From 120ce84bbfcdcde3213b3894af258a9814870606 Mon Sep 17 00:00:00 2001
From: Alex Walker <alex@grakn.ai>
Date: Wed, 21 Jul 2021 13:19:57 +0100
Subject: [PATCH] Fix error messages being duplicated

---
 common/exception/ErrorMessage.java | 2 +-
 parser/ErrorListener.java          | 4 ++++
 parser/Parser.java                 | 1 +
 3 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/common/exception/ErrorMessage.java b/common/exception/ErrorMessage.java
index fa856eb..3f248bb 100644
--- a/common/exception/ErrorMessage.java
+++ b/common/exception/ErrorMessage.java
@@ -105,7 +105,7 @@ public class ErrorMessage extends com.vaticle.typedb.common.exception.ErrorMessa
             new ErrorMessage(40, "'%s' is not a valid Type label. Type labels must start with a letter, and may contain only letters, numbers, '-' and '_'.");
 
 
-    private static final String codePrefix = "GQL";
+    private static final String codePrefix = "TQL";
     private static final String messagePrefix = "TypeQL Error";
 
     public ErrorMessage(int codeNumber, String messageBody) {
diff --git a/parser/ErrorListener.java b/parser/ErrorListener.java
index 8e2bb61..a29889c 100644
--- a/parser/ErrorListener.java
+++ b/parser/ErrorListener.java
@@ -74,6 +74,10 @@ public boolean hasErrors() {
         return !errors.isEmpty();
     }
 
+    public void clearErrors() {
+        errors.clear();
+    }
+
     @Override
     public String toString() {
         return errors.stream().map(SyntaxError::toString).collect(Collectors.joining("\n"));
diff --git a/parser/Parser.java b/parser/Parser.java
index cf6adc9..929de26 100644
--- a/parser/Parser.java
+++ b/parser/Parser.java
@@ -136,6 +136,7 @@ private <CONTEXT extends ParserRuleContext, RETURN> RETURN parse(
             // DefaultErrorStrategy + LL_EXACT_AMBIG_DETECTION
             // This was not set to default parsing strategy, but it is useful
             // to produce detailed/useful error message
+            errorListener.clearErrors();
             parser.setErrorHandler(new DefaultErrorStrategy());
             parser.getInterpreter().setPredictionMode(PredictionMode.LL_EXACT_AMBIG_DETECTION);
             queryContext = parserMethod.apply(parser);