package com.chenyang.druid.sql.dialect.db2.parser;

import com.chenyang.druid.DbType;
import com.chenyang.druid.sql.parser.CharTypes;
import com.chenyang.druid.sql.parser.Keywords;
import com.chenyang.druid.sql.parser.Lexer;
import com.chenyang.druid.sql.parser.ParserException;
import com.chenyang.druid.sql.parser.SQLParserFeature;
import com.chenyang.druid.sql.parser.Token;
import java.util.HashMap;
import java.util.Map;

public class DB2Lexer extends Lexer {
   public static final Keywords DEFAULT_GP_KEYWORDS;

   public DB2Lexer(String input, SQLParserFeature... features) {
      super(input, true);
      this.keepComments = true;
      super.keywords = DEFAULT_GP_KEYWORDS;
      super.dbType = DbType.db2;

      for(SQLParserFeature feature : features) {
         this.config(feature, true);
      }

   }

   protected void scanString() {
      this.mark = this.pos;
      boolean hasSpecial = false;

      while(!this.isEOF()) {
         this.ch = this.charAt(++this.pos);
         if (this.ch == '\\') {
            this.scanChar();
            if (!hasSpecial) {
               this.initBuff(this.bufPos);
               this.arraycopy(this.mark + 1, this.buf, 0, this.bufPos);
               hasSpecial = true;
            }

            this.putChar('\\');
            switch (this.ch) {
               case '\u0000':
                  this.putChar('\u0000');
                  break;
               case '"':
                  this.putChar('"');
                  break;
               case '\'':
                  this.putChar('\'');
                  break;
               case 'Z':
                  this.putChar('\u001a');
                  break;
               case '\\':
                  this.putChar('\\');
                  break;
               case 'b':
                  this.putChar('b');
                  break;
               case 'n':
                  this.putChar('n');
                  break;
               case 'r':
                  this.putChar('r');
                  break;
               case 't':
                  this.putChar('t');
                  break;
               default:
                  this.putChar(this.ch);
            }

            this.scanChar();
         }

         if (this.ch == '\'') {
            this.scanChar();
            if (this.ch != '\'') {
               this.token = Token.LITERAL_CHARS;
               if (!hasSpecial) {
                  this.stringVal = this.subString(this.mark + 1, this.bufPos);
               } else {
                  this.stringVal = new String(this.buf, 0, this.bufPos);
               }

               return;
            }

            if (!hasSpecial) {
               this.initBuff(this.bufPos);
               this.arraycopy(this.mark + 1, this.buf, 0, this.bufPos);
               hasSpecial = true;
            }

            this.putChar('\'');
         } else if (!hasSpecial) {
            ++this.bufPos;
         } else if (this.bufPos == this.buf.length) {
            this.putChar(this.ch);
         } else {
            this.buf[this.bufPos++] = this.ch;
         }
      }

      this.lexError("unclosed.str.lit", new Object[0]);
   }

   public void scanSharp() {
      this.scanChar();
      if (this.ch == '>') {
         this.scanChar();
         if (this.ch == '>') {
            this.scanChar();
            this.token = Token.POUNDGTGT;
         } else {
            this.token = Token.POUNDGT;
         }
      } else {
         this.token = Token.POUND;
      }

   }

   protected void scanVariable_at() {
      if (this.ch != '@') {
         throw new ParserException("illegal variable. " + this.info());
      } else {
         this.mark = this.pos;
         this.bufPos = 1;
         char c1 = this.charAt(this.pos + 1);
         if (c1 == '@') {
            this.pos += 2;
            this.token = Token.MONKEYS_AT_AT;
            this.ch = this.charAt(++this.pos);
         } else if (c1 == '>') {
            this.pos += 2;
            this.token = Token.MONKEYS_AT_GT;
            this.ch = this.charAt(++this.pos);
         } else {
            while(true) {
               char ch = this.charAt(++this.pos);
               if (!CharTypes.isIdentifierChar(ch)) {
                  this.ch = this.charAt(this.pos);
                  this.stringVal = this.addSymbol();
                  this.token = Token.VARIANT;
                  return;
               }

               ++this.bufPos;
            }
         }
      }
   }

   static {
      Map<String, Token> map = new HashMap();
      map.putAll(Keywords.DEFAULT_KEYWORDS.getKeywords());
      map.put("BEGIN", Token.BEGIN);
      map.put("CASCADE", Token.CASCADE);
      map.put("CONTINUE", Token.CONTINUE);
      map.put("FETCH", Token.FETCH);
      map.put("FIRST", Token.FIRST);
      map.put("IDENTITY", Token.IDENTITY);
      map.put("LIMIT", Token.LIMIT);
      map.put("NEXT", Token.NEXT);
      map.put("NOWAIT", Token.NOWAIT);
      map.put("OF", Token.OF);
      map.put("OFFSET", Token.OFFSET);
      map.put("ONLY", Token.ONLY);
      map.put("RECURSIVE", Token.RECURSIVE);
      map.put("RESTART", Token.RESTART);
      map.put("RESTRICT", Token.RESTRICT);
      map.put("RETURNING", Token.RETURNING);
      map.put("ROW", Token.ROW);
      map.put("ROWS", Token.ROWS);
      map.put("SHARE", Token.SHARE);
      map.put("SHOW", Token.SHOW);
      map.put("START", Token.START);
      map.put("USING", Token.USING);
      map.put("WINDOW", Token.WINDOW);
      map.put("TRUE", Token.TRUE);
      map.put("FALSE", Token.FALSE);
      map.put("ARRAY", Token.ARRAY);
      map.put("IF", Token.IF);
      map.put("TYPE", Token.TYPE);
      map.put("ILIKE", Token.ILIKE);
      map.put("MERGE", Token.MERGE);
      map.put("MATCHED", Token.MATCHED);
      map.put("PARTITION", Token.PARTITION);
      map.put("RESET", Token.RESET);
      map.put("BY", Token.BY);
      map.put("CACHE", Token.CACHE);
      map.put("TEMPORARY", Token.TEMPORARY);
      map.put("TEMP", Token.TEMP);
      map.put("UNLOGGED", Token.UNLOGGED);
      map.put("CONSTRAINT", Token.CONSTRAINT);
      map.put("PURGE", Token.PURGE);
      map.put("SESSION", Token.SESSION);
      map.put("VACUUM", Token.VACUUM);
      map.put("DOMAIN", Token.DOMAIN);
      map.put("COMMIT", Token.COMMIT);
      map.put("ROLE", Token.ROLE);
      map.put("EXECUTE", Token.EXECUTE);
      map.put("PROCEDURE", Token.PROCEDURE);
      DEFAULT_GP_KEYWORDS = new Keywords(map);
   }
}
