content: /*
   * Copyright 1999-2017 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.
   */
  package com.alibaba.druid.sql.dialect.oracle.parser;
  
  import com.alibaba.druid.DbType;
  import com.alibaba.druid.sql.parser.*;
  
  import java.util.HashMap;
  import java.util.Map;
  
  import static com.alibaba.druid.sql.parser.CharTypes.isIdentifierChar;
  import static com.alibaba.druid.sql.parser.DialectFeature.LexerFeature.*;
  import static com.alibaba.druid.sql.parser.DialectFeature.ParserFeature.*;
  import static com.alibaba.druid.sql.parser.LayoutCharacters.EOI;
  
  public class OracleLexer extends Lexer {
      static final Keywords ORACLE_KEYWORDS;
      static final DialectFeature ORACLE_FEATURE = new DialectFeature();
      static {
          Map<String, Token> map = new HashMap<>(Keywords.DEFAULT_KEYWORDS.getKeywords());
  
          map.put("BEGIN", Token.BEGIN);
          map.put("COMMENT", Token.COMMENT);
          map.put("COMMIT", Token.COMMIT);
          map.put("CONNECT", Token.CONNECT);
          map.put("CONTINUE", Token.CONTINUE);
  
          map.put("CROSS", Token.CROSS);
          map.put("CURSOR", Token.CURSOR);
          map.put("DECLARE", Token.DECLARE);
          map.put("ERRORS", Token.ERRORS);
          map.put("EXCEPTION", Token.EXCEPTION);
  
          map.put("EXCLUSIVE", Token.EXCLUSIVE);
          map.put("EXTRACT", Token.EXTRACT);
          map.put("GOTO", Token.GOTO);
          map.put("IF", Token.IF);
          map.put("ELSIF", Token.ELSIF);
  
          map.put("LIMIT", Token.LIMIT);
          map.put("LOOP", Token.LOOP);
          map.put("MATCHED", Token.MATCHED);
          map.put("MERGE", Token.MERGE);
  
          map.put("MODE", Token.MODE);
          //        map.put("MODEL", Token.MODEL);
          map.put("NOWAIT", Token.NOWAIT);
          map.put("OF", Token.OF);
          map.put("PRIOR", Token.PRIOR);
  
          map.put("REJECT", Token.REJECT);
          map.put("RETURN", Token.RETURN);
          map.put("RETURNING", Token.RETURNING);
          map.put("REVERSE", Token.REVERSE);
          map.put("SAVEPOINT", Token.SAVEPOINT);
          map.put("SESSION", Token.SESSION);
  
          map.put("SHARE", Token.SHARE);
          map.put("START", Token.START);
          map.put("SYSDATE", Token.SYSDATE);
          map.put("UNLIMITED", Token.UNLIMITED);
          map.put("USING", Token.USING);
  
          map.put("WAIT", Token.WAIT);
          map.put("WITH", Token.WITH);
  
          map.put("PCTFREE", Token.PCTFREE);
          map.put("INITRANS", Token.INITRANS);
          map.put("MAXTRANS", Token.MAXTRANS);
          map.put("SEGMENT", Token.SEGMENT);
          map.put("CREATION", Token.CREATION);
          map.put("IMMEDIATE", Token.IMMEDIATE);
          map.put("DEFERRED", Token.DEFERRED);
          map.put("STORAGE", Token.STORAGE);
          map.put("NEXT", Token.NEXT);
          map.put("MINEXTENTS", Token.MINEXTENTS);
          map.put("MAXEXTENTS", Token.MAXEXTENTS);
          map.put("MAXSIZE", Token.MAXSIZE);
          map.put("PCTINCREASE", Token.PCTINCREASE);
          map.put("FLASH_CACHE", Token.FLASH_CACHE);
          map.put("CELL_FLASH_CACHE", Token.CELL_FLASH_CACHE);
          map.put("NONE", Token.NONE);
          map.put("LOB", Token.LOB);
          map.put("STORE", Token.STORE);
          map.put("ROW", Token.ROW);
          map.put("CHUNK", Token.CHUNK);
          map.put("CACHE", Token.CACHE);
          map.put("NOCACHE", Token.NOCACHE);
          map.put("LOGGING", Token.LOGGING);
          map.put("NOCOMPRESS", Token.NOCOMPRESS);
          map.put("KEEP_DUPLICATES", Token.KEEP_DUPLICATES);
          map.put("EXCEPTIONS", Token.EXCEPTIONS);
          map.put("PURGE", Token.PURGE);
          map.put("INITIALLY", Token.INITIALLY);
  
          map.put("FETCH", Token.FETCH);
          map.put("TABLESPACE", Token.TABLESPACE);
          map.put("PARTITION", Token.PARTITION);
          map.put("TRUE", Token.TRUE);
          map.put("FALSE", Token.FALSE);
          map.put("CASCADE", Token.CASCADE);
          map.put("MATCHED", Token.MATCHED);
  
          map.put("，", Token.COMMA);
          map.put("（", Token.LPAREN);
          map.put("）", Token.RPAREN);
  
          ORACLE_KEYWORDS = new Keywords(map);
          ORACLE_FEATURE.configFeature(
                  ScanSQLTypeWithBegin,
                  SQLDateExpr,
                  PrimaryVariantColon,
                  CreateTableBodySupplemental,
                  AsCommaFrom
          );
          ORACLE_FEATURE.unconfigFeature(SQLTimestampExpr);
      }
  
      @Override
      protected Keywords loadKeywords() {
          return ORACLE_KEYWORDS;
      }
  
      public OracleLexer(char[] input, int inputLength, boolean skipComment) {
          super(input, inputLength, skipComment);
          dbType = DbType.oracle;
      }
  
      public OracleLexer(String input) {
          super(input);
          this.skipComment = true;
          this.keepComments = true;
          dbType = DbType.oracle;
      }
  
      public OracleLexer(String input, SQLParserFeature... features) {
          super(input);
          this.skipComment = true;
          this.keepComments = true;
          dbType = DbType.oracle;
  
          for (SQLParserFeature feature : features) {
              config(feature, true);
          }
      }
  
      public void scanVariable() {
          final char c0 = ch;
          if (c0 != ':' && c0 != '#' && c0 != '$') {
              throw new ParserException("illegal variable. " + info());
          }
  
          mark = pos;
          bufPos = 1;
          char ch;
  
          boolean quoteFlag = false;
          boolean mybatisFlag = false;
  
          char c1 = charAt(pos + 1);
          if (c0 == ':' && c1 == ' ') {
              pos++;
              bufPos = 2;
              c1 = charAt(pos + 1);
          }
  
          if (c1 == '"') {
              pos++;
              bufPos++;
              quoteFlag = true;
          } else if (c1 == '{') {
              pos++;
              bufPos++;
              mybatisFlag = true;
          }
  
          if (c0 == ':' && c1 >= '0' && c1 <= '9') {
              for (; ; ) {
                  ch = charAt(++pos);
  
                  if (ch < '0' || ch > '9') {
                      break;
                  }
  
                  bufPos++;
              }
          } else {
              for (; ; ) {
                  ch = charAt(++pos);
  
                  if (!isIdentifierChar(ch) && ch != ':') {
                      break;
                  }
  
                  bufPos++;
              }
          }
  
          if (quoteFlag) {
              if (ch != '"') {
                  throw new ParserException("syntax error. " + info());
              }
              ++pos;
              bufPos++;
          } else if (mybatisFlag) {
              if (ch != '}') {
                  throw new ParserException("syntax error" + info());
              }
              ++pos;
              bufPos++;
          }
  
          this.ch = charAt(pos);
  
          stringVal = addSymbol();
          Token tok = keywords.getKeyword(stringVal);
          if (tok != null) {
              token = tok;
          } else {
              token = Token.VARIANT;
          }
      }
  
      protected void scanVariable_at() {
          scanChar();
  
          if (ch == '@') {
              scanChar();
              token = Token.MONKEYS_AT_AT;
          } else {
              token = Token.MONKEYS_AT;
          }
      }
  
      public void scanComment() {
          if (ch != '/' && ch != '-') {
              throw new IllegalStateException();
          }
  
          mark = pos;
          bufPos = 0;
          scanChar();
  
          // /*+ */
          if (ch == '*') {
              scanChar();
              bufPos++;
  
              while (ch == ' ') {
                  scanChar();
                  bufPos++;
              }
  
              boolean isHint = false;
              int startHintSp = bufPos + 1;
              if (ch == '+') {
                  isHint = true;
                  scanChar();
                  bufPos++;
              }
  
              while (!isEOF()) {
                  if (ch == '*' && charAt(pos + 1) == '/') {
                      bufPos += 2;
                      scanChar();
                      scanChar();
                      break;
                  }
  
                  scanChar();
                  bufPos++;
              }
  
              if (isHint) {
                  stringVal = subString(mark + startHintSp, (bufPos - startHintSp) - 1);
                  token = Token.HINT;
              } else {
                  stringVal = subString(mark, bufPos + 1);
                  token = Token.MULTI_LINE_COMMENT;
                  commentCount++;
                  if (keepComments) {
                      addComment(stringVal);
                  }
              }
  
              if (token != Token.HINT && !isAllowComment()) {
                  throw new NotAllowCommentException();
              }
  
              return;
          }
  
          if (!isAllowComment()) {
              throw new NotAllowCommentException();
          }
  
          if (ch == '/' || ch == '-') {
              scanChar();
              bufPos++;
  
              for (; ; ) {
                  if (ch == '\r') {
                      if (charAt(pos + 1) == '\n') {
                          bufPos += 2;
                          scanChar();
                          break;
                      }
                      bufPos++;
                      break;
                  } else if (ch == EOI) {
                      break;
                  }
  
                  if (ch == '\n') {
                      scanChar();
                      bufPos++;
                      break;
                  }
  
                  scanChar();
                  bufPos++;
              }
  
              stringVal = subString(mark, ch != EOI ? bufPos : bufPos + 1);
              token = Token.LINE_COMMENT;
              commentCount++;
              if (keepComments) {
                  addComment(stringVal);
              }
              endOfComment = isEOF();
          }
      }
  
      public void scanNumber() {
          mark = pos;
  
          if (ch == '-') {
              bufPos++;
              ch = charAt(++pos);
          }
  
          while (ch >= '0' && ch <= '9') {
              bufPos++;
              ch = charAt(++pos);
          }
  
          boolean isDouble = false;
  
          if (ch == '.') {
              if (charAt(pos + 1) == '.') {
                  token = Token.LITERAL_INT;
                  return;
              }
              bufPos++;
              ch = charAt(++pos);
              isDouble = true;
  
              while (ch >= '0' && ch <= '9') {
                  bufPos++;
                  ch = charAt(++pos);
              }
          }
  
          if ((ch == 'e' || ch == 'E') && isDigit2(charAt(pos + 1))) {
              bufPos++;
              ch = charAt(++pos);
  
              if (ch == '+' || ch == '-') {
                  bufPos++;
                  ch = charAt(++pos);
              }
  
              while (ch >= '0' && ch <= '9') {
                  bufPos++;
                  ch = charAt(++pos);
              }
  
              isDouble = true;
          }
  
          if (ch == 'f' || ch == 'F') {
              token = Token.BINARY_FLOAT;
              scanChar();
              return;
          }
  
          if (ch == 'd' || ch == 'D') {
              token = Token.BINARY_DOUBLE;
              scanChar();
              return;
          }
  
          if (isDouble) {
              token = Token.LITERAL_FLOAT;
          } else {
              token = Token.LITERAL_INT;
          }
      }
  
      @Override
      protected void initDialectFeature() {
          this.dialectFeature = ORACLE_FEATURE;
      }
  }
  