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authorWilliam Joye <wjoye@cfa.harvard.edu>2017-09-22 18:51:12 (GMT)
committerWilliam Joye <wjoye@cfa.harvard.edu>2017-09-22 18:51:12 (GMT)
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-'\"
-'\" Copyright (c) 1996-1997 Sun Microsystems, Inc.
-'\"
-'\" See the file "license.terms" for information on usage and redistribution
-'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
-'\"
-.TH Tcl_CreateObjCommand 3 8.0 Tcl "Tcl Library Procedures"
-.so man.macros
-.BS
-.SH NAME
-Tcl_CreateObjCommand, Tcl_DeleteCommand, Tcl_DeleteCommandFromToken, Tcl_GetCommandInfo, Tcl_GetCommandInfoFromToken, Tcl_SetCommandInfo, Tcl_SetCommandInfoFromToken, Tcl_GetCommandName, Tcl_GetCommandFullName, Tcl_GetCommandFromObj \- implement new commands in C
-.SH SYNOPSIS
-.nf
-\fB#include <tcl.h>\fR
-.sp
-Tcl_Command
-\fBTcl_CreateObjCommand\fR(\fIinterp, cmdName, proc, clientData, deleteProc\fR)
-.sp
-int
-\fBTcl_DeleteCommand\fR(\fIinterp, cmdName\fR)
-.sp
-int
-\fBTcl_DeleteCommandFromToken\fR(\fIinterp, token\fR)
-.sp
-int
-\fBTcl_GetCommandInfo\fR(\fIinterp, cmdName, infoPtr\fR)
-.sp
-int
-\fBTcl_SetCommandInfo\fR(\fIinterp, cmdName, infoPtr\fR)
-.sp
-int
-\fBTcl_GetCommandInfoFromToken\fR(\fItoken, infoPtr\fR)
-.sp
-int
-\fBTcl_SetCommandInfoFromToken\fR(\fItoken, infoPtr\fR)
-.sp
-const char *
-\fBTcl_GetCommandName\fR(\fIinterp, token\fR)
-.sp
-void
-\fBTcl_GetCommandFullName\fR(\fIinterp, token, objPtr\fR)
-.sp
-Tcl_Command
-\fBTcl_GetCommandFromObj\fR(\fIinterp, objPtr\fR)
-.SH ARGUMENTS
-.AS Tcl_CmdDeleteProc *deleteProc in/out
-.AP Tcl_Interp *interp in
-Interpreter in which to create a new command or that contains a command.
-.AP char *cmdName in
-Name of command.
-.AP Tcl_ObjCmdProc *proc in
-Implementation of the new command: \fIproc\fR will be called whenever
-\fIcmdName\fR is invoked as a command.
-.AP ClientData clientData in
-Arbitrary one-word value to pass to \fIproc\fR and \fIdeleteProc\fR.
-.AP Tcl_CmdDeleteProc *deleteProc in
-Procedure to call before \fIcmdName\fR is deleted from the interpreter;
-allows for command-specific cleanup. If NULL, then no procedure is
-called before the command is deleted.
-.AP Tcl_Command token in
-Token for command, returned by previous call to \fBTcl_CreateObjCommand\fR.
-The command must not have been deleted.
-.AP Tcl_CmdInfo *infoPtr in/out
-Pointer to structure containing various information about a
-Tcl command.
-.AP Tcl_Obj *objPtr in
-Value containing the name of a Tcl command.
-.BE
-.SH DESCRIPTION
-.PP
-\fBTcl_CreateObjCommand\fR defines a new command in \fIinterp\fR
-and associates it with procedure \fIproc\fR
-such that whenever \fIname\fR is
-invoked as a Tcl command (e.g., via a call to \fBTcl_EvalObjEx\fR)
-the Tcl interpreter will call \fIproc\fR to process the command.
-.PP
-\fBTcl_CreateObjCommand\fR deletes any existing command
-\fIname\fR already associated with the interpreter
-(however see below for an exception where the existing command
-is not deleted).
-It returns a token that may be used to refer
-to the command in subsequent calls to \fBTcl_GetCommandName\fR.
-If \fIname\fR contains any \fB::\fR namespace qualifiers,
-then the command is added to the specified namespace;
-otherwise the command is added to the global namespace.
-If \fBTcl_CreateObjCommand\fR is called for an interpreter that is in
-the process of being deleted, then it does not create a new command
-and it returns NULL.
-\fIproc\fR should have arguments and result that match the type
-\fBTcl_ObjCmdProc\fR:
-.PP
-.CS
-typedef int \fBTcl_ObjCmdProc\fR(
- ClientData \fIclientData\fR,
- Tcl_Interp *\fIinterp\fR,
- int \fIobjc\fR,
- Tcl_Obj *const \fIobjv\fR[]);
-.CE
-.PP
-When \fIproc\fR is invoked, the \fIclientData\fR and \fIinterp\fR parameters
-will be copies of the \fIclientData\fR and \fIinterp\fR arguments given to
-\fBTcl_CreateObjCommand\fR. Typically, \fIclientData\fR points to an
-application-specific data structure that describes what to do when the
-command procedure is invoked. \fIObjc\fR and \fIobjv\fR describe the
-arguments to the command, \fIobjc\fR giving the number of argument values
-(including the command name) and \fIobjv\fR giving the values of the
-arguments. The \fIobjv\fR array will contain \fIobjc\fR values, pointing to
-the argument values. Unlike \fIargv\fR[\fIargv\fR] used in a
-string-based command procedure, \fIobjv\fR[\fIobjc\fR] will not contain NULL.
-.PP
-Additionally, when \fIproc\fR is invoked, it must not modify the contents
-of the \fIobjv\fR array by assigning new pointer values to any element of the
-array (for example, \fIobjv\fR[\fB2\fR] = \fBNULL\fR) because this will
-cause memory to be lost and the runtime stack to be corrupted. The
-\fBconst\fR in the declaration of \fIobjv\fR will cause ANSI-compliant
-compilers to report any such attempted assignment as an error. However,
-it is acceptable to modify the internal representation of any individual
-value argument. For instance, the user may call
-\fBTcl_GetIntFromObj\fR on \fIobjv\fR[\fB2\fR] to obtain the integer
-representation of that value; that call may change the type of the value
-that \fIobjv\fR[\fB2\fR] points at, but will not change where
-\fIobjv\fR[\fB2\fR] points.
-.PP
-\fIproc\fR must return an integer code that is either \fBTCL_OK\fR,
-\fBTCL_ERROR\fR, \fBTCL_RETURN\fR, \fBTCL_BREAK\fR, or \fBTCL_CONTINUE\fR.
-See the Tcl overview man page
-for details on what these codes mean. Most normal commands will only
-return \fBTCL_OK\fR or \fBTCL_ERROR\fR.
-In addition, if \fIproc\fR needs to return a non-empty result,
-it can call \fBTcl_SetObjResult\fR to set the interpreter's result.
-In the case of a \fBTCL_OK\fR return code this gives the result
-of the command,
-and in the case of \fBTCL_ERROR\fR this gives an error message.
-Before invoking a command procedure,
-\fBTcl_EvalObjEx\fR sets interpreter's result to
-point to a value representing an empty string, so simple
-commands can return an empty result by doing nothing at all.
-.PP
-The contents of the \fIobjv\fR array belong to Tcl and are not
-guaranteed to persist once \fIproc\fR returns: \fIproc\fR should
-not modify them.
-Call \fBTcl_SetObjResult\fR if you want
-to return something from the \fIobjv\fR array.
-.PP
-Ordinarily, \fBTcl_CreateObjCommand\fR deletes any existing command
-\fIname\fR already associated with the interpreter.
-However, if the existing command was created by a previous call to
-\fBTcl_CreateCommand\fR,
-\fBTcl_CreateObjCommand\fR does not delete the command
-but instead arranges for the Tcl interpreter to call the
-\fBTcl_ObjCmdProc\fR \fIproc\fR in the future.
-The old string-based \fBTcl_CmdProc\fR associated with the command
-is retained and its address can be obtained by subsequent
-\fBTcl_GetCommandInfo\fR calls. This is done for backwards compatibility.
-.PP
-\fIDeleteProc\fR will be invoked when (if) \fIname\fR is deleted.
-This can occur through a call to \fBTcl_DeleteCommand\fR,
-\fBTcl_DeleteCommandFromToken\fR, or \fBTcl_DeleteInterp\fR,
-or by replacing \fIname\fR in another call to \fBTcl_CreateObjCommand\fR.
-\fIDeleteProc\fR is invoked before the command is deleted, and gives the
-application an opportunity to release any structures associated
-with the command. \fIDeleteProc\fR should have arguments and
-result that match the type \fBTcl_CmdDeleteProc\fR:
-.PP
-.CS
-typedef void \fBTcl_CmdDeleteProc\fR(
- ClientData \fIclientData\fR);
-.CE
-.PP
-The \fIclientData\fR argument will be the same as the \fIclientData\fR
-argument passed to \fBTcl_CreateObjCommand\fR.
-.PP
-\fBTcl_DeleteCommand\fR deletes a command from a command interpreter.
-Once the call completes, attempts to invoke \fIcmdName\fR in
-\fIinterp\fR will result in errors.
-If \fIcmdName\fR is not bound as a command in \fIinterp\fR then
-\fBTcl_DeleteCommand\fR does nothing and returns -1; otherwise
-it returns 0.
-There are no restrictions on \fIcmdName\fR: it may refer to
-a built-in command, an application-specific command, or a Tcl procedure.
-If \fIname\fR contains any \fB::\fR namespace qualifiers,
-the command is deleted from the specified namespace.
-.PP
-Given a token returned by \fBTcl_CreateObjCommand\fR,
-\fBTcl_DeleteCommandFromToken\fR deletes the command
-from a command interpreter.
-It will delete a command even if that command has been renamed.
-Once the call completes, attempts to invoke the command in
-\fIinterp\fR will result in errors.
-If the command corresponding to \fItoken\fR
-has already been deleted from \fIinterp\fR then
-\fBTcl_DeleteCommand\fR does nothing and returns -1;
-otherwise it returns 0.
-.PP
-\fBTcl_GetCommandInfo\fR checks to see whether its \fIcmdName\fR argument
-exists as a command in \fIinterp\fR.
-\fIcmdName\fR may include \fB::\fR namespace qualifiers
-to identify a command in a particular namespace.
-If the command is not found, then it returns 0.
-Otherwise it places information about the command
-in the \fBTcl_CmdInfo\fR structure
-pointed to by \fIinfoPtr\fR and returns 1.
-A \fBTcl_CmdInfo\fR structure has the following fields:
-.PP
-.CS
-typedef struct Tcl_CmdInfo {
- int \fIisNativeObjectProc\fR;
- Tcl_ObjCmdProc *\fIobjProc\fR;
- ClientData \fIobjClientData\fR;
- Tcl_CmdProc *\fIproc\fR;
- ClientData \fIclientData\fR;
- Tcl_CmdDeleteProc *\fIdeleteProc\fR;
- ClientData \fIdeleteData\fR;
- Tcl_Namespace *\fInamespacePtr\fR;
-} \fBTcl_CmdInfo\fR;
-.CE
-.PP
-The \fIisNativeObjectProc\fR field has the value 1
-if \fBTcl_CreateObjCommand\fR was called to register the command;
-it is 0 if only \fBTcl_CreateCommand\fR was called.
-It allows a program to determine whether it is faster to
-call \fIobjProc\fR or \fIproc\fR:
-\fIobjProc\fR is normally faster
-if \fIisNativeObjectProc\fR has the value 1.
-The fields \fIobjProc\fR and \fIobjClientData\fR
-have the same meaning as the \fIproc\fR and \fIclientData\fR
-arguments to \fBTcl_CreateObjCommand\fR;
-they hold information about the value-based command procedure
-that the Tcl interpreter calls to implement the command.
-The fields \fIproc\fR and \fIclientData\fR
-hold information about the string-based command procedure
-that implements the command.
-If \fBTcl_CreateCommand\fR was called for this command,
-this is the procedure passed to it;
-otherwise, this is a compatibility procedure
-registered by \fBTcl_CreateObjCommand\fR
-that simply calls the command's
-value-based procedure after converting its string arguments to Tcl values.
-The field \fIdeleteData\fR is the ClientData value
-to pass to \fIdeleteProc\fR; it is normally the same as
-\fIclientData\fR but may be set independently using the
-\fBTcl_SetCommandInfo\fR procedure.
-The field \fInamespacePtr\fR holds a pointer to the
-Tcl_Namespace that contains the command.
-.PP
-\fBTcl_GetCommandInfoFromToken\fR is identical to
-\fBTcl_GetCommandInfo\fR except that it uses a command token returned
-from \fBTcl_CreateObjCommand\fR in place of the command name. If the
-\fItoken\fR parameter is NULL, it returns 0; otherwise, it returns 1
-and fills in the structure designated by \fIinfoPtr\fR.
-.PP
-\fBTcl_SetCommandInfo\fR is used to modify the procedures and
-ClientData values associated with a command.
-Its \fIcmdName\fR argument is the name of a command in \fIinterp\fR.
-\fIcmdName\fR may include \fB::\fR namespace qualifiers
-to identify a command in a particular namespace.
-If this command does not exist then \fBTcl_SetCommandInfo\fR returns 0.
-Otherwise, it copies the information from \fI*infoPtr\fR to
-Tcl's internal structure for the command and returns 1.
-.PP
-\fBTcl_SetCommandInfoFromToken\fR is identical to
-\fBTcl_SetCommandInfo\fR except that it takes a command token as
-returned by \fBTcl_CreateObjCommand\fR instead of the command name.
-If the \fItoken\fR parameter is NULL, it returns 0. Otherwise, it
-copies the information from \fI*infoPtr\fR to Tcl's internal structure
-for the command and returns 1.
-.PP
-Note that \fBTcl_SetCommandInfo\fR and
-\fBTcl_SetCommandInfoFromToken\fR both allow the ClientData for a
-command's deletion procedure to be given a different value than the
-ClientData for its command procedure.
-.PP
-Note that neither \fBTcl_SetCommandInfo\fR nor
-\fBTcl_SetCommandInfoFromToken\fR will change a command's namespace.
-Use \fBTcl_Eval\fR to call the \fBrename\fR command to do that.
-.PP
-\fBTcl_GetCommandName\fR provides a mechanism for tracking commands
-that have been renamed.
-Given a token returned by \fBTcl_CreateObjCommand\fR
-when the command was created, \fBTcl_GetCommandName\fR returns the
-string name of the command. If the command has been renamed since it
-was created, then \fBTcl_GetCommandName\fR returns the current name.
-This name does not include any \fB::\fR namespace qualifiers.
-The command corresponding to \fItoken\fR must not have been deleted.
-The string returned by \fBTcl_GetCommandName\fR is in dynamic memory
-owned by Tcl and is only guaranteed to retain its value as long as the
-command is not deleted or renamed; callers should copy the string if
-they need to keep it for a long time.
-.PP
-\fBTcl_GetCommandFullName\fR produces the fully qualified name
-of a command from a command token.
-The name, including all namespace prefixes,
-is appended to the value specified by \fIobjPtr\fR.
-.PP
-\fBTcl_GetCommandFromObj\fR returns a token for the command
-specified by the name in a \fBTcl_Obj\fR.
-The command name is resolved relative to the current namespace.
-Returns NULL if the command is not found.
-.SH "SEE ALSO"
-Tcl_CreateCommand(3), Tcl_ResetResult(3), Tcl_SetObjResult(3)
-.SH KEYWORDS
-bind, command, create, delete, namespace, value