go-yaml/encode_test.go

package yaml_test

import (
	"bytes"
	"fmt"
	"math"
	"strconv"
	"testing"

	"github.com/goccy/go-yaml"
)

func TestEncoder(t *testing.T) {
	tests := []struct {
		source string
		value  interface{}
	}{
		{
			"null\n",
			(*struct{})(nil),
		},
		{
			"v: hi\n",
			map[string]string{"v": "hi"},
		},
		{
			"v: \"true\"\n",
			map[string]string{"v": "true"},
		},
		{
			"v: \"false\"\n",
			map[string]string{"v": "false"},
		},
		{
			"v: true\n",
			map[string]interface{}{"v": true},
		},
		{
			"v: false\n",
			map[string]bool{"v": false},
		},
		{
			"v: 10\n",
			map[string]int{"v": 10},
		},
		{
			"v: -10\n",
			map[string]int{"v": -10},
		},
		{
			"v: 4294967296\n",
			map[string]int{"v": 4294967296},
		},
		{
			"v: 0.1\n",
			map[string]interface{}{"v": 0.1},
		},
		{
			"v: 0.99\n",
			map[string]float32{"v": 0.99},
		},
		{
			"v: -0.1\n",
			map[string]float64{"v": -0.1},
		},
		{
			"v: 1.0\n",
			map[string]float64{"v": 1.0},
		},
		{
			"v: .inf\n",
			map[string]interface{}{"v": math.Inf(0)},
		},
		{
			"v: -.inf\n",
			map[string]interface{}{"v": math.Inf(-1)},
		},
		{
			"v: .nan\n",
			map[string]interface{}{"v": math.NaN()},
		},
		{
			"v: null\n",
			map[string]interface{}{"v": nil},
		},
		{
			"v: \"\"\n",
			map[string]string{"v": ""},
		},
		{
			"v:\n- A\n- B\n",
			map[string][]string{"v": {"A", "B"}},
		},
		{
			"a: -\n",
			map[string]string{"a": "-"},
		},
		{
			"123\n",
			123,
		},
		{
			"hello: world\n",
			map[string]string{"hello": "world"},
		},
		{
			"v:\n- A\n- 1\n- B:\n  - 2\n  - 3\n",
			map[string]interface{}{
				"v": []interface{}{
					"A",
					1,
					map[string][]int{
						"B": {2, 3},
					},
				},
			},
		},
		{
			"a:\n  b: c\n",
			map[string]interface{}{
				"a": map[string]string{
					"b": "c",
				},
			},
		},
		{
			"t2: 2018-01-09T10:40:47Z\nt4: 2098-01-09T10:40:47Z\n",
			map[string]string{
				"t2": "2018-01-09T10:40:47Z",
				"t4": "2098-01-09T10:40:47Z",
			},
		},
		{
			"a:\n  b: c\n  d: e\n",
			map[string]interface{}{
				"a": map[string]string{
					"b": "c",
					"d": "e",
				},
			},
		},
		{
			"a: 3s\n",
			map[string]string{
				"a": "3s",
			},
		},
		{
			"a: <foo>\n",
			map[string]string{"a": "<foo>"},
		},
		{
			"a: \"1:1\"\n",
			map[string]string{"a": "1:1"},
		},
		{
			"a: 1.2.3.4\n",
			map[string]string{"a": "1.2.3.4"},
		},
		{
			"a: \"b: c\"\n",
			map[string]string{"a": "b: c"},
		},
		{
			"a: \"Hello #comment\"\n",
			map[string]string{"a": "Hello #comment"},
		},
		{
			"a: 100.5\n",
			map[string]interface{}{
				"a": 100.5,
			},
		},
		{
			"a: \"\\\\0\"\n",
			map[string]string{"a": "\\0"},
		},
		{
			"a: 1\nb: 2\nc: 3\nd: 4\nsub:\n  e: 5\n",
			map[string]interface{}{
				"a": 1,
				"b": 2,
				"c": 3,
				"d": 4,
				"sub": map[string]int{
					"e": 5,
				},
			},
		},

		{
			"a: b\nc: d\n",
			struct {
				A string
				C string `yaml:"c"`
			}{
				"b", "d",
			},
		},
		{
			"a: 1\n",
			struct {
				A int
				B int `yaml:"-"`
			}{
				1, 0,
			},
		},

		// Conditional flag
		{
			"a: 1\n",
			struct {
				A int "a,omitempty"
				B int "b,omitempty"
			}{1, 0},
		},
		{
			"{}\n",
			struct {
				A int "a,omitempty"
				B int "b,omitempty"
			}{0, 0},
		},

		{
			"a: {x: 1}\n",
			struct {
				A *struct{ X, y int } "a,omitempty,flow"
			}{&struct{ X, y int }{1, 2}},
		},

		{
			"{}\n",
			struct {
				A *struct{ X, y int } "a,omitempty,flow"
			}{nil},
		},

		{
			"a: {x: 0}\n",
			struct {
				A *struct{ X, y int } "a,omitempty,flow"
			}{&struct{ X, y int }{}},
		},

		{
			"a: {x: 1}\n",
			struct {
				A struct{ X, y int } "a,omitempty,flow"
			}{struct{ X, y int }{1, 2}},
		},
		{
			"{}\n",
			struct {
				A struct{ X, y int } "a,omitempty,flow"
			}{struct{ X, y int }{0, 1}},
		},
		{
			"a: 1.0\n",
			struct {
				A float64 "a,omitempty"
				B float64 "b,omitempty"
			}{1, 0},
		},

		// Flow flag
		{
			"a: [1, 2]\n",
			struct {
				A []int "a,flow"
			}{[]int{1, 2}},
		},
		{
			"a: {b: c, d: e}\n",
			&struct {
				A map[string]string "a,flow"
			}{map[string]string{"b": "c", "d": "e"}},
		},
		{
			"a: {b: c, d: e}\n",
			struct {
				A struct {
					B, D string
				} "a,flow"
			}{struct{ B, D string }{"c", "e"}},
		},

		// Multi bytes
		{
			"v: あいうえお\n",
			map[string]string{"v": "あいうえお"},
		},
	}
	for _, test := range tests {
		var buf bytes.Buffer
		enc := yaml.NewEncoder(&buf)
		if err := enc.Encode(test.value); err != nil {
			t.Fatalf("%+v", err)
		}
		if test.source != buf.String() {
			t.Fatalf("expect = [%s], actual = [%s]", test.source, buf.String())
		}
	}
}

func TestEncodeWithAnchorAndAlias(t *testing.T) {
	var buf bytes.Buffer
	enc := yaml.NewEncoder(&buf)
	type T struct {
		A int
		B string
	}
	var v struct {
		A *T `yaml:"a,anchor=c"`
		B *T `yaml:"b,alias=c"`
	}
	v.A = &T{A: 1, B: "hello"}
	v.B = v.A
	if err := enc.Encode(v); err != nil {
		t.Fatalf("%+v", err)
	}
	expect := "a: &c\n  a: 1\n  b: hello\nb: *c\n"
	if expect != buf.String() {
		t.Fatalf("expect = [%s], actual = [%s]", expect, buf.String())
	}
}

func TestEncodeWithAutoAlias(t *testing.T) {
	var buf bytes.Buffer
	enc := yaml.NewEncoder(&buf)
	type T struct {
		I int
		S string
	}
	var v struct {
		A *T `yaml:"a,anchor=a"`
		B *T `yaml:"b,anchor=b"`
		C *T `yaml:"c,alias"`
		D *T `yaml:"d,alias"`
	}
	v.A = &T{I: 1, S: "hello"}
	v.B = &T{I: 2, S: "world"}
	v.C = v.A
	v.D = v.B
	if err := enc.Encode(v); err != nil {
		t.Fatalf("%+v", err)
	}
	expect := `a: &a
  i: 1
  s: hello
b: &b
  i: 2
  s: world
c: *a
d: *b
`
	if expect != buf.String() {
		t.Fatalf("expect = [%s], actual = [%s]", expect, buf.String())
	}
}

func TestEncodeWithImplicitAnchorAndAlias(t *testing.T) {
	var buf bytes.Buffer
	enc := yaml.NewEncoder(&buf)
	type T struct {
		I int
		S string
	}
	var v struct {
		A *T `yaml:"a,anchor"`
		B *T `yaml:"b,anchor"`
		C *T `yaml:"c,alias"`
		D *T `yaml:"d,alias"`
	}
	v.A = &T{I: 1, S: "hello"}
	v.B = &T{I: 2, S: "world"}
	v.C = v.A
	v.D = v.B
	if err := enc.Encode(v); err != nil {
		t.Fatalf("%+v", err)
	}
	expect := `a: &a
  i: 1
  s: hello
b: &b
  i: 2
  s: world
c: *a
d: *b
`
	if expect != buf.String() {
		t.Fatalf("expect = [%s], actual = [%s]", expect, buf.String())
	}
}

func TestEncodeWithMerge(t *testing.T) {
	type Person struct {
		*Person `yaml:",omitempty,inline,alias"`
		Name    string `yaml:",omitempty"`
		Age     int    `yaml:",omitempty"`
	}
	defaultPerson := &Person{
		Name: "John Smith",
		Age:  20,
	}
	people := []*Person{
		{
			Person: defaultPerson,
			Name:   "Ken",
			Age:    10,
		},
		{
			Person: defaultPerson,
		},
	}
	var doc struct {
		Default *Person   `yaml:"default,anchor"`
		People  []*Person `yaml:"people"`
	}
	doc.Default = defaultPerson
	doc.People = people
	var buf bytes.Buffer
	enc := yaml.NewEncoder(&buf)
	if err := enc.Encode(doc); err != nil {
		t.Fatalf("%+v", err)
	}
	expect := `default: &default
  name: John Smith
  age: 20
people:
- <<: *default
  name: Ken
  age: 10
- <<: *default
`
	if expect != buf.String() {
		t.Fatalf("expect = [%s], actual = [%s]", expect, buf.String())
	}
}

func TestEncoder_Inline(t *testing.T) {
	type base struct {
		A int
		B string
	}
	var buf bytes.Buffer
	enc := yaml.NewEncoder(&buf)
	if err := enc.Encode(struct {
		*base `yaml:",inline"`
		C     bool
	}{
		base: &base{
			A: 1,
			B: "hello",
		},
		C: true,
	}); err != nil {
		t.Fatalf("%+v", err)
	}
	expect := `
a: 1
b: hello
c: true
`
	actual := "\n" + buf.String()
	if expect != actual {
		t.Fatalf("inline marshal error: expect=[%s] actual=[%s]", expect, actual)
	}
}

func TestEncoder_InlineAndConflictKey(t *testing.T) {
	type base struct {
		A int
		B string
	}
	var buf bytes.Buffer
	enc := yaml.NewEncoder(&buf)
	if err := enc.Encode(struct {
		*base `yaml:",inline"`
		A     int // conflict
		C     bool
	}{
		base: &base{
			A: 1,
			B: "hello",
		},
		A: 0, // default value
		C: true,
	}); err != nil {
		t.Fatalf("%+v", err)
	}
	expect := `
b: hello
a: 0
c: true
`
	actual := "\n" + buf.String()
	if expect != actual {
		t.Fatalf("inline marshal error: expect=[%s] actual=[%s]", expect, actual)
	}
}

func TestEncoder_Flow(t *testing.T) {
	var buf bytes.Buffer
	enc := yaml.NewEncoder(&buf, yaml.Flow(true))
	var v struct {
		A int
		B string
		C struct {
			D int
			E string
		}
		F []int
	}
	v.A = 1
	v.B = "hello"
	v.C.D = 3
	v.C.E = "world"
	v.F = []int{1, 2}
	if err := enc.Encode(v); err != nil {
		t.Fatalf("%+v", err)
	}
	expect := `
{a: 1, b: hello, c: {d: 3, e: world}, f: [1, 2]}
`
	actual := "\n" + buf.String()
	if expect != actual {
		t.Fatalf("flow style marshal error: expect=[%s] actual=[%s]", expect, actual)
	}
}

func Example_Marshal_ExplicitAnchorAlias() {
	type T struct {
		A int
		B string
	}
	var v struct {
		C *T `yaml:"c,anchor=x"`
		D *T `yaml:"d,alias=x"`
	}
	v.C = &T{A: 1, B: "hello"}
	v.D = v.C
	bytes, err := yaml.Marshal(v)
	if err != nil {
		panic(err)
	}
	fmt.Println(string(bytes))
	// OUTPUT:
	//c: &x
	//   a: 1
	//   b: hello
	//d: *x
}

func Example_Marshal_ImplicitAnchorAlias() {
	type T struct {
		I int
		S string
	}
	var v struct {
		A *T `yaml:"a,anchor"`
		B *T `yaml:"b,anchor"`
		C *T `yaml:"c,alias"`
		D *T `yaml:"d,alias"`
	}
	v.A = &T{I: 1, S: "hello"}
	v.B = &T{I: 2, S: "world"}
	v.C = v.A // C has same pointer address to A
	v.D = v.B // D has same pointer address to B
	bytes, err := yaml.Marshal(v)
	if err != nil {
		panic(err)
	}
	fmt.Println(string(bytes))
	// OUTPUT:
	// a: &a
	//   i: 1
	//   s: hello
	// b: &b
	//   i: 2
	//   s: world
	// c: *a
	// d: *b
}

type tMarshal []string

func (t *tMarshal) MarshalYAML() ([]byte, error) {
	var buf bytes.Buffer
	buf.WriteString("tags:\n")
	for i, v := range *t {
		if i == 0 {
			fmt.Fprintf(&buf, "- %s\n", v)
		} else {
			fmt.Fprintf(&buf, "  %s\n", v)
		}
	}
	return buf.Bytes(), nil
}
func Test_Marshaler(t *testing.T) {
	const expected = `- hello-world
`

	// sanity check
	var l []string
	if err := yaml.Unmarshal([]byte(expected), &l); err != nil {
		t.Fatalf("failed to parse string: %s", err)
	}

	buf, err := yaml.Marshal(tMarshal{"hello-world"})
	if err != nil {
		t.Fatalf("failed to marshal: %s", err)
	}

	if string(buf) != expected {
		t.Fatalf("expected '%s', got '%s'", expected, buf)
	}

	t.Logf("%s", buf)
}

type SlowMarshaler struct {
	A string
	B int
}
type FastMarshaler struct {
	A string
	B int
}

func (v SlowMarshaler) MarshalYAML() ([]byte, error) {
	var buf bytes.Buffer
	buf.WriteString("tags:\n")
	buf.WriteString("- slow-marshaler\n")
	buf.WriteString("a: " + v.A + "\n")
	buf.WriteString("b: " + strconv.FormatInt(int64(v.B), 10) + "\n")
	return buf.Bytes(), nil
}

func (v FastMarshaler) MarshalYAML() (interface{}, error) {
	return yaml.MapSlice{
		{"tags", []string{"fast-marshaler"}},
		{"a", v.A},
		{"b", v.B},
	}, nil
}

func Example_MarshalYAML() {
	var slow SlowMarshaler
	slow.A = "Hello slow poke"
	slow.B = 100
	buf, err := yaml.Marshal(slow)
	if err != nil {
		panic(err.Error())
	}

	fmt.Println(string(buf))

	var fast FastMarshaler
	fast.A = "Hello speed demon"
	fast.B = 100
	buf, err = yaml.Marshal(fast)
	if err != nil {
		panic(err.Error())
	}

	fmt.Println(string(buf))
	// OUTPUT:
	// tags:
	// - slow-marshaler
	// a: Hello slow poke
	// b: 100
	//
	// tags:
	// - fast-marshaler
	// a: Hello speed demon
	// b: 100
}