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); }