Issue #3389133 by pivica: Add service for extraction dimensions from SVG image

bs_lib.services.yml

+services:
+  bs_lib.svg_tools:
+    class: Drupal\bs_lib\SvgTools

src/SvgTools.php

+<?php
+
+namespace Drupal\bs_lib;
+
+/**
+ * Defines a service with some handy SVG tools.
+ */
+
+class SvgTools {
+
+  /**
+   * Extracts width and height dimensions from an SVG content string.
+   *
+   * This function attempts to retrieve the width and height attributes from the
+   * SVG content. If these attributes are not found, it falls back to extracting
+   * the dimensions from the viewBox attribute. The extracted dimensions are
+   * returned as an associative array with 'width' and 'height' keys.
+   *
+   * @param string $svg_content
+   *   The SVG content to extract dimensions from.
+   *
+   * @return array|false
+   *   An associative array containing 'width' and 'height' dimensions, or FALSE
+   *   if width or height are not found.
+   */
+  public function getDimensions(string $svg_content)
+  {
+    $width = NULL;
+    $height = NULL;
+
+    // First try to get dimensions from width and height attribute.
+    preg_match('/<svg[^>]*width=["\']?([^"\']+)["\']?[^>]*>/i', $svg_content, $widthMatches);
+    if (!empty($widthMatches[1])) {
+      $width = $widthMatches[1];
+    }
+    preg_match('/<svg[^>]*height=["\']?([^"\']+)["\']?[^>]*>/i', $svg_content, $heightMatches);
+    if (!empty($heightMatches[1])) {
+      $height = $heightMatches[1];
+    }
+
+    // If width or height attributes were not found, try to extract from
+    // viewBox attribute.
+    if (!$width || !$height) {
+      preg_match('/<svg[^>]*viewBox=["\']?([^"\']+)["\']?[^>]*>/i', $svg_content, $viewBoxMatches);
+
+      if (!empty($viewBoxMatches[1])) {
+        $viewBoxValues = explode(' ', $viewBoxMatches[1]);
+        if (count($viewBoxValues) >= 4) {
+          $width = $viewBoxValues[2];
+          $height = $viewBoxValues[3];
+        }
+      }
+    }
+
+    if (!empty($width) && !empty($height)) {
+      return [
+        'width' => $this->removeUnit($width),
+        'height' => $this->removeUnit($height),
+      ];
+    }
+
+    return FALSE;
+  }
+
+  /**
+   * Removes units from a given value and returns the numeric representation.
+   *
+   * This method takes a string value as input, removes any non-numeric and
+   * non-dot characters (excluding the dot to allow floating-point numbers),
+   * and converts the resulting string to a float.
+   *
+   * @param string $value
+   *   The input value, which may include units or be a numeric string.
+   * @return float
+   *   The numeric representation of the input value without units.
+   *
+   */
+  protected function removeUnit($value) {
+    // Remove non-numeric and non-dot characters from the value.
+    $numericValue = preg_replace('/[^0-9.]/', '', $value);
+
+    // Convert the numeric value to a float.
+    return floatval($numericValue);
+  }
+
+}