public void AddSubNode(List <string> words, MethodInfo method)
{
// We should never hit this case.
if (words.Count == 0)
{
throw new InvalidOperationException("Out of words building command node.");
}
// Check the root to see if a node for the first incoming word has already been added
DebuggerCommand subNode = FindSubNodeByName(words[0]);
if (subNode == null)
{
// No, it has not -- create one and add it now.
subNode = new DebuggerCommand(words[0], null, null, null);
this.SubCommands.Add(subNode);
if (words.Count == 1)
{
// This is the last stop -- set the method and be done with it now.
subNode.Methods.Add(method);
// early return.
return;
}
}
else
{
// The node already exists, we will be adding a subnode, hopefully.
if (words.Count == 1)
{
//
// If we're on the last word at this point then this is an overloaded command.
// Check that we don't have any other commands with this number of arguments.
//
int argCount = method.GetParameters().Length;
foreach (MethodInfo info in subNode.Methods)
{
if (info.GetParameters().Length == argCount)
{
throw new InvalidOperationException("Duplicate overload for debug command");
}
}
//
// We're ok. Add it to the method list.
//
subNode.Methods.Add(method);
// and return early.
return;
}
}
// We have more words to go.
words.RemoveAt(0);
subNode.AddSubNode(words, method);
}
/// <summary>
/// Builds the debugger command tree.
/// </summary>
private void BuildCommandTree()
{
// Build the flat list which will be built into the tree.
// I'm kinda overloading the use of DebuggerCommand here. Sue me.
_commandList = new List <DebuggerCommand>();
Type[] debugTypes =
{
typeof(PERQSystem),
typeof(PERQCpu),
typeof(Z80System),
typeof(IO.Z80_new.Z80System),
typeof(Debugger)
};
foreach (Type type in debugTypes)
{
foreach (MethodInfo info in type.GetMethods(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic))
{
object[] attribs = info.GetCustomAttributes(typeof(DebugFunction), true);
if (attribs.Length > 1)
{
throw new InvalidOperationException(String.Format("More than one DebugFunction attribute set on {0}", info.Name));
}
else if (attribs.Length == 1)
{
// We have a debugger attribute set on this method.
// This cast should always succeed given that we're filtering for this type above.
DebugFunction function = (DebugFunction)attribs[0];
DebuggerCommand newCommand = new DebuggerCommand(function.CommandName, function.Description, function.Usage, info);
_commandList.Add(newCommand);
}
}
}
// Now actually build the command tree from the above list!
_commandRoot = new DebuggerCommand("Root", null, null, null);
foreach (DebuggerCommand c in _commandList)
{
string[] commandWords = c.Name.Split(' ');
// This is kind of ugly, we know that at this point every command built above have only
// one method. When building the tree, overloaded commands may end up with more than one.
_commandRoot.AddSubNode(new List <string>(commandWords), c.Methods[0]);
}
}
public DebuggerCommand FindSubNodeByName(string name)
{
DebuggerCommand found = null;
foreach (DebuggerCommand sub in SubCommands)
{
if (sub.Name == name)
{
found = sub;
break;
}
}
return(found);
}
private List <MethodInfo> GetMethodsFromCommandString(string command, out string[] args)
{
args = null;
List <string> cmdArgs =
new List <string>(
command.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries));
DebuggerCommand current = _commandRoot;
int commandIndex = 0;
while (true)
{
// If this node has an executor, then we're done
// (We assume that the tree is correctly built and that only
// leaves have executors)
if (current.Methods.Count > 0)
{
break;
}
if (commandIndex > cmdArgs.Count - 1)
{
// Out of args!
return(null);
}
// Otherwise we continue down the tree.
current = current.FindSubNodeByName(cmdArgs[commandIndex]);
commandIndex++;
if (current == null)
{
// If the node was not found, then the command is invalid.
return(null);
}
}
// Now current should point to the command with the executor
// and commandIndex should point to the first argument to the command.
cmdArgs.RemoveRange(0, commandIndex);
args = cmdArgs.ToArray();
return(current.Methods);
}
private string FuzzyMatch(DebuggerCommand root, List <string> tokens, bool silent)
{
if (tokens.Count == 0)
{
if (!silent)
{
// If there are no tokens, just show the completion for the root.
PrintCompletions(root.SubCommands);
}
return(String.Empty);
}
DebuggerCommand match = null;
bool exactMatch = false;
// Search for exact matches. If we find one it's guaranteed to be unique
// so we can follow that node.
foreach (DebuggerCommand c in root.SubCommands)
{
if (c.Name.ToLower() == tokens[0].ToLower())
{
match = c;
exactMatch = true;
break;
}
}
if (match == null)
{
// No exact match. Try a substring match.
// If we have an unambiguous match then we can complete it automatically.
// If the match is ambiguous, display possible completions and return String.Empty.
List <DebuggerCommand> completions = new List <DebuggerCommand>();
foreach (DebuggerCommand c in root.SubCommands)
{
if (c.Name.StartsWith(tokens[0], StringComparison.InvariantCultureIgnoreCase))
{
completions.Add(c);
}
}
if (completions.Count == 1)
{
// Unambiguous match. Use it.
match = completions[0];
}
else if (completions.Count > 1)
{
// Ambiguous match. Display possible completions.
if (!silent)
{
PrintCompletions(completions);
}
}
}
if (match == null)
{
// If we reach this point then no matches are available. Return the tokens we have...
StringBuilder sb = new StringBuilder();
for (int i = 0; i < tokens.Count; i++)
{
if (i < tokens.Count - 1)
{
sb.AppendFormat("{0} ", tokens[i]);
}
else
{
sb.AppendFormat("{0}", tokens[i]);
}
}
return(sb.ToString());
}
else
{
// A match was found
tokens.RemoveAt(0);
string subMatch = String.Empty;
if (tokens.Count > 0)
{
subMatch = FuzzyMatch(match, tokens, silent);
}
else if (exactMatch)
{
if (!silent && match.SubCommands.Count > 0)
{
// Just show the completions for this node.
PrintCompletions(match.SubCommands);
}
}
if (subMatch == String.Empty)
{
return(String.Format("{0} ", match.Name));
}
else
{
return(String.Format("{0} {1}", match.Name, subMatch));
}
}
}
public DebuggerPrompt(DebuggerCommand root)
{
_commandTree = root;
_commandHistory = new List <string>(64);
_historyIndex = 0;
}
