cuberite-2a/source/Enchantments.cpp

// Enchantments.cpp

// Implements the cEnchantments class representing a storage for item enchantments and stored-enchantments

#include "Globals.h"
#include "Enchantments.h"
#include "WorldStorage/FastNBT.h"





cEnchantments::cEnchantments(void)
{
	// Nothing needed yet, but the constructor needs to be declared and impemented in order to be usable
}





cEnchantments::cEnchantments(const AString & a_StringSpec)
{
	AddFromString(a_StringSpec);
}





void cEnchantments::AddFromString(const AString & a_StringSpec)
{
	// Add enchantments in the stringspec; if a specified enchantment already exists, overwrites it
	
	// Split the StringSpec into separate declarations, each in the form "id=lvl":
	AStringVector Decls = StringSplit(a_StringSpec, ";");
	for (AStringVector::const_iterator itr = Decls.begin(), end = Decls.end(); itr != end; ++itr)
	{
		// Split each declaration into the id and lvl part:
		if (itr->empty())
		{
			// The decl is empty (may happen if there's an extra semicolon at the end), ignore silently
			continue;
		}
		AStringVector Split = StringSplitAndTrim(*itr, "=");
		if (Split.size() != 2)
		{
			// Malformed decl
			LOG("%s: Malformed enchantment decl: \"%s\", skipping.", __FUNCTION__, itr->c_str());
			continue;
		}
		int id = atoi(Split[0].c_str());
		int lvl = atoi(Split[1].c_str());
		if (
			((id  == 0) && (Split[0] != "0")) ||
			((lvl == 0) && (Split[1] != "0"))
		)
		{
			// Numbers failed to parse
			LOG("%s: Failed to parse enchantment declaration for numbers: \"%s\" and \"%s\", skipping.",
				__FUNCTION__, Split[0].c_str(), Split[1].c_str()
			);
			continue;
		}
		SetLevel(id, lvl);
	}  // for itr - Decls[]
}





AString cEnchantments::ToString(void) const
{
	// Serialize all the enchantments into a string
	AString res;
	for (cEnchantments::cMap::const_iterator itr = m_Enchantments.begin(), end = m_Enchantments.end(); itr != end; ++itr)
	{
		AppendPrintf(res, "%d=%d;", itr->first, itr->second);
	}  // for itr - m_Enchantments[]
	return res;
}





int cEnchantments::GetLevel(int a_EnchantmentID) const
{
	// Return the level for the specified enchantment; 0 if not stored
	cMap::const_iterator itr = m_Enchantments.find(a_EnchantmentID);
	if (itr != m_Enchantments.end())
	{
		return itr->second;
	}

	// Not stored, return zero
	return 0;
}





void cEnchantments::SetLevel(int a_EnchantmentID, int a_Level)
{
	// Sets the level for the specified enchantment, adding it if not stored before or removing it if level <= 0
	if (a_Level == 0)
	{
		// Delete enchantment, if present:
		cMap::iterator itr = m_Enchantments.find(a_EnchantmentID);
		if (itr != m_Enchantments.end())
		{
			m_Enchantments.erase(itr);
		}
	}
	else
	{
		// Add / overwrite enchantment
		m_Enchantments[a_EnchantmentID] = a_Level;
	}
}






void cEnchantments::Clear(void)
{
	m_Enchantments.clear();
}





bool cEnchantments::IsEmpty(void) const
{
	return m_Enchantments.empty();
}





void cEnchantments::WriteToNBTCompound(cFastNBTWriter & a_Writer, const AString & a_ListTagName) const
{
	// Write the enchantments into the specified NBT writer
	// begin with the LIST tag of the specified name ("ench" or "StoredEnchantments")
	
	a_Writer.BeginList(a_ListTagName, TAG_Compound);
	for (cMap::const_iterator itr = m_Enchantments.begin(), end = m_Enchantments.end(); itr != end; ++itr)
	{
		a_Writer.BeginCompound("");
			a_Writer.AddShort("id",  itr->first);
			a_Writer.AddShort("lvl", itr->second);
		a_Writer.EndCompound();
	}  // for itr - m_Enchantments[]
	a_Writer.EndList();
}





void cEnchantments::ParseFromNBT(cParsedNBT & a_NBT, int a_EnchListTagIdx)
{
	// Read the enchantments from the specified NBT list tag (ench or StoredEnchantments)

	// Verify that the tag is a list:
	if (a_NBT.GetType(a_EnchListTagIdx) != TAG_List)
	{
		LOGWARNING("%s: Invalid EnchListTag type: exp %d, got %d. Enchantments not parsed",
			__FUNCTION__, TAG_List, a_NBT.GetType(a_EnchListTagIdx)
		);
		ASSERT(!"Bad EnchListTag type");
		return;
	}
	
	// Verify that the list is of Compounds:
	if (a_NBT.GetChildrenType(a_EnchListTagIdx) != TAG_Compound)
	{
		LOGWARNING("%s: Invalid NBT list children type: exp %d, got %d. Enchantments not parsed",
			__FUNCTION__, TAG_Compound, a_NBT.GetChildrenType(a_EnchListTagIdx)
		);
		ASSERT(!"Bad EnchListTag children type");
		return;
	}
	
	Clear();
	
	// Iterate over all the compound children, parse an enchantment from each:
	for (int tag = a_NBT.GetFirstChild(a_EnchListTagIdx); tag >= 0; tag = a_NBT.GetNextSibling(tag))
	{
		// tag is the compound inside the "ench" list tag
		ASSERT(a_NBT.GetType(tag) == TAG_Compound);
		
		// Search for the id and lvl tags' values:
		int id = -1, lvl = -1;
		for (int ch = a_NBT.GetFirstChild(tag); ch >= 0; ch = a_NBT.GetNextSibling(ch))
		{
			if (a_NBT.GetType(ch) != TAG_Short)
			{
				continue;
			}
			if (a_NBT.GetName(ch) == "id")
			{
				id = a_NBT.GetShort(ch);
			}
			else if (a_NBT.GetName(ch) == "lvl")
			{
				lvl = a_NBT.GetShort(ch);
			}
		}  // for ch - children of the compound tag
		
		if ((id == -1) || (lvl <= 0))
		{
			// Failed to parse either the id or the lvl, skip this compound
			continue;
		}
		
		// Store the enchantment:
		m_Enchantments[id] = lvl;
	}  // for tag - children of the ench list tag
}