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strings: complete documentation of strings.Reader
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>
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@ -35,6 +35,7 @@ func (r *Reader) Len() int {
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// to any other method.
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func (r *Reader) Size() int64 { return int64(len(r.s)) }
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// Read implements the io.Reader interface.
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func (r *Reader) Read(b []byte) (n int, err error) {
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if r.i >= int64(len(r.s)) {
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return 0, io.EOF
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@ -45,6 +46,7 @@ func (r *Reader) Read(b []byte) (n int, err error) {
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return
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}
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// ReadAt implements the io.ReaderAt interface.
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func (r *Reader) ReadAt(b []byte, off int64) (n int, err error) {
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// cannot modify state - see io.ReaderAt
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if off < 0 {
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@ -60,6 +62,7 @@ func (r *Reader) ReadAt(b []byte, off int64) (n int, err error) {
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return
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}
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// ReadByte implements the io.ByteReader interface.
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func (r *Reader) ReadByte() (byte, error) {
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r.prevRune = -1
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if r.i >= int64(len(r.s)) {
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@ -70,6 +73,7 @@ func (r *Reader) ReadByte() (byte, error) {
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return b, nil
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}
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// UnreadByte implements the io.ByteScanner interface.
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func (r *Reader) UnreadByte() error {
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if r.i <= 0 {
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return errors.New("strings.Reader.UnreadByte: at beginning of string")
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@ -79,6 +83,7 @@ func (r *Reader) UnreadByte() error {
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return nil
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}
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// ReadRune implements the io.RuneReader interface.
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func (r *Reader) ReadRune() (ch rune, size int, err error) {
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if r.i >= int64(len(r.s)) {
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r.prevRune = -1
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@ -94,6 +99,7 @@ func (r *Reader) ReadRune() (ch rune, size int, err error) {
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return
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}
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// UnreadRune implements the io.RuneScanner interface.
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func (r *Reader) UnreadRune() error {
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if r.i <= 0 {
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return errors.New("strings.Reader.UnreadRune: at beginning of string")
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