Added variable definitions to the context

src/main/java/fr/insarennes/nperier/minichamo/parsing/Context.java

 package fr.insarennes.nperier.minichamo.parsing;
 
+import fr.insarennes.nperier.minichamo.language.assignement.VariableDef;
 import fr.insarennes.nperier.minichamo.language.typing.Type;
 
 import java.util.HashMap;
@@ -8,17 +9,20 @@ import java.util.Map;
 public class Context {
 
     private final Map<String, Type> userTypes;
+    private final Map<String, VariableDef> variables;
 
     public Context() {
         userTypes = new HashMap<>();
+        variables = new HashMap<>();
     }
 
-    private Context(Map<String, Type> ut) {
+    private Context(Map<String, Type> ut, Map<String, VariableDef> vars) {
         userTypes = new HashMap<>(ut);
+        variables = new HashMap<>(vars);
     }
 
     public Context duplicate() {
-        return new Context(userTypes);
+        return new Context(userTypes, variables);
     }
 
     public boolean hasUserType(String typename) {
@@ -36,4 +40,19 @@ public class Context {
         return userTypes.get(typename);
     }
 
+    public boolean hasVariable(String varname) {
+        return variables.containsKey(varname);
+    }
+
+    public VariableDef getVariable(String varname) {
+        return variables.get(varname);
+    }
+
+    public void addVariable(VariableDef var) {
+        String name = var.getName();
+        if(!"()".equals(name) && !name.startsWith("_")) {
+            variables.put(name, var);
+        }
+    }
+
 }