From 1e66aaece6ea7cd3c705ca56ce5558e8f87681b8 Mon Sep 17 00:00:00 2001
From: Charlie Stanton <charlie@shtanton.xyz>
Date: Sun, 21 Apr 2024 17:16:01 +0100
Subject: Add substitute next commands

---
 subex/parse.go | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

(limited to 'subex')

diff --git a/subex/parse.go b/subex/parse.go
index d825f75..b6bf2f6 100644
--- a/subex/parse.go
+++ b/subex/parse.go
@@ -516,7 +516,14 @@ func parseSubex(l RuneReader, minPower int, inType Type) (lhs SubexAST, outType
 			lhs = SubexASTCopyNumber{}
 		case '`':
 			outType = inType
-			lhs = parseValueReplacement(l, '`')
+			switch inType {
+			case ValueType:
+				lhs = parseValueReplacement(l, '`')
+			case RuneType:
+				lhs = parseRuneReplacement(l, '`')
+			default:
+				panic("Invalid inType")
+			}
 		case ' ':
 			if inType == RuneType {
 				outType = RuneType
@@ -540,6 +547,7 @@ func parseSubex(l RuneReader, minPower int, inType Type) (lhs SubexAST, outType
 	loop: for {
 		if minPower <= 20 {
 			next, outType2 := parseSubex(l, 21, inType)
+			// TODO: next might legitimately be SubexASTEmpty, e.g. ``
 			if next != nil && (next != SubexASTEmpty{}) {
 				outType = resolveTypes(outType, outType2)
 				lhs = SubexASTConcat{lhs, next}
-- 
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