2009-10-12 11:09:35 -06:00
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package strings
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import "os"
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// A Reader satisfies calls to Read and ReadByte by
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// reading from a string.
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type Reader string
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func (r *Reader) Read(b []byte) (n int, err os.Error) {
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2009-12-15 16:40:16 -07:00
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s := *r
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2009-10-12 11:09:35 -06:00
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if len(s) == 0 {
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2009-11-09 13:07:39 -07:00
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return 0, os.EOF
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2009-10-12 11:09:35 -06:00
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}
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for n < len(s) && n < len(b) {
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2009-12-15 16:40:16 -07:00
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b[n] = s[n]
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n++
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2009-10-12 11:09:35 -06:00
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}
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2009-12-15 16:40:16 -07:00
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*r = s[n:]
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return
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2009-10-12 11:09:35 -06:00
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}
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func (r *Reader) ReadByte() (b byte, err os.Error) {
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2009-12-15 16:40:16 -07:00
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s := *r
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2009-10-12 11:09:35 -06:00
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if len(s) == 0 {
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2009-11-09 13:07:39 -07:00
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return 0, os.EOF
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2009-10-12 11:09:35 -06:00
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}
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2009-12-15 16:40:16 -07:00
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b = s[0]
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*r = s[1:]
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return
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2009-10-12 11:09:35 -06:00
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}
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// NewReader returns a new Reader reading from s.
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// It is similar to bytes.NewBufferString but more efficient and read-only.
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2009-12-15 16:40:16 -07:00
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func NewReader(s string) *Reader { return (*Reader)(&s) }
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