Tcl Source Code

Tcl_RegsubObjCmd(
    ClientData dummy,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    int idx, result, cflags, all, wlen, wsublen, numMatches, offset;
    int start, end, subStart, subEnd, match, command, numParts, numArgs;
    Tcl_RegExp regExpr;
    Tcl_RegExpInfo info;
    Tcl_Obj *resultPtr, *subPtr, *objPtr, *startIndex = NULL;
    Tcl_Obj **args = NULL, **parts;
    Tcl_UniChar ch, *wsrc, *wfirstChar, *wstring, *wsubspec, *wend;

    static const char *const options[] = {
	"-all",		"-command",	"-expanded",	"-line",
	"-linestop",	"-lineanchor",	"-nocase",	"-start",
	"--",		NULL
    };

	 * In command-prefix mode, the substitutions are added as quoted
	 * arguments to the subSpec to form a command, that is then executed
	 * and the result used as the string to substitute in. Actually,
	 * everything is passed through Tcl_EvalObjv, as that's much faster.
	 */

	if (command) {


	    if (args == NULL) {
		Tcl_ListObjGetElements(interp, subPtr, &numParts, &parts);
		numArgs = numParts + info.nsubs + 1;
		args = ckalloc(sizeof(Tcl_Obj*) * numArgs);
		memcpy(args, parts, sizeof(Tcl_Obj*) * numParts);
	    }

	    for (idx = 0 ; idx <= info.nsubs ; idx++) {
		subStart = info.matches[idx].start;
		subEnd = info.matches[idx].end;
		if ((subStart >= 0) && (subEnd >= 0)) {
		    args[idx + numParts] = Tcl_NewUnicodeObj(
			    wstring + offset + subStart, subEnd - subStart);

	     * afterwarsds; subPtr is handled in the main exit stanza.
	     */

	    result = Tcl_EvalObjv(interp, numArgs, args, 0);
	    for (idx = 0 ; idx <= info.nsubs ; idx++) {
		TclDecrRefCount(args[idx + numParts]);
	    }

	    if (result != TCL_OK) {
		if (result == TCL_ERROR) {
		    Tcl_AppendObjToErrorInfo(interp, Tcl_ObjPrintf(
			    "\n    (%s substitution computation script)",
			    options[REGSUB_COMMAND]));
		}
		goto done;

  done:
    if (objPtr && (objv[1] == objv[0])) {
	Tcl_DecrRefCount(objPtr);
    }
    if (subPtr && (objv[2] == objv[0])) {
	Tcl_DecrRefCount(subPtr);
    }
    if (args) {
	ckfree(args);
    }
    if (resultPtr) {
	Tcl_DecrRefCount(resultPtr);
    }
    return result;
}

/*