piratepoet/lib/Newsletter/Renderer/StylesHelper.php

<?php

namespace MailPoet\Newsletter\Renderer;

class StylesHelper {
  public static $cssAttributes = [
    'backgroundColor' => 'background-color',
    'fontColor' => 'color',
    'fontFamily' => 'font-family',
    'textDecoration' => 'text-decoration',
    'textAlign' => 'text-align',
    'fontSize' => 'font-size',
    'fontWeight' => 'font-weight',
    'borderWidth' => 'border-width',
    'borderStyle' => 'border-style',
    'borderColor' => 'border-color',
    'borderRadius' => 'border-radius',
    'lineHeight' => 'line-height',
    'msoLineHeightAlt' => 'mso-line-height-alt',
    'msoFontSize' => 'mso-ansi-font-size',
  ];
  public static $font = [
    'Arial' => "Arial, 'Helvetica Neue', Helvetica, sans-serif",
    'Comic Sans MS' => "'Comic Sans MS', 'Marker Felt-Thin', Arial, sans-serif",
    'Courier New' => "'Courier New', Courier, 'Lucida Sans Typewriter', 'Lucida Typewriter', monospace",
    'Georgia' => "Georgia, Times, 'Times New Roman', serif",
    'Lucida' => "'Lucida Sans Unicode', 'Lucida Grande', sans-serif",
    'Tahoma' => 'Tahoma, Verdana, Segoe, sans-serif',
    'Times New Roman' => "'Times New Roman', Times, Baskerville, Georgia, serif",
    'Trebuchet MS' => "'Trebuchet MS', 'Lucida Grande', 'Lucida Sans Unicode', 'Lucida Sans', Tahoma, sans-serif",
    'Verdana' => 'Verdana, Geneva, sans-serif',
    'Arvo' => 'arvo, courier, georgia, serif',
    'Lato' => "lato, 'helvetica neue', helvetica, arial, sans-serif",
    'Lora' => "lora, georgia, 'times new roman', serif",
    'Merriweather' => "merriweather, georgia, 'times new roman', serif",
    'Merriweather Sans' => "'merriweather sans', 'helvetica neue', helvetica, arial, sans-serif",
    'Noticia Text' => "'noticia text', georgia, 'times new roman', serif",
    'Open Sans' => "'open sans', 'helvetica neue', helvetica, arial, sans-serif",
    'Playfair Display' => "'playfair display', georgia, 'times new roman', serif",
    'Roboto' => "roboto, 'helvetica neue', helvetica, arial, sans-serif",
    'Source Sans Pro' => "'source sans pro', 'helvetica neue', helvetica, arial, sans-serif",
    'Oswald' => "Oswald, 'Trebuchet MS', 'Lucida Grande', 'Lucida Sans Unicode', 'Lucida Sans', Tahoma, sans-serif",
    'Raleway' => "Raleway, 'Century Gothic', CenturyGothic, AppleGothic, sans-serif",
    'Permanent Marker' => "'Permanent Marker', Tahoma, Verdana, Segoe, sans-serif",
    'Pacifico' => "Pacifico, 'Arial Narrow', Arial, sans-serif",
  ];
  public static $customFonts = [
    'Arvo',
    'Lato',
    'Lora',
    'Merriweather',
    'Merriweather Sans',
    'Noticia Text',
    'Open Sans',
    'Playfair Display',
    'Roboto',
    'Source Sans Pro',
    'Oswald',
    'Raleway',
    'Permanent Marker',
    'Pacifico',
  ];
  public static $defaultLineHeight = 1.6;
  public static $headingMarginMultiplier = 0.3;
  public static $paddingWidth = 20;

  public static function getBlockStyles($element, $ignoreSpecificStyles = false) {
    if (!isset($element['styles']['block'])) {
      return;
    }
    return self::getStyles($element['styles'], 'block', $ignoreSpecificStyles);
  }

  public static function getStyles($data, $type, $ignoreSpecificStyles = false) {
    $styles = array_map(function($attribute, $style) use ($ignoreSpecificStyles) {
      if (!$ignoreSpecificStyles || !in_array($attribute, $ignoreSpecificStyles)) {
        $style = StylesHelper::applyFontFamily($attribute, $style);
        return StylesHelper::translateCSSAttribute($attribute) . ': ' . $style . ';';
      }
    }, array_keys($data[$type]), $data[$type]);
    return implode('', $styles);
  }

  public static function translateCSSAttribute($attribute) {
    return (array_key_exists($attribute, self::$cssAttributes)) ?
      self::$cssAttributes[$attribute] :
      $attribute;
  }

  public static function setStyle(array $style, string $selector): string {
    $css = $selector . '{' . PHP_EOL;
    $style = self::applyHeadingMargin($style, $selector);
    $style = self::applyLineHeight($style, $selector);
    foreach ($style as $attribute => $individualStyle) {
      $individualStyle = self::applyFontFamily($attribute, $individualStyle);
      $css .= self::translateCSSAttribute($attribute) . ':' . $individualStyle . ';' . PHP_EOL;
    }
    $css .= '}' . PHP_EOL;
    return $css;
  }

  public static function applyTextAlignment($block) {
    if (is_array($block)) {
      $textAlignment = isset($block['styles']['block']['textAlign']) ?
        strtolower($block['styles']['block']['textAlign']) :
        '';
      if (preg_match('/center|right|justify/i', $textAlignment)) {
        return $block;
      }
      $block['styles']['block']['textAlign'] = 'left';
      return $block;
    }
    return (preg_match('/text-align.*?[center|justify|right]/i', $block)) ?
      $block :
      $block . 'text-align:left;';
  }

  /**
   * Join styles and makes sure they are separated by ;
   */
  public static function joinStyles(?string $styles1, ?string $styles2): string {
    if ($styles1 === null) $styles1 = '';
    if ($styles2 === null) $styles2 = '';

    $style = trim($styles1);
    if (
      (strlen($style) > 0)
      && (substr($style, -1) !== ';')
    ) $style .= ';';
    $style .= $styles2;
    return $style;
  }

  public static function applyFontFamily($attribute, $style) {
    if ($attribute !== 'fontFamily') return $style;
    return (isset(self::$font[$style])) ?
        self::$font[$style] :
        self::$font['Arial'];
  }

  public static function applyHeadingMargin(array $style, string $selector): array {
    if (!preg_match('/h[1-4]/i', $selector)) return $style;
    $fontSize = (int)$style['fontSize'];
    $style['margin'] = sprintf('0 0 %spx 0', self::$headingMarginMultiplier * $fontSize);
    return $style;
  }

  public static function applyLineHeight(array $style, string $selector): array {
    if (!preg_match('/mailpoet_paragraph|h[1-4]/i', $selector)) return $style;
    $lineHeight = isset($style['lineHeight']) ? (float)$style['lineHeight'] : self::$defaultLineHeight;
    $fontSize = (int)$style['fontSize'];
    $msoLineHeight = round($lineHeight * $fontSize);
    if ($msoLineHeight % 2 === 1) {
      $msoLineHeight++;
    }
    $msoFontSize = $fontSize;
    if ($msoFontSize % 2 === 1) {
      $msoFontSize++;
    }
    $style['msoLineHeightAlt'] = sprintf('%spx', $msoLineHeight);
    $style = ['msoFontSize' => sprintf('%spx', $msoFontSize)] + $style;
    $style['lineHeight'] = sprintf('%spx', $lineHeight * $fontSize);

    return $style;
  }

  private static function getCustomFontsNames($styles) {
    $fontNames = [];
    foreach ($styles as $style) {
      if (isset($style['fontFamily']) && in_array($style['fontFamily'], self::$customFonts)) {
        $fontNames[$style['fontFamily']] = true;
      }
    }
    return array_keys($fontNames);
  }

  public static function getCustomFontsLinks($styles) {
    $links = [];
    foreach (self::getCustomFontsNames($styles) as $name) {
      $links[] = urlencode($name) . ':400,400i,700,700i';
    }
    if (!count($links)) {
      return '';
    }

    // see https://stackoverflow.com/a/48214207
    return '<!--[if !mso]><!-- --><link href="https://fonts.googleapis.com/css?family='
      . implode("|", $links)
      . '" rel="stylesheet"><!--<![endif]-->';
  }
}