Schematics: Refactor NodeResolver and add NodeResolveMethod

NodeResolver name lists now belong to the NodeResolver object instead of
the associated NodeDefManager.  In addition to minimizing unnecessary
abstraction and overhead, this move permits NodeResolvers to look up nodes
that they had previously set pending for resolution.  So far, this
functionality has been used in the case of schematics for
serialization/deserialization.

src/mg_schematic.cpp

@@ -56,22 +56,16 @@ Schematic::~Schematic()
 }
 
 
-void Schematic::resolveNodeNames(NodeResolveInfo *nri)
+void Schematic::resolveNodeNames()
 {
-	m_ndef->getIdsFromResolveInfo(nri, c_nodes);
-}
-
-
-void Schematic::updateContentIds()
-{
-	if (flags & SCHEM_CIDS_UPDATED)
-		return;
-
-	flags |= SCHEM_CIDS_UPDATED;
+	getIdsFromNrBacklog(&c_nodes, true, CONTENT_AIR);
 
 	size_t bufsize = size.X * size.Y * size.Z;
-	for (size_t i = 0; i != bufsize; i++)
-		schemdata[i].setContent(c_nodes[schemdata[i].getContent()]);
+	for (size_t i = 0; i != bufsize; i++) {
+		content_t c_original = schemdata[i].getContent();
+		content_t c_new = c_nodes[c_original];
+		schemdata[i].setContent(c_new);
+	}
 }
 
 
@@ -82,8 +76,6 @@ void Schematic::blitToVManip(v3s16 p, MMVManip *vm, Rotation rot,
 	int ystride = size.X;
 	int zstride = size.X * size.Y;
 
-	updateContentIds();
-
 	s16 sx = size.X;
 	s16 sy = size.Y;
 	s16 sz = size.Z;
@@ -198,8 +190,7 @@ void Schematic::placeStructure(Map *map, v3s16 p, u32 flags, Rotation rot,
 }
 
 
-bool Schematic::deserializeFromMts(std::istream *is,
-	INodeDefManager *ndef, std::vector<std::string> *names)
+bool Schematic::deserializeFromMts(std::istream *is, std::vector<std::string> *names)
 {
 	std::istream &ss = *is;
 	content_t cignore = CONTENT_IGNORE;
@@ -263,7 +254,7 @@ bool Schematic::deserializeFromMts(std::istream *is,
 }
 
 
-bool Schematic::serializeToMts(std::ostream *os, INodeDefManager *ndef)
+bool Schematic::serializeToMts(std::ostream *os)
 {
 	std::ostream &ss = *os;
 
@@ -281,7 +272,7 @@ bool Schematic::serializeToMts(std::ostream *os, INodeDefManager *ndef)
 	u16 numids = usednodes.size();
 	writeU16(ss, numids); // name count
 	for (int i = 0; i != numids; i++)
-		ss << serializeString(ndef->get(usednodes[i]).name); // node names
+		ss << serializeString(getNodeName(usednodes[i])); // node names
 
 	// compressed bulk node data
 	MapNode::serializeBulk(ss, SER_FMT_VER_HIGHEST_WRITE,
@@ -291,8 +282,7 @@ bool Schematic::serializeToMts(std::ostream *os, INodeDefManager *ndef)
 }
 
 
-bool Schematic::serializeToLua(std::ostream *os,
-	INodeDefManager *ndef, bool use_comments)
+bool Schematic::serializeToLua(std::ostream *os, bool use_comments)
 {
 	std::ostream &ss = *os;
 
@@ -335,7 +325,7 @@ bool Schematic::serializeToLua(std::ostream *os,
 
 			for (u16 x = 0; x != size.X; x++, i++) {
 				ss << "\t\t{"
-					<< "name=\"" << ndef->get(schemdata[i]).name
+					<< "name=\"" << getNodeName(schemdata[i].getContent())
 					<< "\", param1=" << (u16)schemdata[i].param1
 					<< ", param2=" << (u16)schemdata[i].param2
 					<< "}," << std::endl;
@@ -351,8 +341,9 @@ bool Schematic::serializeToLua(std::ostream *os,
 }
 
 
-bool Schematic::loadSchematicFromFile(const char *filename,
-	INodeDefManager *ndef, StringMap *replace_names)
+bool Schematic::loadSchematicFromFile(const std::string &filename,
+	INodeDefManager *ndef, StringMap *replace_names,
+	NodeResolveMethod resolve_method)
 {
 	std::ifstream is(filename, std::ios_base::binary);
 	if (!is.good()) {
@@ -361,30 +352,31 @@ bool Schematic::loadSchematicFromFile(const char *filename,
 		return false;
 	}
 
-	std::vector<std::string> names;
-	if (!deserializeFromMts(&is, ndef, &names))
+	size_t origsize = m_nodenames.size();
+	if (!deserializeFromMts(&is, &m_nodenames))
 		return false;
 
-	NodeResolveInfo *nri = new NodeResolveInfo(this);
-	for (size_t i = 0; i != names.size(); i++) {
-		if (replace_names) {
-			StringMap::iterator it = replace_names->find(names[i]);
+	if (replace_names) {
+		for (size_t i = origsize; i != m_nodenames.size(); i++) {
+			std::string &name = m_nodenames[i];
+			StringMap::iterator it = replace_names->find(name);
 			if (it != replace_names->end())
-				names[i] = it->second;
+				name = it->second;
 		}
-		nri->nodenames.push_back(names[i]);
 	}
-	nri->nodelistinfo.push_back(NodeListInfo(names.size(), CONTENT_AIR));
-	ndef->pendNodeResolve(nri);
+
+	m_nnlistsizes.push_back(m_nodenames.size() - origsize);
+
+	ndef->pendNodeResolve(this, resolve_method);
 
 	return true;
 }
 
 
-bool Schematic::saveSchematicToFile(const char *filename, INodeDefManager *ndef)
+bool Schematic::saveSchematicToFile(const std::string &filename)
 {
 	std::ostringstream os(std::ios_base::binary);
-	serializeToMts(&os, ndef);
+	serializeToMts(&os);
 	return fs::safeWriteToFile(filename, os.str());
 }