go-toml/unmarshaler_test.go

package toml_test

import (
	"bytes"
	"encoding/json"
	"errors"
	"fmt"
	"math"
	"strconv"
	"strings"
	"testing"
	"time"

	"github.com/pelletier/go-toml/v2"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func ExampleDecoder_SetStrict() {
	type S struct {
		Key1 string
		Key3 string
	}
	doc := `
key1 = "value1"
key2 = "value2"
key3 = "value3"
`
	r := strings.NewReader(doc)
	d := toml.NewDecoder(r)
	d.SetStrict(true)
	s := S{}
	err := d.Decode(&s)

	fmt.Println(err.Error())

	var details *toml.StrictMissingError
	if !errors.As(err, &details) {
		panic(fmt.Sprintf("err should have been a *toml.StrictMissingError, but got %s (%T)", err, err))
	}

	fmt.Println(details.String())
	// Output:
	// strict mode: fields in the document are missing in the target struct
	// 2| key1 = "value1"
	// 3| key2 = "value2"
	//  | ~~~~ missing field
	// 4| key3 = "value3"
}

func ExampleUnmarshal() {
	type MyConfig struct {
		Version int
		Name    string
		Tags    []string
	}

	doc := `
	version = 2
	name = "go-toml"
	tags = ["go", "toml"]
	`

	var cfg MyConfig
	err := toml.Unmarshal([]byte(doc), &cfg)
	if err != nil {
		panic(err)
	}
	fmt.Println("version:", cfg.Version)
	fmt.Println("name:", cfg.Name)
	fmt.Println("tags:", cfg.Tags)

	// Output:
	// version: 2
	// name: go-toml
	// tags: [go toml]
}

type badReader struct{}

func (r *badReader) Read([]byte) (int, error) {
	return 0, fmt.Errorf("testing error")
}

func TestDecodeReaderError(t *testing.T) {
	r := &badReader{}

	dec := toml.NewDecoder(r)
	m := map[string]interface{}{}
	err := dec.Decode(&m)
	require.Error(t, err)
}

// nolint:funlen
func TestUnmarshal_Integers(t *testing.T) {
	examples := []struct {
		desc     string
		input    string
		expected int64
		err      bool
	}{
		{
			desc:     "integer just digits",
			input:    `1234`,
			expected: 1234,
		},
		{
			desc:     "integer zero",
			input:    `0`,
			expected: 0,
		},
		{
			desc:     "integer sign",
			input:    `+99`,
			expected: 99,
		},
		{
			desc:     "integer decimal underscore",
			input:    `123_456`,
			expected: 123456,
		},
		{
			desc:     "integer hex uppercase",
			input:    `0xDEADBEEF`,
			expected: 0xDEADBEEF,
		},
		{
			desc:     "integer hex lowercase",
			input:    `0xdead_beef`,
			expected: 0xDEADBEEF,
		},
		{
			desc:     "integer octal",
			input:    `0o01234567`,
			expected: 0o01234567,
		},
		{
			desc:     "integer binary",
			input:    `0b11010110`,
			expected: 0b11010110,
		},
		{
			desc:  "double underscore",
			input: "12__3",
			err:   true,
		},
		{
			desc:  "starts with underscore",
			input: "_1",
			err:   true,
		},
		{
			desc:  "ends with underscore",
			input: "1_",
			err:   true,
		},
	}

	type doc struct {
		A int64
	}

	for _, e := range examples {
		e := e
		t.Run(e.desc, func(t *testing.T) {
			doc := doc{}
			err := toml.Unmarshal([]byte(`A = `+e.input), &doc)
			if e.err {
				require.Error(t, err)
			} else {
				require.NoError(t, err)
				assert.Equal(t, e.expected, doc.A)
			}
		})
	}
}

//nolint:funlen
func TestUnmarshal_Floats(t *testing.T) {
	examples := []struct {
		desc     string
		input    string
		expected float64
		testFn   func(t *testing.T, v float64)
		err      bool
	}{

		{
			desc:     "float pi",
			input:    `3.1415`,
			expected: 3.1415,
		},
		{
			desc:     "float negative",
			input:    `-0.01`,
			expected: -0.01,
		},
		{
			desc:     "float signed exponent",
			input:    `5e+22`,
			expected: 5e+22,
		},
		{
			desc:     "float exponent lowercase",
			input:    `1e06`,
			expected: 1e06,
		},
		{
			desc:     "float exponent uppercase",
			input:    `-2E-2`,
			expected: -2e-2,
		},
		{
			desc:     "float exponent zero",
			input:    `0e0`,
			expected: 0.0,
		},
		{
			desc:     "float upper exponent zero",
			input:    `0E0`,
			expected: 0.0,
		},
		{
			desc:     "float fractional with exponent",
			input:    `6.626e-34`,
			expected: 6.626e-34,
		},
		{
			desc:     "float underscores",
			input:    `224_617.445_991_228`,
			expected: 224_617.445_991_228,
		},
		{
			desc:     "inf",
			input:    `inf`,
			expected: math.Inf(+1),
		},
		{
			desc:     "inf negative",
			input:    `-inf`,
			expected: math.Inf(-1),
		},
		{
			desc:     "inf positive",
			input:    `+inf`,
			expected: math.Inf(+1),
		},
		{
			desc:  "nan",
			input: `nan`,
			testFn: func(t *testing.T, v float64) {
				t.Helper()
				assert.True(t, math.IsNaN(v))
			},
		},
		{
			desc:  "nan negative",
			input: `-nan`,
			testFn: func(t *testing.T, v float64) {
				t.Helper()
				assert.True(t, math.IsNaN(v))
			},
		},
		{
			desc:  "nan positive",
			input: `+nan`,
			testFn: func(t *testing.T, v float64) {
				t.Helper()
				assert.True(t, math.IsNaN(v))
			},
		},
		{
			desc:  "underscore after integer part",
			input: `1_e2`,
			err:   true,
		},
		{
			desc:  "underscore after integer part",
			input: `1.0_e2`,
			err:   true,
		},
	}

	type doc struct {
		A float64
	}

	for _, e := range examples {
		e := e
		t.Run(e.desc, func(t *testing.T) {
			doc := doc{}
			err := toml.Unmarshal([]byte(`A = `+e.input), &doc)
			if e.err {
				require.Error(t, err)
			} else {
				require.NoError(t, err)
				if e.testFn != nil {
					e.testFn(t, doc.A)
				} else {
					assert.Equal(t, e.expected, doc.A)
				}
			}
		})
	}
}

//nolint:funlen
func TestUnmarshal(t *testing.T) {
	type test struct {
		target   interface{}
		expected interface{}
		err      bool
	}
	examples := []struct {
		skip  bool
		desc  string
		input string
		gen   func() test
	}{
		{
			desc:  "kv string",
			input: `A = "foo"`,
			gen: func() test {
				type doc struct {
					A string
				}

				return test{
					target:   &doc{},
					expected: &doc{A: "foo"},
				}
			},
		},
		{
			desc:  "kv literal string",
			input: `A = 'foo 🙂 '`,
			gen: func() test {
				type doc struct {
					A string
				}

				return test{
					target:   &doc{},
					expected: &doc{A: "foo 🙂 "},
				}
			},
		},
		{
			desc:  "time.time with negative zone",
			input: `a = 1979-05-27T00:32:00-07:00 `, // space intentional
			gen: func() test {
				var v map[string]time.Time

				return test{
					target: &v,
					expected: &map[string]time.Time{
						"a": time.Date(1979, 5, 27, 0, 32, 0, 0, time.FixedZone("", -7*3600)),
					},
				}
			},
		},
		{
			desc:  "time.time with positive zone",
			input: `a = 1979-05-27T00:32:00+07:00`,
			gen: func() test {
				var v map[string]time.Time

				return test{
					target: &v,
					expected: &map[string]time.Time{
						"a": time.Date(1979, 5, 27, 0, 32, 0, 0, time.FixedZone("", 7*3600)),
					},
				}
			},
		},
		{
			desc:  "time.time with zone and fractional",
			input: `a = 1979-05-27T00:32:00.999999-07:00`,
			gen: func() test {
				var v map[string]time.Time

				return test{
					target: &v,
					expected: &map[string]time.Time{
						"a": time.Date(1979, 5, 27, 0, 32, 0, 999999000, time.FixedZone("", -7*3600)),
					},
				}
			},
		},
		{
			desc:  "local datetime into time.Time",
			input: `a = 1979-05-27T00:32:00`,
			gen: func() test {
				type doc struct {
					A time.Time
				}

				return test{
					target: &doc{},
					expected: &doc{
						A: time.Date(1979, 5, 27, 0, 32, 0, 0, time.Local),
					},
				}
			},
		},
		{
			desc:  "local datetime into interface",
			input: `a = 1979-05-27T00:32:00`,
			gen: func() test {
				type doc struct {
					A interface{}
				}

				return test{
					target: &doc{},
					expected: &doc{
						A: toml.LocalDateTime{
							toml.LocalDate{1979, 5, 27},
							toml.LocalTime{0, 32, 0, 0, 0},
						},
					},
				}
			},
		},
		{
			desc:  "local date into interface",
			input: `a = 1979-05-27`,
			gen: func() test {
				type doc struct {
					A interface{}
				}

				return test{
					target: &doc{},
					expected: &doc{
						A: toml.LocalDate{1979, 5, 27},
					},
				}
			},
		},
		{
			desc:  "local leap-day date into interface",
			input: `a = 2020-02-29`,
			gen: func() test {
				type doc struct {
					A interface{}
				}

				return test{
					target: &doc{},
					expected: &doc{
						A: toml.LocalDate{2020, 2, 29},
					},
				}
			},
		},
		{
			desc:  "local-time with nano second",
			input: `a = 12:08:05.666666666`,
			gen: func() test {
				var v map[string]interface{}

				return test{
					target: &v,
					expected: &map[string]interface{}{
						"a": toml.LocalTime{Hour: 12, Minute: 8, Second: 5, Nanosecond: 666666666, Precision: 9},
					},
				}
			},
		},
		{
			desc:  "local-time",
			input: `a = 12:08:05`,
			gen: func() test {
				var v map[string]interface{}

				return test{
					target: &v,
					expected: &map[string]interface{}{
						"a": toml.LocalTime{Hour: 12, Minute: 8, Second: 5},
					},
				}
			},
		},
		{
			desc:  "local-time missing digit",
			input: `a = 12:08:0`,
			gen: func() test {
				var v map[string]interface{}

				return test{
					target: &v,
					err:    true,
				}
			},
		},
		{
			desc:  "local-time extra digit",
			input: `a = 12:08:000`,
			gen: func() test {
				var v map[string]interface{}

				return test{
					target: &v,
					err:    true,
				}
			},
		},
		{
			desc: "issue 475 - space between dots in key",
			input: `fruit. color = "yellow"
					fruit . flavor = "banana"`,
			gen: func() test {
				m := map[string]interface{}{}

				return test{
					target: &m,
					expected: &map[string]interface{}{
						"fruit": map[string]interface{}{
							"color":  "yellow",
							"flavor": "banana",
						},
					},
				}
			},
		},
		{
			desc: "issue 427 - quotation marks in key",
			input: `'"a"' = 1
					"\"b\"" = 2`,
			gen: func() test {
				m := map[string]interface{}{}

				return test{
					target: &m,
					expected: &map[string]interface{}{
						`"a"`: int64(1),
						`"b"`: int64(2),
					},
				}
			},
		},
		{
			desc: "multiline basic string",
			input: `A = """\
					Test"""`,
			gen: func() test {
				type doc struct {
					A string
				}

				return test{
					target:   &doc{},
					expected: &doc{A: "Test"},
				}
			},
		},
		{
			desc:  "multiline literal string with windows newline",
			input: "A = '''\r\nTest'''",
			gen: func() test {
				type doc struct {
					A string
				}

				return test{
					target:   &doc{},
					expected: &doc{A: "Test"},
				}
			},
		},
		{
			desc:  "multiline basic string with windows newline",
			input: "A = \"\"\"\r\nTe\r\nst\"\"\"",
			gen: func() test {
				type doc struct {
					A string
				}

				return test{
					target:   &doc{},
					expected: &doc{A: "Te\r\nst"},
				}
			},
		},
		{
			desc: "multiline basic string escapes",
			input: `A = """
\\\b\f\n\r\t\uffff\U0001D11E"""`,
			gen: func() test {
				type doc struct {
					A string
				}

				return test{
					target:   &doc{},
					expected: &doc{A: "\\\b\f\n\r\t\uffff\U0001D11E"},
				}
			},
		},
		{
			desc:  "basic string escapes",
			input: `A = "\\\b\f\n\r\t\uffff\U0001D11E"`,
			gen: func() test {
				type doc struct {
					A string
				}

				return test{
					target:   &doc{},
					expected: &doc{A: "\\\b\f\n\r\t\uffff\U0001D11E"},
				}
			},
		},
		{
			desc:  "spaces around dotted keys",
			input: "a . b = 1",
			gen: func() test {
				return test{
					target:   &map[string]map[string]interface{}{},
					expected: &map[string]map[string]interface{}{"a": {"b": int64(1)}},
				}
			},
		},
		{
			desc:  "kv bool true",
			input: `A = true`,
			gen: func() test {
				type doc struct {
					A bool
				}

				return test{
					target:   &doc{},
					expected: &doc{A: true},
				}
			},
		},
		{
			desc:  "kv bool false",
			input: `A = false`,
			gen: func() test {
				type doc struct {
					A bool
				}

				return test{
					target:   &doc{A: true},
					expected: &doc{A: false},
				}
			},
		},
		{
			desc:  "string array",
			input: `A = ["foo", "bar"]`,
			gen: func() test {
				type doc struct {
					A []string
				}

				return test{
					target:   &doc{},
					expected: &doc{A: []string{"foo", "bar"}},
				}
			},
		},
		{
			desc:  "long string array into []string",
			input: `A = ["0","1","2","3","4","5","6","7","8","9","10","11","12","13","14","15","16","17"]`,
			gen: func() test {
				type doc struct {
					A []string
				}

				return test{
					target:   &doc{},
					expected: &doc{A: []string{"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15", "16", "17"}},
				}
			},
		},
		{
			desc: "long string array into []interface{}",
			input: `A = ["0","1","2","3","4","5","6","7","8","9","10","11","12","13","14",
"15","16","17"]`,
			gen: func() test {
				type doc struct {
					A []interface{}
				}

				return test{
					target: &doc{},
					expected: &doc{A: []interface{}{"0", "1", "2", "3", "4", "5", "6",
						"7", "8", "9", "10", "11", "12", "13", "14", "15", "16", "17"}},
				}
			},
		},
		{
			desc: "standard table",
			input: `[A]
B = "data"`,
			gen: func() test {
				type A struct {
					B string
				}
				type doc struct {
					A A
				}

				return test{
					target:   &doc{},
					expected: &doc{A: A{B: "data"}},
				}
			},
		},
		{
			desc:  "standard empty table",
			input: `[A]`,
			gen: func() test {
				var v map[string]interface{}

				return test{
					target:   &v,
					expected: &map[string]interface{}{`A`: map[string]interface{}{}},
				}
			},
		},
		{
			desc:  "inline table",
			input: `Name = {First = "hello", Last = "world"}`,
			gen: func() test {
				type name struct {
					First string
					Last  string
				}
				type doc struct {
					Name name
				}

				return test{
					target: &doc{},
					expected: &doc{Name: name{
						First: "hello",
						Last:  "world",
					}},
				}
			},
		},
		{
			desc:  "inline empty table",
			input: `A = {}`,
			gen: func() test {
				var v map[string]interface{}

				return test{
					target:   &v,
					expected: &map[string]interface{}{`A`: map[string]interface{}{}},
				}
			},
		},
		{
			desc:  "inline table inside array",
			input: `Names = [{First = "hello", Last = "world"}, {First = "ab", Last = "cd"}]`,
			gen: func() test {
				type name struct {
					First string
					Last  string
				}
				type doc struct {
					Names []name
				}

				return test{
					target: &doc{},
					expected: &doc{
						Names: []name{
							{
								First: "hello",
								Last:  "world",
							},
							{
								First: "ab",
								Last:  "cd",
							},
						},
					},
				}
			},
		},
		{
			desc:  "into map[string]interface{}",
			input: `A = "foo"`,
			gen: func() test {
				doc := map[string]interface{}{}

				return test{
					target: &doc,
					expected: &map[string]interface{}{
						"A": "foo",
					},
				}
			},
		},
		{
			desc: "multi keys of different types into map[string]interface{}",
			input: `A = "foo"
					B = 42`,
			gen: func() test {
				doc := map[string]interface{}{}

				return test{
					target: &doc,
					expected: &map[string]interface{}{
						"A": "foo",
						"B": int64(42),
					},
				}
			},
		},
		{
			desc:  "slice in a map[string]interface{}",
			input: `A = ["foo", "bar"]`,
			gen: func() test {
				doc := map[string]interface{}{}

				return test{
					target: &doc,
					expected: &map[string]interface{}{
						"A": []interface{}{"foo", "bar"},
					},
				}
			},
		},
		{
			desc:  "string into map[string]string",
			input: `A = "foo"`,
			gen: func() test {
				doc := map[string]string{}

				return test{
					target: &doc,
					expected: &map[string]string{
						"A": "foo",
					},
				}
			},
		},
		{
			desc:  "float64 into map[string]string",
			input: `A = 42.0`,
			gen: func() test {
				doc := map[string]string{}

				return test{
					target: &doc,
					err:    true,
				}
			},
		},
		{
			desc: "one-level one-element array table",
			input: `[[First]]
					Second = "hello"`,
			gen: func() test {
				type First struct {
					Second string
				}
				type Doc struct {
					First []First
				}

				return test{
					target: &Doc{},
					expected: &Doc{
						First: []First{
							{
								Second: "hello",
							},
						},
					},
				}
			},
		},
		{
			desc: "one-level multi-element array table",
			input: `[[Products]]
					Name = "Hammer"
					Sku = 738594937

					[[Products]]  # empty table within the array

					[[Products]]
					Name = "Nail"
					Sku = 284758393

					Color = "gray"`,
			gen: func() test {
				type Product struct {
					Name  string
					Sku   int64
					Color string
				}
				type Doc struct {
					Products []Product
				}

				return test{
					target: &Doc{},
					expected: &Doc{
						Products: []Product{
							{Name: "Hammer", Sku: 738594937},
							{},
							{Name: "Nail", Sku: 284758393, Color: "gray"},
						},
					},
				}
			},
		},
		{
			desc: "one-level multi-element array table to map",
			input: `[[Products]]
					Name = "Hammer"
					Sku = 738594937

					[[Products]]  # empty table within the array

					[[Products]]
					Name = "Nail"
					Sku = 284758393

					Color = "gray"`,
			gen: func() test {
				return test{
					target: &map[string]interface{}{},
					expected: &map[string]interface{}{
						"Products": []interface{}{
							map[string]interface{}{
								"Name": "Hammer",
								"Sku":  int64(738594937),
							},
							map[string]interface{}(nil),
							map[string]interface{}{
								"Name":  "Nail",
								"Sku":   int64(284758393),
								"Color": "gray",
							},
						},
					},
				}
			},
		},
		{
			desc: "sub-table in array table",
			input: `[[Fruits]]
					Name = "apple"

					[Fruits.Physical]  # subtable
					Color = "red"
					Shape = "round"`,
			gen: func() test {
				return test{
					target: &map[string]interface{}{},
					expected: &map[string]interface{}{
						"Fruits": []interface{}{
							map[string]interface{}{
								"Name": "apple",
								"Physical": map[string]interface{}{
									"Color": "red",
									"Shape": "round",
								},
							},
						},
					},
				}
			},
		},
		{
			desc: "multiple sub-table in array tables",
			input: `[[Fruits]]
					Name = "apple"

					[[Fruits.Varieties]]  # nested array of tables
					Name = "red delicious"

					[[Fruits.Varieties]]
					Name = "granny smith"

					[[Fruits]]
					Name = "banana"

					[[Fruits.Varieties]]
					Name = "plantain"`,
			gen: func() test {
				return test{
					target: &map[string]interface{}{},
					expected: &map[string]interface{}{
						"Fruits": []interface{}{
							map[string]interface{}{
								"Name": "apple",
								"Varieties": []interface{}{
									map[string]interface{}{
										"Name": "red delicious",
									},
									map[string]interface{}{
										"Name": "granny smith",
									},
								},
							},
							map[string]interface{}{
								"Name": "banana",
								"Varieties": []interface{}{
									map[string]interface{}{
										"Name": "plantain",
									},
								},
							},
						},
					},
				}
			},
		},
		{
			desc: "multiple sub-table in array tables into structs",
			input: `[[Fruits]]
					Name = "apple"

					[[Fruits.Varieties]]  # nested array of tables
					Name = "red delicious"

					[[Fruits.Varieties]]
					Name = "granny smith"

					[[Fruits]]
					Name = "banana"

					[[Fruits.Varieties]]
					Name = "plantain"`,
			gen: func() test {
				type Variety struct {
					Name string
				}
				type Fruit struct {
					Name      string
					Varieties []Variety
				}
				type doc struct {
					Fruits []Fruit
				}

				return test{
					target: &doc{},
					expected: &doc{
						Fruits: []Fruit{
							{
								Name: "apple",
								Varieties: []Variety{
									{Name: "red delicious"},
									{Name: "granny smith"},
								},
							},
							{
								Name: "banana",
								Varieties: []Variety{
									{Name: "plantain"},
								},
							},
						},
					},
				}
			},
		},
		{
			desc: "array table into interface in struct",
			input: `[[foo]]
			bar = "hello"`,
			gen: func() test {
				type doc struct {
					Foo interface{}
				}
				return test{
					target: &doc{},
					expected: &doc{
						Foo: []interface{}{
							map[string]interface{}{
								"bar": "hello",
							},
						},
					},
				}
			},
		},
		{
			desc: "array table into interface in struct already initialized with right type",
			input: `[[foo]]
			bar = "hello"`,
			gen: func() test {
				type doc struct {
					Foo interface{}
				}
				return test{
					target: &doc{
						Foo: []interface{}{},
					},
					expected: &doc{
						Foo: []interface{}{
							map[string]interface{}{
								"bar": "hello",
							},
						},
					},
				}
			},
		},
		{
			desc: "array table into interface in struct already initialized with wrong type",
			input: `[[foo]]
			bar = "hello"`,
			gen: func() test {
				type doc struct {
					Foo interface{}
				}
				return test{
					target: &doc{
						Foo: []string{},
					},
					expected: &doc{
						Foo: []interface{}{
							map[string]interface{}{
								"bar": "hello",
							},
						},
					},
				}
			},
		},
		{
			desc:  "unexported struct fields are ignored",
			input: `foo = "bar"`,
			gen: func() test {
				type doc struct {
					foo string
				}
				return test{
					target:   &doc{},
					expected: &doc{},
				}
			},
		},
		{
			desc: "array table into nil ptr",
			input: `[[foo]]
			bar = "hello"`,
			gen: func() test {
				type doc struct {
					Foo *[]interface{}
				}
				return test{
					target: &doc{},
					expected: &doc{
						Foo: &[]interface{}{
							map[string]interface{}{
								"bar": "hello",
							},
						},
					},
				}
			},
		},
		{
			desc: "array table into nil ptr of invalid type",
			input: `[[foo]]
			bar = "hello"`,
			gen: func() test {
				type doc struct {
					Foo *string
				}
				return test{
					target: &doc{},
					err:    true,
				}
			},
		},
		{
			desc: "array table with intermediate ptr",
			input: `[[foo.bar]]
			bar = "hello"`,
			gen: func() test {
				type doc struct {
					Foo *map[string]interface{}
				}
				return test{
					target: &doc{},
					expected: &doc{
						Foo: &map[string]interface{}{
							"bar": []interface{}{
								map[string]interface{}{
									"bar": "hello",
								},
							},
						},
					},
				}
			},
		},
		{
			desc:  "unmarshal array into interface that contains a slice",
			input: `a = [1,2,3]`,
			gen: func() test {
				type doc struct {
					A interface{}
				}
				return test{
					target: &doc{
						A: []string{},
					},
					expected: &doc{
						A: []interface{}{
							int64(1),
							int64(2),
							int64(3),
						},
					},
				}
			},
		},
		{
			desc:  "unmarshal array into interface that contains a []interface{}",
			input: `a = [1,2,3]`,
			gen: func() test {
				type doc struct {
					A interface{}
				}
				return test{
					target: &doc{
						A: []interface{}{},
					},
					expected: &doc{
						A: []interface{}{
							int64(1),
							int64(2),
							int64(3),
						},
					},
				}
			},
		},
		{
			desc:  "unmarshal key into map with existing value",
			input: `a = "new"`,
			gen: func() test {
				return test{
					target:   &map[string]interface{}{"a": "old"},
					expected: &map[string]interface{}{"a": "new"},
				}
			},
		},
		{
			desc:  "unmarshal key into map with existing value",
			input: `a.b = "new"`,
			gen: func() test {
				type doc struct {
					A interface{}
				}
				return test{
					target: &doc{},
					expected: &doc{
						A: map[string]interface{}{
							"b": "new",
						},
					},
				}
			},
		},
		{
			desc:  "unmarshal array into struct field with existing array",
			input: `a = [1,2]`,
			gen: func() test {
				type doc struct {
					A []int
				}
				return test{
					target: &doc{},
					expected: &doc{
						A: []int{1, 2},
					},
				}
			},
		},
		{
			desc:  "unmarshal inline table into map",
			input: `a = {b="hello"}`,
			gen: func() test {
				type doc struct {
					A map[string]interface{}
				}
				return test{
					target: &doc{},
					expected: &doc{
						A: map[string]interface{}{
							"b": "hello",
						},
					},
				}
			},
		},
		{
			desc:  "unmarshal inline table into map of incorrect type",
			input: `a = {b="hello"}`,
			gen: func() test {
				type doc struct {
					A map[string]int
				}
				return test{
					target: &doc{},
					err:    true,
				}
			},
		},
		{
			desc:  "slice pointer in slice pointer",
			input: `A = ["Hello"]`,
			gen: func() test {
				type doc struct {
					A *[]*string
				}
				hello := "Hello"

				return test{
					target: &doc{},
					expected: &doc{
						A: &[]*string{&hello},
					},
				}
			},
		},
		{
			desc:  "interface holding a string",
			input: `A = "Hello"`,
			gen: func() test {
				type doc struct {
					A interface{}
				}
				return test{
					target: &doc{},
					expected: &doc{
						A: "Hello",
					},
				}
			},
		},
		{
			desc:  "map of bools",
			input: `A = true`,
			gen: func() test {
				return test{
					target:   &map[string]bool{},
					expected: &map[string]bool{"A": true},
				}
			},
		},
		{
			desc:  "map of int64",
			input: `A = 42`,
			gen: func() test {
				return test{
					target:   &map[string]int64{},
					expected: &map[string]int64{"A": 42},
				}
			},
		},
		{
			desc:  "map of float64",
			input: `A = 4.2`,
			gen: func() test {
				return test{
					target:   &map[string]float64{},
					expected: &map[string]float64{"A": 4.2},
				}
			},
		},
		{
			desc:  "array of int in map",
			input: `A = [1,2,3]`,
			gen: func() test {
				return test{
					target:   &map[string][3]int{},
					expected: &map[string][3]int{"A": {1, 2, 3}},
				}
			},
		},
		{
			desc:  "array of int in map with too many elements",
			input: `A = [1,2,3,4,5]`,
			gen: func() test {
				return test{
					target:   &map[string][3]int{},
					expected: &map[string][3]int{"A": {1, 2, 3}},
				}
			},
		},
		{
			desc:  "array of int in map with invalid element",
			input: `A = [1,2,false]`,
			gen: func() test {
				return test{
					target: &map[string][3]int{},
					err:    true,
				}
			},
		},
		{
			desc: "nested arrays",
			input: `
			[[A]]
			[[A.B]]
			C = 1
			[[A]]
			[[A.B]]
			C = 2`,
			gen: func() test {
				type leaf struct {
					C int
				}
				type inner struct {
					B [2]leaf
				}
				type s struct {
					A [2]inner
				}
				return test{
					target: &s{},
					expected: &s{A: [2]inner{
						{B: [2]leaf{
							{C: 1},
						}},
						{B: [2]leaf{
							{C: 2},
						}},
					}},
				}
			},
		},
		{
			desc: "nested arrays too many",
			input: `
			[[A]]
			[[A.B]]
			C = 1
			[[A.B]]
			C = 2`,
			gen: func() test {
				type leaf struct {
					C int
				}
				type inner struct {
					B [1]leaf
				}
				type s struct {
					A [1]inner
				}
				return test{
					target: &s{},
					err:    true,
				}
			},
		},
		{
			desc:  "empty array table in interface{}",
			input: `[[products]]`,
			gen: func() test {
				return test{
					target: &map[string]interface{}{},
					expected: &map[string]interface{}{
						"products": []interface{}{
							map[string]interface{}(nil),
						},
					},
				}
			},
		},
		{
			desc:  "into map with invalid key type",
			input: `A = "hello"`,
			gen: func() test {
				return test{
					target: &map[int]string{},
					err:    true,
				}
			},
		},
		{
			desc:  "into map with convertible key type",
			input: `A = "hello"`,
			gen: func() test {
				type foo string
				return test{
					target: &map[foo]string{},
					expected: &map[foo]string{
						"A": "hello",
					},
				}
			},
		},
		{
			desc:  "array of int in struct",
			input: `A = [1,2,3]`,
			gen: func() test {
				type s struct {
					A [3]int
				}
				return test{
					target:   &s{},
					expected: &s{A: [3]int{1, 2, 3}},
				}
			},
		},
		{
			desc: "array of int in struct",
			input: `[A]
			b = 42`,
			gen: func() test {
				type s struct {
					A *map[string]interface{}
				}
				return test{
					target:   &s{},
					expected: &s{A: &map[string]interface{}{"b": int64(42)}},
				}
			},
		},
		{
			desc:  "assign bool to float",
			input: `A = true`,
			gen: func() test {
				return test{
					target: &map[string]float64{},
					err:    true,
				}
			},
		},
		{
			desc: "interface holding a struct",
			input: `[A]
					B = "After"`,
			gen: func() test {
				type inner struct {
					B interface{}
				}
				type doc struct {
					A interface{}
				}

				return test{
					target: &doc{
						A: inner{
							B: "Before",
						},
					},
					expected: &doc{
						A: map[string]interface{}{
							"B": "After",
						},
					},
				}
			},
		},
		{
			desc: "array of structs with table arrays",
			input: `[[A]]
			B = "one"
			[[A]]
			B = "two"`,
			gen: func() test {
				type inner struct {
					B string
				}
				type doc struct {
					A [4]inner
				}

				return test{
					target: &doc{},
					expected: &doc{
						A: [4]inner{
							{B: "one"},
							{B: "two"},
						},
					},
				}
			},
		},
		{
			desc:  "windows line endings",
			input: "A = 1\r\n\r\nB = 2",
			gen: func() test {
				doc := map[string]interface{}{}

				return test{
					target: &doc,
					expected: &map[string]interface{}{
						"A": int64(1),
						"B": int64(2),
					},
				}
			},
		},
		{
			desc:  "dangling CR",
			input: "A = 1\r",
			gen: func() test {
				doc := map[string]interface{}{}

				return test{
					target: &doc,
					err:    true,
				}
			},
		},
		{
			desc:  "missing NL after CR",
			input: "A = 1\rB = 2",
			gen: func() test {
				doc := map[string]interface{}{}

				return test{
					target: &doc,
					err:    true,
				}
			},
		},
		{
			desc:  "no newline (#526)",
			input: `a = 1z = 2`,
			gen: func() test {
				m := map[string]interface{}{}

				return test{
					target: &m,
					err:    true,
				}
			},
		},
		{
			desc:  "mismatch types int to string",
			input: `A = 42`,
			gen: func() test {
				type S struct {
					A string
				}
				return test{
					target: &S{},
					err:    true,
				}
			},
		},
		{
			desc:  "mismatch types array of int to interface with non-slice",
			input: `A = [42]`,
			gen: func() test {
				type S struct {
					A string
				}
				return test{
					target: &S{},
					err:    true,
				}
			},
		},
		{
			desc:  "comment with CRLF",
			input: "# foo\r\na=2",
			gen: func() test {
				doc := map[string]interface{}{}

				return test{
					target:   &doc,
					expected: &map[string]interface{}{"a": int64(2)},
				}
			},
		},
		{
			desc:  "comment that looks like a date",
			input: "a=19#9-",
			gen: func() test {
				doc := map[string]interface{}{}

				return test{
					target:   &doc,
					expected: &map[string]interface{}{"a": int64(19)},
				}
			},
		},
		{
			desc:  "comment that looks like a date",
			input: "a=199#-",
			gen: func() test {
				doc := map[string]interface{}{}

				return test{
					target:   &doc,
					expected: &map[string]interface{}{"a": int64(199)},
				}
			},
		},
	}

	for _, e := range examples {
		e := e
		t.Run(e.desc, func(t *testing.T) {
			if e.skip {
				t.Skip()
			}
			test := e.gen()
			if test.err && test.expected != nil {
				panic("invalid test: cannot expect both an error and a value")
			}
			err := toml.Unmarshal([]byte(e.input), test.target)
			if test.err {
				if err == nil {
					t.Log("=>", test.target)
				}
				require.Error(t, err)
			} else {
				require.NoError(t, err)
				assert.Equal(t, test.expected, test.target)
			}
		})
	}
}

func TestUnmarshalOverflows(t *testing.T) {
	examples := []struct {
		t      interface{}
		errors []string
	}{
		{
			t:      &map[string]int32{},
			errors: []string{`-2147483649`, `2147483649`},
		},
		{
			t:      &map[string]int16{},
			errors: []string{`-2147483649`, `2147483649`},
		},
		{
			t:      &map[string]int8{},
			errors: []string{`-2147483649`, `2147483649`},
		},
		{
			t:      &map[string]int{},
			errors: []string{`-19223372036854775808`, `9223372036854775808`},
		},
		{
			t:      &map[string]uint64{},
			errors: []string{`-1`, `18446744073709551616`},
		},
		{
			t:      &map[string]uint32{},
			errors: []string{`-1`, `18446744073709551616`},
		},
		{
			t:      &map[string]uint16{},
			errors: []string{`-1`, `18446744073709551616`},
		},
		{
			t:      &map[string]uint8{},
			errors: []string{`-1`, `18446744073709551616`},
		},
		{
			t:      &map[string]uint{},
			errors: []string{`-1`, `18446744073709551616`},
		},
	}

	for _, e := range examples {
		e := e
		for _, v := range e.errors {
			v := v
			t.Run(fmt.Sprintf("%T %s", e.t, v), func(t *testing.T) {
				doc := "A = " + v
				err := toml.Unmarshal([]byte(doc), e.t)
				t.Log("input:", doc)
				require.Error(t, err)
			})
		}
		t.Run(fmt.Sprintf("%T ok", e.t), func(t *testing.T) {
			doc := "A = 1"
			err := toml.Unmarshal([]byte(doc), e.t)
			t.Log("input:", doc)
			require.NoError(t, err)
		})
	}
}

func TestUnmarshalErrors(t *testing.T) {
	type mystruct struct {
		Bar string
	}

	data := `bar = 42`

	s := mystruct{}
	err := toml.Unmarshal([]byte(data), &s)
	require.Error(t, err)

	require.Equal(t, "toml: cannot decode TOML integer into struct field toml_test.mystruct.Bar of type string", err.Error())
}

func TestUnmarshalInvalidTarget(t *testing.T) {
	x := "foo"
	err := toml.Unmarshal([]byte{}, x)
	require.Error(t, err)

	var m *map[string]interface{}
	err = toml.Unmarshal([]byte{}, m)
	require.Error(t, err)
}

func TestUnmarshalFloat32(t *testing.T) {
	t.Run("fits", func(t *testing.T) {
		doc := "A = 1.2"
		err := toml.Unmarshal([]byte(doc), &map[string]float32{})
		require.NoError(t, err)
	})
	t.Run("overflows", func(t *testing.T) {
		doc := "A = 4.40282346638528859811704183484516925440e+38"
		err := toml.Unmarshal([]byte(doc), &map[string]float32{})
		require.Error(t, err)
	})
}

func TestDecoderStrict(t *testing.T) {
	examples := []struct {
		desc     string
		input    string
		expected string
		target   interface{}
	}{
		{
			desc: "multiple missing root keys",
			input: `
key1 = "value1"
key2 = "missing2"
key3 = "missing3"
key4 = "value4"
`,
			expected: `
2| key1 = "value1"
3| key2 = "missing2"
 | ~~~~ missing field
4| key3 = "missing3"
5| key4 = "value4"
---
2| key1 = "value1"
3| key2 = "missing2"
4| key3 = "missing3"
 | ~~~~ missing field
5| key4 = "value4"
`,
			target: &struct {
				Key1 string
				Key4 string
			}{},
		},
		{
			desc:  "multi-part key",
			input: `a.short.key="foo"`,
			expected: `
1| a.short.key="foo"
 | ~~~~~~~~~~~ missing field
`,
		},
		{
			desc: "missing table",
			input: `
[foo]
bar = 42
`,
			expected: `
2| [foo]
 |  ~~~ missing table
3| bar = 42
`,
		},

		{
			desc: "missing array table",
			input: `
[[foo]]
bar = 42
`,
			expected: `
2| [[foo]]
 |   ~~~ missing table
3| bar = 42
`,
		},
	}

	for _, e := range examples {
		e := e
		t.Run(e.desc, func(t *testing.T) {
			t.Run("strict", func(t *testing.T) {
				r := strings.NewReader(e.input)
				d := toml.NewDecoder(r)
				d.SetStrict(true)
				x := e.target
				if x == nil {
					x = &struct{}{}
				}
				err := d.Decode(x)

				var tsm *toml.StrictMissingError
				if errors.As(err, &tsm) {
					equalStringsIgnoreNewlines(t, e.expected, tsm.String())
				} else {
					t.Fatalf("err should have been a *toml.StrictMissingError, but got %s (%T)", err, err)
				}
			})

			t.Run("default", func(t *testing.T) {
				r := strings.NewReader(e.input)
				d := toml.NewDecoder(r)
				d.SetStrict(false)
				x := e.target
				if x == nil {
					x = &struct{}{}
				}
				err := d.Decode(x)
				require.NoError(t, err)
			})
		})
	}
}

func TestIssue252(t *testing.T) {
	type config struct {
		Val1 string `toml:"val1"`
		Val2 string `toml:"val2"`
	}

	configFile := []byte(
		`
val1 = "test1"
`)

	cfg := &config{
		Val2: "test2",
	}

	err := toml.Unmarshal(configFile, cfg)
	require.NoError(t, err)
	require.Equal(t, "test2", cfg.Val2)
}

func TestIssue287(t *testing.T) {
	b := `y=[[{}]]`
	v := map[string]interface{}{}
	err := toml.Unmarshal([]byte(b), &v)
	require.NoError(t, err)

	expected := map[string]interface{}{
		"y": []interface{}{
			[]interface{}{
				map[string]interface{}{},
			},
		},
	}
	require.Equal(t, expected, v)
}

type (
	Map458   map[string]interface{}
	Slice458 []interface{}
)

func (m Map458) A(s string) Slice458 {
	return m[s].([]interface{})
}

func TestIssue458(t *testing.T) {
	s := []byte(`[[package]]
dependencies = ["regex"]
name = "decode"
version = "0.1.0"`)
	m := Map458{}
	err := toml.Unmarshal(s, &m)
	require.NoError(t, err)
	a := m.A("package")
	expected := Slice458{
		map[string]interface{}{
			"dependencies": []interface{}{"regex"},
			"name":         "decode",
			"version":      "0.1.0",
		},
	}
	assert.Equal(t, expected, a)
}

type Integer484 struct {
	Value int
}

func (i Integer484) MarshalText() ([]byte, error) {
	return []byte(strconv.Itoa(i.Value)), nil
}

func (i *Integer484) UnmarshalText(data []byte) error {
	conv, err := strconv.Atoi(string(data))
	if err != nil {
		return fmt.Errorf("UnmarshalText: %w", err)
	}
	i.Value = conv

	return nil
}

type Config484 struct {
	Integers []Integer484 `toml:"integers"`
}

func TestIssue484(t *testing.T) {
	raw := []byte(`integers = ["1","2","3","100"]`)

	var cfg Config484
	err := toml.Unmarshal(raw, &cfg)
	require.NoError(t, err)
	assert.Equal(t, Config484{
		Integers: []Integer484{{1}, {2}, {3}, {100}},
	}, cfg)
}

func TestIssue494(t *testing.T) {
	data := `
foo = 2021-04-08
bar = 2021-04-08
`

	type s struct {
		Foo time.Time `toml:"foo"`
		Bar time.Time `toml:"bar"`
	}
	ss := new(s)
	err := toml.Unmarshal([]byte(data), ss)
	require.NoError(t, err)
}

func TestIssue508(t *testing.T) {
	type head struct {
		Title string `toml:"title"`
	}

	type text struct {
		head
	}

	b := []byte(`title = "This is a title"`)

	t1 := text{}
	err := toml.Unmarshal(b, &t1)
	require.NoError(t, err)
	require.Equal(t, "This is a title", t1.head.Title)
}

func TestIssue507(t *testing.T) {
	data := []byte{'0', '=', '\n', '0', 'a', 'm', 'e'}
	m := map[string]interface{}{}
	err := toml.Unmarshal(data, &m)
	require.Error(t, err)
}

type uuid [16]byte

func (u *uuid) UnmarshalText(text []byte) (err error) {
	// Note: the original reported issue had a more complex implementation
	// of this function. But the important part is to verify that a
	// non-struct type implementing UnmarshalText works with the unmarshal
	// process.
	placeholder := bytes.Repeat([]byte{0xAA}, 16)
	copy(u[:], placeholder)
	return nil
}

func TestIssue564(t *testing.T) {
	type Config struct {
		ID uuid
	}

	var config Config

	err := toml.Unmarshal([]byte(`id = "0818a52b97b94768941ba1172c76cf6c"`), &config)
	require.NoError(t, err)
	require.Equal(t, uuid{0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA}, config.ID)
}

func TestIssue575(t *testing.T) {
	b := []byte(`
[pkg.cargo]
version = "0.55.0 (5ae8d74b3 2021-06-22)"
git_commit_hash = "a178d0322ce20e33eac124758e837cbd80a6f633"
[pkg.cargo.target.aarch64-apple-darwin]
available = true
url = "https://static.rust-lang.org/dist/2021-07-29/cargo-1.54.0-aarch64-apple-darwin.tar.gz"
hash = "7bac3901d8eb6a4191ffeebe75b29c78bcb270158ec901addb31f588d965d35d"
xz_url = "https://static.rust-lang.org/dist/2021-07-29/cargo-1.54.0-aarch64-apple-darwin.tar.xz"
xz_hash = "5207644fd6379f3e5b8ae60016b854efa55a381b0c363bff7f9b2f25bfccc430"

[pkg.cargo.target.aarch64-pc-windows-msvc]
available = true
url = "https://static.rust-lang.org/dist/2021-07-29/cargo-1.54.0-aarch64-pc-windows-msvc.tar.gz"
hash = "eb8ccd9b1f6312b06dc749c17896fa4e9c163661c273dcb61cd7a48376227f6d"
xz_url = "https://static.rust-lang.org/dist/2021-07-29/cargo-1.54.0-aarch64-pc-windows-msvc.tar.xz"
xz_hash = "1a48f723fea1f17d786ce6eadd9d00914d38062d28fd9c455ed3c3801905b388"
`)

	type target struct {
		XZ_URL string
	}

	type pkg struct {
		Target map[string]target
	}

	type doc struct {
		Pkg map[string]pkg
	}

	var dist doc
	err := toml.Unmarshal(b, &dist)
	require.NoError(t, err)

	expected := doc{
		Pkg: map[string]pkg{
			"cargo": {
				Target: map[string]target{
					"aarch64-apple-darwin": {
						XZ_URL: "https://static.rust-lang.org/dist/2021-07-29/cargo-1.54.0-aarch64-apple-darwin.tar.xz",
					},
					"aarch64-pc-windows-msvc": {
						XZ_URL: "https://static.rust-lang.org/dist/2021-07-29/cargo-1.54.0-aarch64-pc-windows-msvc.tar.xz",
					},
				},
			},
		},
	}

	require.Equal(t, expected, dist)
}

func TestIssue579(t *testing.T) {
	var v interface{}
	err := toml.Unmarshal([]byte(`[foo`), &v)
	require.Error(t, err)
}

func TestIssue581(t *testing.T) {
	var v interface{}
	err := toml.Unmarshal([]byte(`P=[#`), &v)
	require.Error(t, err)
}

func TestIssue585(t *testing.T) {
	var v interface{}
	err := toml.Unmarshal([]byte(`a=1979-05127T 0`), &v)
	require.Error(t, err)
}

func TestIssue586(t *testing.T) {
	var v interface{}
	err := toml.Unmarshal([]byte(`a={ `), &v)
	require.Error(t, err)
}

func TestIssue588(t *testing.T) {
	var v interface{}
	err := toml.Unmarshal([]byte(`a=[1#`), &v)
	require.Error(t, err)
}

// Support lowercase 'T' and 'Z'
func TestIssue600(t *testing.T) {
	var v interface{}
	err := toml.Unmarshal([]byte(`a=1979-05-27t00:32:00z`), &v)
	require.NoError(t, err)
}

func TestIssue596(t *testing.T) {
	var v interface{}
	err := toml.Unmarshal([]byte(`a=1979-05-27T90:+2:99`), &v)
	require.Error(t, err)
}

func TestIssue602(t *testing.T) {
	var v interface{}
	err := toml.Unmarshal([]byte(""), &v)
	require.NoError(t, err)

	var expected interface{} = map[string]interface{}{}

	require.Equal(t, expected, v)
}

func TestIssue623(t *testing.T) {
	definition := struct {
		Things []string
	}{}

	values := `[things]
foo = "bar"`

	err := toml.Unmarshal([]byte(values), &definition)
	require.Error(t, err)
}

func TestIssue631(t *testing.T) {
	v := map[string]interface{}{}
	err := toml.Unmarshal([]byte("\"\\b\u007f\"= 2"), &v)
	require.Error(t, err)
}

func TestIssue658(t *testing.T) {
	var v map[string]interface{}
	err := toml.Unmarshal([]byte("e={b=1,b=4}"), &v)
	require.Error(t, err)
}

func TestIssue662(t *testing.T) {
	var v map[string]interface{}
	err := toml.Unmarshal([]byte("a=[{b=1,b=2}]"), &v)
	require.Error(t, err)
}

func TestIssue666(t *testing.T) {
	var v map[string]interface{}
	err := toml.Unmarshal([]byte("a={}\na={}"), &v)
	require.Error(t, err)
}

func TestIssue677(t *testing.T) {
	doc := `
[Build]
Name = "publication build"

[[Build.Dependencies]]
Name = "command"
Program = "hugo"
`

	type _tomlJob struct {
		Dependencies []map[string]interface{}
	}

	type tomlParser struct {
		Build *_tomlJob
	}

	p := tomlParser{}

	err := toml.Unmarshal([]byte(doc), &p)
	require.NoError(t, err)

	expected := tomlParser{
		Build: &_tomlJob{
			Dependencies: []map[string]interface{}{
				{
					"Name":    "command",
					"Program": "hugo",
				},
			},
		},
	}
	require.Equal(t, expected, p)
}

func TestIssue701(t *testing.T) {
	// Expected behavior:
	// Return an error since a cannot be modified. From the TOML spec:
	//
	// > Inline tables are fully self-contained and define all
	// keys and sub-tables within them. Keys and sub-tables cannot
	// be added outside the braces.

	docs := []string{
		`
a={}
[a.b]
z=0
`,
		`
a={}
[[a.b]]
z=0
`,
	}

	for _, doc := range docs {
		var v interface{}
		err := toml.Unmarshal([]byte(doc), &v)
		assert.Error(t, err)
	}
}

func TestIssue703(t *testing.T) {
	var v interface{}
	err := toml.Unmarshal([]byte("[a]\nx.y=0\n[a.x]"), &v)
	require.Error(t, err)
}

func TestUnmarshalDecodeErrors(t *testing.T) {
	examples := []struct {
		desc string
		data string
		msg  string
	}{
		{
			desc: "local date with invalid digit",
			data: `a = 20x1-05-21`,
		},
		{
			desc: "local time with fractional",
			data: `a = 11:22:33.x`,
		},
		{
			desc: "local time frac precision too large",
			data: `a = 2021-05-09T11:22:33.99999999999`,
		},
		{
			desc: "wrong time offset separator",
			data: `a = 1979-05-27T00:32:00.-07:00`,
		},
		{
			desc: "missing fractional with tz",
			data: `a = 2021-05-09T11:22:33.99999999999`,
		},
		{
			desc: "wrong time offset separator",
			data: `a = 1979-05-27T00:32:00Z07:00`,
		},
		{
			desc: "float with double _",
			data: `flt8 = 224_617.445_991__228`,
		},
		{
			desc: "float with double .",
			data: `flt8 = 1..2`,
		},
		{
			desc: "number with plus sign and leading underscore",
			data: `a = +_0`,
		},
		{
			desc: "number with negative sign and leading underscore",
			data: `a = -_0`,
		},
		{
			desc: "exponent with plus sign and leading underscore",
			data: `a = 0e+_0`,
		},
		{
			desc: "exponent with negative sign and leading underscore",
			data: `a = 0e-_0`,
		},
		{
			desc: "int with wrong base",
			data: `a = 0f2`,
		},
		{
			desc: "int hex with double underscore",
			data: `a = 0xFFF__FFF`,
		},
		{
			desc: "int hex very large",
			data: `a = 0xFFFFFFFFFFFFFFFFF`,
		},
		{
			desc: "int oct with double underscore",
			data: `a = 0o777__77`,
		},
		{
			desc: "int oct very large",
			data: `a = 0o77777777777777777777777`,
		},
		{
			desc: "int bin with double underscore",
			data: `a = 0b111__111`,
		},
		{
			desc: "int bin very large",
			data: `a = 0b11111111111111111111111111111111111111111111111111111111111111111111111111111`,
		},
		{
			desc: "int dec very large",
			data: `a = 999999999999999999999999`,
		},
		{
			desc: "literal string with new lines",
			data: `a = 'hello
world'`,
			msg: `literal strings cannot have new lines`,
		},
		{
			desc: "unterminated literal string",
			data: `a = 'hello`,
			msg:  `unterminated literal string`,
		},
		{
			desc: "unterminated multiline literal string",
			data: `a = '''hello`,
			msg:  `multiline literal string not terminated by '''`,
		},
		{
			desc: "basic string with new lines",
			data: `a = "hello
"`,
			msg: `basic strings cannot have new lines`,
		},
		{
			desc: "basic string with unfinished escape",
			data: `a = "hello \`,
			msg:  `need a character after \`,
		},
		{
			desc: "basic unfinished multiline string",
			data: `a = """hello`,
			msg:  `multiline basic string not terminated by """`,
		},
		{
			desc: "basic unfinished escape in multiline string",
			data: `a = """hello \`,
			msg:  `need a character after \`,
		},
		{
			desc: "malformed local date",
			data: `a = 2021-033-0`,
			msg:  `dates are expected to have the format YYYY-MM-DD`,
		},
		{
			desc: "malformed tz",
			data: `a = 2021-03-30 21:31:00+1`,
			msg:  `invalid date-time timezone`,
		},
		{
			desc: "malformed tz first char",
			data: `a = 2021-03-30 21:31:00:1`,
			msg:  `extra characters at the end of a local date time`,
		},
		{
			desc: "bad char between hours and minutes",
			data: `a = 2021-03-30 213:1:00`,
			msg:  `expecting colon between hours and minutes`,
		},
		{
			desc: "bad char between minutes and seconds",
			data: `a = 2021-03-30 21:312:0`,
			msg:  `expecting colon between minutes and seconds`,
		},
		{
			desc: "invalid hour value",
			data: `a=1979-05-27T90:+2:99`,
			msg:  `hour cannot be greater 23`,
		},
		{
			desc: "invalid minutes value",
			data: `a=1979-05-27T23:+2:99`,
			msg:  `expected digit (0-9)`,
		},
		{
			desc: "invalid seconds value",
			data: `a=1979-05-27T12:45:99`,
			msg:  `seconds cannot be greater 60`,
		},
		{
			desc: `binary with invalid digit`,
			data: `a = 0bf`,
		},
		{
			desc: `invalid i in dec`,
			data: `a = 0i`,
		},
		{
			desc: `invalid n in dec`,
			data: `a = 0n`,
		},
		{
			desc: `invalid unquoted key`,
			data: `a`,
		},
		{
			desc: "dt with tz has no time",
			data: `a = 2021-03-30TZ`,
		},
		{
			desc: "invalid end of array table",
			data: `[[a}`,
		},
		{
			desc: "invalid end of array table two",
			data: `[[a]}`,
		},
		{
			desc: "eof after equal",
			data: `a =`,
		},
		{
			desc: "invalid true boolean",
			data: `a = trois`,
		},
		{
			desc: "invalid false boolean",
			data: `a = faux`,
		},
		{
			desc: "inline table with incorrect separator",
			data: `a = {b=1;}`,
		},
		{
			desc: "inline table with invalid value",
			data: `a = {b=faux}`,
		},
		{
			desc: `incomplete array after whitespace`,
			data: `a = [ `,
		},
		{
			desc: `array with comma first`,
			data: `a = [ ,]`,
		},
		{
			desc: `array staring with incomplete newline`,
			data: "a = [\r]",
		},
		{
			desc: `array with incomplete newline after comma`,
			data: "a = [1,\r]",
		},
		{
			desc: `array with incomplete newline after value`,
			data: "a = [1\r]",
		},
		{
			desc: `invalid unicode in basic multiline string`,
			data: `A = """\u123"""`,
		},
		{
			desc: `invalid long unicode in basic multiline string`,
			data: `A = """\U0001D11"""`,
		},
		{
			desc: `invalid unicode in basic string`,
			data: `A = "\u123"`,
		},
		{
			desc: `invalid long unicode in basic string`,
			data: `A = "\U0001D11"`,
		},
		{
			desc: `invalid escape char basic multiline string`,
			data: `A = """\z"""`,
		},
		{
			desc: `invalid inf`,
			data: `A = ick`,
		},
		{
			desc: `invalid nan`,
			data: `A = non`,
		},
		{
			desc: `invalid character in comment in array`,
			data: "A = [#\x00\n]",
		},
		{
			desc: "invalid utf8 character in long string with no escape sequence",
			data: "a = \"aaaa\x80aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\"",
		},
		{
			desc: "invalid ascii character in long string with no escape sequence",
			data: "a = \"aaaa\x00aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\"",
		},
		{
			desc: "unfinished 2-byte utf8 character in string with no escape sequence",
			data: "a = \"aaaa\xC2\"",
		},
		{
			desc: "unfinished 3-byte utf8 character in string with no escape sequence",
			data: "a = \"aaaa\xE2\x00\x00\"",
		},
		{
			desc: "invalid 3rd byte of 3-byte utf8 character in string with no escape sequence",
			data: "a = \"aaaa\xE2\x80\x00\"",
		},
		{
			desc: "invalid 4rd byte of 4-byte utf8 character in string with no escape sequence",
			data: "a = \"aaaa\xF2\x81\x81\x00\"",
		},
		{
			desc: "unfinished 2-byte utf8 character in literal string",
			data: "a = 'aaa\xC2'",
		},
		{
			desc: "unfinished 3-byte utf8 character in literal string",
			data: "a = 'aaaa\xE2\x00\x00'",
		},
		{
			desc: "invalid 3rd byte of 3-byte utf8 character in literal string",
			data: "a = 'aaaa\xE2\x80\x00'",
		},
		{
			desc: "invalid 4rd byte of 4-byte utf8 character in literal string",
			data: "a = 'aaaa\xF2\x81\x81\x00'",
		},
		{
			desc: "invalid start utf8 character in literal string",
			data: "a = '\x80'",
		},
		{
			desc: "utf8 character with not enough bytes before end in literal string",
			data: "a = '\xEF'",
		},
		{
			desc: "basic string with newline after the first escape code",
			data: "a = \"\\t\n\"",
		},
		{
			desc: "basic string with unfinished escape sequence after the first escape code",
			data: "a = \"\\t\\",
		},
		{
			desc: "basic string with unfinished after the first escape code",
			data: "a = \"\\t",
		},
		{
			desc: "multiline basic string with unfinished escape sequence after the first escape code",
			data: "a = \"\"\"\\t\\",
		},
		{
			desc: `impossible date-day`,
			data: `A = 2021-03-40T23:59:00`,
			msg:  `impossible date`,
		},
		{
			desc: `leap day in non-leap year`,
			data: `A = 2021-02-29T23:59:00`,
			msg:  `impossible date`,
		},
		{
			desc: `missing minute digit`,
			data: `a=17:4::01`,
		},
		{
			desc: `invalid space in year`,
			data: `i=19 7-12-21T10:32:00`,
		},
		{
			desc: `missing nanoseconds digits`,
			data: `a=17:45:56.`,
		},
		{
			desc: `minutes over 60`,
			data: `a=17:99:00`,
		},
		{
			desc: `invalid second`,
			data: `a=17:00::0`,
		},
		{
			desc: `invalid hour`,
			data: `a=1::00:00`,
		},
		{
			desc: `invalid month`,
			data: `a=2021-0--29`,
		},
		{
			desc: `zero is an invalid day`,
			data: `a=2021-11-00`,
		},
		{
			desc: `zero is an invalid month`,
			data: `a=2021-00-11`,
		},
		{
			desc: `invalid number of seconds digits with trailing digit`,
			data: `a=0000-01-01 00:00:000000Z3`,
		},
		{
			desc: `invalid zone offset hours`,
			data: `a=0000-01-01 00:00:00+24:00`,
		},
		{
			desc: `invalid zone offset minutes`,
			data: `a=0000-01-01 00:00:00+00:60`,
		},
		{
			desc: `invalid character in zone offset hours`,
			data: `a=0000-01-01 00:00:00+0Z:00`,
		},
		{
			desc: `invalid character in zone offset minutes`,
			data: `a=0000-01-01 00:00:00+00:0Z`,
		},
		{
			desc: `invalid number of seconds`,
			data: `a=0000-01-01 00:00:00+27000`,
		},
		{
			desc: `carriage return inside basic key`,
			data: "\"\r\"=42",
		},
		{
			desc: `carriage return inside literal key`,
			data: "'\r'=42",
		},
		{
			desc: `carriage return inside basic string`,
			data: "A = \"\r\"",
		},
		{
			desc: `carriage return inside basic multiline string`,
			data: "a=\"\"\"\r\"\"\"",
		},
		{
			desc: `carriage return at the trail of basic multiline string`,
			data: "a=\"\"\"\r",
		},
		{
			desc: `carriage return inside literal string`,
			data: "A = '\r'",
		},
		{
			desc: `carriage return inside multiline literal string`,
			data: "a='''\r'''",
		},
		{
			desc: `carriage return at trail of multiline literal string`,
			data: "a='''\r",
		},
		{
			desc: `carriage return in comment`,
			data: "# this is a test\ra=1",
		},
		{
			desc: `backspace in comment`,
			data: "# this is a test\ba=1",
		},
	}

	for _, e := range examples {
		e := e
		t.Run(e.desc, func(t *testing.T) {
			m := map[string]interface{}{}
			err := toml.Unmarshal([]byte(e.data), &m)
			require.Error(t, err)

			var de *toml.DecodeError
			if !errors.As(err, &de) {
				t.Fatalf("err should have been a *toml.DecodeError, but got %s (%T)", err, err)
			}

			if e.msg != "" {
				t.Log("\n" + de.String())
				require.Equal(t, "toml: "+e.msg, de.Error())
			}
		})
	}
}

func TestUnmarshalTags(t *testing.T) {
	type doc struct {
		Dash   string `toml:"-,"`
		Ignore string `toml:"-"`
		A      string `toml:"hello"`
		B      string `toml:"comma,omitempty"`
	}

	data := `
'-' = "dash"
Ignore = 'me'
hello = 'content'
comma = 'ok'
`

	d := doc{}
	expected := doc{
		Dash:   "dash",
		Ignore: "",
		A:      "content",
		B:      "ok",
	}

	err := toml.Unmarshal([]byte(data), &d)
	require.NoError(t, err)
	require.Equal(t, expected, d)
}

func TestASCIIControlCharacters(t *testing.T) {
	invalidCharacters := []byte{0x7F}
	for c := byte(0x0); c <= 0x08; c++ {
		invalidCharacters = append(invalidCharacters, c)
	}
	for c := byte(0x0B); c <= 0x0C; c++ {
		invalidCharacters = append(invalidCharacters, c)
	}
	for c := byte(0x0E); c <= 0x1F; c++ {
		invalidCharacters = append(invalidCharacters, c)
	}

	type stringType struct {
		Delimiter string
		CanEscape bool
	}

	stringTypes := map[string]stringType{
		"basic":            {Delimiter: "\"", CanEscape: true},
		"basicMultiline":   {Delimiter: "\"\"\"", CanEscape: true},
		"literal":          {Delimiter: "'", CanEscape: false},
		"literalMultiline": {Delimiter: "'''", CanEscape: false},
	}

	checkError := func(t *testing.T, input []byte) {
		t.Helper()
		m := map[string]interface{}{}
		err := toml.Unmarshal(input, &m)
		require.Error(t, err)

		var de *toml.DecodeError
		if !errors.As(err, &de) {
			t.Fatalf("err should have been a *toml.DecodeError, but got %s (%T)", err, err)
		}
	}

	for name, st := range stringTypes {
		t.Run(name, func(t *testing.T) {
			for _, c := range invalidCharacters {
				name := fmt.Sprintf("%2X", c)
				t.Run(name, func(t *testing.T) {
					data := []byte("A = " + st.Delimiter + string(c) + st.Delimiter)
					checkError(t, data)

					if st.CanEscape {
						t.Run("withEscapeBefore", func(t *testing.T) {
							data := []byte("A = " + st.Delimiter + "\\t" + string(c) + st.Delimiter)
							checkError(t, data)
						})
						t.Run("withEscapeAfter", func(t *testing.T) {
							data := []byte("A = " + st.Delimiter + string(c) + "\\t" + st.Delimiter)
							checkError(t, data)
						})
					}
				})
			}
		})
	}
}

//nolint:funlen
func TestLocalDateTime(t *testing.T) {
	examples := []struct {
		desc  string
		input string
		prec  int
	}{
		{
			desc:  "9 digits zero nanoseconds",
			input: "2006-01-02T15:04:05.000000000",
			prec:  9,
		},
		{
			desc:  "9 digits",
			input: "2006-01-02T15:04:05.123456789",
			prec:  9,
		},
		{
			desc:  "8 digits",
			input: "2006-01-02T15:04:05.12345678",
			prec:  8,
		},
		{
			desc:  "7 digits",
			input: "2006-01-02T15:04:05.1234567",
			prec:  7,
		},
		{
			desc:  "6 digits",
			input: "2006-01-02T15:04:05.123456",
			prec:  6,
		},
		{
			desc:  "5 digits",
			input: "2006-01-02T15:04:05.12345",
			prec:  5,
		},
		{
			desc:  "4 digits",
			input: "2006-01-02T15:04:05.1234",
			prec:  4,
		},
		{
			desc:  "3 digits",
			input: "2006-01-02T15:04:05.123",
			prec:  3,
		},
		{
			desc:  "2 digits",
			input: "2006-01-02T15:04:05.12",
			prec:  2,
		},
		{
			desc:  "1 digit",
			input: "2006-01-02T15:04:05.1",
			prec:  1,
		},
		{
			desc:  "0 digit",
			input: "2006-01-02T15:04:05",
		},
	}

	for _, e := range examples {
		e := e
		t.Run(e.desc, func(t *testing.T) {
			t.Log("input:", e.input)
			doc := `a = ` + e.input
			m := map[string]toml.LocalDateTime{}
			err := toml.Unmarshal([]byte(doc), &m)
			require.NoError(t, err)
			actual := m["a"]
			golang, err := time.Parse("2006-01-02T15:04:05.999999999", e.input)
			require.NoError(t, err)
			expected := toml.LocalDateTime{
				toml.LocalDate{golang.Year(), int(golang.Month()), golang.Day()},
				toml.LocalTime{golang.Hour(), golang.Minute(), golang.Second(), golang.Nanosecond(), e.prec},
			}
			require.Equal(t, expected, actual)
		})
	}
}

func TestUnmarshal_RecursiveTable(t *testing.T) {
	type Foo struct {
		I int
		F *Foo
	}

	examples := []struct {
		desc     string
		input    string
		expected string
		err      bool
	}{
		{
			desc: "simplest",
			input: `
				I=1
			`,
			expected: `{"I":1,"F":null}`,
		},
		{
			desc: "depth 1",
			input: `
				I=1
				[F]
				I=2
			`,
			expected: `{"I":1,"F":{"I":2,"F":null}}`,
		},
		{
			desc: "depth 3",
			input: `
				I=1
				[F]
				I=2
				[F.F]
				I=3
			`,
			expected: `{"I":1,"F":{"I":2,"F":{"I":3,"F":null}}}`,
		},
		{
			desc: "depth 4",
			input: `
				I=1
				[F]
				I=2
				[F.F]
				I=3
				[F.F.F]
				I=4
			`,
			expected: `{"I":1,"F":{"I":2,"F":{"I":3,"F":{"I":4,"F":null}}}}`,
		},
		{
			desc: "skip mid step",
			input: `
				I=1
				[F.F]
				I=7
			`,
			expected: `{"I":1,"F":{"I":0,"F":{"I":7,"F":null}}}`,
		},
	}

	for _, ex := range examples {
		e := ex
		t.Run(e.desc, func(t *testing.T) {
			foo := Foo{}
			err := toml.Unmarshal([]byte(e.input), &foo)
			if e.err {
				require.Error(t, err)
			} else {
				require.NoError(t, err)
				j, err := json.Marshal(foo)
				require.NoError(t, err)
				assert.Equal(t, e.expected, string(j))
			}
		})
	}
}

func TestUnmarshal_RecursiveTableArray(t *testing.T) {
	type Foo struct {
		I int
		F []*Foo
	}

	examples := []struct {
		desc     string
		input    string
		expected string
		err      bool
	}{
		{
			desc: "simplest",
			input: `
				I=1
				F=[]
			`,
			expected: `{"I":1,"F":[]}`,
		},
		{
			desc: "depth 1",
			input: `
				I=1
				[[F]]
				I=2
				F=[]
			`,
			expected: `{"I":1,"F":[{"I":2,"F":[]}]}`,
		},
		{
			desc: "depth 2",
			input: `
				I=1
				[[F]]
				I=2
				[[F.F]]
				I=3
				F=[]
			`,
			expected: `{"I":1,"F":[{"I":2,"F":[{"I":3,"F":[]}]}]}`,
		},
		{
			desc: "depth 3",
			input: `
				I=1
				[[F]]
				I=2
				[[F.F]]
				I=3
				[[F.F.F]]
				I=4
				F=[]
			`,
			expected: `{"I":1,"F":[{"I":2,"F":[{"I":3,"F":[{"I":4,"F":[]}]}]}]}`,
		},
		{
			desc: "depth 4",
			input: `
				I=1
				[[F]]
				I=2
				[[F.F]]
				I=3
				[[F.F.F]]
				I=4
				[[F.F.F.F]]
				I=5
				F=[]
			`,
			expected: `{"I":1,"F":[{"I":2,"F":[{"I":3,"F":[{"I":4,"F":[{"I":5,"F":[]}]}]}]}]}`,
		},
	}

	for _, ex := range examples {
		e := ex
		t.Run(e.desc, func(t *testing.T) {
			foo := Foo{}
			err := toml.Unmarshal([]byte(e.input), &foo)
			if e.err {
				require.Error(t, err)
			} else {
				require.NoError(t, err)
				j, err := json.Marshal(foo)
				require.NoError(t, err)
				assert.Equal(t, e.expected, string(j))
			}
		})
	}
}