Add plugins (#27)

plugins/wasm-cpp/common/regex.h

@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2022 Alibaba Group Holding 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.
+ */
+
+#pragma once
+
+#include <stdexcept>
+#include <string>
+
+#include "re2/re2.h"
+
+namespace Wasm::Common::Regex {
+
+class CompiledGoogleReMatcher {
+ public:
+  CompiledGoogleReMatcher(const std::string& regex,
+                          bool do_program_size_check = true)
+      : regex_(regex, re2::RE2::Quiet) {
+    if (!regex_.ok()) {
+      throw std::runtime_error(regex_.error());
+    }
+    if (do_program_size_check) {
+      const auto regex_program_size =
+          static_cast<uint32_t>(regex_.ProgramSize());
+      if (regex_program_size > 100) {
+        throw std::runtime_error("too complex regex: " + regex);
+      }
+    }
+  }
+
+  bool match(std::string_view value) const {
+    return re2::RE2::FullMatch(re2::StringPiece(value.data(), value.size()),
+                               regex_);
+  }
+
+  std::string replaceAll(std::string_view value,
+                         std::string_view substitution) const {
+    std::string result = std::string(value);
+    re2::RE2::GlobalReplace(
+        &result, regex_,
+        re2::StringPiece(substitution.data(), substitution.size()));
+    return result;
+  }
+
+ private:
+  const re2::RE2 regex_;
+};
+
+}  // namespace Wasm::Common::Regex