private static ExternalConnection ParseExternalConnection(string line)
{
if (string.IsNullOrEmpty(line) || !line.EndsWith("*)"))
{
return(null);
}
string name = string.Empty;
string dataType = string.Empty;
ExternalConnection variable = null;
int nameStart;
int typeStart;
int typeEnd;
if (line.StartsWith(sInvalidGlobVarPrefix))
{
//非法
nameStart = sInvalidGlobVarPrefix.Length;
typeStart = line.IndexOf(':', nameStart) + 1;
if (typeStart <= nameStart)
{
return(null);
}
name = line.Substring(nameStart, typeStart - nameStart - 1);
typeEnd = line.IndexOf(';', typeStart);
if (typeEnd <= typeStart)
{
return(null);
}
dataType = line.Substring(typeStart, typeEnd - typeStart);
variable = new ExternalConnection(name, ViDataType.GetDataType(dataType));
variable.ValidState = false;
}
else
{
// 合法
nameStart = 0;
typeStart = line.IndexOf(':') + 1;
if (typeStart <= nameStart)
{
return(null);
}
name = line.Substring(nameStart, typeStart - nameStart - 1);
typeEnd = line.IndexOf(';', typeStart);
if (typeEnd <= typeStart)
{
return(null);
}
dataType = line.Substring(typeStart, typeEnd - typeStart);
variable = new ExternalConnection(name, ViDataType.GetDataType(dataType));
variable.ValidState = true;
}
return(variable);
}
/// <summary>
/// 将文本行描述的变量定义，解析为管脚类型对象。
/// </summary>
/// <param name="decl">管脚的文本行描述</param>
/// <param name="typeCreation">自动创建管脚数据类型的方式</param>
/// <param name="creator">ViConnType 的创建函数</param>
/// <returns>管脚类型对象，null 表示解析失败</returns>
public static ViConnType Parse(string decl, ViTypeCreation typeCreation, Func <string, ViDataType, ViConnType> creator)
{
string name = null, type = null, comment = null; string[] addiInfo = null;
if (!SeperateNameType(decl.Trim(), ref name, ref type, ref addiInfo, ref comment))
{
return(null);
}
ViDataType dataType = null;
if (!string.IsNullOrEmpty(type))
{
dataType = ViDataType.GetDataType(type, typeCreation);
if (dataType == null)
{
return(null);
}
}
ViConnType connType = creator(name, dataType);
if (connType == null)
{
return(null);
}
// 备注
connType.Comment = comment;
if (addiInfo != null)
{
// 特性
foreach (string info in addiInfo)
{
if (info.Equals("F_EDGE", StringComparison.OrdinalIgnoreCase))
{
connType.Attributes |= ViConnAttributes.F_EDGE;
}
else if (info.Equals("R_EDGE", StringComparison.OrdinalIgnoreCase))
{
connType.Attributes |= ViConnAttributes.R_EDGE;
}
}
// 缺省值
if (addiInfo.Count() >= 2 && addiInfo[addiInfo.Count() - 2] == ":=")
{
connType.DefaultValue = addiInfo[addiInfo.Count() - 1];
}
}
return(connType);
}
public bool DeserializeFrom(ViBlur blur, System.Xml.XmlReader reader)
{
string name = reader.GetAttribute(blur, "name");
string connectable = reader.GetAttribute("connectable");
string fast = reader.GetAttribute("fast");
string attributes = reader.GetAttribute("attributes");
string defaultValue = reader.GetAttribute("defaultValue");
string connected = reader.GetAttribute("connected");
//Name
if (!string.IsNullOrEmpty(name))
{
this.Name = name;
}
//Connectable
if (!string.IsNullOrEmpty(connectable))
{
this.Connectable = bool.Parse(connectable);
}
//Fast
if (!string.IsNullOrEmpty(fast))
{
this.Fast = bool.Parse(fast);
}
//Attributes
if (!string.IsNullOrEmpty(attributes))
{
if (string.Compare(attributes, ViConnAttributes.F_EDGE.ToString(), true) == 0)
{
this.Attributes = ViConnAttributes.F_EDGE;
}
else if (string.Compare(attributes, ViConnAttributes.R_EDGE.ToString(), true) == 0)
{
this.Attributes = ViConnAttributes.R_EDGE;
}
else
{
this.Attributes = ViConnAttributes.None;
}
}
if (!string.IsNullOrEmpty(defaultValue))
{
this.DefaultValue = defaultValue;
}
while (!reader.EOF)
{
if (!reader.Read())
{
break;
}
if (reader.NodeType == System.Xml.XmlNodeType.Whitespace)
{
continue;
}
if (reader.NodeType == System.Xml.XmlNodeType.Element)
{
if (string.Compare(reader.Name, "dataType", true) == 0)
{
string typeName = reader.GetAttribute("typeName");
//读取Value
if (!reader.IsEmptyElement && string.IsNullOrEmpty(typeName))
{
if (!reader.Read())
{
break;
}
typeName = reader.Value;
}
ViDataType dataType = ViDataType.GetDataType(typeName);
this.Type = dataType;
}
}
else if (reader.NodeType == System.Xml.XmlNodeType.EndElement)
{
if (string.Compare(reader.Name, ViConnType.TAG, true) == 0)
{
return(true);
}
}
}
return(false);
}
