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/* subcommand.c - Automate handling of subcommands in Tcl.
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Copyright (C) 1997 Cygnus Solutions.
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Written by Tom Tromey <tromey@cygnus.com>. */
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#include <string.h>
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#include <tcl.h>
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#include "subcommand.h"
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/* A pointer to this structure is the clientdata for
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subcommand_implementation. */
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struct subcommand_clientdata
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{
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const struct ide_subcommand_table *commands;
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ClientData subdata;
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Tcl_CmdDeleteProc *delete;
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};
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/* This is called when one of our commands is deleted. */
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static void
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subcommand_deleted (ClientData cd)
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{
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struct subcommand_clientdata *data = (struct subcommand_clientdata *) cd;
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if (data->delete)
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(*data->delete) (data->subdata);
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Tcl_Free ((char *) data);
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}
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/* This function implements any Tcl command registered as having
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subcommands. The ClientData here must be a pointer to the command
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table. */
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static int
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subcommand_implementation (ClientData cd, Tcl_Interp *interp,
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int argc, char *argv[])
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{
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struct subcommand_clientdata *data = (struct subcommand_clientdata *) cd;
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const struct ide_subcommand_table *commands = data->commands;
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int i;
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if (argc < 2)
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{
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Tcl_AppendResult (interp, "wrong # args: must be \"",
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argv[0], " key ?arg ...?\"", (char *) NULL);
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return (TCL_ERROR);
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}
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for (i = 0; commands[i].method != NULL; ++i)
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{
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if (! strcmp (argv[1], commands[i].method))
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{
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if (argc < commands[i].min_args)
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{
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char buf[20];
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Tcl_AppendResult (interp, "wrong # args: got ", (char *) NULL);
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sprintf (buf, "%d", argc);
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Tcl_AppendResult (interp, buf, " but expected at least ",
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(char *) NULL);
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sprintf (buf, "%d", commands[i].min_args);
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Tcl_AppendResult (interp, buf, (char *) NULL);
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return (TCL_ERROR);
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}
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if (commands[i].max_args > 0 && argc > commands[i].max_args)
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{
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char buf[20];
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Tcl_AppendResult (interp, "wrong # args: got ", (char *) NULL);
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sprintf (buf, "%d", argc);
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Tcl_AppendResult (interp, buf, " but expected at most ",
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(char *) NULL);
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sprintf (buf, "%d", commands[i].max_args);
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Tcl_AppendResult (interp, buf, (char *) NULL);
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return (TCL_ERROR);
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}
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return (commands[i].func (data->subdata, interp, argc, argv));
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}
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}
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Tcl_AppendResult (interp, "unrecognized key \"", argv[1],
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"\"; must be one of ", (char *) NULL);
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for (i = 0; commands[i].method != NULL; ++i)
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Tcl_AppendResult (interp, "\"", commands[i].method,
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(commands[i + 1].method == NULL) ? "\"" : "\", ",
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(char *) NULL);
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return (TCL_ERROR);
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}
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/* Define a command with subcommands. */
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int
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ide_create_command_with_subcommands (Tcl_Interp *interp, char *name,
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const struct ide_subcommand_table *table,
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ClientData subdata,
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Tcl_CmdDeleteProc *delete)
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{
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int i;
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struct subcommand_clientdata *data;
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/* Sanity check. */
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for (i = 0; table[i].method != NULL; ++i)
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{
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if ((table[i].min_args > table[i].max_args && table[i].max_args != -1)
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|| table[i].min_args < 2
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|| table[i].max_args < -1)
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{
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Tcl_AppendResult (interp, "subcommand \"", table[i].method,
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"\" of command \"", name,
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"\" has bad argument count",
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(char *) NULL);
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return (TCL_ERROR);
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}
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}
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data = (struct subcommand_clientdata *) Tcl_Alloc (sizeof *data);
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data->commands = table;
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data->subdata = subdata;
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data->delete = delete;
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if (Tcl_CreateCommand (interp, name, subcommand_implementation,
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(ClientData) data, subcommand_deleted) == NULL)
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return (TCL_ERROR);
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return (TCL_OK);
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}
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