95 lines
2 KiB
Go
95 lines
2 KiB
Go
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package noder
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import (
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"bytes"
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"strings"
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"golang.org/x/text/unicode/norm"
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)
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// Path values represent a noder and its ancestors. The root goes first
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// and the actual final noder the path is referring to will be the last.
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//
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// A path implements the Noder interface, redirecting all the interface
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// calls to its final noder.
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//
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// Paths build from an empty Noder slice are not valid paths and should
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// not be used.
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type Path []Noder
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// String returns the full path of the final noder as a string, using
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// "/" as the separator.
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func (p Path) String() string {
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var buf bytes.Buffer
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sep := ""
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for _, e := range p {
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_, _ = buf.WriteString(sep)
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sep = "/"
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_, _ = buf.WriteString(e.Name())
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}
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return buf.String()
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}
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// Last returns the final noder in the path.
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func (p Path) Last() Noder {
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return p[len(p)-1]
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}
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// Hash returns the hash of the final noder of the path.
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func (p Path) Hash() []byte {
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return p.Last().Hash()
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}
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// Name returns the name of the final noder of the path.
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func (p Path) Name() string {
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return p.Last().Name()
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}
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// IsDir returns if the final noder of the path is a directory-like
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// noder.
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func (p Path) IsDir() bool {
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return p.Last().IsDir()
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}
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// Children returns the children of the final noder in the path.
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func (p Path) Children() ([]Noder, error) {
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return p.Last().Children()
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}
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// NumChildren returns the number of children the final noder of the
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// path has.
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func (p Path) NumChildren() (int, error) {
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return p.Last().NumChildren()
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}
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// Compare returns -1, 0 or 1 if the path p is smaller, equal or bigger
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// than other, in "directory order"; for example:
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//
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// "a" < "b"
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// "a/b/c/d/z" < "b"
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// "a/b/a" > "a/b"
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func (p Path) Compare(other Path) int {
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i := 0
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for {
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switch {
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case len(other) == len(p) && i == len(p):
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return 0
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case i == len(other):
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return 1
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case i == len(p):
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return -1
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default:
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form := norm.Form(norm.NFC)
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this := form.String(p[i].Name())
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that := form.String(other[i].Name())
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cmp := strings.Compare(this, that)
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if cmp != 0 {
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return cmp
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}
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}
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i++
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}
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}
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