Last change
on this file since 5810 was
5725,
checked in by cameron, 16 months ago
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Utility functions for regular expression transformations
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File size:
1.2 KB
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1 | /* |
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2 | * Copyright (c) 2017 International Characters. |
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3 | * This software is licensed to the public under the Open Software License 3.0. |
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4 | * icgrep is a trademark of International Characters. |
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5 | */ |
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6 | |
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7 | #include "re_assertion.h" |
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8 | #include "re_seq.h" |
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9 | #include "re_alt.h" |
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10 | #include "re_nullable.h" |
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11 | |
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12 | using namespace llvm; |
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13 | |
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14 | namespace re { |
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15 | |
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16 | RE * expandBoundaryAssertion (RE * re) { |
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17 | if (Assertion * a = dyn_cast<Assertion>(re)) { |
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18 | if (a->getKind() == Assertion::Kind::Boundary) { |
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19 | RE * asserted = a->getAsserted(); |
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20 | RE * behindP = makeAssertion(asserted, Assertion::Kind::Lookbehind, Assertion::Sense::Positive); |
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21 | RE * behindN = makeAssertion(asserted, Assertion::Kind::Lookbehind, Assertion::Sense::Negative); |
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22 | RE * aheadP = makeAssertion(asserted, Assertion::Kind::Lookahead, Assertion::Sense::Positive); |
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23 | RE * aheadN = makeAssertion(asserted, Assertion::Kind::Lookahead, Assertion::Sense::Negative); |
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24 | if (a->getSense() == Assertion::Sense::Positive) { |
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25 | return makeAlt({makeSeq({behindP, aheadN}), makeSeq({behindN, aheadP})}); |
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26 | } else { |
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27 | return makeAlt({makeSeq({behindP, aheadP}), makeSeq({behindN, aheadN})}); |
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28 | } |
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29 | } |
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30 | } |
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31 | return re; |
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32 | } |
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33 | } |
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