From 2dd098d1e16bd0b8786ca97ccc7d3b06fa6bc3d1 Mon Sep 17 00:00:00 2001
From: Ryo Nihei <nihei.dev@gmail.com>
Date: Sun, 12 Jun 2022 00:40:28 +0900
Subject: Prohibit using a pattern in an alternative

When a syntax error occurs, the parser must provide a user with the names of expected tokens.
However, if a pattern appears directly in an alternative, Vartan cannot assign an appropriate name to the pattern.
Therefore, this commit prohibits alternatives from containing patterns.
---
 driver/parser_test.go | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

(limited to 'driver/parser_test.go')

diff --git a/driver/parser_test.go b/driver/parser_test.go
index 9e232f7..215988d 100644
--- a/driver/parser_test.go
+++ b/driver/parser_test.go
@@ -50,18 +50,20 @@ func TestParser_Parse(t *testing.T) {
 #name test;
 
 expr
-    : expr "\+" term
+    : expr '+' term
     | term
     ;
 term
-    : term "\*" factor
+    : term '*' factor
     | factor
     ;
 factor
-    : "\(" expr "\)"
+    : '(' expr ')'
     | id
     ;
-id: "[A-Za-z_][0-9A-Za-z_]*";
+
+id
+    : "[A-Za-z_][0-9A-Za-z_]*";
 `,
 			src: `(a+(b+c))*d+e`,
 			cst: nonTermNode("expr",
@@ -404,10 +406,10 @@ fragment words: "[A-Za-z\u{0020}]+";
 #name test;
 
 list
-    : "\[" elems "]" #ast elems...
+    : '[' elems ']' #ast elems...
     ;
 elems
-    : elems "," id #ast elems... id
+    : elems ',' id #ast elems... id
     | id
     ;
 
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