From ce5c224211a94bfd4c898b51d15febdf2ed9d6f2 Mon Sep 17 00:00:00 2001
From: Charlie Stanton <charlie@shtanton.xyz>
Date: Fri, 26 Aug 2022 11:51:46 +0100
Subject: Refactors some stuff and adds lexing and parsing

---
 main/pathfilter.go | 31 ++++++++++++++++---------------
 1 file changed, 16 insertions(+), 15 deletions(-)

(limited to 'main/pathfilter.go')

diff --git a/main/pathfilter.go b/main/pathfilter.go
index 7b6c64f..b64872e 100644
--- a/main/pathfilter.go
+++ b/main/pathfilter.go
@@ -1,20 +1,5 @@
 package main
 
-type MapTerminalFilter struct {}
-func (filter MapTerminalFilter) exec(state *ProgramState) bool {
-	terminal, isTerminal := state.space.value.(TerminalValue)
-	if !isTerminal {
-		return false
-	}
-	return terminal == MapBegin || terminal == MapEnd
-}
-
-type NonTerminalFilter struct {}
-func (filter NonTerminalFilter) exec(state *ProgramState) bool {
-	_, isTerminal := state.space.value.(TerminalValue)
-	return !isTerminal
-}
-
 type AnySegmentPathFilter struct {
 	next PathFilterState
 }
@@ -72,6 +57,22 @@ func (filter StringSegmentPathFilter) accept() bool {
 	return false
 }
 
+type IntegerSegmentPathFilter struct {
+	index int
+	next PathFilterState
+}
+func (filter IntegerSegmentPathFilter) eat(segment PathSegment) map[PathFilterState]struct{} {
+	i, isInteger := segment.(int)
+	res := make(map[PathFilterState]struct{})
+	if isInteger && i == filter.index {
+		res[filter.next] = struct{}{}
+	}
+	return res
+}
+func (filter IntegerSegmentPathFilter) accept() bool {
+	return false
+}
+
 type PathFilterState interface {
 	eat(PathSegment) map[PathFilterState]struct{}
 	accept() bool
-- 
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