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https://github.com/superseriousbusiness/gotosocial
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update dependencies (#296)
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tobi
GitHub
326
vendor/codeberg.org/gruf/go-fastpath/path.go
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vendored
Normal file
326
vendor/codeberg.org/gruf/go-fastpath/path.go
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vendored
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package fastpath
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import (
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"unsafe"
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)
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// allocate these just once
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var (
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dot = []byte(".")
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dotStr = ".'"
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)
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type Builder struct {
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B []byte // B is the underlying byte buffer
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dd int // pos of last '..' appended to builder
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abs bool // abs stores whether path passed to first .Append() is absolute
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set bool // set stores whether b.abs has been set i.e. not first call to .Append()
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}
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// NewBuilder returns a new Builder object using the supplied byte
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// slice as the underlying buffer
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func NewBuilder(b []byte) Builder {
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if b != nil {
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b = b[:0]
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}
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return Builder{
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B: b,
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dd: 0,
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abs: false,
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set: false,
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}
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}
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// Reset resets the Builder object
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func (b *Builder) Reset() {
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b.B = b.B[:0]
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b.dd = 0
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b.abs = false
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b.set = false
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}
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// Len returns the number of accumulated bytes in the Builder
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func (b *Builder) Len() int {
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return len(b.B)
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}
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// Cap returns the capacity of the underlying Builder buffer
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func (b *Builder) Cap() int {
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return cap(b.B)
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}
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// Bytes returns the accumulated path bytes.
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func (b *Builder) Bytes() []byte {
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if b.Len() < 1 {
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return dot
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}
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return b.B
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}
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// String returns the accumulated path string.
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func (b *Builder) String() string {
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if b.Len() < 1 {
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return dotStr
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}
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return string(b.B)
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}
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// StringPtr returns a ptr to the accumulated path string.
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//
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// Please note the underlying byte slice for this string is
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// tied to the builder, so any changes will result in the
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// returned string changing. Consider using .String() if
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// this is undesired behaviour.
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func (b *Builder) StringPtr() string {
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if b.Len() < 1 {
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return dotStr
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}
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return *(*string)(unsafe.Pointer(&b.B))
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}
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// Absolute returns whether current path is absolute (not relative)
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func (b *Builder) Absolute() bool {
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return b.abs
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}
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// SetAbsolute converts the current path to / from absolute
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func (b *Builder) SetAbsolute(val bool) {
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if !b.set {
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if val {
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// .Append() has not be called,
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// add a '/' and set abs
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b.guarantee(1)
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b.appendByte('/')
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b.abs = true
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}
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// Set as having been set
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b.set = true
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return
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}
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if !val && b.abs {
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// Already set and absolute. Update
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b.abs = false
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// If not empty (i.e. not just '/'),
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// then shift bytes 1 left
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if b.Len() > 1 {
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copy(b.B, b.B[1:])
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}
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// Truncate 1 byte. In the case of empty,
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// i.e. just '/' then it will drop this
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b.truncate(1)
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} else if val && !b.abs {
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// Already set but NOT abs. Update
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b.abs = true
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// Guarantee 1 byte available
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b.guarantee(1)
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// If empty, just append '/'
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if b.Len() < 1 {
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b.appendByte('/')
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return
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}
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// Increase length
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l := b.Len()
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b.B = b.B[:l+1]
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// Shift bytes 1 right
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copy(b.B[1:], b.B[:l])
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// Set first byte '/'
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b.B[0] = '/'
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}
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}
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// Append adds and cleans the supplied path bytes to the
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// builder's internal buffer, growing the buffer if necessary
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// to accomodate the extra path length
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func (b *Builder) Append(p []byte) {
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b.AppendString(*(*string)(unsafe.Pointer(&p)))
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}
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// AppendString adds and cleans the supplied path string to the
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// builder's internal buffer, growing the buffer if necessary
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// to accomodate the extra path length
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func (b *Builder) AppendString(path string) {
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defer func() {
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// If buffer is empty, and an absolute path,
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// ensure it starts with a '/'
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if b.Len() < 1 && b.abs {
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b.appendByte('/')
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}
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}()
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// Empty path, nothing to do
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if len(path) == 0 {
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return
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}
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// Guarantee at least the total length
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// of supplied path available in the buffer
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b.guarantee(len(path))
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// Try store if absolute
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if !b.set {
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b.abs = len(path) > 0 && path[0] == '/'
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b.set = true
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}
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i := 0
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for i < len(path) {
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switch {
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// Empty path segment
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case path[i] == '/':
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i++
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// Singular '.' path segment, treat as empty
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case path[i] == '.' && (i+1 == len(path) || path[i+1] == '/'):
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i++
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// Backtrack segment
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case path[i] == '.' && path[i+1] == '.' && (i+2 == len(path) || path[i+2] == '/'):
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i += 2
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switch {
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// Check if it's possible to backtrack with
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// our current state of the buffer. i.e. is
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// our buffer length longer than the last
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// '..' we placed?
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case b.Len() > b.dd:
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b.backtrack()
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// b.cp = b.lp
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// b.lp = 0
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// If we reached here, need to check if
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// we can append '..' to the path buffer,
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// which is ONLY when path is NOT absolute
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case !b.abs:
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if b.Len() > 0 {
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b.appendByte('/')
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}
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b.appendByte('.')
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b.appendByte('.')
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b.dd = b.Len()
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// b.lp = lp - 2
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// b.cp = b.dd
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}
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default:
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if (b.abs && b.Len() != 1) || (!b.abs && b.Len() > 0) {
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b.appendByte('/')
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}
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// b.lp = b.cp
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// b.cp = b.Len()
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i += b.appendSlice(path[i:])
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}
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}
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}
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// Clean creates the shortest possible functional equivalent
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// to the supplied path, resetting the builder before performing
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// this operation. The builder object is NOT reset after return
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func (b *Builder) Clean(path string) string {
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b.Reset()
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b.AppendString(path)
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return b.String()
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}
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// Join connects and cleans multiple paths, resetting the builder before
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// performing this operation and returning the shortest possible combination
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// of all the supplied paths. The builder object is NOT reset after return
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func (b *Builder) Join(base string, paths ...string) string {
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empty := (len(base) < 1)
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b.Reset()
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b.AppendString(base)
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for _, path := range paths {
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b.AppendString(path)
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empty = empty && (len(path) < 1)
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}
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if empty {
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return ""
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}
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return b.String()
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}
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// Guarantee ensures there is at least the requested size
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// free bytes available in the buffer, reallocating if
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// necessary
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func (b *Builder) Guarantee(size int) {
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b.guarantee(size)
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}
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// Truncate reduces the length of the buffer by the requested
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// number of bytes. If the builder is set to absolute, the first
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// byte (i.e. '/') will never be truncated
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func (b *Builder) Truncate(size int) {
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// If absolute and just '/', do nothing
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if b.abs && b.Len() == 1 {
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return
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}
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// Truncate requested bytes
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b.truncate(size)
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}
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// truncate reduces the length of the buffer by the requested size,
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// no sanity checks are performed
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func (b *Builder) truncate(size int) {
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b.B = b.B[:b.Len()-size]
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}
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// guarantee ensures there is at least the requested size
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// free bytes available in the buffer, reallocating if necessary.
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// no sanity checks are performed
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func (b *Builder) guarantee(size int) {
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if size > b.Cap()-b.Len() {
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nb := make([]byte, 2*b.Cap()+size)
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copy(nb, b.B)
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b.B = nb[:b.Len()]
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}
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}
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// appendByte appends the supplied byte to the end of
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// the buffer. appending is achieved by continually reslicing the
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// buffer and setting the next byte-at-index, this is safe as guarantee()
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// will have been called beforehand
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func (b *Builder) appendByte(c byte) {
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b.B = b.B[:b.Len()+1]
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b.B[b.Len()-1] = c
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}
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// appendSlice appends the supplied string slice to
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// the end of the buffer and returns the number of indices
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// we were able to iterate before hitting a path separator '/'.
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// appending is achieved by continually reslicing the buffer
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// and setting the next byte-at-index, this is safe as guarantee()
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// will have been called beforehand
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func (b *Builder) appendSlice(slice string) int {
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i := 0
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for i < len(slice) && slice[i] != '/' {
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b.B = b.B[:b.Len()+1]
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b.B[b.Len()-1] = slice[i]
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i++
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}
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return i
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}
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// backtrack reduces the end of the buffer back to the last
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// separating '/', or end of buffer
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func (b *Builder) backtrack() {
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b.B = b.B[:b.Len()-1]
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for b.Len()-1 > b.dd && b.B[b.Len()-1] != '/' {
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b.B = b.B[:b.Len()-1]
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}
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if b.Len() > 0 {
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b.B = b.B[:b.Len()-1]
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}
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}
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