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/*
* tclHistory.c --
*
* This module and the Tcl library file history.tcl together implement
* Tcl command history. Tcl_RecordAndEval(Obj) can be called to record
* commands ("events") before they are executed. Commands defined in
* history.tcl may be used to perform history substitutions.
*
* Copyright © 1990-1993 The Regents of the University of California.
* Copyright © 1994-1997 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution of
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
*/
#include "tclInt.h"
/*
* Type of the assocData structure used to hold the reference to the [history
* add] subcommand, used in Tcl_RecordAndEvalObj.
*/
typedef struct {
Tcl_Obj *historyObj; /* == "::history" */
Tcl_Obj *addObj; /* == "add" */
} HistoryObjs;
#define HISTORY_OBJS_KEY "::tcl::HistoryObjs"
/*
* Static functions in this file.
*/
static Tcl_InterpDeleteProc DeleteHistoryObjs;
/*
*----------------------------------------------------------------------
*
* Tcl_RecordAndEval --
*
* This procedure adds its command argument to the current list of
* recorded events and then executes the command by calling Tcl_Eval.
*
* Results:
* The return value is a standard Tcl return value, the result of
* executing cmd.
*
* Side effects:
* The command is recorded and executed.
*
*----------------------------------------------------------------------
*/
int
Tcl_RecordAndEval(
Tcl_Interp *interp, /* Token for interpreter in which command will
* be executed. */
const char *cmd, /* Command to record. */
int flags) /* Additional flags. TCL_NO_EVAL means only
* record: don't execute command.
* TCL_EVAL_GLOBAL means use Tcl_GlobalEval
* instead of Tcl_Eval. */
{
Tcl_Obj *cmdPtr;
int result;
if (cmd[0]) {
/*
* Call Tcl_RecordAndEvalObj to do the actual work.
*/
cmdPtr = Tcl_NewStringObj(cmd, -1);
Tcl_IncrRefCount(cmdPtr);
result = Tcl_RecordAndEvalObj(interp, cmdPtr, flags);
/*
* Discard the Tcl object created to hold the command.
*/
Tcl_DecrRefCount(cmdPtr);
} else {
/*
* An empty string. Just reset the interpreter's result.
*/
Tcl_ResetResult(interp);
result = TCL_OK;
}
return result;
}
/*
*----------------------------------------------------------------------
*
* Tcl_RecordAndEvalObj --
*
* This procedure adds the command held in its argument object to the
* current list of recorded events and then executes the command by
* calling Tcl_EvalObj.
*
* Results:
* The return value is a standard Tcl return value, the result of
* executing the command.
*
* Side effects:
* The command is recorded and executed.
*
*----------------------------------------------------------------------
*/
int
Tcl_RecordAndEvalObj(
Tcl_Interp *interp, /* Token for interpreter in which command will
* be executed. */
Tcl_Obj *cmdPtr, /* Points to object holding the command to
* record and execute. */
int flags) /* Additional flags. TCL_NO_EVAL means record
* only: don't execute the command.
* TCL_EVAL_GLOBAL means evaluate the script
* in global variable context instead of the
* current procedure. */
{
int result, call = 1;
Tcl_CmdInfo info;
HistoryObjs *histObjsPtr =
(HistoryObjs *)Tcl_GetAssocData(interp, HISTORY_OBJS_KEY, NULL);
/*
* Create the references to the [::history add] command if necessary.
*/
if (histObjsPtr == NULL) {
histObjsPtr = (HistoryObjs *)Tcl_Alloc(sizeof(HistoryObjs));
TclNewLiteralStringObj(histObjsPtr->historyObj, "::history");
TclNewLiteralStringObj(histObjsPtr->addObj, "add");
Tcl_IncrRefCount(histObjsPtr->historyObj);
Tcl_IncrRefCount(histObjsPtr->addObj);
Tcl_SetAssocData(interp, HISTORY_OBJS_KEY, DeleteHistoryObjs,
histObjsPtr);
}
/*
* Do not call [history] if it has been replaced by an empty proc
*/
result = Tcl_GetCommandInfo(interp, "::history", &info);
if (result && (info.deleteProc == TclProcDeleteProc)) {
Proc *procPtr = (Proc *) info.objClientData;
call = (procPtr->cmdPtr->compileProc != TclCompileNoOp);
}
if (call) {
Tcl_Obj *list[3];
/*
* Do recording by eval'ing a tcl history command: history add $cmd.
*/
list[0] = histObjsPtr->historyObj;
list[1] = histObjsPtr->addObj;
list[2] = cmdPtr;
Tcl_IncrRefCount(cmdPtr);
(void) Tcl_EvalObjv(interp, 3, list, TCL_EVAL_GLOBAL);
Tcl_DecrRefCount(cmdPtr);
/*
* One possible failure mode above: exceeding a resource limit.
*/
if (Tcl_LimitExceeded(interp)) {
return TCL_ERROR;
}
}
/*
* Execute the command.
*/
result = TCL_OK;
if (!(flags & TCL_NO_EVAL)) {
result = Tcl_EvalObjEx(interp, cmdPtr, flags & TCL_EVAL_GLOBAL);
}
return result;
}
/*
*----------------------------------------------------------------------
*
* DeleteHistoryObjs --
*
* Called to delete the references to the constant words used when adding
* to the history.
*
* Results:
* None.
*
* Side effects:
* The constant words may be deleted.
*
*----------------------------------------------------------------------
*/
static void
DeleteHistoryObjs(
void *clientData,
TCL_UNUSED(Tcl_Interp *))
{
HistoryObjs *histObjsPtr = (HistoryObjs *)clientData;
TclDecrRefCount(histObjsPtr->historyObj);
TclDecrRefCount(histObjsPtr->addObj);
Tcl_Free(histObjsPtr);
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/
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