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// Copyright 2015 Google Inc. All rights reserved
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package kati
import (
"io"
"sync"
)
var (
ebufFree = sync.Pool{
New: func() interface{} { return new(evalBuffer) },
}
wbufFree = sync.Pool{
New: func() interface{} { return new(wordBuffer) },
}
)
func writeByte(w io.Writer, b byte) error {
if bw, ok := w.(io.ByteWriter); ok {
return bw.WriteByte(b)
}
_, err := w.Write([]byte{b})
return err
}
// use io.WriteString to stringWrite.
type ssvWriter struct {
io.Writer
sep bool
}
func (w *ssvWriter) writeWord(word []byte) {
if w.sep {
writeByte(w.Writer, ' ')
}
w.sep = true
w.Writer.Write(word)
}
func (w *ssvWriter) writeWordString(word string) {
if w.sep {
writeByte(w.Writer, ' ')
}
w.sep = true
io.WriteString(w.Writer, word)
}
func (w *ssvWriter) resetSep() {
w.sep = false
}
type buffer struct {
buf []byte
bootstrap [64]byte // memory to hold first slice
}
func (b *buffer) Write(data []byte) (int, error) {
b.buf = append(b.buf, data...)
return len(data), nil
}
func (b *buffer) WriteByte(c byte) error {
b.buf = append(b.buf, c)
return nil
}
func (b *buffer) WriteString(s string) (int, error) {
b.buf = append(b.buf, []byte(s)...)
return len(s), nil
}
func (b *buffer) Bytes() []byte { return b.buf }
func (b *buffer) Len() int { return len(b.buf) }
func (b *buffer) String() string { return string(b.buf) }
func (b *buffer) Reset() {
if b.buf == nil {
b.buf = b.bootstrap[:0]
}
b.buf = b.buf[:0]
}
type evalBuffer struct {
buffer
ssvWriter
args [][]byte
}
func newEbuf() *evalBuffer {
buf := ebufFree.Get().(*evalBuffer)
buf.Reset()
return buf
}
func (buf *evalBuffer) release() {
if cap(buf.Bytes()) > 1024 {
return
}
buf.Reset()
buf.args = buf.args[:0]
ebufFree.Put(buf)
}
func (b *evalBuffer) Reset() {
b.buffer.Reset()
b.resetSep()
}
func (b *evalBuffer) resetSep() {
if b.ssvWriter.Writer == nil {
b.ssvWriter.Writer = &b.buffer
}
b.ssvWriter.resetSep()
}
type wordBuffer struct {
buf buffer
words [][]byte
}
func newWbuf() *wordBuffer {
buf := wbufFree.Get().(*wordBuffer)
buf.Reset()
return buf
}
func (buf *wordBuffer) release() {
if cap(buf.Bytes()) > 1024 {
return
}
buf.Reset()
wbufFree.Put(buf)
}
func (wb *wordBuffer) Write(data []byte) (int, error) {
if len(data) == 0 {
return 0, nil
}
off := len(wb.buf.buf)
var cont bool
if !isWhitespace(rune(data[0])) && len(wb.buf.buf) > 0 {
cont = !isWhitespace(rune(wb.buf.buf[off-1]))
}
ws := newWordScanner(data)
for ws.Scan() {
if cont {
word := wb.words[len(wb.words)-1]
wb.words = wb.words[:len(wb.words)-1]
wb.buf.buf = wb.buf.buf[:len(wb.buf.buf)-len(word)]
var w []byte
w = append(w, word...)
w = append(w, ws.Bytes()...)
wb.writeWord(w)
cont = false
continue
}
wb.writeWord(ws.Bytes())
}
if isWhitespace(rune(data[len(data)-1])) {
wb.buf.buf = append(wb.buf.buf, ' ')
}
return len(data), nil
}
func (wb *wordBuffer) WriteByte(c byte) error {
_, err := wb.Write([]byte{c})
return err
}
func (wb *wordBuffer) WriteString(s string) (int, error) {
return wb.Write([]byte(s))
}
func (wb *wordBuffer) writeWord(word []byte) {
if len(wb.buf.buf) > 0 {
wb.buf.buf = append(wb.buf.buf, ' ')
}
off := len(wb.buf.buf)
wb.buf.buf = append(wb.buf.buf, word...)
wb.words = append(wb.words, wb.buf.buf[off:off+len(word)])
}
func (wb *wordBuffer) writeWordString(word string) {
wb.writeWord([]byte(word))
}
func (wb *wordBuffer) Reset() {
wb.buf.Reset()
wb.words = nil
}
func (wb *wordBuffer) resetSep() {}
func (wb *wordBuffer) Bytes() []byte {
return wb.buf.Bytes()
}
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