1. <?php
  3. /**
  4. * Resolves dependencies for HTML documents.
  5. *
  6. * This script aims to resolve external dependencies (CSS, JS) linked in an HTML file.
  7. * It provides a minimal solution with no external dependencies beyond core PHP.
  8. *
  9. * @param string $html_content The HTML content as a string.
  10. * @return string The HTML content with dependencies resolved (CSS and JS links updated).
  11. */
  12. function resolveDependencies(string $html_content): string
  13. {
  14. // Regex to find <link> and <script> tags.
  15. $css_regex = '/<link[^>]*rel="stylesheet"[^>]*href="([^"]*)"[^>]*>/i';
  16. $js_regex = '/<script[^>]*src="([^"]*)"[^>]*>/i';
  18. // Resolve CSS dependencies.
  19. $html_content = preg_replace_callback($css_regex, function ($matches) use ($html_content) {
  20. $href = $matches[1];
  22. // Resolve relative URLs.
  23. if (strpos($href, '/') === 0) {
  24. //Absolute URL, no changes needed.
  25. return $matches[0];
  26. } elseif (strpos($href, '.') === 0) {
  27. //Relative to current directory
  28. $href = realpath($href);
  29. if($href === false){
  30. return $matches[0]; //Keep original if realpath fails
  31. }
  32. $href = str_replace($_SERVER['DOCUMENT_ROOT'], '', $href); //remove document root
  33. if(strpos($href, '/') === 0){
  34. $href = $_SERVER['DOCUMENT_ROOT'] . $href;
  35. }
  37. } else {
  38. // Relative to parent directory
  39. $path = pathinfo($href, PATHINFO_DIRNAME);
  40. $href = $path . '/' . $href;
  41. }
  44. //Check if the resolved path is valid
  45. if (strpos($href, '.') === 0) {
  46. return $matches[0]; //keep original if invalid path
  47. }
  48. return str_replace($href, $_SERVER['DOCUMENT_ROOT'] . $href, $matches[0]); // Replace with absolute path.
  49. }, $html_content);
  51. // Resolve JavaScript dependencies.
  52. $html_content = preg_replace_callback($js_regex, function ($matches) use ($html_content) {
  53. $src = $matches[1];
  55. // Resolve relative URLs.
  56. if (strpos($src, '/') === 0) {
  57. //Absolute URL, no changes needed.
  58. return $matches[0];
  59. } elseif (strpos($src, '.') === 0) {
  60. //Relative to current directory
  61. $src = realpath($src);
  62. if($src === false){
  63. return $matches[0]; //Keep original if realpath fails
  64. }
  65. $src = str_replace($_SERVER['DOCUMENT_ROOT'], '', $src); //remove document root
  66. if(strpos($src, '/') === 0){
  67. $src = $_SERVER['DOCUMENT_ROOT'] . $src;
  68. }
  69. } else {
  70. // Relative to parent directory
  71. $path = pathinfo($src, PATHINFO_DIRNAME);
  72. $src = $path . '/' . $src;
  73. }
  77. //Check if the resolved path is valid
  78. if (strpos($src, '.') === 0) {
  79. return $matches[0]; //keep original if invalid path
  80. }
  82. return str_replace($src, $_SERVER['DOCUMENT_ROOT'] . $src, $matches[0]); // Replace with absolute path.
  83. }, $html_content);
  85. return $html_content;
  86. }
  88. //Example Usage (replace with your HTML content)
  89. $html = '<html>
  90. <head>
  91. <link rel="stylesheet" href="style.css">
  92. <link rel="stylesheet" href../styles/main.css">
  93. </head>
  94. <body>
  95. <script src="script.js"></script>
  96. <script src="js/utils.js"></script>
  97. </body>
  98. </html>';
  100. $resolved_html = resolveDependencies($html);
  101. echo $resolved_html;
  103. ?>

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