mirror of
https://github.com/superseriousbusiness/gotosocial.git
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99 lines
2.1 KiB
Go
99 lines
2.1 KiB
Go
package structr
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import (
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"fmt"
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"reflect"
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"sync"
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"unicode"
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"unicode/utf8"
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"github.com/zeebo/xxh3"
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)
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// findField will search for a struct field with given set of names, where names is a len > 0 slice of names account for nesting.
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func findField(t reflect.Type, names []string, allowZero bool) (sfield structfield, ok bool) {
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var (
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// isExported returns whether name is exported
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// from a package; can be func or struct field.
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isExported = func(name string) bool {
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r, _ := utf8.DecodeRuneInString(name)
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return unicode.IsUpper(r)
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}
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// popName pops the next name from
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// the provided slice of field names.
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popName = func() string {
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// Pop next name.
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name := names[0]
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names = names[1:]
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// Ensure valid name.
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if !isExported(name) {
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panicf("field is not exported: %s", name)
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}
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return name
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}
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// field is the iteratively searched-for
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// struct field value in below loop.
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field reflect.StructField
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)
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for len(names) > 0 {
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// Pop next name.
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name := popName()
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// Follow any ptrs leading to field.
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for t.Kind() == reflect.Pointer {
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t = t.Elem()
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}
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if t.Kind() != reflect.Struct {
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// The end type after following ptrs must be struct.
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panicf("field %s is not struct (ptr): %s", t, name)
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}
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// Look for next field by name.
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field, ok = t.FieldByName(name)
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if !ok {
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return
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}
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// Append next set of indices required to reach field.
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sfield.index = append(sfield.index, field.Index...)
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// Set the next type.
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t = field.Type
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}
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// Get final type hash func.
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sfield.hasher = hasher(t)
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return
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}
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// panicf provides a panic with string formatting.
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func panicf(format string, args ...any) {
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panic(fmt.Sprintf(format, args...))
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}
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// hashPool provides a memory pool of xxh3
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// hasher objects used indexing field vals.
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var hashPool sync.Pool
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// gethashbuf fetches hasher from memory pool.
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func getHasher() *xxh3.Hasher {
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v := hashPool.Get()
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if v == nil {
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v = new(xxh3.Hasher)
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}
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return v.(*xxh3.Hasher)
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}
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// putHasher replaces hasher in memory pool.
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func putHasher(h *xxh3.Hasher) {
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h.Reset()
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hashPool.Put(h)
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}
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