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/*
* Copyright (c) 2015-2016, Intel Corporation
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Intel Corporation nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "ng_holder.h"
#include "ng_util.h"
#include "ue2common.h"
using namespace std;
namespace ue2 {
// internal use only
static NFAVertex addSpecialVertex(NGHolder &g, SpecialNodes id) {
NFAVertex v(add_vertex(g));
g[v].index = id;
return v;
}
NGHolder::NGHolder(nfa_kind k)
: kind (k),
// add initial special nodes
start(addSpecialVertex(*this, NODE_START)),
startDs(addSpecialVertex(*this, NODE_START_DOTSTAR)),
accept(addSpecialVertex(*this, NODE_ACCEPT)),
acceptEod(addSpecialVertex(*this, NODE_ACCEPT_EOD)) {
// wire up some fake edges for the stylized bits of the NFA
add_edge(start, startDs, *this);
add_edge(startDs, startDs, *this);
add_edge(accept, acceptEod, *this);
(*this)[start].char_reach.setall();
(*this)[startDs].char_reach.setall();
}
NGHolder::~NGHolder(void) {
DEBUG_PRINTF("destroying holder @ %p\n", this);
}
void clear_graph(NGHolder &h) {
NGHolder::vertex_iterator vi, ve;
for (tie(vi, ve) = vertices(h); vi != ve;) {
NFAVertex v = *vi;
++vi;
clear_vertex(v, h);
if (!is_special(v, h)) {
remove_vertex(v, h);
}
}
assert(num_vertices(h) == N_SPECIALS);
renumber_vertices(h); /* ensure that we reset our next allocated index */
renumber_edges(h);
// Recreate special stylised edges.
add_edge(h.start, h.startDs, h);
add_edge(h.startDs, h.startDs, h);
add_edge(h.accept, h.acceptEod, h);
}
NFAVertex NGHolder::getSpecialVertex(u32 id) const {
switch (id) {
case NODE_START: return start;
case NODE_START_DOTSTAR: return startDs;
case NODE_ACCEPT: return accept;
case NODE_ACCEPT_EOD: return acceptEod;
default: return null_vertex();
}
}
}
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