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   1 package net.sourceforge.phpdt.sql.editors;
   2
   3 import java.util.ArrayList;
   4 import java.util.HashMap;
   5 import java.util.List;
   6
   7 import org.eclipse.jface.text.IDocument;
   8 import org.eclipse.jface.text.rules.EndOfLineRule;
   9 import org.eclipse.jface.text.rules.ICharacterScanner;
  10 import org.eclipse.jface.text.rules.IPredicateRule;
  11 import org.eclipse.jface.text.rules.IRule;
  12 import org.eclipse.jface.text.rules.IToken;
  13 import org.eclipse.jface.text.rules.IWhitespaceDetector;
  14 import org.eclipse.jface.text.rules.MultiLineRule;
  15 import org.eclipse.jface.text.rules.RuleBasedPartitionScanner;
  16 import org.eclipse.jface.text.rules.SingleLineRule;
  17 import org.eclipse.jface.text.rules.Token;
  18 import org.eclipse.jface.text.rules.WhitespaceRule;
  19
  20 public class SQLPartitionScanner extends RuleBasedPartitionScanner {
  21         public final static String SQL_COMMENT = "__sql_comment";
  22         public final static String SQL_IDENTIFIER = "__sql_word";
  23         public final static String SQL_STRING = "__sql_string";
  24         public final static String SQL_KEYWORD = "__sql_keyword";
  25         public final static String SQL_SYMBOL = "__sql_symbol";
  26         public final static String SQL_SEPARATOR = "__sql_separator";
  27         public final static String SQL_NUMERIC = "__sql_numeric";
  28
  29         private final static String[] KEYWORDS = {
  30                 "ALTER",
  31                 "AND",
  32                 "BY",
  33                 "COLUMN",
  34                 "CREATE",
  35                 "DELETE",
  36                 "DROP",
  37                 "FROM",
  38                 "GROUP",
  39                 "INSERT",
  40                 "INTO",
  41                 "NOT",
  42                 "NULL",
  43                 "OR",
  44                 "ORDER",
  45                 "SELECT",
  46                 "SEQUENCE",
  47                 "SET",
  48                 "TABLE",
  49                 "UNION",
  50                 "UNIQUE",
  51                 "UPDATE",
  52                 "USING",
  53                 "VALUES",
  54                 "VIEW",
  55                 "WHEN",
  56                 "WHERE"
  57         };
  58
  59         public SQLPartitionScanner() {
  60
  61                 List rules = new ArrayList();
  62
  63                 IToken comment = new Token(SQL_COMMENT);
  64                 IToken string = new Token(SQL_STRING);
  65                 IToken identifier = new Token(SQL_IDENTIFIER);
  66                 IToken keyword = new Token(SQL_KEYWORD);
  67                 IToken separator = new Token(SQL_SEPARATOR);
  68                 IToken symbol = new Token(SQL_SYMBOL);
  69                 IToken whitespace = new Token(IDocument.DEFAULT_CONTENT_TYPE);
  70                 IToken numeric = new Token(SQL_NUMERIC);
  71
  72                 rules.add(new PredicateRuleAdapter(new WhitespaceRule(new WhitespaceDetector()), whitespace));
  73                 rules.add(new MultiLineRule("/*", "*/", comment));
  74                 rules.add(new EndOfLineRule("--", comment));
  75                 rules.add(new SingleLineRule("'", "'", string));
  76                 rules.add(new PredicateRuleAdapter(new SQLNumberRule(numeric), numeric));
  77                 SQLWordRule wordRule = new SQLWordRule(identifier);
  78                 for (int i = 0; i < KEYWORDS.length; i++) {
  79                         wordRule.addKeyword(KEYWORDS[i], keyword);
  80                 }
  81                 rules.add(new PredicateRuleAdapter(wordRule, keyword));
  82                 rules.add(new PredicateRuleAdapter(wordRule, identifier));
  83                 rules.add(new PredicateRuleAdapter(new SQLSeparatorRule(separator), separator));
  84                 rules.add(new PredicateRuleAdapter(new SymbolRule(symbol), symbol));
  85
  86                 IPredicateRule[] result= new IPredicateRule[rules.size()];
  87                 rules.toArray(result);
  88                 setPredicateRules(result);
  89         }
  90 }
  91
  92 class PredicateRuleAdapter implements IPredicateRule {
  93         IRule rule;
  94         IToken token;
  95         public PredicateRuleAdapter(IRule rule, IToken token) {
  96                 this.rule = rule;
  97                 this.token = token;
  98         }
  99
 100         public IToken evaluate(ICharacterScanner scanner, boolean resume) {
 101                 return rule.evaluate(scanner);
 102         }
 103
 104         public IToken getSuccessToken() {
 105                 return token;
 106         }
 107
 108         public IToken evaluate(ICharacterScanner scanner) {
 109                 return rule.evaluate(scanner);
 110         }
 111
 112 }
 113
 114 class SQLSeparatorRule implements IRule {
 115         IToken token;
 116         public SQLSeparatorRule(IToken token) {
 117                 this.token = token;
 118         }
 119         public IToken evaluate(ICharacterScanner scanner) {
 120                 char c = (char) scanner.read();
 121                 if (c == ';') {
 122                         return token;
 123                 }
 124                 scanner.unread();
 125                 return Token.UNDEFINED;
 126         }
 127
 128 }
 129
 130 class SymbolRule implements IRule {
 131         IToken token;
 132         public SymbolRule(IToken token) {
 133                 this.token = token;
 134         }
 135         public IToken evaluate(ICharacterScanner scanner) {
 136                 int val = scanner.read();
 137                 if (val != scanner.EOF) {
 138                         char c = (char) val;
 139                         if (!Character.isWhitespace(c) && !Character.isLetterOrDigit(c) && c != '_') {
 140                                 return token;
 141                         }
 142                 }
 143                 scanner.unread();
 144                 return Token.UNDEFINED;
 145         }
 146
 147 }
 148
 149 class WhitespaceDetector implements IWhitespaceDetector {
 150
 151         public boolean isWhitespace(char c) {
 152                 return Character.isWhitespace(c);
 153         }
 154 }
 155
 156 class SQLNumberRule implements IRule {
 157         private IToken token;
 158
 159         public SQLNumberRule(IToken token) {
 160                 this.token = token;
 161         }
 162
 163         public IToken evaluate(ICharacterScanner scanner) {
 164                 char c = (char) scanner.read();
 165                 if (Character.isDigit(c)) {
 166                         // postive numbers and zero
 167                         do {
 168                                 c= (char) scanner.read();
 169                         } while (Character.isDigit(c) || c == '.');
 170                         scanner.unread();
 171                         return token;
 172                 } else if (c == '-') {
 173                         // negative numbers
 174                         c = (char) scanner.read();
 175                         if (Character.isDigit(c)) {
 176                                 do {
 177                                         c= (char) scanner.read();
 178                                 } while (Character.isDigit(c) || c == '.');
 179                                 scanner.unread();
 180                                 return token;
 181                         } else {
 182                                 scanner.unread();
 183                                 scanner.unread();
 184                                 return Token.UNDEFINED;
 185                         }
 186                 } else {
 187                         scanner.unread();
 188                         return Token.UNDEFINED;
 189                 }
 190         }
 191 }
 192
 193 class SQLWordRule implements IRule {
 194         private IToken token;
 195         private HashMap keywords = new HashMap();
 196
 197         public SQLWordRule(IToken token) {
 198                 this.token = token;
 199         }
 200
 201         public void addKeyword(String word, IToken token) {
 202                 keywords.put(word.toUpperCase(), token);
 203         }
 204
 205         public IToken evaluate(ICharacterScanner scanner) {
 206                 char c = (char) scanner.read();
 207                 if (Character.isLetter(c) || c == '_') {
 208                         StringBuffer value = new StringBuffer();
 209                         do {
 210                                 value.append(c);
 211                                 c= (char) scanner.read();
 212                         } while (Character.isLetterOrDigit(c) || c == '_');
 213                         scanner.unread();
 214                         IToken retVal = (IToken) keywords.get(value.toString().toUpperCase());
 215                         if (retVal != null) {
 216                                 return retVal;
 217                         } else {
 218                                 return token;
 219                         }
 220                 } else {
 221                         scanner.unread();
 222                         return Token.UNDEFINED;
 223                 }
 224         }
 225 }