/// <summary>
/// next statement
/// </summary>
/// <param name="s"></param>
protected void doForEnd(Statement s)
{
if (m_forLoopStack.Count <= 0)
{
throw new ErrorCode(ErrorCode.ERROR_CODE_01);
}
ForRecord lr = m_forLoopStack.Peek();
if (s.m_symbol != null && s.m_symbol != lr.LOOP_VAR_NAME)
{
throw new ErrorCode(ErrorCode.ERROR_CODE_01);
}
if (lr.UpdateLoop())
{
m_forLoopStack.Pop();
}
else
{
// set the next index to the for begin line
m_index = lr.LOOP_BEGIN_INDEX;
while (m_statements[m_index].m_type != Statement.TYPE_FOR_BEGIN)
{
m_index++;
}
m_index++;
}
}
/// <summary>
/// for statement
/// </summary>
/// <param name="s"></param>
protected void doForBegin(Statement s)
{
string varName = s.m_symbol;
VarSymbol symbol = m_symbolTable.ResolveVar(varName);
ForRecord lr = null;
// use the top of LoopRecord or push a new one ?
if (m_forLoopStack.Count > 0)
{
lr = m_forLoopStack.Peek();
}
if (lr == null || lr.LOOP_VAR_NAME != varName)
{
lr = new ForRecord();
m_forLoopStack.Push(lr);
}
BaseData startValue = calculateExp(s.m_expressList[0]).m_value;
BaseData endValue = calculateExp(s.m_expressList[1]).m_value;
BaseData stepValue = calculateExp(s.m_expressList[2]).m_value;
// check the value type
if (startValue.TYPE != BaseData.TYPE_INT && startValue.TYPE != BaseData.TYPE_FLOAT)
{
throw new ErrorCode(ErrorCode.ERROR_CODE_02);
}
if (endValue.TYPE != BaseData.TYPE_INT && endValue.TYPE != BaseData.TYPE_FLOAT)
{
throw new ErrorCode(ErrorCode.ERROR_CODE_02);
}
if (stepValue.TYPE != BaseData.TYPE_INT && stepValue.TYPE != BaseData.TYPE_FLOAT)
{
throw new ErrorCode(ErrorCode.ERROR_CODE_02);
}
// initital the loop var
lr.SetLoopRecord(symbol, endValue, stepValue);
lr.SetBeginIndex(s.m_lineIndex);
// init the symbol value
symbol.VALUE = startValue;
}
/// <summary>
/// for statement
/// </summary>
/// <param name="s"></param>
protected void doForBegin( Statement s )
{
string varName = s.m_symbol;
VarSymbol symbol = m_symbolTable.ResolveVar(varName);
ForRecord lr = null;
// use the top of LoopRecord or push a new one ?
if( m_forLoopStack.Count > 0 )
lr = m_forLoopStack.Peek();
if( lr == null || lr.LOOP_VAR_NAME != varName )
{
lr = new ForRecord();
m_forLoopStack.Push(lr);
}
BaseData startValue = calculateExp(s.m_expressList[0]).m_value;
BaseData endValue = calculateExp(s.m_expressList[1]).m_value;
BaseData stepValue = calculateExp(s.m_expressList[2]).m_value;
// check the value type
if (startValue.TYPE != BaseData.TYPE_INT && startValue.TYPE != BaseData.TYPE_FLOAT)
throw new ErrorCode(ErrorCode.ERROR_CODE_02);
if (endValue.TYPE != BaseData.TYPE_INT && endValue.TYPE != BaseData.TYPE_FLOAT)
throw new ErrorCode(ErrorCode.ERROR_CODE_02);
if (stepValue.TYPE != BaseData.TYPE_INT && stepValue.TYPE != BaseData.TYPE_FLOAT)
throw new ErrorCode(ErrorCode.ERROR_CODE_02);
// initital the loop var
lr.SetLoopRecord(symbol, endValue, stepValue);
lr.SetBeginIndex(s.m_lineIndex);
// init the symbol value
symbol.VALUE = startValue;
}