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text.go
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text.go
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package plog
import (
"fmt"
"io"
"strings"
"sync"
"time"
"unicode"
"unicode/utf8"
)
const (
separator = "="
indentSeparator = " │ "
)
func (l *Logger) writeIndent(w io.Writer, str string, indent string, newline bool, key string) {
st := l.styles
// kindly borrowed from hclog
for {
nl := strings.IndexByte(str, '\n')
if nl == -1 {
if str != "" {
_, _ = w.Write([]byte(indent))
val := escapeStringForOutput(str, false)
if valueStyle, ok := st.Values[key]; ok {
val = valueStyle.Renderer(l.re).Render(val)
} else {
val = st.Value.Renderer(l.re).Render(val)
}
_, _ = w.Write([]byte(val))
if newline {
_, _ = w.Write([]byte{'\n'})
}
}
return
}
_, _ = w.Write([]byte(indent))
val := escapeStringForOutput(str[:nl], false)
val = st.Value.Renderer(l.re).Render(val)
_, _ = w.Write([]byte(val))
_, _ = w.Write([]byte{'\n'})
str = str[nl+1:]
}
}
func needsEscaping(str string) bool {
for _, b := range str {
if !unicode.IsPrint(b) || b == '"' {
return true
}
}
return false
}
const (
lowerhex = "0123456789abcdef"
)
var bufPool = sync.Pool{
New: func() interface{} {
return new(strings.Builder)
},
}
func escapeStringForOutput(str string, escapeQuotes bool) string {
// kindly borrowed from hclog
if !needsEscaping(str) {
return str
}
bb := bufPool.Get().(*strings.Builder)
bb.Reset()
defer bufPool.Put(bb)
for _, r := range str {
if escapeQuotes && r == '"' {
bb.WriteString(`\"`)
} else if unicode.IsPrint(r) {
bb.WriteRune(r)
} else {
switch r {
case '\a':
bb.WriteString(`\a`)
case '\b':
bb.WriteString(`\b`)
case '\f':
bb.WriteString(`\f`)
case '\n':
bb.WriteString(`\n`)
case '\r':
bb.WriteString(`\r`)
case '\t':
bb.WriteString(`\t`)
case '\v':
bb.WriteString(`\v`)
default:
switch {
case r < ' ':
bb.WriteString(`\x`)
bb.WriteByte(lowerhex[byte(r)>>4])
bb.WriteByte(lowerhex[byte(r)&0xF])
case !utf8.ValidRune(r):
r = 0xFFFD
fallthrough
case r < 0x10000:
bb.WriteString(`\u`)
for s := 12; s >= 0; s -= 4 {
bb.WriteByte(lowerhex[r>>uint(s)&0xF])
}
default:
bb.WriteString(`\U`)
for s := 28; s >= 0; s -= 4 {
bb.WriteByte(lowerhex[r>>uint(s)&0xF])
}
}
}
}
}
return bb.String()
}
func needsQuoting(s string) bool {
for i := 0; i < len(s); {
b := s[i]
if b < utf8.RuneSelf {
if needsQuotingSet[b] {
return true
}
i++
continue
}
r, size := utf8.DecodeRuneInString(s[i:])
if r == utf8.RuneError || unicode.IsSpace(r) || !unicode.IsPrint(r) {
return true
}
i += size
}
return false
}
var needsQuotingSet = [utf8.RuneSelf]bool{
'"': true,
'=': true,
}
func init() {
for i := 0; i < utf8.RuneSelf; i++ {
r := rune(i)
if unicode.IsSpace(r) || !unicode.IsPrint(r) {
needsQuotingSet[i] = true
}
}
}
func writeSpace(w io.Writer, first bool) {
if !first {
w.Write([]byte{' '}) //nolint: errcheck
}
}
func (l *Logger) textFormatter(keyvals ...interface{}) {
st := l.styles
lenKeyvals := len(keyvals)
for i := 0; i < lenKeyvals; i += 2 {
firstKey := i == 0
moreKeys := i < lenKeyvals-2
switch keyvals[i] {
case TimestampKey:
if t, ok := keyvals[i+1].(time.Time); ok {
ts := t.Format(l.timeFormat)
ts = st.Timestamp.Renderer(l.re).Render(ts)
writeSpace(&l.b, firstKey)
l.b.WriteString(ts)
}
case LevelKey:
if level, ok := keyvals[i+1].(Level); ok {
var lvl string
lvlStyle, ok := st.Levels[level]
if !ok {
continue
}
lvl = lvlStyle.Renderer(l.re).String()
if lvl != "" {
writeSpace(&l.b, firstKey)
l.b.WriteString(lvl)
}
}
case CallerKey:
if caller, ok := keyvals[i+1].(string); ok {
caller = fmt.Sprintf("<%s>", caller)
caller = st.Caller.Renderer(l.re).Render(caller)
writeSpace(&l.b, firstKey)
l.b.WriteString(caller)
}
case PrefixKey:
if prefix, ok := keyvals[i+1].(string); ok {
prefix = st.Prefix.Renderer(l.re).Render(prefix + ":")
writeSpace(&l.b, firstKey)
l.b.WriteString(prefix)
}
case MessageKey:
if msg := keyvals[i+1]; msg != nil {
m := fmt.Sprint(msg)
m = st.Message.Renderer(l.re).Render(m)
writeSpace(&l.b, firstKey)
l.b.WriteString(m)
}
default:
sep := separator
indentSep := indentSeparator
sep = st.Separator.Renderer(l.re).Render(sep)
indentSep = st.Separator.Renderer(l.re).Render(indentSep)
key := fmt.Sprint(keyvals[i])
val := fmt.Sprintf("%+v", keyvals[i+1])
raw := val == ""
if raw {
val = `""`
}
if key == "" {
continue
}
actualKey := key
valueStyle := st.Value
if vs, ok := st.Values[actualKey]; ok {
valueStyle = vs
}
if keyStyle, ok := st.Keys[key]; ok {
key = keyStyle.Renderer(l.re).Render(key)
} else {
key = st.Key.Renderer(l.re).Render(key)
}
// Values may contain multiple lines, and that format
// is preserved, with each line prefixed with a " | "
// to show it's part of a collection of lines.
//
// Values may also need quoting, if not all the runes
// in the value string are "normal", like if they
// contain ANSI escape sequences.
if strings.Contains(val, "\n") {
l.b.WriteString("\n ")
l.b.WriteString(key)
l.b.WriteString(sep + "\n")
l.writeIndent(&l.b, val, indentSep, moreKeys, actualKey)
} else if !raw && needsQuoting(val) {
writeSpace(&l.b, firstKey)
l.b.WriteString(key)
l.b.WriteString(sep)
l.b.WriteString(valueStyle.Renderer(l.re).Render(fmt.Sprintf(`"%s"`,
escapeStringForOutput(val, true))))
} else {
val = valueStyle.Renderer(l.re).Render(val)
writeSpace(&l.b, firstKey)
l.b.WriteString(key)
l.b.WriteString(sep)
l.b.WriteString(val)
}
}
}
// Add a newline to the end of the log message.
l.b.WriteByte('\n')
}