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/*************************************************************************/
/*                                                                       */
/*                Centre for Speech Technology Research                  */
/*                     University of Edinburgh, UK                       */
/*                         Copyright (c) 1998                            */
/*                        All Rights Reserved.                           */
/*  Permission is hereby granted, free of charge, to use and distribute  */
/*  this software and its documentation without restriction, including   */
/*  without limitation the rights to use, copy, modify, merge, publish,  */
/*  distribute, sublicense, and/or sell copies of this work, and to      */
/*  permit persons to whom this work is furnished to do so, subject to   */
/*  the following conditions:                                            */
/*   1. The code must retain the above copyright notice, this list of    */
/*      conditions and the following disclaimer.                         */
/*   2. Any modifications must be clearly marked as such.                */
/*   3. Original authors' names are not deleted.                         */
/*   4. The authors' names are not used to endorse or promote products   */
/*      derived from this software without specific prior written        */
/*      permission.                                                      */
/*  THE UNIVERSITY OF EDINBURGH AND THE CONTRIBUTORS TO THIS WORK        */
/*  DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING      */
/*  ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT   */
/*  SHALL THE UNIVERSITY OF EDINBURGH NOR THE CONTRIBUTORS BE LIABLE     */
/*  FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES    */
/*  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN   */
/*  AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,          */
/*  ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF       */
/*  THIS SOFTWARE.                                                       */
/*                                                                       */
/*************************************************************************/
/*                       Author :  Alan W Black                          */
/*                       Date   :  February 1998                         */
/* --------------------------------------------------------------------- */
/*   Functions for TREE relations                                        */
/*                                                                       */
/*************************************************************************/
#ifndef __EST_RELATION_TREE_H__
#define __EST_RELATION_TREE_H__

/**@name Functions for building and traversing tree relations

 */
//@{

/**@name Tree traversal functions 
*/

//@{

/// return parent of <parameter>n</parameter>
inline EST_Item *parent(const EST_Item *n) { return iup(first(n)); }

/// return first daughter of <parameter>n</parameter>
inline EST_Item *daughter1(const EST_Item *n) { return idown(n); }

/// return second daughter of <parameter>n</parameter>
inline EST_Item *daughter2(const EST_Item *n) { return inext(idown(n)); }

/// return nth daughter of <parameter>n</parameter>
EST_Item *daughtern(const EST_Item *n, int nth);

/// return last daughter of <parameter>n</parameter>
inline EST_Item *daughtern(const EST_Item *n) { return last(idown(n)); }

/// return next sibling (sister) of <parameter>n</parameter>
inline EST_Item *next_sibling(const EST_Item *n) { return inext(n); }

/// return previous sibling (sister) of <parameter>n</parameter>
inline EST_Item *prev_sibling(const EST_Item *n) { return iprev(n); }

/// return root node of treeprevious sibling (sister) of <parameter>n</parameter>
inline EST_Item *root(const EST_Item *n) { return top(n); }

/** return parent of <parameter>n</parameter> as seen from relation 
<parameter>relname</parameter> */
inline EST_Item *parent(const EST_Item *n,const char *relname)
    { return parent(as(n,relname)); }

//inline EST_Item *daughters(const EST_Item *n,const char *relname)
//    { return daughters(as(n,relname)); }

/** return first daughter of <parameter>n</parameter> as seen from relation 
    <parameter>relname</parameter> */
inline EST_Item *daughter1(const EST_Item *n,const char *relname)
    { return daughter1(as(n,relname)); }

/** return second daughter of <parameter>n</parameter> as seen from relation 
    <parameter>relname</parameter> */
inline EST_Item *daughter2(const EST_Item *n,const char *relname)
    { return daughter2(as(n,relname)); }

/** return last daughter of <parameter>n</parameter> as seen from relation 
    <parameter>relname</parameter> */
inline EST_Item *daughtern(const EST_Item *n,const char *relname)
    { return daughtern(as(n,relname)); }

/** return next sibling (sister) of <parameter>n</parameter> as seen
     from relation <parameter>relname</parameter> */
inline EST_Item *next_sibling(const EST_Item *n,const char *relname)
    { return next_sibling(as(n,relname)); }

/** return previous sibling (sister) of <parameter>n</parameter> as seen 
    from relation <parameter>relname</parameter> */
inline EST_Item *prev_sibling(const EST_Item *n,const char *relname)
    { return prev_sibling(as(n,relname)); }

/** return root of tree of <parameter>n</parameter> as seen from
    relation <parameter>relname</parameter> */
inline EST_Item *root(const EST_Item *n,const char *relname)
    { return root(as(n,relname)); }

// should be deleted.
EST_Item *first_leaf_in_tree(const EST_Item *root);

// should be deleted.
EST_Item *last_leaf_in_tree(const EST_Item *root);

/** Return number of leaves (terminal nodes) under <parameter>n</parameter>
 */
int num_leaves(const EST_Item *n);

/** Given a node <parameter>t</parameter>, return true if
    <parameter>c</parameter> is under it in a tree */
int in_tree(const EST_Item *c,const  EST_Item *t);

//@}

/**@name Tree building functions */
//@{

/** Add a daughter to node <parameter>n</parameter>, after any
existing daughters, and return the next daughter. If
<parameter>p</parameter> is 0, make a new node for the daughter,
otherwise add <parameter>p</parameter> to this relation as
<parameter>n</parameter>'s daughter.  */

EST_Item *append_daughter(EST_Item *n, EST_Item *p=0);

/** Add a daughter to node <parameter>n</parameter> as seen from
relation <parameter>relname</parameter>, after any existing
daughters, and return the next daughter. If <parameter>p</parameter>
is 0, make a new node for the daughter, otherwise add
<parameter>p</parameter> to this relation as
<parameter>n</parameter>'s daughter.  */

EST_Item *append_daughter(EST_Item *n, const char *relname, EST_Item *p=0);

/** Add a daughter to node <parameter>n</parameter>, before any
existing daughters, and return the next daughter. If
<parameter>p</parameter> is 0, make a new node for the daughter,
otherwise add <parameter>p</parameter> to this relation as
<parameter>n</parameter>'s daughter.  */

EST_Item *prepend_daughter(EST_Item *n, EST_Item *p=0);

/** Add a daughter to node <parameter>n</parameter> as seen from
relation <parameter>relname</parameter>, before any existing
daughters, and return the next daughter. If <parameter>p</parameter>
is 0, make a new node for the daughter, otherwise add
<parameter>p</parameter> to this relation as
<parameter>n</parameter>'s daughter.  */

EST_Item *prepend_daughter(EST_Item *n, const char *relname, EST_Item *p=0);

//@}

//@}
#endif