root / logic / trunk / src / mxml / mxml-search.c @ 71
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/*
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* "$Id: mxml-search.c 297 2007-09-09 07:16:52Z mike $"
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*
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* Search/navigation functions for Mini-XML, a small XML-like file
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* parsing library.
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*
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* Copyright 2003-2007 by Michael Sweet.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* Contents:
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*
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* mxmlFindElement() - Find the named element.
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* mxmlWalkNext() - Walk to the next logical node in the tree.
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* mxmlWalkPrev() - Walk to the previous logical node in the tree.
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*/
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/*
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* Include necessary headers...
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*/
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#include "config.h" |
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#include "mxml.h" |
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/*
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* 'mxmlFindElement()' - Find the named element.
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*
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* The search is constrained by the name, attribute name, and value; any
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* NULL names or values are treated as wildcards, so different kinds of
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* searches can be implemented by looking for all elements of a given name
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* or all elements with a specific attribute. The descend argument determines
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* whether the search descends into child nodes; normally you will use
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* MXML_DESCEND_FIRST for the initial search and MXML_NO_DESCEND to find
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* additional direct descendents of the node. The top node argument
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* constrains the search to a particular node's children.
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*/
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mxml_node_t * /* O - Element node or NULL */
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mxmlFindElement(mxml_node_t *node, /* I - Current node */
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mxml_node_t *top, /* I - Top node */
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const char *name, /* I - Element name or NULL for any */ |
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const char *attr, /* I - Attribute name, or NULL for none */ |
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const char *value, /* I - Attribute value, or NULL for any */ |
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int descend) /* I - Descend into tree - MXML_DESCEND, MXML_NO_DESCEND, or MXML_DESCEND_FIRST */ |
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{ |
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const char *temp; /* Current attribute value */ |
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/*
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* Range check input...
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*/
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if (!node || !top || (!attr && value))
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return (NULL); |
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/*
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* Start with the next node...
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*/
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node = mxmlWalkNext(node, top, descend); |
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/*
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* Loop until we find a matching element...
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*/
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while (node != NULL) |
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{ |
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/*
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* See if this node matches...
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*/
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if (node->type == MXML_ELEMENT &&
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node->value.element.name && |
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(!name || !strcmp(node->value.element.name, name))) |
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{ |
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/*
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* See if we need to check for an attribute...
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*/
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if (!attr)
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return (node); /* No attribute search, return it... */ |
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/*
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* Check for the attribute...
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*/
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if ((temp = mxmlElementGetAttr(node, attr)) != NULL) |
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{ |
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/*
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* OK, we have the attribute, does it match?
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*/
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if (!value || !strcmp(value, temp))
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return (node); /* Yes, return it... */ |
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} |
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} |
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/*
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* No match, move on to the next node...
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*/
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if (descend == MXML_DESCEND)
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node = mxmlWalkNext(node, top, MXML_DESCEND); |
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else
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node = node->next; |
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} |
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return (NULL); |
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} |
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/*
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* 'mxmlWalkNext()' - Walk to the next logical node in the tree.
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*
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* The descend argument controls whether the first child is considered
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* to be the next node. The top node argument constrains the walk to
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* the node's children.
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*/
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mxml_node_t * /* O - Next node or NULL */
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mxmlWalkNext(mxml_node_t *node, /* I - Current node */
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mxml_node_t *top, /* I - Top node */
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int descend) /* I - Descend into tree - MXML_DESCEND, MXML_NO_DESCEND, or MXML_DESCEND_FIRST */ |
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{ |
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if (!node)
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return (NULL); |
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else if (node->child && descend) |
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return (node->child);
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else if (node == top) |
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return (NULL); |
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else if (node->next) |
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return (node->next);
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else if (node->parent && node->parent != top) |
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{ |
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node = node->parent; |
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while (!node->next)
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if (node->parent == top || !node->parent)
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return (NULL); |
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else
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node = node->parent; |
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return (node->next);
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} |
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else
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return (NULL); |
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} |
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/*
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* 'mxmlWalkPrev()' - Walk to the previous logical node in the tree.
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*
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* The descend argument controls whether the previous node's last child
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* is considered to be the previous node. The top node argument constrains
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* the walk to the node's children.
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*/
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mxml_node_t * /* O - Previous node or NULL */
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mxmlWalkPrev(mxml_node_t *node, /* I - Current node */
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mxml_node_t *top, /* I - Top node */
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int descend) /* I - Descend into tree - MXML_DESCEND, MXML_NO_DESCEND, or MXML_DESCEND_FIRST */ |
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{ |
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if (!node || node == top)
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return (NULL); |
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else if (node->prev) |
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{ |
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if (node->prev->last_child && descend)
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{ |
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/*
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* Find the last child under the previous node...
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*/
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node = node->prev->last_child; |
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while (node->last_child)
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node = node->last_child; |
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return (node);
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} |
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else
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return (node->prev);
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} |
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else if (node->parent != top) |
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return (node->parent);
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else
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return (NULL); |
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} |
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/*
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* End of "$Id: mxml-search.c 297 2007-09-09 07:16:52Z mike $".
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*/
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