/*
** This program is free software; you can redistribute it and/or
** modify it under the terms of the Simplified BSD License (also
** known as the "2-Clause License" or "FreeBSD License".)
**
** 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.
**
*******************************************************************************
** This file contains code used to bridge the TH1 and Tcl scripting languages.
*/
#include "config.h"
#ifdef FOSSIL_ENABLE_TCL
#include "th.h"
#include "tcl.h"
/*
** Are we being compiled against Tcl 8.6 or higher?
*/
#if (TCL_MAJOR_VERSION > 8) || \
((TCL_MAJOR_VERSION == 8) && (TCL_MINOR_VERSION >= 6))
/*
** Workaround NRE-specific issue in Tcl_EvalObjCmd (SF bug #3399564) by using
** Tcl_EvalObjv instead of invoking the objProc directly.
*/
#define USE_TCL_EVALOBJV 1
#endif
/*
** These macros are designed to reduce the redundant code required to marshal
** arguments from TH1 to Tcl.
*/
#define USE_ARGV_TO_OBJV() \
int objc; \
Tcl_Obj **objv; \
int i;
#define COPY_ARGV_TO_OBJV() \
objc = argc-1; \
objv = (Tcl_Obj **)ckalloc((unsigned)(objc * sizeof(Tcl_Obj *))); \
for(i=1; i<argc; i++){ \
objv[i-1] = Tcl_NewStringObj(argv[i], argl[i]); \
Tcl_IncrRefCount(objv[i-1]); \
}
#define FREE_ARGV_TO_OBJV() \
for(i=1; i<argc; i++){ \
Tcl_DecrRefCount(objv[i-1]); \
} \
ckfree((char *)objv);
/*
** Fetch the Tcl interpreter from the specified void pointer, cast to a Tcl
** context.
*/
#define GET_CTX_TCL_INTERP(ctx) \
((struct TclContext *)(ctx))->interp
/*
** Creates and initializes a Tcl interpreter for use with the specified TH1
** interpreter. Stores the created Tcl interpreter in the Tcl context supplied
** by the caller. This must be declared here because quite a few functions in
** this file need to use it before it can be defined.
*/
static int createTclInterp(Th_Interp *interp, void *pContext);
/*
** Returns the Tcl interpreter result as a string with the associated length.
** If the Tcl interpreter or the Tcl result are NULL, the length will be 0.
** If the length pointer is NULL, the length will not be stored.
*/
static char *getTclResult(
Tcl_Interp *pInterp,
int *pN
){
Tcl_Obj *resultPtr;
if( !pInterp ){ /* This should not happen. */
if( pN ) *pN = 0;
return 0;
}
resultPtr = Tcl_GetObjResult(pInterp);
if( !resultPtr ){ /* This should not happen either? */
if( pN ) *pN = 0;
return 0;
}
return Tcl_GetStringFromObj(resultPtr, pN);
}
/*
** Tcl context information used by TH1. This structure definition has been
** copied from and should be kept in sync with the one in "main.c".
*/
struct TclContext {
int argc;
char **argv;
Tcl_Interp *interp;
};
/*
** Syntax:
**
** tclEval arg ?arg ...?
*/
static int tclEval_command(
Th_Interp *interp,
void *ctx,
int argc,
const char **argv,
int *argl
){
Tcl_Interp *tclInterp;
Tcl_Obj *objPtr;
int rc;
int nResult;
const char *zResult;
if ( createTclInterp(interp, ctx)!=TH_OK ){
return TH_ERROR;
}
if( argc<2 ){
return Th_WrongNumArgs(interp, "tclEval arg ?arg ...?");
}
tclInterp = GET_CTX_TCL_INTERP(ctx);
if( !tclInterp || Tcl_InterpDeleted(tclInterp) ){
Th_ErrorMessage(interp, "invalid Tcl interpreter", (const char *)"", 0);
return TH_ERROR;
}
Tcl_Preserve((ClientData)tclInterp);
if( argc==2 ){
objPtr = Tcl_NewStringObj(argv[1], argl[1]);
Tcl_IncrRefCount(objPtr);
rc = Tcl_EvalObjEx(tclInterp, objPtr, 0);
Tcl_DecrRefCount(objPtr);
}else{
USE_ARGV_TO_OBJV();
COPY_ARGV_TO_OBJV();
objPtr = Tcl_ConcatObj(objc, objv);
Tcl_IncrRefCount(objPtr);
rc = Tcl_EvalObjEx(tclInterp, objPtr, 0);
Tcl_DecrRefCount(objPtr);
FREE_ARGV_TO_OBJV();
}
zResult = getTclResult(tclInterp, &nResult);
Th_SetResult(interp, zResult, nResult);
Tcl_Release((ClientData)tclInterp);
return rc;
}
/*
** Syntax:
**
** tclExpr arg ?arg ...?
*/
static int tclExpr_command(
Th_Interp *interp,
void *ctx,
int argc,
const char **argv,
int *argl
){
Tcl_Interp *tclInterp;
Tcl_Obj *objPtr;
Tcl_Obj *resultObjPtr;
int rc;
int nResult;
const char *zResult;
if ( createTclInterp(interp, ctx)!=TH_OK ){
return TH_ERROR;
}
if( argc<2 ){
return Th_WrongNumArgs(interp, "tclExpr arg ?arg ...?");
}
tclInterp = GET_CTX_TCL_INTERP(ctx);
if( !tclInterp || Tcl_InterpDeleted(tclInterp) ){
Th_ErrorMessage(interp, "invalid Tcl interpreter", (const char *)"", 0);
return TH_ERROR;
}
Tcl_Preserve((ClientData)tclInterp);
if( argc==2 ){
objPtr = Tcl_NewStringObj(argv[1], argl[1]);
Tcl_IncrRefCount(objPtr);
rc = Tcl_ExprObj(tclInterp, objPtr, &resultObjPtr);
Tcl_DecrRefCount(objPtr);
}else{
USE_ARGV_TO_OBJV();
COPY_ARGV_TO_OBJV();
objPtr = Tcl_ConcatObj(objc, objv);
Tcl_IncrRefCount(objPtr);
rc = Tcl_ExprObj(tclInterp, objPtr, &resultObjPtr);
Tcl_DecrRefCount(objPtr);
FREE_ARGV_TO_OBJV();
}
if( rc==TCL_OK ){
zResult = Tcl_GetStringFromObj(resultObjPtr, &nResult);
}else{
zResult = getTclResult(tclInterp, &nResult);
}
Th_SetResult(interp, zResult, nResult);
if( rc==TCL_OK ) Tcl_DecrRefCount(resultObjPtr);
Tcl_Release((ClientData)tclInterp);
return rc;
}
/*
** Syntax:
**
** tclInvoke command ?arg ...?
*/
static int tclInvoke_command(
Th_Interp *interp,
void *ctx,
int argc,
const char **argv,
int *argl
){
Tcl_Interp *tclInterp;
#ifndef USE_TCL_EVALOBJV
Tcl_Command command;
Tcl_CmdInfo cmdInfo;
#endif
int rc;
int nResult;
const char *zResult;
#ifndef USE_TCL_EVALOBJV
Tcl_Obj *objPtr;
#endif
USE_ARGV_TO_OBJV();
if ( createTclInterp(interp, ctx)!=TH_OK ){
return TH_ERROR;
}
if( argc<2 ){
return Th_WrongNumArgs(interp, "tclInvoke command ?arg ...?");
}
tclInterp = GET_CTX_TCL_INTERP(ctx);
if( !tclInterp || Tcl_InterpDeleted(tclInterp) ){
Th_ErrorMessage(interp, "invalid Tcl interpreter", (const char *)"", 0);
return TH_ERROR;
}
Tcl_Preserve((ClientData)tclInterp);
#ifndef USE_TCL_EVALOBJV
objPtr = Tcl_NewStringObj(argv[1], argl[1]);
Tcl_IncrRefCount(objPtr);
command = Tcl_GetCommandFromObj(tclInterp, objPtr);
if( !command || Tcl_GetCommandInfoFromToken(command,&cmdInfo)==0 ){
Th_ErrorMessage(interp, "Tcl command not found:", argv[1], argl[1]);
Tcl_DecrRefCount(objPtr);
Tcl_Release((ClientData)tclInterp);
return TH_ERROR;
}
if( !cmdInfo.objProc ){
Th_ErrorMessage(interp, "Cannot invoke Tcl command:", argv[1], argl[1]);
Tcl_DecrRefCount(objPtr);
Tcl_Release((ClientData)tclInterp);
return TH_ERROR;
}
Tcl_DecrRefCount(objPtr);
#endif
COPY_ARGV_TO_OBJV();
#ifdef USE_TCL_EVALOBJV
rc = Tcl_EvalObjv(tclInterp, objc, objv, 0);
#else
Tcl_ResetResult(tclInterp);
rc = cmdInfo.objProc(cmdInfo.objClientData, tclInterp, objc, objv);
#endif
FREE_ARGV_TO_OBJV();
zResult = getTclResult(tclInterp, &nResult);
Th_SetResult(interp, zResult, nResult);
Tcl_Release((ClientData)tclInterp);
return rc;
}
/*
** Syntax:
**
** th1Eval arg
*/
static int Th1EvalObjCmd(
ClientData clientData,
Tcl_Interp *interp,
int objc,
Tcl_Obj *CONST objv[]
){
Th_Interp *th1Interp;
int nArg;
const char *arg;
int rc;
if( objc!=2 ){
Tcl_WrongNumArgs(interp, 1, objv, "arg");
return TCL_ERROR;
}
th1Interp = (Th_Interp *)clientData;
if( !th1Interp ){
Tcl_AppendResult(interp, "invalid TH1 interpreter", NULL);
return TCL_ERROR;
}
arg = Tcl_GetStringFromObj(objv[1], &nArg);
rc = Th_Eval(th1Interp, 0, arg, nArg);
arg = Th_GetResult(th1Interp, &nArg);
Tcl_SetObjResult(interp, Tcl_NewStringObj(arg, nArg));
return rc;
}
/*
** Syntax:
**
** th1Expr arg
*/
static int Th1ExprObjCmd(
ClientData clientData,
Tcl_Interp *interp,
int objc,
Tcl_Obj *CONST objv[]
){
Th_Interp *th1Interp;
int nArg;
const char *arg;
int rc;
if( objc!=2 ){
Tcl_WrongNumArgs(interp, 1, objv, "arg");
return TCL_ERROR;
}
th1Interp = (Th_Interp *)clientData;
if( !th1Interp ){
Tcl_AppendResult(interp, "invalid TH1 interpreter", NULL);
return TCL_ERROR;
}
arg = Tcl_GetStringFromObj(objv[1], &nArg);
rc = Th_Expr(th1Interp, arg, nArg);
arg = Th_GetResult(th1Interp, &nArg);
Tcl_SetObjResult(interp, Tcl_NewStringObj(arg, nArg));
return rc;
}
/*
** Array of Tcl integration commands. Used when adding or removing the Tcl
** integration commands from TH1.
*/
static struct _Command {
const char *zName;
Th_CommandProc xProc;
void *pContext;
} aCommand[] = {
{"tclEval", tclEval_command, 0},
{"tclExpr", tclExpr_command, 0},
{"tclInvoke", tclInvoke_command, 0},
{0, 0, 0}
};
/*
** Called if the Tcl interpreter is deleted. Removes the Tcl integration
** commands from the TH1 interpreter.
*/
static void Th1DeleteProc(
ClientData clientData,
Tcl_Interp *interp
){
int i;
Th_Interp *th1Interp = (Th_Interp *)clientData;
if( !th1Interp ) return;
/* Remove the Tcl integration commands. */
for(i=0; i<(sizeof(aCommand)/sizeof(aCommand[0])); i++){
Th_RenameCommand(th1Interp, aCommand[i].zName, -1, NULL, 0);
}
}
/*
** Sets the "argv0", "argc", and "argv" script variables in the Tcl interpreter
** based on the supplied command line arguments.
*/
static int setTclArguments(
Tcl_Interp *pInterp,
int argc,
char **argv
){
Tcl_Obj *objPtr;
Tcl_Obj *resultObjPtr;
Tcl_Obj *listPtr;
int rc;
if( argc<=0 || !argv ){
return TCL_OK;
}
objPtr = Tcl_NewStringObj(argv[0], -1);
Tcl_IncrRefCount(objPtr);
resultObjPtr = Tcl_SetVar2Ex(pInterp, "argv0", NULL, objPtr,
TCL_GLOBAL_ONLY|TCL_LEAVE_ERR_MSG);
Tcl_DecrRefCount(objPtr);
if( !resultObjPtr ){
return TCL_ERROR;
}
objPtr = Tcl_NewIntObj(argc - 1);
Tcl_IncrRefCount(objPtr);
resultObjPtr = Tcl_SetVar2Ex(pInterp, "argc", NULL, objPtr,
TCL_GLOBAL_ONLY|TCL_LEAVE_ERR_MSG);
Tcl_DecrRefCount(objPtr);
if( !resultObjPtr ){
return TCL_ERROR;
}
if( argc>1 ){
listPtr = Tcl_NewListObj(0, NULL);
Tcl_IncrRefCount(listPtr);
while( --argc ){
objPtr = Tcl_NewStringObj(*++argv, -1);
Tcl_IncrRefCount(objPtr);
rc = Tcl_ListObjAppendElement(pInterp, listPtr, objPtr);
Tcl_DecrRefCount(objPtr);
if( rc!=TCL_OK ){
break;
}
}
if( rc==TCL_OK ){
resultObjPtr = Tcl_SetVar2Ex(pInterp, "argv", NULL, listPtr,
TCL_GLOBAL_ONLY|TCL_LEAVE_ERR_MSG);
if( !resultObjPtr ){
rc = TCL_ERROR;
}
}
Tcl_DecrRefCount(listPtr);
}
return rc;
}
/*
** Creates and initializes a Tcl interpreter for use with the specified TH1
** interpreter. Stores the created Tcl interpreter in the Tcl context supplied
** by the caller.
*/
static int createTclInterp(
Th_Interp *interp,
void *pContext
){
struct TclContext *tclContext = (struct TclContext *)pContext;
int argc;
char **argv;
Tcl_Interp *tclInterp;
if ( !tclContext ){
Th_ErrorMessage(interp,
"Invalid Tcl context", (const char *)"", 0);
return TH_ERROR;
}
if ( tclContext->interp ){
return TH_OK;
}
argc = tclContext->argc;
argv = tclContext->argv;
if ( argc>0 && argv ) {
Tcl_FindExecutable(argv[0]);
}
tclInterp = tclContext->interp = Tcl_CreateInterp();
if( !tclInterp || Tcl_InterpDeleted(tclInterp) ){
Th_ErrorMessage(interp,
"Could not create Tcl interpreter", (const char *)"", 0);
return TH_ERROR;
}
if( Tcl_Init(tclInterp)!=TCL_OK ){
Th_ErrorMessage(interp,
"Tcl initialization error:", Tcl_GetStringResult(tclInterp), -1);
Tcl_DeleteInterp(tclInterp);
tclContext->interp = tclInterp = 0;
return TH_ERROR;
}
if( setTclArguments(tclInterp, argc, argv)!=TCL_OK ){
Th_ErrorMessage(interp,
"Tcl error setting arguments:", Tcl_GetStringResult(tclInterp), -1);
Tcl_DeleteInterp(tclInterp);
tclContext->interp = tclInterp = 0;
return TH_ERROR;
}
/* Add the TH1 integration commands to Tcl. */
Tcl_CallWhenDeleted(tclInterp, Th1DeleteProc, interp);
Tcl_CreateObjCommand(tclInterp, "th1Eval", Th1EvalObjCmd, interp, NULL);
Tcl_CreateObjCommand(tclInterp, "th1Expr", Th1ExprObjCmd, interp, NULL);
return TH_OK;
}
/*
** Register the Tcl language commands with interpreter interp.
** Usually this is called soon after interpreter creation.
*/
int th_register_tcl(
Th_Interp *interp,
void *pContext
){
int i;
/* Add the Tcl integration commands to TH1. */
for(i=0; i<(sizeof(aCommand)/sizeof(aCommand[0])); i++){
void *ctx;
if ( !aCommand[i].zName || !aCommand[i].xProc ) continue;
ctx = aCommand[i].pContext;
/* Use Tcl interpreter for context? */
if( !ctx ) ctx = pContext;
Th_CreateCommand(interp, aCommand[i].zName, aCommand[i].xProc, ctx, 0);
}
return TH_OK;
}
#endif /* FOSSIL_ENABLE_TCL */