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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package bufio
import (
"bytes"
"fmt"
"io"
"os"
"strings"
"testing"
"testing/iotest"
"utf8"
)
// Reads from a reader and rot13s the result.
type rot13Reader struct {
r io.Reader
}
func newRot13Reader(r io.Reader) *rot13Reader {
r13 := new(rot13Reader)
r13.r = r
return r13
}
func (r13 *rot13Reader) Read(p []byte) (int, os.Error) {
n, e := r13.r.Read(p)
if e != nil {
return n, e
}
for i := 0; i < n; i++ {
c := p[i] | 0x20 // lowercase byte
if 'a' <= c && c <= 'm' {
p[i] += 13
} else if 'n' <= c && c <= 'z' {
p[i] -= 13
}
}
return n, nil
}
// Call ReadByte to accumulate the text of a file
func readBytes(buf *Reader) string {
var b [1000]byte
nb := 0
for {
c, e := buf.ReadByte()
if e == os.EOF {
break
}
if e != nil {
panic("Data: " + e.String())
}
b[nb] = c
nb++
}
return string(b[0:nb])
}
func TestReaderSimple(t *testing.T) {
data := "hello world"
b := NewReader(bytes.NewBufferString(data))
if s := readBytes(b); s != "hello world" {
t.Errorf("simple hello world test failed: got %q", s)
}
b = NewReader(newRot13Reader(bytes.NewBufferString(data)))
if s := readBytes(b); s != "uryyb jbeyq" {
t.Errorf("rot13 hello world test failed: got %q", s)
}
}
type readMaker struct {
name string
fn func(io.Reader) io.Reader
}
var readMakers = []readMaker{
{"full", func(r io.Reader) io.Reader { return r }},
{"byte", iotest.OneByteReader},
{"half", iotest.HalfReader},
{"data+err", iotest.DataErrReader},
}
// Call ReadString (which ends up calling everything else)
// to accumulate the text of a file.
func readLines(b *Reader) string {
s := ""
for {
s1, e := b.ReadString('\n')
if e == os.EOF {
break
}
if e != nil {
panic("GetLines: " + e.String())
}
s += s1
}
return s
}
// Call Read to accumulate the text of a file
func reads(buf *Reader, m int) string {
var b [1000]byte
nb := 0
for {
n, e := buf.Read(b[nb : nb+m])
nb += n
if e == os.EOF {
break
}
}
return string(b[0:nb])
}
type bufReader struct {
name string
fn func(*Reader) string
}
var bufreaders = []bufReader{
{"1", func(b *Reader) string { return reads(b, 1) }},
{"2", func(b *Reader) string { return reads(b, 2) }},
{"3", func(b *Reader) string { return reads(b, 3) }},
{"4", func(b *Reader) string { return reads(b, 4) }},
{"5", func(b *Reader) string { return reads(b, 5) }},
{"7", func(b *Reader) string { return reads(b, 7) }},
{"bytes", readBytes},
{"lines", readLines},
}
var bufsizes = []int{
1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
23, 32, 46, 64, 93, 128, 1024, 4096,
}
func TestReader(t *testing.T) {
var texts [31]string
str := ""
all := ""
for i := 0; i < len(texts)-1; i++ {
texts[i] = str + "\n"
all += texts[i]
str += string(i%26 + 'a')
}
texts[len(texts)-1] = all
for h := 0; h < len(texts); h++ {
text := texts[h]
for i := 0; i < len(readMakers); i++ {
for j := 0; j < len(bufreaders); j++ {
for k := 0; k < len(bufsizes); k++ {
readmaker := readMakers[i]
bufreader := bufreaders[j]
bufsize := bufsizes[k]
read := readmaker.fn(bytes.NewBufferString(text))
buf, _ := NewReaderSize(read, bufsize)
s := bufreader.fn(buf)
if s != text {
t.Errorf("reader=%s fn=%s bufsize=%d want=%q got=%q",
readmaker.name, bufreader.name, bufsize, text, s)
}
}
}
}
}
}
// A StringReader delivers its data one string segment at a time via Read.
type StringReader struct {
data []string
step int
}
func (r *StringReader) Read(p []byte) (n int, err os.Error) {
if r.step < len(r.data) {
s := r.data[r.step]
n = copy(p, s)
r.step++
} else {
err = os.EOF
}
return
}
func readRuneSegments(t *testing.T, segments []string) {
got := ""
want := strings.Join(segments, "")
r := NewReader(&StringReader{data: segments})
for {
rune, _, err := r.ReadRune()
if err != nil {
if err != os.EOF {
return
}
break
}
got += string(rune)
}
if got != want {
t.Errorf("segments=%v got=%s want=%s", segments, got, want)
}
}
var segmentList = [][]string{
{},
{""},
{"日", "本語"},
{"\u65e5", "\u672c", "\u8a9e"},
{"\U000065e5", "\U0000672c", "\U00008a9e"},
{"\xe6", "\x97\xa5\xe6", "\x9c\xac\xe8\xaa\x9e"},
{"Hello", ", ", "World", "!"},
{"Hello", ", ", "", "World", "!"},
}
func TestReadRune(t *testing.T) {
for _, s := range segmentList {
readRuneSegments(t, s)
}
}
func TestUnreadRune(t *testing.T) {
got := ""
segments := []string{"Hello, world:", "日本語"}
data := strings.Join(segments, "")
r := NewReader(&StringReader{data: segments})
// Normal execution.
for {
rune, _, err := r.ReadRune()
if err != nil {
if err != os.EOF {
t.Error("unexpected EOF")
}
break
}
got += string(rune)
// Put it back and read it again
if err = r.UnreadRune(); err != nil {
t.Error("unexpected error on UnreadRune:", err)
}
rune1, _, err := r.ReadRune()
if err != nil {
t.Error("unexpected error reading after unreading:", err)
}
if rune != rune1 {
t.Errorf("incorrect rune after unread: got %c wanted %c", rune1, rune)
}
}
if got != data {
t.Errorf("want=%q got=%q", data, got)
}
}
// Test that UnreadRune fails if the preceding operation was not a ReadRune.
func TestUnreadRuneError(t *testing.T) {
buf := make([]byte, 3) // All runes in this test are 3 bytes long
r := NewReader(&StringReader{data: []string{"日本語日本語日本語"}})
if r.UnreadRune() == nil {
t.Error("expected error on UnreadRune from fresh buffer")
}
_, _, err := r.ReadRune()
if err != nil {
t.Error("unexpected error on ReadRune (1):", err)
}
if err = r.UnreadRune(); err != nil {
t.Error("unexpected error on UnreadRune (1):", err)
}
if r.UnreadRune() == nil {
t.Error("expected error after UnreadRune (1)")
}
// Test error after Read.
_, _, err = r.ReadRune() // reset state
if err != nil {
t.Error("unexpected error on ReadRune (2):", err)
}
_, err = r.Read(buf)
if err != nil {
t.Error("unexpected error on Read (2):", err)
}
if r.UnreadRune() == nil {
t.Error("expected error after Read (2)")
}
// Test error after ReadByte.
_, _, err = r.ReadRune() // reset state
if err != nil {
t.Error("unexpected error on ReadRune (2):", err)
}
for _ = range buf {
_, err = r.ReadByte()
if err != nil {
t.Error("unexpected error on ReadByte (2):", err)
}
}
if r.UnreadRune() == nil {
t.Error("expected error after ReadByte")
}
// Test error after UnreadByte.
_, _, err = r.ReadRune() // reset state
if err != nil {
t.Error("unexpected error on ReadRune (3):", err)
}
_, err = r.ReadByte()
if err != nil {
t.Error("unexpected error on ReadByte (3):", err)
}
err = r.UnreadByte()
if err != nil {
t.Error("unexpected error on UnreadByte (3):", err)
}
if r.UnreadRune() == nil {
t.Error("expected error after UnreadByte (3)")
}
}
func TestUnreadRuneAtEOF(t *testing.T) {
// UnreadRune/ReadRune should error at EOF (was a bug; used to panic)
r := NewReader(strings.NewReader("x"))
r.ReadRune()
r.ReadRune()
r.UnreadRune()
_, _, err := r.ReadRune()
if err == nil {
t.Error("expected error at EOF")
} else if err != os.EOF {
t.Error("expected EOF; got", err)
}
}
func TestReadWriteRune(t *testing.T) {
const NRune = 1000
byteBuf := new(bytes.Buffer)
w := NewWriter(byteBuf)
// Write the runes out using WriteRune
buf := make([]byte, utf8.UTFMax)
for rune := 0; rune < NRune; rune++ {
size := utf8.EncodeRune(buf, rune)
nbytes, err := w.WriteRune(rune)
if err != nil {
t.Fatalf("WriteRune(0x%x) error: %s", rune, err)
}
if nbytes != size {
t.Fatalf("WriteRune(0x%x) expected %d, got %d", rune, size, nbytes)
}
}
w.Flush()
r := NewReader(byteBuf)
// Read them back with ReadRune
for rune := 0; rune < NRune; rune++ {
size := utf8.EncodeRune(buf, rune)
nr, nbytes, err := r.ReadRune()
if nr != rune || nbytes != size || err != nil {
t.Fatalf("ReadRune(0x%x) got 0x%x,%d not 0x%x,%d (err=%s)", r, nr, nbytes, r, size, err)
}
}
}
func TestWriter(t *testing.T) {
var data [8192]byte
for i := 0; i < len(data); i++ {
data[i] = byte(' ' + i%('~'-' '))
}
w := new(bytes.Buffer)
for i := 0; i < len(bufsizes); i++ {
for j := 0; j < len(bufsizes); j++ {
nwrite := bufsizes[i]
bs := bufsizes[j]
// Write nwrite bytes using buffer size bs.
// Check that the right amount makes it out
// and that the data is correct.
w.Reset()
buf, e := NewWriterSize(w, bs)
context := fmt.Sprintf("nwrite=%d bufsize=%d", nwrite, bs)
if e != nil {
t.Errorf("%s: NewWriterSize %d: %v", context, bs, e)
continue
}
n, e1 := buf.Write(data[0:nwrite])
if e1 != nil || n != nwrite {
t.Errorf("%s: buf.Write %d = %d, %v", context, nwrite, n, e1)
continue
}
if e = buf.Flush(); e != nil {
t.Errorf("%s: buf.Flush = %v", context, e)
}
written := w.Bytes()
if len(written) != nwrite {
t.Errorf("%s: %d bytes written", context, len(written))
}
for l := 0; l < len(written); l++ {
if written[i] != data[i] {
t.Errorf("wrong bytes written")
t.Errorf("want=%q", data[0:len(written)])
t.Errorf("have=%q", written)
}
}
}
}
}
// Check that write errors are returned properly.
type errorWriterTest struct {
n, m int
err os.Error
expect os.Error
}
func (w errorWriterTest) Write(p []byte) (int, os.Error) {
return len(p) * w.n / w.m, w.err
}
var errorWriterTests = []errorWriterTest{
{0, 1, nil, io.ErrShortWrite},
{1, 2, nil, io.ErrShortWrite},
{1, 1, nil, nil},
{0, 1, os.EPIPE, os.EPIPE},
{1, 2, os.EPIPE, os.EPIPE},
{1, 1, os.EPIPE, os.EPIPE},
}
func TestWriteErrors(t *testing.T) {
for _, w := range errorWriterTests {
buf := NewWriter(w)
_, e := buf.Write([]byte("hello world"))
if e != nil {
t.Errorf("Write hello to %v: %v", w, e)
continue
}
e = buf.Flush()
if e != w.expect {
t.Errorf("Flush %v: got %v, wanted %v", w, e, w.expect)
}
}
}
func TestNewReaderSizeIdempotent(t *testing.T) {
const BufSize = 1000
b, err := NewReaderSize(bytes.NewBufferString("hello world"), BufSize)
if err != nil {
t.Error("NewReaderSize create fail", err)
}
// Does it recognize itself?
b1, err2 := NewReaderSize(b, BufSize)
if err2 != nil {
t.Error("NewReaderSize #2 create fail", err2)
}
if b1 != b {
t.Error("NewReaderSize did not detect underlying Reader")
}
// Does it wrap if existing buffer is too small?
b2, err3 := NewReaderSize(b, 2*BufSize)
if err3 != nil {
t.Error("NewReaderSize #3 create fail", err3)
}
if b2 == b {
t.Error("NewReaderSize did not enlarge buffer")
}
}
func TestNewWriterSizeIdempotent(t *testing.T) {
const BufSize = 1000
b, err := NewWriterSize(new(bytes.Buffer), BufSize)
if err != nil {
t.Error("NewWriterSize create fail", err)
}
// Does it recognize itself?
b1, err2 := NewWriterSize(b, BufSize)
if err2 != nil {
t.Error("NewWriterSize #2 create fail", err2)
}
if b1 != b {
t.Error("NewWriterSize did not detect underlying Writer")
}
// Does it wrap if existing buffer is too small?
b2, err3 := NewWriterSize(b, 2*BufSize)
if err3 != nil {
t.Error("NewWriterSize #3 create fail", err3)
}
if b2 == b {
t.Error("NewWriterSize did not enlarge buffer")
}
}
func TestWriteString(t *testing.T) {
const BufSize = 8
buf := new(bytes.Buffer)
b, err := NewWriterSize(buf, BufSize)
if err != nil {
t.Error("NewWriterSize create fail", err)
}
b.WriteString("0") // easy
b.WriteString("123456") // still easy
b.WriteString("7890") // easy after flush
b.WriteString("abcdefghijklmnopqrstuvwxy") // hard
b.WriteString("z")
b.Flush()
if b.err != nil {
t.Error("WriteString", b.err)
}
s := "01234567890abcdefghijklmnopqrstuvwxyz"
if string(buf.Bytes()) != s {
t.Errorf("WriteString wants %q gets %q", s, string(buf.Bytes()))
}
}
func TestBufferFull(t *testing.T) {
buf, _ := NewReaderSize(strings.NewReader("hello, world"), 5)
line, err := buf.ReadSlice(',')
if string(line) != "hello" || err != ErrBufferFull {
t.Errorf("first ReadSlice(,) = %q, %v", line, err)
}
line, err = buf.ReadSlice(',')
if string(line) != "," || err != nil {
t.Errorf("second ReadSlice(,) = %q, %v", line, err)
}
}
func TestPeek(t *testing.T) {
p := make([]byte, 10)
buf, _ := NewReaderSize(strings.NewReader("abcdefghij"), 4)
if s, err := buf.Peek(1); string(s) != "a" || err != nil {
t.Fatalf("want %q got %q, err=%v", "a", string(s), err)
}
if s, err := buf.Peek(4); string(s) != "abcd" || err != nil {
t.Fatalf("want %q got %q, err=%v", "abcd", string(s), err)
}
if _, err := buf.Peek(5); err != ErrBufferFull {
t.Fatalf("want ErrBufFull got %v", err)
}
if _, err := buf.Read(p[0:3]); string(p[0:3]) != "abc" || err != nil {
t.Fatalf("want %q got %q, err=%v", "abc", string(p[0:3]), err)
}
if s, err := buf.Peek(1); string(s) != "d" || err != nil {
t.Fatalf("want %q got %q, err=%v", "d", string(s), err)
}
if s, err := buf.Peek(2); string(s) != "de" || err != nil {
t.Fatalf("want %q got %q, err=%v", "de", string(s), err)
}
if _, err := buf.Read(p[0:3]); string(p[0:3]) != "def" || err != nil {
t.Fatalf("want %q got %q, err=%v", "def", string(p[0:3]), err)
}
if s, err := buf.Peek(4); string(s) != "ghij" || err != nil {
t.Fatalf("want %q got %q, err=%v", "ghij", string(s), err)
}
if _, err := buf.Read(p[0:4]); string(p[0:4]) != "ghij" || err != nil {
t.Fatalf("want %q got %q, err=%v", "ghij", string(p[0:3]), err)
}
if s, err := buf.Peek(0); string(s) != "" || err != nil {
t.Fatalf("want %q got %q, err=%v", "", string(s), err)
}
if _, err := buf.Peek(1); err != os.EOF {
t.Fatalf("want EOF got %v", err)
}
}
func TestPeekThenUnreadRune(t *testing.T) {
// This sequence used to cause a crash.
r := NewReader(strings.NewReader("x"))
r.ReadRune()
r.Peek(1)
r.UnreadRune()
r.ReadRune() // Used to panic here
}