From b2d1d965dee8cc2c1e063067d53a3c8e28a46d6c Mon Sep 17 00:00:00 2001
From: Charlie Stanton <charlie@shtanton.xyz>
Date: Sat, 24 Dec 2022 10:04:42 +0000
Subject: Adds the character range mapping syntax

Ranges of characters can be mapped with []

For example, capitalisation of a letter: [a-z=A-Z]
Caesar cipher shift of 1: [a-zA-Z=b-zaB-ZA]
---
 main/subexstate.go | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

(limited to 'main/subexstate.go')

diff --git a/main/subexstate.go b/main/subexstate.go
index 00b9e75..880be38 100644
--- a/main/subexstate.go
+++ b/main/subexstate.go
@@ -123,3 +123,23 @@ func (state SubexCopyAnyState) eat(store Store, char rune) []SubexBranch {
 func (state SubexCopyAnyState) accepting(store Store) []string {
 	return nil
 }
+
+type SubexRangeState struct {
+	parts map[rune]rune
+	next SubexState
+}
+func (state SubexRangeState) eat(store Store, char rune) []SubexBranch {
+	out, exists := state.parts[char]
+	if !exists {
+		return nil
+	} else {
+		return []SubexBranch{{
+			state: state.next,
+			output: string(out),
+			store: store,
+		}}
+	}
+}
+func (state SubexRangeState) accepting(store Store) []string {
+	return nil
+}
-- 
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