1 /*
2 * Copyright (c) 2015, Intel Corporation
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
6 *
7 * * Redistributions of source code must retain the above copyright notice,
8 * this list of conditions and the following disclaimer.
9 * * Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * * Neither the name of Intel Corporation nor the names of its contributors
13 * may be used to endorse or promote products derived from this software
14 * without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 /** \file
30 * \brief Word Boundary Assertion (\\b or \\B)
31 */
32 #include "ComponentWordBoundary.h"
33 #include "buildstate.h"
34 #include "parse_error.h"
35 #include "Parser.h"
36 #include "position_info.h"
37 #include "nfagraph/ng_builder.h"
38
39 using namespace std;
40
41 namespace ue2 {
42
ComponentWordBoundary(u32 loc_in,bool neg,const ParseMode & mode)43 ComponentWordBoundary::ComponentWordBoundary(u32 loc_in, bool neg,
44 const ParseMode &mode)
45 : loc(loc_in), position(GlushkovBuildState::POS_UNINITIALIZED),
46 negated(neg), ucp(mode.ucp), prefilter(false) {}
47
~ComponentWordBoundary()48 ComponentWordBoundary::~ComponentWordBoundary() {
49 // empty
50 }
51
clone() const52 ComponentWordBoundary * ComponentWordBoundary::clone() const {
53 return new ComponentWordBoundary(*this);
54 }
55
first() const56 vector<PositionInfo> ComponentWordBoundary::first() const {
57 vector<PositionInfo> firsts;
58 firsts.push_back(position);
59 return firsts;
60 }
61
last() const62 vector<PositionInfo> ComponentWordBoundary::last() const {
63 // Same as firsts
64 return first();
65 }
66
empty() const67 bool ComponentWordBoundary::empty() const {
68 return false;
69 }
70
repeatable() const71 bool ComponentWordBoundary::repeatable() const {
72 return false;
73 }
74
notePositions(GlushkovBuildState & bs)75 void ComponentWordBoundary::notePositions(GlushkovBuildState &bs) {
76 NFABuilder &builder = bs.getBuilder();
77 position = builder.makePositions(1);
78
79 if (ucp) {
80 assert(prefilter); // only in prefiltering mode!
81 if (negated) {
82 builder.setAssertFlag(position, POS_FLAG_ASSERT_WORD_TO_WORD_UCP
83 | POS_FLAG_ASSERT_NONWORD_TO_NONWORD_UCP);
84 } else {
85 builder.setAssertFlag(position, POS_FLAG_ASSERT_WORD_TO_NONWORD_UCP
86 | POS_FLAG_ASSERT_NONWORD_TO_WORD_UCP);
87 }
88 } else {
89 if (negated) {
90 builder.setAssertFlag(position, POS_FLAG_ASSERT_WORD_TO_WORD
91 | POS_FLAG_ASSERT_NONWORD_TO_NONWORD);
92 } else {
93 builder.setAssertFlag(position, POS_FLAG_ASSERT_WORD_TO_NONWORD
94 | POS_FLAG_ASSERT_NONWORD_TO_WORD);
95 }
96 }
97 recordPosBounds(position, position + 1);
98 }
99
buildFollowSet(GlushkovBuildState &,const vector<PositionInfo> &)100 void ComponentWordBoundary::buildFollowSet(GlushkovBuildState&,
101 const vector<PositionInfo>&) {
102 // No internal connections, nowt to do
103 }
104
105 } // namespace ue2
106