Method IsVarInScope

src/server/angelscript/angelscript/source/as_context.cpp:4676–4732

Interface

// Interface
bool asCContext::IsVarInScope(asUINT varIndex, asUINT stackLevel)
{
	// Don't return anything if there is no bytecode, e.g. before calling Execute()
	if( m_regs.programPointer == 0 ) return false;

	if( stackLevel >= GetCallstackSize() ) return false;

	asCScriptFunction *func;
	asUINT pos;

	if( stackLevel == 0 )
	{
		func = m_currentFunction;
		if( func->scriptData == 0 ) return false;
		pos = asUINT(m_regs.programPointer - func->scriptData->byteCode.AddressOf());
	}
	else
	{
		asPWORD *s = m_callStack.AddressOf() + (GetCallstackSize()-stackLevel-1)*CALLSTACK_FRAME_SIZE;
		func = (asCScriptFunction*)s[1];
		if( func->scriptData == 0 ) return false;
		pos = asUINT((asDWORD*)s[2] - func->scriptData->byteCode.AddressOf());
	}

	// First determine if the program position is after the variable declaration
	if( func->scriptData->variables.GetLength() <= varIndex ) return false;
	if( func->scriptData->variables[varIndex]->declaredAtProgramPos > pos ) return false;

	asUINT declaredAt = func->scriptData->variables[varIndex]->declaredAtProgramPos;

	// If the program position is after the variable declaration it is necessary
	// determine if the program position is still inside the statement block where
	// the variable was delcared.
	for( int n = 0; n < (int)func->scriptData->objVariableInfo.GetLength(); n++ )
	{
		if( func->scriptData->objVariableInfo[n].programPos >= declaredAt )
		{
			// If the current block ends between the declaredAt and current
			// program position, then we know the variable is no longer visible
			int level = 0;
			for( ; n < (int)func->scriptData->objVariableInfo.GetLength(); n++ )
			{
				if( func->scriptData->objVariableInfo[n].programPos > pos )
					break;

				if( func->scriptData->objVariableInfo[n].option == asBLOCK_BEGIN ) level++;
				if( func->scriptData->objVariableInfo[n].option == asBLOCK_END && --level < 0 )
					return false;
			}

			break;
		}
	}

	// Variable is visible
	return true;
}