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package format
import (
"io"
"unicode/utf8"
"unsafe"
)
// ensure we conform to io.Writer.
var _ io.Writer = (*Buffer)(nil)
// Buffer is a simple wrapper around a byte slice.
type Buffer struct {
B []byte
}
// Write will append given byte slice to buffer, fulfilling io.Writer.
func (buf *Buffer) Write(b []byte) (int, error) {
buf.B = append(buf.B, b...)
return len(b), nil
}
// AppendByte appends given byte to the buffer.
func (buf *Buffer) AppendByte(b byte) {
buf.B = append(buf.B, b)
}
// AppendRune appends given rune to the buffer.
func (buf *Buffer) AppendRune(r rune) {
if r < utf8.RuneSelf {
buf.B = append(buf.B, byte(r))
return
}
l := buf.Len()
for i := 0; i < utf8.UTFMax; i++ {
buf.B = append(buf.B, 0)
}
n := utf8.EncodeRune(buf.B[l:buf.Len()], r)
buf.B = buf.B[:l+n]
}
// Append will append given byte slice to the buffer.
func (buf *Buffer) Append(b []byte) {
buf.B = append(buf.B, b...)
}
// AppendString appends given string to the buffer.
func (buf *Buffer) AppendString(s string) {
buf.B = append(buf.B, s...)
}
// Len returns the length of the buffer's underlying byte slice.
func (buf *Buffer) Len() int {
return len(buf.B)
}
// Cap returns the capacity of the buffer's underlying byte slice.
func (buf *Buffer) Cap() int {
return cap(buf.B)
}
// Truncate will reduce the length of the buffer by 'n'.
func (buf *Buffer) Truncate(n int) {
if n > len(buf.B) {
n = len(buf.B)
}
buf.B = buf.B[:buf.Len()-n]
}
// Reset will reset the buffer length to 0 (retains capacity).
func (buf *Buffer) Reset() {
buf.B = buf.B[:0]
}
// String returns the underlying byte slice as a string. Please note
// this value is tied directly to the underlying byte slice, if you
// write to the buffer then returned string values will also change.
func (buf *Buffer) String() string {
return *(*string)(unsafe.Pointer(&buf.B))
}
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