From 3cb64a2536dabcb89f449e81fa5453e528ecd446 Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Tue, 6 Jun 2023 20:05:58 +0100
Subject: Only allow positional args before named args

---
 .../shedlang/compiler/parser/ParserCallTests.java  | 32 ++++++++++++++++++++++
 1 file changed, 32 insertions(+)

(limited to 'src/test/java')

diff --git a/src/test/java/org/shedlang/compiler/parser/ParserCallTests.java b/src/test/java/org/shedlang/compiler/parser/ParserCallTests.java
index 1020b430..d75c6643 100644
--- a/src/test/java/org/shedlang/compiler/parser/ParserCallTests.java
+++ b/src/test/java/org/shedlang/compiler/parser/ParserCallTests.java
@@ -2,6 +2,7 @@ package org.shedlang.compiler.parser;
 
 import org.junit.jupiter.api.Test;
 
+import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.shedlang.compiler.ast.UntypedNodeMatchers.*;
 import static org.shedlang.compiler.parser.ParserTesting.parseString;
 import static org.zwobble.precisely.AssertThat.assertThat;
@@ -120,6 +121,37 @@ public class ParserCallTests {
         );
     }
 
+    @Test
+    public void canParseNamedArgumentAfterPositionalArgument() {
+        var source = "f(a, .named = b)";
+
+        var node = parseString(source, Parser::parseTopLevelExpression);
+
+        assertThat(
+            node,
+            isUntypedCallNode()
+                .withArgs(
+                    isUntypedArgsNode()
+                        .withPositional(isSequence(
+                            isUntypedReferenceNode("a")
+                        ))
+                        .withNamed(isSequence(
+                            isUntypedNamedArgNode("named", isUntypedReferenceNode("b"))
+                        ))
+                )
+        );
+    }
+
+    @Test
+    public void cannotParsePositionalArgumentAfterNamedArgument() {
+        var source = "f(.y = false, true)";
+
+        assertThrows(
+            PositionalArgAfterNamedArgError.class,
+            () -> parseString(source, Parser::parseTopLevelExpression)
+        );
+    }
+
     @Test
     public void argumentListCanHaveTrailingComma() {
         var source = "f(a,)";
-- 
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