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/*
* "$Id: mxml-search.c 184 2005-01-29 07:21:44Z mike $"
*
* Search/navigation functions for Mini-XML, a small XML-like file
* parsing library.
*
* Copyright 2003-2005 by Michael Sweet.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* Contents:
*
* mxmlFindElement() - Find the named element.
* mxmlWalkNext() - Walk to the next logical node in the tree.
* mxmlWalkPrev() - Walk to the previous logical node in the tree.
*/
/*
* Include necessary headers...
*/
#include "config.h"
#include "mxml.h"
/*
* 'mxmlFindElement()' - Find the named element.
*
* The search is constrained by the name, attribute name, and value; any
* NULL names or values are treated as wildcards, so different kinds of
* searches can be implemented by looking for all elements of a given name
* or all elements with a specific attribute. The descend argument determines
* whether the search descends into child nodes; normally you will use
* MXML_DESCEND_FIRST for the initial search and MXML_NO_DESCEND to find
* additional direct descendents of the node. The top node argument
* constrains the search to a particular node's children.
*/
mxml_node_t * /* O - Element node or NULL */
mxmlFindElement(mxml_node_t *node, /* I - Current node */
mxml_node_t *top, /* I - Top node */
const char *name, /* I - Element name or NULL for any */
const char *attr, /* I - Attribute name, or NULL for none */
const char *value, /* I - Attribute value, or NULL for any */
int descend) /* I - Descend into tree - MXML_DESCEND, MXML_NO_DESCEND, or MXML_DESCEND_FIRST */
{
const char *temp; /* Current attribute value */
/*
* Range check input...
*/
if (!node || !top || (!attr && value))
return (NULL);
/*
* Start with the next node...
*/
node = mxmlWalkNext(node, top, descend);
/*
* Loop until we find a matching element...
*/
while (node != NULL)
{
/*
* See if this node matches...
*/
if (node->type == MXML_ELEMENT &&
node->value.element.name &&
(!name || !strcmp(node->value.element.name, name)))
{
/*
* See if we need to check for an attribute...
*/
if (!attr)
return (node); /* No attribute search, return it... */
/*
* Check for the attribute...
*/
if ((temp = mxmlElementGetAttr(node, attr)) != NULL)
{
/*
* OK, we have the attribute, does it match?
*/
if (!value || !strcmp(value, temp))
return (node); /* Yes, return it... */
}
}
/*
* No match, move on to the next node...
*/
if (descend == MXML_DESCEND)
node = mxmlWalkNext(node, top, MXML_DESCEND);
else
node = node->next;
}
return (NULL);
}
/*
* 'mxmlWalkNext()' - Walk to the next logical node in the tree.
*
* The descend argument controls whether the first child is considered
* to be the next node. The top node argument constrains the walk to
* the node's children.
*/
mxml_node_t * /* O - Next node or NULL */
mxmlWalkNext(mxml_node_t *node, /* I - Current node */
mxml_node_t *top, /* I - Top node */
int descend) /* I - Descend into tree - MXML_DESCEND, MXML_NO_DESCEND, or MXML_DESCEND_FIRST */
{
if (!node)
return (NULL);
else if (node->child && descend)
return (node->child);
else if (node->next)
return (node->next);
else if (node->parent && node->parent != top)
{
node = node->parent;
while (!node->next)
if (node->parent == top || !node->parent)
return (NULL);
else
node = node->parent;
return (node->next);
}
else
return (NULL);
}
/*
* 'mxmlWalkPrev()' - Walk to the previous logical node in the tree.
*
* The descend argument controls whether the previous node's last child
* is considered to be the previous node. The top node argument constrains
* the walk to the node's children.
*/
mxml_node_t * /* O - Previous node or NULL */
mxmlWalkPrev(mxml_node_t *node, /* I - Current node */
mxml_node_t *top, /* I - Top node */
int descend) /* I - Descend into tree - MXML_DESCEND, MXML_NO_DESCEND, or MXML_DESCEND_FIRST */
{
if (!node)
return (NULL);
else if (node->prev)
{
if (node->prev->last_child && descend)
{
/*
* Find the last child under the previous node...
*/
node = node->prev->last_child;
while (node->last_child)
node = node->last_child;
return (node);
}
else
return (node->prev);
}
else if (node->parent != top)
return (node->parent);
else
return (NULL);
}
/*
* End of "$Id: mxml-search.c 184 2005-01-29 07:21:44Z mike $".
*/
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