From 40276dc66bffda2692096fb1facbc7cf44e18fde Mon Sep 17 00:00:00 2001
From: Charlie Stanton <charlie@shtanton.xyz>
Date: Fri, 21 Apr 2023 10:06:58 +0100
Subject: Add ^xyz^ as a shorthand for ="xyz"= in subex

---
 subex/parse.go | 25 ++++++++++++++++++-------
 1 file changed, 18 insertions(+), 7 deletions(-)

(limited to 'subex/parse.go')

diff --git a/subex/parse.go b/subex/parse.go
index 106663d..b403adc 100644
--- a/subex/parse.go
+++ b/subex/parse.go
@@ -166,7 +166,7 @@ func parseReplacement(l RuneReader) (output []OutputContent) {
 		switch r {
 			case eof:
 				panic("Missing closing \"")
-			case '=':
+			case '=', '^':
 				break loop
 			case '$':
 				slot := l.Next()
@@ -287,6 +287,23 @@ func parseSubex(l RuneReader, minPower int) SubexAST {
 		case '=':
 			replacement := parseReplacement(l)
 			lhs = SubexASTOutput{replacement}
+		case '`':
+			literals := parseNonStringLiteral(l)
+			lhs = SubexASTEmpty{}
+			for _, literal := range literals {
+				lhs = SubexASTConcat {lhs, SubexASTCopyAtom {literal}}
+			}
+		case '^':
+			replacement := parseReplacement(l)
+			replacement = append(
+				[]OutputContent{OutputAtomLiteral {walk.StringTerminal{}}},
+				replacement...
+			)
+			replacement = append(
+				replacement,
+				OutputAtomLiteral {walk.StringTerminal{}},
+			)
+			lhs = SubexASTOutput {replacement}
 		case '.':
 			lhs = SubexASTCopyAny{}
 		case '?':
@@ -301,12 +318,6 @@ func parseSubex(l RuneReader, minPower int) SubexAST {
 			lhs = SubexASTCopyValue{}
 		case '"':
 			lhs = SubexASTCopyAtom {walk.StringTerminal{}}
-		case '`':
-			literals := parseNonStringLiteral(l)
-			lhs = SubexASTEmpty{}
-			for _, literal := range literals {
-				lhs = SubexASTConcat {lhs, SubexASTCopyAtom {literal}}
-			}
 		case '~':
 			literals := parseNonStringLiteral(l)
 			var replacement []OutputContent
-- 
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