Control vars are now stored in the globalCtx only.

However, it is still allowed to store control var in a local context in special situation

control.go

@@ -4,8 +4,6 @@
 // control.go
 package expr
 
-import "strings"
-
 // Preset control variables
 const (
 	ControlPreset        = "_preset"
@@ -34,60 +32,6 @@ func initDefaultVars(ctx ExprContext) {
 	ctx.SetVar(ControlSearchPath, init_search_path)
 }
 
-func CtrlEnable(ctx ExprContext, name string) (currentStatus bool) {
-	if !strings.HasPrefix(name, "_") {
-		name = "_" + name
-	}
-	if v, exists := ctx.GetVar(name); exists && IsBool(v) {
-		currentStatus, _ = v.(bool)
-	}
-
-	ctx.SetVar(name, true)
-	return currentStatus
-}
-
-func CtrlDisable(ctx ExprContext, name string) (currentStatus bool) {
-	if !strings.HasPrefix(name, "_") {
-		name = "_" + name
-	}
-	if v, exists := ctx.GetVar(name); exists && IsBool(v) {
-		currentStatus, _ = v.(bool)
-	}
-
-	ctx.SetVar(name, false)
-	return currentStatus
-}
-
-func CtrlSet(ctx ExprContext, name string, newValue any) (currentValue any) {
-	if !strings.HasPrefix(name, "_") {
-		name = "_" + name
-	}
-	currentValue, _ = ctx.GetVar(name)
-
-	ctx.SetVar(name, newValue)
-	for parent := ctx.GetParent(); parent != nil; parent = parent.GetParent() {
-		parent.SetVar(name, newValue)
-	}
-	return currentValue
-}
-
-func CtrlGet(ctx ExprContext, name string) (currentValue any) {
-	if !strings.HasPrefix(name, "_") {
-		name = "_" + name
-	}
-	currentValue, _ = ctx.GetVar(name)
-	return currentValue
-}
-
-func isEnabled(ctx ExprContext, name string) (status bool) {
-	if v, exists := ctx.GetVar(name); exists {
-		if b, ok := v.(bool); ok {
-			status = b
-		}
-	}
-	return
-}
-
 func getControlString(ctx ExprContext, name string) (s string, exists bool) {
 	var v any
 	if v, exists = ctx.GetVar(name); exists {