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package bjc.rgens.parser.elements;
import bjc.rgens.parser.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class RuleCaseElement extends StringCaseElement {
private static Pattern NAMEVAR_PATTERN = Pattern.compile("\\$(\\w+)");
public RuleCaseElement(String vl) {
super(vl, false);
}
@Override
public void generate(GenerationState state) {
/*
* @NOTE
*
* :VarRefactor
*
* Figure out if this can be refactored in some way.
*/
String refersTo = val;
GenerationState newState = state.newBuf();
if (refersTo.contains("$")) {
/* Parse variables */
String refBody = refersTo.substring(1, refersTo.length() - 1);
if (refBody.contains("-")) {
/* Handle dependent rule names. */
StringBuffer nameBuffer = new StringBuffer();
Matcher nameMatcher = NAMEVAR_PATTERN.matcher(refBody);
while (nameMatcher.find()) {
String var = nameMatcher.group(1);
if (!state.vars.containsKey(var)) {
String msg = String.format("No variable '%s' defined", var);
throw new GrammarException(msg);
}
String name = state.vars.get(var);
if (name.contains(" ")) {
throw new GrammarException("Variables substituted into names cannot contain spaces");
} else if (name.equals("")) {
throw new GrammarException("Variables substituted into names cannot be empty");
}
nameMatcher.appendReplacement(nameBuffer, name);
}
nameMatcher.appendTail(nameBuffer);
refersTo = "[" + nameBuffer.toString() + "]";
} else {
/* Handle string references. */
if (refBody.equals("$")) {
throw new GrammarException("Cannot refer to unnamed variables");
}
String key = refBody.substring(1);
if (!state.vars.containsKey(key)) {
String msg = String.format("No variable '%s' defined", key);
throw new GrammarException(msg);
}
state.contents.append(state.vars.get(key));
return;
}
}
if (refersTo.startsWith("[^")) {
refersTo = "[" + refersTo.substring(2);
RGrammar dst = state.importRules.get(refersTo);
newState.swapGrammar(dst);
/* :Postprocessing */
newState.contents = new StringBuilder(dst.generate(refersTo, state.rnd, state.vars));
} else if (state.rules.containsKey(refersTo)) {
RuleCase cse = state.rules.get(refersTo).getCase(state.rnd);
state.gram.generateCase(cse, newState);
} else if (state.importRules.containsKey(refersTo)) {
RGrammar dst = state.importRules.get(refersTo);
newState.swapGrammar(dst);
/* :Postprocessing */
newState.contents = new StringBuilder(dst.generate(refersTo, state.rnd, state.vars));
} else {
/*
* @TODO 5/29/18 Ben Culkin :RuleSuggesting
*
* Re-get this working again.
*/
/*
if (ruleSearcher != null) {
Set<Match<? extends String>> results = ruleSearcher.search(refersTo, MAX_DISTANCE);
String[] resArray = results.stream().map(Match::getMatch).toArray((i) -> new String[i]);
String msg = String.format("No rule '%s' defined (perhaps you meant %s?)", refersTo,
StringUtils.toEnglishList(resArray, false));
throw new GrammarException(msg);
}
*/
String msg = String.format("No rule '%s' defined", refersTo);
throw new GrammarException(msg);
}
if (refersTo.contains("+")) {
/* Rule names with pluses in them get space-flattened */
state.contents.append(newState.contents.toString().replaceAll("\\s+", ""));
} else {
state.contents.append(newState.contents.toString());
}
}
}
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