scanner.lex

有关JDBC的使用一些编程实例,有关与数据库连接的代码

import java.util.*;
import java.lang.*;
import java_cup.runtime.*;
import java.io.*;

%%

%{
static scanner foo;
public static void init(InputStream is) {
  foo = new scanner(is);
}

public static token next_token() throws java.io.IOException {
  return foo.yylex();
}
%}

%class scanner
%type token
%eofval{
return (new token(sym.EOF));
%eofval}

NAME=[A-Za-z][A-Za-z0-9_]*

WHITE_SPACE_CHAR=[\n\ \t\b\012]

INT_NUM = [0-9]+

QQSTRING = (\\\"|[^\n\"]|\\{WHITE_SPACE_CHAR}+\\)*

QSTRING = (\\\'|[^\n\']|\\{WHITE_SPACE_CHAR}+\\)*

CHARACTER = CHAR(ACTER)?

INTEGER = INT(EGER)?

COMPARISON = (=|<>|<|>|<=|>=)

%%

<YYINITIAL> ";" { return new token (sym.SEMI); }

<YYINITIAL> "," { return new token (sym.COMMA); }

<YYINITIAL> "." { return new token (sym.PERIOD); }

<YYINITIAL> "(" { return new token (sym.LPAREN); }

<YYINITIAL> ")" { return new token (sym.RPAREN); }

<YYINITIAL> "*" { return new token (sym.ASTERISK); }

<YYINITIAL> "AND" { return new token (sym.AND); }

<YYINITIAL> "WHERE" { return new token (sym.WHERE); }

<YYINITIAL> "INSERT" { return new token (sym.INSERT); }

<YYINITIAL> "UPDATE" { return new token (sym.UPDATE); }

<YYINITIAL> "DELETE" { return new token (sym.DELETE); }

<YYINITIAL> "SET" { return new token (sym.SET); }

<YYINITIAL> "VALUES" { return new token (sym.VALUES); }

<YYINITIAL> "INTO" { return new token (sym.INTO); }

<YYINITIAL> "SELECT" { return new token (sym.SELECT); }

<YYINITIAL> "FROM" { return new token (sym.FROM); }

<YYINITIAL> "TABLE" { return new token (sym.TABLE); }

<YYINITIAL> "CREATE" { return new token (sym.CREATE); }

<YYINITIAL> "NUMERIC" { return new token (sym.NUMERIC); }

<YYINITIAL> "DROP" { return new token (sym.DROP); }

<YYINITIAL> {INTEGER} { return new token (sym.INTEGER); }

<YYINITIAL> {CHARACTER} { return new token (sym.CHARACTER); }

<YYINITIAL> {NAME} { return new str_token (sym.NAME, yytext); }

<YYINITIAL> {COMPARISON} { return new str_token (sym.COMPARISON, yytext); }

<YYINITIAL> {WHITE_SPACE_CHAR} { }

<YYINITIAL> {INT_NUM} { return new str_token (sym.INT_NUM, yytext) ; }

<YYINITIAL> \"{QQSTRING}\" { return new str_token (sym.STRING, 
                            yytext.substring(1, yytext.length() - 1)) ; } 

<YYINITIAL> \'{QSTRING}\' { return new str_token (sym.STRING, 
                            yytext.substring(1, yytext.length() - 1)) ; }