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strings: complete documentation of strings.Reader

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There is no documentation on a number of methods of the strings.Reader
struct, so this change adds documentation referring to the relevant
io.* interfaces implemented. This is consistent with pre-existing
documentation in this struct.

Fixes #40381

Change-Id: I3dec65ecafca5b79d85d30a676d297e5ee9ab47e
GitHub-Last-Rev: f42429946a
GitHub-Pull-Request: golang/go#40654
Reviewed-on: https://go-review.googlesource.com/c/go/+/247523
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
Trust: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Norman B. Lancaster 2020-10-01 19:14:04 +00:00 committed by Robert Griesemer
parent f588974a52
commit 01efc9a3c5
1 changed files with 6 additions and 0 deletions
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6
src/strings/reader.go
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@ -35,6 +35,7 @@ func (r *Reader) Len() int {
// to any other method.
func (r *Reader) Size() int64 { return int64(len(r.s)) }
// Read implements the io.Reader interface.
func (r *Reader) Read(b []byte) (n int, err error) {
if r.i >= int64(len(r.s)) {
return 0, io.EOF
@ -45,6 +46,7 @@ func (r *Reader) Read(b []byte) (n int, err error) {
return
}
// ReadAt implements the io.ReaderAt interface.
func (r *Reader) ReadAt(b []byte, off int64) (n int, err error) {
// cannot modify state - see io.ReaderAt
if off < 0 {
@ -60,6 +62,7 @@ func (r *Reader) ReadAt(b []byte, off int64) (n int, err error) {
return
}
// ReadByte implements the io.ByteReader interface.
func (r *Reader) ReadByte() (byte, error) {
r.prevRune = -1
if r.i >= int64(len(r.s)) {
@ -70,6 +73,7 @@ func (r *Reader) ReadByte() (byte, error) {
return b, nil
}
// UnreadByte implements the io.ByteScanner interface.
func (r *Reader) UnreadByte() error {
if r.i <= 0 {
return errors.New("strings.Reader.UnreadByte: at beginning of string")
@ -79,6 +83,7 @@ func (r *Reader) UnreadByte() error {
return nil
}
// ReadRune implements the io.RuneReader interface.
func (r *Reader) ReadRune() (ch rune, size int, err error) {
if r.i >= int64(len(r.s)) {
r.prevRune = -1
@ -94,6 +99,7 @@ func (r *Reader) ReadRune() (ch rune, size int, err error) {
return
}
// UnreadRune implements the io.RuneScanner interface.
func (r *Reader) UnreadRune() error {
if r.i <= 0 {
return errors.New("strings.Reader.UnreadRune: at beginning of string")