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);
}
protected override bool OnVariableLine(string line)
{
int i = line.IndexOf("Next Index:");
if (i >= 0)
{
i = line.IndexOf("(", i);
int j = line.IndexOf(")", i);
string index = line.Substring(i + 1, j - i - 1);
if (j > i)
{
try
{
this.NextVariableID = int.Parse(index);
}
catch (System.Exception ee)
{
Trace.WriteLine("### [" + ee.Source + "] Exception: " + ee.Message);
Trace.WriteLine("### " + ee.StackTrace);
}
}
}
else
{
ExternalConnection connType = ExternalConnection.Parse(line, ViTypeCreation.Create);
if (connType == null || connType.Type == null)
{
return(false);
}
this.AddChild(connType);
}
return(true);
}
/// <summary>
/// 将文本行描述的变量定义，解析为变量对象。
/// </summary>
/// <param name="line">变量的文本行描述</param>
/// <param name="typeCreation">自动创建变量数据类型的方式</param>
/// <returns>变量对象，null 表示解析失败</returns>
public static new ExternalConnection Parse(string line, ViTypeCreation typeCreation)
{
ExternalConnection variable = ParseExternalConnection(line);
if (variable == null)
{
return(null);
}
int targetPathStart = line.IndexOf(sTargetPathIdentifier);
int sourcePathStart = line.IndexOf(sSourcePathIdentifier);
int targetTaskStart = line.IndexOf(sTargetTaskTypeIdentifier);
int sourceTaskStart = line.IndexOf(sSourceTaskTypeIdentifier);
int targetBlockModeStart = line.IndexOf(sTargetBlockModeIdentifier);
int sourceBlockModeStart = line.IndexOf(sSourceBlockModeIdentifier);
int uuidStart = line.IndexOf(sUuidIdentifier);
int endIndex = line.IndexOf("*)");
//targetPath
if (sourcePathStart > targetPathStart + sTargetPathIdentifier.Length)
{
variable.TargetPath = line.Substring(targetPathStart + sTargetPathIdentifier.Length, sourcePathStart - targetPathStart - sTargetPathIdentifier.Length).Trim();
}
//sourcePath
if (targetTaskStart > sourcePathStart + sSourcePathIdentifier.Length)
{
variable.SourcePath = line.Substring(sourcePathStart + sSourcePathIdentifier.Length, targetTaskStart - sourcePathStart - sSourcePathIdentifier.Length).Trim();
}
//targetTask
if (sourceTaskStart > targetTaskStart + sTargetTaskTypeIdentifier.Length)
{
variable.TargetTaskType = line.Substring(targetTaskStart + sTargetTaskTypeIdentifier.Length, sourceTaskStart - targetTaskStart - sTargetTaskTypeIdentifier.Length).Trim();
}
//sourceTask
if (targetBlockModeStart > sourceTaskStart + sSourceTaskTypeIdentifier.Length)
{
variable.SourceTaskType = line.Substring(sourceTaskStart + sSourceTaskTypeIdentifier.Length, targetBlockModeStart - sourceTaskStart - sSourceTaskTypeIdentifier.Length).Trim();
}
//targetBlockMode
if (sourceBlockModeStart > targetBlockModeStart + sTargetBlockModeIdentifier.Length)
{
variable.TargetBlockModes = line.Substring(targetBlockModeStart + sTargetBlockModeIdentifier.Length, sourceBlockModeStart - targetBlockModeStart - sTargetBlockModeIdentifier.Length).Trim();
}
//sourceBlockMode
if (uuidStart > sourceBlockModeStart + sSourceBlockModeIdentifier.Length)
{
variable.SourceBlockModes = line.Substring(sourceBlockModeStart + sSourceBlockModeIdentifier.Length, uuidStart - sourceBlockModeStart - sSourceBlockModeIdentifier.Length).Trim();
}
//UUID
if (endIndex > uuidStart + sUuidIdentifier.Length)
{
variable.UUID = line.Substring(uuidStart + sUuidIdentifier.Length, endIndex - uuidStart - sUuidIdentifier.Length).Trim();
}
return(variable);
}
/// <summary>
/// 创建一个变量。变量名称和UUID会自动生成。
/// </summary>
/// <param name="dataType">变量类型</param>
/// <returns>创建的变量。</returns>
/// @infor 创建的变量已经被加入到 Children 数组中。
public ExternalConnection CreateVariable(ViDataType dataType)
{
// 生成变量名称
string name = this.NextVariableName();
ExternalConnection variable = new ExternalConnection(name, dataType);
// 生成变量 UUID
variable.UUID = ViGuid.NewGuid();
// 将变量加入 Children 数组
this.AddChild(variable);
// 大功告成
return(variable);
}
/// <summary>
/// 对给定管脚路径中的 Program 部分进行重命名操作。
/// </summary>
private string RenameProgramInPath(string oldName, string newName, string path)
{
if (string.IsNullOrEmpty(oldName) || string.IsNullOrEmpty(newName) || string.IsNullOrEmpty(path))
{
return(path);
}
if (ExternalConnection.RetrievePlanName(path) != oldName)
{
return(path);
}
int firstPathSeparator = path.IndexOf(ViNamedObject.PathSeperator);
int secondPathSeparator = path.IndexOf(ViNamedObject.PathSeperator, firstPathSeparator + 1);
string programName = path.Substring(firstPathSeparator + 1, secondPathSeparator - firstPathSeparator - 1);
programName = programName.Replace(oldName, newName);
return(string.Format("{0}{1}{2}", path.Substring(0, firstPathSeparator + 1), programName, path.Substring(secondPathSeparator)));
}
