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-rw-r--r--generic/tclDictObj.c213
1 files changed, 149 insertions, 64 deletions
diff --git a/generic/tclDictObj.c b/generic/tclDictObj.c
index 83fc3a6..5b7ca9b 100644
--- a/generic/tclDictObj.c
+++ b/generic/tclDictObj.c
@@ -103,7 +103,7 @@ static const EnsembleImplMap implementationMap[] = {
{"unset", DictUnsetCmd, NULL, NULL, NULL, 0 },
{"update", DictUpdateCmd, TclCompileDictUpdateCmd, NULL, NULL, 0 },
{"values", DictValuesCmd, NULL, NULL, NULL, 0 },
- {"with", DictWithCmd, NULL, NULL, NULL, 0 },
+ {"with", DictWithCmd, TclCompileDictWithCmd, NULL, NULL, 0 },
{NULL, NULL, NULL, NULL, NULL, 0}
};
@@ -3110,9 +3110,7 @@ DictWithCmd(
Tcl_Obj *const *objv)
{
Interp *iPtr = (Interp *) interp;
- Tcl_Obj *dictPtr, *keysPtr, *keyPtr = NULL, *valPtr = NULL, *pathPtr;
- Tcl_DictSearch s;
- int done;
+ Tcl_Obj *dictPtr, *keysPtr, *pathPtr;
if (objc < 3) {
Tcl_WrongNumArgs(interp, 1, objv, "dictVar ?key ...? script");
@@ -3127,39 +3125,13 @@ DictWithCmd(
if (dictPtr == NULL) {
return TCL_ERROR;
}
- if (objc > 3) {
- dictPtr = TclTraceDictPath(interp, dictPtr, objc-3, objv+2,
- DICT_PATH_READ);
- if (dictPtr == NULL) {
- return TCL_ERROR;
- }
- }
- /*
- * Go over the list of keys and write each corresponding value to a
- * variable in the current context with the same name. Also keep a copy of
- * the keys so we can write back properly later on even if the dictionary
- * has been structurally modified.
- */
-
- if (Tcl_DictObjFirst(interp, dictPtr, &s, &keyPtr, &valPtr,
- &done) != TCL_OK) {
+ keysPtr = TclDictWithInit(interp, dictPtr, objc-3, objv+2);
+ if (keysPtr == NULL) {
return TCL_ERROR;
}
-
- TclNewObj(keysPtr);
Tcl_IncrRefCount(keysPtr);
- for (; !done ; Tcl_DictObjNext(&s, &keyPtr, &valPtr, &done)) {
- Tcl_ListObjAppendElement(NULL, keysPtr, keyPtr);
- if (Tcl_ObjSetVar2(interp, keyPtr, NULL, valPtr,
- TCL_LEAVE_ERR_MSG) == NULL) {
- TclDecrRefCount(keysPtr);
- Tcl_DictObjDone(&s);
- return TCL_ERROR;
- }
- }
-
/*
* Execute the body, while making the invoking context available to the
* loop body (TIP#280) and postponing the cleanup until later (NRE).
@@ -3183,8 +3155,8 @@ FinalizeDictWith(
Tcl_Interp *interp,
int result)
{
- Tcl_Obj **keyv, *leafPtr, *dictPtr, *valPtr;
- int keyc, i, allocdict = 0;
+ Tcl_Obj **pathv;
+ int pathc;
Tcl_InterpState state;
Tcl_Obj *varName = data[0];
Tcl_Obj *keysPtr = data[1];
@@ -3195,43 +3167,163 @@ FinalizeDictWith(
}
/*
+ * Save the result state; TDWF doesn't guarantee to not modify that on
+ * TCL_OK result.
+ */
+
+ state = Tcl_SaveInterpState(interp, result);
+ if (pathPtr != NULL) {
+ Tcl_ListObjGetElements(NULL, pathPtr, &pathc, &pathv);
+ } else {
+ pathc = 0;
+ pathv = NULL;
+ }
+
+ /*
+ * Pack from local variables back into the dictionary.
+ */
+
+ result = TclDictWithFinish(interp, varName, pathc, pathv, keysPtr);
+
+ /*
+ * Tidy up and return the real result (unless we had an error).
+ */
+
+ TclDecrRefCount(varName);
+ TclDecrRefCount(keysPtr);
+ if (pathPtr != NULL) {
+ TclDecrRefCount(pathPtr);
+ }
+ if (result != TCL_OK) {
+ Tcl_DiscardInterpState(state);
+ return TCL_ERROR;
+ }
+ return Tcl_RestoreInterpState(interp, state);
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * TclDictWithInit --
+ *
+ * Part of the core of [dict with]. Pokes into a dictionary and converts
+ * the mappings there into assignments to (presumably) local variables.
+ * Returns a list of all the names that were mapped so that removal of
+ * either the variable or the dictionary entry won't surprise us when we
+ * come to stuffing everything back.
+ *
+ * Result:
+ * List of mapped names, or NULL if there was an error.
+ *
+ * Side effects:
+ * Assigns to variables, so potentially legion due to traces.
+ *
+ *----------------------------------------------------------------------
+ */
+
+Tcl_Obj *
+TclDictWithInit(
+ Tcl_Interp *interp,
+ Tcl_Obj *dictPtr,
+ int pathc,
+ Tcl_Obj *const pathv[])
+{
+ Tcl_DictSearch s;
+ Tcl_Obj *keyPtr, *valPtr, *keysPtr;
+ int done;
+
+ if (pathc > 0) {
+ dictPtr = TclTraceDictPath(interp, dictPtr, pathc, pathv,
+ DICT_PATH_READ);
+ if (dictPtr == NULL) {
+ return NULL;
+ }
+ }
+
+ /*
+ * Go over the list of keys and write each corresponding value to a
+ * variable in the current context with the same name. Also keep a copy of
+ * the keys so we can write back properly later on even if the dictionary
+ * has been structurally modified.
+ */
+
+ if (Tcl_DictObjFirst(interp, dictPtr, &s, &keyPtr, &valPtr,
+ &done) != TCL_OK) {
+ return NULL;
+ }
+
+ TclNewObj(keysPtr);
+
+ for (; !done ; Tcl_DictObjNext(&s, &keyPtr, &valPtr, &done)) {
+ Tcl_ListObjAppendElement(NULL, keysPtr, keyPtr);
+ if (Tcl_ObjSetVar2(interp, keyPtr, NULL, valPtr,
+ TCL_LEAVE_ERR_MSG) == NULL) {
+ TclDecrRefCount(keysPtr);
+ Tcl_DictObjDone(&s);
+ return NULL;
+ }
+ }
+
+ return keysPtr;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * TclDictWithFinish --
+ *
+ * Part of the core of [dict with]. Reassembles the piece of the dict (in
+ * varName, location given by pathc/pathv) from the variables named in
+ * the keysPtr argument. NB, does not try to preserve errors or manage
+ * argument lifetimes.
+ *
+ * Result:
+ * TCL_OK if we succeeded, or TCL_ERROR if we failed.
+ *
+ * Side effects:
+ * Assigns to a variable, so potentially legion due to traces. Updates
+ * the dictionary in the named variable.
+ *
+ *----------------------------------------------------------------------
+ */
+
+int
+TclDictWithFinish(
+ Tcl_Interp *interp,
+ Tcl_Obj *varName,
+ int pathc,
+ Tcl_Obj *const pathv[],
+ Tcl_Obj *keysPtr)
+{
+ Tcl_Obj *dictPtr, *leafPtr, *valPtr;
+ int i, allocdict, keyc;
+ Tcl_Obj **keyv;
+
+ /*
* If the dictionary variable doesn't exist, drop everything silently.
*/
dictPtr = Tcl_ObjGetVar2(interp, varName, NULL, 0);
if (dictPtr == NULL) {
- TclDecrRefCount(varName);
- TclDecrRefCount(keysPtr);
- if (pathPtr) {
- TclDecrRefCount(pathPtr);
- }
- return result;
+ return TCL_OK;
}
/*
* Double-check that it is still a dictionary.
*/
- state = Tcl_SaveInterpState(interp, result);
if (Tcl_DictObjSize(interp, dictPtr, &i) != TCL_OK) {
- TclDecrRefCount(varName);
- TclDecrRefCount(keysPtr);
- if (pathPtr) {
- TclDecrRefCount(pathPtr);
- }
- Tcl_DiscardInterpState(state);
return TCL_ERROR;
}
if (Tcl_IsShared(dictPtr)) {
dictPtr = Tcl_DuplicateObj(dictPtr);
allocdict = 1;
+ } else {
+ allocdict = 0;
}
- if (pathPtr != NULL) {
- Tcl_Obj **pathv;
- int pathc;
-
+ if (pathc > 0) {
/*
* Want to get to the dictionary which we will update; need to do
* prepare-for-update de-sharing along the path *but* avoid generating
@@ -3241,26 +3333,19 @@ FinalizeDictWith(
* perfectly efficient (but no memory should be leaked).
*/
- Tcl_ListObjGetElements(NULL, pathPtr, &pathc, &pathv);
leafPtr = TclTraceDictPath(interp, dictPtr, pathc, pathv,
DICT_PATH_EXISTS | DICT_PATH_UPDATE);
- TclDecrRefCount(pathPtr);
if (leafPtr == NULL) {
- TclDecrRefCount(varName);
- TclDecrRefCount(keysPtr);
if (allocdict) {
TclDecrRefCount(dictPtr);
}
- Tcl_DiscardInterpState(state);
return TCL_ERROR;
}
if (leafPtr == DICT_PATH_NON_EXISTENT) {
- TclDecrRefCount(varName);
- TclDecrRefCount(keysPtr);
if (allocdict) {
TclDecrRefCount(dictPtr);
}
- return Tcl_RestoreInterpState(interp, state);
+ return TCL_OK;
}
} else {
leafPtr = dictPtr;
@@ -3286,14 +3371,13 @@ FinalizeDictWith(
Tcl_DictObjPut(NULL, leafPtr, keyv[i], valPtr);
}
}
- TclDecrRefCount(keysPtr);
/*
* Ensure that none of the dictionaries in the chain still have a string
* rep.
*/
- if (pathPtr != NULL) {
+ if (pathc > 0) {
InvalidateDictChain(leafPtr);
}
@@ -3303,11 +3387,12 @@ FinalizeDictWith(
if (Tcl_ObjSetVar2(interp, varName, NULL, dictPtr,
TCL_LEAVE_ERR_MSG) == NULL) {
- Tcl_DiscardInterpState(state);
+ if (allocdict) {
+ TclDecrRefCount(dictPtr);
+ }
return TCL_ERROR;
}
- TclDecrRefCount(varName);
- return Tcl_RestoreInterpState(interp, state);
+ return TCL_OK;
}
/*
generated by cgit v0.12 at 2024-11-19 18:55:23 (GMT)