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<?php
/**
 * @package php-font-lib
 * @link    https://github.com/PhenX/php-font-lib
 * @author  Fabien Ménager <fabien.menager@gmail.com>
 * @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
 */

namespace FontLib;

use FontLib\Table\Type\name;
use FontLib\TrueType\File;

/**
 * Adobe Font Metrics file creation utility class.
 *
 * @package php-font-lib
 */
class AdobeFontMetrics {
  private $f;

  /**
   * @var File
   */
  private $font;

  function __construct(File $font) {
    $this->font = $font;
  }

  function write($file, $encoding = null) {
    $map_data = array();

    if ($encoding) {
      $encoding = preg_replace("/[^a-z0-9-_]/", "", $encoding);
      $map_file = dirname(__FILE__) . "/../maps/$encoding.map";
      if (!file_exists($map_file)) {
        throw new \Exception("Unkown encoding ($encoding)");
      }

      $map      = new EncodingMap($map_file);
      $map_data = $map->parse();
    }

    $this->f = fopen($file, "w+");

    $font = $this->font;

    $this->startSection("FontMetrics", 4.1);
    $this->addPair("Notice", "Converted by PHP-font-lib");
    $this->addPair("Comment", "https://github.com/PhenX/php-font-lib");

    $encoding_scheme = ($encoding ? $encoding : "FontSpecific");
    $this->addPair("EncodingScheme", $encoding_scheme);

    $records = $font->getData("name", "records");
    foreach ($records as $id => $record) {
      if (!isset(name::$nameIdCodes[$id]) || preg_match("/[\r\n]/", $record->string)) {
        continue;
      }

      $this->addPair(name::$nameIdCodes[$id], $record->string);
    }

    $os2 = $font->getData("OS/2");
    $this->addPair("Weight", ($os2["usWeightClass"] > 400 ? "Bold" : "Medium"));

    $post = $font->getData("post");
    $this->addPair("ItalicAngle", $post["italicAngle"]);
    $this->addPair("IsFixedPitch", ($post["isFixedPitch"] ? "true" : "false"));
    $this->addPair("UnderlineThickness", $font->normalizeFUnit($post["underlineThickness"]));
    $this->addPair("UnderlinePosition", $font->normalizeFUnit($post["underlinePosition"]));

    $hhea = $font->getData("hhea");

    if (isset($hhea["ascent"])) {
      $this->addPair("FontHeightOffset", $font->normalizeFUnit($hhea["lineGap"]));
      $this->addPair("Ascender", $font->normalizeFUnit($hhea["ascent"]));
      $this->addPair("Descender", $font->normalizeFUnit($hhea["descent"]));
    }
    else {
      $this->addPair("FontHeightOffset", $font->normalizeFUnit($os2["typoLineGap"]));
      $this->addPair("Ascender", $font->normalizeFUnit($os2["typoAscender"]));
      $this->addPair("Descender", -abs($font->normalizeFUnit($os2["typoDescender"])));
    }

    $head = $font->getData("head");
    $this->addArray("FontBBox", array(
      $font->normalizeFUnit($head["xMin"]),
      $font->normalizeFUnit($head["yMin"]),
      $font->normalizeFUnit($head["xMax"]),
      $font->normalizeFUnit($head["yMax"]),
    ));

    $glyphIndexArray = $font->getUnicodeCharMap();

    if ($glyphIndexArray) {
      $hmtx  = $font->getData("hmtx");
      $names = $font->getData("post", "names");

      $this->startSection("CharMetrics", count($hmtx));

      if ($encoding) {
        foreach ($map_data as $code => $value) {
          list($c, $name) = $value;

          if (!isset($glyphIndexArray[$c])) {
            continue;
          }

          $g = $glyphIndexArray[$c];

          if (!isset($hmtx[$g])) {
            $hmtx[$g] = $hmtx[0];
          }

          $this->addMetric(array(
            "C"  => ($code > 255 ? -1 : $code),
            "WX" => $font->normalizeFUnit($hmtx[$g][0]),
            "N"  => $name,
          ));
        }
      }
      else {
        foreach ($glyphIndexArray as $c => $g) {
          if (!isset($hmtx[$g])) {
            $hmtx[$g] = $hmtx[0];
          }

          $this->addMetric(array(
            "U"  => $c,
            "WX" => $font->normalizeFUnit($hmtx[$g][0]),
            "N"  => (isset($names[$g]) ? $names[$g] : sprintf("uni%04x", $c)),
            "G"  => $g,
          ));
        }
      }

      $this->endSection("CharMetrics");

      $kern = $font->getData("kern", "subtable");
      $tree = is_array($kern) ? $kern["tree"] : null;

      if (!$encoding && is_array($tree)) {
        $this->startSection("KernData");
        $this->startSection("KernPairs", count($tree, COUNT_RECURSIVE) - count($tree));

        foreach ($tree as $left => $values) {
          if (!is_array($values)) {
            continue;
          }
          if (!isset($glyphIndexArray[$left])) {
            continue;
          }

          $left_gid = $glyphIndexArray[$left];

          if (!isset($names[$left_gid])) {
            continue;
          }

          $left_name = $names[$left_gid];

          $this->addLine("");

          foreach ($values as $right => $value) {
            if (!isset($glyphIndexArray[$right])) {
              continue;
            }

            $right_gid = $glyphIndexArray[$right];

            if (!isset($names[$right_gid])) {
              continue;
            }

            $right_name = $names[$right_gid];
            $this->addPair("KPX", "$left_name $right_name $value");
          }
        }

        $this->endSection("KernPairs");
        $this->endSection("KernData");
      }
    }

    $this->endSection("FontMetrics");
  }

  function addLine($line) {
    fwrite($this->f, "$line\n");
  }

  function addPair($key, $value) {
    $this->addLine("$key $value");
  }

  function addArray($key, $array) {
    $this->addLine("$key " . implode(" ", $array));
  }

  function addMetric($data) {
    $array = array();
    foreach ($data as $key => $value) {
      $array[] = "$key $value";
    }
    $this->addLine(implode(" ; ", $array));
  }

  function startSection($name, $value = "") {
    $this->addLine("Start$name $value");
  }

  function endSection($name) {
    $this->addLine("End$name");
  }
}

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