Mercurial > public > mercurial-scm > hg
diff rust/hg-core/src/re2/rust_re2.cpp @ 44305:d8d4fa9a7f18
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 |
| parents | |
| children |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/rust/hg-core/src/re2/rust_re2.cpp Thu Jan 16 13:34:04 2020 +0100 @@ -0,0 +1,49 @@ +/* +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); + } +}