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/*
* tclIndexObj.c --
*
* This file implements objects of type "index". This object type
* is used to lookup a keyword in a table of valid values and cache
* the index of the matching entry.
*
* Copyright (c) 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.
*
* SCCS: @(#) tclIndexObj.c 1.4 97/02/11 13:30:01
*/
#include "tclInt.h"
/*
* Prototypes for procedures defined later in this file:
*/
static void DupIndexInternalRep _ANSI_ARGS_((Tcl_Obj *srcPtr,
Tcl_Obj *copyPtr));
static int SetIndexFromAny _ANSI_ARGS_((Tcl_Interp *interp,
Tcl_Obj *objPtr));
static void UpdateStringOfIndex _ANSI_ARGS_((Tcl_Obj *listPtr));
/*
* The structure below defines the index Tcl object type by means of
* procedures that can be invoked by generic object code.
*/
Tcl_ObjType tclIndexType = {
"index", /* name */
(Tcl_FreeInternalRepProc *) NULL, /* freeIntRepProc */
DupIndexInternalRep, /* dupIntRepProc */
UpdateStringOfIndex, /* updateStringProc */
SetIndexFromAny /* setFromAnyProc */
};
/*
*----------------------------------------------------------------------
*
* Tcl_GetIndexFromObj --
*
* This procedure looks up an object's value in a table of strings
* and returns the index of the matching string, if any.
*
* Results:
* If the value of objPtr is identical to or a unique abbreviation
* for one of the entries in objPtr, then the return value is
* TCL_OK and the index of the matching entry is stored at
* *indexPtr. If there isn't a proper match, then TCL_ERROR is
* returned and an error message is left in interp's result (unless
* interp is NULL). The msg argument is used in the error
* message; for example, if msg has the value "option" then the
* error message will say something flag 'bad option "foo": must be
* ...'
*
* Side effects:
* The result of the lookup is cached as the internal rep of
* objPtr, so that repeated lookups can be done quickly.
*
*----------------------------------------------------------------------
*/
int
Tcl_GetIndexFromObj(interp, objPtr, tablePtr, msg, flags, indexPtr)
Tcl_Interp *interp; /* Used for error reporting if not NULL. */
Tcl_Obj *objPtr; /* Object containing the string to lookup. */
char **tablePtr; /* Array of strings to compare against the
* value of objPtr; last entry must be NULL
* and there must not be duplicate entries. */
char *msg; /* Identifying word to use in error messages. */
int flags; /* 0 or TCL_EXACT */
int *indexPtr; /* Place to store resulting integer index. */
{
int index, length, i, numAbbrev;
char *key, *p1, *p2, **entryPtr;
Tcl_Obj *resultPtr;
/*
* See if there is a valid cached result from a previous lookup.
*/
if ((objPtr->typePtr == &tclIndexType)
&& (objPtr->internalRep.twoPtrValue.ptr1 == (VOID *) tablePtr)) {
*indexPtr = (int) objPtr->internalRep.twoPtrValue.ptr2;
return TCL_OK;
}
/*
* Lookup the value of the object in the table. Accept unique
* abbreviations unless TCL_EXACT is set in flags.
*/
key = Tcl_GetStringFromObj(objPtr, &length);
index = -1;
numAbbrev = 0;
for (entryPtr = tablePtr, i = 0; *entryPtr != NULL; entryPtr++, i++) {
for (p1 = key, p2 = *entryPtr; *p1 == *p2; p1++, p2++) {
if (*p1 == 0) {
index = i;
goto done;
}
}
if (*p1 == 0) {
/*
* The value is an abbreviation for this entry. Continue
* checking other entries to make sure it's unique. If we
* get more than one unique abbreviation, keep searching to
* see if there is an exact match, but remember the number
* of unique abbreviations and don't allow either.
*/
numAbbrev++;
index = i;
}
}
if ((flags & TCL_EXACT) || (numAbbrev != 1)) {
goto error;
}
done:
if ((objPtr->typePtr != NULL)
&& (objPtr->typePtr->freeIntRepProc != NULL)) {
objPtr->typePtr->freeIntRepProc(objPtr);
}
objPtr->internalRep.twoPtrValue.ptr1 = (VOID *) tablePtr;
objPtr->internalRep.twoPtrValue.ptr2 = (VOID *) index;
objPtr->typePtr = &tclIndexType;
*indexPtr = index;
return TCL_OK;
error:
if (interp != NULL) {
resultPtr = Tcl_GetObjResult(interp);
Tcl_AppendStringsToObj(resultPtr,
(numAbbrev > 1) ? "ambiguous " : "bad ", msg, " \"",
key, "\": must be ", *tablePtr, (char *) NULL);
for (entryPtr = tablePtr+1; *entryPtr != NULL; entryPtr++) {
if (entryPtr[1] == NULL) {
Tcl_AppendStringsToObj(resultPtr, ", or ", *entryPtr,
(char *) NULL);
} else {
Tcl_AppendStringsToObj(resultPtr, ", ", *entryPtr,
(char *) NULL);
}
}
}
return TCL_ERROR;
}
/*
*----------------------------------------------------------------------
*
* DupIndexInternalRep --
*
* Copy the internal representation of an index Tcl_Obj from one
* object to another.
*
* Results:
* None.
*
* Side effects:
* "copyPtr"s internal rep is set to same value as "srcPtr"s
* internal rep.
*
*----------------------------------------------------------------------
*/
static void
DupIndexInternalRep(srcPtr, copyPtr)
register Tcl_Obj *srcPtr; /* Object with internal rep to copy. */
register Tcl_Obj *copyPtr; /* Object with internal rep to set. */
{
copyPtr->internalRep.twoPtrValue.ptr1
= srcPtr->internalRep.twoPtrValue.ptr1;
copyPtr->internalRep.twoPtrValue.ptr2
= srcPtr->internalRep.twoPtrValue.ptr2;
copyPtr->typePtr = &tclIndexType;
}
/*
*----------------------------------------------------------------------
*
* SetIndexFromAny --
*
* This procedure is called to convert a Tcl object to index
* internal form. However, this doesn't make sense (need to have a
* table of keywords in order to do the conversion) so the
* procedure always generates an error.
*
* Results:
* The return value is always TCL_ERROR, and an error message is
* left in interp's result if interp isn't NULL.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static int
SetIndexFromAny(interp, objPtr)
Tcl_Interp *interp; /* Used for error reporting if not NULL. */
register Tcl_Obj *objPtr; /* The object to convert. */
{
Tcl_AppendToObj(Tcl_GetObjResult(interp),
"can't convert value to index except via Tcl_GetIndexFromObj API",
-1);
return TCL_ERROR;
}
/*
*----------------------------------------------------------------------
*
* UpdateStringOfIndex --
*
* This procedure is called to update the string representation for
* an index object. It should never be called, because we never
* invalidate the string representation for an index object.
*
* Results:
* None.
*
* Side effects:
* A panic is added
*
*----------------------------------------------------------------------
*/
static void
UpdateStringOfIndex(objPtr)
register Tcl_Obj *objPtr; /* Int object whose string rep to update. */
{
panic("UpdateStringOfIndex should never be invoked");
}
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