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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_test
import (
. "bufio"
"bytes"
"fmt"
"io"
"io/ioutil"
"os"
"strings"
"testing"
"testing/iotest"
"unicode/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, 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 == io.EOF {
break
}
if e == nil {
b[nb] = c
nb++
} else if e != iotest.ErrTimeout {
panic("Data: " + e.Error())
}
}
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},
{"timeout", iotest.TimeoutReader},
}
// 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 == io.EOF {
break
}
if e != nil && e != iotest.ErrTimeout {
panic("GetLines: " + e.Error())
}
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 == io.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{
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 error) {
if r.step < len(r.data) {
s := r.data[r.step]
n = copy(p, s)
r.step++
} else {
err = io.EOF
}
return
}
func readRuneSegments(t *testing.T, segments []string) {
got := ""
want := strings.Join(segments, "")
r := NewReader(&StringReader{data: segments})
for {
r, _, err := r.ReadRune()
if err != nil {
if err != io.EOF {
return
}
break
}
got += string(r)
}
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 {
r1, _, err := r.ReadRune()
if err != nil {
if err != io.EOF {
t.Error("unexpected EOF")
}
break
}
got += string(r1)
// Put it back and read it again
if err = r.UnreadRune(); err != nil {
t.Error("unexpected error on UnreadRune:", err)
}
r2, _, err := r.ReadRune()
if err != nil {
t.Error("unexpected error reading after unreading:", err)
}
if r1 != r2 {
t.Errorf("incorrect rune after unread: got %c wanted %c", r1, r2)
}
}
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 != io.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 r := rune(0); r < NRune; r++ {
size := utf8.EncodeRune(buf, r)
nbytes, err := w.WriteRune(r)
if err != nil {
t.Fatalf("WriteRune(0x%x) error: %s", r, err)
}
if nbytes != size {
t.Fatalf("WriteRune(0x%x) expected %d, got %d", r, size, nbytes)
}
}
w.Flush()
r := NewReader(byteBuf)
// Read them back with ReadRune
for r1 := rune(0); r1 < NRune; r1++ {
size := utf8.EncodeRune(buf, r1)
nr, nbytes, err := r.ReadRune()
if nr != r1 || nbytes != size || err != nil {
t.Fatalf("ReadRune(0x%x) got 0x%x,%d not 0x%x,%d (err=%s)", r1, nr, nbytes, r1, 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 error
expect error
}
func (w errorWriterTest) Write(p []byte) (int, 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")
if err := b.Flush(); err != nil {
t.Error("WriteString", 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 != io.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
}
var testOutput = []byte("0123456789abcdefghijklmnopqrstuvwxy")
var testInput = []byte("012\n345\n678\n9ab\ncde\nfgh\nijk\nlmn\nopq\nrst\nuvw\nxy")
var testInputrn = []byte("012\r\n345\r\n678\r\n9ab\r\ncde\r\nfgh\r\nijk\r\nlmn\r\nopq\r\nrst\r\nuvw\r\nxy\r\n\n\r\n")
// TestReader wraps a []byte and returns reads of a specific length.
type testReader struct {
data []byte
stride int
}
func (t *testReader) Read(buf []byte) (n int, err error) {
n = t.stride
if n > len(t.data) {
n = len(t.data)
}
if n > len(buf) {
n = len(buf)
}
copy(buf, t.data)
t.data = t.data[n:]
if len(t.data) == 0 {
err = io.EOF
}
return
}
func testReadLine(t *testing.T, input []byte) {
//for stride := 1; stride < len(input); stride++ {
for stride := 1; stride < 2; stride++ {
done := 0
reader := testReader{input, stride}
l, _ := NewReaderSize(&reader, len(input)+1)
for {
line, isPrefix, err := l.ReadLine()
if len(line) > 0 && err != nil {
t.Errorf("ReadLine returned both data and error: %s", err)
}
if isPrefix {
t.Errorf("ReadLine returned prefix")
}
if err != nil {
if err != io.EOF {
t.Fatalf("Got unknown error: %s", err)
}
break
}
if want := testOutput[done : done+len(line)]; !bytes.Equal(want, line) {
t.Errorf("Bad line at stride %d: want: %x got: %x", stride, want, line)
}
done += len(line)
}
if done != len(testOutput) {
t.Errorf("ReadLine didn't return everything: got: %d, want: %d (stride: %d)", done, len(testOutput), stride)
}
}
}
func TestReadLine(t *testing.T) {
testReadLine(t, testInput)
testReadLine(t, testInputrn)
}
func TestLineTooLong(t *testing.T) {
buf := bytes.NewBuffer([]byte("aaabbbcc\n"))
l, _ := NewReaderSize(buf, 3)
line, isPrefix, err := l.ReadLine()
if !isPrefix || !bytes.Equal(line, []byte("aaa")) || err != nil {
t.Errorf("bad result for first line: %x %s", line, err)
}
line, isPrefix, err = l.ReadLine()
if !isPrefix || !bytes.Equal(line, []byte("bbb")) || err != nil {
t.Errorf("bad result for second line: %x", line)
}
line, isPrefix, err = l.ReadLine()
if isPrefix || !bytes.Equal(line, []byte("cc")) || err != nil {
t.Errorf("bad result for third line: %x", line)
}
line, isPrefix, err = l.ReadLine()
if isPrefix || err == nil {
t.Errorf("expected no more lines: %x %s", line, err)
}
}
func TestReadAfterLines(t *testing.T) {
line1 := "line1"
restData := "line2\nline 3\n"
inbuf := bytes.NewBuffer([]byte(line1 + "\n" + restData))
outbuf := new(bytes.Buffer)
maxLineLength := len(line1) + len(restData)/2
l, _ := NewReaderSize(inbuf, maxLineLength)
line, isPrefix, err := l.ReadLine()
if isPrefix || err != nil || string(line) != line1 {
t.Errorf("bad result for first line: isPrefix=%v err=%v line=%q", isPrefix, err, string(line))
}
n, err := io.Copy(outbuf, l)
if int(n) != len(restData) || err != nil {
t.Errorf("bad result for Read: n=%d err=%v", n, err)
}
if outbuf.String() != restData {
t.Errorf("bad result for Read: got %q; expected %q", outbuf.String(), restData)
}
}
func TestReadEmptyBuffer(t *testing.T) {
l, _ := NewReaderSize(bytes.NewBuffer(nil), 10)
line, isPrefix, err := l.ReadLine()
if err != io.EOF {
t.Errorf("expected EOF from ReadLine, got '%s' %t %s", line, isPrefix, err)
}
}
func TestLinesAfterRead(t *testing.T) {
l, _ := NewReaderSize(bytes.NewBuffer([]byte("foo")), 10)
_, err := ioutil.ReadAll(l)
if err != nil {
t.Error(err)
return
}
line, isPrefix, err := l.ReadLine()
if err != io.EOF {
t.Errorf("expected EOF from ReadLine, got '%s' %t %s", line, isPrefix, err)
}
}
func TestReadLineNonNilLineOrError(t *testing.T) {
r := NewReader(strings.NewReader("line 1\n"))
for i := 0; i < 2; i++ {
l, _, err := r.ReadLine()
if l != nil && err != nil {
t.Fatalf("on line %d/2; ReadLine=%#v, %v; want non-nil line or Error, but not both",
i+1, l, err)
}
}
}
type readLineResult struct {
line []byte
isPrefix bool
err error
}
var readLineNewlinesTests = []struct {
input string
bufSize int
expect []readLineResult
}{
{"h\r\nb\r\n", 2, []readLineResult{
{[]byte("h"), true, nil},
{nil, false, nil},
{[]byte("b"), true, nil},
{nil, false, nil},
{nil, false, io.EOF},
}},
{"hello\r\nworld\r\n", 6, []readLineResult{
{[]byte("hello"), true, nil},
{nil, false, nil},
{[]byte("world"), true, nil},
{nil, false, nil},
{nil, false, io.EOF},
}},
{"hello\rworld\r", 6, []readLineResult{
{[]byte("hello"), true, nil},
{[]byte("\rworld"), true, nil},
{[]byte("\r"), false, nil},
{nil, false, io.EOF},
}},
{"h\ri\r\n\r", 2, []readLineResult{
{[]byte("h"), true, nil},
{[]byte("\ri"), true, nil},
{nil, false, nil},
{[]byte("\r"), false, nil},
{nil, false, io.EOF},
}},
}
func TestReadLineNewlines(t *testing.T) {
for _, e := range readLineNewlinesTests {
testReadLineNewlines(t, e.input, e.bufSize, e.expect)
}
}
func testReadLineNewlines(t *testing.T, input string, bufSize int, expect []readLineResult) {
b, err := NewReaderSize(strings.NewReader(input), bufSize)
if err != nil {
t.Fatal(err)
}
for i, e := range expect {
line, isPrefix, err := b.ReadLine()
if bytes.Compare(line, e.line) != 0 {
t.Errorf("%q call %d, line == %q, want %q", input, i, line, e.line)
return
}
if isPrefix != e.isPrefix {
t.Errorf("%q call %d, isPrefix == %v, want %v", input, i, isPrefix, e.isPrefix)
return
}
if err != e.err {
t.Errorf("%q call %d, err == %v, want %v", input, i, err, e.err)
return
}
}
}
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