Support unmarshal into toml.Tree (#347)

Fixes #333

Makefile

@@ -0,0 +1,29 @@
+export CGO_ENABLED=0
+go := go
+go.goos ?= $(shell echo `go version`|cut -f4 -d ' '|cut -d '/' -f1)
+go.goarch ?= $(shell echo `go version`|cut -f4 -d ' '|cut -d '/' -f2)
+
+out.tools := tomll tomljson jsontoml
+out.dist := $(out.tools:=_$(go.goos)_$(go.goarch).tar.xz)
+sources := $(wildcard **/*.go)
+
+
+.PHONY:
+tools: $(out.tools)
+
+$(out.tools): $(sources)
+	GOOS=$(go.goos) GOARCH=$(go.goarch) $(go) build ./cmd/$@
+
+.PHONY:
+dist: $(out.dist)
+
+$(out.dist):%_$(go.goos)_$(go.goarch).tar.xz: %
+	if [ "$(go.goos)" = "windows" ]; then \
+		tar -cJf $@ $^.exe; \
+	else \
+		tar -cJf $@ $^; \
+	fi
+
+.PHONY:
+clean:
+	rm -rf $(out.tools) $(out.dist)

azure-pipelines.yml

@@ -13,9 +13,9 @@ stages:
       vmImage: ubuntu-latest
     steps:
     - task: GoTool@0
-      displayName: "Install Go 1.13"
+      displayName: "Install Go 1.14"
       inputs:
-        version: "1.13"
+        version: "1.14"
     - script: echo "##vso[task.setvariable variable=PATH]${PATH}:/home/vsts/go/bin/"
     - script: mkdir -p ${HOME}/go/src/github.com/pelletier/go-toml
     - script: cp -R . ${HOME}/go/src/github.com/pelletier/go-toml
@@ -36,9 +36,9 @@ stages:
       vmImage: ubuntu-latest
     steps:
     - task: GoTool@0
-      displayName: "Install Go 1.13"
+      displayName: "Install Go 1.14"
       inputs:
-        version: "1.13"
+        version: "1.14"
     - task: Go@0
       displayName: "go fmt ./..."
       inputs:
@@ -51,9 +51,9 @@ stages:
       vmImage: ubuntu-latest
     steps:
     - task: GoTool@0
-      displayName: "Install Go 1.13"
+      displayName: "Install Go 1.14"
       inputs:
-        version: "1.13"
+        version: "1.14"
     - task: Go@0
       displayName: "Generate coverage"
       inputs:
@@ -62,16 +62,18 @@ stages:
     - task: Bash@3
       inputs:
         targetType: 'inline'
-        script: 'bash <(curl -s https://codecov.io/bash) -t $(CODECOV_TOKEN)'
+        script: 'bash <(curl -s https://codecov.io/bash) -t ${CODECOV_TOKEN}'
+      env:
+        CODECOV_TOKEN: $(CODECOV_TOKEN)
   - job: benchmark
     displayName: "benchmark"
     pool:
       vmImage: ubuntu-latest
     steps:
     - task: GoTool@0
-      displayName: "Install Go 1.13"
+      displayName: "Install Go 1.14"
       inputs:
-        version: "1.13"
+        version: "1.14"
     - script: echo "##vso[task.setvariable variable=PATH]${PATH}:/home/vsts/go/bin/"
     - task: Bash@3
       inputs:
@@ -84,9 +86,9 @@ stages:
       vmImage: ubuntu-latest
     steps:
     - task: GoTool@0
-      displayName: "Install Go 1.13"
+      displayName: "Install Go 1.14"
       inputs:
-        version: "1.13"
+        version: "1.14"
     - script: echo "##vso[task.setvariable variable=PATH]${PATH}:/home/vsts/go/bin/"
     - script: mkdir -p ${HOME}/go/src/github.com/pelletier/go-toml
     - script: cp -R . ${HOME}/go/src/github.com/pelletier/go-toml
@@ -100,24 +102,24 @@ stages:
     displayName: "unit tests"
     strategy:
       matrix:
+        linux 1.14:
+          goVersion: '1.14'
+          imageName: 'ubuntu-latest'
+        mac 1.14:
+          goVersion: '1.14'
+          imageName: 'macOS-latest'
+        windows 1.14:
+          goVersion: '1.14'
+          imageName: 'windows-latest'
         linux 1.13:
           goVersion: '1.13'
           imageName: 'ubuntu-latest'
         mac 1.13:
           goVersion: '1.13'
-          imageName: 'macos-10.13'
+          imageName: 'macOS-latest'
         windows 1.13:
           goVersion: '1.13'
-          imageName: 'vs2017-win2016'
+          imageName: 'windows-latest'
-        linux 1.12:
-          goVersion: '1.12'
-          imageName: 'ubuntu-latest'
-        mac 1.12:
-          goVersion: '1.12'
-          imageName: 'macos-10.13'
-        windows 1.12:
-          goVersion: '1.12'
-          imageName: 'vs2017-win2016'
     pool:
       vmImage: $(imageName)
     steps:
@@ -130,6 +132,67 @@ stages:
       inputs:
         command: 'test'
         arguments: './...'
+- stage: build_binaries
+  displayName: "Build binaries"
+  dependsOn: run_checks
+  jobs:
+  - job: build_binary
+    displayName: "Build binary"
+    strategy:
+      matrix:
+        linux_amd64:
+          GOOS: linux
+          GOARCH: amd64
+        darwin_amd64:
+          GOOS: darwin
+          GOARCH: amd64
+        windows_amd64:
+          GOOS: windows
+          GOARCH: amd64
+    pool:
+      vmImage: ubuntu-latest
+    steps:
+    - task: GoTool@0
+      displayName: "Install Go"
+      inputs:
+        version: 1.14
+    - task: Bash@3
+      inputs:
+        targetType: inline
+        script: "make dist"
+      env:
+        go.goos: $(GOOS)
+        go.goarch: $(GOARCH)
+    - task: CopyFiles@2
+      inputs:
+        sourceFolder: '$(Build.SourcesDirectory)'
+        contents: '*.tar.xz'
+        TargetFolder: '$(Build.ArtifactStagingDirectory)'
+    - task: PublishBuildArtifacts@1
+      inputs:
+        pathtoPublish: '$(Build.ArtifactStagingDirectory)'
+        artifactName: binaries
+- stage: build_binaries_manifest
+  displayName: "Build binaries manifest"
+  dependsOn: build_binaries
+  jobs:
+  - job: build_manifest
+    displayName: "Build binaries manifest"
+    steps:
+      - task: DownloadBuildArtifacts@0
+        inputs:
+          buildType: 'current'
+          downloadType: 'single'
+          artifactName: 'binaries'
+          downloadPath: '$(Build.SourcesDirectory)'
+      - task: Bash@3
+        inputs:
+          targetType: inline
+          script: "cd binaries && sha256sum --binary *.tar.xz | tee $(Build.ArtifactStagingDirectory)/sha256sums.txt"
+      - task: PublishBuildArtifacts@1
+        inputs:
+          pathtoPublish: '$(Build.ArtifactStagingDirectory)'
+          artifactName: manifest
 
 - stage: build_docker_image
   displayName: "Build Docker image"
@@ -164,4 +227,4 @@ stages:
         command: 'buildAndPush'
         Dockerfile: 'Dockerfile'
         buildContext: '.'
-        tags: 'latest'
+        tags: 'latest'

go.mod

@@ -5,5 +5,5 @@ go 1.12
 require (
 	github.com/BurntSushi/toml v0.3.1
 	github.com/davecgh/go-spew v1.1.1
-	gopkg.in/yaml.v2 v2.2.4
+	gopkg.in/yaml.v2 v2.2.8
 )

go.sum

@@ -9,3 +9,9 @@ gopkg.in/yaml.v2 v2.2.3 h1:fvjTMHxHEw/mxHbtzPi3JCcKXQRAnQTBRo6YCJSVHKI=
 gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.4 h1:/eiJrUcujPVeJ3xlSWaiNi3uSVmDGBK1pDHUHAnao1I=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.5 h1:ymVxjfMaHvXD8RqPRmzHHsB3VvucivSkIAvJFDI5O3c=
+gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.7 h1:VUgggvou5XRW9mHwD/yXxIYSMtY0zoKQf/v226p2nyo=
+gopkg.in/yaml.v2 v2.2.7/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.8 h1:obN1ZagJSUGI0Ek/LBmuj4SNLPfIny3KsKFopxRdj10=
+gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

lexer.go

@@ -256,7 +256,7 @@ func (l *tomlLexer) lexLeftCurlyBrace() tomlLexStateFn {
 func (l *tomlLexer) lexRightCurlyBrace() tomlLexStateFn {
 	l.next()
 	l.emit(tokenRightCurlyBrace)
-	return l.lexVoid
+	return l.lexRvalue
 }
 
 func (l *tomlLexer) lexDate() tomlLexStateFn {

marshal.go

@@ -302,7 +302,7 @@ func (e *Encoder) marshal(v interface{}) ([]byte, error) {
 	}
 
 	var buf bytes.Buffer
-	_, err = t.writeToOrdered(&buf, "", "", 0, e.arraysOneElementPerLine, e.order)
+	_, err = t.writeToOrdered(&buf, "", "", 0, e.arraysOneElementPerLine, e.order, false)
 
 	return buf.Bytes(), err
 }
@@ -320,20 +320,25 @@ func (e *Encoder) valueToTree(mtype reflect.Type, mval reflect.Value) (*Tree, er
 	tval := e.nextTree()
 	switch mtype.Kind() {
 	case reflect.Struct:
-		for i := 0; i < mtype.NumField(); i++ {
+		switch mval.Interface().(type) {
-			mtypef, mvalf := mtype.Field(i), mval.Field(i)
+		case Tree:
-			opts := tomlOptions(mtypef, e.annotation)
+			reflect.ValueOf(tval).Elem().Set(mval)
-			if opts.include && (!opts.omitempty || !isZero(mvalf)) {
+		default:
-				val, err := e.valueToToml(mtypef.Type, mvalf)
+			for i := 0; i < mtype.NumField(); i++ {
-				if err != nil {
+				mtypef, mvalf := mtype.Field(i), mval.Field(i)
-					return nil, err
+				opts := tomlOptions(mtypef, e.annotation)
-				}
+				if opts.include && ((mtypef.Type.Kind() != reflect.Interface && !opts.omitempty) || !isZero(mvalf)) {
+					val, err := e.valueToToml(mtypef.Type, mvalf)
+					if err != nil {
+						return nil, err
+					}
 
-				tval.SetWithOptions(opts.name, SetOptions{
+					tval.SetWithOptions(opts.name, SetOptions{
-					Comment:   opts.comment,
+						Comment:   opts.comment,
-					Commented: opts.commented,
+						Commented: opts.commented,
-					Multiline: opts.multiline,
+						Multiline: opts.multiline,
-				}, val)
+					}, val)
+				}
 			}
 		}
 	case reflect.Map:
@@ -358,12 +363,15 @@ func (e *Encoder) valueToTree(mtype reflect.Type, mval reflect.Value) (*Tree, er
 		}
 		for _, key := range keys {
 			mvalf := mval.MapIndex(key)
+			if (mtype.Elem().Kind() == reflect.Ptr || mtype.Elem().Kind() == reflect.Interface) && mvalf.IsNil() {
+				continue
+			}
 			val, err := e.valueToToml(mtype.Elem(), mvalf)
 			if err != nil {
 				return nil, err
 			}
 			if e.quoteMapKeys {
-				keyStr, err := tomlValueStringRepresentation(key.String(), "", e.arraysOneElementPerLine)
+				keyStr, err := tomlValueStringRepresentation(key.String(), "", "", e.arraysOneElementPerLine)
 				if err != nil {
 					return nil, err
 				}
@@ -391,6 +399,9 @@ func (e *Encoder) valueToTreeSlice(mtype reflect.Type, mval reflect.Value) ([]*T
 
 // Convert given marshal slice to slice of toml values
 func (e *Encoder) valueToOtherSlice(mtype reflect.Type, mval reflect.Value) (interface{}, error) {
+	if mtype.Elem().Kind() == reflect.Interface {
+		return nil, fmt.Errorf("marshal can't handle []interface{}")
+	}
 	tval := make([]interface{}, mval.Len(), mval.Len())
 	for i := 0; i < mval.Len(); i++ {
 		val, err := e.valueToToml(mtype.Elem(), mval.Index(i))
@@ -408,6 +419,9 @@ func (e *Encoder) valueToToml(mtype reflect.Type, mval reflect.Value) (interface
 	if mtype.Kind() == reflect.Ptr {
 		return e.valueToToml(mtype.Elem(), mval.Elem())
 	}
+	if mtype.Kind() == reflect.Interface {
+		return e.valueToToml(mval.Elem().Type(), mval.Elem())
+	}
 	switch {
 	case isCustomMarshaler(mtype):
 		return callCustomMarshaler(mval)
@@ -561,11 +575,17 @@ func (d *Decoder) valueFromTree(mtype reflect.Type, tval *Tree, mval1 *reflect.V
 			mval = reflect.New(mtype).Elem()
 		}
 
-		for i := 0; i < mtype.NumField(); i++ {
+		switch mval.Interface().(type) {
-			mtypef := mtype.Field(i)
+		case Tree:
-			an := annotation{tag: d.tagName}
+			mval.Set(reflect.ValueOf(tval).Elem())
-			opts := tomlOptions(mtypef, an)
+		default:
-			if opts.include {
+			for i := 0; i < mtype.NumField(); i++ {
+				mtypef := mtype.Field(i)
+				an := annotation{tag: d.tagName}
+				opts := tomlOptions(mtypef, an)
+				if !opts.include {
+					continue
+				}
 				baseKey := opts.name
 				keysToTry := []string{
 					baseKey,
@@ -575,20 +595,22 @@ func (d *Decoder) valueFromTree(mtype reflect.Type, tval *Tree, mval1 *reflect.V
 				}
 
 				found := false
-				for _, key := range keysToTry {
+				if tval != nil {
-					exists := tval.Has(key)
+					for _, key := range keysToTry {
-					if !exists {
+						exists := tval.Has(key)
-						continue
+						if !exists {
+							continue
+						}
+						val := tval.Get(key)
+						fval := mval.Field(i)
+						mvalf, err := d.valueFromToml(mtypef.Type, val, &fval)
+						if err != nil {
+							return mval, formatError(err, tval.GetPosition(key))
+						}
+						mval.Field(i).Set(mvalf)
+						found = true
+						break
 					}
-					val := tval.Get(key)
-					fval := mval.Field(i)
-					mvalf, err := d.valueFromToml(mtypef.Type, val, &fval)
-					if err != nil {
-						return mval, formatError(err, tval.GetPosition(key))
-					}
-					mval.Field(i).Set(mvalf)
-					found = true
-					break
 				}
 
 				if !found && opts.defaultValue != "" {
@@ -624,9 +646,13 @@ func (d *Decoder) valueFromTree(mtype reflect.Type, tval *Tree, mval1 *reflect.V
 					mval.Field(i).Set(reflect.ValueOf(val))
 				}
 
-				// save the old behavior above and try to check anonymous structs
+				// save the old behavior above and try to check structs
-				if !found && opts.defaultValue == "" && mtypef.Anonymous && mtypef.Type.Kind() == reflect.Struct {
+				if !found && opts.defaultValue == "" && mtypef.Type.Kind() == reflect.Struct {
-					v, err := d.valueFromTree(mtypef.Type, tval, nil)
+					tmpTval := tval
+					if !mtypef.Anonymous {
+						tmpTval = nil
+					}
+					v, err := d.valueFromTree(mtypef.Type, tmpTval, nil)
 					if err != nil {
 						return v, err
 					}
@@ -692,16 +718,41 @@ func (d *Decoder) valueFromToml(mtype reflect.Type, tval interface{}, mval1 *ref
 		if isTree(mtype) {
 			return d.valueFromTree(mtype, t, mval11)
 		}
+
+		if mtype.Kind() == reflect.Interface {
+			if mval1 == nil || mval1.IsNil() {
+				return d.valueFromTree(reflect.TypeOf(map[string]interface{}{}), t, nil)
+			} else {
+				return d.valueFromToml(mval1.Elem().Type(), t, nil)
+			}
+		}
+
 		return reflect.ValueOf(nil), fmt.Errorf("Can't convert %v(%T) to a tree", tval, tval)
 	case []*Tree:
 		if isTreeSequence(mtype) {
 			return d.valueFromTreeSlice(mtype, t)
 		}
+		if mtype.Kind() == reflect.Interface {
+			if mval1 == nil || mval1.IsNil() {
+				return d.valueFromTreeSlice(reflect.TypeOf([]map[string]interface{}{}), t)
+			} else {
+				ival := mval1.Elem()
+				return d.valueFromToml(mval1.Elem().Type(), t, &ival)
+			}
+		}
 		return reflect.ValueOf(nil), fmt.Errorf("Can't convert %v(%T) to trees", tval, tval)
 	case []interface{}:
 		if isOtherSequence(mtype) {
 			return d.valueFromOtherSlice(mtype, t)
 		}
+		if mtype.Kind() == reflect.Interface {
+			if mval1 == nil || mval1.IsNil() {
+				return d.valueFromOtherSlice(reflect.TypeOf([]interface{}{}), t)
+			} else {
+				ival := mval1.Elem()
+				return d.valueFromToml(mval1.Elem().Type(), t, &ival)
+			}
+		}
 		return reflect.ValueOf(nil), fmt.Errorf("Can't convert %v(%T) to a slice", tval, tval)
 	default:
 		switch mtype.Kind() {
@@ -786,6 +837,13 @@ func (d *Decoder) valueFromToml(mtype reflect.Type, tval interface{}, mval1 *ref
 			}
 
 			return val.Convert(mtype), nil
+		case reflect.Interface:
+			if mval1 == nil || mval1.IsNil() {
+				return reflect.ValueOf(tval), nil
+			} else {
+				ival := mval1.Elem()
+				return d.valueFromToml(mval1.Elem().Type(), t, &ival)
+			}
 		default:
 			return reflect.ValueOf(nil), fmt.Errorf("Can't convert %v(%T) to %v(%v)", tval, tval, mtype, mtype.Kind())
 		}
@@ -795,7 +853,7 @@ func (d *Decoder) valueFromToml(mtype reflect.Type, tval interface{}, mval1 *ref
 func (d *Decoder) unwrapPointer(mtype reflect.Type, tval interface{}, mval1 *reflect.Value) (reflect.Value, error) {
 	var melem *reflect.Value
 
-	if mval1 != nil && !mval1.IsNil() && mtype.Elem().Kind() == reflect.Struct {
+	if mval1 != nil && !mval1.IsNil() && (mtype.Elem().Kind() == reflect.Struct || mtype.Elem().Kind() == reflect.Interface) {
 		elem := mval1.Elem()
 		melem = &elem
 	}

marshal_test.go

@@ -157,6 +157,44 @@ var mashalOrderPreserveMapToml = []byte(`title = "TOML Marshal Testing"
   j9 = "10"
 `)
 
+type Conf struct {
+	Name  string
+	Age   int
+	Inter interface{}
+}
+
+type NestedStruct struct {
+	FirstName string
+	LastName  string
+	Age       int
+}
+
+var doc = []byte(`Name = "rui"
+Age = 18
+
+[Inter]
+  FirstName = "wang"
+  LastName = "jl"
+  Age = 100`)
+
+func TestInterface(t *testing.T) {
+	var config Conf
+	config.Inter = &NestedStruct{}
+	err := Unmarshal(doc, &config)
+	expected := Conf{
+		Name: "rui",
+		Age:  18,
+		Inter: &NestedStruct{
+			FirstName: "wang",
+			LastName:  "jl",
+			Age:       100,
+		},
+	}
+	if err != nil || !reflect.DeepEqual(config, expected) {
+		t.Errorf("Bad unmarshal: expected %v, got %v", expected, config)
+	}
+}
+
 func TestBasicMarshal(t *testing.T) {
 	result, err := Marshal(basicTestData)
 	if err != nil {
@@ -913,6 +951,213 @@ func TestMarshalComment(t *testing.T) {
 	}
 }
 
+func TestMarshalMultilineCommented(t *testing.T) {
+	expectedToml := []byte(`# MultilineArray = [
+  # 100,
+  # 200,
+  # 300,
+# ]
+# MultilineNestedArray = [
+  # [
+  # "a",
+  # "b",
+  # "c",
+# ],
+  # [
+  # "d",
+  # "e",
+  # "f",
+# ],
+# ]
+# MultilineString = """
+# I
+# am
+# Allen"""
+NonCommented = "Not commented line"
+`)
+	type StructWithMultiline struct {
+		NonCommented         string
+		MultilineString      string     `commented:"true" multiline:"true"`
+		MultilineArray       []int      `commented:"true"`
+		MultilineNestedArray [][]string `commented:"true"`
+	}
+
+	var buf bytes.Buffer
+	enc := NewEncoder(&buf)
+	if err := enc.ArraysWithOneElementPerLine(true).Encode(StructWithMultiline{
+		NonCommented:    "Not commented line",
+		MultilineString: "I\nam\nAllen",
+		MultilineArray:  []int{100, 200, 300},
+		MultilineNestedArray: [][]string{
+			{"a", "b", "c"},
+			{"d", "e", "f"},
+		},
+	}); err == nil {
+		result := buf.Bytes()
+		if !bytes.Equal(result, expectedToml) {
+			t.Errorf("Bad marshal: expected\n-----\n%s\n-----\ngot\n-----\n%s\n-----\n", expectedToml, result)
+		}
+	} else {
+		t.Fatal(err)
+	}
+}
+
+func TestMarshalNonPrimitiveTypeCommented(t *testing.T) {
+	expectedToml := []byte(`
+# [CommentedMapField]
+
+  # [CommentedMapField.CommentedMapField1]
+    # SingleLineString = "This line should be commented out"
+
+  # [CommentedMapField.CommentedMapField2]
+    # SingleLineString = "This line should be commented out"
+
+# [CommentedStructField]
+
+  # [CommentedStructField.CommentedStructField]
+    # MultilineArray = [
+      # 1,
+      # 2,
+    # ]
+    # MultilineNestedArray = [
+      # [
+      # 10,
+      # 20,
+    # ],
+      # [
+      # 100,
+      # 200,
+    # ],
+    # ]
+    # MultilineString = """
+# This line
+# should be
+# commented out"""
+
+  # [CommentedStructField.NotCommentedStructField]
+    # MultilineArray = [
+      # 1,
+      # 2,
+    # ]
+    # MultilineNestedArray = [
+      # [
+      # 10,
+      # 20,
+    # ],
+      # [
+      # 100,
+      # 200,
+    # ],
+    # ]
+    # MultilineString = """
+# This line
+# should be
+# commented out"""
+
+[NotCommentedStructField]
+
+  # [NotCommentedStructField.CommentedStructField]
+    # MultilineArray = [
+      # 1,
+      # 2,
+    # ]
+    # MultilineNestedArray = [
+      # [
+      # 10,
+      # 20,
+    # ],
+      # [
+      # 100,
+      # 200,
+    # ],
+    # ]
+    # MultilineString = """
+# This line
+# should be
+# commented out"""
+
+  [NotCommentedStructField.NotCommentedStructField]
+    MultilineArray = [
+      3,
+      4,
+    ]
+    MultilineNestedArray = [
+      [
+      30,
+      40,
+    ],
+      [
+      300,
+      400,
+    ],
+    ]
+    MultilineString = """
+This line
+should NOT be
+commented out"""
+`)
+	type InnerStruct struct {
+		MultilineString      string `multiline:"true"`
+		MultilineArray       []int
+		MultilineNestedArray [][]int
+	}
+	type MiddleStruct struct {
+		NotCommentedStructField InnerStruct
+		CommentedStructField    InnerStruct `commented:"true"`
+	}
+	type OuterStruct struct {
+		CommentedStructField    MiddleStruct `commented:"true"`
+		NotCommentedStructField MiddleStruct
+		CommentedMapField       map[string]struct{ SingleLineString string } `commented:"true"`
+	}
+
+	commentedTestStruct := OuterStruct{
+		CommentedStructField: MiddleStruct{
+			NotCommentedStructField: InnerStruct{
+				MultilineString:      "This line\nshould be\ncommented out",
+				MultilineArray:       []int{1, 2},
+				MultilineNestedArray: [][]int{{10, 20}, {100, 200}},
+			},
+			CommentedStructField: InnerStruct{
+				MultilineString:      "This line\nshould be\ncommented out",
+				MultilineArray:       []int{1, 2},
+				MultilineNestedArray: [][]int{{10, 20}, {100, 200}},
+			},
+		},
+		NotCommentedStructField: MiddleStruct{
+			NotCommentedStructField: InnerStruct{
+				MultilineString:      "This line\nshould NOT be\ncommented out",
+				MultilineArray:       []int{3, 4},
+				MultilineNestedArray: [][]int{{30, 40}, {300, 400}},
+			},
+			CommentedStructField: InnerStruct{
+				MultilineString:      "This line\nshould be\ncommented out",
+				MultilineArray:       []int{1, 2},
+				MultilineNestedArray: [][]int{{10, 20}, {100, 200}},
+			},
+		},
+		CommentedMapField: map[string]struct{ SingleLineString string }{
+			"CommentedMapField1": {
+				SingleLineString: "This line should be commented out",
+			},
+			"CommentedMapField2": {
+				SingleLineString: "This line should be commented out",
+			},
+		},
+	}
+
+	var buf bytes.Buffer
+	enc := NewEncoder(&buf)
+	if err := enc.ArraysWithOneElementPerLine(true).Encode(commentedTestStruct); err == nil {
+		result := buf.Bytes()
+		if !bytes.Equal(result, expectedToml) {
+			t.Errorf("Bad marshal: expected\n-----\n%s\n-----\ngot\n-----\n%s\n-----\n", expectedToml, result)
+		}
+	} else {
+		t.Fatal(err)
+	}
+}
+
 type mapsTestStruct struct {
 	Simple map[string]string
 	Paths  map[string]string
@@ -1199,6 +1444,54 @@ func TestMarshalCustomMultiline(t *testing.T) {
 	}
 }
 
+func TestMarshalEmbedTree(t *testing.T) {
+	expected := []byte(`OuterField1 = "Out"
+OuterField2 = 1024
+
+[TreeField]
+  InnerField1 = "In"
+  InnerField2 = 2048
+
+  [TreeField.EmbedStruct]
+    EmbedField = "Embed"
+`)
+	type InnerStruct struct {
+		InnerField1 string
+		InnerField2 int
+		EmbedStruct struct{
+			EmbedField string
+		}
+	}
+
+	type OuterStruct struct {
+		OuterField1 string
+		OuterField2 int
+		TreeField *Tree
+	}
+
+	tree, err := Load(`
+InnerField1 = "In"
+InnerField2 = 2048
+
+[EmbedStruct]
+	EmbedField = "Embed"
+`)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	out := OuterStruct{
+		"Out",
+		1024,
+		tree,
+	}
+	actual, _ := Marshal(out)
+
+	if !bytes.Equal(actual, expected){
+		t.Errorf("Bad marshal: expected %s, got %s", expected, actual)
+	}
+}
+
 var testDocBasicToml = []byte(`
 [document]
   bool_val = true
@@ -1483,12 +1776,20 @@ func TestUnmarshalCamelCaseKey(t *testing.T) {
 }
 
 func TestUnmarshalDefault(t *testing.T) {
+	type EmbeddedStruct struct {
+		StringField string `default:"c"`
+	}
+
 	var doc struct {
-		StringField  string  `default:"a"`
+		StringField       string  `default:"a"`
-		BoolField    bool    `default:"true"`
+		BoolField         bool    `default:"true"`
-		IntField     int     `default:"1"`
+		IntField          int     `default:"1"`
-		Int64Field   int64   `default:"2"`
+		Int64Field        int64   `default:"2"`
-		Float64Field float64 `default:"3.1"`
+		Float64Field      float64 `default:"3.1"`
+		NonEmbeddedStruct struct {
+			StringField string `default:"b"`
+		}
+		EmbeddedStruct
 	}
 
 	err := Unmarshal([]byte(``), &doc)
@@ -1510,6 +1811,12 @@ func TestUnmarshalDefault(t *testing.T) {
 	if doc.Float64Field != 3.1 {
 		t.Errorf("Float64Field should be 3.1, not %f", doc.Float64Field)
 	}
+	if doc.NonEmbeddedStruct.StringField != "b" {
+		t.Errorf("StringField should be \"b\", not %s", doc.NonEmbeddedStruct.StringField)
+	}
+	if doc.EmbeddedStruct.StringField != "c" {
+		t.Errorf("StringField should be \"c\", not %s", doc.EmbeddedStruct.StringField)
+	}
 }
 
 func TestUnmarshalDefaultFailureBool(t *testing.T) {
@@ -2140,3 +2447,328 @@ func TestMarshalLocalTime(t *testing.T) {
 		})
 	}
 }
+
+// test case for issue #339
+func TestUnmarshalSameInnerField(t *testing.T) {
+	type InterStruct2 struct {
+		Test string
+		Name string
+		Age  int
+	}
+	type Inter2 struct {
+		Name         string
+		Age          int
+		InterStruct2 InterStruct2
+	}
+	type Server struct {
+		Name   string `toml:"name"`
+		Inter2 Inter2 `toml:"inter2"`
+	}
+
+	var server Server
+
+	if err := Unmarshal([]byte(`name = "123"
+[inter2]
+name = "inter2"
+age = 222`), &server); err == nil {
+		expected := Server{
+			Name: "123",
+			Inter2: Inter2{
+				Name: "inter2",
+				Age:  222,
+			},
+		}
+		if !reflect.DeepEqual(server, expected) {
+			t.Errorf("Bad unmarshal: expected %v, got %v", expected, server)
+		}
+	} else {
+		t.Fatalf("unexpected error: %v", err)
+	}
+}
+
+func TestMarshalInterface(t *testing.T) {
+	type InnerStruct struct {
+		InnerField string
+	}
+
+	type OuterStruct struct {
+		PrimitiveField        interface{}
+		ArrayField            interface{}
+		StructArrayField      interface{}
+		MapField              map[string]interface{}
+		StructField           interface{}
+		PointerField          interface{}
+		NilField              interface{}
+		InterfacePointerField *interface{}
+	}
+
+	type ShouldNotSupportStruct struct {
+		InterfaceArray []interface{}
+	}
+
+	expected := []byte(`ArrayField = [1,2,3]
+InterfacePointerField = "hello world"
+PrimitiveField = "string"
+
+[MapField]
+  key1 = "value1"
+  key2 = false
+
+  [MapField.key3]
+    InnerField = "value3"
+
+[PointerField]
+  InnerField = "yyy"
+
+[[StructArrayField]]
+  InnerField = "s1"
+
+[[StructArrayField]]
+  InnerField = "s2"
+
+[StructField]
+  InnerField = "xxx"
+`)
+
+	var h interface{} = "hello world"
+	if result, err := Marshal(OuterStruct{
+		"string",
+		[]int{1, 2, 3},
+		[]InnerStruct{{"s1"}, {"s2"}},
+		map[string]interface{}{
+			"key1":      "value1",
+			"key2":      false,
+			"key3":      InnerStruct{"value3"},
+			"nil value": nil,
+		},
+		InnerStruct{
+			"xxx",
+		},
+		&InnerStruct{
+			"yyy",
+		},
+		nil,
+		&h,
+	}); err == nil {
+		if !bytes.Equal(result, expected) {
+			t.Errorf("Bad marshal: expected\n----\n%s\n----\ngot\n----\n%s\n----\n", expected, result)
+		}
+	} else {
+		t.Fatal(err)
+	}
+
+	// according to the toml standard, data types of array may not be mixed
+	if _, err := Marshal(ShouldNotSupportStruct{[]interface{}{1, "a", true}}); err == nil {
+		t.Errorf("Should not support []interface{} marshaling")
+	}
+}
+
+func TestUnmarshalToNilInterface(t *testing.T) {
+	toml := []byte(`
+PrimitiveField = "Hello"
+ArrayField = [1,2,3]
+InterfacePointerField = "World"
+
+[StructField]
+Field1 = 123
+Field2 = "Field2"
+
+[MapField]
+MapField1 = [4,5,6]
+MapField2 = {A = "A"}
+MapField3 = false
+
+[[StructArrayField]]
+Name = "Allen"
+Age = 20
+
+[[StructArrayField]]
+Name = "Jack"
+Age = 23
+`)
+
+	type OuterStruct struct {
+		PrimitiveField        interface{}
+		ArrayField            interface{}
+		StructArrayField      interface{}
+		MapField              map[string]interface{}
+		StructField           interface{}
+		NilField              interface{}
+		InterfacePointerField *interface{}
+	}
+
+	var s interface{} = "World"
+	expected := OuterStruct{
+		PrimitiveField: "Hello",
+		ArrayField:     []interface{}{int64(1), int64(2), int64(3)},
+		StructField: map[string]interface{}{
+			"Field1": int64(123),
+			"Field2": "Field2",
+		},
+		MapField: map[string]interface{}{
+			"MapField1": []interface{}{int64(4), int64(5), int64(6)},
+			"MapField2": map[string]interface{}{
+				"A": "A",
+			},
+			"MapField3": false,
+		},
+		NilField:              nil,
+		InterfacePointerField: &s,
+		StructArrayField: []map[string]interface{}{
+			{
+				"Name": "Allen",
+				"Age":  int64(20),
+			},
+			{
+				"Name": "Jack",
+				"Age":  int64(23),
+			},
+		},
+	}
+	actual := OuterStruct{}
+	if err := Unmarshal(toml, &actual); err == nil {
+		if !reflect.DeepEqual(actual, expected) {
+			t.Errorf("Bad unmarshal: expected %v, got %v", expected, actual)
+		}
+	} else {
+		t.Fatal(err)
+	}
+}
+
+func TestUnmarshalToNonNilInterface(t *testing.T) {
+	toml := []byte(`
+PrimitiveField = "Allen"
+ArrayField = [1,2,3]
+
+[StructField]
+InnerField = "After1"
+
+[PointerField]
+InnerField = "After2"
+
+[InterfacePointerField]
+InnerField = "After"
+
+[MapField]
+MapField1 = [4,5,6]
+MapField2 = {A = "A"}
+MapField3 = false
+
+[[StructArrayField]]
+InnerField = "After3"
+
+[[StructArrayField]]
+InnerField = "After4"
+`)
+	type InnerStruct struct {
+		InnerField interface{}
+	}
+
+	type OuterStruct struct {
+		PrimitiveField        interface{}
+		ArrayField            interface{}
+		StructArrayField      interface{}
+		MapField              map[string]interface{}
+		StructField           interface{}
+		PointerField          interface{}
+		NilField              interface{}
+		InterfacePointerField *interface{}
+	}
+
+	var s interface{} = InnerStruct{"After"}
+	expected := OuterStruct{
+		PrimitiveField: "Allen",
+		ArrayField:     []int{1, 2, 3},
+		StructField:    InnerStruct{InnerField: "After1"},
+		MapField: map[string]interface{}{
+			"MapField1": []interface{}{int64(4), int64(5), int64(6)},
+			"MapField2": map[string]interface{}{
+				"A": "A",
+			},
+			"MapField3": false,
+		},
+		PointerField:          &InnerStruct{InnerField: "After2"},
+		NilField:              nil,
+		InterfacePointerField: &s,
+		StructArrayField: []InnerStruct{
+			{InnerField: "After3"},
+			{InnerField: "After4"},
+		},
+	}
+	actual := OuterStruct{
+		PrimitiveField: "aaa",
+		ArrayField:     []int{100, 200, 300, 400},
+		StructField:    InnerStruct{InnerField: "Before1"},
+		MapField: map[string]interface{}{
+			"MapField1": []int{4, 5, 6},
+			"MapField2": map[string]string{
+				"B": "BBB",
+			},
+			"MapField3": true,
+		},
+		PointerField:          &InnerStruct{InnerField: "Before2"},
+		NilField:              nil,
+		InterfacePointerField: &s,
+		StructArrayField: []InnerStruct{
+			{InnerField: "Before3"},
+			{InnerField: "Before4"},
+		},
+	}
+	if err := Unmarshal(toml, &actual); err == nil {
+		if !reflect.DeepEqual(actual, expected) {
+			t.Errorf("Bad unmarshal: expected %v, got %v", expected, actual)
+		}
+	} else {
+		t.Fatal(err)
+	}
+}
+
+func TestUnmarshalEmbedTree(t *testing.T) {
+	toml := []byte(`
+OuterField1 = "Out"
+OuterField2 = 1024
+
+[TreeField]
+InnerField1 = "In"
+InnerField2 = 2048
+
+	[TreeField.EmbedStruct]
+		EmbedField = "Embed"
+
+`)
+	type InnerStruct struct {
+		InnerField1 string
+		InnerField2 int
+		EmbedStruct struct{
+			EmbedField string
+		}
+	}
+
+	type OuterStruct struct {
+		OuterField1 string
+		OuterField2 int
+		TreeField *Tree
+	}
+
+	out := OuterStruct{}
+	actual := InnerStruct{}
+	expected := InnerStruct{
+		"In",
+		2048,
+		struct{
+			EmbedField string
+		}{
+			EmbedField:"Embed",
+		},
+	}
+	if err := Unmarshal(toml, &out); err != nil {
+		t.Fatal(err)
+	}
+	if err := out.TreeField.Unmarshal(&actual); err != nil {
+		t.Fatal(err)
+	}
+
+	if !reflect.DeepEqual(actual, expected){
+		t.Errorf("Bad unmarshal: expected %v, got %v", expected, actual)
+	}
+}

parser_test.go

@@ -581,6 +581,39 @@ func TestDoubleInlineGroup(t *testing.T) {
 	})
 }
 
+func TestNestedInlineGroup(t *testing.T) {
+	tree, err := Load("out = {block0 = {x = 99, y = 100}, block1 = {p = \"999\", q = \"1000\"}}")
+	assertTree(t, tree, err, map[string]interface{}{
+		"out": map[string]interface{}{
+			"block0": map[string]interface{}{
+				"x": int64(99),
+				"y": int64(100),
+			},
+			"block1": map[string]interface{}{
+				"p": "999",
+				"q": "1000",
+			},
+		},
+	})
+}
+
+func TestArrayInNestedInlineGroup(t *testing.T) {
+	tree, err := Load(`image = {name = "xxx", palette = {id = 100, colors = ["red", "blue", "green"]}}`)
+	assertTree(t, tree, err, map[string]interface{}{
+		"image": map[string]interface{}{
+			"name": "xxx",
+			"palette": map[string]interface{}{
+				"id": int64(100),
+				"colors": []string{
+					"red",
+					"blue",
+					"green",
+				},
+			},
+		},
+	})
+}
+
 func TestExampleInlineGroup(t *testing.T) {
 	tree, err := Load(`name = { first = "Tom", last = "Preston-Werner" }
 point = { x = 1, y = 2 }`)
@@ -864,7 +897,7 @@ func TestTomlValueStringRepresentation(t *testing.T) {
 			"[\"gamma\",\"delta\"]"},
 		{nil, ""},
 	} {
-		result, err := tomlValueStringRepresentation(item.Value, "", false)
+		result, err := tomlValueStringRepresentation(item.Value, "", "", false)
 		if err != nil {
 			t.Errorf("Test %d - unexpected error: %s", idx, err)
 		}

toml.go

@@ -222,8 +222,12 @@ func (t *Tree) SetPathWithOptions(keys []string, opts SetOptions, value interfac
 	switch v := value.(type) {
 	case *Tree:
 		v.comment = opts.Comment
+		v.commented = opts.Commented
 		toInsert = value
 	case []*Tree:
+		for i := range v {
+			v[i].commented = opts.Commented
+		}
 		toInsert = value
 	case *tomlValue:
 		v.comment = opts.Comment

tomltree_write.go

@@ -28,9 +28,10 @@ type sortNode struct {
 // Encodes a string to a TOML-compliant multi-line string value
 // This function is a clone of the existing encodeTomlString function, except that whitespace characters
 // are preserved. Quotation marks and backslashes are also not escaped.
-func encodeMultilineTomlString(value string) string {
+func encodeMultilineTomlString(value string, commented string) string {
 	var b bytes.Buffer
 
+	b.WriteString(commented)
 	for _, rr := range value {
 		switch rr {
 		case '\b':
@@ -38,7 +39,7 @@ func encodeMultilineTomlString(value string) string {
 		case '\t':
 			b.WriteString("\t")
 		case '\n':
-			b.WriteString("\n")
+			b.WriteString("\n" + commented)
 		case '\f':
 			b.WriteString(`\f`)
 		case '\r':
@@ -91,7 +92,7 @@ func encodeTomlString(value string) string {
 	return b.String()
 }
 
-func tomlValueStringRepresentation(v interface{}, indent string, arraysOneElementPerLine bool) (string, error) {
+func tomlValueStringRepresentation(v interface{}, commented string, indent string, arraysOneElementPerLine bool) (string, error) {
 	// this interface check is added to dereference the change made in the writeTo function.
 	// That change was made to allow this function to see formatting options.
 	tv, ok := v.(*tomlValue)
@@ -123,12 +124,12 @@ func tomlValueStringRepresentation(v interface{}, indent string, arraysOneElemen
 		return strings.ToLower(strconv.FormatFloat(value, 'f', -1, bits)), nil
 	case string:
 		if tv.multiline {
-			return "\"\"\"\n" + encodeMultilineTomlString(value) + "\"\"\"", nil
+			return "\"\"\"\n" + encodeMultilineTomlString(value, commented) + "\"\"\"", nil
 		}
 		return "\"" + encodeTomlString(value) + "\"", nil
 	case []byte:
 		b, _ := v.([]byte)
-		return tomlValueStringRepresentation(string(b), indent, arraysOneElementPerLine)
+		return tomlValueStringRepresentation(string(b), commented, indent, arraysOneElementPerLine)
 	case bool:
 		if value {
 			return "true", nil
@@ -152,7 +153,7 @@ func tomlValueStringRepresentation(v interface{}, indent string, arraysOneElemen
 		var values []string
 		for i := 0; i < rv.Len(); i++ {
 			item := rv.Index(i).Interface()
-			itemRepr, err := tomlValueStringRepresentation(item, indent, arraysOneElementPerLine)
+			itemRepr, err := tomlValueStringRepresentation(item, commented, indent, arraysOneElementPerLine)
 			if err != nil {
 				return "", err
 			}
@@ -166,12 +167,12 @@ func tomlValueStringRepresentation(v interface{}, indent string, arraysOneElemen
 
 			for _, value := range values {
 				stringBuffer.WriteString(valueIndent)
-				stringBuffer.WriteString(value)
+				stringBuffer.WriteString(commented + value)
 				stringBuffer.WriteString(`,`)
 				stringBuffer.WriteString("\n")
 			}
 
-			stringBuffer.WriteString(indent + "]")
+			stringBuffer.WriteString(indent + commented + "]")
 
 			return stringBuffer.String(), nil
 		}
@@ -270,10 +271,10 @@ func sortAlphabetical(t *Tree) (vals []sortNode) {
 }
 
 func (t *Tree) writeTo(w io.Writer, indent, keyspace string, bytesCount int64, arraysOneElementPerLine bool) (int64, error) {
-	return t.writeToOrdered(w, indent, keyspace, bytesCount, arraysOneElementPerLine, OrderAlphabetical)
+	return t.writeToOrdered(w, indent, keyspace, bytesCount, arraysOneElementPerLine, OrderAlphabetical, false)
 }
 
-func (t *Tree) writeToOrdered(w io.Writer, indent, keyspace string, bytesCount int64, arraysOneElementPerLine bool, ord marshalOrder) (int64, error) {
+func (t *Tree) writeToOrdered(w io.Writer, indent, keyspace string, bytesCount int64, arraysOneElementPerLine bool, ord marshalOrder, parentCommented bool) (int64, error) {
 	var orderedVals []sortNode
 
 	switch ord {
@@ -293,10 +294,6 @@ func (t *Tree) writeToOrdered(w io.Writer, indent, keyspace string, bytesCount i
 			if keyspace != "" {
 				combinedKey = keyspace + "." + combinedKey
 			}
-			var commented string
-			if t.commented {
-				commented = "# "
-			}
 
 			switch node := v.(type) {
 			// node has to be of those two types given how keys are sorted above
@@ -317,24 +314,33 @@ func (t *Tree) writeToOrdered(w io.Writer, indent, keyspace string, bytesCount i
 						return bytesCount, errc
 					}
 				}
+
+				var commented string
+				if parentCommented || t.commented || tv.commented {
+					commented = "# "
+				}
 				writtenBytesCount, err := writeStrings(w, "\n", indent, commented, "[", combinedKey, "]\n")
 				bytesCount += int64(writtenBytesCount)
 				if err != nil {
 					return bytesCount, err
 				}
-				bytesCount, err = node.writeToOrdered(w, indent+"  ", combinedKey, bytesCount, arraysOneElementPerLine, ord)
+				bytesCount, err = node.writeToOrdered(w, indent+"  ", combinedKey, bytesCount, arraysOneElementPerLine, ord, parentCommented || t.commented || tv.commented)
 				if err != nil {
 					return bytesCount, err
 				}
 			case []*Tree:
 				for _, subTree := range node {
+					var commented string
+					if parentCommented || t.commented || subTree.commented {
+						commented = "# "
+					}
 					writtenBytesCount, err := writeStrings(w, "\n", indent, commented, "[[", combinedKey, "]]\n")
 					bytesCount += int64(writtenBytesCount)
 					if err != nil {
 						return bytesCount, err
 					}
 
-					bytesCount, err = subTree.writeToOrdered(w, indent+"  ", combinedKey, bytesCount, arraysOneElementPerLine, ord)
+					bytesCount, err = subTree.writeToOrdered(w, indent+"  ", combinedKey, bytesCount, arraysOneElementPerLine, ord, parentCommented || t.commented || subTree.commented)
 					if err != nil {
 						return bytesCount, err
 					}
@@ -347,7 +353,11 @@ func (t *Tree) writeToOrdered(w io.Writer, indent, keyspace string, bytesCount i
 				return bytesCount, fmt.Errorf("invalid value type at %s: %T", k, t.values[k])
 			}
 
-			repr, err := tomlValueStringRepresentation(v, indent, arraysOneElementPerLine)
+			var commented string
+			if parentCommented || t.commented || v.commented {
+				commented = "# "
+			}
+			repr, err := tomlValueStringRepresentation(v, commented, indent, arraysOneElementPerLine)
 			if err != nil {
 				return bytesCount, err
 			}
@@ -365,10 +375,6 @@ func (t *Tree) writeToOrdered(w io.Writer, indent, keyspace string, bytesCount i
 				}
 			}
 
-			var commented string
-			if v.commented {
-				commented = "# "
-			}
 			quotedKey := quoteKeyIfNeeded(k)
 			writtenBytesCount, err := writeStrings(w, indent, commented, quotedKey, " = ", repr, "\n")
 			bytesCount += int64(writtenBytesCount)