plugins/net.mograsim.plugin.core/src/net/mograsim/plugin/asm/editor/rules/AsmLabelRule.java

   1 package net.mograsim.plugin.asm.editor.rules;
   2
   3 import org.eclipse.core.runtime.Assert;
   4 import org.eclipse.jface.text.rules.ICharacterScanner;
   5 import org.eclipse.jface.text.rules.IRule;
   6 import org.eclipse.jface.text.rules.IToken;
   7 import org.eclipse.jface.text.rules.Token;
   8
   9 public class AsmLabelRule implements IRule
  10 {
  11
  12         /** The token to be returned when this rule is successful */
  13         protected IToken fToken;
  14
  15         /**
  16          * Creates a rule which will return the specified token when a numerical sequence is detected.
  17          *
  18          * @param token the token to be returned
  19          */
  20         public AsmLabelRule(IToken token)
  21         {
  22                 Assert.isNotNull(token);
  23                 fToken = token;
  24         }
  25
  26         @Override
  27         public IToken evaluate(ICharacterScanner scanner)
  28         {
  29                 int c = scanner.read();
  30                 int i = 1;
  31                 if (Character.isJavaIdentifierStart(c))
  32                 {
  33                         do
  34                         {
  35                                 c = scanner.read();
  36                                 i++;
  37                         } while (Character.isJavaIdentifierPart(c));
  38                         if (c == ':')
  39                                 return fToken;
  40                         return abort(scanner, i);
  41                 }
  42                 scanner.unread();
  43                 return Token.UNDEFINED;
  44         }
  45
  46         private static IToken abort(ICharacterScanner scanner, int i)
  47         {
  48                 for (int j = 0; j < i; j++)
  49                         scanner.unread();
  50                 return Token.UNDEFINED;
  51         }
  52 }