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/*
* base code for various Tcl extensions
* Copyright 2006-2012 Ian Jackson
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "chiark-tcl-base.h"
static void enum_nt_dup(Tcl_Obj *src, Tcl_Obj *dup) {
dup->internalRep= src->internalRep;
dup->typePtr= src->typePtr;
}
static void enum_nt_ustr(Tcl_Obj *o) {
abort();
}
static int enum_nt_sfa(Tcl_Interp *ip, Tcl_Obj *o) {
abort();
}
Tcl_ObjType cht_enum_nearlytype = {
"enum-nearly",
0, enum_nt_dup, enum_nt_ustr, enum_nt_sfa
};
Tcl_ObjType cht_enum1_nearlytype = {
"enum1-nearly",
0, enum_nt_dup, enum_nt_ustr, enum_nt_sfa
};
static void report_bad(Tcl_Interp *ip, const char *what, const char *supplied,
const void *first, size_t each,
int (*isvalid)(const void *entry),
void (*appres)(Tcl_Interp *ip, const void *entry)) {
int count, i;
const Byte *entry;
for (entry=first; isvalid(entry); entry+=each);
count= (entry - (const Byte*)first) / each;
Tcl_ResetResult(ip);
Tcl_AppendResult(ip, "bad ",what," \"",supplied,"\": must be",(char*)0);
for (i=0, entry=first; i<count; i++, entry+=each) {
Tcl_AppendResult(ip,
(char*)(i==0 ? " " :
i+1==count ? ", or " :
", "),
(char*)0);
appres(ip,entry);
}
}
static const char *enum_str(const void *p) { return *(const char*const*)p; }
static int isvalid_enum(const void *p) { return !!enum_str(p); }
static void appres_enum(Tcl_Interp *ip, const void *p) {
Tcl_AppendResult(ip, enum_str(p), (char*)0);
}
const void *cht_enum_lookup_cached_func(Tcl_Interp *ip, Tcl_Obj *o,
const void *firstentry, size_t entrysize,
const char *what) {
const char *supplied, *found;
const char *ep;
if (o->typePtr == &cht_enum_nearlytype &&
o->internalRep.twoPtrValue.ptr1 == firstentry)
return o->internalRep.twoPtrValue.ptr2;
supplied= Tcl_GetStringFromObj(o,0); assert(supplied);
for (ep= firstentry;
(found= *(const char*const*)ep) && strcmp(supplied,found);
ep += entrysize);
if (found) {
cht_objfreeir(o);
o->typePtr= &cht_enum_nearlytype;
o->internalRep.twoPtrValue.ptr1= (void*)firstentry;
o->internalRep.twoPtrValue.ptr2= (void*)ep;
return ep;
}
report_bad(ip,what,supplied, firstentry,entrysize, isvalid_enum,appres_enum);
return 0;
}
static int isvalid_enum1(const void *p) { return !!*(const char*)p; }
static void appres_enum1(Tcl_Interp *ip, const void *p) {
char buf[2];
buf[0]= *(const char*)p;
buf[1]= 0;
Tcl_AppendResult(ip, buf, (char*)0);
}
int cht_enum1_lookup_cached_func(Tcl_Interp *ip, Tcl_Obj *o,
const char *opts, const char *what) {
const char *supplied, *fp;
if (o->typePtr != &cht_enum1_nearlytype ||
o->internalRep.twoPtrValue.ptr1 != opts) {
supplied= Tcl_GetStringFromObj(o,0); assert(supplied);
if (!(strlen(supplied) == 1 &&
(fp= strchr(opts, supplied[0])))) {
report_bad(ip,what,supplied, opts,1, isvalid_enum1,appres_enum1);
return -1;
}
cht_objfreeir(o);
o->typePtr= &cht_enum1_nearlytype;
o->internalRep.twoPtrValue.ptr1= (void*)opts;
o->internalRep.twoPtrValue.ptr2= (void*)fp;
}
return (const char*)o->internalRep.twoPtrValue.ptr2 - opts;
}
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