From 6f2af8846c7a25a931333ebb3efbf02a42136ee7 Mon Sep 17 00:00:00 2001
From: "J. King" <jking@jkingweb.ca>
Date: Mon, 13 Dec 2021 22:53:58 -0500
Subject: [PATCH] Parse XPath parameters properly; assignsome values

---
 lib/SitePattern.php | 93 ++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 87 insertions(+), 6 deletions(-)

diff --git a/lib/SitePattern.php b/lib/SitePattern.php
index b5ae16b..013a43b 100644
--- a/lib/SitePattern.php
+++ b/lib/SitePattern.php
@@ -7,16 +7,84 @@ declare(strict_types=1);
 namespace MensBeam\FullText;
 
 class SitePattern {
+    public $title = [];
+    public $body = [];
+    public $date = [];
+    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/', $rules);
         foreach ($lines as $l => $d) {
             if (preg_match('/^#|^\s*$/', $d)) {
                 // the line contains no data
                 continue;
-            } elseif (!preg_match('/^([a-z_]+)(?:\(([a-zA-Z0-9\-_]+)\))?:\s*(.+)$/', $d, $m)) {
-                throw new SitePatternException("Malformed data on line ".($l + 1), 1);
             }
-            [, $directive, $param, $value] = $m;
+            $pos = 0;
+            $end = strlen($d);
+            // consume the directive
+            $len = strspn($d, "abcdefghijklmnopqrstuvwxyz_");
+            if (!$len) {
+                throw new SitePatternException("Malformed data on line ".($l + 1)." at position 1", 1);
+            }
+            $directive = substr($d, $pos, $len);
+            $pos += $len;
+            $c = @$d[$pos++];
+            if ($c === ":") {
+                // the rest of the line is the value
+                $param = "";
+                $value = substr($d, $pos);
+            } elseif ($c === "(") {
+                // directive has a parameter
+                // certain directives' parameters are XPath expressions, so we must be mindful of these and parse the value
+                $xpath = in_array($directive, ["move_into"]);
+                if (!$xpath) {
+                    $len = strcspn($d, ")", $pos);
+                    $param = substr($d, $pos, $len);
+                    $pos += $len; 
+                } else {
+                    $param = "";
+                    $depth = 0;
+                    while (true) {
+                        $len = strcspn($d, "()'\"", $pos);
+                        $param .= substr($d, $pos, $len);
+                        $pos += $len;
+                        $c = @$d[$pos++];
+                        if ($c === ")") {
+                            if (!$depth) {
+                                break;
+                            } else {
+                                $param .= $c;
+                                $depth--;
+                            }
+                        } elseif ($c === '"') {
+                            $len = strcspn($d, '"', $pos);
+                            $param .+ '"'.substr($d, $pos, $len + 1);
+                            $pos += $len + 1;
+                        } elseif ($c === "'") {
+                            $len = strcspn($d, "'", $pos);
+                            $param .= "'".substr($d, $pos, $len + 1);
+                            $pos += $len + 1;
+                        } elseif ($c === "(") {
+                            $param .= $c;
+                            $depth++;
+                        } else {
+                            throw new SitePatternException("Malformed data on line ".($l + 1)." at position $pos", 1);
+                        }
+                    }
+                }
+                // after the parameter should come a colon and the value
+                $c = @$d[$pos++];
+                if ($c !== ":") {
+                    throw new SitePatternException("Malformed data on line ".($l + 1)." at position $pos", 1);
+                }
+                $value = trim(substr($d, $pos));
+            } else {
+                throw new SitePatternException("Malformed data on line ".($l + 1)." at position $pos", 1);
+            }
             switch ($directive) {
                 case "title":
                 case "body":
@@ -26,18 +94,31 @@ class SitePattern {
                 case "single_page_link":
                 case "single_page_link_in_feed":
                 case "next_page_link":
-                    # XPath
+                    $this->$directive[] = $value;
+                    // TODO: evaluate the XPathexpression to ensure syntactic validity 
+                    break;
                 case "strip_id_or_class":
                 case "strip_image_src":
                 case "find_string":
-                    # string
+                    if ((preg_match('/^"/', $value) && preg_match('/"$/', $value)) || (preg_match("/^'/", $value) && preg_match("/'$/", $value))) {
+                        $this->$directive[] = substr($value, 1, strlen($value) - 2);
+                    } else {
+                        $this->$directive[] = $value
+                    }
                 case "replace_sring":
                 case "http_header":
                     # string with param
                 case "tidy":
                 case "prune":
                 case "atodetect_on_failure":
-                    # yes/no boolean
+                    if ($value === "yes") {
+                        $this->$directive = true;
+                    } elseif ($value === "no") {
+                        $this->$directive = false;
+                    } else {
+                        throw new SitePatternException("Invalid value for boolean on line ".($l + 1), 1);
+                    }
+                    break;
                 case "test_url":
                     # URL
                 default: