tclcmdah.c

tcl源码详细资料

#ifndef EXCLUDE_TCL

/* 
 * tclCmdAH.c --
 *
 *	This file contains the top-level command routines for most of
 *	the Tcl built-in commands whose names begin with the letters
 *	A to H.
 *
 * Copyright 1987-1991 Regents of the University of California
 * Permission to use, copy, modify, and distribute this
 * software and its documentation for any purpose and without
 * fee is hereby granted, provided that the above copyright
 * notice appear in all copies.  The University of California
 * makes no representations about the suitability of this
 * software for any purpose.  It is provided "as is" without
 * express or implied warranty.
 */

#include "tclInt.h"


/*
 *----------------------------------------------------------------------
 *
 * Tcl_BreakCmd --
 *
 *	This procedure is invoked to process the "break" Tcl command.
 *	See the user documentation for details on what it does.
 *
 * Results:
 *	A standard Tcl result.
 *
 * Side effects:
 *	See the user documentation.
 *
 *----------------------------------------------------------------------
 */

	/* ARGSUSED */
int
Tcl_BreakCmd(dummy, interp, argc, argv)
    ClientData dummy;			/* Not used. */
    Tcl_Interp *interp;			/* Current interpreter. */
    int argc;				/* Number of arguments. */
    char **argv;			/* Argument strings. */
{
    if (argc != 1) {
	Tcl_AppendResult(interp, "wrong # args: should be \"",
		argv[0], "\"", (char *) NULL);
	return TCL_ERROR;
    }
    return TCL_BREAK;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_CaseCmd --
 *
 *	This procedure is invoked to process the "case" Tcl command.
 *	See the user documentation for details on what it does.
 *
 * Results:
 *	A standard Tcl result.
 *
 * Side effects:
 *	See the user documentation.
 *
 *----------------------------------------------------------------------
 */

	/* ARGSUSED */
int
Tcl_CaseCmd(dummy, interp, argc, argv)
    ClientData dummy;			/* Not used. */
    Tcl_Interp *interp;			/* Current interpreter. */
    int argc;				/* Number of arguments. */
    char **argv;			/* Argument strings. */
{
    int i, result;
    int body;
    char *string;
    int caseArgc, splitArgs;
    char **caseArgv;

    if (argc < 3) {
	Tcl_AppendResult(interp, "wrong # args: should be \"",
		argv[0], " string ?in? patList body ... ?default body?\"",
		(char *) NULL);
	return TCL_ERROR;
    }
    string = argv[1];
    body = -1;
    if (strcmp(argv[2], "in") == 0) {
	i = 3;
    } else {
	i = 2;
    }
    caseArgc = argc - i;
    caseArgv = argv + i;

    /*
     * If all of the pattern/command pairs are lumped into a single
     * argument, split them out again.
     */

    splitArgs = 0;
    if (caseArgc == 1) {
	result = Tcl_SplitList(interp, caseArgv[0], &caseArgc, &caseArgv);
	if (result != TCL_OK) {
	    return result;
	}
	splitArgs = 1;
    }

    for (i = 0; i < caseArgc; i += 2) {
	int patArgc, j;
	char **patArgv;
	register char *p;

	if (i == (caseArgc-1)) {
	    interp->result = "extra case pattern with no body";
	    result = TCL_ERROR;
	    goto cleanup;
	}

	/*
	 * Check for special case of single pattern (no list) with
	 * no backslash sequences.
	 */

	for (p = caseArgv[i]; *p != 0; p++) {
	    if (isspace(*p) || (*p == '\\')) {
		break;
	    }
	}
	if (*p == 0) {
	    if ((*caseArgv[i] == 'd')
		    && (strcmp(caseArgv[i], "default") == 0)) {
		body = i+1;
	    }
	    if (Tcl_StringMatch(string, caseArgv[i])) {
		body = i+1;
		goto match;
	    }
	    continue;
	}

	/*
	 * Break up pattern lists, then check each of the patterns
	 * in the list.
	 */

	result = Tcl_SplitList(interp, caseArgv[i], &patArgc, &patArgv);
	if (result != TCL_OK) {
	    goto cleanup;
	}
	for (j = 0; j < patArgc; j++) {
	    if (Tcl_StringMatch(string, patArgv[j])) {
		body = i+1;
		break;
	    }
	}
	ckfree((char *) patArgv);
	if (j < patArgc) {
	    break;
	}
    }

    match:
    if (body != -1) {
	result = Tcl_Eval(interp, caseArgv[body], 0, (char **) NULL);
	if (result == TCL_ERROR) {
	    char msg[100];
	    sprintf(msg, "\n    (\"%.50s\" arm line %d)", caseArgv[body-1],
		    interp->errorLine);
	    Tcl_AddErrorInfo(interp, msg);
	}
	goto cleanup;
    }

    /*
     * Nothing matched:  return nothing.
     */

    result = TCL_OK;

    cleanup:
    if (splitArgs) {
	ckfree((char *) caseArgv);
    }
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_CatchCmd --
 *
 *	This procedure is invoked to process the "catch" Tcl command.
 *	See the user documentation for details on what it does.
 *
 * Results:
 *	A standard Tcl result.
 *
 * Side effects:
 *	See the user documentation.
 *
 *----------------------------------------------------------------------
 */

	/* ARGSUSED */
int
Tcl_CatchCmd(dummy, interp, argc, argv)
    ClientData dummy;			/* Not used. */
    Tcl_Interp *interp;			/* Current interpreter. */
    int argc;				/* Number of arguments. */
    char **argv;			/* Argument strings. */
{
    int result;

    if ((argc != 2) && (argc != 3)) {
	Tcl_AppendResult(interp, "wrong # args: should be \"",
		argv[0], " command ?varName?\"", (char *) NULL);
	return TCL_ERROR;
    }
    result = Tcl_Eval(interp, argv[1], 0, (char **) NULL);
    if (argc == 3) {
	if (Tcl_SetVar(interp, argv[2], interp->result, 0) == NULL) {
	    Tcl_SetResult(interp, "couldn't save command result in variable",
		    TCL_STATIC);
	    return TCL_ERROR;
	}
    }
    Tcl_ResetResult(interp);
    sprintf(interp->result, "%d", result);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_ConcatCmd --
 *
 *	This procedure is invoked to process the "concat" Tcl command.
 *	See the user documentation for details on what it does.
 *
 * Results:
 *	A standard Tcl result.
 *
 * Side effects:
 *	See the user documentation.
 *
 *----------------------------------------------------------------------
 */

	/* ARGSUSED */
int
Tcl_ConcatCmd(dummy, interp, argc, argv)
    ClientData dummy;			/* Not used. */
    Tcl_Interp *interp;			/* Current interpreter. */
    int argc;				/* Number of arguments. */
    char **argv;			/* Argument strings. */
{
    if (argc == 1) {
	Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
		" arg ?arg ...?\"", (char *) NULL);
	return TCL_ERROR;
    }

    interp->result = Tcl_Concat(argc-1, argv+1);
    interp->freeProc = (Tcl_FreeProc *) free;
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_ContinueCmd --
 *
 *	This procedure is invoked to process the "continue" Tcl command.
 *	See the user documentation for details on what it does.
 *
 * Results:
 *	A standard Tcl result.
 *
 * Side effects:
 *	See the user documentation.
 *
 *----------------------------------------------------------------------
 */

	/* ARGSUSED */
int
Tcl_ContinueCmd(dummy, interp, argc, argv)
    ClientData dummy;			/* Not used. */
    Tcl_Interp *interp;			/* Current interpreter. */
    int argc;				/* Number of arguments. */
    char **argv;			/* Argument strings. */
{
    if (argc != 1) {
	Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
		"\"", (char *) NULL);
	return TCL_ERROR;
    }
    return TCL_CONTINUE;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_ErrorCmd --
 *
 *	This procedure is invoked to process the "error" Tcl command.
 *	See the user documentation for details on what it does.
 *
 * Results:
 *	A standard Tcl result.
 *
 * Side effects:
 *	See the user documentation.
 *
 *----------------------------------------------------------------------
 */

	/* ARGSUSED */
int
Tcl_ErrorCmd(dummy, interp, argc, argv)
    ClientData dummy;			/* Not used. */
    Tcl_Interp *interp;			/* Current interpreter. */
    int argc;				/* Number of arguments. */
    char **argv;			/* Argument strings. */
{
    Interp *iPtr = (Interp *) interp;

    if ((argc < 2) || (argc > 4)) {
	Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
		" message ?errorInfo? ?errorCode?\"", (char *) NULL);
	return TCL_ERROR;
    }
    if ((argc >= 3) && (argv[2][0] != 0)) {
	Tcl_AddErrorInfo(interp, argv[2]);
	iPtr->flags |= ERR_ALREADY_LOGGED;
    }
    if (argc == 4) {
	Tcl_SetVar2(interp, "errorCode", (char *) NULL, argv[3],
		TCL_GLOBAL_ONLY);
	iPtr->flags |= ERROR_CODE_SET;
    }
    Tcl_SetResult(interp, argv[1], TCL_VOLATILE);
    return TCL_ERROR;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_EvalCmd --
 *
 *	This procedure is invoked to process the "eval" Tcl command.
 *	See the user documentation for details on what it does.
 *
 * Results:
 *	A standard Tcl result.
 *
 * Side effects:
 *	See the user documentation.
 *
 *----------------------------------------------------------------------
 */

	/* ARGSUSED */
int
Tcl_EvalCmd(dummy, interp, argc, argv)
    ClientData dummy;			/* Not used. */
    Tcl_Interp *interp;			/* Current interpreter. */
    int argc;				/* Number of arguments. */
    char **argv;			/* Argument strings. */
{
    int result;
    char *cmd;

    if (argc < 2) {
	Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
		" arg ?arg ...?\"", (char *) NULL);
	return TCL_ERROR;
    }
    if (argc == 2) {
	result = Tcl_Eval(interp, argv[1], 0, (char **) NULL);
    } else {
    
	/*
	 * More than one argument:  concatenate them together with spaces
	 * between, then evaluate the result.
	 */
    
	cmd = Tcl_Concat(argc-1, argv+1);
	result = Tcl_Eval(interp, cmd, 0, (char **) NULL);
	ckfree(cmd);
    }
    if (result == TCL_ERROR) {
	char msg[60];
	sprintf(msg, "\n    (\"eval\" body line %d)", interp->errorLine);
	Tcl_AddErrorInfo(interp, msg);
    }
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_ExprCmd --
 *
 *	This procedure is invoked to process the "expr" Tcl command.
 *	See the user documentation for details on what it does.
 *
 * Results:
 *	A standard Tcl result.
 *
 * Side effects:
 *	See the user documentation.
 *
 *----------------------------------------------------------------------
 */

	/* ARGSUSED */
int
Tcl_ExprCmd(dummy, interp, argc, argv)
    ClientData dummy;			/* Not used. */
    Tcl_Interp *interp;			/* Current interpreter. */
    int argc;				/* Number of arguments. */
    char **argv;			/* Argument strings. */
{
    if (argc != 2) {
	Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
		" expression\"", (char *) NULL);
	return TCL_ERROR;
    }

    return Tcl_ExprString(interp, argv[1]);
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_ForCmd --
 *
 *	This procedure is invoked to process the "for" Tcl command.
 *	See the user documentation for details on what it does.
 *
 * Results:
 *	A standard Tcl result.
 *
 * Side effects:
 *	See the user documentation.
 *
 *----------------------------------------------------------------------
 */

	/* ARGSUSED */