diff options
Diffstat (limited to 'generic/tclTestProcBodyObj.c')
| -rw-r--r-- | generic/tclTestProcBodyObj.c | 309 |
1 files changed, 309 insertions, 0 deletions
diff --git a/generic/tclTestProcBodyObj.c b/generic/tclTestProcBodyObj.c new file mode 100644 index 0000000..4d32c5a --- /dev/null +++ b/generic/tclTestProcBodyObj.c @@ -0,0 +1,309 @@ +/* + * tclTestProcBodyObj.c -- + * + * Implements the "procbodytest" package, which contains commands to test + * creation of Tcl procedures whose body argument is a Tcl_Obj of type + * "procbody" rather than a string. + * + * Copyright (c) 1998 by Scriptics Corporation. + * + * See the file "license.terms" for information on usage and redistribution of + * this file, and for a DISCLAIMER OF ALL WARRANTIES. + */ + +#ifndef USE_TCL_STUBS +# define USE_TCL_STUBS +#endif +#include "tclInt.h" + +/* + * name and version of this package + */ + +static const char packageName[] = "procbodytest"; +static const char packageVersion[] = "1.0"; + +/* + * Name of the commands exported by this package + */ + +static const char procCommand[] = "proc"; + +/* + * this struct describes an entry in the table of command names and command + * procs + */ + +typedef struct CmdTable { + const char *cmdName; /* command name */ + Tcl_ObjCmdProc *proc; /* command proc */ + int exportIt; /* if 1, export the command */ +} CmdTable; + +/* + * Declarations for functions defined in this file. + */ + +static int ProcBodyTestProcObjCmd(ClientData dummy, + Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]); +static int ProcBodyTestInitInternal(Tcl_Interp *interp, int isSafe); +static int RegisterCommand(Tcl_Interp* interp, + const char *namespace, const CmdTable *cmdTablePtr); + +/* + * List of commands to create when the package is loaded; must go after the + * declarations of the enable command procedure. + */ + +static const CmdTable commands[] = { + { procCommand, ProcBodyTestProcObjCmd, 1 }, + { 0, 0, 0 } +}; + +static const CmdTable safeCommands[] = { + { procCommand, ProcBodyTestProcObjCmd, 1 }, + { 0, 0, 0 } +}; + +/* + *---------------------------------------------------------------------- + * + * Procbodytest_Init -- + * + * This function initializes the "procbodytest" package. + * + * Results: + * A standard Tcl result. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +int +Procbodytest_Init( + Tcl_Interp *interp) /* the Tcl interpreter for which the package + * is initialized */ +{ + return ProcBodyTestInitInternal(interp, 0); +} + +/* + *---------------------------------------------------------------------- + * + * Procbodytest_SafeInit -- + * + * This function initializes the "procbodytest" package. + * + * Results: + * A standard Tcl result. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +int +Procbodytest_SafeInit( + Tcl_Interp *interp) /* the Tcl interpreter for which the package + * is initialized */ +{ + return ProcBodyTestInitInternal(interp, 1); +} + +/* + *---------------------------------------------------------------------- + * + * RegisterCommand -- + * + * This function registers a command in the context of the given + * namespace. + * + * Results: + * A standard Tcl result. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +static int +RegisterCommand( + Tcl_Interp* interp, /* the Tcl interpreter for which the operation + * is performed */ + const char *namespace, /* the namespace in which the command is + * registered */ + const CmdTable *cmdTablePtr)/* the command to register */ +{ + char buf[128]; + + if (cmdTablePtr->exportIt) { + sprintf(buf, "namespace eval %s { namespace export %s }", + namespace, cmdTablePtr->cmdName); + if (Tcl_EvalEx(interp, buf, -1, 0) != TCL_OK) { + return TCL_ERROR; + } + } + + sprintf(buf, "%s::%s", namespace, cmdTablePtr->cmdName); + Tcl_CreateObjCommand(interp, buf, cmdTablePtr->proc, 0, 0); + return TCL_OK; +} + +/* + *---------------------------------------------------------------------- + * + * ProcBodyTestInitInternal -- + * + * This function initializes the Loader package. + * The isSafe flag is 1 if the interpreter is safe, 0 otherwise. + * + * Results: + * A standard Tcl result. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +static int +ProcBodyTestInitInternal( + Tcl_Interp *interp, /* the Tcl interpreter for which the package + * is initialized */ + int isSafe) /* 1 if this is a safe interpreter */ +{ + const CmdTable *cmdTablePtr; + + cmdTablePtr = (isSafe) ? &safeCommands[0] : &commands[0]; + for ( ; cmdTablePtr->cmdName ; cmdTablePtr++) { + if (RegisterCommand(interp, packageName, cmdTablePtr) != TCL_OK) { + return TCL_ERROR; + } + } + + return Tcl_PkgProvide(interp, packageName, packageVersion); +} + +/* + *---------------------------------------------------------------------- + * + * ProcBodyTestProcObjCmd -- + * + * Implements the "procbodytest::proc" command. Here is the command + * description: + * procbodytest::proc newName argList bodyName + * Looks up a procedure called $bodyName and, if the procedure exists, + * constructs a Tcl_Obj of type "procbody" and calls Tcl_ProcObjCmd. + * Arguments: + * newName the name of the procedure to be created + * argList the argument list for the procedure + * bodyName the name of an existing procedure from which the + * body is to be copied. + * This command can be used to trigger the branches in Tcl_ProcObjCmd that + * construct a proc from a "procbody", for example: + * proc a {x} {return $x} + * a 123 + * procbodytest::proc b {x} a + * Note the call to "a 123", which is necessary so that the Proc pointer + * for "a" is filled in by the internal compiler; this is a hack. + * + * Results: + * Returns a standard Tcl code. + * + * Side effects: + * A new procedure is created. + * Leaves an error message in the interp's result on error. + * + *---------------------------------------------------------------------- + */ + +static int +ProcBodyTestProcObjCmd( + ClientData dummy, /* context; not used */ + Tcl_Interp *interp, /* the current interpreter */ + int objc, /* argument count */ + Tcl_Obj *const objv[]) /* arguments */ +{ + const char *fullName; + Tcl_Command procCmd; + Command *cmdPtr; + Proc *procPtr = NULL; + Tcl_Obj *bodyObjPtr; + Tcl_Obj *myobjv[5]; + int result; + + if (objc != 4) { + Tcl_WrongNumArgs(interp, 1, objv, "newName argsList bodyName"); + return TCL_ERROR; + } + + /* + * Find the Command pointer to this procedure + */ + + fullName = Tcl_GetString(objv[3]); + procCmd = Tcl_FindCommand(interp, fullName, NULL, TCL_LEAVE_ERR_MSG); + if (procCmd == NULL) { + return TCL_ERROR; + } + + cmdPtr = (Command *) procCmd; + + /* + * check that this is a procedure and not a builtin command: + * If a procedure, cmdPtr->objClientData is TclIsProc(cmdPtr). + */ + + if (cmdPtr->objClientData != TclIsProc(cmdPtr)) { + Tcl_AppendStringsToObj(Tcl_GetObjResult(interp), + "command \"", fullName, "\" is not a Tcl procedure", NULL); + return TCL_ERROR; + } + + /* + * it is a Tcl procedure: the client data is the Proc structure + */ + + procPtr = (Proc *) cmdPtr->objClientData; + if (procPtr == NULL) { + Tcl_AppendStringsToObj(Tcl_GetObjResult(interp), "procedure \"", + fullName, "\" does not have a Proc struct!", NULL); + return TCL_ERROR; + } + + /* + * create a new object, initialize our argument vector, call into Tcl + */ + + bodyObjPtr = TclNewProcBodyObj(procPtr); + if (bodyObjPtr == NULL) { + Tcl_AppendStringsToObj(Tcl_GetObjResult(interp), + "failed to create a procbody object for procedure \"", + fullName, "\"", NULL); + return TCL_ERROR; + } + Tcl_IncrRefCount(bodyObjPtr); + + myobjv[0] = objv[0]; + myobjv[1] = objv[1]; + myobjv[2] = objv[2]; + myobjv[3] = bodyObjPtr; + myobjv[4] = NULL; + + result = Tcl_ProcObjCmd(NULL, interp, objc, myobjv); + Tcl_DecrRefCount(bodyObjPtr); + + return result; +} + +/* + * Local Variables: + * mode: c + * c-basic-offset: 4 + * fill-column: 78 + * End: + */ |