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