Allow overriding tool capabilities through itemstack metadata

This makes it possible to modify the tool capabilities of individual
itemstacks by calling a method on itemstack metadata references.

1 files changed, 41 insertions, 0 deletions

diff --git a/src/itemstackmetadata.cpp b/src/itemstackmetadata.cpp
index f63671425..53c8bad83 100644
--- a/src/itemstackmetadata.cpp
+++ b/src/itemstackmetadata.cpp
@@ -9,6 +9,22 @@
 #define DESERIALIZE_KV_DELIM_STR "\x02"
 #define DESERIALIZE_PAIR_DELIM_STR "\x03"
 
+#define TOOLCAP_KEY "tool_capabilities"
+
+void ItemStackMetadata::clear()
+{
+	Metadata::clear();
+	updateToolCapabilities();
+}
+
+bool ItemStackMetadata::setString(const std::string &name, const std::string &var)
+{
+	bool result = Metadata::setString(name, var);
+	if (name == TOOLCAP_KEY)
+		updateToolCapabilities();
+	return result;
+}
+
 void ItemStackMetadata::serialize(std::ostream &os) const
 {
 	std::ostringstream os2;
@@ -41,4 +57,29 @@ void ItemStackMetadata::deSerialize(std::istream &is)
 			m_stringvars[""] = in;
 		}
 	}
+	updateToolCapabilities();
+}
+
+void ItemStackMetadata::updateToolCapabilities()
+{
+	if (contains(TOOLCAP_KEY)) {
+		toolcaps_overridden = true;
+		toolcaps_override = ToolCapabilities();
+		std::istringstream is(getString(TOOLCAP_KEY));
+		toolcaps_override.deserializeJson(is);
+	} else {
+		toolcaps_overridden = false;
+	}
+}
+
+void ItemStackMetadata::setToolCapabilities(const ToolCapabilities &caps)
+{
+	std::ostringstream os;
+	caps.serializeJson(os);
+	setString(TOOLCAP_KEY, os.str());
+}
+
+void ItemStackMetadata::clearToolCapabilities()
+{
+	setString(TOOLCAP_KEY, "");
 }