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Other than the error conditions listed // here, implementations are free to report other errors that arise. If both conditions apply, then // either error may be returned. ErrShortSrc means that src had insufficient data // to complete the transformation. // ErrShortDst means that dst was too short to receive all of the // transformed bytes. If err is nil then nSrc must equal len(src) // the converse is not necessarily true. A nil error can be returned regardless of // whether atEOF is true. // A nil error means that all of the transformed bytes (whether freshly // transformed from src or left over from previous Transform calls) // were written to dst. // Callers should always process the nDst bytes produced and account // for the nSrc bytes consumed before considering the error err. The // atEOF argument tells whether src represents the last bytes of the // input. Transform writes to dst the transformed bytes read from src, and // returns the number of dst bytes written and src bytes read. That determines how much of the input already conforms to the Transformer. SpanningTransformer extends the Transformer interface with a Span method Span(src byte, atEOF bool) (n int, err error) Calls to Span and Transform may be // interleaved. This is obviously more // limited than calling Transform, but can be more efficient in terms of // copying and allocating buffers. In // effect, it does the transformation just as calling Transform would, only // without copying to a destination buffer and only up to a point it can // determine the input and output bytes are the same.
// Calling Span can modify the Transformer state as a side effect. ErrShortSrc means that src had insufficient data to determine whether the // remaining bytes would change.
Note that n may be len(src), meaning that the output // would contain additional bytes after otherwise identical output. // ErrEndOfSpan means that the Transformer output may differ from the // input after n bytes. If err is nil, then n must // equal len(src) the converse is not necessarily true. A nil error can be returned // regardless of whether atEOF is true. // A nil error means that all input bytes are known to be identical to the // output produced by the Transformer. // Callers should always account for the n bytes consumed before // considering the error err. The atEOF argument tells whether src represents the // last bytes of the input. It does not necessarily return // the largest such n. Transformer // Span returns a position in src such that transforming src results in // identical output src for these bytes. func (w *Writer) Write(data byte) (n int, err error).func NewWriter(w io.Writer, t Transformer) *Writer.func RemoveFunc(f func(r rune) bool) Transformer deprecated.func (r *Reader) Read(p byte) (int, error).
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