Separate directives into processing stages

lib/SitePattern.php

@@ -7,17 +7,14 @@ declare(strict_types=1);
 namespace MensBeam\FullText;
 
 class SitePattern {
-    public $title = [];
+    public $preParse = [];
-    public $body = [];
+    public $cleanUp = [];
-    public $date = [];
+    public $readOut = [];
-    public $author = [];
-    public $strip = [];
-    public $single_page_link = [];
-    public $single_page_link_in_feed = [];
-    public $next_page_link = [];    
 
     public function __construct(string $rules) {
         $lines = preg_split('/\r\n?|\n/', $rules);
+        $findString = null;
+        $findStringLine = 0;
         foreach ($lines as $l => $d) {
             if (preg_match('/^#|^\s*$/', $d)) {
                 // the line contains no data
@@ -94,29 +91,45 @@ class SitePattern {
                 case "single_page_link":
                 case "single_page_link_in_feed":
                 case "next_page_link":
-                    $this->$directive[] = $value;
+                    $stage = ($directive === "strip") ? "cleanUp" : "readOut";
-                    // TODO: evaluate the XPathexpression to ensure syntactic validity 
+                    // TODO: evaluate the XPath expression to ensure syntactic validity 
+                    $this->$stage[] = [$directive, [$value]];
                     break;
                 case "strip_id_or_class":
                 case "strip_image_src":
                 case "find_string":
+                    // string values may be enclosed by single or double quotation marks as leading and trailing whitespace is otherwise stripped
                     if ((preg_match('/^"/', $value) && preg_match('/"$/', $value)) || (preg_match("/^'/", $value) && preg_match("/'$/", $value))) {
-                        $this->$directive[] = substr($value, 1, strlen($value) - 2);
+                        $value = substr($value, 1, strlen($value) - 2);
                     } else {
-                        $this->$directive[] = $value
+                        $value = $value;
                     }
+                    if ($directive === "find_string") {
+                        // the "find_string" directive must be matched to a later "replace_string" directive, so we keep one buffered
+                        // a find_string which is not cleared by a replace_string is an error
+                        if ($findString === null) {
+                            $findString = $value;
+                            $findStringLine = $l + 1;
+                        } else {
+                            throw new SitePatternException("\"find_string\" directive on line $findStringLine is not followed by a matching \"replace_string\" directive", 3);
+                        }
+                    } else {
+                        $this->cleanUp[] = [$directive, [$value]];
+                    }
+                    break;
                 case "replace_sring":
+                    # requires special handling to match up with find_string
                 case "http_header":
                     # string with param
                 case "tidy":
                 case "prune":
                 case "atodetect_on_failure":
                     if ($value === "yes") {
-                        $this->$directive = true;
+                        $value = true;
                     } elseif ($value === "no") {
-                        $this->$directive = false;
+                        $value = false;
                     } else {
-                        throw new SitePatternException("Invalid value for boolean on line ".($l + 1), 1);
+                        throw new SitePatternException("Invalid value for boolean on line ".($l + 1), 2);
                     }
                     break;
                 case "test_url":