/**
* Obtains the semantic tags associated with all the elements of the rule
*
* @param rules HashMap with all the grammar rules that have been already parsed. It is used to
* solve references to other rules within the current one
* @return ArrayList with the semantic representations of all elements. It is composed of vectors
* containing 2 Strings: 0: text of the grammar element 1: its semantic interpretation
*/
public ArrayList<String[]> getSemanticTags(HashMap<String, Rule> rules) {
// Semantic tags
ArrayList<String[]> semanticTags = new ArrayList<String[]>(elements.size());
for (GrammarElement el : elements) {
if (el.getSemanticTags() != null) // Careful: addAll throws Exception if its argument is null
semanticTags.addAll(el.getSemanticTags());
// If the element is a rule reference, then the referred rule is solved and is semantic tags
// are added
if (el instanceof RuleReference) {
Rule referedRule = rules.get(((RuleReference) el).getRefId());
if (referedRule.getSemanticTags(rules) != null)
semanticTags.addAll(referedRule.getSemanticTags(rules));
}
}
if (semanticTags.isEmpty()) return null;
else return semanticTags;
}
/**
* Computes the regular expression corresponding to the rule by concatenating the expressions
* corresponding to its constituent elements.
*/
void setRegularExpression() {
for (GrammarElement element : elements) {
regularExpression += " " + element.getRegExpr();
}
}