Refactor to split RuleCaseElement

The various types of RuleCaseElement are now their own things.

1 files changed, 48 insertions, 0 deletions

diff --git a/src/main/java/bjc/rgens/parser/elements/DependantRuleReference.java b/src/main/java/bjc/rgens/parser/elements/DependantRuleReference.java
new file mode 100644
index 0000000..5eccf8e
--- /dev/null
+++ b/src/main/java/bjc/rgens/parser/elements/DependantRuleReference.java
@@ -0,0 +1,48 @@
+package bjc.rgens.parser.elements;
+
+import bjc.rgens.parser.GrammarException;
+import bjc.rgens.parser.GenerationState;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class DependantRuleReference extends RuleCaseElement {
+	private static Pattern NAMEVAR_PATTERN = Pattern.compile("\\$(\\w+)");
+
+	public DependantRuleReference(String vl) {
+		super(vl, ReferenceType.DEPENDENT);
+	}
+
+	@Override
+	public void generate(GenerationState state) {
+		String refBody = val.substring(1, val.length() - 1);
+
+		/* 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);
+
+		doGenerate(String.format("[%s]", nameBuffer.toString()), state);
+	}
+}