Refactor case element generation

Case elements are now responsible for generating themselves.

1 files changed, 122 insertions, 0 deletions

diff --git a/src/main/java/bjc/rgens/parser/elements/RuleCaseElement.java b/src/main/java/bjc/rgens/parser/elements/RuleCaseElement.java
index f4d3512..d91bebc 100755
--- a/src/main/java/bjc/rgens/parser/elements/RuleCaseElement.java
+++ b/src/main/java/bjc/rgens/parser/elements/RuleCaseElement.java
@@ -1,7 +1,129 @@
 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());
+		}
+	}
 }