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107 lines
3 KiB
Go
107 lines
3 KiB
Go
// Copyright 2019 The Hugo Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package hugio
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import (
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"bytes"
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"io"
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"strings"
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)
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// ReadSeeker wraps io.Reader and io.Seeker.
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type ReadSeeker interface {
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io.Reader
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io.Seeker
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}
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// ReadSeekCloser is implemented by afero.File. We use this as the common type for
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// content in Resource objects, even for strings.
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type ReadSeekCloser interface {
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ReadSeeker
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io.Closer
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}
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// ReadSeekCloserProvider provides a ReadSeekCloser.
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type ReadSeekCloserProvider interface {
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ReadSeekCloser() (ReadSeekCloser, error)
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}
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// readSeekerNopCloser implements ReadSeekCloser by doing nothing in Close.
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type readSeekerNopCloser struct {
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ReadSeeker
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}
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// Close does nothing.
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func (r readSeekerNopCloser) Close() error {
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return nil
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}
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// NewReadSeekerNoOpCloser creates a new ReadSeekerNoOpCloser with the given ReadSeeker.
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func NewReadSeekerNoOpCloser(r ReadSeeker) ReadSeekCloser {
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return readSeekerNopCloser{r}
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}
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// NewReadSeekerNoOpCloserFromString uses strings.NewReader to create a new ReadSeekerNoOpCloser
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// from the given string.
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func NewReadSeekerNoOpCloserFromString(content string) ReadSeekCloser {
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return stringReadSeeker{s: content, readSeekerNopCloser: readSeekerNopCloser{strings.NewReader(content)}}
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}
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var _ StringReader = (*stringReadSeeker)(nil)
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type stringReadSeeker struct {
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s string
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readSeekerNopCloser
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}
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func (s *stringReadSeeker) ReadString() string {
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return s.s
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}
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// StringReader provides a way to read a string.
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type StringReader interface {
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ReadString() string
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}
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// NewReadSeekerNoOpCloserFromString uses strings.NewReader to create a new ReadSeekerNoOpCloser
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// from the given bytes slice.
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func NewReadSeekerNoOpCloserFromBytes(content []byte) readSeekerNopCloser {
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return readSeekerNopCloser{bytes.NewReader(content)}
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}
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// NewReadSeekCloser creates a new ReadSeekCloser from the given ReadSeeker.
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// The ReadSeeker will be seeked to the beginning before returned.
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func NewOpenReadSeekCloser(r ReadSeekCloser) OpenReadSeekCloser {
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return func() (ReadSeekCloser, error) {
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r.Seek(0, io.SeekStart)
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return r, nil
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}
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}
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// OpenReadSeekCloser allows setting some other way (than reading from a filesystem)
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// to open or create a ReadSeekCloser.
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type OpenReadSeekCloser func() (ReadSeekCloser, error)
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// ReadString reads from the given reader and returns the content as a string.
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func ReadString(r io.Reader) (string, error) {
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if sr, ok := r.(StringReader); ok {
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return sr.ReadString(), nil
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}
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b, err := io.ReadAll(r)
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if err != nil {
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return "", err
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}
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return string(b), nil
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}
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