DOM with Lua DataModel and dropped V8

1 files changed, 13 insertions, 1 deletions

diff --git a/src/uscxml/plugins/DataModelImpl.h b/src/uscxml/plugins/DataModelImpl.h
index e3db75a..b378a96 100644
--- a/src/uscxml/plugins/DataModelImpl.h
+++ b/src/uscxml/plugins/DataModelImpl.h
@@ -116,7 +116,8 @@ public:
 
 	/**
 	 * Determine whether a given string constitutes valid syntax in the
-	 * data-model's language.
+	 * data-model's language. This is only used to identify InterpreterIssues
+     * but may be useful to implement isLegalDataValue() as well.
 	 * @param expr A string, supposedly containing an expression of the data-model.
 	 * @return Whether expr is in L(DM).
 	 */
@@ -124,6 +125,17 @@ public:
 		return true; // overwrite when datamodel supports it
 	}
 
+    /**
+     * Determine whether a given string constitutes a legal data value that can appear
+     * at the right-hand side of an assignment.
+     *
+     * @param expr A string, supposedly containing a legal data value.
+     * @return Whether expr is a legal data value.
+     */
+    virtual bool isLegalDataValue(const std::string& expr) {
+        return true; // overwrite when datamodel supports it
+    }
+
 	/**
 	 * Set the given event as `_event` in the data-model's global scope.
 	 * @param event The event as it was dequeued from either the internal or external queue.