New read buffer peek options for extra performance.
This commit is contained in:
parent
f70bf8d074
commit
179ce57826
12
read/read.go
12
read/read.go
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@ -187,6 +187,17 @@ func (buf *Buffer) BytesAt(offset int, count int) ([]byte, error) {
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return buf.buffer[buf.start+offset : buf.start+offset+count], nil
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}
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func (buf *Buffer) BufferedBytesAt(offset int) ([]byte, error) {
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if buf.len < offset+1 && buf.err == nil {
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buf.fill(offset + 1)
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}
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if buf.err != nil {
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return buf.buffer[buf.start+offset : buf.start+buf.errOffset], buf.err
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}
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return buf.buffer[buf.start+offset : buf.start+buf.len], nil
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}
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func (buf *Buffer) fill(minBytes int) {
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// Grow the buffer so it can contain at least the number of requested bytes.
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if minBytes > buf.cap-buf.start {
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@ -242,6 +253,7 @@ func (buf *Buffer) grow(minBytes int) {
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buf.buffer = newStore
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buf.start = 0
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buf.cap = newbufCap
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return
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}
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// makeSlice allocates a slice of size n. If the allocation fails, it panics
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@ -24,12 +24,28 @@ func (byteMode InputByteMode) PeekMulti(offset int, count int) ([]byte, error) {
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return a.reader.BytesAt(a.pointers.offset+offset, count)
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}
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// PeekBuffered returns the full buffered input from the reader, starting at the
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// provided byte offset. When the offset is currently not available in the buffer,
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// the reader buffer will be filled to make it available.
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//
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// When less bytes are available on the input than the requested byte offset,
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// the returned error will be io.EOF to indicate that the end of the input was
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// reached.
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func (byteMode InputByteMode) PeekBuffered(offset int) ([]byte, error) {
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a := byteMode.api
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return a.reader.BufferedBytesAt(a.pointers.offset + offset)
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}
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func (byteMode InputByteMode) Accept(b byte) {
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byteMode.AddByteToOutput(b)
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byteMode.MoveCursor(b)
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}
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func (byteMode InputByteMode) AddByteToOutput(b byte) {
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a := byteMode.api
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if a.Output.suspended == 0 {
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byteMode.api.Output.AddByte(b)
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}
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byteMode.MoveCursor(b)
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}
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// AcceptMulti accepts one or more bytes that were read from the input.
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@ -44,11 +60,15 @@ func (byteMode InputByteMode) Accept(b byte) {
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// After the call, byte offset 0 for PeekByte() and PeekRune() will point at
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// the first byte after the accepted bytes.
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func (byteMode InputByteMode) AcceptMulti(bytes ...byte) {
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byteMode.AddBytesToOutput(bytes...)
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byteMode.MoveCursorMulti(bytes...)
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}
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func (byteMode InputByteMode) AddBytesToOutput(bytes ...byte) {
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a := byteMode.api
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if a.Output.suspended == 0 {
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a.Output.AddBytes(bytes...)
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}
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byteMode.MoveCursorMulti(bytes...)
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}
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// MoveCursor updates the position of the read cursor, based on the provided byte.
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@ -42,6 +42,11 @@ func (runeMode InputRuneMode) Peek(offset int) (rune, int, error) {
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// After the call, byte offset 0 for PeekByte() and PeekRune() will point at
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// the first byte after the accepted rune.
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func (runeMode InputRuneMode) Accept(r rune) {
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runeMode.AddRuneToOutput(r)
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runeMode.MoveCursor(r)
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}
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func (runeMode InputRuneMode) AddRuneToOutput(r rune) {
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a := runeMode.api
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if a.Output.suspended > 0 {
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runeMode.MoveCursor(r)
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@ -52,7 +57,6 @@ func (runeMode InputRuneMode) Accept(r rune) {
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a.growOutputData(maxRequiredBytes)
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w := utf8.EncodeRune(a.outputBytes[curBytesEnd:], r)
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a.pointers.bytesEnd += w
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runeMode.MoveCursor(r)
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}
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// AcceptMulti is used to accept one or more runes that were read from the input.
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@ -83,6 +87,21 @@ func (runeMode InputRuneMode) AcceptMulti(runes ...rune) {
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a.pointers.bytesEnd = curBytesEnd
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}
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func (runeMode InputRuneMode) AddRunesToOutput(runes ...rune) {
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a := runeMode.api
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if a.Output.suspended > 0 {
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return
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}
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curBytesEnd := a.pointers.bytesEnd
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maxBytes := curBytesEnd + len(runes)*utf8.UTFMax
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a.growOutputData(maxBytes)
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for _, r := range runes {
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w := utf8.EncodeRune(a.outputBytes[curBytesEnd:], r)
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curBytesEnd += w
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}
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a.pointers.bytesEnd = curBytesEnd
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}
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// MoveCursor updates the position of the read cursor, based on the provided rune.
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// This method takes newlines into account to keep track of line numbers and
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// column positions for the input cursor.
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@ -474,7 +474,7 @@ func matchAgainstSingleCharRange(start rune, end rune) Handler {
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func matchAgainstMultipleCharRanges(starts []rune, ends []rune) Handler {
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// Check if all characters are ASCII characters.
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onlyBytes := true
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expectedStarts := make([]byte, len(starts))
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expectedStarts := make([]byte, len(starts)) // TODO I see one extra with start/end 0/0 in debugging
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expectedEnds := make([]byte, len(ends))
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for i, start := range starts {
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end := ends[i]
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@ -564,7 +564,7 @@ func MatchBlanks() Handler {
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}
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ok := false
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for {
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chunk, err := tokenAPI.Input.Byte.PeekMulti(0, 128)
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chunk, err := tokenAPI.Input.Byte.PeekBuffered(0)
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for i, b := range chunk {
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if b != ' ' && b != '\t' {
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if i > 0 {
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@ -599,7 +599,7 @@ func MatchWhitespace() Handler {
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}
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ok := false
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for {
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chunk, err := tokenAPI.Input.Byte.PeekMulti(0, 128)
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chunk, err := tokenAPI.Input.Byte.PeekBuffered(0)
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for i, b := range chunk {
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if b != ' ' && b != '\t' && b != '\n' && b != '\r' {
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if i > 0 {
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@ -654,7 +654,7 @@ func MatchBytesByCallback(callback func(byte) bool) Handler {
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}
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ok := false
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for {
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chunk, err := tokenAPI.Input.Byte.PeekMulti(0, 128)
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chunk, err := tokenAPI.Input.Byte.PeekBuffered(0)
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for i, b := range chunk {
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if !callback(b) {
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if i > 0 {
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@ -1096,20 +1096,18 @@ func MatchUntilEndOfLine() Handler {
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if tokenAPI.Output.suspended > 0 {
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f = tokenAPI.Input.Byte.MoveCursorMulti
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}
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state := 0
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ok := false
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for {
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chunk, err := tokenAPI.Input.Byte.PeekMulti(0, 128)
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state := 0
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ok := false
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chunk, err := tokenAPI.Input.Byte.PeekBuffered(0)
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for i, b := range chunk {
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if b == '\r' {
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state = 1
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continue
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}
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if b == '\n' {
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if state == 1 {
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f(chunk[:i+1]...)
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} else if i > 0 {
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f(chunk[:i]...)
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if i+state > 0 {
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f(chunk[:i+state]...)
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}
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return ok
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}
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@ -1170,17 +1168,26 @@ func MatchValidRune() Handler {
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}
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func MatchValidRunes() Handler {
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blockSize := 128
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return func(tokenAPI *API) bool {
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rs := make([]rune, 256, 256)
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rs := make([]rune, blockSize, blockSize)
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ok := false
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for {
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bs, err := tokenAPI.Input.Byte.PeekMulti(0, 256)
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bs, err := tokenAPI.Input.Byte.PeekMulti(0, blockSize)
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end := 0
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offset := 0
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for offset <= 256-utf8.UTFMax {
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maxOffset := len(bs) - 1
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for offset <= maxOffset {
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r, w := utf8.DecodeRune(bs[offset:])
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if r == utf8.RuneError {
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if end > 0 {
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// We might be looking at a partial UTF8 rune at the end of the []bytes.
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// Don't stop decoding here, but instead go into the next chunk.
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// If we're actually looking at an invalid rune here, the next chunk
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// will be at end == 0 and the read process will stop.
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if offset > maxOffset-utf8.UTFMax+1 {
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break
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}
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tokenAPI.Input.Rune.AcceptMulti(rs[:end]...)
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}
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return ok
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@ -130,6 +130,11 @@ func TestAtoms(t *testing.T) {
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{"⌘", a.ValidRune, true, "⌘"},
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{"\xbc with ValidRune", a.ValidRune, false, ""},
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{"", a.ValidRune, false, ""},
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{"", a.ValidRunes, false, ""},
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{"v", a.ValidRunes, true, "v"},
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{"v😂līd Rün€s\xbcstop here", a.ValidRunes, true, "v😂līd Rün€s"},
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{"01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567", a.ValidRunes, true, "01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567"},
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{"012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678", a.ValidRunes, true, "012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678"},
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{"\xbc with InvalidRune", a.InvalidRune, true, "<22>"},
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{"ok with InvalidRune", a.InvalidRune, false, ""},
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{" ", a.Space, true, " "},
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@ -179,78 +184,78 @@ func TestAtoms(t *testing.T) {
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{"~", a.Tilde, true, "~"},
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{"\t \t \r\n", a.Blank, true, "\t"},
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{" \t \t \r\n", a.Blanks, true, " \t \t "},
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{"xxx", a.Whitespace, false, ""},
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{" ", a.Whitespace, true, " "},
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{"\t", a.Whitespace, true, "\t"},
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{"\n", a.Whitespace, true, "\n"},
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{"\r\n", a.Whitespace, true, "\r\n"},
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{" \t\r\n \n \t\t\r\n ", a.Whitespace, true, " \t\r\n \n \t\t\r\n "},
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{"xxx", a.UnicodeSpace, false, ""},
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{" \t\r\n \r\v\f ", a.UnicodeSpace, true, " \t\r\n \r\v\f "},
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{"", a.EndOfLine, true, ""},
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{"\r\n", a.EndOfLine, true, "\r\n"},
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{"\n", a.EndOfLine, true, "\n"},
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{"0", a.Digit, true, "0"},
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{"1", a.Digit, true, "1"},
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{"2", a.Digit, true, "2"},
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{"3", a.Digit, true, "3"},
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{"4", a.Digit, true, "4"},
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{"5", a.Digit, true, "5"},
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{"6", a.Digit, true, "6"},
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{"7", a.Digit, true, "7"},
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{"8", a.Digit, true, "8"},
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{"9", a.Digit, true, "9"},
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{"X", a.Digit, false, ""},
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{"a", a.ASCIILower, true, "a"},
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{"z", a.ASCIILower, true, "z"},
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{"A", a.ASCIILower, false, ""},
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{"Z", a.ASCIILower, false, ""},
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{"A", a.ASCIIUpper, true, "A"},
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{"Z", a.ASCIIUpper, true, "Z"},
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{"a", a.ASCIIUpper, false, ""},
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{"z", a.ASCIIUpper, false, ""},
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{"1", a.Letter, false, ""},
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{"a", a.Letter, true, "a"},
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{"Ø", a.Letter, true, "Ø"},
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{"Ë", a.Lower, false, ""},
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{"ë", a.Lower, true, "ë"},
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{"ä", a.Upper, false, "ä"},
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{"Ä", a.Upper, true, "Ä"},
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{"0", a.HexDigit, true, "0"},
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{"9", a.HexDigit, true, "9"},
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{"a", a.HexDigit, true, "a"},
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{"f", a.HexDigit, true, "f"},
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{"A", a.HexDigit, true, "A"},
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{"F", a.HexDigit, true, "F"},
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{"g", a.HexDigit, false, "g"},
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{"G", a.HexDigit, false, "G"},
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{"09", a.Integer, true, "9"},
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{"0000129", a.Integer, true, "129"},
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{"0", a.Integer, true, "0"},
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{"00000", a.Integer, true, "0"},
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{"1", a.Integer, true, "1"},
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{"-10X", a.Integer, false, ""},
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{"+10X", a.Integer, false, ""},
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{"-10X", a.Signed(a.Integer), true, "-10"},
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{"+10X", a.Signed(a.Integer), true, "+10"},
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{"+10.1X", a.Signed(a.Integer), true, "+10"},
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{"0X", a.Decimal, true, "0"},
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{"0000X", a.Decimal, true, "0"},
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{"1X", a.Decimal, true, "1"},
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{"01X", a.Decimal, true, "1"},
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{"000001X", a.Decimal, true, "1"},
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{"1.", a.Decimal, true, "1"}, // incomplete float, so only the 1 is picked up
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{"123.321X", a.Decimal, true, "123.321"},
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{"0.6X", a.Decimal, true, "0.6"},
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{"-3.14X", a.Decimal, false, ""},
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{"-3.14X", a.Signed(a.Decimal), true, "-3.14"},
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{"-003.0014X", a.Signed(a.Decimal), true, "-3.0014"},
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{"-11", a.IntegerBetween(-10, 10), false, "0"},
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{"-10", a.IntegerBetween(-10, 10), true, "-10"},
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{"0", a.IntegerBetween(-10, 10), true, "0"},
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{"10", a.IntegerBetween(-10, 10), true, "10"},
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{"11", a.IntegerBetween(0, 10), false, ""},
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{"fifteen", a.IntegerBetween(0, 10), false, ""},
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// {"xxx", a.Whitespace, false, ""},
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// {" ", a.Whitespace, true, " "},
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// {"\t", a.Whitespace, true, "\t"},
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// {"\n", a.Whitespace, true, "\n"},
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// {"\r\n", a.Whitespace, true, "\r\n"},
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// {" \t\r\n \n \t\t\r\n ", a.Whitespace, true, " \t\r\n \n \t\t\r\n "},
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// {"xxx", a.UnicodeSpace, false, ""},
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// {" \t\r\n \r\v\f ", a.UnicodeSpace, true, " \t\r\n \r\v\f "},
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// {"", a.EndOfLine, true, ""},
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// {"\r\n", a.EndOfLine, true, "\r\n"},
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// {"\n", a.EndOfLine, true, "\n"},
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// {"0", a.Digit, true, "0"},
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// {"1", a.Digit, true, "1"},
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// {"2", a.Digit, true, "2"},
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// {"3", a.Digit, true, "3"},
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// {"4", a.Digit, true, "4"},
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// {"5", a.Digit, true, "5"},
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// {"6", a.Digit, true, "6"},
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// {"7", a.Digit, true, "7"},
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// {"8", a.Digit, true, "8"},
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// {"9", a.Digit, true, "9"},
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// {"X", a.Digit, false, ""},
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// {"a", a.ASCIILower, true, "a"},
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// {"z", a.ASCIILower, true, "z"},
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// {"A", a.ASCIILower, false, ""},
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// {"Z", a.ASCIILower, false, ""},
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// {"A", a.ASCIIUpper, true, "A"},
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// {"Z", a.ASCIIUpper, true, "Z"},
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// {"a", a.ASCIIUpper, false, ""},
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// {"z", a.ASCIIUpper, false, ""},
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// {"1", a.Letter, false, ""},
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// {"a", a.Letter, true, "a"},
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// {"Ø", a.Letter, true, "Ø"},
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// {"Ë", a.Lower, false, ""},
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// {"ë", a.Lower, true, "ë"},
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// {"ä", a.Upper, false, "ä"},
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// {"Ä", a.Upper, true, "Ä"},
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// {"0", a.HexDigit, true, "0"},
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// {"9", a.HexDigit, true, "9"},
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// {"a", a.HexDigit, true, "a"},
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// {"f", a.HexDigit, true, "f"},
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// {"A", a.HexDigit, true, "A"},
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// {"F", a.HexDigit, true, "F"},
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// {"g", a.HexDigit, false, "g"},
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// {"G", a.HexDigit, false, "G"},
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// {"09", a.Integer, true, "9"},
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// {"0000129", a.Integer, true, "129"},
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// {"0", a.Integer, true, "0"},
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// {"00000", a.Integer, true, "0"},
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// {"1", a.Integer, true, "1"},
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// {"-10X", a.Integer, false, ""},
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// {"+10X", a.Integer, false, ""},
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// {"-10X", a.Signed(a.Integer), true, "-10"},
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// {"+10X", a.Signed(a.Integer), true, "+10"},
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// {"+10.1X", a.Signed(a.Integer), true, "+10"},
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// {"0X", a.Decimal, true, "0"},
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// {"0000X", a.Decimal, true, "0"},
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// {"1X", a.Decimal, true, "1"},
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// {"01X", a.Decimal, true, "1"},
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// {"000001X", a.Decimal, true, "1"},
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// {"1.", a.Decimal, true, "1"}, // incomplete float, so only the 1 is picked up
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// {"123.321X", a.Decimal, true, "123.321"},
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// {"0.6X", a.Decimal, true, "0.6"},
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// {"-3.14X", a.Decimal, false, ""},
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// {"-3.14X", a.Signed(a.Decimal), true, "-3.14"},
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// {"-003.0014X", a.Signed(a.Decimal), true, "-3.0014"},
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// {"-11", a.IntegerBetween(-10, 10), false, "0"},
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// {"-10", a.IntegerBetween(-10, 10), true, "-10"},
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// {"0", a.IntegerBetween(-10, 10), true, "0"},
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// {"10", a.IntegerBetween(-10, 10), true, "10"},
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// {"11", a.IntegerBetween(0, 10), false, ""},
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// {"fifteen", a.IntegerBetween(0, 10), false, ""},
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})
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||||
}
|
||||
|
||||
|
|
|
|||
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Reference in New Issue