/// <summary>
/// Transpiles the IsAreaClear method to modify the check for attachment points.
/// </summary>
/// <param name="name">The method patched.</param>
/// <param name="method">The original method body.</param>
/// <returns>The new transpiled method body.</returns>
internal static IEnumerable <CodeInstruction> TranspileAreaClear(string name,
IEnumerable <CodeInstruction> method)
{
var instructions = new List <CodeInstruction>(method);
var powerMethod = typeof(BuildingDef).GetMethodSafe(
"ArePowerPortsInValidPositions", false, PPatchTools.AnyArguments);
var targetMethod = typeof(BuildStraightUpPatches).GetMethodSafe(
nameof(CheckVirtualAttachments), true, typeof(bool), typeof(BuildingDef),
typeof(int));
bool hasAnchor = false;
// Find call to power port check
if (powerMethod == null)
{
PUtil.LogWarning("Could not transpile {0} - no method found!".F(name));
}
else
{
// Go back for branch instruction
for (int i = instructions.Count - 1; i > 0; i--)
{
var instr = instructions[i];
var code = instr.opcode;
if ((code == OpCodes.Call || code == OpCodes.Callvirt) && powerMethod ==
(instr.operand as MethodInfo))
{
hasAnchor = true;
#if DEBUG
PUtil.LogDebug("Power method offset: {0:D}".F(i));
#endif
}
else if (hasAnchor && code.IsConditionalBranchInstruction())
{
#if DEBUG
PUtil.LogDebug("Branch offset: {0:D}".F(i));
#endif
var store = PPatchTools.GetMatchingStoreInstruction(
instructions[i - 1]);
// Stack has "flag" on it, pass it to our method
instructions.InsertRange(i, new List <CodeInstruction>(5)
{
// this
new CodeInstruction(OpCodes.Ldarg_0),
// cell
new CodeInstruction(OpCodes.Ldarg_2),
// Call
new CodeInstruction(OpCodes.Call, targetMethod),
// Duplicate
new CodeInstruction(OpCodes.Dup),
// Store
store
});
// Stack now has altered flag value
PUtil.LogDebug("Patched " + name);
break;
}
}
if (!hasAnchor)
{
PUtil.LogWarning("Could not transpile {0} - no anchor found!".F(name));
}
}
return(instructions);
}