From 44c5809b8c3af1be85d97673cc5a9585a65ef8f0 Mon Sep 17 00:00:00 2001
From: Charlie Stanton <charlie@shtanton.xyz>
Date: Thu, 20 Apr 2023 13:57:09 +0100
Subject: Remove the @, ~ and # syntax for terminal literals

---
 subex/parse.go | 30 ------------------------------
 1 file changed, 30 deletions(-)

diff --git a/subex/parse.go b/subex/parse.go
index b1d54ac..1e5e36e 100644
--- a/subex/parse.go
+++ b/subex/parse.go
@@ -33,20 +33,6 @@ func expectBracket(l RuneReader, ifLeft walk.Atom, ifRight walk.Atom) walk.Atom
 	}
 }
 
-// Having just read termType, read in a bracket and return the corresponding Atom
-func parseTerminatorAtomLiteral(termType rune, l RuneReader) walk.Atom {
-	switch termType {
-		case '@':
-			return expectBracket(l, walk.ArrayBegin, walk.ArrayEnd)
-		case '~':
-			return expectBracket(l, walk.StringTerminal{}, walk.StringTerminal{})
-		case '#':
-			return expectBracket(l, walk.MapBegin, walk.MapEnd)
-		default:
-			return nil
-	}
-}
-
 func isNumericRune(r rune) bool {
 	return '0' <= r && r <= '9' || r == '.'
 }
@@ -186,8 +172,6 @@ func parseReplacement(l RuneReader) (output []OutputContent) {
 					panic("Missing slot character")
 				}
 				output = append(output, OutputLoad{slot: slot})
-			case '@', '~', '#':
-				output = append(output, OutputAtomLiteral{atom: parseTerminatorAtomLiteral(r, l)})
 			case '`':
 				literals := parseNonStringLiteral(l)
 				for _, literal := range literals {
@@ -223,12 +207,6 @@ func parseRangeSubex(l RuneReader) map[walk.Atom]walk.Atom {
 		} else if fromsStart == '"' {
 			froms = append(froms, walk.StringTerminal{})
 			continue
-		} else {
-			atom := parseTerminatorAtomLiteral(fromsStart, l)
-			if atom != nil {
-				froms = append(froms, atom)
-				continue
-			}
 		}
 		if accept(l, "-") {
 			fromsEnd := l.Next()
@@ -260,12 +238,6 @@ func parseRangeSubex(l RuneReader) map[walk.Atom]walk.Atom {
 			} else if tosStart == '"' {
 				tos = append(tos, walk.StringTerminal{})
 				continue
-			} else {
-				atom := parseTerminatorAtomLiteral(tosStart, l)
-				if atom != nil {
-					tos = append(tos, atom)
-					continue
-				}
 			}
 			if accept(l, "-") {
 				tosEnd := l.Next()
@@ -317,8 +289,6 @@ func parseSubex(l RuneReader, minPower int) SubexAST {
 			lhs = SubexASTCopyAny{}
 		case '"':
 			lhs = SubexASTCopyAtom {walk.StringTerminal{}}
-		case '@', '#', '~':
-			lhs = SubexASTCopyAtom{atom: parseTerminatorAtomLiteral(r, l)}
 		case '`':
 			literals := parseNonStringLiteral(l)
 			lhs = SubexASTEmpty{}
-- 
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