private string GenerateSequentialExpression(Expression expression)
{
SequentialExpression sequence = expression as SequentialExpression;
return(this.GenerateExpression(sequence.AtomicExpression) + " " +
this.GenerateExpression(sequence.NonAlternativesExpression));
}
private ParseAction ImportSequentialExpression(Expression exp,
Entity entity,
ParseAction parent = null,
bool optional = false)
{
SequentialExpression sequence = ((SequentialExpression)exp);
ConsumeAll consume = new ConsumeAll()
{
Parent = parent
};
// SequentialExpression is constructed recusively, unroll it...
while (true)
{
// add first part
consume.Actions.Add(this.ImportPropertiesAndParseActions(
sequence.AtomicExpression, entity, consume, optional
));
// add remaining parts
if (sequence.NonAlternativesExpression is AtomicExpression)
{
// last part
consume.Actions.Add(this.ImportPropertiesAndParseActions(
sequence.NonAlternativesExpression, entity, consume, optional
));
break;
}
else
{
// recurse
sequence = (SequentialExpression)sequence.NonAlternativesExpression;
}
}
return(consume);
}
/// <summary>
/// 根据给定的字符串，创建一个计算器结构。
/// </summary>
/// <param name="expression_string">要转化为计算器的字符串</param>
/// <returns>字符串对应的就计算器结构</returns>
public static CalculatorMachine GetCalculatorMachine(string expression_string)
{
return(SequentialExpression.FromString(expression_string).ToPreorderExpression().ToCalculateMachine());
}