private static bool DoGutter(ref StateContext context, int position)
{
switch (context.Character)
{
case '.':
context.State = State.Separator;
return(true);
case '[':
context.State = State.Indexer;
//追加索引器表达式，并将索引器加入到递归栈中
context.AppendIndexer();
return(true);
default:
if (context.IsWhitespace())
{
return(true);
}
context.OnError(GetIllegalCharacterExceptionMessage(context.Character, position));
return(false);
}
}
private static bool DoMethod(ref StateContext context, int position)
{
if (context.IsWhitespace())
{
return(true);
}
if (context.Character == '\'' || context.Character == '\"')
{
context.State = State.String;
context.Flags.SetConstantType(TypeCode.String);
context.Flags.SetStringQuote(context.Character);
return(true);
}
if (context.Character >= '0' && context.Character <= '9')
{
context.State = State.Number;
context.Flags.SetConstantType(TypeCode.Int32);
context.Accept();
return(true);
}
if (context.IsLetterOrUnderscore())
{
context.State = State.Identifier;
context.Accept();
return(true);
}
if (context.Character == '[')
{
context.AppendIndexer();
return(true);
}
if (context.Character == ')')
{
context.Stack.Pop();
context.ResetState();
return(true);
}
context.OnError(GetIllegalCharacterExceptionMessage(context.Character, position));
return(false);
}
private static bool DoIdentifier(ref StateContext context, int position)
{
switch (context.Character)
{
case '.':
context.State = State.Separator;
context.AppendIdentifier(context.Peek());
context.Flags.IsAttaching(true);
break;
case '[':
context.State = State.Indexer;
context.AppendIdentifier(context.Peek());
context.AppendIndexer();
context.Flags.IsAttaching(false);
break;
case '(':
context.State = State.Method;
context.AppendMethod();
context.Flags.IsAttaching(false);
break;
case ',':
var ownerState = context.GetOwnerState();
if (ownerState == State.Indexer || ownerState == State.Method)
{
context.State = ownerState;
}
else
{
context.OnError(GetIllegalCharacterExceptionMessage(context.Character, position));
return(false);
}
context.AppendIdentifier(context.Peek());
context.Flags.IsAttaching(false);
break;
case ']':
if (context.GetOwnerState() != State.Indexer)
{
context.OnError(GetIllegalCharacterExceptionMessage(context.Character, position));
return(false);
}
context.AppendIdentifier(context.Stack.Pop());
context.Flags.IsAttaching(false);
//重置状态
context.ResetState();
break;
case ')':
if (context.GetOwnerState() != State.Method)
{
context.OnError(GetIllegalCharacterExceptionMessage(context.Character, position));
return(false);
}
context.AppendIdentifier(context.Stack.Pop());
context.Flags.IsAttaching(false);
//重置状态
context.ResetState();
break;
default:
if (context.IsLetterOrDigitOrUnderscore())
{
//判断标识表达式中间是否含有空白字符
if (context.Flags.HasWhitespace())
{
context.OnError(string.Format(EXCEPTION_IDENTIFIER_WHITESPACE_MESSAGE, position));
return(false);
}
context.Accept();
}
else if (!context.IsWhitespace())
{
context.OnError(GetIllegalCharacterExceptionMessage(context.Character, position));
return(false);
}
break;
}
//重置是否含有空格的标记
context.Flags.HasWhitespace(context.IsWhitespace());
return(true);
}
