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package bjc.rgens.parser;
import bjc.rgens.parser.elements.CaseElement;
import bjc.utils.data.IPair;
import bjc.utils.funcdata.IList;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
/**
* @TODO Ben Culkin 9/8/18 :GrammarFormatter
*
* Update this to suppor the new features when possible.
*/
/**
* Format randomized grammars to strings properly.
*
* @author EVE
*/
public class RGrammarFormatter {
/**
* Format a grammar into a file that represents that grammar.
*
* @param gram
* The grammar to format.
*
* @return
* The formatted grammar.
*/
public static String formatGrammar(RGrammar gram) {
StringBuilder sb = new StringBuilder();
Map<String, Rule> rules = gram.getRules();
String initRuleName = gram.getInitialRule();
Set<String> processedRules = new HashSet<>();
if (initRuleName != null) {
processRule(rules.get(initRuleName), sb);
processedRules.add(initRuleName);
}
for (Rule rule : rules.values()) {
if (!processedRules.contains(rule.name)) {
sb.append("\n\n");
processRule(rule, sb);
}
processedRules.add(rule.name);
}
return sb.toString().trim();
}
/* Format a rule. */
private static void processRule(Rule rule, StringBuilder sb) {
IList<IPair<Integer, RuleCase>> cases = rule.getCases();
StringBuilder ruleBuilder = new StringBuilder();
ruleBuilder.append(rule.name);
ruleBuilder.append(" \u2192 ");
int markerPos = ruleBuilder.length();
processCase(cases.first().getRight(), ruleBuilder);
sb.append(ruleBuilder.toString().trim());
ruleBuilder = new StringBuilder();
for (IPair<Integer, RuleCase> cse : cases.tail()) {
sb.append("\n\t");
for (int i = 8; i < markerPos; i++) {
ruleBuilder.append(" ");
}
/* @TODO do this right, once we pick the syntax */
processCase(cse.getRight(), ruleBuilder);
sb.append(ruleBuilder.toString());
ruleBuilder = new StringBuilder();
}
}
/* Format a case. */
private static void processCase(RuleCase cse, StringBuilder sb) {
/* Process each element, adding a space. */
for (CaseElement element : cse.elementList) {
sb.append(element.toString());
sb.append(" ");
}
/* Remove the trailing space. */
sb.deleteCharAt(sb.length() - 1);
}
}
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