/// <summary>
/// This method helps recursivly retrieve propeties.
/// </summary>
/// <param name="o"></param>
/// <param name="name"></param>
/// <returns></returns>
private ObjectItem Get_Value(object o, string name)
{
var parseError = "Parser error: the command line can't be evaluated!";
var result = new ObjectItem(null, null);
if (string.IsNullOrEmpty(name))
{
return(result);
}
var index = name.IndexOf('.');
index = (index > 0) ? index : name.Length;
var left = name.Substring(0, index);
result = GetProperty(o, left);
if (!string.IsNullOrEmpty(result.Error))
{
result.Error = parseError;
}
if (left != name)
{
if (result.Value == null)
{
result.Error = parseError;
}
else
{
result = Get_Value(result.Value, name.Substring(index + 1));
}
}
return(result);
}
/// <summary>
/// Recursively parse the command line content
/// </summary>
/// <param name="commandLine"></param>
private void DoParse(string commandLine)
{
string strLeft;
string strRight;
object left;
var str = commandLine.Replace(" ", " ");
str = str.Trim();
//Asignment
if (str.Contains("="))
{
var strs = str.Split('=');
if (strs.Length != 2 || strs[0].Length == 0 || str[1] == 0)
{
Result.Error = "syntax error: Don't know how to do Assignment!";
return;
}
strLeft = strRight = string.Empty;
strLeft = strs[0];
strRight = strs[1];
strLeft = strLeft.Trim();
strRight = strRight.Trim();
Result = new CommandLine(strRight, _table).Result;
//Set a value to a variable in the Table.
if (_table.Contains(strLeft))
{
_table.Remove(strLeft);
_table.Add(strLeft, Result.Value);
}
//Assign a value to a property.
else if (strLeft.Contains("."))
{
left =
new CommandLine(strLeft.Substring(0, strLeft.LastIndexOf(".", StringComparison.Ordinal)), _table)
.Result.Value;
if (left != null)
{
ReflectionUtils.SetProperty(left,
strLeft.Substring(strLeft.LastIndexOf(".", StringComparison.Ordinal) + 1),
Result.Value);
}
else
{
Result.Error = "Failed: can't set value to " + strLeft + "!";
}
}
//Make a declaration
else
{
_table.Add(strLeft, Result.Value);
}
}
//Invoke a method, Creating a object.
else if (str.EndsWith(")"))
{
if (str.StartsWith("new "))
{
str = str.Substring(4).Trim();
}
left = null;
strRight = strLeft = str.Substring(0, str.IndexOf("(", StringComparison.Ordinal));
//If there is a dot, invoke a method from an object
if (strLeft.LastIndexOf(".", StringComparison.Ordinal) >= 0)
{
strLeft = strLeft.Substring(0, strLeft.LastIndexOf(".", StringComparison.Ordinal));
left = new CommandLine(strLeft, _table).Result.Value;
}
//When left is null, invoke a constructor, otherwise invoke a method.
if (left != null)
{
//Get the command line start from the method name
//this will get the argument list.
str = str.Substring(strRight.LastIndexOf(".", StringComparison.Ordinal) + 1);
}
Result.Value = InvokMethod(str, left);
}
//Retrive data
else
{
if (_table.Contains(str))
{
Result.Value = _table[str];
return;
}
left = null;
strRight = str;
if (str.Contains("."))
{
strLeft = str.Substring(0, str.IndexOf(".", StringComparison.Ordinal));
left = _table[strLeft];
//If an object is found in a Table, the property name is needed in order to retrieve the value.
if (left != null && str.Length - (strLeft.Length + 1) > 0)
{
strRight = str.Substring(str.IndexOf(".", StringComparison.Ordinal) + 1,
str.Length - (strLeft.Length + 1));
}
}
Result = Get_Value(left, strRight);
if (!string.IsNullOrEmpty(Result.Error))
{
//If the expression is just for a static member of a class
Result = GetProperty(null, strRight);
}
}
}
/// <summary>
/// constructor
/// </summary>
/// <param name="commandLine"></param>
/// <param name="table"></param>
public CommandLine(string commandLine, Hashtable table)
{
_table = table;
Result = new ObjectItem(null, null);
DoParse(commandLine);
}
/// <summary>
/// Recursively parse the command line content
/// </summary>
/// <param name="commandLine"></param>
private void DoParse(string commandLine)
{
string strLeft;
string strRight;
object left;
var str = commandLine.Replace(" ", " ");
str = str.Trim();
//Asignment
if (str.Contains("="))
{
var strs = str.Split('=');
if (strs.Length != 2 || strs[0].Length == 0 || str[1] == 0)
{
Result.Error = "syntax error: Don't know how to do Assignment!";
return;
}
strLeft = strRight = string.Empty;
strLeft = strs[0];
strRight = strs[1];
strLeft = strLeft.Trim();
strRight = strRight.Trim();
Result = new CommandLine(strRight, _table).Result;
//Set a value to a variable in the Table.
if (_table.Contains(strLeft))
{
_table.Remove(strLeft);
_table.Add(strLeft, Result.Value);
}
//Assign a value to a property.
else if (strLeft.Contains("."))
{
left =
new CommandLine(strLeft.Substring(0, strLeft.LastIndexOf(".", StringComparison.Ordinal)), _table)
.Result.Value;
if (left != null)
{
ReflectionUtils.SetProperty(left,
strLeft.Substring(strLeft.LastIndexOf(".", StringComparison.Ordinal) + 1),
Result.Value);
}
else
{
Result.Error = "Failed: can't set value to " + strLeft + "!";
}
}
//Make a declaration
else
{
_table.Add(strLeft, Result.Value);
}
}
//Invoke a method, Creating a object.
else if (str.EndsWith(")"))
{
if (str.StartsWith("new "))
{
str = str.Substring(4).Trim();
}
left = null;
strRight = strLeft = str.Substring(0, str.IndexOf("(", StringComparison.Ordinal));
//If there is a dot, invoke a method from an object
if (strLeft.LastIndexOf(".", StringComparison.Ordinal) >= 0)
{
strLeft = strLeft.Substring(0, strLeft.LastIndexOf(".", StringComparison.Ordinal));
left = new CommandLine(strLeft, _table).Result.Value;
}
//When left is null, invoke a constructor, otherwise invoke a method.
if (left != null)
{
//Get the command line start from the method name
//this will get the argument list.
str = str.Substring(strRight.LastIndexOf(".", StringComparison.Ordinal) + 1);
}
Result.Value = InvokMethod(str, left);
}
//Retrive data
else
{
if (_table.Contains(str))
{
Result.Value = _table[str];
return;
}
left = null;
strRight = str;
if (str.Contains("."))
{
strLeft = str.Substring(0, str.IndexOf(".", StringComparison.Ordinal));
left = _table[strLeft];
//If an object is found in a Table, the property name is needed in order to retrieve the value.
if (left != null && str.Length - (strLeft.Length + 1) > 0)
{
strRight = str.Substring(str.IndexOf(".", StringComparison.Ordinal) + 1,
str.Length - (strLeft.Length + 1));
}
}
Result = Get_Value(left, strRight);
if (!string.IsNullOrEmpty(Result.Error))
{
//If the expression is just for a static member of a class
Result = GetProperty(null, strRight);
}
}
}
/// <summary>
/// This method helps recursivly retrieve propeties.
/// </summary>
/// <param name="o"></param>
/// <param name="name"></param>
/// <returns></returns>
private ObjectItem Get_Value(object o, string name)
{
var parseError = "Parser error: the command line can't be evaluated!";
var result = new ObjectItem(null, null);
if (string.IsNullOrEmpty(name))
{
return result;
}
var index = name.IndexOf('.');
index = (index > 0) ? index : name.Length;
var left = name.Substring(0, index);
result = GetProperty(o, left);
if (!string.IsNullOrEmpty(result.Error))
{
result.Error = parseError;
}
if (left != name)
{
if (result.Value == null)
{
result.Error = parseError;
}
else
{
result = Get_Value(result.Value, name.Substring(index + 1));
}
}
return result;
}
/// <summary>
/// constructor
/// </summary>
/// <param name="commandLine"></param>
/// <param name="table"></param>
public CommandLine(string commandLine, Hashtable table)
{
_table = table;
Result = new ObjectItem(null, null);
DoParse(commandLine);
}
