Restored support for setting monster ID offset on monsters tag

Apparently this was supported before, but support for that was lost in
bd1fdd87eed48ba3ffcc413936d6a6a60a429a97.

Fixes #46

2 files changed, 12 insertions, 2 deletions

diff --git a/src/utils/xml.cpp b/src/utils/xml.cpp
index d0f51230..2fb9d66b 100644
--- a/src/utils/xml.cpp
+++ b/src/utils/xml.cpp
@@ -92,6 +92,11 @@ namespace XML
         return mDoc ? xmlDocGetRootElement(mDoc) : nullptr;
     }
 
+    bool hasProperty(xmlNodePtr node, const char *name)
+    {
+        return xmlHasProp(node, BAD_CAST name) != nullptr;
+    }
+
     int getProperty(xmlNodePtr node, const char* name, int def)
     {
         int &ret = def;
diff --git a/src/utils/xml.h b/src/utils/xml.h
index 60355aa6..df8dd1bd 100644
--- a/src/utils/xml.h
+++ b/src/utils/xml.h
@@ -60,9 +60,9 @@ namespace XML
     };
 
     /**
-     * Gets an floating point property from an xmlNodePtr.
+     * Returns whether a certain property is present.
      */
-    double getFloatProperty(xmlNodePtr node, const char *name, double def);
+    bool hasProperty(xmlNodePtr node, const char *name);
 
     /**
      * Gets an integer property from an xmlNodePtr.
@@ -70,6 +70,11 @@ namespace XML
     int getProperty(xmlNodePtr node, const char *name, int def);
 
     /**
+     * Gets an floating point property from an xmlNodePtr.
+     */
+    double getFloatProperty(xmlNodePtr node, const char *name, double def);
+
+    /**
      * Gets a string property from an xmlNodePtr.
      */
     std::string getProperty(xmlNodePtr node, const char *name,