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// Copyright (C) 2022-2023 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
package lowmemjson
import (
"errors"
"io"
"strings"
"testing"
"github.com/stretchr/testify/assert"
"git.lukeshu.com/go/lowmemjson/internal/fastio"
)
func TestEncodeReEncode(t *testing.T) {
t.Parallel()
type testcase struct {
enc ReEncoderConfig
in any
exp string
}
testcases := map[string]testcase{
"basic": {
enc: ReEncoderConfig{
Indent: "\t",
CompactIfUnder: 10,
},
in: map[string][]string{
"a": {"b", "c"},
"d": {"eeeeeeeeeeeeeee"},
},
exp: `{
"a": ["b","c"],
"d": [
"eeeeeeeeeeeeeee"
]
}`,
},
"arrays1": {
enc: ReEncoderConfig{
Indent: "\t",
CompactIfUnder: 10,
ForceTrailingNewlines: true,
},
in: []any{
map[string]any{
"generation": 123456,
},
map[string]any{
"a": 1,
},
map[string]any{
"generation": 7891011213,
},
},
exp: `[
{
"generation": 123456
},
{"a":1},
{
"generation": 7891011213
}
]
`,
},
"arrays2": {
enc: ReEncoderConfig{
Indent: "\t",
CompactIfUnder: 15,
ForceTrailingNewlines: true,
},
in: []any{
map[string]any{
"a": 1,
"b": 2,
},
map[string]any{
"generation": 123456,
},
map[string]any{
"generation": 7891011213,
},
},
exp: `[
{"a":1,"b":2},
{
"generation": 123456
},
{
"generation": 7891011213
}
]
`,
},
"arrays3": {
enc: ReEncoderConfig{
Indent: "\t",
ForceTrailingNewlines: true,
},
in: []any{
map[string]any{
"a": 1,
},
map[string]any{
"generation": 123456,
},
map[string]any{
"generation": 7891011213,
},
},
exp: `[
{
"a": 1
},
{
"generation": 123456
},
{
"generation": 7891011213
}
]
`,
},
"indent-unicode": {
enc: ReEncoderConfig{
Prefix: "—",
Indent: "»",
},
in: []int{9},
exp: `[
—»9
—]`,
},
"numbers": {
enc: ReEncoderConfig{
Compact: true,
CompactFloats: true,
},
in: []any{
Number("1.200e003"),
},
exp: `[1.2e3]`,
},
"numbers-zero": {
enc: ReEncoderConfig{
Compact: true,
CompactFloats: true,
},
in: []any{
Number("1.000e000"),
},
exp: `[1.0e0]`,
},
}
for tcName, tc := range testcases {
tc := tc
t.Run(tcName, func(t *testing.T) {
t.Parallel()
var out strings.Builder
enc := NewEncoder(NewReEncoder(&out, tc.enc))
assert.NoError(t, enc.Encode(tc.in))
assert.Equal(t, tc.exp, out.String())
})
}
}
func TestReEncode(t *testing.T) {
t.Parallel()
type testcase struct {
Cfg ReEncoderConfig
In string
ExpOut string
ExpWriteErr string
ExpCloseErr string
}
testcases := map[string]testcase{
"partial-utf8-replace": {Cfg: ReEncoderConfig{InvalidUTF8: InvalidUTF8Replace}, In: "\xf0\xbf", ExpOut: ``, ExpCloseErr: "json: syntax error at input byte 0: invalid character '\uFFFD' looking for beginning of value"},
"partial-utf8-preserve": {Cfg: ReEncoderConfig{InvalidUTF8: InvalidUTF8Preserve}, In: "\xf0\xbf", ExpOut: ``, ExpCloseErr: `json: syntax error at input byte 0: invalid character '\xf0' looking for beginning of value`},
"partial-utf8-error": {Cfg: ReEncoderConfig{InvalidUTF8: InvalidUTF8Error}, In: "\xf0\xbf", ExpOut: ``, ExpCloseErr: `json: syntax error at input byte 0: truncated UTF-8: "\xf0\xbf"`},
}
for tcName, tc := range testcases {
tc := tc
t.Run(tcName, func(t *testing.T) {
t.Parallel()
var out strings.Builder
enc := NewReEncoder(&out, tc.Cfg)
_, err := enc.WriteString(tc.In)
assert.Equal(t, tc.ExpOut, out.String())
if tc.ExpWriteErr == "" {
assert.NoError(t, err)
} else {
assert.EqualError(t, err, tc.ExpWriteErr)
}
err = enc.Close()
if tc.ExpCloseErr == "" {
assert.NoError(t, err)
} else {
assert.EqualError(t, err, tc.ExpCloseErr)
}
})
}
}
func TestReEncodeWriteSize(t *testing.T) {
t.Parallel()
multibyteRune := `😂`
assert.Len(t, multibyteRune, 4)
input := `"` + multibyteRune + `"`
t.Run("bytes-bigwrite", func(t *testing.T) {
t.Parallel()
var out strings.Builder
enc := NewReEncoder(&out, ReEncoderConfig{})
n, err := enc.Write([]byte(input))
assert.NoError(t, err)
assert.Equal(t, len(input), n)
assert.Equal(t, input, out.String())
})
t.Run("string-bigwrite", func(t *testing.T) {
t.Parallel()
var out strings.Builder
enc := NewReEncoder(&out, ReEncoderConfig{})
n, err := enc.WriteString(input)
assert.NoError(t, err)
assert.Equal(t, len(input), n)
assert.Equal(t, input, out.String())
})
t.Run("bytes-smallwrites", func(t *testing.T) {
t.Parallel()
var out strings.Builder
enc := NewReEncoder(&out, ReEncoderConfig{})
var buf [1]byte
for i := 0; i < len(input); i++ {
buf[0] = input[i]
n, err := enc.Write(buf[:])
assert.NoError(t, err)
assert.Equal(t, 1, n)
}
assert.Equal(t, input, out.String())
})
t.Run("string-smallwrites", func(t *testing.T) {
t.Parallel()
var out strings.Builder
enc := NewReEncoder(&out, ReEncoderConfig{})
for i := 0; i < len(input); i++ {
n, err := enc.WriteString(input[i : i+1])
assert.NoError(t, err)
assert.Equal(t, 1, n)
}
assert.Equal(t, input, out.String())
})
}
func TestReEncoderStackSize(t *testing.T) {
t.Parallel()
enc := NewReEncoder(fastio.Discard, ReEncoderConfig{})
assert.Equal(t, 0, enc.stackSize())
for i := 0; i < 5; i++ {
assert.NoError(t, enc.WriteByte('['))
assert.Equal(t, i+1, enc.stackSize())
enc.pushWriteBarrier()
assert.Equal(t, i+2, enc.stackSize())
}
}
var errNoSpace = errors.New("no space left on device")
type limitedWriter struct {
Limit int
Inner io.Writer
n int
}
func (w *limitedWriter) Write(p []byte) (int, error) {
switch {
case w.n >= w.Limit:
return 0, errNoSpace
case w.n+len(p) > w.Limit:
n, err := w.Inner.Write(p[:w.Limit-w.n])
if n > 0 {
w.n += n
}
if err == nil {
err = errNoSpace
}
return n, err
default:
n, err := w.Inner.Write(p)
if n > 0 {
w.n += n
}
return n, err
}
}
func TestReEncodeIOErr(t *testing.T) {
t.Parallel()
input := `"😀"`
assert.Len(t, input, 6)
t.Run("bytes", func(t *testing.T) {
t.Parallel()
var out strings.Builder
enc := NewReEncoder(&limitedWriter{Limit: 5, Inner: &out}, ReEncoderConfig{})
n, err := enc.Write([]byte(input[:2]))
assert.NoError(t, err)
assert.Equal(t, 2, n)
// Of the 2 bytes "written", only one should be in
// `out` yet; the other should be in the UTF-8 buffer.
assert.Equal(t, input[:1], out.String())
n, err = enc.Write([]byte(input[2:]))
assert.ErrorIs(t, err, errNoSpace)
// Check that the byte in the UTF-8 buffer from the
// first .Write didn't count toward the total for this
// .Write.
assert.Equal(t, 3, n)
assert.Equal(t, input[:5], out.String())
})
t.Run("string", func(t *testing.T) {
t.Parallel()
var out strings.Builder
enc := NewReEncoder(&limitedWriter{Limit: 5, Inner: &out}, ReEncoderConfig{})
n, err := enc.WriteString(input[:2])
assert.NoError(t, err)
assert.Equal(t, 2, n)
// Of the 2 bytes "written", only one should be in
// `out` yet; the other should be in the UTF-8 buffer.
assert.Equal(t, input[:1], out.String())
n, err = enc.WriteString(input[2:])
assert.ErrorIs(t, err, errNoSpace)
// Check that the byte in the UTF-8 buffer from the
// first .Write didn't count toward the total for this
// .Write.
assert.Equal(t, 3, n)
assert.Equal(t, input[:5], out.String())
})
}
|
