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Diffstat (limited to 'generic/tclEnsemble.c')
| -rw-r--r-- | generic/tclEnsemble.c | 2971 |
1 files changed, 2971 insertions, 0 deletions
diff --git a/generic/tclEnsemble.c b/generic/tclEnsemble.c new file mode 100644 index 0000000..59f38a9 --- /dev/null +++ b/generic/tclEnsemble.c @@ -0,0 +1,2971 @@ +/* + * tclEnsemble.c -- + * + * Contains support for ensembles (see TIP#112), which provide simple + * mechanism for creating composite commands on top of namespaces. + * + * Copyright (c) 2005-2010 Donal K. Fellows. + * + * See the file "license.terms" for information on usage and redistribution of + * this file, and for a DISCLAIMER OF ALL WARRANTIES. + */ + +#include "tclInt.h" +#include "tclCompile.h" + +/* + * Declarations for functions local to this file: + */ + +static inline int EnsembleUnknownCallback(Tcl_Interp *interp, + EnsembleConfig *ensemblePtr, int objc, + Tcl_Obj *const objv[], Tcl_Obj **prefixObjPtr); +static int NsEnsembleImplementationCmd(ClientData clientData, + Tcl_Interp *interp,int objc,Tcl_Obj *const objv[]); +static int NsEnsembleImplementationCmdNR(ClientData clientData, + Tcl_Interp *interp,int objc,Tcl_Obj *const objv[]); +static void BuildEnsembleConfig(EnsembleConfig *ensemblePtr); +static int NsEnsembleStringOrder(const void *strPtr1, + const void *strPtr2); +static void DeleteEnsembleConfig(ClientData clientData); +static void MakeCachedEnsembleCommand(Tcl_Obj *objPtr, + EnsembleConfig *ensemblePtr, + const char *subcmdName, Tcl_Obj *prefixObjPtr); +static void FreeEnsembleCmdRep(Tcl_Obj *objPtr); +static void DupEnsembleCmdRep(Tcl_Obj *objPtr, Tcl_Obj *copyPtr); +static void StringOfEnsembleCmdRep(Tcl_Obj *objPtr); + +/* + * The lists of subcommands and options for the [namespace ensemble] command. + */ + +static const char *const ensembleSubcommands[] = { + "configure", "create", "exists", NULL +}; +enum EnsSubcmds { + ENS_CONFIG, ENS_CREATE, ENS_EXISTS +}; + +static const char *const ensembleCreateOptions[] = { + "-command", "-map", "-parameters", "-prefixes", "-subcommands", + "-unknown", NULL +}; +enum EnsCreateOpts { + CRT_CMD, CRT_MAP, CRT_PARAM, CRT_PREFIX, CRT_SUBCMDS, CRT_UNKNOWN +}; + +static const char *const ensembleConfigOptions[] = { + "-map", "-namespace", "-parameters", "-prefixes", "-subcommands", + "-unknown", NULL +}; +enum EnsConfigOpts { + CONF_MAP, CONF_NAMESPACE, CONF_PARAM, CONF_PREFIX, CONF_SUBCMDS, + CONF_UNKNOWN +}; + +/* + * This structure defines a Tcl object type that contains a reference to an + * ensemble subcommand (e.g. the "length" in [string length ab]). It is used + * to cache the mapping between the subcommand itself and the real command + * that implements it. + */ + +const Tcl_ObjType tclEnsembleCmdType = { + "ensembleCommand", /* the type's name */ + FreeEnsembleCmdRep, /* freeIntRepProc */ + DupEnsembleCmdRep, /* dupIntRepProc */ + StringOfEnsembleCmdRep, /* updateStringProc */ + NULL /* setFromAnyProc */ +}; + +/* + *---------------------------------------------------------------------- + * + * TclNamespaceEnsembleCmd -- + * + * Invoked to implement the "namespace ensemble" command that creates and + * manipulates ensembles built on top of namespaces. Handles the + * following syntax: + * + * namespace ensemble name ?dictionary? + * + * Results: + * Returns TCL_OK if successful, and TCL_ERROR if anything goes wrong. + * + * Side effects: + * Creates the ensemble for the namespace if one did not previously + * exist. Alternatively, alters the way that the ensemble's subcommand => + * implementation prefix is configured. + * + *---------------------------------------------------------------------- + */ + +int +TclNamespaceEnsembleCmd( + ClientData dummy, + Tcl_Interp *interp, + int objc, + Tcl_Obj *const objv[]) +{ + Tcl_Namespace *namespacePtr; + Namespace *nsPtr = (Namespace *) TclGetCurrentNamespace(interp); + Tcl_Command token; + Tcl_DictSearch search; + Tcl_Obj *listObj; + int index, done; + + if (nsPtr == NULL || nsPtr->flags & NS_DYING) { + if (!Tcl_InterpDeleted(interp)) { + Tcl_AppendResult(interp, + "tried to manipulate ensemble of deleted namespace", + NULL); + } + return TCL_ERROR; + } + + if (objc < 2) { + Tcl_WrongNumArgs(interp, 1, objv, "subcommand ?arg ...?"); + return TCL_ERROR; + } + if (Tcl_GetIndexFromObj(interp, objv[1], ensembleSubcommands, + "subcommand", 0, &index) != TCL_OK) { + return TCL_ERROR; + } + + switch ((enum EnsSubcmds) index) { + case ENS_CREATE: { + const char *name; + int len, allocatedMapFlag = 0; + /* + * Defaults + */ + Tcl_Obj *subcmdObj = NULL; + Tcl_Obj *mapObj = NULL; + int permitPrefix = 1; + Tcl_Obj *unknownObj = NULL; + Tcl_Obj *paramObj = NULL; + + /* + * Check that we've got option-value pairs... [Bug 1558654] + */ + + if (objc & 1) { + Tcl_WrongNumArgs(interp, 2, objv, "?option value ...?"); + return TCL_ERROR; + } + objv += 2; + objc -= 2; + + /* + * Work out what name to use for the command to create. If supplied, + * it is either fully specified or relative to the current namespace. + * If not supplied, it is exactly the name of the current namespace. + */ + + name = nsPtr->fullName; + + /* + * Parse the option list, applying type checks as we go. Note that we + * are not incrementing any reference counts in the objects at this + * stage, so the presence of an option multiple times won't cause any + * memory leaks. + */ + + for (; objc>1 ; objc-=2,objv+=2) { + if (Tcl_GetIndexFromObj(interp, objv[0], ensembleCreateOptions, + "option", 0, &index) != TCL_OK) { + if (allocatedMapFlag) { + Tcl_DecrRefCount(mapObj); + } + return TCL_ERROR; + } + switch ((enum EnsCreateOpts) index) { + case CRT_CMD: + name = TclGetString(objv[1]); + continue; + case CRT_SUBCMDS: + if (TclListObjLength(interp, objv[1], &len) != TCL_OK) { + if (allocatedMapFlag) { + Tcl_DecrRefCount(mapObj); + } + return TCL_ERROR; + } + subcmdObj = (len > 0 ? objv[1] : NULL); + continue; + case CRT_PARAM: + if (TclListObjLength(interp, objv[1], &len) != TCL_OK) { + if (allocatedMapFlag) { + Tcl_DecrRefCount(mapObj); + } + return TCL_ERROR; + } + paramObj = (len > 0 ? objv[1] : NULL); + continue; + case CRT_MAP: { + Tcl_Obj *patchedDict = NULL, *subcmdWordsObj; + + /* + * Verify that the map is sensible. + */ + + if (Tcl_DictObjFirst(interp, objv[1], &search, + &subcmdWordsObj, &listObj, &done) != TCL_OK) { + if (allocatedMapFlag) { + Tcl_DecrRefCount(mapObj); + } + return TCL_ERROR; + } + if (done) { + mapObj = NULL; + continue; + } + do { + Tcl_Obj **listv; + const char *cmd; + + if (TclListObjGetElements(interp, listObj, &len, + &listv) != TCL_OK) { + Tcl_DictObjDone(&search); + if (patchedDict) { + Tcl_DecrRefCount(patchedDict); + } + if (allocatedMapFlag) { + Tcl_DecrRefCount(mapObj); + } + return TCL_ERROR; + } + if (len < 1) { + Tcl_SetResult(interp, + "ensemble subcommand implementations " + "must be non-empty lists", TCL_STATIC); + Tcl_DictObjDone(&search); + if (patchedDict) { + Tcl_DecrRefCount(patchedDict); + } + if (allocatedMapFlag) { + Tcl_DecrRefCount(mapObj); + } + return TCL_ERROR; + } + cmd = TclGetString(listv[0]); + if (!(cmd[0] == ':' && cmd[1] == ':')) { + Tcl_Obj *newList = Tcl_NewListObj(len, listv); + Tcl_Obj *newCmd = Tcl_NewStringObj(nsPtr->fullName,-1); + + if (nsPtr->parentPtr) { + Tcl_AppendStringsToObj(newCmd, "::", NULL); + } + Tcl_AppendObjToObj(newCmd, listv[0]); + Tcl_ListObjReplace(NULL, newList, 0, 1, 1, &newCmd); + if (patchedDict == NULL) { + patchedDict = Tcl_DuplicateObj(objv[1]); + } + Tcl_DictObjPut(NULL, patchedDict, subcmdWordsObj, + newList); + } + Tcl_DictObjNext(&search, &subcmdWordsObj,&listObj, &done); + } while (!done); + + if (allocatedMapFlag) { + Tcl_DecrRefCount(mapObj); + } + mapObj = (patchedDict ? patchedDict : objv[1]); + if (patchedDict) { + allocatedMapFlag = 1; + } + continue; + } + case CRT_PREFIX: + if (Tcl_GetBooleanFromObj(interp, objv[1], + &permitPrefix) != TCL_OK) { + if (allocatedMapFlag) { + Tcl_DecrRefCount(mapObj); + } + return TCL_ERROR; + } + continue; + case CRT_UNKNOWN: + if (TclListObjLength(interp, objv[1], &len) != TCL_OK) { + if (allocatedMapFlag) { + Tcl_DecrRefCount(mapObj); + } + return TCL_ERROR; + } + unknownObj = (len > 0 ? objv[1] : NULL); + continue; + } + } + + /* + * Create the ensemble. Note that this might delete another ensemble + * linked to the same namespace, so we must be careful. However, we + * should be OK because we only link the namespace into the list once + * we've created it (and after any deletions have occurred.) + */ + + token = Tcl_CreateEnsemble(interp, name, NULL, + (permitPrefix ? TCL_ENSEMBLE_PREFIX : 0)); + Tcl_SetEnsembleSubcommandList(interp, token, subcmdObj); + Tcl_SetEnsembleMappingDict(interp, token, mapObj); + Tcl_SetEnsembleUnknownHandler(interp, token, unknownObj); + Tcl_SetEnsembleParameterList(interp, token, paramObj); + + /* + * Tricky! Must ensure that the result is not shared (command delete + * traces could have corrupted the pristine object that we started + * with). [Snit test rename-1.5] + */ + + Tcl_ResetResult(interp); + Tcl_GetCommandFullName(interp, token, Tcl_GetObjResult(interp)); + return TCL_OK; + } + + case ENS_EXISTS: + if (objc != 3) { + Tcl_WrongNumArgs(interp, 2, objv, "cmdname"); + return TCL_ERROR; + } + Tcl_SetObjResult(interp, Tcl_NewBooleanObj( + Tcl_FindEnsemble(interp, objv[2], 0) != NULL)); + return TCL_OK; + + case ENS_CONFIG: + if (objc < 3 || (objc != 4 && !(objc & 1))) { + Tcl_WrongNumArgs(interp, 2, objv, + "cmdname ?-option value ...? ?arg ...?"); + return TCL_ERROR; + } + token = Tcl_FindEnsemble(interp, objv[2], TCL_LEAVE_ERR_MSG); + if (token == NULL) { + return TCL_ERROR; + } + + if (objc == 4) { + Tcl_Obj *resultObj = NULL; /* silence gcc 4 warning */ + + if (Tcl_GetIndexFromObj(interp, objv[3], ensembleConfigOptions, + "option", 0, &index) != TCL_OK) { + return TCL_ERROR; + } + switch ((enum EnsConfigOpts) index) { + case CONF_SUBCMDS: + Tcl_GetEnsembleSubcommandList(NULL, token, &resultObj); + if (resultObj != NULL) { + Tcl_SetObjResult(interp, resultObj); + } + break; + case CONF_PARAM: + Tcl_GetEnsembleParameterList(NULL, token, &resultObj); + if (resultObj != NULL) { + Tcl_SetObjResult(interp, resultObj); + } + break; + case CONF_MAP: + Tcl_GetEnsembleMappingDict(NULL, token, &resultObj); + if (resultObj != NULL) { + Tcl_SetObjResult(interp, resultObj); + } + break; + case CONF_NAMESPACE: + namespacePtr = NULL; /* silence gcc 4 warning */ + Tcl_GetEnsembleNamespace(NULL, token, &namespacePtr); + Tcl_SetResult(interp, ((Namespace *) namespacePtr)->fullName, + TCL_VOLATILE); + break; + case CONF_PREFIX: { + int flags = 0; /* silence gcc 4 warning */ + + Tcl_GetEnsembleFlags(NULL, token, &flags); + Tcl_SetObjResult(interp, + Tcl_NewBooleanObj(flags & TCL_ENSEMBLE_PREFIX)); + break; + } + case CONF_UNKNOWN: + Tcl_GetEnsembleUnknownHandler(NULL, token, &resultObj); + if (resultObj != NULL) { + Tcl_SetObjResult(interp, resultObj); + } + break; + } + } else if (objc == 3) { + /* + * Produce list of all information. + */ + + Tcl_Obj *resultObj, *tmpObj = NULL; /* silence gcc 4 warning */ + int flags = 0; /* silence gcc 4 warning */ + + TclNewObj(resultObj); + + /* -map option */ + Tcl_ListObjAppendElement(NULL, resultObj, + Tcl_NewStringObj(ensembleConfigOptions[CONF_MAP], -1)); + Tcl_GetEnsembleMappingDict(NULL, token, &tmpObj); + Tcl_ListObjAppendElement(NULL, resultObj, + (tmpObj != NULL) ? tmpObj : Tcl_NewObj()); + + /* -namespace option */ + Tcl_ListObjAppendElement(NULL, resultObj, + Tcl_NewStringObj(ensembleConfigOptions[CONF_NAMESPACE], + -1)); + namespacePtr = NULL; /* silence gcc 4 warning */ + Tcl_GetEnsembleNamespace(NULL, token, &namespacePtr); + Tcl_ListObjAppendElement(NULL, resultObj, + Tcl_NewStringObj(((Namespace *) namespacePtr)->fullName, + -1)); + + /* -parameters option */ + Tcl_ListObjAppendElement(NULL, resultObj, + Tcl_NewStringObj(ensembleConfigOptions[CONF_PARAM], -1)); + Tcl_GetEnsembleParameterList(NULL, token, &tmpObj); + Tcl_ListObjAppendElement(NULL, resultObj, + (tmpObj != NULL) ? tmpObj : Tcl_NewObj()); + + /* -prefix option */ + Tcl_ListObjAppendElement(NULL, resultObj, + Tcl_NewStringObj(ensembleConfigOptions[CONF_PREFIX], -1)); + Tcl_GetEnsembleFlags(NULL, token, &flags); + Tcl_ListObjAppendElement(NULL, resultObj, + Tcl_NewBooleanObj(flags & TCL_ENSEMBLE_PREFIX)); + + /* -subcommands option */ + Tcl_ListObjAppendElement(NULL, resultObj, + Tcl_NewStringObj(ensembleConfigOptions[CONF_SUBCMDS],-1)); + Tcl_GetEnsembleSubcommandList(NULL, token, &tmpObj); + Tcl_ListObjAppendElement(NULL, resultObj, + (tmpObj != NULL) ? tmpObj : Tcl_NewObj()); + + /* -unknown option */ + Tcl_ListObjAppendElement(NULL, resultObj, + Tcl_NewStringObj(ensembleConfigOptions[CONF_UNKNOWN],-1)); + Tcl_GetEnsembleUnknownHandler(NULL, token, &tmpObj); + Tcl_ListObjAppendElement(NULL, resultObj, + (tmpObj != NULL) ? tmpObj : Tcl_NewObj()); + + Tcl_SetObjResult(interp, resultObj); + } else { + int len, allocatedMapFlag = 0; + Tcl_Obj *subcmdObj = NULL, *mapObj = NULL, *paramObj = NULL, + *unknownObj = NULL; /* Defaults, silence gcc 4 warnings */ + int permitPrefix, flags = 0; /* silence gcc 4 warning */ + + Tcl_GetEnsembleSubcommandList(NULL, token, &subcmdObj); + Tcl_GetEnsembleMappingDict(NULL, token, &mapObj); + Tcl_GetEnsembleParameterList(NULL, token, ¶mObj); + Tcl_GetEnsembleUnknownHandler(NULL, token, &unknownObj); + Tcl_GetEnsembleFlags(NULL, token, &flags); + permitPrefix = (flags & TCL_ENSEMBLE_PREFIX) != 0; + + objv += 3; + objc -= 3; + + /* + * Parse the option list, applying type checks as we go. Note that + * we are not incrementing any reference counts in the objects at + * this stage, so the presence of an option multiple times won't + * cause any memory leaks. + */ + + for (; objc>0 ; objc-=2,objv+=2) { + if (Tcl_GetIndexFromObj(interp, objv[0],ensembleConfigOptions, + "option", 0, &index) != TCL_OK) { + freeMapAndError: + if (allocatedMapFlag) { + Tcl_DecrRefCount(mapObj); + } + return TCL_ERROR; + } + switch ((enum EnsConfigOpts) index) { + case CONF_SUBCMDS: + if (TclListObjLength(interp, objv[1], &len) != TCL_OK) { + goto freeMapAndError; + } + subcmdObj = (len > 0 ? objv[1] : NULL); + continue; + case CONF_PARAM: + if (TclListObjLength(interp, objv[1], &len) != TCL_OK) { + goto freeMapAndError; + } + paramObj = (len > 0 ? objv[1] : NULL); + continue; + case CONF_MAP: { + Tcl_Obj *patchedDict = NULL, *subcmdWordsObj, **listv; + const char *cmd; + + /* + * Verify that the map is sensible. + */ + + if (Tcl_DictObjFirst(interp, objv[1], &search, + &subcmdWordsObj, &listObj, &done) != TCL_OK) { + goto freeMapAndError; + } + if (done) { + mapObj = NULL; + continue; + } + do { + if (TclListObjGetElements(interp, listObj, &len, + &listv) != TCL_OK) { + Tcl_DictObjDone(&search); + if (patchedDict) { + Tcl_DecrRefCount(patchedDict); + } + goto freeMapAndError; + } + if (len < 1) { + Tcl_SetResult(interp, + "ensemble subcommand implementations " + "must be non-empty lists", TCL_STATIC); + Tcl_DictObjDone(&search); + if (patchedDict) { + Tcl_DecrRefCount(patchedDict); + } + goto freeMapAndError; + } + cmd = TclGetString(listv[0]); + if (!(cmd[0] == ':' && cmd[1] == ':')) { + Tcl_Obj *newList = Tcl_DuplicateObj(listObj); + Tcl_Obj *newCmd = + Tcl_NewStringObj(nsPtr->fullName, -1); + + if (nsPtr->parentPtr) { + Tcl_AppendStringsToObj(newCmd, "::", NULL); + } + Tcl_AppendObjToObj(newCmd, listv[0]); + Tcl_ListObjReplace(NULL, newList, 0,1, 1,&newCmd); + if (patchedDict == NULL) { + patchedDict = Tcl_DuplicateObj(objv[1]); + } + Tcl_DictObjPut(NULL, patchedDict, subcmdWordsObj, + newList); + } + Tcl_DictObjNext(&search, &subcmdWordsObj, &listObj, + &done); + } while (!done); + if (allocatedMapFlag) { + Tcl_DecrRefCount(mapObj); + } + mapObj = (patchedDict ? patchedDict : objv[1]); + if (patchedDict) { + allocatedMapFlag = 1; + } + continue; + } + case CONF_NAMESPACE: + Tcl_AppendResult(interp, "option -namespace is read-only", + NULL); + goto freeMapAndError; + case CONF_PREFIX: + if (Tcl_GetBooleanFromObj(interp, objv[1], + &permitPrefix) != TCL_OK) { + goto freeMapAndError; + } + continue; + case CONF_UNKNOWN: + if (TclListObjLength(interp, objv[1], &len) != TCL_OK) { + goto freeMapAndError; + } + unknownObj = (len > 0 ? objv[1] : NULL); + continue; + } + } + + /* + * Update the namespace now that we've finished the parsing stage. + */ + + flags = (permitPrefix ? flags|TCL_ENSEMBLE_PREFIX + : flags&~TCL_ENSEMBLE_PREFIX); + Tcl_SetEnsembleSubcommandList(interp, token, subcmdObj); + Tcl_SetEnsembleMappingDict(interp, token, mapObj); + Tcl_SetEnsembleParameterList(interp, token, paramObj); + Tcl_SetEnsembleUnknownHandler(interp, token, unknownObj); + Tcl_SetEnsembleFlags(interp, token, flags); + } + return TCL_OK; + + default: + Tcl_Panic("unexpected ensemble command"); + } + return TCL_OK; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_CreateEnsemble -- + * + * Create a simple ensemble attached to the given namespace. + * + * Results: + * The token for the command created. + * + * Side effects: + * The ensemble is created and marked for compilation. + * + *---------------------------------------------------------------------- + */ + +Tcl_Command +Tcl_CreateEnsemble( + Tcl_Interp *interp, + const char *name, + Tcl_Namespace *namespacePtr, + int flags) +{ + Namespace *nsPtr = (Namespace *) namespacePtr; + EnsembleConfig *ensemblePtr = ckalloc(sizeof(EnsembleConfig)); + Tcl_Obj *nameObj = NULL; + + if (nsPtr == NULL) { + nsPtr = (Namespace *) TclGetCurrentNamespace(interp); + } + + /* + * Make the name of the ensemble into a fully qualified name. This might + * allocate a temporary object. + */ + + if (!(name[0] == ':' && name[1] == ':')) { + nameObj = Tcl_NewStringObj(nsPtr->fullName, -1); + if (nsPtr->parentPtr == NULL) { + Tcl_AppendStringsToObj(nameObj, name, NULL); + } else { + Tcl_AppendStringsToObj(nameObj, "::", name, NULL); + } + Tcl_IncrRefCount(nameObj); + name = TclGetString(nameObj); + } + + ensemblePtr->nsPtr = nsPtr; + ensemblePtr->epoch = 0; + Tcl_InitHashTable(&ensemblePtr->subcommandTable, TCL_STRING_KEYS); + ensemblePtr->subcommandArrayPtr = NULL; + ensemblePtr->subcmdList = NULL; + ensemblePtr->subcommandDict = NULL; + ensemblePtr->flags = flags; + ensemblePtr->numParameters = 0; + ensemblePtr->parameterList = NULL; + ensemblePtr->unknownHandler = NULL; + ensemblePtr->token = Tcl_NRCreateCommand(interp, name, + NsEnsembleImplementationCmd, NsEnsembleImplementationCmdNR, + ensemblePtr, DeleteEnsembleConfig); + ensemblePtr->next = (EnsembleConfig *) nsPtr->ensembles; + nsPtr->ensembles = (Tcl_Ensemble *) ensemblePtr; + + /* + * Trigger an eventual recomputation of the ensemble command set. Note + * that this is slightly tricky, as it means that we are not actually + * counting the number of namespace export actions, but it is the simplest + * way to go! + */ + + nsPtr->exportLookupEpoch++; + + if (flags & ENSEMBLE_COMPILE) { + ((Command *) ensemblePtr->token)->compileProc = TclCompileEnsemble; + } + + if (nameObj != NULL) { + TclDecrRefCount(nameObj); + } + return ensemblePtr->token; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_SetEnsembleSubcommandList -- + * + * Set the subcommand list for a particular ensemble. + * + * Results: + * Tcl result code (error if command token does not indicate an ensemble + * or the subcommand list - if non-NULL - is not a list). + * + * Side effects: + * The ensemble is updated and marked for recompilation. + * + *---------------------------------------------------------------------- + */ + +int +Tcl_SetEnsembleSubcommandList( + Tcl_Interp *interp, + Tcl_Command token, + Tcl_Obj *subcmdList) +{ + Command *cmdPtr = (Command *) token; + EnsembleConfig *ensemblePtr; + Tcl_Obj *oldList; + + if (cmdPtr->objProc != NsEnsembleImplementationCmd) { + Tcl_AppendResult(interp, "command is not an ensemble", NULL); + return TCL_ERROR; + } + if (subcmdList != NULL) { + int length; + + if (TclListObjLength(interp, subcmdList, &length) != TCL_OK) { + return TCL_ERROR; + } + if (length < 1) { + subcmdList = NULL; + } + } + + ensemblePtr = cmdPtr->objClientData; + oldList = ensemblePtr->subcmdList; + ensemblePtr->subcmdList = subcmdList; + if (subcmdList != NULL) { + Tcl_IncrRefCount(subcmdList); + } + if (oldList != NULL) { + TclDecrRefCount(oldList); + } + + /* + * Trigger an eventual recomputation of the ensemble command set. Note + * that this is slightly tricky, as it means that we are not actually + * counting the number of namespace export actions, but it is the simplest + * way to go! + */ + + ensemblePtr->nsPtr->exportLookupEpoch++; + + /* + * Special hack to make compiling of [info exists] work when the + * dictionary is modified. + */ + + if (cmdPtr->compileProc != NULL) { + ((Interp *) interp)->compileEpoch++; + } + + return TCL_OK; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_SetEnsembleParameterList -- + * + * Set the parameter list for a particular ensemble. + * + * Results: + * Tcl result code (error if command token does not indicate an ensemble + * or the parameter list - if non-NULL - is not a list). + * + * Side effects: + * The ensemble is updated and marked for recompilation. + * + *---------------------------------------------------------------------- + */ + +int +Tcl_SetEnsembleParameterList( + Tcl_Interp *interp, + Tcl_Command token, + Tcl_Obj *paramList) +{ + Command *cmdPtr = (Command *) token; + EnsembleConfig *ensemblePtr; + Tcl_Obj *oldList; + int length; + + if (cmdPtr->objProc != NsEnsembleImplementationCmd) { + Tcl_AppendResult(interp, "command is not an ensemble", NULL); + return TCL_ERROR; + } + if (paramList == NULL) { + length = 0; + } else { + if (TclListObjLength(interp, paramList, &length) != TCL_OK) { + return TCL_ERROR; + } + if (length < 1) { + paramList = NULL; + } + } + + ensemblePtr = cmdPtr->objClientData; + oldList = ensemblePtr->parameterList; + ensemblePtr->parameterList = paramList; + if (paramList != NULL) { + Tcl_IncrRefCount(paramList); + } + if (oldList != NULL) { + TclDecrRefCount(oldList); + } + ensemblePtr->numParameters = length; + + /* + * Trigger an eventual recomputation of the ensemble command set. Note + * that this is slightly tricky, as it means that we are not actually + * counting the number of namespace export actions, but it is the simplest + * way to go! + */ + + ensemblePtr->nsPtr->exportLookupEpoch++; + + /* + * Special hack to make compiling of [info exists] work when the + * dictionary is modified. + */ + + if (cmdPtr->compileProc != NULL) { + ((Interp *) interp)->compileEpoch++; + } + + return TCL_OK; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_SetEnsembleMappingDict -- + * + * Set the mapping dictionary for a particular ensemble. + * + * Results: + * Tcl result code (error if command token does not indicate an ensemble + * or the mapping - if non-NULL - is not a dict). + * + * Side effects: + * The ensemble is updated and marked for recompilation. + * + *---------------------------------------------------------------------- + */ + +int +Tcl_SetEnsembleMappingDict( + Tcl_Interp *interp, + Tcl_Command token, + Tcl_Obj *mapDict) +{ + Command *cmdPtr = (Command *) token; + EnsembleConfig *ensemblePtr; + Tcl_Obj *oldDict; + + if (cmdPtr->objProc != NsEnsembleImplementationCmd) { + Tcl_AppendResult(interp, "command is not an ensemble", NULL); + return TCL_ERROR; + } + if (mapDict != NULL) { + int size, done; + Tcl_DictSearch search; + Tcl_Obj *valuePtr; + + if (Tcl_DictObjSize(interp, mapDict, &size) != TCL_OK) { + return TCL_ERROR; + } + + for (Tcl_DictObjFirst(NULL, mapDict, &search, NULL, &valuePtr, &done); + !done; Tcl_DictObjNext(&search, NULL, &valuePtr, &done)) { + Tcl_Obj *cmdObjPtr; + const char *bytes; + + if (Tcl_ListObjIndex(interp, valuePtr, 0, &cmdObjPtr) != TCL_OK) { + Tcl_DictObjDone(&search); + return TCL_ERROR; + } + bytes = TclGetString(cmdObjPtr); + if (bytes[0] != ':' || bytes[1] != ':') { + Tcl_AppendResult(interp, + "ensemble target is not a fully-qualified command", + NULL); + Tcl_DictObjDone(&search); + return TCL_ERROR; + } + } + + if (size < 1) { + mapDict = NULL; + } + } + + ensemblePtr = cmdPtr->objClientData; + oldDict = ensemblePtr->subcommandDict; + ensemblePtr->subcommandDict = mapDict; + if (mapDict != NULL) { + Tcl_IncrRefCount(mapDict); + } + if (oldDict != NULL) { + TclDecrRefCount(oldDict); + } + + /* + * Trigger an eventual recomputation of the ensemble command set. Note + * that this is slightly tricky, as it means that we are not actually + * counting the number of namespace export actions, but it is the simplest + * way to go! + */ + + ensemblePtr->nsPtr->exportLookupEpoch++; + + /* + * Special hack to make compiling of [info exists] work when the + * dictionary is modified. + */ + + if (cmdPtr->compileProc != NULL) { + ((Interp *) interp)->compileEpoch++; + } + + return TCL_OK; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_SetEnsembleUnknownHandler -- + * + * Set the unknown handler for a particular ensemble. + * + * Results: + * Tcl result code (error if command token does not indicate an ensemble + * or the unknown handler - if non-NULL - is not a list). + * + * Side effects: + * The ensemble is updated and marked for recompilation. + * + *---------------------------------------------------------------------- + */ + +int +Tcl_SetEnsembleUnknownHandler( + Tcl_Interp *interp, + Tcl_Command token, + Tcl_Obj *unknownList) +{ + Command *cmdPtr = (Command *) token; + EnsembleConfig *ensemblePtr; + Tcl_Obj *oldList; + + if (cmdPtr->objProc != NsEnsembleImplementationCmd) { + Tcl_AppendResult(interp, "command is not an ensemble", NULL); + return TCL_ERROR; + } + if (unknownList != NULL) { + int length; + + if (TclListObjLength(interp, unknownList, &length) != TCL_OK) { + return TCL_ERROR; + } + if (length < 1) { + unknownList = NULL; + } + } + + ensemblePtr = cmdPtr->objClientData; + oldList = ensemblePtr->unknownHandler; + ensemblePtr->unknownHandler = unknownList; + if (unknownList != NULL) { + Tcl_IncrRefCount(unknownList); + } + if (oldList != NULL) { + TclDecrRefCount(oldList); + } + + /* + * Trigger an eventual recomputation of the ensemble command set. Note + * that this is slightly tricky, as it means that we are not actually + * counting the number of namespace export actions, but it is the simplest + * way to go! + */ + + ensemblePtr->nsPtr->exportLookupEpoch++; + + return TCL_OK; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_SetEnsembleFlags -- + * + * Set the flags for a particular ensemble. + * + * Results: + * Tcl result code (error if command token does not indicate an + * ensemble). + * + * Side effects: + * The ensemble is updated and marked for recompilation. + * + *---------------------------------------------------------------------- + */ + +int +Tcl_SetEnsembleFlags( + Tcl_Interp *interp, + Tcl_Command token, + int flags) +{ + Command *cmdPtr = (Command *) token; + EnsembleConfig *ensemblePtr; + int wasCompiled; + + if (cmdPtr->objProc != NsEnsembleImplementationCmd) { + Tcl_AppendResult(interp, "command is not an ensemble", NULL); + return TCL_ERROR; + } + + ensemblePtr = cmdPtr->objClientData; + wasCompiled = ensemblePtr->flags & ENSEMBLE_COMPILE; + + /* + * This API refuses to set the ENSEMBLE_DEAD flag... + */ + + ensemblePtr->flags &= ENSEMBLE_DEAD; + ensemblePtr->flags |= flags & ~ENSEMBLE_DEAD; + + /* + * Trigger an eventual recomputation of the ensemble command set. Note + * that this is slightly tricky, as it means that we are not actually + * counting the number of namespace export actions, but it is the simplest + * way to go! + */ + + ensemblePtr->nsPtr->exportLookupEpoch++; + + /* + * If the ENSEMBLE_COMPILE flag status was changed, install or remove the + * compiler function and bump the interpreter's compilation epoch so that + * bytecode gets regenerated. + */ + + if (flags & ENSEMBLE_COMPILE) { + if (!wasCompiled) { + ((Command*) ensemblePtr->token)->compileProc = TclCompileEnsemble; + ((Interp *) interp)->compileEpoch++; + } + } else { + if (wasCompiled) { + ((Command *) ensemblePtr->token)->compileProc = NULL; + ((Interp *) interp)->compileEpoch++; + } + } + + return TCL_OK; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_GetEnsembleSubcommandList -- + * + * Get the list of subcommands associated with a particular ensemble. + * + * Results: + * Tcl result code (error if command token does not indicate an + * ensemble). The list of subcommands is returned by updating the + * variable pointed to by the last parameter (NULL if this is to be + * derived from the mapping dictionary or the associated namespace's + * exported commands). + * + * Side effects: + * None + * + *---------------------------------------------------------------------- + */ + +int +Tcl_GetEnsembleSubcommandList( + Tcl_Interp *interp, + Tcl_Command token, + Tcl_Obj **subcmdListPtr) +{ + Command *cmdPtr = (Command *) token; + EnsembleConfig *ensemblePtr; + + if (cmdPtr->objProc != NsEnsembleImplementationCmd) { + if (interp != NULL) { + Tcl_AppendResult(interp, "command is not an ensemble", NULL); + } + return TCL_ERROR; + } + + ensemblePtr = cmdPtr->objClientData; + *subcmdListPtr = ensemblePtr->subcmdList; + return TCL_OK; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_GetEnsembleParameterList -- + * + * Get the list of parameters associated with a particular ensemble. + * + * Results: + * Tcl result code (error if command token does not indicate an + * ensemble). The list of parameters is returned by updating the + * variable pointed to by the last parameter (NULL if there are + * no parameters). + * + * Side effects: + * None + * + *---------------------------------------------------------------------- + */ + +int +Tcl_GetEnsembleParameterList( + Tcl_Interp *interp, + Tcl_Command token, + Tcl_Obj **paramListPtr) +{ + Command *cmdPtr = (Command *) token; + EnsembleConfig *ensemblePtr; + + if (cmdPtr->objProc != NsEnsembleImplementationCmd) { + if (interp != NULL) { + Tcl_AppendResult(interp, "command is not an ensemble", NULL); + } + return TCL_ERROR; + } + + ensemblePtr = cmdPtr->objClientData; + *paramListPtr = ensemblePtr->parameterList; + return TCL_OK; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_GetEnsembleMappingDict -- + * + * Get the command mapping dictionary associated with a particular + * ensemble. + * + * Results: + * Tcl result code (error if command token does not indicate an + * ensemble). The mapping dict is returned by updating the variable + * pointed to by the last parameter (NULL if none is installed). + * + * Side effects: + * None + * + *---------------------------------------------------------------------- + */ + +int +Tcl_GetEnsembleMappingDict( + Tcl_Interp *interp, + Tcl_Command token, + Tcl_Obj **mapDictPtr) +{ + Command *cmdPtr = (Command *) token; + EnsembleConfig *ensemblePtr; + + if (cmdPtr->objProc != NsEnsembleImplementationCmd) { + if (interp != NULL) { + Tcl_AppendResult(interp, "command is not an ensemble", NULL); + } + return TCL_ERROR; + } + + ensemblePtr = cmdPtr->objClientData; + *mapDictPtr = ensemblePtr->subcommandDict; + return TCL_OK; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_GetEnsembleUnknownHandler -- + * + * Get the unknown handler associated with a particular ensemble. + * + * Results: + * Tcl result code (error if command token does not indicate an + * ensemble). The unknown handler is returned by updating the variable + * pointed to by the last parameter (NULL if no handler is installed). + * + * Side effects: + * None + * + *---------------------------------------------------------------------- + */ + +int +Tcl_GetEnsembleUnknownHandler( + Tcl_Interp *interp, + Tcl_Command token, + Tcl_Obj **unknownListPtr) +{ + Command *cmdPtr = (Command *) token; + EnsembleConfig *ensemblePtr; + + if (cmdPtr->objProc != NsEnsembleImplementationCmd) { + if (interp != NULL) { + Tcl_AppendResult(interp, "command is not an ensemble", NULL); + } + return TCL_ERROR; + } + + ensemblePtr = cmdPtr->objClientData; + *unknownListPtr = ensemblePtr->unknownHandler; + return TCL_OK; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_GetEnsembleFlags -- + * + * Get the flags for a particular ensemble. + * + * Results: + * Tcl result code (error if command token does not indicate an + * ensemble). The flags are returned by updating the variable pointed to + * by the last parameter. + * + * Side effects: + * None + * + *---------------------------------------------------------------------- + */ + +int +Tcl_GetEnsembleFlags( + Tcl_Interp *interp, + Tcl_Command token, + int *flagsPtr) +{ + Command *cmdPtr = (Command *) token; + EnsembleConfig *ensemblePtr; + + if (cmdPtr->objProc != NsEnsembleImplementationCmd) { + if (interp != NULL) { + Tcl_AppendResult(interp, "command is not an ensemble", NULL); + } + return TCL_ERROR; + } + + ensemblePtr = cmdPtr->objClientData; + *flagsPtr = ensemblePtr->flags; + return TCL_OK; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_GetEnsembleNamespace -- + * + * Get the namespace associated with a particular ensemble. + * + * Results: + * Tcl result code (error if command token does not indicate an + * ensemble). Namespace is returned by updating the variable pointed to + * by the last parameter. + * + * Side effects: + * None + * + *---------------------------------------------------------------------- + */ + +int +Tcl_GetEnsembleNamespace( + Tcl_Interp *interp, + Tcl_Command token, + Tcl_Namespace **namespacePtrPtr) +{ + Command *cmdPtr = (Command *) token; + EnsembleConfig *ensemblePtr; + + if (cmdPtr->objProc != NsEnsembleImplementationCmd) { + if (interp != NULL) { + Tcl_AppendResult(interp, "command is not an ensemble", NULL); + } + return TCL_ERROR; + } + + ensemblePtr = cmdPtr->objClientData; + *namespacePtrPtr = (Tcl_Namespace *) ensemblePtr->nsPtr; + return TCL_OK; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_FindEnsemble -- + * + * Given a command name, get the ensemble token for it, allowing for + * [namespace import]s. [Bug 1017022] + * + * Results: + * The token for the ensemble command with the given name, or NULL if the + * command either does not exist or is not an ensemble (when an error + * message will be written into the interp if thats non-NULL). + * + * Side effects: + * None + * + *---------------------------------------------------------------------- + */ + +Tcl_Command +Tcl_FindEnsemble( + Tcl_Interp *interp, /* Where to do the lookup, and where to write + * the errors if TCL_LEAVE_ERR_MSG is set in + * the flags. */ + Tcl_Obj *cmdNameObj, /* Name of command to look up. */ + int flags) /* Either 0 or TCL_LEAVE_ERR_MSG; other flags + * are probably not useful. */ +{ + Command *cmdPtr; + + cmdPtr = (Command *) + Tcl_FindCommand(interp, TclGetString(cmdNameObj), NULL, flags); + if (cmdPtr == NULL) { + return NULL; + } + + if (cmdPtr->objProc != NsEnsembleImplementationCmd) { + /* + * Reuse existing infrastructure for following import link chains + * rather than duplicating it. + */ + + cmdPtr = (Command *) TclGetOriginalCommand((Tcl_Command) cmdPtr); + + if (cmdPtr == NULL || cmdPtr->objProc != NsEnsembleImplementationCmd){ + if (flags & TCL_LEAVE_ERR_MSG) { + Tcl_AppendResult(interp, "\"", TclGetString(cmdNameObj), + "\" is not an ensemble command", NULL); + Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "ENSEMBLE", + TclGetString(cmdNameObj), NULL); + } + return NULL; + } + } + + return (Tcl_Command) cmdPtr; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_IsEnsemble -- + * + * Simple test for ensemble-hood that takes into account imported + * ensemble commands as well. + * + * Results: + * Boolean value + * + * Side effects: + * None + * + *---------------------------------------------------------------------- + */ + +int +Tcl_IsEnsemble( + Tcl_Command token) +{ + Command *cmdPtr = (Command *) token; + + if (cmdPtr->objProc == NsEnsembleImplementationCmd) { + return 1; + } + cmdPtr = (Command *) TclGetOriginalCommand((Tcl_Command) cmdPtr); + if (cmdPtr == NULL || cmdPtr->objProc != NsEnsembleImplementationCmd) { + return 0; + } + return 1; +} + +/* + *---------------------------------------------------------------------- + * + * TclMakeEnsemble -- + * + * Create an ensemble from a table of implementation commands. The + * ensemble will be subject to (limited) compilation if any of the + * implementation commands are compilable. + * + * The 'name' parameter may be a single command name or a list if + * creating an ensemble subcommand (see the binary implementation). + * + * Currently, the TCL_ENSEMBLE_PREFIX ensemble flag is only used on + * top-level ensemble commands. + * + * Results: + * Handle for the new ensemble, or NULL on failure. + * + * Side effects: + * May advance the bytecode compilation epoch. + * + *---------------------------------------------------------------------- + */ + +Tcl_Command +TclMakeEnsemble( + Tcl_Interp *interp, + const char *name, /* The ensemble name (as explained above) */ + const EnsembleImplMap map[]) /* The subcommands to create */ +{ + Tcl_Command ensemble; + Tcl_Namespace *ns; + Tcl_DString buf, hiddenBuf; + const char **nameParts = NULL; + const char *cmdName = NULL; + int i, nameCount = 0, ensembleFlags = 0, hiddenLen; + + /* + * Construct the path for the ensemble namespace and create it. + */ + + Tcl_DStringInit(&buf); + Tcl_DStringInit(&hiddenBuf); + Tcl_DStringAppend(&hiddenBuf, "tcl:", -1); + Tcl_DStringAppend(&hiddenBuf, name, -1); + Tcl_DStringAppend(&hiddenBuf, ":", -1); + hiddenLen = Tcl_DStringLength(&hiddenBuf); + if (name[0] == ':' && name[1] == ':') { + /* + * An absolute name, so use it directly. + */ + + cmdName = name; + Tcl_DStringAppend(&buf, name, -1); + ensembleFlags = TCL_ENSEMBLE_PREFIX; + } else { + /* + * Not an absolute name, so do munging of it. Note that this treats a + * multi-word list differently to a single word. + */ + + Tcl_DStringAppend(&buf, "::tcl", -1); + + if (Tcl_SplitList(NULL, name, &nameCount, &nameParts) != TCL_OK) { + Tcl_Panic("invalid ensemble name '%s'", name); + } + + for (i = 0; i < nameCount; ++i) { + Tcl_DStringAppend(&buf, "::", 2); + Tcl_DStringAppend(&buf, nameParts[i], -1); + } + } + + ns = Tcl_FindNamespace(interp, Tcl_DStringValue(&buf), NULL, + TCL_CREATE_NS_IF_UNKNOWN); + if (!ns) { + Tcl_Panic("unable to find or create %s namespace!", + Tcl_DStringValue(&buf)); + } + + /* + * Create the named ensemble in the correct namespace + */ + + if (cmdName == NULL) { + if (nameCount == 1) { + ensembleFlags = TCL_ENSEMBLE_PREFIX; + cmdName = Tcl_DStringValue(&buf) + 5; + } else { + ns = ns->parentPtr; + cmdName = nameParts[nameCount - 1]; + } + } + ensemble = Tcl_CreateEnsemble(interp, cmdName, ns, ensembleFlags); + + /* + * Create the ensemble mapping dictionary and the ensemble command procs. + */ + + if (ensemble != NULL) { + Tcl_Obj *mapDict, *fromObj, *toObj; + Command *cmdPtr; + + Tcl_DStringAppend(&buf, "::", 2); + TclNewObj(mapDict); + for (i=0 ; map[i].name != NULL ; i++) { + fromObj = Tcl_NewStringObj(map[i].name, -1); + TclNewStringObj(toObj, Tcl_DStringValue(&buf), + Tcl_DStringLength(&buf)); + Tcl_AppendToObj(toObj, map[i].name, -1); + Tcl_DictObjPut(NULL, mapDict, fromObj, toObj); + + if (map[i].proc || map[i].nreProc) { + /* + * If the command is unsafe, hide it when we're in a safe + * interpreter. The code to do this is really hokey! It also + * doesn't work properly yet; this function is always + * currently called before the safe-interp flag is set so the + * Tcl_IsSafe check fails. + */ + + if (map[i].unsafe && Tcl_IsSafe(interp)) { + cmdPtr = (Command *) + Tcl_NRCreateCommand(interp, "___tmp", map[i].proc, + map[i].nreProc, map[i].clientData, NULL); + Tcl_DStringSetLength(&hiddenBuf, hiddenLen); + if (Tcl_HideCommand(interp, "___tmp", + Tcl_DStringAppend(&hiddenBuf, map[i].name, -1))) { + Tcl_Panic("%s", Tcl_GetString(Tcl_GetObjResult(interp))); + } + } else { + /* + * Not hidden, so just create it. Yay! + */ + + cmdPtr = (Command *) + Tcl_NRCreateCommand(interp, TclGetString(toObj), + map[i].proc, map[i].nreProc, map[i].clientData, + NULL); + } + cmdPtr->compileProc = map[i].compileProc; + if (map[i].compileProc != NULL) { + ensembleFlags |= ENSEMBLE_COMPILE; + } + } + } + Tcl_SetEnsembleMappingDict(interp, ensemble, mapDict); + if (ensembleFlags & ENSEMBLE_COMPILE) { + Tcl_SetEnsembleFlags(interp, ensemble, ensembleFlags); + } + } + + Tcl_DStringFree(&buf); + Tcl_DStringFree(&hiddenBuf); + if (nameParts != NULL) { + Tcl_Free((char *) nameParts); + } + return ensemble; +} + +/* + *---------------------------------------------------------------------- + * + * NsEnsembleImplementationCmd -- + * + * Implements an ensemble of commands (being those exported by a + * namespace other than the global namespace) as a command with the same + * (short) name as the namespace in the parent namespace. + * + * Results: + * A standard Tcl result code. Will be TCL_ERROR if the command is not an + * unambiguous prefix of any command exported by the ensemble's + * namespace. + * + * Side effects: + * Depends on the command within the namespace that gets executed. If the + * ensemble itself returns TCL_ERROR, a descriptive error message will be + * placed in the interpreter's result. + * + *---------------------------------------------------------------------- + */ + +static int +NsEnsembleImplementationCmd( + ClientData clientData, + Tcl_Interp *interp, + int objc, + Tcl_Obj *const objv[]) +{ + return Tcl_NRCallObjProc(interp, NsEnsembleImplementationCmdNR, + clientData, objc, objv); +} + +static int +NsEnsembleImplementationCmdNR( + ClientData clientData, + Tcl_Interp *interp, + int objc, + Tcl_Obj *const objv[]) +{ + EnsembleConfig *ensemblePtr = clientData; + /* The ensemble itself. */ + Tcl_Obj *prefixObj; /* An object containing the prefix words of + * the command that implements the + * subcommand. */ + Tcl_HashEntry *hPtr; /* Used for efficient lookup of fully + * specified but not yet cached command + * names. */ + int reparseCount = 0; /* Number of reparses. */ + + /* + * Must recheck objc, since numParameters might have changed. Cf. test + * namespace-53.9. + */ + + restartEnsembleParse: + if (objc < 2 + ensemblePtr->numParameters) { + /* + * We don't have a subcommand argument. Make error message. + */ + + Tcl_DString buf; /* Message being built */ + Tcl_Obj **elemPtrs; /* Parameter names */ + int len; /* Number of parameters to append */ + + Tcl_DStringInit(&buf); + if (ensemblePtr->parameterList == NULL) { + len = 0; + } else if (TclListObjGetElements(NULL, ensemblePtr->parameterList, + &len, &elemPtrs) != TCL_OK) { + Tcl_Panic("List of ensemble parameters is not a list"); + } + for (; len>0; len--,elemPtrs++) { + Tcl_DStringAppend(&buf, Tcl_GetString(*elemPtrs), -1); + Tcl_DStringAppend(&buf, " ", -1); + } + Tcl_DStringAppend(&buf, "subcommand ?arg ...?", -1); + Tcl_WrongNumArgs(interp, 1, objv, Tcl_DStringValue(&buf)); + Tcl_DStringFree(&buf); + + return TCL_ERROR; + } + + if (ensemblePtr->nsPtr->flags & NS_DYING) { + /* + * Don't know how we got here, but make things give up quickly. + */ + + if (!Tcl_InterpDeleted(interp)) { + Tcl_AppendResult(interp, + "ensemble activated for deleted namespace", NULL); + } + return TCL_ERROR; + } + + /* + * Determine if the table of subcommands is right. If so, we can just look + * up in there and go straight to dispatch. + */ + + if (ensemblePtr->epoch == ensemblePtr->nsPtr->exportLookupEpoch) { + /* + * Table of subcommands is still valid; therefore there might be a + * valid cache of discovered information which we can reuse. Do the + * check here, and if we're still valid, we can jump straight to the + * part where we do the invocation of the subcommand. + */ + + if (objv[1+ensemblePtr->numParameters]->typePtr==&tclEnsembleCmdType){ + EnsembleCmdRep *ensembleCmd = objv[1+ensemblePtr->numParameters] + ->internalRep.otherValuePtr; + + if (ensembleCmd->nsPtr == ensemblePtr->nsPtr && + ensembleCmd->epoch == ensemblePtr->epoch && + ensembleCmd->token == ensemblePtr->token) { + prefixObj = ensembleCmd->realPrefixObj; + Tcl_IncrRefCount(prefixObj); + goto runResultingSubcommand; + } + } + } else { + BuildEnsembleConfig(ensemblePtr); + ensemblePtr->epoch = ensemblePtr->nsPtr->exportLookupEpoch; + } + + /* + * Look in the hashtable for the subcommand name; this is the fastest way + * of all if there is no cache in operation. + */ + + hPtr = Tcl_FindHashEntry(&ensemblePtr->subcommandTable, + TclGetString(objv[1 + ensemblePtr->numParameters])); + if (hPtr != NULL) { + char *fullName = Tcl_GetHashKey(&ensemblePtr->subcommandTable, hPtr); + + prefixObj = Tcl_GetHashValue(hPtr); + + /* + * Cache for later in the subcommand object. + */ + + MakeCachedEnsembleCommand(objv[1 + ensemblePtr->numParameters], + ensemblePtr, fullName, prefixObj); + } else if (!(ensemblePtr->flags & TCL_ENSEMBLE_PREFIX)) { + /* + * Could not map, no prefixing, go to unknown/error handling. + */ + + goto unknownOrAmbiguousSubcommand; + } else { + /* + * If we've not already confirmed the command with the hash as part of + * building our export table, we need to scan the sorted array for + * matches. + */ + + const char *subcmdName; /* Name of the subcommand, or unique prefix of + * it (will be an error for a non-unique + * prefix). */ + char *fullName = NULL; /* Full name of the subcommand. */ + int stringLength, i; + int tableLength = ensemblePtr->subcommandTable.numEntries; + + subcmdName = TclGetString(objv[1 + ensemblePtr->numParameters]); + stringLength = objv[1 + ensemblePtr->numParameters]->length; + for (i=0 ; i<tableLength ; i++) { + register int cmp = strncmp(subcmdName, + ensemblePtr->subcommandArrayPtr[i], + (unsigned) stringLength); + + if (cmp == 0) { + if (fullName != NULL) { + /* + * Since there's never the exact-match case to worry about + * (hash search filters this), getting here indicates that + * our subcommand is an ambiguous prefix of (at least) two + * exported subcommands, which is an error case. + */ + + goto unknownOrAmbiguousSubcommand; + } + fullName = ensemblePtr->subcommandArrayPtr[i]; + } else if (cmp < 0) { + /* + * Because we are searching a sorted table, we can now stop + * searching because we have gone past anything that could + * possibly match. + */ + + break; + } + } + if (fullName == NULL) { + /* + * The subcommand is not a prefix of anything, so bail out! + */ + + goto unknownOrAmbiguousSubcommand; + } + hPtr = Tcl_FindHashEntry(&ensemblePtr->subcommandTable, fullName); + if (hPtr == NULL) { + Tcl_Panic("full name %s not found in supposedly synchronized hash", + fullName); + } + prefixObj = Tcl_GetHashValue(hPtr); + + /* + * Cache for later in the subcommand object. + */ + + MakeCachedEnsembleCommand(objv[1 + ensemblePtr->numParameters], + ensemblePtr, fullName, prefixObj); + } + + Tcl_IncrRefCount(prefixObj); + runResultingSubcommand: + + /* + * Do the real work of execution of the subcommand by building an array of + * objects (note that this is potentially not the same length as the + * number of arguments to this ensemble command), populating it and then + * feeding it back through the main command-lookup engine. In theory, we + * could look up the command in the namespace ourselves, as we already + * have the namespace in which it is guaranteed to exist, + * + * ((Q: That's not true if the -map option is used, is it?)) + * + * but we don't do that (the cacheing of the command object used should + * help with that.) + */ + + { + Tcl_Obj **prefixObjv; /* The list of objects to substitute in as the + * target command prefix. */ + Tcl_Obj *copyPtr; /* The actual list of words to dispatch to. + * Will be freed by the dispatch engine. */ + int prefixObjc, copyObjc; + Interp *iPtr = (Interp *) interp; + + /* + * Get the prefix that we're rewriting to. To do this we need to + * ensure that the internal representation of the list does not change + * so that we can safely keep the internal representations of the + * elements in the list. + * + * TODO: Use conventional list operations to make this code sane! + */ + + TclListObjGetElements(NULL, prefixObj, &prefixObjc, &prefixObjv); + + copyObjc = objc - 2 + prefixObjc; + copyPtr = Tcl_NewListObj(copyObjc, NULL); + if (copyObjc > 0) { + register Tcl_Obj **copyObjv; + /* Space used to construct the list of + * arguments to pass to the command that + * implements the ensemble subcommand. */ + register List *listRepPtr = copyPtr->internalRep.twoPtrValue.ptr1; + register int i; + + listRepPtr->elemCount = copyObjc; + copyObjv = &listRepPtr->elements; + memcpy(copyObjv, prefixObjv, sizeof(Tcl_Obj *) * prefixObjc); + memcpy(copyObjv+prefixObjc, objv+1, + sizeof(Tcl_Obj *) * ensemblePtr->numParameters); + memcpy(copyObjv+prefixObjc+ensemblePtr->numParameters, + objv+ensemblePtr->numParameters+2, + sizeof(Tcl_Obj *) * (objc-ensemblePtr->numParameters-2)); + + for (i=0; i < copyObjc; i++) { + Tcl_IncrRefCount(copyObjv[i]); + } + } + TclDecrRefCount(prefixObj); + + /* + * Record what arguments the script sent in so that things like + * Tcl_WrongNumArgs can give the correct error message. Parameters + * count both as inserted and removed arguments. + */ + +#if 0 + if (TclInitRewriteEnsemble(interp, 2 + ensemblePtr->numParameters, prefixObjc + ensemblePtr->numParameters, objv)) { + TclNRAddCallback(interp, TclClearRootEnsemble, NULL, NULL, NULL, NULL); + } +#else + if (iPtr->ensembleRewrite.sourceObjs == NULL) { + iPtr->ensembleRewrite.sourceObjs = objv; + iPtr->ensembleRewrite.numRemovedObjs = + 2 + ensemblePtr->numParameters; + iPtr->ensembleRewrite.numInsertedObjs = + prefixObjc + ensemblePtr->numParameters; + TclNRAddCallback(interp, TclClearRootEnsemble, NULL, NULL, NULL, + NULL); + } else { + register int ni = 2 + ensemblePtr->numParameters + - iPtr->ensembleRewrite.numInsertedObjs; + /* Position in objv of new front of insertion + * relative to old one. */ + if (ni > 0) { + iPtr->ensembleRewrite.numRemovedObjs += ni; + iPtr->ensembleRewrite.numInsertedObjs += prefixObjc-1; + } else { + iPtr->ensembleRewrite.numInsertedObjs += prefixObjc-2; + } + } +#endif + + /* + * Hand off to the target command. + */ + + iPtr->evalFlags |= TCL_EVAL_REDIRECT; + return Tcl_NREvalObj(interp, copyPtr, TCL_EVAL_INVOKE); + } + + unknownOrAmbiguousSubcommand: + /* + * Have not been able to match the subcommand asked for with a real + * subcommand that we export. See whether a handler has been registered + * for dealing with this situation. Will only call (at most) once for any + * particular ensemble invocation. + */ + + if (ensemblePtr->unknownHandler != NULL && reparseCount++ < 1) { + switch (EnsembleUnknownCallback(interp, ensemblePtr, objc, objv, + &prefixObj)) { + case TCL_OK: + goto runResultingSubcommand; + case TCL_ERROR: + return TCL_ERROR; + case TCL_CONTINUE: + goto restartEnsembleParse; + } + } + + /* + * We cannot determine what subcommand to hand off to, so generate a + * (standard) failure message. Note the one odd case compared with + * standard ensemble-like command, which is where a namespace has no + * exported commands at all... + */ + + Tcl_ResetResult(interp); + Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "ENSEMBLE", + TclGetString(objv[1+ensemblePtr->numParameters]), NULL); + if (ensemblePtr->subcommandTable.numEntries == 0) { + Tcl_AppendResult(interp, "unknown subcommand \"", + TclGetString(objv[1+ensemblePtr->numParameters]), + "\": namespace ", ensemblePtr->nsPtr->fullName, + " does not export any commands", NULL); + Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "SUBCOMMAND", + TclGetString(objv[1+ensemblePtr->numParameters]), NULL); + return TCL_ERROR; + } + Tcl_AppendResult(interp, "unknown ", + (ensemblePtr->flags & TCL_ENSEMBLE_PREFIX ? "or ambiguous " : ""), + "subcommand \"", TclGetString(objv[1+ensemblePtr->numParameters]), + "\": must be ", NULL); + if (ensemblePtr->subcommandTable.numEntries == 1) { + Tcl_AppendResult(interp, ensemblePtr->subcommandArrayPtr[0], NULL); + } else { + int i; + + for (i=0 ; i<ensemblePtr->subcommandTable.numEntries-1 ; i++) { + Tcl_AppendResult(interp, + ensemblePtr->subcommandArrayPtr[i], ", ", NULL); + } + Tcl_AppendResult(interp, "or ", + ensemblePtr->subcommandArrayPtr[i], NULL); + } + Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "SUBCOMMAND", + TclGetString(objv[1+ensemblePtr->numParameters]), NULL); + return TCL_ERROR; +} + +int +TclClearRootEnsemble( + ClientData data[], + Tcl_Interp *interp, + int result) +{ + TclResetRewriteEnsemble(interp, 1); + return result; +} + +/* + *---------------------------------------------------------------------- + * + * TclInitRewriteEnsemble -- + * + * Applies a rewrite of arguments so that an ensemble subcommand will + * report error messages correctly for the overall command. + * + * Results: + * Whether this is the first rewrite applied, a value which must be + * passed to TclResetRewriteEnsemble when undoing this command's + * behaviour. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +int +TclInitRewriteEnsemble( + Tcl_Interp *interp, + int numRemoved, + int numInserted, + Tcl_Obj *const *objv) +{ + Interp *iPtr = (Interp *) interp; + + int isRootEnsemble = (iPtr->ensembleRewrite.sourceObjs == NULL); + + if (isRootEnsemble) { + iPtr->ensembleRewrite.sourceObjs = objv; + iPtr->ensembleRewrite.numRemovedObjs = numRemoved; + iPtr->ensembleRewrite.numInsertedObjs = numInserted; + } else { + int numIns = iPtr->ensembleRewrite.numInsertedObjs; + + if (numIns < numRemoved) { + iPtr->ensembleRewrite.numRemovedObjs += numRemoved - numIns; + iPtr->ensembleRewrite.numInsertedObjs += numInserted - 1; + } else { + iPtr->ensembleRewrite.numInsertedObjs += numInserted - numRemoved; + } + } + return isRootEnsemble; +} + +/* + *---------------------------------------------------------------------- + * + * TclResetRewriteEnsemble -- + * + * Removes any rewrites applied to support proper reporting of error + * messages used in ensembles. Should be paired with + * TclInitRewriteEnsemble. + * + * Results: + * None. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +void +TclResetRewriteEnsemble( + Tcl_Interp *interp, + int isRootEnsemble) +{ + Interp *iPtr = (Interp *) interp; + + if (isRootEnsemble) { + iPtr->ensembleRewrite.sourceObjs = NULL; + iPtr->ensembleRewrite.numRemovedObjs = 0; + iPtr->ensembleRewrite.numInsertedObjs = 0; + } +} + +/* + * ---------------------------------------------------------------------- + * + * EnsmebleUnknownCallback -- + * + * Helper for the ensemble engine that handles the procesing of unknown + * callbacks. See the user documentation of the ensemble unknown handler + * for details; this function is only ever called when such a function is + * defined, and is only ever called once per ensemble dispatch (i.e. if a + * reparse still fails, this isn't called again). + * + * Results: + * TCL_OK - *prefixObjPtr contains the command words to dispatch + * to. + * TCL_CONTINUE - Need to reparse (*prefixObjPtr is invalid). + * TCL_ERROR - Something went wrong! Error message in interpreter. + * + * Side effects: + * Calls the Tcl interpreter, so arbitrary. + * + * ---------------------------------------------------------------------- + */ + +static inline int +EnsembleUnknownCallback( + Tcl_Interp *interp, + EnsembleConfig *ensemblePtr, + int objc, + Tcl_Obj *const objv[], + Tcl_Obj **prefixObjPtr) +{ + int paramc, i, result, prefixObjc; + Tcl_Obj **paramv, *unknownCmd, *ensObj; + char buf[TCL_INTEGER_SPACE]; + + /* + * Create the unknown command callback to determine what to do. + */ + + unknownCmd = Tcl_DuplicateObj(ensemblePtr->unknownHandler); + TclNewObj(ensObj); + Tcl_GetCommandFullName(interp, ensemblePtr->token, ensObj); + Tcl_ListObjAppendElement(NULL, unknownCmd, ensObj); + for (i=1 ; i<objc ; i++) { + Tcl_ListObjAppendElement(NULL, unknownCmd, objv[i]); + } + TclListObjGetElements(NULL, unknownCmd, ¶mc, ¶mv); + Tcl_IncrRefCount(unknownCmd); + + /* + * Now call the unknown handler. (We don't bother NRE-enabling this; deep + * recursing through unknown handlers is horribly perverse.) Note that it + * is always an error for an unknown handler to delete its ensemble; don't + * do that! + */ + + Tcl_Preserve(ensemblePtr); + ((Interp *) interp)->evalFlags |= TCL_EVAL_REDIRECT; + result = Tcl_EvalObjv(interp, paramc, paramv, 0); + if ((result == TCL_OK) && (ensemblePtr->flags & ENSEMBLE_DEAD)) { + Tcl_SetResult(interp, + "unknown subcommand handler deleted its ensemble", + TCL_STATIC); + result = TCL_ERROR; + } + Tcl_Release(ensemblePtr); + + /* + * If we succeeded, we should either have a list of words that form the + * command to be executed, or an empty list. In the empty-list case, the + * ensemble is believed to be updated so we should ask the ensemble engine + * to reparse the original command. + */ + + if (result == TCL_OK) { + *prefixObjPtr = Tcl_GetObjResult(interp); + Tcl_IncrRefCount(*prefixObjPtr); + TclDecrRefCount(unknownCmd); + Tcl_ResetResult(interp); + + /* + * Namespace is still there. Check if the result is a valid list. If + * it is, and it is non-empty, that list is what we are using as our + * replacement. + */ + + if (TclListObjLength(interp, *prefixObjPtr, &prefixObjc) != TCL_OK) { + TclDecrRefCount(*prefixObjPtr); + Tcl_AddErrorInfo(interp, "\n while parsing result of " + "ensemble unknown subcommand handler"); + return TCL_ERROR; + } + if (prefixObjc > 0) { + return TCL_OK; + } + + /* + * Namespace alive & empty result => reparse. + */ + + TclDecrRefCount(*prefixObjPtr); + return TCL_CONTINUE; + } + + /* + * Oh no! An exceptional result. Convert to an error. + */ + + if (!Tcl_InterpDeleted(interp)) { + if (result != TCL_ERROR) { + Tcl_ResetResult(interp); + Tcl_SetResult(interp, + "unknown subcommand handler returned bad code: ", + TCL_STATIC); + switch (result) { + case TCL_RETURN: + Tcl_AppendResult(interp, "return", NULL); + break; + case TCL_BREAK: + Tcl_AppendResult(interp, "break", NULL); + break; + case TCL_CONTINUE: + Tcl_AppendResult(interp, "continue", NULL); + break; + default: + sprintf(buf, "%d", result); + Tcl_AppendResult(interp, buf, NULL); + } + Tcl_AddErrorInfo(interp, "\n result of " + "ensemble unknown subcommand handler: "); + Tcl_AddErrorInfo(interp, TclGetString(unknownCmd)); + } else { + Tcl_AddErrorInfo(interp, + "\n (ensemble unknown subcommand handler)"); + } + } + TclDecrRefCount(unknownCmd); + return TCL_ERROR; +} + +/* + *---------------------------------------------------------------------- + * + * MakeCachedEnsembleCommand -- + * + * Cache what we've computed so far; it's not nice to repeatedly copy + * strings about. Note that to do this, we start by deleting any old + * representation that there was (though if it was an out of date + * ensemble rep, we can skip some of the deallocation process.) + * + * Results: + * None + * + * Side effects: + * Alters the internal representation of the first object parameter. + * + *---------------------------------------------------------------------- + */ + +static void +MakeCachedEnsembleCommand( + Tcl_Obj *objPtr, + EnsembleConfig *ensemblePtr, + const char *subcommandName, + Tcl_Obj *prefixObjPtr) +{ + register EnsembleCmdRep *ensembleCmd; + int length; + + if (objPtr->typePtr == &tclEnsembleCmdType) { + ensembleCmd = objPtr->internalRep.otherValuePtr; + Tcl_DecrRefCount(ensembleCmd->realPrefixObj); + TclNsDecrRefCount(ensembleCmd->nsPtr); + ckfree(ensembleCmd->fullSubcmdName); + } else { + /* + * Kill the old internal rep, and replace it with a brand new one of + * our own. + */ + + TclFreeIntRep(objPtr); + ensembleCmd = ckalloc(sizeof(EnsembleCmdRep)); + objPtr->internalRep.otherValuePtr = ensembleCmd; + objPtr->typePtr = &tclEnsembleCmdType; + } + + /* + * Populate the internal rep. + */ + + ensembleCmd->nsPtr = ensemblePtr->nsPtr; + ensembleCmd->epoch = ensemblePtr->epoch; + ensembleCmd->token = ensemblePtr->token; + ensemblePtr->nsPtr->refCount++; + ensembleCmd->realPrefixObj = prefixObjPtr; + length = strlen(subcommandName)+1; + ensembleCmd->fullSubcmdName = ckalloc(length); + memcpy(ensembleCmd->fullSubcmdName, subcommandName, (unsigned) length); + Tcl_IncrRefCount(ensembleCmd->realPrefixObj); +} + +/* + *---------------------------------------------------------------------- + * + * DeleteEnsembleConfig -- + * + * Destroys the data structure used to represent an ensemble. This is + * called when the ensemble's command is deleted (which happens + * automatically if the ensemble's namespace is deleted.) Maintainers + * should note that ensembles should be deleted by deleting their + * commands. + * + * Results: + * None. + * + * Side effects: + * Memory is (eventually) deallocated. + * + *---------------------------------------------------------------------- + */ + +static void +DeleteEnsembleConfig( + ClientData clientData) +{ + EnsembleConfig *ensemblePtr = clientData; + Namespace *nsPtr = ensemblePtr->nsPtr; + Tcl_HashSearch search; + Tcl_HashEntry *hEnt; + + /* + * Unlink from the ensemble chain if it has not been marked as having been + * done already. + */ + + if (ensemblePtr->next != ensemblePtr) { + EnsembleConfig *ensPtr = (EnsembleConfig *) nsPtr->ensembles; + + if (ensPtr == ensemblePtr) { + nsPtr->ensembles = (Tcl_Ensemble *) ensemblePtr->next; + } else { + while (ensPtr != NULL) { + if (ensPtr->next == ensemblePtr) { + ensPtr->next = ensemblePtr->next; + break; + } + ensPtr = ensPtr->next; + } + } + } + + /* + * Mark the namespace as dead so code that uses Tcl_Preserve() can tell + * whether disaster happened anyway. + */ + + ensemblePtr->flags |= ENSEMBLE_DEAD; + + /* + * Kill the pointer-containing fields. + */ + + if (ensemblePtr->subcommandTable.numEntries != 0) { + ckfree(ensemblePtr->subcommandArrayPtr); + } + hEnt = Tcl_FirstHashEntry(&ensemblePtr->subcommandTable, &search); + while (hEnt != NULL) { + Tcl_Obj *prefixObj = Tcl_GetHashValue(hEnt); + + Tcl_DecrRefCount(prefixObj); + hEnt = Tcl_NextHashEntry(&search); + } + Tcl_DeleteHashTable(&ensemblePtr->subcommandTable); + if (ensemblePtr->subcmdList != NULL) { + Tcl_DecrRefCount(ensemblePtr->subcmdList); + } + if (ensemblePtr->parameterList != NULL) { + Tcl_DecrRefCount(ensemblePtr->parameterList); + } + if (ensemblePtr->subcommandDict != NULL) { + Tcl_DecrRefCount(ensemblePtr->subcommandDict); + } + if (ensemblePtr->unknownHandler != NULL) { + Tcl_DecrRefCount(ensemblePtr->unknownHandler); + } + + /* + * Arrange for the structure to be reclaimed. Note that this is complex + * because we have to make sure that we can react sensibly when an + * ensemble is deleted during the process of initialising the ensemble + * (especially the unknown callback.) + */ + + Tcl_EventuallyFree(ensemblePtr, TCL_DYNAMIC); +} + +/* + *---------------------------------------------------------------------- + * + * BuildEnsembleConfig -- + * + * Create the internal data structures that describe how an ensemble + * looks, being a hash mapping from the full command name to the Tcl list + * that describes the implementation prefix words, and a sorted array of + * all the full command names to allow for reasonably efficient + * unambiguous prefix handling. + * + * Results: + * None. + * + * Side effects: + * Reallocates and rebuilds the hash table and array stored at the + * ensemblePtr argument. For large ensembles or large namespaces, this is + * a potentially expensive operation. + * + *---------------------------------------------------------------------- + */ + +static void +BuildEnsembleConfig( + EnsembleConfig *ensemblePtr) +{ + Tcl_HashSearch search; /* Used for scanning the set of commands in + * the namespace that backs up this + * ensemble. */ + int i, j, isNew; + Tcl_HashTable *hash = &ensemblePtr->subcommandTable; + Tcl_HashEntry *hPtr; + + if (hash->numEntries != 0) { + /* + * Remove pre-existing table. + */ + + ckfree(ensemblePtr->subcommandArrayPtr); + hPtr = Tcl_FirstHashEntry(hash, &search); + while (hPtr != NULL) { + Tcl_Obj *prefixObj = Tcl_GetHashValue(hPtr); + + Tcl_DecrRefCount(prefixObj); + hPtr = Tcl_NextHashEntry(&search); + } + Tcl_DeleteHashTable(hash); + Tcl_InitHashTable(hash, TCL_STRING_KEYS); + } + + /* + * See if we've got an export list. If so, we will only export exactly + * those commands, which may be either implemented by the prefix in the + * subcommandDict or mapped directly onto the namespace's commands. + */ + + if (ensemblePtr->subcmdList != NULL) { + Tcl_Obj **subcmdv, *target, *cmdObj, *cmdPrefixObj; + int subcmdc; + + TclListObjGetElements(NULL, ensemblePtr->subcmdList, &subcmdc, + &subcmdv); + for (i=0 ; i<subcmdc ; i++) { + const char *name = TclGetString(subcmdv[i]); + + hPtr = Tcl_CreateHashEntry(hash, name, &isNew); + + /* + * Skip non-unique cases. + */ + + if (!isNew) { + continue; + } + + /* + * Look in our dictionary (if present) for the command. + */ + + if (ensemblePtr->subcommandDict != NULL) { + Tcl_DictObjGet(NULL, ensemblePtr->subcommandDict, subcmdv[i], + &target); + if (target != NULL) { + Tcl_SetHashValue(hPtr, target); + Tcl_IncrRefCount(target); + continue; + } + } + + /* + * Not there, so map onto the namespace. Note in this case that we + * do not guarantee that the command is actually there; that is + * the programmer's responsibility (or [::unknown] of course). + */ + + cmdObj = Tcl_NewStringObj(ensemblePtr->nsPtr->fullName, -1); + if (ensemblePtr->nsPtr->parentPtr != NULL) { + Tcl_AppendStringsToObj(cmdObj, "::", name, NULL); + } else { + Tcl_AppendStringsToObj(cmdObj, name, NULL); + } + cmdPrefixObj = Tcl_NewListObj(1, &cmdObj); + Tcl_SetHashValue(hPtr, cmdPrefixObj); + Tcl_IncrRefCount(cmdPrefixObj); + } + } else if (ensemblePtr->subcommandDict != NULL) { + /* + * No subcmd list, but we do have a mapping dictionary so we should + * use the keys of that. Convert the dictionary's contents into the + * form required for the ensemble's internal hashtable. + */ + + Tcl_DictSearch dictSearch; + Tcl_Obj *keyObj, *valueObj; + int done; + + Tcl_DictObjFirst(NULL, ensemblePtr->subcommandDict, &dictSearch, + &keyObj, &valueObj, &done); + while (!done) { + const char *name = TclGetString(keyObj); + + hPtr = Tcl_CreateHashEntry(hash, name, &isNew); + Tcl_SetHashValue(hPtr, valueObj); + Tcl_IncrRefCount(valueObj); + Tcl_DictObjNext(&dictSearch, &keyObj, &valueObj, &done); + } + } else { + /* + * Discover what commands are actually exported by the namespace. + * What we have is an array of patterns and a hash table whose keys + * are the command names exported by the namespace (the contents do + * not matter here.) We must find out what commands are actually + * exported by filtering each command in the namespace against each of + * the patterns in the export list. Note that we use an intermediate + * hash table to make memory management easier, and because that makes + * exact matching far easier too. + * + * Suggestion for future enhancement: compute the unique prefixes and + * place them in the hash too, which should make for even faster + * matching. + */ + + hPtr = Tcl_FirstHashEntry(&ensemblePtr->nsPtr->cmdTable, &search); + for (; hPtr!= NULL ; hPtr=Tcl_NextHashEntry(&search)) { + char *nsCmdName = /* Name of command in namespace. */ + Tcl_GetHashKey(&ensemblePtr->nsPtr->cmdTable, hPtr); + + for (i=0 ; i<ensemblePtr->nsPtr->numExportPatterns ; i++) { + if (Tcl_StringMatch(nsCmdName, + ensemblePtr->nsPtr->exportArrayPtr[i])) { + hPtr = Tcl_CreateHashEntry(hash, nsCmdName, &isNew); + + /* + * Remember, hash entries have a full reference to the + * substituted part of the command (as a list) as their + * content! + */ + + if (isNew) { + Tcl_Obj *cmdObj, *cmdPrefixObj; + + TclNewObj(cmdObj); + Tcl_AppendStringsToObj(cmdObj, + ensemblePtr->nsPtr->fullName, + (ensemblePtr->nsPtr->parentPtr ? "::" : ""), + nsCmdName, NULL); + cmdPrefixObj = Tcl_NewListObj(1, &cmdObj); + Tcl_SetHashValue(hPtr, cmdPrefixObj); + Tcl_IncrRefCount(cmdPrefixObj); + } + break; + } + } + } + } + + if (hash->numEntries == 0) { + ensemblePtr->subcommandArrayPtr = NULL; + return; + } + + /* + * Create a sorted array of all subcommands in the ensemble; hash tables + * are all very well for a quick look for an exact match, but they can't + * determine things like whether a string is a prefix of another (not + * without lots of preparation anyway) and they're no good for when we're + * generating the error message either. + * + * We do this by filling an array with the names (we use the hash keys + * directly to save a copy, since any time we change the array we change + * the hash too, and vice versa) and running quicksort over the array. + */ + + ensemblePtr->subcommandArrayPtr = + ckalloc(sizeof(char *) * hash->numEntries); + + /* + * Fill array from both ends as this makes us less likely to end up with + * performance problems in qsort(), which is good. Note that doing this + * makes this code much more opaque, but the naive alternatve: + * + * for (hPtr=Tcl_FirstHashEntry(hash,&search),i=0 ; + * hPtr!=NULL ; hPtr=Tcl_NextHashEntry(&search),i++) { + * ensemblePtr->subcommandArrayPtr[i] = Tcl_GetHashKey(hash, &hPtr); + * } + * + * can produce long runs of precisely ordered table entries when the + * commands in the namespace are declared in a sorted fashion (an ordering + * some people like) and the hashing functions (or the command names + * themselves) are fairly unfortunate. By filling from both ends, it + * requires active malice (and probably a debugger) to get qsort() to have + * awful runtime behaviour. + */ + + i = 0; + j = hash->numEntries; + hPtr = Tcl_FirstHashEntry(hash, &search); + while (hPtr != NULL) { + ensemblePtr->subcommandArrayPtr[i++] = Tcl_GetHashKey(hash, hPtr); + hPtr = Tcl_NextHashEntry(&search); + if (hPtr == NULL) { + break; + } + ensemblePtr->subcommandArrayPtr[--j] = Tcl_GetHashKey(hash, hPtr); + hPtr = Tcl_NextHashEntry(&search); + } + if (hash->numEntries > 1) { + qsort(ensemblePtr->subcommandArrayPtr, (unsigned) hash->numEntries, + sizeof(char *), NsEnsembleStringOrder); + } +} + +/* + *---------------------------------------------------------------------- + * + * NsEnsembleStringOrder -- + * + * Helper function to compare two pointers to two strings for use with + * qsort(). + * + * Results: + * -1 if the first string is smaller, 1 if the second string is smaller, + * and 0 if they are equal. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +static int +NsEnsembleStringOrder( + const void *strPtr1, + const void *strPtr2) +{ + return strcmp(*(const char **)strPtr1, *(const char **)strPtr2); +} + +/* + *---------------------------------------------------------------------- + * + * FreeEnsembleCmdRep -- + * + * Destroys the internal representation of a Tcl_Obj that has been + * holding information about a command in an ensemble. + * + * Results: + * None. + * + * Side effects: + * Memory is deallocated. If this held the last reference to a + * namespace's main structure, that main structure will also be + * destroyed. + * + *---------------------------------------------------------------------- + */ + +static void +FreeEnsembleCmdRep( + Tcl_Obj *objPtr) +{ + EnsembleCmdRep *ensembleCmd = objPtr->internalRep.otherValuePtr; + + Tcl_DecrRefCount(ensembleCmd->realPrefixObj); + ckfree(ensembleCmd->fullSubcmdName); + TclNsDecrRefCount(ensembleCmd->nsPtr); + ckfree(ensembleCmd); + objPtr->typePtr = NULL; +} + +/* + *---------------------------------------------------------------------- + * + * DupEnsembleCmdRep -- + * + * Makes one Tcl_Obj into a copy of another that is a subcommand of an + * ensemble. + * + * Results: + * None. + * + * Side effects: + * Memory is allocated, and the namespace that the ensemble is built on + * top of gains another reference. + * + *---------------------------------------------------------------------- + */ + +static void +DupEnsembleCmdRep( + Tcl_Obj *objPtr, + Tcl_Obj *copyPtr) +{ + EnsembleCmdRep *ensembleCmd = objPtr->internalRep.otherValuePtr; + EnsembleCmdRep *ensembleCopy = ckalloc(sizeof(EnsembleCmdRep)); + int length = strlen(ensembleCmd->fullSubcmdName); + + copyPtr->typePtr = &tclEnsembleCmdType; + copyPtr->internalRep.otherValuePtr = ensembleCopy; + ensembleCopy->nsPtr = ensembleCmd->nsPtr; + ensembleCopy->epoch = ensembleCmd->epoch; + ensembleCopy->token = ensembleCmd->token; + ensembleCopy->nsPtr->refCount++; + ensembleCopy->realPrefixObj = ensembleCmd->realPrefixObj; + Tcl_IncrRefCount(ensembleCopy->realPrefixObj); + ensembleCopy->fullSubcmdName = ckalloc(length + 1); + memcpy(ensembleCopy->fullSubcmdName, ensembleCmd->fullSubcmdName, + (unsigned) length+1); +} + +/* + *---------------------------------------------------------------------- + * + * StringOfEnsembleCmdRep -- + * + * Creates a string representation of a Tcl_Obj that holds a subcommand + * of an ensemble. + * + * Results: + * None. + * + * Side effects: + * The object gains a string (UTF-8) representation. + * + *---------------------------------------------------------------------- + */ + +static void +StringOfEnsembleCmdRep( + Tcl_Obj *objPtr) +{ + EnsembleCmdRep *ensembleCmd = objPtr->internalRep.otherValuePtr; + int length = strlen(ensembleCmd->fullSubcmdName); + + objPtr->length = length; + objPtr->bytes = ckalloc(length + 1); + memcpy(objPtr->bytes, ensembleCmd->fullSubcmdName, (unsigned) length+1); +} + +/* + *---------------------------------------------------------------------- + * + * TclCompileEnsemble -- + * + * Procedure called to compile an ensemble command. Note that most + * ensembles are not compiled, since modifying a compiled ensemble causes + * a invalidation of all existing bytecode (expensive!) which is not + * normally warranted. + * + * Results: + * Returns TCL_OK for a successful compile. Returns TCL_ERROR to defer + * evaluation to runtime. + * + * Side effects: + * Instructions are added to envPtr to execute the subcommands of the + * ensemble at runtime if a compile-time mapping is possible. + * + *---------------------------------------------------------------------- + */ + +int +TclCompileEnsemble( + Tcl_Interp *interp, /* Used for error reporting. */ + Tcl_Parse *parsePtr, /* Points to a parse structure for the command + * created by Tcl_ParseCommand. */ + Command *cmdPtr, /* Points to defintion of command being + * compiled. */ + CompileEnv *envPtr) /* Holds resulting instructions. */ +{ + Tcl_Token *tokenPtr; + Tcl_Obj *mapObj, *subcmdObj, *targetCmdObj, *listObj, **elems; + Tcl_Command ensemble = (Tcl_Command) cmdPtr; + Tcl_Parse synthetic; + int len, result, flags = 0, i; + unsigned numBytes; + const char *word; + + if (parsePtr->numWords < 2) { + return TCL_ERROR; + } + + tokenPtr = TokenAfter(parsePtr->tokenPtr); + if (tokenPtr->type != TCL_TOKEN_SIMPLE_WORD) { + /* + * Too hard. + */ + + return TCL_ERROR; + } + + word = tokenPtr[1].start; + numBytes = tokenPtr[1].size; + + /* + * There's a sporting chance we'll be able to compile this. But now we + * must check properly. To do that, check that we're compiling an ensemble + * that has a compilable command as its appropriate subcommand. + */ + + if (Tcl_GetEnsembleMappingDict(NULL, ensemble, &mapObj) != TCL_OK + || mapObj == NULL) { + /* + * Either not an ensemble or a mapping isn't installed. Crud. Too hard + * to proceed. + */ + + return TCL_ERROR; + } + + /* + * Also refuse to compile anything that uses a formal parameter list for + * now, on the grounds that it is too complex. + */ + + if (Tcl_GetEnsembleParameterList(NULL, ensemble, &listObj) != TCL_OK + || listObj != NULL) { + /* + * Figuring out how to compile this has become too much. Bail out. + */ + + return TCL_ERROR; + } + + /* + * Next, get the flags. We need them on several code paths so that we can + * know whether we're to do prefix matching. + */ + + (void) Tcl_GetEnsembleFlags(NULL, ensemble, &flags); + + /* + * Check to see if there's also a subcommand list; must check to see if + * the subcommand we are calling is in that list if it exists, since that + * list filters the entries in the map. + */ + + (void) Tcl_GetEnsembleSubcommandList(NULL, ensemble, &listObj); + if (listObj != NULL) { + int sclen; + const char *str; + Tcl_Obj *matchObj = NULL; + + if (Tcl_ListObjGetElements(NULL, listObj, &len, &elems) != TCL_OK) { + return TCL_ERROR; + } + for (i=0 ; i<len ; i++) { + str = Tcl_GetStringFromObj(elems[i], &sclen); + if ((sclen == (int) numBytes) && !memcmp(word, str, numBytes)) { + /* + * Exact match! Excellent! + */ + + result = Tcl_DictObjGet(NULL, mapObj,elems[i], &targetCmdObj); + if (result != TCL_OK || targetCmdObj == NULL) { + return TCL_ERROR; + } + goto doneMapLookup; + } + + /* + * Check to see if we've got a prefix match. A single prefix match + * is fine, and allows us to refine our dictionary lookup, but + * multiple prefix matches is a Bad Thing and will prevent us from + * making progress. Note that we cannot do the lookup immediately + * in the prefix case; might be another entry later in the list + * that causes things to fail. + */ + + if ((flags & TCL_ENSEMBLE_PREFIX) + && strncmp(word, str, numBytes) == 0) { + if (matchObj != NULL) { + return TCL_ERROR; + } + matchObj = elems[i]; + } + } + if (matchObj == NULL) { + return TCL_ERROR; + } + result = Tcl_DictObjGet(NULL, mapObj, matchObj, &targetCmdObj); + if (result != TCL_OK || targetCmdObj == NULL) { + return TCL_ERROR; + } + } else { + Tcl_DictSearch s; + int done, matched; + Tcl_Obj *tmpObj; + + /* + * No map, so check the dictionary directly. + */ + + TclNewStringObj(subcmdObj, word, (int) numBytes); + result = Tcl_DictObjGet(NULL, mapObj, subcmdObj, &targetCmdObj); + TclDecrRefCount(subcmdObj); + if (result == TCL_OK && targetCmdObj != NULL) { + /* + * Got it. Skip the fiddling around with prefixes. + */ + + goto doneMapLookup; + } + + /* + * We've not literally got a valid subcommand. But maybe we have a + * prefix. Check if prefix matches are allowed. + */ + + if (!(flags & TCL_ENSEMBLE_PREFIX)) { + return TCL_ERROR; + } + + /* + * Iterate over the keys in the dictionary, checking to see if we're a + * prefix. + */ + + Tcl_DictObjFirst(NULL, mapObj, &s, &subcmdObj, &tmpObj, &done); + matched = 0; + while (!done) { + if (strncmp(TclGetString(subcmdObj), word, numBytes) == 0) { + if (matched++) { + /* + * Must have matched twice! Not unique, so no point + * looking further. + */ + + break; + } + targetCmdObj = tmpObj; + } + Tcl_DictObjNext(&s, &subcmdObj, &tmpObj, &done); + } + Tcl_DictObjDone(&s); + + /* + * If we have anything other than a single match, we've failed the + * unique prefix check. + */ + + if (matched != 1) { + return TCL_ERROR; + } + } + + /* + * OK, we definitely map to something. But what? + * + * The command we map to is the first word out of the map element. Note + * that we also reject dealing with multi-element rewrites if we are in a + * safe interpreter, as there is otherwise a (highly gnarly!) way to make + * Tcl crash open to exploit. + */ + + doneMapLookup: + if (Tcl_ListObjGetElements(NULL, targetCmdObj, &len, &elems) != TCL_OK) { + return TCL_ERROR; + } + if (len > 1 && Tcl_IsSafe(interp)) { + return TCL_ERROR; + } + targetCmdObj = elems[0]; + + Tcl_IncrRefCount(targetCmdObj); + cmdPtr = (Command *) Tcl_GetCommandFromObj(interp, targetCmdObj); + TclDecrRefCount(targetCmdObj); + if (cmdPtr == NULL || cmdPtr->compileProc == NULL + || cmdPtr->flags * CMD_HAS_EXEC_TRACES + || ((Interp *)interp)->flags & DONT_COMPILE_CMDS_INLINE) { + /* + * Maps to an undefined command or a command without a compiler. + * Cannot compile. + */ + + return TCL_ERROR; + } + + /* + * Now we've done the mapping process, can now actually try to compile. + * We do this by handing off to the subcommand's actual compiler. But to + * do that, we have to perform some trickery to rewrite the arguments. + */ + + TclParseInit(interp, NULL, 0, &synthetic); + synthetic.numWords = parsePtr->numWords - 2 + len; + TclGrowParseTokenArray(&synthetic, 2*len); + synthetic.numTokens = 2*len; + + /* + * Now we have the space to work in, install something rewritten. Note + * that we are here praying for all our might that none of these words are + * a script; the error detection code will crash if that happens and there + * is nothing we can do to avoid it! + */ + + for (i=0 ; i<len ; i++) { + int sclen; + const char *str = Tcl_GetStringFromObj(elems[i], &sclen); + + synthetic.tokenPtr[2*i].type = TCL_TOKEN_SIMPLE_WORD; + synthetic.tokenPtr[2*i].start = str; + synthetic.tokenPtr[2*i].size = sclen; + synthetic.tokenPtr[2*i].numComponents = 1; + + synthetic.tokenPtr[2*i+1].type = TCL_TOKEN_TEXT; + synthetic.tokenPtr[2*i+1].start = str; + synthetic.tokenPtr[2*i+1].size = sclen; + synthetic.tokenPtr[2*i+1].numComponents = 0; + } + + /* + * Copy over the real argument tokens. + */ + + for (i=len; i<synthetic.numWords; i++) { + int toCopy; + + tokenPtr = TokenAfter(tokenPtr); + toCopy = tokenPtr->numComponents + 1; + TclGrowParseTokenArray(&synthetic, toCopy); + memcpy(synthetic.tokenPtr + synthetic.numTokens, tokenPtr, + sizeof(Tcl_Token) * toCopy); + synthetic.numTokens += toCopy; + } + + /* + * Hand off compilation to the subcommand compiler. At last! + */ + + result = cmdPtr->compileProc(interp, &synthetic, cmdPtr, envPtr); + + /* + * Clean up if necessary. + */ + + Tcl_FreeParse(&synthetic); + return result; +} + +/* + * Local Variables: + * mode: c + * c-basic-offset: 4 + * fill-column: 78 + * End: + */ |