modify config options. can custom binding struct config

.github/workflows/go.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        go_version: [1.12, 1.13, 1.14, 1.15]
+        go_version: [1.12, 1.13, 1.14, 1.15, 1.16]
         os: [ubuntu-latest, windows-latest, macOS-latest]
 
     steps:

config.go

@@ -44,6 +44,8 @@ import (
 	"os"
 	"strings"
 	"sync"
+
+	"github.com/mitchellh/mapstructure"
 )
 
 // There are supported config format
@@ -96,13 +98,17 @@ type Options struct {
 	// parse key, allow find value by key path. eg: 'key.sub' will find `map[key]sub`
 	ParseKey bool
 	// tag name for binding data to struct
+	// Deprecated
+	// please set tag name by DecoderConfig
 	TagName string
 	// the delimiter char for split key path, if `FindByPath=true`. default is '.'
 	Delimiter byte
 	// default write format
 	DumpFormat string
 	// default input format
 	ReadFormat string
+	// DecoderConfig setting for binding data to struct
+	DecoderConfig *mapstructure.DecoderConfig
 }
 
 // Config structure definition
@@ -183,9 +189,20 @@ func newDefaultOption() *Options {
 		ParseKey:  true,
 		TagName:   defaultStructTag,
 		Delimiter: defaultDelimiter,
-
+		// for export
 		DumpFormat: JSON,
 		ReadFormat: JSON,
+		// struct decoder config
+		DecoderConfig: newDefaultDecoderConfig(),
+	}
+}
+
+func newDefaultDecoderConfig() *mapstructure.DecoderConfig {
+	return &mapstructure.DecoderConfig{
+		// tag name for binding struct
+		TagName: defaultStructTag,
+		// will auto convert string to int/uint
+		WeaklyTypedInput: true,
 	}
 }
 
@@ -194,7 +211,7 @@ func newDefaultOption() *Options {
  *************************************************************/
 
 // ParseEnv set parse env
-func ParseEnv(opts *Options) { opts.ParseEnv = true}
+func ParseEnv(opts *Options) { opts.ParseEnv = true }
 
 // Readonly set readonly
 func Readonly(opts *Options) { opts.Readonly = true }
@@ -207,7 +224,7 @@ func Delimiter(sep byte) func(*Options) {
 }
 
 // EnableCache set readonly
-func EnableCache(opts *Options) { opts.EnableCache = true}
+func EnableCache(opts *Options) { opts.EnableCache = true }
 
 // WithOptions with options
 func WithOptions(opts ...func(*Options)) { dc.WithOptions(opts...) }

export.go

@@ -44,16 +44,19 @@ func (c *Config) Structure(key string, dst interface{}) error {
 		}
 	}
 
-	// err = mapstructure.Decode(data, dst)
-	mapConf := &mapstructure.DecoderConfig{
-		Metadata: nil,
-		Result:   dst,
-		TagName:  c.opts.TagName,
-		// will auto convert string to int/uint
-		WeaklyTypedInput: true,
+	var bindConf *mapstructure.DecoderConfig
+	if c.opts.DecoderConfig == nil {
+		bindConf = newDefaultDecoderConfig()
+	} else {
+		bindConf = c.opts.DecoderConfig
+		// Compatible with previous settings opts.TagName
+		if bindConf.TagName == "" {
+			bindConf.TagName = c.opts.TagName
+		}
 	}
 
-	decoder, err := mapstructure.NewDecoder(mapConf)
+	bindConf.Result = dst // set result struct ptr
+	decoder, err := mapstructure.NewDecoder(bindConf)
 	if err != nil {
 		return err
 	}

export_test.go

@@ -137,3 +137,94 @@ func TestConfig_Structure(t *testing.T) {
 
 	cfg.ClearAll()
 }
+
+func TestMapStruct_embedded_struct_squash_false(t *testing.T) {
+	loader := NewWithOptions("test", func(options *Options) {
+		options.DecoderConfig.TagName = "json"
+		options.DecoderConfig.Squash = false
+	})
+	assert.False(t, loader.Options().DecoderConfig.Squash)
+
+	err := loader.LoadStrings(JSON, `
+{
+  "c": "12",
+  "test1": {
+	"b": "34"
+  }
+}
+`)
+	assert.NoError(t, err)
+	dump.Println(loader.Data())
+	assert.Equal(t, 12, loader.Int("c"))
+	assert.Equal(t, 34, loader.Int("test1.b"))
+
+	type Test1 struct {
+		B int `json:"b"`
+	}
+	type Test2 struct {
+		Test1
+		C int `json:"c"`
+	}
+	cfg := &Test2{}
+
+	err = loader.MapStruct("", cfg)
+	assert.NoError(t, err)
+	dump.Println(cfg)
+	assert.Equal(t, 34, cfg.Test1.B)
+
+	type Test3 struct {
+		*Test1
+		C int `json:"c"`
+	}
+	cfg1 := &Test3{}
+	err = loader.MapStruct("", cfg1)
+	assert.NoError(t, err)
+	dump.Println(cfg1)
+	assert.Equal(t, 34, cfg1.Test1.B)
+}
+
+func TestMapStruct_embedded_struct_squash_true(t *testing.T) {
+	loader := NewWithOptions("test", func(options *Options) {
+		options.DecoderConfig.TagName = "json"
+		options.DecoderConfig.Squash = true
+	})
+	assert.True(t, loader.Options().DecoderConfig.Squash)
+
+	err := loader.LoadStrings(JSON, `
+{
+  "c": "12",
+  "test1": {
+	"b": "34"
+  }
+}
+`)
+	assert.NoError(t, err)
+	dump.Println(loader.Data())
+	assert.Equal(t, 12, loader.Int("c"))
+	assert.Equal(t, 34, loader.Int("test1.b"))
+
+	type Test1 struct {
+		B int `json:"b"`
+	}
+	type Test2 struct {
+		Test1
+		// Test1 `json:",squash"`
+		C int `json:"c"`
+	}
+	cfg := &Test2{}
+
+	err = loader.MapStruct("", cfg)
+	assert.NoError(t, err)
+	dump.Println(cfg)
+	assert.Equal(t, 0, cfg.Test1.B)
+
+	type Test3 struct {
+		*Test1
+		C int `json:"c"`
+	}
+	cfg1 := &Test3{}
+	err = loader.MapStruct("", cfg1)
+	assert.NoError(t, err)
+	dump.Println(cfg1)
+	assert.Equal(t, 34, cfg1.Test1.B)
+}

go.sum

@@ -5,59 +5,50 @@ github.com/agext/levenshtein v1.2.1/go.mod h1:JEDfjyjHDjOF/1e4FlBE/PkbqA9OfWu2ki
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@@ -68,6 +59,7 @@ github.com/modern-go/reflect2 v1.0.1 h1:9f412s+6RmYXLWZSEzVVgPGK7C2PphHj5RJrvfx9
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@@ -81,6 +73,7 @@ github.com/vmihailenco/msgpack/v4 v4.3.12/go.mod h1:gborTTJjAo/GWTqqRjrLCn9pgNN+
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