Bug 282777 - Implement index() xpath function. Patch by aaronr@us.ibm.com, r=sicking, beaufour

extensions/transformiix/source/xpath/XFormsFunctionCall.cpp

@@ -181,7 +181,33 @@ XFormsFunctionCall::evaluate(txIEvalContext* aContext, txAExprResult** aResult)
       if (!requireParams(1, 1, aContext))
           return NS_ERROR_XPATH_BAD_ARGUMENT_COUNT;
 
-      return NS_ERROR_NOT_IMPLEMENTED;
+      nsAutoString indexId;
+      evaluateToString((Expr*)iter.next(), aContext, indexId);
+
+      // here document is the XForms document
+      nsCOMPtr<nsIDOMDocument> document;
+      rv = mResolverNode->GetOwnerDocument(getter_AddRefs(document)); 
+      NS_ENSURE_SUCCESS(rv, rv);
+      NS_ENSURE_TRUE(document, NS_ERROR_NULL_POINTER);
+
+      // indexId should be the id of a nsIXFormsRepeatElement
+      nsCOMPtr<nsIDOMElement> repeatEle;
+      rv = document->GetElementById(indexId, getter_AddRefs(repeatEle)); 
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      // now get the index value from the xforms:repeat.  Need to use the
+      //   service to do this work so that we don't have dependencies in
+      //   transformiix on XForms.
+      nsCOMPtr<nsIXFormsUtilityService>xformsService = 
+            do_GetService("@mozilla.org/xforms-utility-service;1", &rv);
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      PRUint32 index;
+      rv = xformsService->GetRepeatIndex(repeatEle, &index);
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      return aContext->recycler()->getNumberResult(index, aResult);
+
     }
     case INSTANCE:
     {

extensions/transformiix/source/xpath/nsIXFormsUtilityService.h

@@ -65,7 +65,8 @@ class nsIXFormsModelElement; /* forward declaration */
   NS_IMETHOD GetModelFromNode(nsIDOMNode *node, nsIDOMNode **_retval); \
   NS_IMETHOD IsNodeAssocWithModel(nsIDOMNode *aNode, nsIDOMNode *aModel, PRBool *_retval); \
   NS_IMETHOD GetInstanceDocumentRoot(const nsAString & aID, nsIDOMNode *aModelNode, nsIDOMNode **_retval); \
-  NS_IMETHOD ValidateString(const nsAString & aValue, const nsAString & aType, const nsAString & aNamespace, PRBool *_retval); 
+  NS_IMETHOD ValidateString(const nsAString & aValue, const nsAString & aType, const nsAString & aNamespace, PRBool *_retval); \
+  NS_IMETHOD GetRepeatIndex(nsIDOMNode *aRepeat, PRUint32 *aIndex);
 
 /**
  * Private interface implemented by the nsXFormsUtilityService in XForms extension.
@@ -116,6 +117,12 @@ class NS_NO_VTABLE nsIXFormsUtilityService : public nsISupports {
   /* boolean validateString (in AString aValue, in AString aType, in AString aNamespace); */
   NS_IMETHOD ValidateString(const nsAString & aValue, const nsAString & aType, const nsAString & aNamespace, PRBool *_retval) = 0;
 
+  /**
+   * Function to retrieve the index from the given repeat element.
+   */
+  /* unsigned long getRepeatIndex (in nsIDOMNode aRepeat); */
+  NS_IMETHOD GetRepeatIndex(nsIDOMNode *aRepeat, PRUint32 *aIndex) = 0;
+
 };
 
 #define NS_ERROR_XFORMS_CALCUATION_EXCEPTION \

extensions/transformiix/source/xpath/nsXFormsXPathEvaluator.cpp

@@ -211,7 +211,9 @@ nsXFormsXPathEvaluator::XFormsParseContextImpl::resolveFunctionCall(
       aFnCall = new XFormsFunctionCall(XFormsFunctionCall::IF);
     }
     else if (aName == txXPathAtoms::index) {
-      aFnCall = new XFormsFunctionCall(XFormsFunctionCall::INDEX); 
+      NS_ENSURE_TRUE(mResolverNode, NS_ERROR_FAILURE);
+      aFnCall = new XFormsFunctionCall(XFormsFunctionCall::INDEX,
+                                       mResolverNode); 
     }
     else if (aName == txXPathAtoms::instance) {
       NS_ENSURE_TRUE(mResolverNode, NS_ERROR_FAILURE);

extensions/xforms/nsXFormsUtilityService.cpp

@@ -46,6 +46,7 @@
 #include "nsIXFormsModelElement.h"
 #include "nsIDOMNodeList.h"
 #include "nsIInstanceElementPrivate.h"
+#include "nsIXFormsRepeatElement.h"
 
 NS_IMPL_ISUPPORTS1(nsXFormsUtilityService, nsIXFormsUtilityService)
 
@@ -223,3 +224,15 @@ nsXFormsUtilityService::ValidateString(const nsAString & aValue,
 
   return NS_ERROR_NOT_IMPLEMENTED;
 }
+
+NS_IMETHODIMP
+nsXFormsUtilityService::GetRepeatIndex(nsIDOMNode *aRepeat, PRUint32 *aIndex)
+{
+  NS_ASSERTION(aIndex, "no return buffer for index, we'll crash soon");
+  *aIndex = 0;
+
+  nsCOMPtr<nsIXFormsRepeatElement> repeatEle = do_QueryInterface(aRepeat);
+  NS_ENSURE_TRUE(repeatEle, NS_ERROR_NULL_POINTER);
+
+  return repeatEle->GetIndex(aIndex);
+}