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/**
* @file
* @ingroup cgraph_core
*/
/*************************************************************************
* Copyright (c) 2011 AT&T Intellectual Property
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-v10.html
*
* Contributors: Details at https://graphviz.org
*************************************************************************/
#include <cgraph/cghdr.h>
#include <stdbool.h>
/* The following functions take a graph and a template (node/edge/graph)
* and return the object representing the template within the local graph.
*/
static Agobj_t *subnode_search(Agraph_t * sub, Agobj_t * n)
{
if (agraphof(n) == sub)
return n;
return (Agobj_t *) agsubnode(sub, (Agnode_t *) n, 0);
}
static Agobj_t *subedge_search(Agraph_t * sub, Agobj_t * e)
{
if (agraphof(e) == sub)
return e;
return (Agobj_t *) agsubedge(sub, (Agedge_t *) e, 0);
}
static Agobj_t *subgraph_search(Agraph_t * sub, Agobj_t * g)
{
(void)g;
return (Agobj_t *) sub;
}
/* recursively apply objfn within the hierarchy of a graph.
* if obj is a node or edge, it and its images in every subg are visited.
* if obj is a graph, then it and its subgs are visited.
*/
static void rec_apply(Agraph_t * g, Agobj_t * obj, agobjfn_t fn, void *arg,
agobjsearchfn_t objsearch, bool preorder) {
Agraph_t *sub;
Agobj_t *subobj;
if (preorder)
fn(g, obj, arg);
for (sub = agfstsubg(g); sub; sub = agnxtsubg(sub)) {
if ((subobj = objsearch(sub, obj)))
rec_apply(sub, subobj, fn, arg, objsearch, preorder);
}
if (!preorder)
fn(g, obj, arg);
}
int agapply(Agraph_t * g, Agobj_t * obj, agobjfn_t fn, void *arg,
int preorder)
{
Agobj_t *subobj;
agobjsearchfn_t objsearch;
switch (AGTYPE(obj)) {
case AGRAPH:
objsearch = subgraph_search;
break;
case AGNODE:
objsearch = subnode_search;
break;
case AGOUTEDGE:
case AGINEDGE:
objsearch = subedge_search;
break;
default:
agerrorf("agapply: unknown object type %d\n", AGTYPE(obj));
return FAILURE;
}
if ((subobj = objsearch(g, obj))) {
rec_apply(g, subobj, fn, arg, objsearch, preorder != 0);
return SUCCESS;
} else
return FAILURE;
}
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