Scaffolding for the VariableStrings which doesn't do anything yet - would need to parse the strings and match against them in the matchers

Implement part of the SemgrexParser part of the variableGroups change.  Unfortunately, it is not correct until we process one matcher per regex rather than trying to keep one matcher for all the attributes

Author: AngledLuffa

src/edu/stanford/nlp/semgraph/semgrex/NodePattern.java

@@ -49,15 +49,8 @@ public class NodePattern extends SemgrexPattern  {
   SemgrexPattern child;
   // specifies the groups in a regex that are captured as
   // matcher-global string variables
-  private List<Pair<Integer, String>> variableGroups;
+  private final List<Pair<Integer, String>> variableGroups;
 
-  public NodePattern(GraphRelation r, boolean negDesc,
-                     NodeAttributes attrs, boolean isLink, String name) {
-    this(r, negDesc, attrs, isLink, name,
-            new ArrayList<>(0));
-  }
-
-  // TODO: there is no capacity for named variable groups in the parser right now
   public NodePattern(GraphRelation r, boolean negDesc,
                      NodeAttributes attrs, boolean isLink, String name,
                      List<Pair<Integer, String>> variableGroups) {
@@ -586,6 +579,9 @@ private void goToNextNodeMatch() {
             edgeNamedFirst = true;
           namesToEdges.put(myNode.reln.getEdgeName(), nextMatchEdge);
         }
+        // TODO FIXME: this would need to read all of the matchers used
+        // (eg, from the various attributes)
+        // and commit all of them
         commitVariableGroups(m); // commit my variable groups.
       }
       // finished is false exiting this if and only if nextChild exists
@@ -595,7 +591,11 @@ private void goToNextNodeMatch() {
 
     private void commitVariableGroups(Matcher m) {
       committedVariables = true; // commit all my variable groups.
+      if (myNode.variableGroups.size() > 0) {
+        System.out.println(myNode.variableGroups);
+      }
       for (Pair<Integer, String> varGroup : myNode.variableGroups) {
+        System.out.println(varGroup);
         String thisVarString = m.group(varGroup.first());
         variableStrings.setVar(varGroup.second(), thisVarString);
       }

src/edu/stanford/nlp/semgraph/semgrex/SemgrexMatch.java

@@ -81,6 +81,10 @@ public SemanticGraphEdge getEdge(String name) {
     return namesToEdges.get(name);
   }
 
+  public String getVariableString(String var) {
+    return variableStrings.getString(var);
+  }
+
   public String toString() {
     StringBuilder builder = new StringBuilder();
     builder.append(matchedPattern);

src/edu/stanford/nlp/semgraph/semgrex/SemgrexMatcher.java

@@ -77,6 +77,7 @@ public void reset() {
     namesToNodes.clear();
     namesToRelations.clear();
     namesToEdges.clear();
+    variableStrings.reset();
   }
 
   /**