From bfe89e0b12adce04d9b84e6cf4d9e8914a90faeb Mon Sep 17 00:00:00 2001
From: John <john@johng.cn>
Date: Sat, 28 Nov 2020 22:48:01 +0800
Subject: [PATCH] add build-in fuction json for package gview

---
 os/gview/gview.go                 |  1 +
 os/gview/gview_buildin.go         |  8 ++++++++
 os/gview/gview_unit_basic_test.go | 12 ++++++++++++
 3 files changed, 21 insertions(+)

diff --git a/os/gview/gview.go b/os/gview/gview.go
index 58208e4ab..0112ac00f 100644
--- a/os/gview/gview.go
+++ b/os/gview/gview.go
@@ -137,6 +137,7 @@ func New(path ...string) *View {
 		"dump":       view.buildInFuncDump,
 		"map":        view.buildInFuncMap,
 		"maps":       view.buildInFuncMaps,
+		"json":       view.buildInFuncJson,
 	})
 
 	return view
diff --git a/os/gview/gview_buildin.go b/os/gview/gview_buildin.go
index 4af4cfd04..fc4f8f697 100644
--- a/os/gview/gview_buildin.go
+++ b/os/gview/gview_buildin.go
@@ -8,6 +8,7 @@ package gview
 
 import (
 	"fmt"
+	"github.com/gogf/gf/internal/json"
 	"github.com/gogf/gf/util/gutil"
 	"strings"
 
@@ -215,3 +216,10 @@ func (view *View) buildInFuncToLower(str interface{}) string {
 func (view *View) buildInFuncNl2Br(str interface{}) string {
 	return gstr.Nl2Br(gconv.String(str))
 }
+
+// buildInFuncJson implements build-in template function: json ,
+// which encodes and returns <value> as JSON string.
+func (view *View) buildInFuncJson(value interface{}) (string, error) {
+	b, err := json.Marshal(value)
+	return gconv.UnsafeBytesToStr(b), err
+}
diff --git a/os/gview/gview_unit_basic_test.go b/os/gview/gview_unit_basic_test.go
index 0fcab287d..afca128ed 100644
--- a/os/gview/gview_unit_basic_test.go
+++ b/os/gview/gview_unit_basic_test.go
@@ -400,3 +400,15 @@ func Test_BuildInFuncDump(t *testing.T) {
 		t.Assert(gstr.Contains(r, `"score": 100`), true)
 	})
 }
+
+func Test_BuildInFuncJson(t *testing.T) {
+	gtest.C(t, func(t *gtest.T) {
+		v := gview.New()
+		v.Assign("v", g.Map{
+			"name": "john",
+		})
+		r, err := v.ParseContent("{{json .v}}")
+		t.Assert(err, nil)
+		t.Assert(r, `{"name":"john"}`)
+	})
+}