/// <summary>
/// 移除对局部变量的引用
/// </summary>
/// <param name="varName">变量名</param>
/// <return>操作成功与否</return>
public bool UnsignalVar(string varName)
{
VariablePackage varItem = null;
if ((varItem = this.localVarList.Find((x) => x.varName == varName)) != null)
{
varItem.referenceCount--;
if (varItem.referenceCount == 0)
{
this.localVarList.Remove(varItem);
}
return(true);
}
return(false);
}
/// <summary>
/// 查找一个局部变量，如果不存在就增加它；并且增添它的被引用次数
/// </summary>
/// <param name="varName">变量名</param>
/// <param name="isLeftValue">是否作为左值</param>
/// <param name="line">出现的行</param>
/// <returns>在调用方法前该变量是否不存在</returns>
public bool SignalVar(string varName, bool isLeftValue, int line)
{
VariablePackage varItem = null;
if ((varItem = this.localVarList.Find((x) => x.varName == varName)) != null)
{
if (isLeftValue)
{
varItem.firstLeftValueLine = Math.Min(line, varItem.firstLeftValueLine);
}
varItem.referenceCount++;
return(false);
}
varItem = new VariablePackage()
{
varName = varName,
firstLeftValueLine = isLeftValue ? line : Int32.MaxValue,
isGlobal = false,
referenceCount = 1
};
this.localVarList.Add(varItem);
return(true);
}
/// <summary>
/// 查找一个局部变量，如果不存在就增加它；并且增添它的被引用次数
/// </summary>
/// <param name="varName">变量名</param>
/// <param name="isLeftValue">是否作为左值</param>
/// <param name="line">出现的行</param>
/// <returns>在调用方法前该变量是否不存在</returns>
public bool SignalVar(string varName, bool isLeftValue, int line)
{
VariablePackage varItem = null;
if ((varItem = this.localVarList.Find((x) => x.varName == varName)) != null)
{
if (isLeftValue)
{
varItem.firstLeftValueLine = Math.Min(line, varItem.firstLeftValueLine);
}
varItem.referenceCount++;
return false;
}
varItem = new VariablePackage()
{
varName = varName,
firstLeftValueLine = isLeftValue ? line : Int32.MaxValue,
isGlobal = false,
referenceCount = 1
};
this.localVarList.Add(varItem);
return true;
}