private static bool DoInclude(ref StateContext context)
{
switch (context.Character)
{
case ',':
context.Include();
context.State = State.None;
break;
case ':':
context.Include();
context.State = State.PagingCount;
break;
case '(':
context.Include();
context.State = State.SortingField;
break;
case '{':
context.Include();
context.Push();
context.State = State.None;
break;
case '}':
context.Include();
context.Pop();
context.State = State.None;
break;
default:
if (context.IsLetterOrDigitOrUnderscore())
{
//判断标识中间是否含有空白字符
if (context.Flags.HasWhitespace())
{
context.OnError("SyntaxError: The identifier of the data schema contains whitespace characters.");
return(false);
}
context.Accept();
}
else if (!context.IsWhitespace())
{
context.OnError($"SyntaxError: The identifier of the data schema contains '{context.Character}' illegal character.");
return(false);
}
break;
}
//重置是否含有空格的标记
context.Flags.HasWhitespace(context.IsWhitespace());
return(true);
}
private static bool DoExclude(ref StateContext context)
{
switch (context.Character)
{
case ',':
context.Exclude();
context.State = State.None;
break;
case '}':
context.Exclude();
context.Pop();
context.State = State.None;
break;
default:
if (context.IsLetterOrDigitOrUnderscore())
{
//如果首字符是数字，则激发错误
if (char.IsDigit(context.Character) && !context.HasBuffer())
{
context.OnError("SyntaxError: The identifier of the data schema cannot start with a digit.");
return(false);
}
//判断标识中间是否含有空白字符
if (context.Flags.HasWhitespace())
{
context.OnError("SyntaxError: The identifier of the data schema contains whitespace characters.");
return(false);
}
context.Accept();
}
else if (!context.IsWhitespace())
{
context.OnError($"SyntaxError: The identifier of the data schema contains '{context.Character}' illegal character.");
return(false);
}
break;
}
//重置是否含有空格的标记
context.Flags.HasWhitespace(context.IsWhitespace());
return(true);
}
private static bool DoExclude(ref StateContext context)
{
switch (context.Character)
{
case ',':
context.Exclude();
context.State = State.None;
break;
case '}':
context.Exclude();
context.Pop();
context.State = State.None;
break;
default:
if (context.IsLetterOrDigitOrUnderscore())
{
//如果首字符是数字，则激发错误
if (char.IsDigit(context.Character) && !context.HasBuffer())
{
context.OnError("");
return(false);
}
//判断标识中间是否含有空白字符
if (context.Flags.HasWhitespace())
{
context.OnError("");
return(false);
}
context.Accept();
}
else if (!context.IsWhitespace())
{
context.OnError("");
return(false);
}
break;
}
//重置是否含有空格的标记
context.Flags.HasWhitespace(context.IsWhitespace());
return(true);
}
private static bool DoSortingField(ref StateContext context)
{
switch (context.Character)
{
case '~':
case '!':
if (context.HasBuffer())
{
context.OnError("SyntaxError: Expected sorting field in the data schema, but missing.");
return(false);
}
context.Accept();
return(true);
case ',':
if (context.AddSorting())
{
context.State = State.SortingGutter;
return(true);
}
return(false);
case ')':
if (context.AddSorting())
{
context.State = State.Include;
return(true);
}
return(false);
default:
if (context.IsLetterOrDigitOrUnderscore())
{
context.Accept();
return(true);
}
context.OnError($"SyntaxError: The sorting field of the data schema contains '{context.Character}' illegal character.");
return(false);
}
}
private static bool DoSortingField(ref StateContext context)
{
switch (context.Character)
{
case '~':
case '!':
if (context.HasBuffer())
{
context.OnError("");
return(false);
}
context.Accept();
return(true);
case ',':
if (context.AddSorting())
{
context.State = State.SortingGutter;
return(true);
}
return(false);
case ')':
if (context.AddSorting())
{
context.State = State.Include;
return(true);
}
return(false);
default:
if (context.IsLetterOrDigitOrUnderscore())
{
context.Accept();
return(true);
}
context.OnError("");
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);
}
