Add getAll() for full post-evaluation var access

Co-authored-by: Curtis Rueden <ctrueden@wisc.edu>

Author: JaredDavis22

pom.xml

@@ -10,7 +10,7 @@
 	</parent>
 
 	<artifactId>parsington</artifactId>
-	<version>3.1.1-SNAPSHOT</version>
+	<version>3.2.0-SNAPSHOT</version>
 
 	<name>Parsington: The SciJava Expression Parser</name>
 	<description>A general-purpose mathematical expression parser, which converts infix expression strings into postfix queues and/or syntax trees.</description>

src/main/java/org/scijava/parsington/eval/AbstractEvaluator.java

@@ -30,6 +30,7 @@
 
 package org.scijava.parsington.eval;
 
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.Map;
 
@@ -79,6 +80,11 @@ public Object get(final String name) {
 		return new Unresolved(name);
 	}
 
+	@Override
+	public Map<String, Object> getAll() {
+		return Collections.unmodifiableMap(vars);
+	}
+
 	@Override
 	public void set(final String name, final Object value) {
 		vars.put(name, value);

src/main/java/org/scijava/parsington/eval/Evaluator.java

@@ -167,6 +167,13 @@ default Object get(final Variable v) {
 		return get(v.getToken());
 	}
 
+	/**
+	 * Gets a map of all variable names and values.
+	 *
+	 * @return A map from variable names to variable values.
+	 */
+	Map<String, Object> getAll();
+
 	/**
 	 * Sets the value of a variable.
 	 *