public Start getStartSymbol(Nonterminal nt) {
Start start = Start.from(nt);
if (definitions.keySet().contains(start)) return start;
Rule startRule;
if (layout != null)
startRule =
Rule.withHead(start)
.setLabel("Start")
.addSymbol(layout)
.addSymbol(nt)
.addSymbol(layout)
.setRecursion(Recursion.NON_REC)
.setAssociativity(Associativity.UNDEFINED)
.setPrecedence(-1)
.setPrecedenceLevel(PrecedenceLevel.getFirstAndDone())
.build();
else
startRule =
Rule.withHead(start)
.addSymbol(nt)
.setRecursion(Recursion.NON_REC)
.setAssociativity(Associativity.UNDEFINED)
.setPrecedence(-1)
.setPrecedenceLevel(PrecedenceLevel.getFirstAndDone())
.build();
definitions.put(start, CollectionsUtil.list(startRule));
rules.add(startRule);
return start;
}
public Builder addRule(Rule rule) {
List<Rule> rules = definitions.get(rule.getHead());
if (rules == null) {
rules = new ArrayList<>();
definitions.put(rule.getHead(), rules);
}
rules.add(rule);
this.rules.add(rule);
return this;
}
public Builder addExceptPattern(ExceptPattern pattern) {
exceptPatterns.add(pattern);
return this;
}
public Builder addPrecedencePattern(PrecedencePattern pattern) {
precedencePatterns.add(pattern);
return this;
}