private static Pattern getPattern(
Map<String, NamedCondition> transitionConditions, PatternGroup patternGroup) {
Pattern pattern = new Pattern();
for (Step step : patternGroup.steps) {
Pattern next;
if (step.isPattern()) {
next = getPattern(transitionConditions, step.patternGroup);
} else {
NamedCondition condition = transitionConditions.get(step.ref);
if (condition == null)
throw new IllegalArgumentException("No such condition [" + step.ref + "]");
next = Pattern.match(condition);
}
if (step.repeat) next = next.repeat();
if (step.optional) next = next.optional();
next = Pattern.capture(next);
pattern =
patternGroup.type == GroupType.OR
? Pattern.branch(pattern, next)
: Pattern.chain(pattern, next);
}
return pattern.minimize();
}
