diff --git a/simple-func-store.go b/simple-func-store.go
index cfc9373..2ce81f3 100644
--- a/simple-func-store.go
+++ b/simple-func-store.go
@@ -4,7 +4,10 @@
 // simple-func-store.go
 package expr
 
-import "fmt"
+import (
+	"fmt"
+	"strings"
+)
 
 type SimpleFuncStore struct {
 	SimpleVarStore
@@ -18,6 +21,29 @@ type funcInfo struct {
 	functor Functor
 }
 
+func (info *funcInfo) ToString(opt FmtOpt) string {
+	var sb strings.Builder
+	var i int
+	sb.WriteString("func(")
+	for i = 0; i < info.minArgs; i++ {
+		if i > 0 {
+			sb.WriteString(", ")
+		}
+		sb.WriteString(fmt.Sprintf("arg%d", i+1))
+	}
+	for ; i < info.maxArgs; i++ {
+		sb.WriteString(fmt.Sprintf("arg%d", i+1))
+	}
+	if info.maxArgs < 0 {
+		if info.minArgs > 0 {
+			sb.WriteString(", ")
+		}
+		sb.WriteString("...")
+	}
+	sb.WriteString(") {...}")
+	return sb.String()
+}
+
 func (info *funcInfo) Name() string {
 	return info.name
 }
@@ -52,6 +78,36 @@ func (ctx *SimpleFuncStore) Clone() ExprContext {
 	}
 }
 
+func funcsCtxToBuilder(sb *strings.Builder, ctx ExprContext, indent int) {
+	sb.WriteString("funcs: {\n")
+	first := true
+	for _, name := range ctx.EnumFuncs(func(name string) bool { return true }) {
+		if first {
+			first = false
+		} else {
+			sb.WriteByte(',')
+			sb.WriteByte('\n')
+		}
+		value, _ := ctx.GetFuncInfo(name)
+		sb.WriteString(strings.Repeat("\t", indent+1))
+		sb.WriteString(name)
+		sb.WriteString("=")
+		if formatter, ok := value.(Formatter); ok {
+			sb.WriteString(formatter.ToString(0))
+		} else {
+			sb.WriteString(fmt.Sprintf("%v", value))
+		}
+	}
+	sb.WriteString("\n}\n")
+}
+
+func (ctx *SimpleFuncStore) ToString(opt FmtOpt) string {
+	var sb strings.Builder
+	sb.WriteString(ctx.SimpleVarStore.ToString(opt))
+	funcsCtxToBuilder(&sb, ctx, 0)
+	return sb.String()
+}
+
 func (ctx *SimpleFuncStore) GetFuncInfo(name string) (info ExprFunc, exists bool) {
 	info, exists = ctx.funcStore[name]
 	return
diff --git a/simple-var-store.go b/simple-var-store.go
index 1702147..ae5e3a9 100644
--- a/simple-var-store.go
+++ b/simple-var-store.go
@@ -79,34 +79,43 @@ func (ctx *SimpleVarStore) EnumFuncs(acceptor func(name string) (accept bool)) (
 	return
 }
 
-func CtxToBuilder(sb *strings.Builder, ctx ExprContext, indent int) {
-	sb.WriteString("{\n")
+func varsCtxToBuilder(sb *strings.Builder, ctx ExprContext, indent int) {
+	sb.WriteString("vars: {\n")
 	first := true
 	for _, name := range ctx.EnumVars(func(name string) bool { return name[0] != '_' }) {
+		if first {
+			first = false
+		} else {
+			sb.WriteByte(',')
+			sb.WriteByte('\n')
+		}
+
 		value, _ := ctx.GetVar(name)
 		sb.WriteString(strings.Repeat("\t", indent+1))
 		sb.WriteString(name)
-		sb.WriteString("=")
-		if _, ok := value.(Functor); ok {
-			sb.WriteString(": func(){}")
+		sb.WriteString(": ")
+		if f, ok := value.(Formatter); ok {
+			sb.WriteString(f.ToString(0))
+		} else if _, ok = value.(Functor); ok {
+			sb.WriteString("func(){}")
 		} else if _, ok = value.(map[any]any); ok {
 			sb.WriteString("dict{}")
 		} else {
 			sb.WriteString(fmt.Sprintf("%v", value))
 		}
-		if first {
-			first = false
-		} else {
-			sb.WriteByte(',')
-		}
-		sb.WriteByte('\n')
 	}
 	sb.WriteString(strings.Repeat("\t", indent))
-	sb.WriteString("}\n")
+	sb.WriteString("\n}\n")
 }
 
-func CtxToString(ctx ExprContext, indent int) string {
+func varsCtxToString(ctx ExprContext, indent int) string {
 	var sb strings.Builder
-	CtxToBuilder(&sb, ctx, indent)
+	varsCtxToBuilder(&sb, ctx, indent)
+	return sb.String()
+}
+
+func (ctx *SimpleVarStore) ToString(opt FmtOpt) string {
+	var sb strings.Builder
+	varsCtxToBuilder(&sb, ctx, 0)
 	return sb.String()
 }