Added utility function GetLast() to context

simple-store.go

@@ -7,7 +7,7 @@ package expr
 import (
 	"fmt"
 	"slices"
-//	"strings"
+	// "strings"
 )
 
 type SimpleStore struct {
@@ -50,6 +50,7 @@ func (ctx *SimpleStore) Merge(src ExprContext) {
 		ctx.funcStore[name], _ = src.GetFuncInfo(name)
 	}
 }
+
 /*
 func varsCtxToBuilder(sb *strings.Builder, ctx ExprContext, indent int) {
 	sb.WriteString("vars: {\n")
@@ -165,6 +166,11 @@ func (ctx *SimpleStore) GetVar(varName string) (v any, exists bool) {
 	return
 }
 
+func (ctx *SimpleStore) GetLast() (v any) {
+	v = ctx.varStore["last"]
+	return
+}
+
 func (ctx *SimpleStore) UnsafeSetVar(varName string, value any) {
 	// fmt.Printf("[%p] setVar(%v, %v)\n", ctx, varName, value)
 	ctx.varStore[varName] = value