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// Copyright 2010 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 line
import (
"bytes"
"io"
"io/ioutil"
"os"
"testing"
)
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 os.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 = os.EOF
}
return
}
func testLineReader(t *testing.T, input []byte) {
for stride := 1; stride < len(input); stride++ {
done := 0
reader := testReader{input, stride}
l := NewReader(&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 != os.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.Error("ReadLine didn't return everything")
}
}
}
func TestReader(t *testing.T) {
testLineReader(t, testInput)
testLineReader(t, testInputrn)
}
func TestLineTooLong(t *testing.T) {
buf := bytes.NewBuffer([]byte("aaabbbcc\n"))
l := NewReader(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)
}
}
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 := NewReader(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 := NewReader(bytes.NewBuffer(nil), 10)
line, isPrefix, err := l.ReadLine()
if err != os.EOF {
t.Errorf("expected EOF from ReadLine, got '%s' %t %s", line, isPrefix, err)
}
}
func TestLinesAfterRead(t *testing.T) {
l := NewReader(bytes.NewBuffer([]byte("foo")), 10)
_, err := ioutil.ReadAll(l)
if err != nil {
t.Error(err)
return
}
line, isPrefix, err := l.ReadLine()
if err != os.EOF {
t.Errorf("expected EOF from ReadLine, got '%s' %t %s", line, isPrefix, err)
}
}
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