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-rw-r--r--generic/tclCmdIL.c114
1 files changed, 63 insertions, 51 deletions
diff --git a/generic/tclCmdIL.c b/generic/tclCmdIL.c
index 574dcda..ba64969 100644
--- a/generic/tclCmdIL.c
+++ b/generic/tclCmdIL.c
@@ -16,7 +16,7 @@
* See the file "license.terms" for information on usage and redistribution of
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
- * RCS: @(#) $Id: tclCmdIL.c,v 1.133 2007/12/23 17:52:34 msofer Exp $
+ * RCS: @(#) $Id: tclCmdIL.c,v 1.134 2007/12/25 15:55:23 msofer Exp $
*/
#include "tclInt.h"
@@ -35,8 +35,7 @@ typedef struct SortElement {
double doubleValue;
Tcl_Obj *objValuePtr;
} index;
- Tcl_Obj *objPtr; /* Object being sorted. */
- int count; /* Number of same elements in list. */
+ Tcl_Obj *objPtr; /* Object being sorted, or its index. */
struct SortElement *nextPtr;/* Next element in the list, or NULL for end
* of list. */
} SortElement;
@@ -71,6 +70,8 @@ typedef struct SortInfo {
* supplied. */
int indexc; /* Number of indexes in indexv array. */
int singleIndex; /* Static space for common index case. */
+ int unique;
+ int numElements;
Tcl_Interp *interp; /* The interpreter in which the sort is being
* done. */
int resultCode; /* Completion code for the lsort command. If
@@ -3454,8 +3455,9 @@ Tcl_LsortObjCmd(
sortInfo.sortMode = SORTMODE_ASCII;
sortInfo.indexv = NULL;
sortInfo.indexc = 0;
+ sortInfo.unique = 0;
sortInfo.interp = interp;
- sortInfo.resultCode = TCL_OK;
+ sortInfo.resultCode = TCL_OK;
cmdPtr = NULL;
unique = 0;
indices = 0;
@@ -3555,6 +3557,7 @@ Tcl_LsortObjCmd(
break;
case LSORT_UNIQUE:
unique = 1;
+ sortInfo.unique = 1;
break;
case LSORT_INDICES:
indices = 1;
@@ -3613,7 +3616,8 @@ Tcl_LsortObjCmd(
if (sortInfo.resultCode != TCL_OK || length <= 0) {
goto done;
}
-
+ sortInfo.numElements = length;
+
elementArray = (SortElement *)
TclStackAlloc(interp, length * sizeof(SortElement));
if ((sortInfo.sortMode == SORTMODE_ASCII)
@@ -3629,8 +3633,7 @@ Tcl_LsortObjCmd(
indexPtr = listObjPtrs[i];
}
elementArray[i].index.strValuePtr = TclGetString(indexPtr);
- elementArray[i].objPtr = listObjPtrs[i];
- elementArray[i].count = 0;
+ elementArray[i].objPtr = (indices ? INT2PTR(i) : listObjPtrs[i]);
elementArray[i].nextPtr = &elementArray[i+1];
}
} else if (sortInfo.sortMode == SORTMODE_INTEGER) {
@@ -3649,8 +3652,7 @@ Tcl_LsortObjCmd(
goto done1;
}
elementArray[i].index.intValue = a;
- elementArray[i].objPtr = listObjPtrs[i];
- elementArray[i].count = 0;
+ elementArray[i].objPtr = (indices ? INT2PTR(i) : listObjPtrs[i]);
elementArray[i].nextPtr = &elementArray[i+1];
}
} else if (sortInfo.sortMode == SORTMODE_REAL) {
@@ -3669,8 +3671,7 @@ Tcl_LsortObjCmd(
goto done1;
}
elementArray[i].index.doubleValue = a;
- elementArray[i].objPtr = listObjPtrs[i];
- elementArray[i].count = 0;
+ elementArray[i].objPtr = (indices ? INT2PTR(i) : listObjPtrs[i]);
elementArray[i].nextPtr = &elementArray[i+1];
}
} else {
@@ -3684,8 +3685,7 @@ Tcl_LsortObjCmd(
indexPtr = listObjPtrs[i];
}
elementArray[i].index.objValuePtr = indexPtr;
- elementArray[i].objPtr = listObjPtrs[i];
- elementArray[i].count = 0;
+ elementArray[i].objPtr = (indices ? INT2PTR(i) : listObjPtrs[i]);
elementArray[i].nextPtr = &elementArray[i+1];
}
}
@@ -3697,30 +3697,12 @@ Tcl_LsortObjCmd(
Tcl_Obj **newArray, *objPtr;
int i;
- resultPtr = Tcl_NewListObj(length, NULL);
+ resultPtr = Tcl_NewListObj(sortInfo.numElements, NULL);
listRepPtr = (List *) resultPtr->internalRep.twoPtrValue.ptr1;
newArray = &listRepPtr->elements;
- if (unique) {
- if (indices) {
- for (i = 0; elementPtr != NULL ; elementPtr = elementPtr->nextPtr){
- if (elementPtr->count == 0) {
- objPtr = Tcl_NewIntObj(elementPtr - &elementArray[0]);
- newArray[i++] = objPtr;
- Tcl_IncrRefCount(objPtr);
- }
- }
- } else {
- for (i = 0; elementPtr != NULL ; elementPtr = elementPtr->nextPtr){
- if (elementPtr->count == 0) {
- objPtr = elementPtr->objPtr;
- newArray[i++] = objPtr;
- Tcl_IncrRefCount(objPtr);
- }
- }
- }
- } else if (indices) {
+ if (indices) {
for (i = 0; elementPtr != NULL ; elementPtr = elementPtr->nextPtr){
- objPtr = Tcl_NewIntObj(elementPtr - &elementArray[0]);
+ objPtr = Tcl_NewIntObj(PTR2INT(elementPtr->objPtr));
newArray[i++] = objPtr;
Tcl_IncrRefCount(objPtr);
}
@@ -3818,8 +3800,21 @@ MergeSort(
* The unified list of SortElement structures.
*
* Side effects:
- * None, unless a user-defined comparison command does something weird.
+ * If infoPtr->unique is set then infoPtr->numElements may be updated.
+ * Possibly others, if a user-defined comparison command does something
+ * weird.
*
+ * Note:
+ * If infoPtr->unique is set, the merge assumes that there are no
+ * "repeated" elements in each of the left and right lists. In that case,
+ * if any element of the left list is equivalent to one in the right list
+ * it is omitted from the merged list.
+ * This simplified mechanism works because of the special way
+ * our MergeSort creates the sublists to be merged and will fail to
+ * eliminate all repeats in the general case where they are already
+ * present in either the left or right list. A general code would need to
+ * skip adjacent initial repeats in the left and right lists before
+ * comparing their initial elements, at each step.
*----------------------------------------------------------------------
*/
@@ -3840,30 +3835,47 @@ MergeLists(
return leftPtr;
}
cmp = SortCompare(leftPtr, rightPtr, infoPtr);
- if (cmp > 0) {
+ if (cmp > 0 || (cmp == 0 && infoPtr->unique)) {
+ if (cmp == 0) {
+ infoPtr->numElements--;
+ leftPtr = leftPtr->nextPtr;
+ }
tailPtr = rightPtr;
rightPtr = rightPtr->nextPtr;
} else {
- if (cmp == 0) {
- leftPtr->count++;
- }
tailPtr = leftPtr;
leftPtr = leftPtr->nextPtr;
}
headPtr = tailPtr;
- while ((leftPtr != NULL) && (rightPtr != NULL)) {
- cmp = SortCompare(leftPtr, rightPtr, infoPtr);
- if (cmp > 0) {
- tailPtr->nextPtr = rightPtr;
- tailPtr = rightPtr;
- rightPtr = rightPtr->nextPtr;
- } else {
- if (cmp == 0) {
- leftPtr->count++;
+ if (!infoPtr->unique) {
+ while ((leftPtr != NULL) && (rightPtr != NULL)) {
+ cmp = SortCompare(leftPtr, rightPtr, infoPtr);
+ if (cmp > 0) {
+ tailPtr->nextPtr = rightPtr;
+ tailPtr = rightPtr;
+ rightPtr = rightPtr->nextPtr;
+ } else {
+ tailPtr->nextPtr = leftPtr;
+ tailPtr = leftPtr;
+ leftPtr = leftPtr->nextPtr;
+ }
+ }
+ } else {
+ while ((leftPtr != NULL) && (rightPtr != NULL)) {
+ cmp = SortCompare(leftPtr, rightPtr, infoPtr);
+ if (cmp >= 0) {
+ if (cmp == 0) {
+ infoPtr->numElements--;
+ leftPtr = leftPtr->nextPtr;
+ }
+ tailPtr->nextPtr = rightPtr;
+ tailPtr = rightPtr;
+ rightPtr = rightPtr->nextPtr;
+ } else {
+ tailPtr->nextPtr = leftPtr;
+ tailPtr = leftPtr;
+ leftPtr = leftPtr->nextPtr;
}
- tailPtr->nextPtr = leftPtr;
- tailPtr = leftPtr;
- leftPtr = leftPtr->nextPtr;
}
}
if (leftPtr != NULL) {
generated by cgit v0.12 at 2024-11-05 13:49:38 (GMT)