From d80f260b8bb56032b24a3d85a0b7822ce1135e4a Mon Sep 17 00:00:00 2001
From: Tom Hughes <tom@compton.nu>
Date: Thu, 29 Apr 2010 00:29:49 +0100
Subject: [PATCH] Implement OSM.spam_score to return a spam score for a piece
 of text

---
 lib/osm.rb | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/lib/osm.rb b/lib/osm.rb
index cb23b0c97..46b904477 100644
--- a/lib/osm.rb
+++ b/lib/osm.rb
@@ -7,6 +7,7 @@ module OSM
   require 'xml/libxml'
   require 'digest/md5'
   require 'RMagick'
+  require 'nokogiri'
 
   # The base class for API Errors.
   class APIError < RuntimeError
@@ -498,5 +499,24 @@ module OSM
     return "#{tilesql} AND #{prefix}latitude BETWEEN #{minlat} AND #{maxlat} AND #{prefix}longitude BETWEEN #{minlon} AND #{maxlon}"
   end
 
+  # Return a spam score for a chunk of text
+  def self.spam_score(text)
+    link_count = 0
+    link_size = 0
 
+    doc = Nokogiri::HTML(text)
+
+    if doc.content.length > 0
+      doc.xpath("//a").each do |link|
+        link_count += 1
+        link_size += link.content.length
+      end
+
+      link_proportion = link_size.to_f / doc.content.length.to_f
+    else
+      link_proportion = 0
+    end
+
+    return [link_proportion - 0.2, 0.0].max * 200 + link_count * 20
+  end
 end
-- 
2.43.2