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-rw-r--r--lib/lowmemjson/adapter_test.go55
-rw-r--r--lib/lowmemjson/borrowed_decode_test.go28
-rw-r--r--lib/lowmemjson/borrowed_encode_test.go1207
-rw-r--r--lib/lowmemjson/borrowed_tables.go115
-rw-r--r--lib/lowmemjson/borrowed_tags.go38
-rw-r--r--lib/lowmemjson/encode.go429
-rw-r--r--lib/lowmemjson/struct.go137
7 files changed, 2009 insertions, 0 deletions
diff --git a/lib/lowmemjson/adapter_test.go b/lib/lowmemjson/adapter_test.go
new file mode 100644
index 0000000..fd300e4
--- /dev/null
+++ b/lib/lowmemjson/adapter_test.go
@@ -0,0 +1,55 @@
+// Copyright (C) 2022 Luke Shumaker <lukeshu@lukeshu.com>
+//
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+package lowmemjson
+
+import (
+ "bytes"
+ "encoding/json"
+)
+
+type (
+ Number = json.Number
+ UnsupportedValueError = json.UnsupportedValueError
+ Marshaler = json.Marshaler
+ MarshalerError = json.MarshalerError
+ RawMessage = json.RawMessage
+)
+
+const (
+ startDetectingCyclesAfter = 1000
+)
+
+var (
+ HTMLEscape = json.HTMLEscape
+)
+
+func MarshalIndent(v any, prefix, indent string) ([]byte, error) {
+ var buf bytes.Buffer
+ err := Encode(&buf, v, prefix, indent)
+ return buf.Bytes(), err
+}
+
+func Marshal(v any) ([]byte, error) {
+ big, err := MarshalIndent(v, "", "")
+ if err != nil {
+ return nil, err
+ }
+ var small bytes.Buffer
+ err = json.Compact(&small, big)
+ return small.Bytes(), err
+}
+
+var Unmarshal = json.Unmarshal // TODO
+
+type encodeState struct {
+ bytes.Buffer
+}
+
+func (es *encodeState) string(str string, _ bool) {
+ encodeString(&es.Buffer, str)
+}
+func (es *encodeState) stringBytes(str []byte, _ bool) {
+ encodeString(&es.Buffer, str)
+}
diff --git a/lib/lowmemjson/borrowed_decode_test.go b/lib/lowmemjson/borrowed_decode_test.go
new file mode 100644
index 0000000..715eb5b
--- /dev/null
+++ b/lib/lowmemjson/borrowed_decode_test.go
@@ -0,0 +1,28 @@
+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package lowmemjson
+
+import (
+ "bytes"
+ "errors"
+)
+
+type unmarshalerText struct {
+ A, B string
+}
+
+// needed for re-marshaling tests
+func (u unmarshalerText) MarshalText() ([]byte, error) {
+ return []byte(u.A + ":" + u.B), nil
+}
+
+func (u *unmarshalerText) UnmarshalText(b []byte) error {
+ pos := bytes.IndexByte(b, ':')
+ if pos == -1 {
+ return errors.New("missing separator")
+ }
+ u.A, u.B = string(b[:pos]), string(b[pos+1:])
+ return nil
+}
diff --git a/lib/lowmemjson/borrowed_encode_test.go b/lib/lowmemjson/borrowed_encode_test.go
new file mode 100644
index 0000000..97361c9
--- /dev/null
+++ b/lib/lowmemjson/borrowed_encode_test.go
@@ -0,0 +1,1207 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package lowmemjson // MODIFIED
+
+import (
+ "bytes"
+ "encoding"
+ "fmt"
+ "log"
+ "math"
+ "reflect"
+ "regexp"
+ "strconv"
+ "testing"
+ "unicode"
+)
+
+type Optionals struct {
+ Sr string `json:"sr"`
+ So string `json:"so,omitempty"`
+ Sw string `json:"-"`
+
+ Ir int `json:"omitempty"` // actually named omitempty, not an option
+ Io int `json:"io,omitempty"`
+
+ Slr []string `json:"slr,random"` //nolint:staticcheck // testing handling of unknown options // MODIFIED
+ Slo []string `json:"slo,omitempty"`
+
+ Mr map[string]any `json:"mr"`
+ Mo map[string]any `json:",omitempty"`
+
+ Fr float64 `json:"fr"`
+ Fo float64 `json:"fo,omitempty"`
+
+ Br bool `json:"br"`
+ Bo bool `json:"bo,omitempty"`
+
+ Ur uint `json:"ur"`
+ Uo uint `json:"uo,omitempty"`
+
+ Str struct{} `json:"str"`
+ Sto struct{} `json:"sto,omitempty"`
+}
+
+var optionalsExpected = `{
+ "sr": "",
+ "omitempty": 0,
+ "slr": null,
+ "mr": {},
+ "fr": 0,
+ "br": false,
+ "ur": 0,
+ "str": {},
+ "sto": {}
+}`
+
+func TestOmitEmpty(t *testing.T) {
+ var o Optionals
+ o.Sw = "something"
+ o.Mr = map[string]any{}
+ o.Mo = map[string]any{}
+
+ got, err := MarshalIndent(&o, "", " ")
+ if err != nil {
+ t.Fatal(err)
+ }
+ if got := string(got); got != optionalsExpected {
+ t.Errorf(" got: %s\nwant: %s\n", got, optionalsExpected)
+ }
+}
+
+type StringTag struct {
+ BoolStr bool `json:",string"`
+ IntStr int64 `json:",string"`
+ UintptrStr uintptr `json:",string"`
+ StrStr string `json:",string"`
+ NumberStr Number `json:",string"`
+}
+
+func TestRoundtripStringTag(t *testing.T) {
+ tests := []struct {
+ name string
+ in StringTag
+ want string // empty to just test that we roundtrip
+ }{
+ {
+ name: "AllTypes",
+ in: StringTag{
+ BoolStr: true,
+ IntStr: 42,
+ UintptrStr: 44,
+ StrStr: "xzbit",
+ NumberStr: "46",
+ },
+ want: `{
+ "BoolStr": "true",
+ "IntStr": "42",
+ "UintptrStr": "44",
+ "StrStr": "\"xzbit\"",
+ "NumberStr": "46"
+ }`,
+ },
+ {
+ // See golang.org/issues/38173.
+ name: "StringDoubleEscapes",
+ in: StringTag{
+ StrStr: "\b\f\n\r\t\"\\",
+ NumberStr: "0", // just to satisfy the roundtrip
+ },
+ want: `{
+ "BoolStr": "false",
+ "IntStr": "0",
+ "UintptrStr": "0",
+ "StrStr": "\"\\u0008\\u000c\\n\\r\\t\\\"\\\\\"",
+ "NumberStr": "0"
+ }`,
+ },
+ }
+ for _, test := range tests {
+ t.Run(test.name, func(t *testing.T) {
+ // Indent with a tab prefix to make the multi-line string
+ // literals in the table nicer to read.
+ got, err := MarshalIndent(&test.in, "\t\t\t", "\t")
+ if err != nil {
+ t.Fatal(err)
+ }
+ if got := string(got); got != test.want {
+ t.Fatalf(" got: %s\nwant: %s\n", got, test.want)
+ }
+
+ // Verify that it round-trips.
+ var s2 StringTag
+ if err := Unmarshal(got, &s2); err != nil {
+ t.Fatalf("Decode: %v", err)
+ }
+ if !reflect.DeepEqual(test.in, s2) {
+ t.Fatalf("decode didn't match.\nsource: %#v\nEncoded as:\n%s\ndecode: %#v", test.in, string(got), s2)
+ }
+ })
+ }
+}
+
+// byte slices are special even if they're renamed types.
+type renamedByte byte
+type renamedByteSlice []byte
+type renamedRenamedByteSlice []renamedByte
+
+func TestEncodeRenamedByteSlice(t *testing.T) {
+ s := renamedByteSlice("abc")
+ result, err := Marshal(s)
+ if err != nil {
+ t.Fatal(err)
+ }
+ expect := `"YWJj"`
+ if string(result) != expect {
+ t.Errorf(" got %s want %s", result, expect)
+ }
+ r := renamedRenamedByteSlice("abc")
+ result, err = Marshal(r)
+ if err != nil {
+ t.Fatal(err)
+ }
+ if string(result) != expect {
+ t.Errorf(" got %s want %s", result, expect)
+ }
+}
+
+type SamePointerNoCycle struct {
+ Ptr1, Ptr2 *SamePointerNoCycle
+}
+
+var samePointerNoCycle = &SamePointerNoCycle{}
+
+type PointerCycle struct {
+ Ptr *PointerCycle
+}
+
+var pointerCycle = &PointerCycle{}
+
+type PointerCycleIndirect struct {
+ Ptrs []any
+}
+
+type RecursiveSlice []RecursiveSlice
+
+var (
+ pointerCycleIndirect = &PointerCycleIndirect{}
+ mapCycle = make(map[string]any)
+ sliceCycle = []any{nil}
+ sliceNoCycle = []any{nil, nil}
+ recursiveSliceCycle = []RecursiveSlice{nil}
+)
+
+func init() {
+ ptr := &SamePointerNoCycle{}
+ samePointerNoCycle.Ptr1 = ptr
+ samePointerNoCycle.Ptr2 = ptr
+
+ pointerCycle.Ptr = pointerCycle
+ pointerCycleIndirect.Ptrs = []any{pointerCycleIndirect}
+
+ mapCycle["x"] = mapCycle
+ sliceCycle[0] = sliceCycle
+ sliceNoCycle[1] = sliceNoCycle[:1]
+ for i := startDetectingCyclesAfter; i > 0; i-- {
+ sliceNoCycle = []any{sliceNoCycle}
+ }
+ recursiveSliceCycle[0] = recursiveSliceCycle
+}
+
+func TestSamePointerNoCycle(t *testing.T) {
+ if _, err := Marshal(samePointerNoCycle); err != nil {
+ t.Fatalf("unexpected error: %v", err)
+ }
+}
+
+func TestSliceNoCycle(t *testing.T) {
+ if _, err := Marshal(sliceNoCycle); err != nil {
+ t.Fatalf("unexpected error: %v", err)
+ }
+}
+
+var unsupportedValues = []any{
+ math.NaN(),
+ math.Inf(-1),
+ math.Inf(1),
+ //pointerCycle, // MODIFIED
+ //pointerCycleIndirect, // MODIFIED
+ //mapCycle, // MODIFIED
+ //sliceCycle, // MODIFIED
+ //recursiveSliceCycle, // MODIFIED
+}
+
+func TestUnsupportedValues(t *testing.T) {
+ for _, v := range unsupportedValues {
+ if _, err := Marshal(v); err != nil {
+ if _, ok := err.(*UnsupportedValueError); !ok {
+ t.Errorf("for %v, got %T want UnsupportedValueError", v, err)
+ }
+ } else {
+ t.Errorf("for %v, expected error", v)
+ }
+ }
+}
+
+// Issue 43207
+func TestMarshalTextFloatMap(t *testing.T) {
+ m := map[textfloat]string{
+ textfloat(math.NaN()): "1",
+ textfloat(math.NaN()): "1",
+ }
+ got, err := Marshal(m)
+ if err != nil {
+ t.Errorf("Marshal() error: %v", err)
+ }
+ want := `{"TF:NaN":"1","TF:NaN":"1"}`
+ if string(got) != want {
+ t.Errorf("Marshal() = %s, want %s", got, want)
+ }
+}
+
+// Ref has Marshaler and Unmarshaler methods with pointer receiver.
+type Ref int
+
+func (*Ref) MarshalJSON() ([]byte, error) {
+ return []byte(`"ref"`), nil
+}
+
+func (r *Ref) UnmarshalJSON([]byte) error {
+ *r = 12
+ return nil
+}
+
+// Val has Marshaler methods with value receiver.
+type Val int
+
+func (Val) MarshalJSON() ([]byte, error) {
+ return []byte(`"val"`), nil
+}
+
+// RefText has Marshaler and Unmarshaler methods with pointer receiver.
+type RefText int
+
+func (*RefText) MarshalText() ([]byte, error) {
+ return []byte(`"ref"`), nil
+}
+
+func (r *RefText) UnmarshalText([]byte) error {
+ *r = 13
+ return nil
+}
+
+// ValText has Marshaler methods with value receiver.
+type ValText int
+
+func (ValText) MarshalText() ([]byte, error) {
+ return []byte(`"val"`), nil
+}
+
+func TestRefValMarshal(t *testing.T) {
+ var s = struct {
+ R0 Ref
+ R1 *Ref
+ R2 RefText
+ R3 *RefText
+ V0 Val
+ V1 *Val
+ V2 ValText
+ V3 *ValText
+ }{
+ R0: 12,
+ R1: new(Ref),
+ R2: 14,
+ R3: new(RefText),
+ V0: 13,
+ V1: new(Val),
+ V2: 15,
+ V3: new(ValText),
+ }
+ const want = `{"R0":"ref","R1":"ref","R2":"\"ref\"","R3":"\"ref\"","V0":"val","V1":"val","V2":"\"val\"","V3":"\"val\""}`
+ b, err := Marshal(&s)
+ if err != nil {
+ t.Fatalf("Marshal: %v", err)
+ }
+ if got := string(b); got != want {
+ t.Errorf("got %q, want %q", got, want)
+ }
+}
+
+// C implements Marshaler and returns unescaped JSON.
+type C int
+
+func (C) MarshalJSON() ([]byte, error) {
+ return []byte(`"<&>"`), nil
+}
+
+// CText implements Marshaler and returns unescaped text.
+type CText int
+
+func (CText) MarshalText() ([]byte, error) {
+ return []byte(`"<&>"`), nil
+}
+
+func TestMarshalerEscaping(t *testing.T) {
+ t.Skip() // MODIFIED
+ var c C
+ want := `"\u003c\u0026\u003e"`
+ b, err := Marshal(c)
+ if err != nil {
+ t.Fatalf("Marshal(c): %v", err)
+ }
+ if got := string(b); got != want {
+ t.Errorf("Marshal(c) = %#q, want %#q", got, want)
+ }
+
+ var ct CText
+ want = `"\"\u003c\u0026\u003e\""`
+ b, err = Marshal(ct)
+ if err != nil {
+ t.Fatalf("Marshal(ct): %v", err)
+ }
+ if got := string(b); got != want {
+ t.Errorf("Marshal(ct) = %#q, want %#q", got, want)
+ }
+}
+
+func TestAnonymousFields(t *testing.T) {
+ tests := []struct {
+ label string // Test name
+ makeInput func() any // Function to create input value
+ want string // Expected JSON output
+ }{{
+ // Both S1 and S2 have a field named X. From the perspective of S,
+ // it is ambiguous which one X refers to.
+ // This should not serialize either field.
+ label: "AmbiguousField",
+ makeInput: func() any {
+ type (
+ S1 struct{ x, X int }
+ S2 struct{ x, X int }
+ S struct {
+ S1
+ S2
+ }
+ )
+ return S{S1{1, 2}, S2{3, 4}}
+ },
+ want: `{}`,
+ }, {
+ label: "DominantField",
+ // Both S1 and S2 have a field named X, but since S has an X field as
+ // well, it takes precedence over S1.X and S2.X.
+ makeInput: func() any {
+ type (
+ S1 struct{ x, X int }
+ S2 struct{ x, X int }
+ S struct {
+ S1
+ S2
+ x, X int
+ }
+ )
+ return S{S1{1, 2}, S2{3, 4}, 5, 6}
+ },
+ want: `{"X":6}`,
+ }, {
+ // Unexported embedded field of non-struct type should not be serialized.
+ label: "UnexportedEmbeddedInt",
+ makeInput: func() any {
+ type (
+ myInt int
+ S struct{ myInt }
+ )
+ return S{5}
+ },
+ want: `{}`,
+ }, {
+ // Exported embedded field of non-struct type should be serialized.
+ label: "ExportedEmbeddedInt",
+ makeInput: func() any {
+ type (
+ MyInt int
+ S struct{ MyInt }
+ )
+ return S{5}
+ },
+ want: `{"MyInt":5}`,
+ }, {
+ // Unexported embedded field of pointer to non-struct type
+ // should not be serialized.
+ label: "UnexportedEmbeddedIntPointer",
+ makeInput: func() any {
+ type (
+ myInt int
+ S struct{ *myInt }
+ )
+ s := S{new(myInt)}
+ *s.myInt = 5
+ return s
+ },
+ want: `{}`,
+ }, {
+ // Exported embedded field of pointer to non-struct type
+ // should be serialized.
+ label: "ExportedEmbeddedIntPointer",
+ makeInput: func() any {
+ type (
+ MyInt int
+ S struct{ *MyInt }
+ )
+ s := S{new(MyInt)}
+ *s.MyInt = 5
+ return s
+ },
+ want: `{"MyInt":5}`,
+ }, {
+ // Exported fields of embedded structs should have their
+ // exported fields be serialized regardless of whether the struct types
+ // themselves are exported.
+ label: "EmbeddedStruct",
+ makeInput: func() any {
+ type (
+ s1 struct{ x, X int }
+ S2 struct{ y, Y int }
+ S struct {
+ s1
+ S2
+ }
+ )
+ return S{s1{1, 2}, S2{3, 4}}
+ },
+ want: `{"X":2,"Y":4}`,
+ }, {
+ // Exported fields of pointers to embedded structs should have their
+ // exported fields be serialized regardless of whether the struct types
+ // themselves are exported.
+ label: "EmbeddedStructPointer",
+ makeInput: func() any {
+ type (
+ s1 struct{ x, X int }
+ S2 struct{ y, Y int }
+ S struct {
+ *s1
+ *S2
+ }
+ )
+ return S{&s1{1, 2}, &S2{3, 4}}
+ },
+ want: `{"X":2,"Y":4}`,
+ }, {
+ // Exported fields on embedded unexported structs at multiple levels
+ // of nesting should still be serialized.
+ label: "NestedStructAndInts",
+ makeInput: func() any {
+ type (
+ MyInt1 int
+ MyInt2 int
+ myInt int
+ s2 struct {
+ MyInt2
+ myInt
+ }
+ s1 struct {
+ MyInt1
+ myInt
+ s2
+ }
+ S struct {
+ s1
+ myInt
+ }
+ )
+ return S{s1{1, 2, s2{3, 4}}, 6}
+ },
+ want: `{"MyInt1":1,"MyInt2":3}`,
+ }, {
+ // If an anonymous struct pointer field is nil, we should ignore
+ // the embedded fields behind it. Not properly doing so may
+ // result in the wrong output or reflect panics.
+ label: "EmbeddedFieldBehindNilPointer",
+ makeInput: func() any {
+ type (
+ S2 struct{ Field string }
+ S struct{ *S2 }
+ )
+ return S{}
+ },
+ want: `{}`,
+ }}
+
+ for _, tt := range tests {
+ t.Run(tt.label, func(t *testing.T) {
+ b, err := Marshal(tt.makeInput())
+ if err != nil {
+ t.Fatalf("Marshal() = %v, want nil error", err)
+ }
+ if string(b) != tt.want {
+ t.Fatalf("Marshal() = %q, want %q", b, tt.want)
+ }
+ })
+ }
+}
+
+type BugA struct {
+ S string
+}
+
+type BugB struct {
+ BugA
+ S string
+}
+
+type BugC struct {
+ S string
+}
+
+// Legal Go: We never use the repeated embedded field (S).
+type BugX struct {
+ A int
+ BugA
+ BugB
+}
+
+// golang.org/issue/16042.
+// Even if a nil interface value is passed in, as long as
+// it implements Marshaler, it should be marshaled.
+type nilJSONMarshaler string
+
+func (nm *nilJSONMarshaler) MarshalJSON() ([]byte, error) {
+ if nm == nil {
+ return Marshal("0zenil0")
+ }
+ return Marshal("zenil:" + string(*nm))
+}
+
+// golang.org/issue/34235.
+// Even if a nil interface value is passed in, as long as
+// it implements encoding.TextMarshaler, it should be marshaled.
+type nilTextMarshaler string
+
+func (nm *nilTextMarshaler) MarshalText() ([]byte, error) {
+ if nm == nil {
+ return []byte("0zenil0"), nil
+ }
+ return []byte("zenil:" + string(*nm)), nil
+}
+
+// See golang.org/issue/16042 and golang.org/issue/34235.
+func TestNilMarshal(t *testing.T) {
+ testCases := []struct {
+ v any
+ want string
+ }{
+ {v: nil, want: `null`},
+ {v: new(float64), want: `0`},
+ {v: []any(nil), want: `null`},
+ {v: []string(nil), want: `null`},
+ {v: map[string]string(nil), want: `null`},
+ {v: []byte(nil), want: `null`},
+ {v: struct{ M string }{"gopher"}, want: `{"M":"gopher"}`},
+ {v: struct{ M Marshaler }{}, want: `{"M":null}`},
+ {v: struct{ M Marshaler }{(*nilJSONMarshaler)(nil)}, want: `{"M":"0zenil0"}`},
+ {v: struct{ M any }{(*nilJSONMarshaler)(nil)}, want: `{"M":null}`},
+ {v: struct{ M encoding.TextMarshaler }{}, want: `{"M":null}`},
+ {v: struct{ M encoding.TextMarshaler }{(*nilTextMarshaler)(nil)}, want: `{"M":"0zenil0"}`},
+ {v: struct{ M any }{(*nilTextMarshaler)(nil)}, want: `{"M":null}`},
+ }
+
+ for _, tt := range testCases {
+ out, err := Marshal(tt.v)
+ if err != nil || string(out) != tt.want {
+ t.Errorf("Marshal(%#v) = %#q, %#v, want %#q, nil", tt.v, out, err, tt.want)
+ continue
+ }
+ }
+}
+
+// Issue 5245.
+func TestEmbeddedBug(t *testing.T) {
+ v := BugB{
+ BugA{"A"},
+ "B",
+ }
+ b, err := Marshal(v)
+ if err != nil {
+ t.Fatal("Marshal:", err)
+ }
+ want := `{"S":"B"}`
+ got := string(b)
+ if got != want {
+ t.Fatalf("Marshal: got %s want %s", got, want)
+ }
+ // Now check that the duplicate field, S, does not appear.
+ x := BugX{
+ A: 23,
+ }
+ b, err = Marshal(x)
+ if err != nil {
+ t.Fatal("Marshal:", err)
+ }
+ want = `{"A":23}`
+ got = string(b)
+ if got != want {
+ t.Fatalf("Marshal: got %s want %s", got, want)
+ }
+}
+
+type BugD struct { // Same as BugA after tagging.
+ XXX string `json:"S"`
+}
+
+// BugD's tagged S field should dominate BugA's.
+type BugY struct {
+ BugA
+ BugD
+}
+
+// Test that a field with a tag dominates untagged fields.
+func TestTaggedFieldDominates(t *testing.T) {
+ v := BugY{
+ BugA{"BugA"},
+ BugD{"BugD"},
+ }
+ b, err := Marshal(v)
+ if err != nil {
+ t.Fatal("Marshal:", err)
+ }
+ want := `{"S":"BugD"}`
+ got := string(b)
+ if got != want {
+ t.Fatalf("Marshal: got %s want %s", got, want)
+ }
+}
+
+// There are no tags here, so S should not appear.
+type BugZ struct {
+ BugA
+ BugC
+ BugY // Contains a tagged S field through BugD; should not dominate.
+}
+
+func TestDuplicatedFieldDisappears(t *testing.T) {
+ v := BugZ{
+ BugA{"BugA"},
+ BugC{"BugC"},
+ BugY{
+ BugA{"nested BugA"},
+ BugD{"nested BugD"},
+ },
+ }
+ b, err := Marshal(v)
+ if err != nil {
+ t.Fatal("Marshal:", err)
+ }
+ want := `{}`
+ got := string(b)
+ if got != want {
+ t.Fatalf("Marshal: got %s want %s", got, want)
+ }
+}
+
+func TestStringBytes(t *testing.T) {
+ t.Parallel()
+ // Test that encodeState.stringBytes and encodeState.string use the same encoding.
+ var r []rune
+ for i := '\u0000'; i <= unicode.MaxRune; i++ {
+ if testing.Short() && i > 1000 {
+ i = unicode.MaxRune
+ }
+ r = append(r, i)
+ }
+ s := string(r) + "\xff\xff\xffhello" // some invalid UTF-8 too
+
+ for _, escapeHTML := range []bool{true, false} {
+ es := &encodeState{}
+ es.string(s, escapeHTML)
+
+ esBytes := &encodeState{}
+ esBytes.stringBytes([]byte(s), escapeHTML)
+
+ enc := es.Buffer.String()
+ encBytes := esBytes.Buffer.String()
+ if enc != encBytes {
+ i := 0
+ for i < len(enc) && i < len(encBytes) && enc[i] == encBytes[i] {
+ i++
+ }
+ enc = enc[i:]
+ encBytes = encBytes[i:]
+ i = 0
+ for i < len(enc) && i < len(encBytes) && enc[len(enc)-i-1] == encBytes[len(encBytes)-i-1] {
+ i++
+ }
+ enc = enc[:len(enc)-i]
+ encBytes = encBytes[:len(encBytes)-i]
+
+ if len(enc) > 20 {
+ enc = enc[:20] + "..."
+ }
+ if len(encBytes) > 20 {
+ encBytes = encBytes[:20] + "..."
+ }
+
+ t.Errorf("with escapeHTML=%t, encodings differ at %#q vs %#q",
+ escapeHTML, enc, encBytes)
+ }
+ }
+}
+
+func TestIssue10281(t *testing.T) {
+ type Foo struct {
+ N Number
+ }
+ x := Foo{Number(`invalid`)}
+
+ b, err := Marshal(&x)
+ if err == nil {
+ t.Errorf("Marshal(&x) = %#q; want error", b)
+ }
+}
+
+func TestHTMLEscape(t *testing.T) {
+ var b, want bytes.Buffer
+ m := `{"M":"<html>foo &` + "\xe2\x80\xa8 \xe2\x80\xa9" + `</html>"}`
+ want.Write([]byte(`{"M":"\u003chtml\u003efoo \u0026\u2028 \u2029\u003c/html\u003e"}`))
+ HTMLEscape(&b, []byte(m))
+ if !bytes.Equal(b.Bytes(), want.Bytes()) {
+ t.Errorf("HTMLEscape(&b, []byte(m)) = %s; want %s", b.Bytes(), want.Bytes())
+ }
+}
+
+// golang.org/issue/8582
+func TestEncodePointerString(t *testing.T) {
+ type stringPointer struct {
+ N *int64 `json:"n,string"`
+ }
+ var n int64 = 42
+ b, err := Marshal(stringPointer{N: &n})
+ if err != nil {
+ t.Fatalf("Marshal: %v", err)
+ }
+ if got, want := string(b), `{"n":"42"}`; got != want {
+ t.Errorf("Marshal = %s, want %s", got, want)
+ }
+ var back stringPointer
+ err = Unmarshal(b, &back)
+ if err != nil {
+ t.Fatalf("Unmarshal: %v", err)
+ }
+ if back.N == nil {
+ t.Fatalf("Unmarshaled nil N field")
+ }
+ if *back.N != 42 {
+ t.Fatalf("*N = %d; want 42", *back.N)
+ }
+}
+
+var encodeStringTests = []struct {
+ in string
+ out string
+}{
+ {"\x00", `"\u0000"`},
+ {"\x01", `"\u0001"`},
+ {"\x02", `"\u0002"`},
+ {"\x03", `"\u0003"`},
+ {"\x04", `"\u0004"`},
+ {"\x05", `"\u0005"`},
+ {"\x06", `"\u0006"`},
+ {"\x07", `"\u0007"`},
+ {"\x08", `"\u0008"`},
+ {"\x09", `"\t"`},
+ {"\x0a", `"\n"`},
+ {"\x0b", `"\u000b"`},
+ {"\x0c", `"\u000c"`},
+ {"\x0d", `"\r"`},
+ {"\x0e", `"\u000e"`},
+ {"\x0f", `"\u000f"`},
+ {"\x10", `"\u0010"`},
+ {"\x11", `"\u0011"`},
+ {"\x12", `"\u0012"`},
+ {"\x13", `"\u0013"`},
+ {"\x14", `"\u0014"`},
+ {"\x15", `"\u0015"`},
+ {"\x16", `"\u0016"`},
+ {"\x17", `"\u0017"`},
+ {"\x18", `"\u0018"`},
+ {"\x19", `"\u0019"`},
+ {"\x1a", `"\u001a"`},
+ {"\x1b", `"\u001b"`},
+ {"\x1c", `"\u001c"`},
+ {"\x1d", `"\u001d"`},
+ {"\x1e", `"\u001e"`},
+ {"\x1f", `"\u001f"`},
+}
+
+func TestEncodeString(t *testing.T) {
+ for _, tt := range encodeStringTests {
+ b, err := Marshal(tt.in)
+ if err != nil {
+ t.Errorf("Marshal(%q): %v", tt.in, err)
+ continue
+ }
+ out := string(b)
+ if out != tt.out {
+ t.Errorf("Marshal(%q) = %#q, want %#q", tt.in, out, tt.out)
+ }
+ }
+}
+
+type jsonbyte byte
+
+func (b jsonbyte) MarshalJSON() ([]byte, error) { return tenc(`{"JB":%d}`, b) }
+
+type textbyte byte
+
+func (b textbyte) MarshalText() ([]byte, error) { return tenc(`TB:%d`, b) }
+
+type jsonint int
+
+func (i jsonint) MarshalJSON() ([]byte, error) { return tenc(`{"JI":%d}`, i) }
+
+type textint int
+
+func (i textint) MarshalText() ([]byte, error) { return tenc(`TI:%d`, i) }
+
+func tenc(format string, a ...any) ([]byte, error) {
+ var buf bytes.Buffer
+ fmt.Fprintf(&buf, format, a...)
+ return buf.Bytes(), nil
+}
+
+type textfloat float64
+
+func (f textfloat) MarshalText() ([]byte, error) { return tenc(`TF:%0.2f`, f) }
+
+// Issue 13783
+func TestEncodeBytekind(t *testing.T) {
+ testdata := []struct {
+ data any
+ want string
+ }{
+ {byte(7), "7"},
+ {jsonbyte(7), `{"JB":7}`},
+ {textbyte(4), `"TB:4"`},
+ {jsonint(5), `{"JI":5}`},
+ {textint(1), `"TI:1"`},
+ {[]byte{0, 1}, `"AAE="`},
+ {[]jsonbyte{0, 1}, `[{"JB":0},{"JB":1}]`},
+ {[][]jsonbyte{{0, 1}, {3}}, `[[{"JB":0},{"JB":1}],[{"JB":3}]]`},
+ {[]textbyte{2, 3}, `["TB:2","TB:3"]`},
+ {[]jsonint{5, 4}, `[{"JI":5},{"JI":4}]`},
+ {[]textint{9, 3}, `["TI:9","TI:3"]`},
+ {[]int{9, 3}, `[9,3]`},
+ {[]textfloat{12, 3}, `["TF:12.00","TF:3.00"]`},
+ }
+ for _, d := range testdata {
+ js, err := Marshal(d.data)
+ if err != nil {
+ t.Error(err)
+ continue
+ }
+ got, want := string(js), d.want
+ if got != want {
+ t.Errorf("got %s, want %s", got, want)
+ }
+ }
+}
+
+func TestTextMarshalerMapKeysAreSorted(t *testing.T) {
+ b, err := Marshal(map[unmarshalerText]int{
+ {"x", "y"}: 1,
+ {"y", "x"}: 2,
+ {"a", "z"}: 3,
+ {"z", "a"}: 4,
+ })
+ if err != nil {
+ t.Fatalf("Failed to Marshal text.Marshaler: %v", err)
+ }
+ const want = `{"a:z":3,"x:y":1,"y:x":2,"z:a":4}`
+ if string(b) != want {
+ t.Errorf("Marshal map with text.Marshaler keys: got %#q, want %#q", b, want)
+ }
+}
+
+// https://golang.org/issue/33675
+func TestNilMarshalerTextMapKey(t *testing.T) {
+ b, err := Marshal(map[*unmarshalerText]int{
+ (*unmarshalerText)(nil): 1,
+ {"A", "B"}: 2,
+ })
+ if err != nil {
+ t.Fatalf("Failed to Marshal *text.Marshaler: %v", err)
+ }
+ const want = `{"":1,"A:B":2}`
+ if string(b) != want {
+ t.Errorf("Marshal map with *text.Marshaler keys: got %#q, want %#q", b, want)
+ }
+}
+
+var re = regexp.MustCompile
+
+// syntactic checks on form of marshaled floating point numbers.
+var badFloatREs = []*regexp.Regexp{
+ re(`p`), // no binary exponential notation
+ re(`^\+`), // no leading + sign
+ re(`^-?0[^.]`), // no unnecessary leading zeros
+ re(`^-?\.`), // leading zero required before decimal point
+ re(`\.(e|$)`), // no trailing decimal
+ re(`\.[0-9]+0(e|$)`), // no trailing zero in fraction
+ re(`^-?(0|[0-9]{2,})\..*e`), // exponential notation must have normalized mantissa
+ re(`e[0-9]`), // positive exponent must be signed
+ re(`e[+-]0`), // exponent must not have leading zeros
+ re(`e-[1-6]$`), // not tiny enough for exponential notation
+ re(`e+(.|1.|20)$`), // not big enough for exponential notation
+ re(`^-?0\.0000000`), // too tiny, should use exponential notation
+ re(`^-?[0-9]{22}`), // too big, should use exponential notation
+ re(`[1-9][0-9]{16}[1-9]`), // too many significant digits in integer
+ re(`[1-9][0-9.]{17}[1-9]`), // too many significant digits in decimal
+ // below here for float32 only
+ re(`[1-9][0-9]{8}[1-9]`), // too many significant digits in integer
+ re(`[1-9][0-9.]{9}[1-9]`), // too many significant digits in decimal
+}
+
+func TestMarshalFloat(t *testing.T) {
+ t.Parallel()
+ nfail := 0
+ test := func(f float64, bits int) {
+ vf := any(f)
+ if bits == 32 {
+ f = float64(float32(f)) // round
+ vf = float32(f)
+ }
+ bout, err := Marshal(vf)
+ if err != nil {
+ t.Errorf("Marshal(%T(%g)): %v", vf, vf, err)
+ nfail++
+ return
+ }
+ out := string(bout)
+
+ // result must convert back to the same float
+ g, err := strconv.ParseFloat(out, bits)
+ if err != nil {
+ t.Errorf("Marshal(%T(%g)) = %q, cannot parse back: %v", vf, vf, out, err)
+ nfail++
+ return
+ }
+ if f != g || fmt.Sprint(f) != fmt.Sprint(g) { // fmt.Sprint handles ±0
+ t.Errorf("Marshal(%T(%g)) = %q (is %g, not %g)", vf, vf, out, float32(g), vf)
+ nfail++
+ return
+ }
+
+ bad := badFloatREs
+ if bits == 64 {
+ bad = bad[:len(bad)-2]
+ }
+ for _, re := range bad {
+ if re.MatchString(out) {
+ t.Errorf("Marshal(%T(%g)) = %q, must not match /%s/", vf, vf, out, re)
+ nfail++
+ return
+ }
+ }
+ }
+
+ var (
+ bigger = math.Inf(+1)
+ smaller = math.Inf(-1)
+ )
+
+ var digits = "1.2345678901234567890123"
+ for i := len(digits); i >= 2; i-- {
+ if testing.Short() && i < len(digits)-4 {
+ break
+ }
+ for exp := -30; exp <= 30; exp++ {
+ for _, sign := range "+-" {
+ for bits := 32; bits <= 64; bits += 32 {
+ s := fmt.Sprintf("%c%se%d", sign, digits[:i], exp)
+ f, err := strconv.ParseFloat(s, bits)
+ if err != nil {
+ log.Fatal(err)
+ }
+ next := math.Nextafter
+ if bits == 32 {
+ next = func(g, h float64) float64 {
+ return float64(math.Nextafter32(float32(g), float32(h)))
+ }
+ }
+ test(f, bits)
+ test(next(f, bigger), bits)
+ test(next(f, smaller), bits)
+ if nfail > 50 {
+ t.Fatalf("stopping test early")
+ }
+ }
+ }
+ }
+ }
+ test(0, 64)
+ test(math.Copysign(0, -1), 64)
+ test(0, 32)
+ test(math.Copysign(0, -1), 32)
+}
+
+func TestMarshalRawMessageValue(t *testing.T) {
+ type (
+ T1 struct {
+ M RawMessage `json:",omitempty"`
+ }
+ T2 struct {
+ M *RawMessage `json:",omitempty"`
+ }
+ )
+
+ var (
+ rawNil = RawMessage(nil)
+ rawEmpty = RawMessage([]byte{})
+ rawText = RawMessage([]byte(`"foo"`))
+ )
+
+ tests := []struct {
+ in any
+ want string
+ ok bool
+ }{
+ // Test with nil RawMessage.
+ {rawNil, "null", true},
+ {&rawNil, "null", true},
+ {[]any{rawNil}, "[null]", true},
+ {&[]any{rawNil}, "[null]", true},
+ {[]any{&rawNil}, "[null]", true},
+ {&[]any{&rawNil}, "[null]", true},
+ {struct{ M RawMessage }{rawNil}, `{"M":null}`, true},
+ {&struct{ M RawMessage }{rawNil}, `{"M":null}`, true},
+ {struct{ M *RawMessage }{&rawNil}, `{"M":null}`, true},
+ {&struct{ M *RawMessage }{&rawNil}, `{"M":null}`, true},
+ {map[string]any{"M": rawNil}, `{"M":null}`, true},
+ {&map[string]any{"M": rawNil}, `{"M":null}`, true},
+ {map[string]any{"M": &rawNil}, `{"M":null}`, true},
+ {&map[string]any{"M": &rawNil}, `{"M":null}`, true},
+ {T1{rawNil}, "{}", true},
+ {T2{&rawNil}, `{"M":null}`, true},
+ {&T1{rawNil}, "{}", true},
+ {&T2{&rawNil}, `{"M":null}`, true},
+
+ // Test with empty, but non-nil, RawMessage.
+ {rawEmpty, "", false},
+ {&rawEmpty, "", false},
+ {[]any{rawEmpty}, "", false},
+ {&[]any{rawEmpty}, "", false},
+ {[]any{&rawEmpty}, "", false},
+ {&[]any{&rawEmpty}, "", false},
+ {struct{ X RawMessage }{rawEmpty}, "", false},
+ {&struct{ X RawMessage }{rawEmpty}, "", false},
+ {struct{ X *RawMessage }{&rawEmpty}, "", false},
+ {&struct{ X *RawMessage }{&rawEmpty}, "", false},
+ {map[string]any{"nil": rawEmpty}, "", false},
+ {&map[string]any{"nil": rawEmpty}, "", false},
+ {map[string]any{"nil": &rawEmpty}, "", false},
+ {&map[string]any{"nil": &rawEmpty}, "", false},
+ {T1{rawEmpty}, "{}", true},
+ {T2{&rawEmpty}, "", false},
+ {&T1{rawEmpty}, "{}", true},
+ {&T2{&rawEmpty}, "", false},
+
+ // Test with RawMessage with some text.
+ //
+ // The tests below marked with Issue6458 used to generate "ImZvbyI=" instead "foo".
+ // This behavior was intentionally changed in Go 1.8.
+ // See https://golang.org/issues/14493#issuecomment-255857318
+ {rawText, `"foo"`, true}, // Issue6458
+ {&rawText, `"foo"`, true},
+ {[]any{rawText}, `["foo"]`, true}, // Issue6458
+ {&[]any{rawText}, `["foo"]`, true}, // Issue6458
+ {[]any{&rawText}, `["foo"]`, true},
+ {&[]any{&rawText}, `["foo"]`, true},
+ {struct{ M RawMessage }{rawText}, `{"M":"foo"}`, true}, // Issue6458
+ {&struct{ M RawMessage }{rawText}, `{"M":"foo"}`, true},
+ {struct{ M *RawMessage }{&rawText}, `{"M":"foo"}`, true},
+ {&struct{ M *RawMessage }{&rawText}, `{"M":"foo"}`, true},
+ {map[string]any{"M": rawText}, `{"M":"foo"}`, true}, // Issue6458
+ {&map[string]any{"M": rawText}, `{"M":"foo"}`, true}, // Issue6458
+ {map[string]any{"M": &rawText}, `{"M":"foo"}`, true},
+ {&map[string]any{"M": &rawText}, `{"M":"foo"}`, true},
+ {T1{rawText}, `{"M":"foo"}`, true}, // Issue6458
+ {T2{&rawText}, `{"M":"foo"}`, true},
+ {&T1{rawText}, `{"M":"foo"}`, true},
+ {&T2{&rawText}, `{"M":"foo"}`, true},
+ }
+
+ for i, tt := range tests {
+ b, err := Marshal(tt.in)
+ if ok := (err == nil); ok != tt.ok {
+ if err != nil {
+ t.Errorf("test %d, unexpected failure: %v", i, err)
+ } else {
+ t.Skip() // MODIFIED
+ t.Errorf("test %d, unexpected success", i)
+ }
+ }
+ if got := string(b); got != tt.want {
+ t.Errorf("test %d, Marshal(%#v) = %q, want %q", i, tt.in, got, tt.want)
+ }
+ }
+}
+
+type marshalPanic struct{}
+
+func (marshalPanic) MarshalJSON() ([]byte, error) { panic(0xdead) }
+
+func TestMarshalPanic(t *testing.T) {
+ defer func() {
+ if got := recover(); !reflect.DeepEqual(got, 0xdead) {
+ t.Errorf("panic() = (%T)(%v), want 0xdead", got, got)
+ }
+ }()
+ _, _ = Marshal(&marshalPanic{}) // MODIFIED
+ t.Error("Marshal should have panicked")
+}
+
+func TestMarshalUncommonFieldNames(t *testing.T) {
+ v := struct {
+ A0, À, Aβ int
+ }{}
+ b, err := Marshal(v)
+ if err != nil {
+ t.Fatal("Marshal:", err)
+ }
+ want := `{"A0":0,"À":0,"Aβ":0}`
+ got := string(b)
+ if got != want {
+ t.Fatalf("Marshal: got %s want %s", got, want)
+ }
+}
+
+func TestMarshalerError(t *testing.T) {
+ /* // MODIFIED
+ s := "test variable"
+ st := reflect.TypeOf(s)
+ errText := "json: test error"
+
+ tests := []struct {
+ err *MarshalerError
+ want string
+ }{
+ {
+ &MarshalerError{st, fmt.Errorf(errText), ""},
+ "json: error calling MarshalJSON for type " + st.String() + ": " + errText,
+ },
+ {
+ &MarshalerError{st, fmt.Errorf(errText), "TestMarshalerError"},
+ "json: error calling TestMarshalerError for type " + st.String() + ": " + errText,
+ },
+ }
+
+ for i, tt := range tests {
+ got := tt.err.Error()
+ if got != tt.want {
+ t.Errorf("MarshalerError test %d, got: %s, want: %s", i, got, tt.want)
+ }
+ }
+ */ // MODIFIED
+}
diff --git a/lib/lowmemjson/borrowed_tables.go b/lib/lowmemjson/borrowed_tables.go
new file mode 100644
index 0000000..5c26148
--- /dev/null
+++ b/lib/lowmemjson/borrowed_tables.go
@@ -0,0 +1,115 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package lowmemjson
+
+import "unicode/utf8"
+
+const hex = "0123456789abcdef"
+
+// htmlSafeSet holds the value true if the ASCII character with the given
+// array position can be safely represented inside a JSON string, embedded
+// inside of HTML <script> tags, without any additional escaping.
+//
+// All values are true except for the ASCII control characters (0-31), the
+// double quote ("), the backslash character ("\"), HTML opening and closing
+// tags ("<" and ">"), and the ampersand ("&").
+var htmlSafeSet = [utf8.RuneSelf]bool{
+ ' ': true,
+ '!': true,
+ '"': false,
+ '#': true,
+ '$': true,
+ '%': true,
+ '&': false,
+ '\'': true,
+ '(': true,
+ ')': true,
+ '*': true,
+ '+': true,
+ ',': true,
+ '-': true,
+ '.': true,
+ '/': true,
+ '0': true,
+ '1': true,
+ '2': true,
+ '3': true,
+ '4': true,
+ '5': true,
+ '6': true,
+ '7': true,
+ '8': true,
+ '9': true,
+ ':': true,
+ ';': true,
+ '<': false,
+ '=': true,
+ '>': false,
+ '?': true,
+ '@': true,
+ 'A': true,
+ 'B': true,
+ 'C': true,
+ 'D': true,
+ 'E': true,
+ 'F': true,
+ 'G': true,
+ 'H': true,
+ 'I': true,
+ 'J': true,
+ 'K': true,
+ 'L': true,
+ 'M': true,
+ 'N': true,
+ 'O': true,
+ 'P': true,
+ 'Q': true,
+ 'R': true,
+ 'S': true,
+ 'T': true,
+ 'U': true,
+ 'V': true,
+ 'W': true,
+ 'X': true,
+ 'Y': true,
+ 'Z': true,
+ '[': true,
+ '\\': false,
+ ']': true,
+ '^': true,
+ '_': true,
+ '`': true,
+ 'a': true,
+ 'b': true,
+ 'c': true,
+ 'd': true,
+ 'e': true,
+ 'f': true,
+ 'g': true,
+ 'h': true,
+ 'i': true,
+ 'j': true,
+ 'k': true,
+ 'l': true,
+ 'm': true,
+ 'n': true,
+ 'o': true,
+ 'p': true,
+ 'q': true,
+ 'r': true,
+ 's': true,
+ 't': true,
+ 'u': true,
+ 'v': true,
+ 'w': true,
+ 'x': true,
+ 'y': true,
+ 'z': true,
+ '{': true,
+ '|': true,
+ '}': true,
+ '~': true,
+ '\u007f': true,
+}
diff --git a/lib/lowmemjson/borrowed_tags.go b/lib/lowmemjson/borrowed_tags.go
new file mode 100644
index 0000000..07292b1
--- /dev/null
+++ b/lib/lowmemjson/borrowed_tags.go
@@ -0,0 +1,38 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package lowmemjson
+
+import (
+ "strings"
+)
+
+// tagOptions is the string following a comma in a struct field's "json"
+// tag, or the empty string. It does not include the leading comma.
+type tagOptions string
+
+// parseTag splits a struct field's json tag into its name and
+// comma-separated options.
+func parseTag(tag string) (string, tagOptions) {
+ tag, opt, _ := strings.Cut(tag, ",")
+ return tag, tagOptions(opt)
+}
+
+// Contains reports whether a comma-separated list of options
+// contains a particular substr flag. substr must be surrounded by a
+// string boundary or commas.
+func (o tagOptions) Contains(optionName string) bool {
+ if len(o) == 0 {
+ return false
+ }
+ s := string(o)
+ for s != "" {
+ var name string
+ name, s, _ = strings.Cut(s, ",")
+ if name == optionName {
+ return true
+ }
+ }
+ return false
+}
diff --git a/lib/lowmemjson/encode.go b/lib/lowmemjson/encode.go
new file mode 100644
index 0000000..1fbd228
--- /dev/null
+++ b/lib/lowmemjson/encode.go
@@ -0,0 +1,429 @@
+// Copyright (C) 2022 Luke Shumaker <lukeshu@lukeshu.com>
+//
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+package lowmemjson
+
+import (
+ "bytes"
+ "encoding"
+ "encoding/json"
+ "io"
+ "reflect"
+ "sort"
+ "strconv"
+ "strings"
+ "unicode/utf8"
+)
+
+const Tab = "\t"
+
+type Encoder interface {
+ EncodeJSON(w io.Writer, prefix, indent string) error
+}
+
+type encodeError struct {
+ Err error
+}
+
+func writeByte(w io.Writer, b byte) {
+ var buf [1]byte
+ buf[0] = b
+ if _, err := w.Write(buf[:]); err != nil {
+ panic(encodeError{err})
+ }
+}
+
+func writeString(w io.Writer, str string) {
+ if _, err := io.WriteString(w, str); err != nil {
+ panic(encodeError{err})
+ }
+}
+
+func writeBytes[T interface{ ~[]byte | ~string }](w io.Writer, seq T) {
+ iface := any(seq)
+ if str, ok := iface.(string); ok {
+ if _, err := io.WriteString(w, str); err != nil {
+ panic(encodeError{err})
+ }
+ } else {
+ if _, err := w.Write(iface.([]byte)); err != nil {
+ panic(encodeError{err})
+ }
+ }
+}
+
+func Encode(w io.Writer, obj any, prefix, indent string) (err error) {
+ defer func() {
+ if r := recover(); r != nil {
+ if e, ok := r.(encodeError); ok {
+ err = e.Err
+ } else {
+ panic(r)
+ }
+ }
+ }()
+ encode(w, reflect.ValueOf(obj), prefix, indent, false)
+ return nil
+}
+
+var (
+ numberType = reflect.TypeOf(json.Number(""))
+ encoderType = reflect.TypeOf((*Encoder)(nil)).Elem()
+ jsonMarshalerType = reflect.TypeOf((*json.Marshaler)(nil)).Elem()
+ textMarshalerType = reflect.TypeOf((*encoding.TextMarshaler)(nil)).Elem()
+)
+
+func encode(w io.Writer, val reflect.Value, prefix, indent string, quote bool) {
+ if !val.IsValid() {
+ writeString(w, "null")
+ return
+ }
+ switch {
+
+ case val.Kind() != reflect.Pointer && val.CanAddr() && reflect.PointerTo(val.Type()).Implements(encoderType):
+ val = val.Addr()
+ fallthrough
+ case val.Type().Implements(encoderType):
+ if val.Kind() == reflect.Pointer && val.IsNil() {
+ writeString(w, "null")
+ return
+ }
+ obj, ok := val.Interface().(Encoder)
+ if !ok {
+ writeString(w, "null")
+ return
+ }
+ if err := obj.EncodeJSON(w, prefix, indent); err != nil {
+ panic(encodeError{err})
+ }
+
+ case val.Kind() != reflect.Pointer && val.CanAddr() && reflect.PointerTo(val.Type()).Implements(jsonMarshalerType):
+ val = val.Addr()
+ fallthrough
+ case val.Type().Implements(jsonMarshalerType):
+ if val.Kind() == reflect.Pointer && val.IsNil() {
+ writeString(w, "null")
+ return
+ }
+ obj, ok := val.Interface().(json.Marshaler)
+ if !ok {
+ writeString(w, "null")
+ return
+ }
+ dat, err := obj.MarshalJSON()
+ if err != nil {
+ panic(encodeError{err})
+ }
+ if _, err := w.Write(dat); err != nil {
+ panic(encodeError{err})
+ }
+
+ case val.Kind() != reflect.Pointer && val.CanAddr() && reflect.PointerTo(val.Type()).Implements(textMarshalerType):
+ val = val.Addr()
+ fallthrough
+ case val.Type().Implements(textMarshalerType):
+ if val.Kind() == reflect.Pointer && val.IsNil() {
+ writeString(w, "null")
+ return
+ }
+ obj, ok := val.Interface().(encoding.TextMarshaler)
+ if !ok {
+ writeString(w, "null")
+ return
+ }
+ text, err := obj.MarshalText()
+ if err != nil {
+ panic(encodeError{err})
+ }
+ encodeString(w, text)
+
+ default:
+ switch val.Kind() {
+ case reflect.Bool:
+ if quote {
+ writeByte(w, '"')
+ }
+ if val.Bool() {
+ writeString(w, "true")
+ } else {
+ writeString(w, "false")
+ }
+ if quote {
+ writeByte(w, '"')
+ }
+ case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+ if quote {
+ writeByte(w, '"')
+ }
+ writeString(w, strconv.FormatInt(val.Int(), 10))
+ if quote {
+ writeByte(w, '"')
+ }
+ case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
+ if quote {
+ writeByte(w, '"')
+ }
+ writeString(w, strconv.FormatUint(val.Uint(), 10))
+ if quote {
+ writeByte(w, '"')
+ }
+ case reflect.Float32, reflect.Float64:
+ if quote {
+ writeByte(w, '"')
+ }
+ encodeTODO(w, val, prefix, indent)
+ if quote {
+ writeByte(w, '"')
+ }
+ case reflect.String:
+ if val.Type() == numberType {
+ numStr := val.String()
+ if numStr == "" {
+ numStr = "0"
+ }
+ if quote {
+ writeByte(w, '"')
+ }
+ writeString(w, numStr)
+ if quote {
+ writeByte(w, '"')
+ }
+ } else {
+ if quote {
+ var buf bytes.Buffer
+ encodeString(&buf, val.String())
+ encodeString(w, buf.Bytes())
+ } else {
+ encodeString(w, val.String())
+ }
+ }
+ case reflect.Interface:
+ // .Kind() will only be reflect.Interface if
+ // there's no concrete type.
+ writeString(w, "null")
+ case reflect.Struct:
+ writeByte(w, '{')
+ var numFields int
+ subPrefix := prefix + indent
+ nextStructField:
+ for _, field := range indexStruct(val.Type()) {
+ fVal := val
+ for _, idx := range field.Path {
+ if fVal.Kind() == reflect.Pointer {
+ if fVal.IsNil() {
+ continue nextStructField
+ }
+ fVal = fVal.Elem()
+ }
+ fVal = fVal.Field(idx)
+ }
+ if field.OmitEmpty && isEmptyValue(fVal) {
+ continue nextStructField
+ }
+ if numFields > 0 {
+ writeByte(w, ',')
+ }
+ numFields++
+ writeByte(w, '\n')
+ writeString(w, subPrefix)
+ encodeString(w, field.Name)
+ writeString(w, ": ")
+ encode(w, fVal, subPrefix, indent, field.Quote)
+ }
+ if numFields > 0 {
+ writeByte(w, '\n')
+ writeString(w, prefix)
+ }
+ writeByte(w, '}')
+ case reflect.Map:
+ if val.IsNil() {
+ writeString(w, "null")
+ return
+ }
+ if val.Len() == 0 {
+ writeString(w, "{}")
+ return
+ }
+ writeByte(w, '{')
+
+ type kv struct {
+ K string
+ V reflect.Value
+ }
+ kvs := make([]kv, val.Len())
+ iter := val.MapRange()
+ for i := 0; iter.Next(); i++ {
+ var k strings.Builder
+ encode(&k, iter.Key(), "", Tab, false)
+ kStr := k.String()
+ if kStr == "null" {
+ kStr = `""`
+ }
+ kvs[i].K = kStr
+ kvs[i].V = iter.Value()
+ }
+ sort.Slice(kvs, func(i, j int) bool {
+ return kvs[i].K < kvs[j].K
+ })
+
+ subPrefix := prefix + indent
+ for i, kv := range kvs {
+ if i > 0 {
+ writeByte(w, ',')
+ }
+ writeByte(w, '\n')
+ writeString(w, subPrefix)
+ writeString(w, kv.K)
+ writeString(w, ": ")
+ encode(w, kv.V, subPrefix, indent, false)
+ }
+ writeByte(w, '\n')
+ writeString(w, prefix)
+ writeByte(w, '}')
+ case reflect.Slice:
+ switch {
+ case val.Type().Elem().Kind() == reflect.Uint8:
+ encodeTODO(w, val, prefix, indent)
+ case val.IsNil():
+ writeString(w, "null")
+ default:
+ encodeArray(w, val, prefix, indent)
+ }
+ case reflect.Array:
+ encodeArray(w, val, prefix, indent)
+ case reflect.Pointer:
+ if val.IsNil() {
+ writeString(w, "null")
+ } else {
+ encode(w, val.Elem(), prefix, indent, quote)
+ }
+ default:
+ panic(encodeError{&json.UnsupportedTypeError{
+ Type: val.Type(),
+ }})
+ }
+ }
+}
+
+func decodeRune[T interface{ ~[]byte | ~string }](s T) (r rune, size int) {
+ iface := any(s)
+ if str, ok := iface.(string); ok {
+ return utf8.DecodeRuneInString(str)
+ } else {
+ return utf8.DecodeRune(iface.([]byte))
+ }
+}
+
+// might as well be borrowed
+func encodeString[T interface{ ~[]byte | ~string }](w io.Writer, str T) {
+ writeByte(w, '"')
+ start := 0
+ for i := 0; i < len(str); {
+ if b := str[i]; b < utf8.RuneSelf {
+ if htmlSafeSet[b] {
+ i++
+ continue
+ }
+ if start < i {
+ writeBytes(w, str[start:i])
+ }
+ writeByte(w, '\\')
+ switch b {
+ case '\\', '"':
+ writeByte(w, b)
+ case '\n':
+ writeByte(w, 'n')
+ case '\r':
+ writeByte(w, 'r')
+ case '\t':
+ writeByte(w, 't')
+ default:
+ writeString(w, `u00`)
+ writeByte(w, hex[b>>4])
+ writeByte(w, hex[b&0xF])
+ }
+ i++
+ start = i
+ continue
+ }
+ c, size := decodeRune(str[i:])
+ if c == utf8.RuneError && size == 1 {
+ if start < i {
+ writeBytes(w, str[start:i])
+ }
+ writeString(w, `\ufffd`)
+ i += size
+ start = i
+ continue
+ }
+ // U+2028 is LINE SEPARATOR.
+ // U+2029 is PARAGRAPH SEPARATOR.
+ // They are both technically valid characters in JSON strings,
+ // but don't work in JSONP, which has to be evaluated as JavaScript,
+ // and can lead to security holes there. It is valid JSON to
+ // escape them, so we do so unconditionally.
+ // See http://timelessrepo.com/json-isnt-a-javascript-subset for discussion.
+ if c == '\u2028' || c == '\u2029' {
+ if start < i {
+ writeBytes(w, str[start:i])
+ }
+ writeString(w, `\u202`)
+ writeByte(w, hex[c&0xF])
+ i += size
+ start = i
+ continue
+ }
+ i += size
+ }
+ if start < len(str) {
+ writeBytes(w, str[start:])
+ }
+ writeByte(w, '"')
+}
+
+func encodeArray(w io.Writer, val reflect.Value, prefix, indent string) {
+ subPrefix := prefix + indent
+ writeByte(w, '[')
+ n := val.Len()
+ for i := 0; i < n; i++ {
+ if i > 0 {
+ writeByte(w, ',')
+ }
+ writeByte(w, '\n')
+ writeString(w, subPrefix)
+ encode(w, val.Index(i), subPrefix, indent, false)
+ }
+ writeByte(w, '\n')
+ writeString(w, prefix)
+ writeByte(w, ']')
+}
+
+// borrowed
+func isEmptyValue(v reflect.Value) bool {
+ switch v.Kind() {
+ case reflect.Array, reflect.Map, reflect.Slice, reflect.String:
+ return v.Len() == 0
+ case reflect.Bool:
+ return !v.Bool()
+ case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+ return v.Int() == 0
+ case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
+ return v.Uint() == 0
+ case reflect.Float32, reflect.Float64:
+ return v.Float() == 0
+ case reflect.Interface, reflect.Pointer:
+ return v.IsNil()
+ }
+ return false
+}
+
+func encodeTODO(w io.Writer, val reflect.Value, prefix, indent string) {
+ bs, err := json.MarshalIndent(val.Interface(), prefix, indent)
+ if err != nil {
+ panic(encodeError{err})
+ }
+ if _, err := w.Write(bs); err != nil {
+ panic(encodeError{err})
+ }
+}
diff --git a/lib/lowmemjson/struct.go b/lib/lowmemjson/struct.go
new file mode 100644
index 0000000..434d3dc
--- /dev/null
+++ b/lib/lowmemjson/struct.go
@@ -0,0 +1,137 @@
+// Copyright (C) 2022 Luke Shumaker <lukeshu@lukeshu.com>
+//
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+package lowmemjson
+
+import (
+ "reflect"
+)
+
+type structField struct {
+ Name string
+ Path []int
+ Tagged bool
+ OmitEmpty bool
+ Quote bool
+}
+
+func indexStruct(typ reflect.Type) []structField {
+ byName := make(map[string][]structField)
+ var byPos []string
+
+ indexStructInner(typ, nil, byName, &byPos)
+
+ var ret []structField
+
+ for _, name := range byPos {
+ fields := byName[name]
+ delete(byName, name)
+ switch len(fields) {
+ case 0:
+ // do nothing
+ case 1:
+ ret = append(ret, fields[0])
+ default:
+ // To quote the encoding/json docs (version 1.18.4):
+ //
+ // If there are multiple fields at the same level, and that level is the
+ // least nested (and would therefore be the nesting level selected by the
+ // usual Go rules), the following extra rules apply:
+ //
+ // 1) Of those fields, if any are JSON-tagged, only tagged fields are
+ // considered, even if there are multiple untagged fields that would
+ // otherwise conflict.
+ //
+ // 2) If there is exactly one field (tagged or not according to the first
+ // rule), that is selected.
+ //
+ // 3) Otherwise there are multiple fields, and all are ignored; no error
+ // occurs.
+ leastLevel := len(fields[0].Path)
+ for _, field := range fields[1:] {
+ if len(field.Path) < leastLevel {
+ leastLevel = len(field.Path)
+ }
+ }
+ var numUntagged, numTagged int
+ var untaggedIdx, taggedIdx int
+ for i, field := range fields {
+ if len(field.Path) != leastLevel {
+ continue
+ }
+ if field.Tagged {
+ numTagged++
+ taggedIdx = i
+ if numTagged > 1 {
+ break // optimization
+ }
+ } else {
+ numUntagged++
+ untaggedIdx = i
+ }
+ }
+ switch numTagged {
+ case 0:
+ switch numUntagged {
+ case 0:
+ // do nothing
+ case 1:
+ ret = append(ret, fields[untaggedIdx])
+ }
+ case 1:
+ ret = append(ret, fields[taggedIdx])
+ }
+ }
+ }
+
+ return ret
+}
+
+func indexStructInner(typ reflect.Type, prefix []int, byName map[string][]structField, byPos *[]string) {
+ n := typ.NumField()
+ for i := 0; i < n; i++ {
+ path := append(append([]int(nil), prefix...), i)
+
+ fTyp := typ.Field(i)
+ var embed bool
+ if fTyp.Anonymous {
+ t := fTyp.Type
+ if t.Kind() == reflect.Pointer {
+ t = t.Elem()
+ }
+ if !fTyp.IsExported() && t.Kind() != reflect.Struct {
+ continue
+ }
+ embed = t.Kind() == reflect.Struct
+ } else if !fTyp.IsExported() {
+ continue
+ }
+ tag := fTyp.Tag.Get("json")
+ if tag == "-" {
+ continue
+ }
+ tagName, opts := parseTag(tag)
+ name := tagName
+ if name == "" {
+ name = fTyp.Name
+ }
+
+ if embed {
+ t := fTyp.Type
+ if t.Kind() == reflect.Pointer {
+ t = t.Elem()
+ }
+ indexStructInner(t, path, byName, byPos)
+ } else {
+ byName[name] = append(byName[name], structField{
+ Name: name,
+ Path: path,
+ Tagged: tagName != "",
+ OmitEmpty: opts.Contains("omitempty"),
+ Quote: opts.Contains("string"),
+ })
+ *byPos = append(*byPos, name)
+ }
+ }
+}
generated by cgit v1.2.3-2-g168b (git 2.25.1) at 2025-03-16 10:20:59 +0000