/*
*----------------------------------------------------------------------
*
* DeleteImportedCmd -> deleteImportedCmd
*
* Invoked by Tcl whenever an imported command is deleted. The "real"
* command keeps a list of all the imported commands that refer to it,
* so those imported commands can be deleted when the real command is
* deleted. This procedure removes the imported command reference from
* the real command's list, and frees up the memory associated with
* the imported command.
*
* Results:
* None.
*
* Side effects:
* Removes the imported command from the real command's import list.
*
*----------------------------------------------------------------------
*/
internal static void deleteImportedCmd(ImportedCmdData data)
// The data object for this imported command
{
WrappedCommand realCmd = data.realCmd;
WrappedCommand self = data.self;
ImportRef ref_Renamed, prev;
prev = null;
for (ref_Renamed = realCmd.importRef; ref_Renamed != null; ref_Renamed = ref_Renamed.next)
{
if (ref_Renamed.importedCmd == self)
{
// Remove ref from real command's list of imported commands
// that refer to it.
if (prev == null)
{
// ref is first in list
realCmd.importRef = ref_Renamed.next;
}
else
{
prev.next = ref_Renamed.next;
}
ref_Renamed = null;
data = null;
return ;
}
prev = ref_Renamed;
}
throw new TclRuntimeError("DeleteImportedCmd: did not find cmd in real cmd's list of import references");
}
/*
*----------------------------------------------------------------------
*
* Tcl_Import -> importList
*
* Imports all of the commands matching a pattern into the namespace
* specified by namespace (or the current namespace if namespace
* is null). This is done by creating a new command (the "imported
* command") that points to the real command in its original namespace.
*
* If matching commands are on the autoload path but haven't been
* loaded yet, this command forces them to be loaded, then creates
* the links to them.
*
* Results:
* Returns if successful, raises TclException if something goes wrong.
*
* Side effects:
* Creates new commands in the importing namespace. These indirect
* calls back to the real command and are deleted if the real commands
* are deleted.
*
*----------------------------------------------------------------------
*/
internal static void importList(Interp interp, Namespace namespace_Renamed, string pattern, bool allowOverwrite)
{
Namespace ns, importNs;
Namespace currNs = getCurrentNamespace(interp);
string simplePattern, cmdName;
IEnumerator search;
WrappedCommand cmd, realCmd;
ImportRef ref_Renamed;
WrappedCommand autoCmd, importedCmd;
ImportedCmdData data;
bool wasExported;
int i, result;
// If the specified namespace is null, use the current namespace.
if (namespace_Renamed == null)
{
ns = currNs;
}
else
{
ns = namespace_Renamed;
}
// First, invoke the "auto_import" command with the pattern
// being imported. This command is part of the Tcl library.
// It looks for imported commands in autoloaded libraries and
// loads them in. That way, they will be found when we try
// to create links below.
autoCmd = findCommand(interp, "auto_import", null, TCL.VarFlag.GLOBAL_ONLY);
if (autoCmd != null)
{
TclObject[] objv = new TclObject[2];
objv[0] = TclString.newInstance("auto_import");
objv[0].preserve();
objv[1] = TclString.newInstance(pattern);
objv[1].preserve();
cmd = autoCmd;
try
{
// Invoke the command with the arguments
cmd.cmd.cmdProc(interp, objv);
}
finally
{
objv[0].release();
objv[1].release();
}
interp.resetResult();
}
// From the pattern, find the namespace from which we are importing
// and get the simple pattern (no namespace qualifiers or ::'s) at
// the end.
if (pattern.Length == 0)
{
throw new TclException(interp, "empty import pattern");
}
// Java does not support passing an address so we pass
// an array of size 1 and then assign arr[0] to the value
Namespace[] importNsArr = new Namespace[1];
Namespace[] dummyArr = new Namespace[1];
string[] simplePatternArr = new string[1];
getNamespaceForQualName(interp, pattern, ns, TCL.VarFlag.LEAVE_ERR_MSG, importNsArr, dummyArr, dummyArr, simplePatternArr);
importNs = importNsArr[0];
simplePattern = simplePatternArr[0];
if (importNs == null)
{
throw new TclException(interp, "unknown namespace in import pattern \"" + pattern + "\"");
}
if (importNs == ns)
{
if ((System.Object) pattern == (System.Object) simplePattern)
{
throw new TclException(interp, "no namespace specified in import pattern \"" + pattern + "\"");
}
else
{
throw new TclException(interp, "import pattern \"" + pattern + "\" tries to import from namespace \"" + importNs.name + "\" into itself");
}
}
// Scan through the command table in the source namespace and look for
// exported commands that match the string pattern. Create an "imported
// command" in the current namespace for each imported command; these
// commands redirect their invocations to the "real" command.
for (search = importNs.cmdTable.Keys.GetEnumerator(); search.MoveNext(); )
{
cmdName = ((string) search.Current);
if (Util.stringMatch(cmdName, simplePattern))
{
// The command cmdName in the source namespace matches the
// pattern. Check whether it was exported. If it wasn't,
// we ignore it.
wasExported = false;
for (i = 0; i < importNs.numExportPatterns; i++)
{
if (Util.stringMatch(cmdName, importNs.exportArray[i]))
{
wasExported = true;
break;
}
}
if (!wasExported)
{
continue;
}
// Unless there is a name clash, create an imported command
// in the current namespace that refers to cmdPtr.
if ((ns.cmdTable[cmdName] == null) || allowOverwrite)
{
// Create the imported command and its client data.
// To create the new command in the current namespace,
// generate a fully qualified name for it.
System.Text.StringBuilder ds;
ds = new System.Text.StringBuilder();
ds.Append(ns.fullName);
if (ns != interp.globalNs)
{
ds.Append("::");
}
ds.Append(cmdName);
// Check whether creating the new imported command in the
// current namespace would create a cycle of imported->real
// command references that also would destroy an existing
// "real" command already in the current namespace.
cmd = (WrappedCommand) importNs.cmdTable[cmdName];
if (cmd.cmd is ImportedCmdData)
{
// This is actually an imported command, find
// the real command it references
realCmd = getOriginalCommand(cmd);
if ((realCmd != null) && (realCmd.ns == currNs) && (currNs.cmdTable[cmdName] != null))
{
throw new TclException(interp, "import pattern \"" + pattern + "\" would create a loop containing command \"" + ds.ToString() + "\"");
}
}
data = new ImportedCmdData();
// Create the imported command inside the interp
interp.createCommand(ds.ToString(), data);
// Lookup in the namespace for the new WrappedCommand
importedCmd = findCommand(interp, ds.ToString(), ns, (TCL.VarFlag.NAMESPACE_ONLY | TCL.VarFlag.LEAVE_ERR_MSG));
data.realCmd = cmd;
data.self = importedCmd;
// Create an ImportRef structure describing this new import
// command and add it to the import ref list in the "real"
// command.
ref_Renamed = new ImportRef();
ref_Renamed.importedCmd = importedCmd;
ref_Renamed.next = cmd.importRef;
cmd.importRef = ref_Renamed;
}
else
{
throw new TclException(interp, "can't import command \"" + cmdName + "\": already exists");
}
}
}
return ;
}
/*
*----------------------------------------------------------------------
*
* InvokeImportedCmd -> invokeImportedCmd
*
* Invoked by Tcl whenever the user calls an imported command that
* was created by Tcl_Import. Finds the "real" command (in another
* namespace), and passes control to it.
*
* Results:
* Returns if successful, raises TclException if something goes wrong.
*
* Side effects:
* Returns a result in the interpreter's result object. If anything
* goes wrong, the result object is set to an error message.
*
*----------------------------------------------------------------------
*/
internal static void invokeImportedCmd(Interp interp, ImportedCmdData data, TclObject[] objv)
{
WrappedCommand realCmd = data.realCmd;
realCmd.cmd.cmdProc(interp, objv);
}