Documentation
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Overview ¶
Package readers contains implementations of useful decorators and adapters for readers
Index ¶
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
func NewReverseReader ¶
func NewReverseReader(readSeeker io.ReadSeeker) io.Reader
NewReverseReader() returns an implementation of the io.Reader interface that reads the passed io.ReadSeeker backwards.
Types ¶
type ByteScannerReader ¶
type ByteScannerReader interface {
io.ByteScanner
io.Reader
}
ByteScannerReader is a combination of io.ByteScanner and io.Reader. The UnreadByte() method is useful in lexical analyzers and so is io.Reader. None of the interfaces supplied with Go appear to have both of these methods.
type HistoryReader ¶
type HistoryReader struct {
// contains filtered or unexported fields
}
HistoryReader is a decorator for a ByteScannerReader interface that saves the history of the previous "n" reads in a circular buffer. It is useful, for example, with lexical scanners so that when an error occurs, the HistoryReader can provide the last "n" bytes leading up to the error.
func NewHistoryReader ¶
func NewHistoryReader(reader ByteScannerReader, capacity uint) *HistoryReader
NewHistoryReader() creates a new HistoryReader from a ByteScannerReader with a circular buffer of the requested capacity.
func (*HistoryReader) GetHistory ¶
func (d *HistoryReader) GetHistory() []byte
GetHistory() returns the contents of the circular history buffer. It is the only method added to HistoryReader that distinguishes it from ByteScannerReader.
func (*HistoryReader) ReadByte ¶
func (d *HistoryReader) ReadByte() (b byte, err error)
func (*HistoryReader) UnreadByte ¶
func (d *HistoryReader) UnreadByte() (err error)
type ReverseReader ¶
type ReverseReader struct {
// contains filtered or unexported fields
}
ReverseReader implements an io.Reader interface on an underlying io.ReadSeeker to read it backwards.
Source Files