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
/*
rust_re2.cpp
C ABI export of Re2's C++ interface for Rust FFI.
Copyright 2020 Valentin Gatien-Baron
This software may be used and distributed according to the terms of the
GNU General Public License version 2 or any later version.
*/
#include <re2/re2.h>
using namespace re2;
extern "C" {
RE2* rust_re2_create(const char* data, size_t len) {
RE2::Options o;
o.set_encoding(RE2::Options::Encoding::EncodingLatin1);
o.set_log_errors(false);
o.set_max_mem(50000000);
return new RE2(StringPiece(data, len), o);
}
void rust_re2_destroy(RE2* re) {
delete re;
}
bool rust_re2_ok(RE2* re) {
return re->ok();
}
void rust_re2_error(RE2* re, const char** outdata, size_t* outlen) {
const std::string& e = re->error();
*outdata = e.data();
*outlen = e.length();
}
bool rust_re2_match(RE2* re, char* data, size_t len, int ianchor) {
const StringPiece sp = StringPiece(data, len);
RE2::Anchor anchor =
ianchor == 0 ? RE2::Anchor::UNANCHORED :
(ianchor == 1 ? RE2::Anchor::ANCHOR_START :
RE2::Anchor::ANCHOR_BOTH);
return re->Match(sp, 0, len, anchor, NULL, 0);
}
}