internal void AddPropertyAfter(ObjectProperty property, ConFileEntry afterItem)
{
// Make sure this entry doesnt already exist
if (Entries.IndexOf(property) > 0)
{
throw new Exception("The specified ObjectProperty already exists in this confile.");
}
// Find the owner object
int index = Entries.IndexOf(afterItem) + 1;
if (index == 0)
{
throw new Exception("The specified \"afterObject\" does not exist in this ConFile");
}
// Insert item
if (index == Entries.Count)
{
Entries.Add(property);
}
else
{
Entries.Insert(index, property);
}
}
/// <summary>
/// Gets the Reference of an Expression, that occurs before the specified
/// entry.
/// </summary>
/// <param name="name">The name of the variable or constant expression</param>
/// <param name="beforeEntry">
/// The entry where this variable or constant expression is referenced
/// </param>
/// <returns>
/// Returns the last reference value of the specifed expression, occuring
/// before the <paramref name="beforeEntry"/>
/// </returns>
public Expression GetExpressionReference(string name, ConFileEntry beforeEntry)
{
// Check to see if this expression exists
if (!Expressions.ContainsKey(name))
{
goto Undefined;
}
// Grab the last reference before this confile entry
int index = Entries.IndexOf(beforeEntry);
if (index == -1)
{
throw new Exception("The specified entry does not exist in this ConFile");
}
// Now find the last set expression reference value
for (int i = index - 1; i >= 0; i--)
{
ConFileEntry entry = Entries[i];
TokenType kind = entry.Token.Kind;
if (kind == TokenType.Constant || kind == TokenType.Variable)
{
// cast to Expression
Expression exp = entry as Expression;
if (exp.Name == name)
{
// This expression hasnt been assigned yet.. shame
/***
* We have no way yet to determine if a variable is assigned
* inside an If/While statement, so skip for now
*
* if (String.IsNullOrWhiteSpace(exp.Value))
* throw new Exception($"Value cannot be null; Expression \"{name}\" is unassigned");
*/
return(exp);
}
}
}
// If we are here, the expression was not defined yet
Undefined:
{
string err;
if (name.StartsWith("c"))
{
err = $"Undefined constant \"{name}\"";
}
else
{
err = $"Undefined variable \"{name}\"";
}
throw new Exception(err);
}
}
/// <summary>
/// Adds a new object to this confile, and returns it's reference
/// </summary>
/// <param name="entry"></param>
/// <param name="token"></param>
/// <returns></returns>
public void AddEntry(ConFileEntry entry, Token token)
{
if (token.Kind == TokenType.RemComment)
{
return;
}
else if (token.Kind == TokenType.ObjectStart)
{
Objects.Add((ConFileObject)entry);
}
else if (token.Kind == TokenType.ActiveSwitch)
{
// Create a new reference and add it
var reference = new ObjectReference()
{
Token = token,
Object = (ConFileObject)entry
};
References.Add(reference);
// Set entry to the object reference
entry = reference;
}
else if (entry is Expression)
{
Expression exp = entry as Expression;
if (!Expressions.ContainsKey(exp.Name))
{
// Add the expression
Expressions.Add(exp.Name, new List <Expression>()
{
exp
});
}
}
// Always add the entry
Entries.Add(entry);
}
