Package bytes
import "bytes"
The bytes package implements functions for the manipulation of byte slices. Analagous to the facilities of the strings package.
Package files
buffer.go bytes.go bytes_decl.goConstants
MinRead is the minimum slice size passed to a Read call by Buffer.ReadFrom. As long as the Buffer has at least MinRead bytes beyond what is required to hold the contents of r, ReadFrom will not grow the underlying buffer.
const MinRead = 512
func Add
func Add(s, t []byte) []byte
Add appends the contents of t to the end of s and returns the result. If s has enough capacity, it is extended in place; otherwise a new array is allocated and returned.
func AddByte
func AddByte(s []byte, t byte) []byte
AddByte appends byte b to the end of s and returns the result. If s has enough capacity, it is extended in place; otherwise a new array is allocated and returned.
func Compare
func Compare(a, b []byte) int
Compare returns an integer comparing the two byte arrays lexicographically. The result will be 0 if a==b, -1 if a < b, and +1 if a > b
func Count
func Count(s, sep []byte) int
Count counts the number of non-overlapping instances of sep in s.
func Equal
func Equal(a, b []byte) bool
Equal returns a boolean reporting whether a == b.
func Fields
func Fields(s []byte) [][]byte
Fields splits the array s around each instance of one or more consecutive white space characters, returning a slice of subarrays of s or an empty list if s contains only white space.
func HasPrefix
func HasPrefix(s, prefix []byte) bool
HasPrefix tests whether the byte array s begins with prefix.
func HasSuffix
func HasSuffix(s, suffix []byte) bool
HasSuffix tests whether the byte array s ends with suffix.
func Index
func Index(s, sep []byte) int
Index returns the index of the first instance of sep in s, or -1 if sep is not present in s.
func IndexAny
func IndexAny(s []byte, chars string) int
IndexAny interprets s as a sequence of UTF-8 encoded Unicode code points. It returns the byte index of the first occurrence in s of any of the Unicode code points in chars. It returns -1 if chars is empty or if there is no code point in common.
func IndexByte
func IndexByte(s []byte, c byte) int
IndexByte returns the index of the first instance of c in s, or -1 if c is not present in s.
func Join
func Join(a [][]byte, sep []byte) []byte
Join concatenates the elements of a to create a single byte array. The separator sep is placed between elements in the resulting array.
func LastIndex
func LastIndex(s, sep []byte) int
LastIndex returns the index of the last instance of sep in s, or -1 if sep is not present in s.
func Map
func Map(mapping func(rune int) int, s []byte) []byte
Map returns a copy of the byte array s with all its characters modified according to the mapping function. If mapping returns a negative value, the character is dropped from the string with no replacement. The characters in s and the output are interpreted as UTF-8 encoded Unicode code points.
func Repeat
func Repeat(b []byte, count int) []byte
Repeat returns a new byte slice consisting of count copies of b.
func Replace
func Replace(s, old, new []byte, n int) []byte
Replace returns a copy of the slice s with the first n non-overlapping instances of old replaced by new. If n < 0, there is no limit on the number of replacements.
func Runes
func Runes(s []byte) []int
Runes returns a slice of runes (Unicode code points) equivalent to s.
func Split
func Split(s, sep []byte, n int) [][]byte
Split splits the array s around each instance of sep, returning an array of subarrays of s. If sep is empty, Split splits s after each UTF-8 sequence. If n >= 0, Split splits s into at most n subarrays; the last subarray will contain an unsplit remainder. Thus if n == 0, the result will ne nil.
func SplitAfter
func SplitAfter(s, sep []byte, n int) [][]byte
SplitAfter splits the array s after each instance of sep, returning an array of subarrays of s. If sep is empty, SplitAfter splits s after each UTF-8 sequence. If n >= 0, SplitAfter splits s into at most n subarrays; the last subarray will contain an unsplit remainder. Thus if n == 0, the result will ne nil.
func ToLower
func ToLower(s []byte) []byte
ToUpper returns a copy of the byte array s with all Unicode letters mapped to their lower case.
func ToTitle
func ToTitle(s []byte) []byte
ToTitle returns a copy of the byte array s with all Unicode letters mapped to their title case.
func ToUpper
func ToUpper(s []byte) []byte
ToUpper returns a copy of the byte array s with all Unicode letters mapped to their upper case.
func Trim
func Trim(s []byte, cutset string) []byte
Trim returns a subslice of s by slicing off all leading and trailing UTF-8 encoded Unicode code points contained in cutset.
func TrimFunc
func TrimFunc(s []byte, f func(r int) bool) []byte
TrimFunc returns a subslice of s by slicing off all leading and trailing UTF-8 encoded Unicode code points c that satisfy f(c).
func TrimLeft
func TrimLeft(s []byte, cutset string) []byte
TrimLeft returns a subslice of s by slicing off all leading UTF-8 encoded Unicode code points contained in cutset.
func TrimLeftFunc
func TrimLeftFunc(s []byte, f func(r int) bool) []byte
TrimLeftFunc returns a subslice of s by slicing off all leading UTF-8 encoded Unicode code points c that satisfy f(c).
func TrimRight
func TrimRight(s []byte, cutset string) []byte
TrimRight returns a subslice of s by slicing off all trailing UTF-8 encoded Unicode code points that are contained in cutset.
func TrimRightFunc
func TrimRightFunc(s []byte, f func(r int) bool) []byte
TrimRightFunc returns a subslice of s by slicing off all trailing UTF-8 encoded Unicode code points c that satisfy f(c).
func TrimSpace
func TrimSpace(s []byte) []byte
TrimSpace returns a subslice of s by slicing off all leading and trailing white space, as as defined by Unicode.
type Buffer
A Buffer is a variable-sized buffer of bytes with Read and Write methods. The zero value for Buffer is an empty buffer ready to use.
type Buffer struct {
// contains unexported fields
}
func NewBuffer
func NewBuffer(buf []byte) *Buffer
NewBuffer creates and initializes a new Buffer using buf as its initial contents. It is intended to prepare a Buffer to read existing data. It can also be used to to size the internal buffer for writing. To do that, buf should have the desired capacity but a length of zero.
func NewBufferString
func NewBufferString(s string) *Buffer
NewBufferString creates and initializes a new Buffer using string s as its initial contents. It is intended to prepare a buffer to read an existing string.
func (*Buffer) Bytes
func (b *Buffer) Bytes() []byte
Bytes returns a slice of the contents of the unread portion of the buffer; len(b.Bytes()) == b.Len(). If the caller changes the contents of the returned slice, the contents of the buffer will change provided there are no intervening method calls on the Buffer.
func (*Buffer) Len
func (b *Buffer) Len() int
Len returns the number of bytes of the unread portion of the buffer; b.Len() == len(b.Bytes()).
func (*Buffer) Next
func (b *Buffer) Next(n int) []byte
Next returns a slice containing the next n bytes from the buffer, advancing the buffer as if the bytes had been returned by Read. If there are fewer than n bytes in the buffer, Next returns the entire buffer. The slice is only valid until the next call to a read or write method.
func (*Buffer) Read
func (b *Buffer) Read(p []byte) (n int, err os.Error)
Read reads the next len(p) bytes from the buffer or until the buffer is drained. The return value n is the number of bytes read. If the buffer has no data to return, err is os.EOF even if len(p) is zero; otherwise it is nil.
func (*Buffer) ReadByte
func (b *Buffer) ReadByte() (c byte, err os.Error)
ReadByte reads and returns the next byte from the buffer. If no byte is available, it returns error os.EOF.
func (*Buffer) ReadFrom
func (b *Buffer) ReadFrom(r io.Reader) (n int64, err os.Error)
ReadFrom reads data from r until EOF and appends it to the buffer. The return value n is the number of bytes read. Any error except os.EOF encountered during the read is also returned.
func (*Buffer) ReadRune
func (b *Buffer) ReadRune() (r int, size int, err os.Error)
ReadRune reads and returns the next UTF-8-encoded Unicode code point from the buffer. If no bytes are available, the error returned is os.EOF. If the bytes are an erroneous UTF-8 encoding, it consumes one byte and returns U+FFFD, 1.
func (*Buffer) Reset
func (b *Buffer) Reset()
Reset resets the buffer so it has no content. b.Reset() is the same as b.Truncate(0).
func (*Buffer) String
func (b *Buffer) String() string
String returns the contents of the unread portion of the buffer as a string. If the Buffer is a nil pointer, it returns "<nil>".
func (*Buffer) Truncate
func (b *Buffer) Truncate(n int)
Truncate discards all but the first n unread bytes from the buffer. It is an error to call b.Truncate(n) with n > b.Len().
func (*Buffer) Write
func (b *Buffer) Write(p []byte) (n int, err os.Error)
Write appends the contents of p to the buffer. The return value n is the length of p; err is always nil.
func (*Buffer) WriteByte
func (b *Buffer) WriteByte(c byte) os.Error
WriteByte appends the byte c to the buffer. The returned error is always nil, but is included to match bufio.Writer's WriteByte.
func (*Buffer) WriteRune
func (b *Buffer) WriteRune(r int) (n int, err os.Error)
WriteRune appends the UTF-8 encoding of Unicode code point r to the buffer, returning its length and an error, which is always nil but is included to match bufio.Writer's WriteRune.
func (*Buffer) WriteString
func (b *Buffer) WriteString(s string) (n int, err os.Error)
WriteString appends the contents of s to the buffer. The return value n is the length of s; err is always nil.
func (*Buffer) WriteTo
func (b *Buffer) WriteTo(w io.Writer) (n int64, err os.Error)
WriteTo writes data to w until the buffer is drained or an error occurs. The return value n is the number of bytes written. Any error encountered during the write is also returned.