From cf4f53332e9d99a3a9eccfe69e70f98769862c3a Mon Sep 17 00:00:00 2001
From: Ryo Nihei <nihei.dev@gmail.com>
Date: Wed, 22 Sep 2021 23:36:19 +0900
Subject: Keep the order of AST nodes constant

---
 compiler/compiler.go | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

(limited to 'compiler/compiler.go')

diff --git a/compiler/compiler.go b/compiler/compiler.go
index 0c89737..3469044 100644
--- a/compiler/compiler.go
+++ b/compiler/compiler.go
@@ -201,8 +201,19 @@ func compile(entries []*spec.LexEntry, modeName2ID map[spec.LexModeName]spec.Lex
 	var root astNode
 	var symTab *symbolTable
 	{
+		pats := make([]*patternEntry, len(patterns)+1)
+		pats[spec.LexModeKindIDNil] = &patternEntry{
+			id: spec.LexModeKindIDNil,
+		}
+		for id, pattern := range patterns {
+			pats[id] = &patternEntry{
+				id:      id,
+				pattern: pattern,
+			}
+		}
+
 		var err error
-		root, symTab, err = parse(patterns, fragmentPatterns)
+		root, symTab, err = parse(pats, fragmentPatterns)
 		if err != nil {
 			return nil, err
 		}
-- 
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