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File: Font.php
<?php
/**
 * This file is part of PHPWord - A pure PHP library for reading and writing
 * word processing documents.
 *
 * PHPWord is free software distributed under the terms of the GNU Lesser
 * General Public License version 3 as published by the Free Software Foundation.
 *
 * For the full copyright and license information, please read the LICENSE
 * file that was distributed with this source code. For the full list of
 * contributors, visit https://github.com/PHPOffice/PHPWord/contributors.
 *
 * @see         https://github.com/PHPOffice/PHPWord
 * @copyright   2010-2018 PHPWord contributors
 * @license     http://www.gnu.org/licenses/lgpl.txt LGPL version 3
 */

namespace PhpOffice\PhpWord\Writer\HTML\Style;

use PhpOffice\PhpWord\Style\Font as FontStyle;

/**
 * Font style HTML writer
 *
 * @since 0.10.0
 */
class Font extends AbstractStyle
{
    /**
     * Write style
     *
     * @return string
     */
    public function write()
    {
        $style = $this->getStyle();
        if (!$style instanceof FontStyle) {
            return '';
        }
        $css = array();

        $font = $style->getName();
        $size = $style->getSize();
        $color = $style->getColor();
        $fgColor = $style->getFgColor();
        $underline = $style->getUnderline() != FontStyle::UNDERLINE_NONE;
        $lineThrough = $style->isStrikethrough() || $style->isDoubleStrikethrough();

        $css['font-family'] = $this->getValueIf($font !== null, "'{$font}'");
        $css['font-size'] = $this->getValueIf($size !== null, "{$size}pt");
        $css['color'] = $this->getValueIf($color !== null, "#{$color}");
        $css['background'] = $this->getValueIf($fgColor != '', $fgColor);
        $css['font-weight'] = $this->getValueIf($style->isBold(), 'bold');
        $css['font-style'] = $this->getValueIf($style->isItalic(), 'italic');
        $css['vertical-align'] = '';
        $css['vertical-align'] .= $this->getValueIf($style->isSuperScript(), 'super');
        $css['vertical-align'] .= $this->getValueIf($style->isSubScript(), 'sub');
        $css['text-decoration'] = '';
        $css['text-decoration'] .= $this->getValueIf($underline, 'underline ');
        $css['text-decoration'] .= $this->getValueIf($lineThrough, 'line-through ');
        $css['text-transform'] = $this->getValueIf($style->isAllCaps(), 'uppercase');
        $css['font-variant'] = $this->getValueIf($style->isSmallCaps(), 'small-caps');

        $spacing = $style->getSpacing();
        $css['letter-spacing'] = $this->getValueIf(!is_null($spacing), ($spacing / 20) . 'pt');

        return $this->assembleCss($css);
    }
}