public RegexLexer parse(String rbnfCode) {
if (rbnfCode == null) {
throw new IllegalArgumentException("rbnfCode==null");
}
RBNFParser parser = new RBNFParser(rbnfCode);
RBNF rbnf = parser.parse();
if (rbnf == null) return null;
RegexLexer lexer = new RegexLexer();
List<Rule> rules = rbnf.getRules();
for (Rule r : rules) {
RegexTokenParser tokParser = rule(r, rbnf);
if (tokParser != null) {
lexer.getParsers().add(tokParser);
}
}
return lexer;
}
protected String id(Identifier id, RBNF rbnf) {
String sid = id.getMatchedText();
if (sid != null) {
Rule r = rbnf.getRuleById(sid);
if (r != null) {
TreeNode ex = r.getExpression();
if (ex != null) {
String s = expression(ex, rbnf);
return s;
}
}
if (sid.equals("any")) return ".";
if (sid.equals("letter")) return "\\p{Alpha}";
if (sid.equals("digit")) return "\\p{Digit}";
if (sid.equals("endl")) return "\\r?\\n";
if (sid.equals("ws")) return "\\s";
}
return null;
}