From 12c1d179f32c38a929fcc9adb326a9f44c8288ae Mon Sep 17 00:00:00 2001
From: Charlie Stanton <charlie@shtanton.xyz>
Date: Fri, 21 Apr 2023 16:22:16 +0100
Subject: Replaces the interfaces implementation of Atom with a tagged union
 based implementation

---
 subex/subexstate.go | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

(limited to 'subex/subexstate.go')

diff --git a/subex/subexstate.go b/subex/subexstate.go
index b5e1e9b..56063c0 100644
--- a/subex/subexstate.go
+++ b/subex/subexstate.go
@@ -153,8 +153,7 @@ type SubexCopyBoolState struct {
 	next SubexState
 }
 func (state SubexCopyBoolState) eat(store Store, outputStack OutputStack, char walk.Atom) []SubexBranch {
-	_, isBool := char.(walk.ValueBool)
-	if isBool {
+	if char.Typ == walk.AtomBool {
 		return []SubexBranch{{
 			state: state.next,
 			outputStack: topAppend(outputStack, []walk.Atom{char}),
@@ -172,8 +171,7 @@ type SubexCopyNumberState struct {
 	next SubexState
 }
 func (state SubexCopyNumberState) eat(store Store, outputStack OutputStack, char walk.Atom) []SubexBranch {
-	_, isNumber := char.(walk.ValueNumber)
-	if isNumber {
+	if char.Typ == walk.AtomNumber {
 		return []SubexBranch{{
 			state: state.next,
 			outputStack: topAppend(outputStack, []walk.Atom{char}),
@@ -191,8 +189,7 @@ type SubexCopyStringAtomState struct {
 	next SubexState
 }
 func (state SubexCopyStringAtomState) eat(store Store, outputStack OutputStack, char walk.Atom) []SubexBranch {
-	_, isStringAtom := char.(walk.StringAtom)
-	if isStringAtom {
+	if char.Typ == walk.AtomStringRune {
 		return []SubexBranch{{
 			state: state.next,
 			outputStack: topAppend(outputStack, []walk.Atom{char}),
@@ -210,9 +207,7 @@ type SubexCopyNonStringAtomState struct {
 	next SubexState
 }
 func (state SubexCopyNonStringAtomState) eat(store Store, outputStack OutputStack, char walk.Atom) []SubexBranch {
-	_, isStringAtom := char.(walk.StringAtom)
-	_, isStringTerminal := char.(walk.StringTerminal)
-	if isStringAtom || isStringTerminal {
+	if char.Typ == walk.AtomStringRune || char.Typ == walk.AtomStringTerminal {
 		return nil
 	}
 	return []SubexBranch{{
-- 
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