[news.eclipse.newcomer] Highlighting keywords problem

[no1999@xxxxxxxxx (Nir)]

Hello,
I'm trying to write an Editor Plug-in for FL language.

I manged to do the highlighting, but I have a problem with the keywords 
coloring.
it colors the keywords also when they have a prefix.

for example, "let" is a key word in FL :
let
bullet
in both these words the "let" sequence will be colored (i.e. bul<LET>).
(for words postfix, like "letx" it knows not to color them)


I use a simple WordRule for the scanner:
/***************/

WordRule wordRule = new WordRule(new IWordDetector() {
           public boolean isWordStart(char c) { 
           	return !Character.isWhitespace(c); 
           }
           public boolean isWordPart(char c) {
           	 return !(Character.isWhitespace(c) 
           	            || (c == ';') || (c == '('));
           }
        });

wordRule.addWord("let",keyword);
rules[1] = wordRule;

/***************/

I know the JavaEditor example can distinguish a prefix from a word,
but I can't see where it is defined.


any ideas ?