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annotate rust/hg-core/src/re2/rust_re2.cpp @ 44305:d8d4fa9a7f18

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rust-re2: add wrapper for calling Re2 from Rust This assumes that Re2 is installed following Google's guide. I am not sure how we want to integrate it in the project, but I think a follow-up patch would be more appropriate for such work. As it stands, *not* having Re2 installed results in a compilation error, which is a problem as it breaks install compatibility. Hence, this is gated behind a non-default `with-re2` compilation feature. Differential Revision: https://phab.mercurial-scm.org/D7910
author Rapha?l Gom?s <rgomes@octobus.net>
date Thu, 16 Jan 2020 13:34:04 +0100
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44305
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1 /*
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2 rust_re2.cpp
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3
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4 C ABI export of Re2's C++ interface for Rust FFI.
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5
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6 Copyright 2020 Valentin Gatien-Baron
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7
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8 This software may be used and distributed according to the terms of the
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9 GNU General Public License version 2 or any later version.
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10 */
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11
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12 #include <re2/re2.h>
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13 using namespace re2;
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14
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15 extern "C" {
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16 RE2* rust_re2_create(const char* data, size_t len) {
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17 RE2::Options o;
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18 o.set_encoding(RE2::Options::Encoding::EncodingLatin1);
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19 o.set_log_errors(false);
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20 o.set_max_mem(50000000);
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21
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22 return new RE2(StringPiece(data, len), o);
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23 }
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24
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25 void rust_re2_destroy(RE2* re) {
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26 delete re;
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27 }
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28
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29 bool rust_re2_ok(RE2* re) {
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30 return re->ok();
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31 }
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32
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33 void rust_re2_error(RE2* re, const char** outdata, size_t* outlen) {
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34 const std::string& e = re->error();
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35 *outdata = e.data();
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36 *outlen = e.length();
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37 }
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38
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39 bool rust_re2_match(RE2* re, char* data, size_t len, int ianchor) {
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40 const StringPiece sp = StringPiece(data, len);
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41
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42 RE2::Anchor anchor =
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43 ianchor == 0 ? RE2::Anchor::UNANCHORED :
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44 (ianchor == 1 ? RE2::Anchor::ANCHOR_START :
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45 RE2::Anchor::ANCHOR_BOTH);
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46
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47 return re->Match(sp, 0, len, anchor, NULL, 0);
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48 }
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49 }