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 ************************************************************************
    FAUST compiler
    Copyright (C) 2003-2018 GRAME, Centre National de Creation Musicale
    ---------------------------------------------------------------------
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    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.

    You should have received a copy of the GNU General Public License
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 ************************************************************************
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/**
 * @file occurrences.cpp
 * Count the number of occurences of each subtree of a root tree.
 */

// construction des representations graphiques

#include "occurrences.hh"
#include "compatibility.hh"

/**
 * Count the number of occurrences of each subtree of root
 */
Occurrences::Occurrences(Tree root)
{
    fKey = specificKey(root);
    countOccurrences(root);
    setCount(root, 0);  // root as no occurences in itself
}

/**
 * Get the number of occurrences of t
 */
int Occurrences::getCount(Tree t)
{
    Tree c;
    return (getProperty(t, fKey, c)) ? c->node().getInt() : 0;
}

/**
 * Set the number of occurrences of t
 */
void Occurrences::setCount(Tree t, int c)
{
    setProperty(t, fKey, tree(c));
}

/**
 * Creates a specific property key for occurrences count in root
 */
Tree Occurrences::specificKey(Tree root)
{
    char keyname[256];
    snprintf(keyname, 256, "OCCURRENCES COUNT IN %p : ", (void*)(CTree*)root);

    return tree(unique(keyname));
}

/**
 * Increment the occurrences count of t and its subtrees
 */
void Occurrences::countOccurrences(Tree t)
{
    setCount(t, getCount(t) + 1);  // increment t occurrences count
    for (int i = 0; i < t->arity(); i++) {
        countOccurrences(t->branch(i));
    }
}
