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/* struct::graph - critcl - layer 1 declarations
* (b) Node operations.
*/
#include <arc.h>
#include <node.h>
#include <util.h>
/* .................................................. */
GN*
gn_new (G* g, const char* name)
{
GN* n;
int new;
if (Tcl_FindHashEntry (g->nodes.map, name) != NULL) {
Tcl_Panic ("struct::graph(c) gn_new - tried to use duplicate name for new node");
}
n = ALLOC (GN);
gc_setup ((GC*) n, &g->nodes, name, g);
gc_add ((GC*) n, &g->nodes);
gn_shimmer_self (n);
n->in.first = NULL; n->in.n = 0;
n->out.first = NULL; n->out.n = 0;
return n;
}
void
gn_delete (GN* n)
{
/* We assume that the node may still have incoming and outgoing arcs. They
* are deleted recursively.
*/
gc_remove ((GC*) n, &n->base.graph->nodes);
gc_delete ((GC*) n);
while (n->in.first) { ga_delete (n->in.first->a); }
while (n->out.first) { ga_delete (n->out.first->a); }
n->in.first = NULL; n->in.n = 0;
n->out.first = NULL; n->out.n = 0;
ckfree ((char*) n);
}
/* .................................................. */
void
gn_err_duplicate (Tcl_Interp* interp, Tcl_Obj* n, Tcl_Obj* g)
{
Tcl_Obj* err = Tcl_NewObj ();
Tcl_AppendToObj (err, "node \"", -1);
Tcl_AppendObjToObj (err, n);
Tcl_AppendToObj (err, "\" already exists in graph \"", -1);
Tcl_AppendObjToObj (err, g);
Tcl_AppendToObj (err, "\"", -1);
Tcl_SetObjResult (interp, err);
}
void
gn_err_missing (Tcl_Interp* interp, Tcl_Obj* n, Tcl_Obj* g)
{
Tcl_Obj* err = Tcl_NewObj ();
/* Keep any prefix ... */
Tcl_AppendObjToObj (err, Tcl_GetObjResult (interp));
Tcl_AppendToObj (err, "node \"", -1);
Tcl_AppendObjToObj (err, n);
Tcl_AppendToObj (err, "\" does not exist in graph \"", -1);
Tcl_AppendObjToObj (err, g);
Tcl_AppendToObj (err, "\"", -1);
Tcl_SetObjResult (interp, err);
}
/* .................................................. */
Tcl_Obj*
gn_serial_arcs (GN* n, Tcl_Obj* empty, Tcl_HashTable* cn)
{
int lc;
Tcl_Obj** lv;
Tcl_Obj* arcs;
GL* il;
GA* a;
int i, id;
Tcl_HashEntry* he;
/* Quick return if node has no outgoing arcs */
if (!n->out.n) return empty;
lc = n->out.n;
lv = NALLOC (lc, Tcl_Obj*);
for (i=0, il = n->out.first;
il != NULL;
il = il->next) {
a = il->a;
he = Tcl_FindHashEntry (cn, (char*) a->end->n);
/* Ignore arcs which lead out of the subgraph spanned up by the nodes
* in 'cn'.
*/
if (!he) continue;
ASSERT_BOUNDS(i, lc);
id = (int) Tcl_GetHashValue (he);
lv [i] = ga_serial (a, empty, id);
i++;
}
lc = i;
arcs = Tcl_NewListObj (lc, lv);
ckfree ((char*) lv);
return arcs;
}
/* .................................................. */
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/
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