Function xmlTextReaderNextTree

ThirdParty/libxml2/vtklibxml2/xmlreader.c:1875–1934

* * * Operating on a preparsed tree * * * ************************************************************************/

 *									*
 ************************************************************************/
static int
xmlTextReaderNextTree(xmlTextReaderPtr reader)
{
    if (reader == NULL)
        return(-1);

    if (reader->state == XML_TEXTREADER_END)
        return(0);

    if (reader->node == NULL) {
        if (reader->doc->children == NULL) {
            reader->state = XML_TEXTREADER_END;
            return(0);
        }

        reader->node = reader->doc->children;
        reader->state = XML_TEXTREADER_START;
        return(1);
    }

    if (reader->state != XML_TEXTREADER_BACKTRACK) {
	/* Here removed traversal to child, because we want to skip the subtree,
	replace with traversal to sibling to skip subtree */
        if (reader->node->next != 0) {
	    /* Move to sibling if present,skipping sub-tree */
            reader->node = reader->node->next;
            reader->state = XML_TEXTREADER_START;
            return(1);
        }

	/* if reader->node->next is NULL mean no subtree for current node,
	so need to move to sibling of parent node if present */
	reader->state = XML_TEXTREADER_BACKTRACK;
	/* This will move to parent if present */
	xmlTextReaderRead(reader);
    }

    if (reader->node->next != 0) {
        reader->node = reader->node->next;
        reader->state = XML_TEXTREADER_START;
        return(1);
    }

    if (reader->node->parent != 0) {
        if (reader->node->parent->type == XML_DOCUMENT_NODE) {
            reader->state = XML_TEXTREADER_END;
            return(0);
        }

        reader->node = reader->node->parent;
        reader->depth--;
        reader->state = XML_TEXTREADER_BACKTRACK;
	/* Repeat process to move to sibling of parent node if present */
        xmlTextReaderNextTree(reader);
    }

    reader->state = XML_TEXTREADER_END;