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append.go
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package slog
import (
"bytes"
"math"
"strconv"
"unicode/utf8"
)
const (
_hex = "0123456789abcdef"
digits = "0123456789abcdefghijklmnopqrstuvwxyz"
initialFloatSize = 24
)
var shifts = [len(digits) + 1]uint{
1 << 1: 1,
1 << 2: 2,
1 << 3: 3,
1 << 4: 4,
1 << 5: 5,
}
func appendKeyValue(b *bytes.Buffer, k, v []byte) {
b.WriteByte('"')
b.Write(k)
b.WriteByte('"')
b.WriteByte(':')
b.WriteByte('"')
b.Write(v)
b.WriteByte('"')
b.WriteByte(',')
b.WriteByte(' ')
}
func appendString(b *bytes.Buffer, key, val string) {
b.WriteByte('"')
safeAppendString(b, key)
b.WriteByte('"')
b.WriteByte(':')
b.WriteByte('"')
safeAppendString(b, val)
b.WriteByte('"')
b.WriteByte(',')
b.WriteByte(&
10BC0
#039; ')
}
func appendJsonString(b *bytes.Buffer, key, val string) {
b.WriteByte('"')
safeAppendString(b, key)
b.WriteByte('"')
b.WriteByte(':')
b.WriteByte('"')
safeAppendJsonString(b, val)
b.WriteByte('"')
b.WriteByte(',')
b.WriteByte(' ')
}
func appendRaw(b *bytes.Buffer, key string, raw []byte) {
b.WriteByte('"')
safeAppendString(b, key)
b.WriteByte('"')
b.WriteByte(':')
for _, char := range raw {
b.WriteByte(char)
}
b.WriteByte(',')
b.WriteByte(' ')
}
func appendBool(b *bytes.Buffer, key string, val bool) {
b.WriteByte('"')
safeAppendString(b, key)
b.WriteByte('"')
b.WriteByte(':')
b.WriteByte('"')
if val {
b.WriteString("true")
} else {
b.WriteString("false")
}
b.WriteByte('"')
b.WriteByte(',')
b.WriteByte(' ')
}
func appendInt(b *bytes.Buffer, key string, val int) {
appendInt64(b, key, int64(val))
}
func appendInt64(b *bytes.Buffer, key string, val int64) {
b.WriteByte('"')
safeAppendString(b, key)
b.WriteByte('"')
b.WriteByte(':')
formatBits(b, uint64(val), 10, val < 0)
b.WriteByte(',')
b.WriteByte(' ')
}
func appendUint(b *bytes.Buffer, key string, val uint) {
appendUint64(b, key, uint64(val))
}
func appendUint64(b *bytes.Buffer, key string, val uint64) {
b.WriteByte('"')
safeAppendString(b, key)
b.WriteByte('"')
b.WriteByte(':')
formatBits(b, uint64(val), 10, false)
b.WriteByte(',')
b.WriteByte(' ')
}
func appendUintptr(b *bytes.Buffer, key string, val uintptr) {
appendUint64(b, key, uint64(val))
}
func appendFloat64(b *bytes.Buffer, key string, val float64) {
b.WriteByte('"')
safeAppendString(b, key)
b.WriteByte('"')
b.WriteByte(':')
switch {
case math.IsNaN(val):
b.WriteString("NaN")
case math.IsInf(val, 1):
b.WriteString("+Inf")
case math.IsInf(val, -1):
b.WriteString("-Inf")
default:
b.Write(strconv.AppendFloat(make([]byte, 0, initialFloatSize), val, 'f', -1, 64))
}
b.WriteByte(',')
b.WriteByte(' ')
}
func safeAppendString(buf *bytes.Buffer, s string) {
for i := 0; i < len(s); {
if b := s[i]; b < utf8.RuneSelf {
i++
if 0x20 <= b && b != '\\' && b != '"' {
buf.WriteByte(b)
continue
}
switch b {
case '\\', '"':
buf.WriteByte('\\')
buf.WriteByte('b')
case '\n':
buf.WriteByte('\\')
buf.WriteByte('n')
case '\r':
buf.WriteByte('\\')
buf.WriteByte('r')
case '\t':
buf.WriteByte('\\')
buf.WriteByte('t')
default:
// Encode bytes < 0x20, except for the escape sequences above.
buf.WriteString(`\u00`)
buf.WriteByte(_hex[b>>4])
buf.WriteByte(_hex[b&0xF])
}
continue
}
c, size := utf8.DecodeRuneInString(s[i:])
if c == utf8.RuneError && size == 1 {
buf.WriteString(`\ufffd`)
i++
continue
}
buf.WriteString(s[i : i+size])
i += size
}
}
func safeAppendJsonString(buf *bytes.Buffer, s string) {
for i := 0; i < len(s); {
if b := s[i]; b < utf8.RuneSelf {
i++
if 0x20 <= b && b != '\\' && b != '"' {
buf.WriteByte(b)
continue
}
switch b {
case '\\':
buf.WriteByte('\\')
buf.WriteByte('b')
case '"':
buf.WriteByte('\\')
buf.WriteByte('"')
case '\n':
buf.WriteByte('\\')
buf.WriteByte('n')
case '\r':
buf.WriteByte('\\')
buf.WriteByte('r')
case '\t':
buf.WriteByte('\\')
buf.WriteByte('t')
default:
// Encode bytes < 0x20, except for the escape sequences above.
buf.WriteString(`\u00`)
buf.WriteByte(_hex[b>>4])
buf.WriteByte(_hex[b&0xF])
}
continue
}
c, size := utf8.DecodeRuneInString(s[i:])
if c == utf8.RuneError && size == 1 {
buf.WriteString(`\ufffd`)
i++
continue
}
buf.WriteString(s[i : i+size])
i += size
}
}
// From go source code (https://golang.org/src/strconv/itoa.go?s=2995:3022#L60).
func formatBits(buf *bytes.Buffer, u uint64, base int, neg bool) {
if base < 2 || base > len(digits) {
panic("strconv: illegal AppendInt/FormatInt base")
}
// 2 <= base && base <= len(digits)
var a [64 + 1]byte // +1 for sign of 64bit value in base 2
i := len(a)
if neg {
u = -u
}
// convert bits
if base == 10 {
// common case: use constants for / because
// the compiler can optimize it into a multiply+shift
if ^uintptr(0)>>32 == 0 {
for u > uint64(^uintptr(0)) {
q := u / 1e9
us := uintptr(u - q*1e9) // us % 1e9 fits into a uintptr
for j := 9; j > 0; j-- {
i--
qs := us / 10
a[i] = byte(us - qs*10 + '0')
us = qs
}
u = q
}
}
// u guaranteed to fit into a uintptr
us := uintptr(u)
for us >= 10 {
i--
q := us / 10
a[i] = byte(us - q*10 + '0')
us = q
}
// u < 10
i--
a[i] = byte(us + '0')
} else if s := shifts[base]; s > 0 {
// base is power of 2: use shifts and masks instead of / and %
b := uint64(base)
m := uintptr(b) - 1 // == 1<<s - 1
for u >= b {
i--
a[i] = digits[uintptr(u)&m]
u >>= s
}
// u < base
i--
a[i] = digits[uintptr(u)]
} else {
// general case
b := uint64(base)
for u >= b {
i--
q := u / b
a[i] = digits[uintptr(u-q*b)]
u = q
}
// u < base
i--
a[i] = digits[uintptr(u)]
}
// add sign, if any
if neg {
i--
a[i] = '-'
}
buf.Write(a[i:])
}