Adding JSONTokener.back() just before throwing JSONException

This forces JSONTokener.syntaxError(..) to point to the last character of the duplicate key.
stitchdata · Aug 10, 2017 · 7d83534 · 7d83534
1 parent 7fed023
commit 7d83534
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/JSONObject.java b/JSONObject.java
@@ -232,12 +232,13 @@ public JSONObject(JSONTokener x) throws JSONException {
                 throw x.syntaxError("Expected a ':' after a key");
             }
 
-            // Replace: this.putOnce(key, x.nextValue());
             // Use syntaxError(..) to include error location
 
             if (key != null) {
                 // Check if key exists
             	if (this.opt(key) != null) {
+            		// back one token to point to the last key character
+            		x.back();
                     throw x.syntaxError("Duplicate key \"" + key + "\"");
             	}
                 // Only add value if non-null