ú' => 'u',
      'û' => 'u',
      'ý' => 'y',
      'þ' => 'b',
      'ÿ' => 'y',
      'Ŕ' => 'R',
      'ŕ' => 'r',
    ]);

    // Lowercase.
    $text = strtolower($text);

    // Remove apostrophes.
    $text = str_replace("'s ", ' ', $text);

    // Replace non letter or digits by -.
    $text = preg_replace('~[^\\pL\\d]+~u', '-', $text);

    // Remove number from beginning.
    // https://css-tricks.com/ids-cannot-start-with-a-number/
    $text = preg_replace('/^\\d+/', '-', $text);

    // Trim.
    $text = trim($text, '-');

    // Remove unwanted characters.
    $text = preg_replace('/[^-\\w]+/', '', $text);
    return $text;
  }

  /**
   * {@inheritdoc}
   */
  public function convertNumberToListTypeValue($number, $type) {
    $case_func = NULL;

    // Check if type should upper or lower cased.
    if (preg_match('/^(upper|lower)-(.+)$/', $type, $match)) {
      $type = $match[2];
      $case_func = 'strto' . $match[1];
    }
    if ($number === 0) {
      return '0';
    }
    switch ($type) {
      case 'roman':
        $value = self::convertNumberToRomanNumeral($number);
        break;
      case 'alpha':
        $value = self::convertNumberToLetter($number);
        break;
      default:
        $value = (string) $number;
        break;
    }
    return $case_func ? $case_func($value) : $value;
  }

  /**
   * {@inheritdoc}
   */
  public function convertNumberToRomanNumeral($number) {
    $roman_numerals = [
      'M' => 1000,
      'CM' => 900,
      'D' => 500,
      'CD' => 400,
      'C' => 100,
      'XC' => 90,
      'L' => 50,
      'XL' => 40,
      'X' => 10,
      'IX' => 9,
      'V' => 5,
      'IV' => 4,
      'I' => 1,
    ];
    $result = '';
    foreach ($roman_numerals as $roman_numeral => $roman_number) {
      $matches = intval($number / $roman_number);
      $result .= str_repeat($roman_numeral, $matches);
      $number = $number % $roman_number;
    }
    return $result;
  }

  /**
   * {@inheritdoc}
   */
  public function convertNumberToLetter($number) {
    static $letters = [
      'a',
      'b',
      'c',
      'd',
      'e',
      'f',
      'g',
      'h',
      'i',
      'j',
      'k',
      'l',
      'm',
      'n',
      'o',
      'p',
      'q',
      'r',
      's',
      't',
      'u',
      'v',
      'w',
      'x',
      'y',
      'z',
    ];
    return $letters[($number - 1) % 26];
  }

  /**
   * {@inheritdoc}
   */
  public function convertHeaderKeysToValues(array $header_keys, array $options) {
    if (!empty($options['number_path_truncate'])) {

      // Remove empty numbers from the beginning and end of the $header_keys
      // array but not the middle of it. This is why we can't just use
      // array_filter().
      foreach ($header_keys as $header_tag => $header_number) {
        if ($header_number === 0) {
          unset($header_keys[$header_tag]);
        }
        else {
          break;
        }
      }
      $header_keys = array_reverse($header_keys, TRUE);
      foreach ($header_keys as $header_tag => $header_number) {
        if ($header_number === 0) {
          unset($header_keys[$header_tag]);
        }
        else {
          break;
        }
      }
      $header_keys = array_reverse($header_keys, TRUE);
    }
    $header_parts = [];
    foreach ($header_keys as $header_tag => $header_number) {
      $header_options = $options['headers'][$header_tag];
      $header_parts[$header_tag] = self::convertNumberToListTypeValue($header_number, $header_options['number_type']);
    }
    return $header_parts;
  }

  /**
   * {@inheritdoc}
   */
  public function convertAllowedTagsToArray($allowed_tags) {
    return explode(' ', trim(preg_replace('/(^\\s*<|\\s*>$|>\\s*<)/', ' ', $allowed_tags)));
  }

}

Classes

Name	Description
TocFormatter	Defines a service for formatting a table of content's headers, numbering, and ids..