mirror of https://github.com/perkeep/perkeep.git
130 lines
3.1 KiB
Go
130 lines
3.1 KiB
Go
/*
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Copyright 2011 Google Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package index
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import (
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"net/url"
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"time"
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"perkeep.org/pkg/blob"
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"perkeep.org/pkg/schema"
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"perkeep.org/pkg/types/camtypes"
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)
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var urle = url.QueryEscape
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func urld(s string) string {
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d, _ := url.QueryUnescape(s)
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return d
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}
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type dupSkipper struct {
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m map[string]bool
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}
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// not thread safe.
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func (s *dupSkipper) Dup(v string) bool {
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if s.m == nil {
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s.m = make(map[string]bool)
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}
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if s.m[v] {
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return true
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}
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s.m[v] = true
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return false
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}
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// ClaimsAttrValue returns the value of attr from claims,
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// or the empty string if not found.
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// Claims should be sorted by claim.Date.
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func ClaimsAttrValue(claims []camtypes.Claim, attr string, at time.Time, signerFilter blob.Ref) string {
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return claimsIntfAttrValue(claimSlice(claims), attr, at, signerFilter)
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}
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// claimPtrsAttrValue returns the value of attr from claims,
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// or the empty string if not found.
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// Claims should be sorted by claim.Date.
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func claimPtrsAttrValue(claims []*camtypes.Claim, attr string, at time.Time, signerFilter blob.Ref) string {
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return claimsIntfAttrValue(claimPtrSlice(claims), attr, at, signerFilter)
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}
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type claimsIntf interface {
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Len() int
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Claim(i int) *camtypes.Claim
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}
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type claimSlice []camtypes.Claim
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func (s claimSlice) Len() int { return len(s) }
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func (s claimSlice) Claim(i int) *camtypes.Claim { return &s[i] }
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type claimPtrSlice []*camtypes.Claim
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func (s claimPtrSlice) Len() int { return len(s) }
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func (s claimPtrSlice) Claim(i int) *camtypes.Claim { return s[i] }
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// claimsIntfAttrValue finds the value of an attribute in a list of claims
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// or empty string if not found. claims must be non-nil.
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func claimsIntfAttrValue(claims claimsIntf, attr string, at time.Time, signerFilter blob.Ref) string {
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if claims == nil {
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panic("nil claims argument in claimsIntfAttrValue")
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}
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if at.IsZero() {
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at = time.Now()
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}
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// use a small static buffer as it speeds up
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// search.BenchmarkQueryPermanodeLocation by 6-7%
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// with go 1.7.1
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var buf [8]string
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v := buf[:][:0]
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for i := 0; i < claims.Len(); i++ {
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cl := claims.Claim(i)
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if cl.Attr != attr || cl.Date.After(at) {
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continue
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}
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if signerFilter.Valid() && signerFilter != cl.Signer {
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continue
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}
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switch cl.Type {
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case string(schema.DelAttributeClaim):
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if cl.Value == "" {
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v = v[:0]
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} else {
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i := 0
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for _, w := range v {
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if w != cl.Value {
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v[i] = w
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i++
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}
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}
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v = v[:i]
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}
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case string(schema.SetAttributeClaim):
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v = append(v[:0], cl.Value)
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case string(schema.AddAttributeClaim):
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v = append(v, cl.Value)
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}
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}
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if len(v) != 0 {
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return v[0]
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}
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return ""
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}
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