Add GN Build Files and Custom Modifications

Issue:https://gitee.com/openharmony/build/issues/I6UFTP
Signed-off-by: lubinglun <lubinglun@huawei.com>

BUILD.gn

@@ -0,0 +1,49 @@
+# Copyright (c) 2023 Huawei Device Co., Ltd.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import("//build/ohos.gni")
+
+ohos_cargo_crate("lib") {
+    crate_name = "regex"
+    crate_type = "rlib"
+    crate_root = "src/lib.rs"
+
+    sources = ["src/lib.rs"]
+    edition = "2018"
+    cargo_pkg_version = "1.7.1"
+    cargo_pkg_authors = "The Rust Project Developers"
+    cargo_pkg_name = "regex"
+    deps = [
+        "//third_party/rust/crates/aho-corasick:lib",
+        "//third_party/rust/crates/memchr:lib",
+        "//third_party/rust/crates/regex/regex-syntax:lib",
+    ]
+    features = [
+        "aho-corasick",
+        "memchr",
+        "perf",
+        "perf-cache",
+        "perf-dfa",
+        "perf-inline",
+        "perf-literal",
+        "std",
+        "unicode",
+        "unicode-age",
+        "unicode-bool",
+        "unicode-case",
+        "unicode-gencat",
+        "unicode-perl",
+        "unicode-script",
+        "unicode-segment",
+    ]
+}

regex-syntax/BUILD.gn

@@ -0,0 +1,37 @@
+# Copyright (c) 2023 Huawei Device Co., Ltd.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import("//build/ohos.gni")
+
+ohos_cargo_crate("lib") {
+    crate_name = "regex_syntax"
+    crate_type = "rlib"
+    crate_root = "src/lib.rs"
+
+    sources = ["src/lib.rs"]
+    edition = "2018"
+    cargo_pkg_version = "0.6.28"
+    cargo_pkg_authors = "The Rust Project Developers"
+    cargo_pkg_name = "regex-syntax"
+    cargo_pkg_description = "A regular expression parser."
+    features = [
+        "unicode",
+        "unicode-age",
+        "unicode-bool",
+        "unicode-case",
+        "unicode-gencat",
+        "unicode-perl",
+        "unicode-script",
+        "unicode-segment",
+    ]
+}

regex-syntax/src/lib.rs

@@ -157,7 +157,7 @@ The following features are available:
 #![deny(missing_docs)]
 #![warn(missing_debug_implementations)]
 #![forbid(unsafe_code)]
-
+#![allow(clippy::derive_ord_xor_partial_ord)]
 pub use crate::error::{Error, Result};
 pub use crate::parser::{Parser, ParserBuilder};
 pub use crate::unicode::UnicodeWordError;

src/lib.rs

@@ -611,7 +611,7 @@ another matching engine with fixed memory requirements.
 #![deny(missing_docs)]
 #![cfg_attr(feature = "pattern", feature(pattern))]
 #![warn(missing_debug_implementations)]
-
+#![allow(clippy::if_same_then_else)]
 #[cfg(not(feature = "std"))]
 compile_error!("`std` feature is currently required to build this crate");