init push

src/share/ob_list_parser.h

@@ -0,0 +1,75 @@
+/**
+ * Copyright (c) 2021 OceanBase
+ * OceanBase CE is licensed under Mulan PubL v2.
+ * You can use this software according to the terms and conditions of the Mulan PubL v2.
+ * You may obtain a copy of Mulan PubL v2 at:
+ *          http://license.coscl.org.cn/MulanPubL-2.0
+ * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
+ * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
+ * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+ * See the Mulan PubL v2 for more details.
+ */
+
+#ifndef __OCEANBASE_SHARE_LIST_PARSER_H__
+#define __OCEANBASE_SHARE_LIST_PARSER_H__
+
+#include "lib/ob_define.h"
+
+namespace oceanbase {
+namespace share {
+
+class ObListMatchCb {
+  public:
+  virtual int match(const char* value) = 0;
+  virtual bool finish()
+  {
+    return true;
+  }
+};
+
+class ObListParser {
+  public:
+  ObListParser() : SYM_LIST_SEP(','), allow_space_(false), token_(0), cur_(NULL), cb_(NULL)
+  {}
+  ObListParser(char list_sep) : SYM_LIST_SEP(list_sep), token_(0), cur_(NULL), cb_(NULL)
+  {}
+  ~ObListParser() = default;
+  void set_match_callback(ObListMatchCb& cb)
+  {
+    cb_ = &cb;
+  }
+  // Whether to ignore the spaces before and after the value
+  void set_allow_space(bool allow)
+  {
+    allow_space_ = allow;
+  }
+  int parse(const char* data);
+
+  private:
+  int match(int sym);
+  int get_token();  // Pre-reading symbol
+  private:
+  static const int MAX_TOKEN_SIZE = 1024;
+  // Symbol table
+  static const int SYM_END = 0;
+  static const int SYM_KEY = 1;
+  static const int SYM_VALUE = 2;
+  // Delimiter
+  // Can be customized according to different scenarios, such as
+  // e.g.1 value1,value2,value3...
+  const char SYM_LIST_SEP;  // The separator in the middle of value','
+  // Temporary variables
+  bool allow_space_;  // Whether to allow spaces
+  int token_;
+  char value_buf_[MAX_TOKEN_SIZE];
+  const char* cur_;
+  // Call back every time a List is parsed
+  ObListMatchCb* cb_;
+
+  DISALLOW_COPY_AND_ASSIGN(ObListParser);
+};
+
+}  // namespace share
+}  // namespace oceanbase
+#endif /* __OCEANBASE_SHARE_LIST_PARSER_H__ */
+//// end of header file