//need to add an error as a return value b/c xpath evaluation can return error
func (xpath *XPath) Evaluate(nodePtr unsafe.Pointer, xpathExpr *Expression) (nodes []unsafe.Pointer, err error) {
if nodePtr == nil {
//evaluating xpath on a nil node returns no result.
return
}
xpath.ContextPtr.node = (*C.xmlNode)(nodePtr)
if xpath.ResultPtr != nil {
C.xmlXPathFreeObject(xpath.ResultPtr)
}
xpath.ResultPtr = C.xmlXPathCompiledEval(xpathExpr.Ptr, xpath.ContextPtr)
if xpath.ResultPtr == nil {
err = errors.New("err in evaluating xpath: " + xpathExpr.String())
return
}
if nodesetPtr := xpath.ResultPtr.nodesetval; nodesetPtr != nil {
if nodesetSize := int(nodesetPtr.nodeNr); nodesetSize > 0 {
nodes = make([]unsafe.Pointer, nodesetSize)
for i := 0; i < nodesetSize; i++ {
nodes[i] = unsafe.Pointer(C.fetchNode(nodesetPtr, C.int(i)))
}
}
}
return
}
// Evaluate an XPath. The returned result is stored in the struct. Call ReturnType to
// discover the type of result, and call one of the ResultAs* functions to return a
// copy of the result as a particular type.
func (xpath *XPath) Evaluate(nodePtr unsafe.Pointer, xpathExpr *Expression) (err error) {
if nodePtr == nil {
//evaluating xpath on a nil node returns no result.
return
}
oldXPContextDoc := xpath.ContextPtr.doc
oldXPContextNode := xpath.ContextPtr.node
oldXPProximityPosition := xpath.ContextPtr.proximityPosition
oldXPContextSize := xpath.ContextPtr.contextSize
oldXPNsNr := xpath.ContextPtr.nsNr
oldXPNamespaces := xpath.ContextPtr.namespaces
xpath.ContextPtr.node = (*C.xmlNode)(nodePtr)
if xpath.ResultPtr != nil {
C.xmlXPathFreeObject(xpath.ResultPtr)
}
xpath.ResultPtr = C.xmlXPathCompiledEval(xpathExpr.Ptr, xpath.ContextPtr)
xpath.ContextPtr.doc = oldXPContextDoc
xpath.ContextPtr.node = oldXPContextNode
xpath.ContextPtr.proximityPosition = oldXPProximityPosition
xpath.ContextPtr.contextSize = oldXPContextSize
xpath.ContextPtr.nsNr = oldXPNsNr
xpath.ContextPtr.namespaces = oldXPNamespaces
if xpath.ResultPtr == nil {
err = errors.New("err in evaluating xpath: " + xpathExpr.String())
return
}
return
}
func (xpath *XPath) Free() {
if xpath.ContextPtr != nil {
C.xmlXPathFreeContext(xpath.ContextPtr)
xpath.ContextPtr = nil
}
if xpath.ResultPtr != nil {
C.xmlXPathFreeObject(xpath.ResultPtr)
xpath.ResultPtr = nil
}
}
func (xpath *XPath) Free() {
if xpath.ContextPtr != nil {
ClearScope(unsafe.Pointer(xpath.ContextPtr))
C.xmlXPathFreeContext(xpath.ContextPtr)
xpath.ContextPtr = nil
}
if xpath.ResultPtr != nil {
C.xmlXPathFreeObject(xpath.ResultPtr)
xpath.ResultPtr = nil
}
}
// C14n Canonicalise the node using the SAML specified exclusive method
// Very slow on large documents with node != nil
func (xp *Xp) C14n(node *C.xmlNode) string {
var buffer *C.xmlChar
var nodeset *C.xmlNodeSet
if node != nil {
C.xmlXPathSetContextNode(node, xp.xpathCtx)
xpathObj := C.xmlXPathEvalExpression(exclc14nxpath, xp.xpathCtx)
defer C.xmlXPathFreeObject(xpathObj)
nodeset = xpathObj.nodesetval
//fmt.Printf("%+v\n", nodeset)
}
C.xmlC14NDocDumpMemory(xp.doc, nodeset, C.XML_C14N_EXCLUSIVE_1_0, nil, 0, &buffer)
defer C.free(unsafe.Pointer(buffer))
p := (*C.char)(unsafe.Pointer(buffer))
return C.GoString(p)
}
func (xpath *XPath) Evaluate(nodePtr unsafe.Pointer, xpathExpr *Expression) (nodes []unsafe.Pointer) {
if nodePtr == nil {
return
}
xpath.ContextPtr.node = (*C.xmlNode)(nodePtr)
if xpath.ResultPtr != nil {
C.xmlXPathFreeObject(xpath.ResultPtr)
}
xpath.ResultPtr = C.xmlXPathCompiledEval(xpathExpr.Ptr, xpath.ContextPtr)
if nodesetPtr := xpath.ResultPtr.nodesetval; nodesetPtr != nil {
if nodesetSize := int(nodesetPtr.nodeNr); nodesetSize > 0 {
nodes = make([]unsafe.Pointer, nodesetSize)
for i := 0; i < nodesetSize; i++ {
nodes[i] = unsafe.Pointer(C.fetchNode(nodesetPtr, C.int(i)))
}
}
}
return
}
// xmlXPathFreeObject
func (obj *XPathObject) Free() {
C.xmlXPathFreeObject(obj.Ptr)
obj.Ptr = nil
}
func (x *XPathObject) Free() {
// if x.ptr.nodesetval != nil {
// C.xmlXPathFreeNodeSet(x.ptr.nodesetval)
// }
C.xmlXPathFreeObject(x.ptr)
}
