common.go

package goxml

/*
// #cgo pkg-config: libxml-2.0
// #include <libxml/tree.h>


import "C"
import "unsafe"
import "fmt"
import "os"
*/

/*
	High Level Interface functions
*/

func HtmlExtractXpathNodes(buffer []byte, xpathExpr string, baseUrl string) (ret []*XmlNode, err error) {
	data := string(buffer)
	ctxt, err := HtmlCreateMemoryParserCtxt(data)
	if err != nil {
		return
	}
	defer HtmlFreeParserCtxt(ctxt)

	doc, err := HtmlCtxtReadDoc(ctxt, data, baseUrl, "", HTML_PARSE_RECOVER|HTML_PARSE_NOERROR|HTML_PARSE_NOWARNING)

	if err != nil {
		return
	}

	defer XmlFreeDoc(doc)

	xpathCtx, err := XmlXPathNewContext(doc)

	if err != nil {
		return
	}

	defer XmlXPathFreeContext(xpathCtx)

	xpathObj, err := XmlXPathEvalExpression(xpathExpr, xpathCtx)
	if err != nil {
		//fmt.Fprintf(os.Stderr,"Error: unable to evaluate xpath expression  \"%s\"\n" , xpathExpr)
		//return fmt.Errorf("error %d",1)
		return
	}

	defer XmlXPathFreeObject(xpathObj)

	ret = xpathObj.GetNodesetval()

	return
}