fixing yet another pattern induced XPath bug #314282 reverted back last

* pattern.c xpath.c include/libxml/pattern.h: fixing yet another
  pattern induced XPath bug #314282
* relaxng.c: reverted back last change it was seriously broken
Daniel

ChangeLog

@@ -1,3 +1,9 @@
+Sun Sep  4 14:01:00 CEST 2005 Daniel Veillard <daniel@veillard.com>
+
+	* pattern.c xpath.c include/libxml/pattern.h: fixing yet another
+	  pattern induced XPath bug #314282
+	* relaxng.c: reverted back last change it was seriously broken
+
 Sat Sep  3 16:51:55 CEST 2005 Rob Richards <rrichards@ctindustries.net>
 
 	* xmlsave.c: check for NULL to prevent crash with meta elements

include/libxml/pattern.h

@@ -66,6 +66,8 @@ XMLPUBFUN int XMLCALL
 			xmlPatternStreamable	(xmlPatternPtr comp);
 XMLPUBFUN int XMLCALL
 			xmlPatternMaxDepth	(xmlPatternPtr comp);
+XMLPUBFUN int XMLCALL
+			xmlPatternMinDepth	(xmlPatternPtr comp);
 XMLPUBFUN int XMLCALL
 			xmlPatternFromRoot	(xmlPatternPtr comp);
 XMLPUBFUN xmlStreamCtxtPtr XMLCALL

pattern.c

@@ -1634,6 +1634,14 @@ xmlStreamPushInternal(xmlStreamCtxtPtr stream,
 	* Fast check for ".".
 	*/
 	if (comp->nbStep == 0) {
+	    /*
+	     * / and . are handled at the XPath node set creation
+	     * level by checking min depth
+	     */
+	    if (stream->flags & XML_PATTERN_XPATH) {
+		stream = stream->next;
+		continue; /* while */
+	    }
 	    /*
 	    * For non-pattern like evaluation like XML Schema IDCs
 	    * or traditional XPath expressions, this will match if
@@ -2157,7 +2165,33 @@ xmlPatternMaxDepth(xmlPatternPtr comp) {
 	comp = comp->next;
     }
     return(ret);
+}
 
+/**
+ * xmlPatternMinDepth:
+ * @comp: the precompiled pattern
+ *
+ * Check the minimum depth reachable by a pattern, 0 mean the / or . are
+ * part of the set.
+ *
+ * Returns -1 in case of error otherwise the depth,
+ *         
+ */
+int
+xmlPatternMinDepth(xmlPatternPtr comp) {
+    int ret = 12345678;
+    if (comp == NULL)
+        return(-1);
+    while (comp != NULL) {
+        if (comp->stream == NULL)
+	    return(-1);
+	if (comp->stream->nbStep < ret)
+	    ret = comp->stream->nbStep;
+	if (ret == 0)
+	    return(0);
+	comp = comp->next;
+    }
+    return(ret);
 }
 
 /**

relaxng.c

@@ -2220,6 +2220,9 @@ xmlRelaxNGShowValidError(xmlRelaxNGValidCtxtPtr ctxt,
 {
     xmlChar *msg;
 
+    if (ctxt->error == NULL)
+        return;
+
 #ifdef DEBUG_ERROR
     xmlGenericError(xmlGenericErrorContext, "Show error %d\n", err);
 #endif
@@ -2329,7 +2332,7 @@ xmlRelaxNGAddValidError(xmlRelaxNGValidCtxtPtr ctxt,
                         xmlRelaxNGValidErr err, const xmlChar * arg1,
                         const xmlChar * arg2, int dup)
 {
-    if (ctxt == NULL)
+    if ((ctxt == NULL) || (ctxt->error == NULL))
         return;
 
 #ifdef DEBUG_ERROR

xpath.c

@@ -11003,7 +11003,7 @@ xmlXPathCompOpEval(xmlXPathParserContextPtr ctxt, xmlXPathStepOpPtr op)
  */
 static xmlXPathObjectPtr
 xmlXPathRunStreamEval(xmlXPathContextPtr ctxt, xmlPatternPtr comp) {
-    int max_depth;
+    int max_depth, min_depth;
     int from_root;
     int ret, depth;
     xmlNodePtr cur = NULL, limit = NULL;
@@ -11019,6 +11019,9 @@ xmlXPathRunStreamEval(xmlXPathContextPtr ctxt, xmlPatternPtr comp) {
         return(NULL);
     if (max_depth == -2)
         max_depth = 10000;
+    min_depth = xmlPatternMinDepth(comp);
+    if (min_depth == -1)
+        return(NULL);
     from_root = xmlPatternFromRoot(comp);
     if (from_root < 0)
         return(NULL);
@@ -11030,13 +11033,20 @@ xmlXPathRunStreamEval(xmlXPathContextPtr ctxt, xmlPatternPtr comp) {
     if (retval == NULL)
         return(NULL);
     
-    if ((from_root) && (max_depth == 0)) {
+    /*
+     * handle the special cases of / amd . being matched
+     */
+    if (min_depth == 0) {
+	if (from_root) {
 	    xmlXPathNodeSetAddUnique(retval->nodesetval, (xmlNodePtr) ctxt->doc);
-	return(retval);
+	} else {
-    } else if (max_depth == 0) {
 	    xmlXPathNodeSetAddUnique(retval->nodesetval, ctxt->node);
+	}
+    }
+    if (max_depth == 0) {
 	return(retval);
     }
+
     if (from_root) {
         cur = (xmlNodePtr)ctxt->doc;
     } else if (ctxt->node != NULL) {