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node.go
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node.go
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package pg_query
import (
"crypto/sha1"
"hash"
"io"
"reflect"
"strings"
)
type FingerprintContext interface {
WriteString(string)
}
type FingerprintHashContext struct {
hash hash.Hash
}
func NewFingerprintHashContext() *FingerprintHashContext {
return &FingerprintHashContext{hash: sha1.New()}
}
func (ctx FingerprintHashContext) WriteString(str string) {
io.WriteString(ctx.hash, str)
}
func (ctx FingerprintHashContext) Sum() []byte {
return ctx.hash.Sum(nil)
}
// ...
type FingerprintSubContext struct {
parts []string
}
type FingerprintSubContextSlice []FingerprintSubContext
func NewFingerprintSubContext() *FingerprintSubContext {
return &FingerprintSubContext{parts: []string{}}
}
func (ctx *FingerprintSubContext) WriteString(str string) {
ctx.parts = append(ctx.parts, str)
}
func (ctx FingerprintSubContext) Sum() []string {
return ctx.parts
}
func (ctx FingerprintSubContext) Equal(other FingerprintSubContext) bool {
return reflect.DeepEqual(ctx, other)
}
func (p FingerprintSubContextSlice) Len() int {
return len(p)
}
func (p FingerprintSubContextSlice) Less(i, j int) bool {
left := strings.Join(p[i].parts, "")
right := strings.Join(p[j].parts, "")
return left < right
}
func (p FingerprintSubContextSlice) Swap(i, j int) {
p[i], p[j] = p[j], p[i]
}
func (p *FingerprintSubContextSlice) AddIfUnique(ctx FingerprintSubContext) {
for _, existing := range *p {
if ctx.Equal(existing) {
return
}
}
*p = append(*p, ctx)
}
// ...
type Node interface {
Deparse() string
Fingerprint(FingerprintContext, Node, string)
}