mirror of
https://github.com/gohugoio/hugo.git
synced 2024-12-29 02:13:34 +00:00
743 lines
18 KiB
Go
743 lines
18 KiB
Go
// Copyright 2019 The Hugo Authors. All rights reserved.
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//
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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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//
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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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// Package collections provides template functions for manipulating collections
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// such as arrays, maps, and slices.
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package collections
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import (
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"fmt"
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"html/template"
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"math/rand"
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"net/url"
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"reflect"
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"strings"
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"time"
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"github.com/gohugoio/hugo/common/collections"
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"github.com/gohugoio/hugo/common/maps"
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"github.com/gohugoio/hugo/common/types"
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"github.com/gohugoio/hugo/deps"
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"github.com/gohugoio/hugo/helpers"
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"github.com/pkg/errors"
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"github.com/spf13/cast"
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)
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func init() {
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rand.Seed(time.Now().UTC().UnixNano())
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}
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// New returns a new instance of the collections-namespaced template functions.
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func New(deps *deps.Deps) *Namespace {
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return &Namespace{
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deps: deps,
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}
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}
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// Namespace provides template functions for the "collections" namespace.
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type Namespace struct {
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deps *deps.Deps
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}
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// After returns all the items after the first N in a rangeable list.
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func (ns *Namespace) After(index interface{}, seq interface{}) (interface{}, error) {
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if index == nil || seq == nil {
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return nil, errors.New("both limit and seq must be provided")
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}
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indexv, err := cast.ToIntE(index)
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if err != nil {
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return nil, err
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}
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if indexv < 0 {
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return nil, errors.New("sequence bounds out of range [" + cast.ToString(indexv) + ":]")
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}
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seqv := reflect.ValueOf(seq)
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seqv, isNil := indirect(seqv)
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if isNil {
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return nil, errors.New("can't iterate over a nil value")
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}
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switch seqv.Kind() {
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case reflect.Array, reflect.Slice, reflect.String:
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// okay
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default:
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return nil, errors.New("can't iterate over " + reflect.ValueOf(seq).Type().String())
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}
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if indexv >= seqv.Len() {
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return seqv.Slice(0, 0).Interface(), nil
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}
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return seqv.Slice(indexv, seqv.Len()).Interface(), nil
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}
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// Delimit takes a given sequence and returns a delimited HTML string.
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// If last is passed to the function, it will be used as the final delimiter.
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func (ns *Namespace) Delimit(seq, delimiter interface{}, last ...interface{}) (template.HTML, error) {
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d, err := cast.ToStringE(delimiter)
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if err != nil {
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return "", err
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}
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var dLast *string
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if len(last) > 0 {
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l := last[0]
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dStr, err := cast.ToStringE(l)
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if err != nil {
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dLast = nil
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} else {
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dLast = &dStr
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}
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}
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seqv := reflect.ValueOf(seq)
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seqv, isNil := indirect(seqv)
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if isNil {
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return "", errors.New("can't iterate over a nil value")
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}
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var str string
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switch seqv.Kind() {
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case reflect.Map:
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sortSeq, err := ns.Sort(seq)
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if err != nil {
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return "", err
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}
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seqv = reflect.ValueOf(sortSeq)
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fallthrough
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case reflect.Array, reflect.Slice, reflect.String:
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for i := 0; i < seqv.Len(); i++ {
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val := seqv.Index(i).Interface()
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valStr, err := cast.ToStringE(val)
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if err != nil {
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continue
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}
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switch {
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case i == seqv.Len()-2 && dLast != nil:
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str += valStr + *dLast
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case i == seqv.Len()-1:
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str += valStr
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default:
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str += valStr + d
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}
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}
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default:
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return "", fmt.Errorf("can't iterate over %v", seq)
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}
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return template.HTML(str), nil
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}
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// Dictionary creates a map[string]interface{} from the given parameters by
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// walking the parameters and treating them as key-value pairs. The number
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// of parameters must be even.
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// The keys can be string slices, which will create the needed nested structure.
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func (ns *Namespace) Dictionary(values ...interface{}) (map[string]interface{}, error) {
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if len(values)%2 != 0 {
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return nil, errors.New("invalid dictionary call")
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}
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root := make(map[string]interface{})
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for i := 0; i < len(values); i += 2 {
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dict := root
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var key string
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switch v := values[i].(type) {
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case string:
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key = v
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case []string:
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for i := 0; i < len(v)-1; i++ {
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key = v[i]
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var m map[string]interface{}
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v, found := dict[key]
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if found {
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m = v.(map[string]interface{})
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} else {
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m = make(map[string]interface{})
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dict[key] = m
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}
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dict = m
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}
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key = v[len(v)-1]
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default:
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return nil, errors.New("invalid dictionary key")
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}
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dict[key] = values[i+1]
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}
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return root, nil
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}
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// EchoParam returns a given value if it is set; otherwise, it returns an
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// empty string.
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func (ns *Namespace) EchoParam(a, key interface{}) interface{} {
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av, isNil := indirect(reflect.ValueOf(a))
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if isNil {
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return ""
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}
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var avv reflect.Value
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switch av.Kind() {
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case reflect.Array, reflect.Slice:
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index, ok := key.(int)
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if ok && av.Len() > index {
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avv = av.Index(index)
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}
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case reflect.Map:
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kv := reflect.ValueOf(key)
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if kv.Type().AssignableTo(av.Type().Key()) {
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avv = av.MapIndex(kv)
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}
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}
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avv, isNil = indirect(avv)
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if isNil {
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return ""
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}
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if avv.IsValid() {
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switch avv.Kind() {
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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return avv.Int()
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case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
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return avv.Uint()
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case reflect.Float32, reflect.Float64:
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return avv.Float()
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case reflect.String:
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return avv.String()
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}
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}
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return ""
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}
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// First returns the first N items in a rangeable list.
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func (ns *Namespace) First(limit interface{}, seq interface{}) (interface{}, error) {
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if limit == nil || seq == nil {
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return nil, errors.New("both limit and seq must be provided")
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}
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limitv, err := cast.ToIntE(limit)
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if err != nil {
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return nil, err
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}
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if limitv < 0 {
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return nil, errors.New("sequence length must be non-negative")
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}
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seqv := reflect.ValueOf(seq)
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seqv, isNil := indirect(seqv)
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if isNil {
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return nil, errors.New("can't iterate over a nil value")
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}
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switch seqv.Kind() {
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case reflect.Array, reflect.Slice, reflect.String:
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// okay
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default:
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return nil, errors.New("can't iterate over " + reflect.ValueOf(seq).Type().String())
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}
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if limitv > seqv.Len() {
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limitv = seqv.Len()
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}
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return seqv.Slice(0, limitv).Interface(), nil
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}
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// In returns whether v is in the set l. l may be an array or slice.
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func (ns *Namespace) In(l interface{}, v interface{}) (bool, error) {
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if l == nil || v == nil {
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return false, nil
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}
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lv := reflect.ValueOf(l)
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vv := reflect.ValueOf(v)
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if !vv.Type().Comparable() {
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return false, errors.Errorf("value to check must be comparable: %T", v)
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}
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// Normalize numeric types to float64 etc.
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vvk := normalize(vv)
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switch lv.Kind() {
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case reflect.Array, reflect.Slice:
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for i := 0; i < lv.Len(); i++ {
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lvv, isNil := indirectInterface(lv.Index(i))
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if isNil || !lvv.Type().Comparable() {
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continue
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}
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lvvk := normalize(lvv)
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if lvvk == vvk {
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return true, nil
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}
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}
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case reflect.String:
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if vv.Type() == lv.Type() && strings.Contains(lv.String(), vv.String()) {
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return true, nil
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}
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}
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return false, nil
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}
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// Intersect returns the common elements in the given sets, l1 and l2. l1 and
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// l2 must be of the same type and may be either arrays or slices.
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func (ns *Namespace) Intersect(l1, l2 interface{}) (interface{}, error) {
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if l1 == nil || l2 == nil {
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return make([]interface{}, 0), nil
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}
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var ins *intersector
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l1v := reflect.ValueOf(l1)
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l2v := reflect.ValueOf(l2)
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switch l1v.Kind() {
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case reflect.Array, reflect.Slice:
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ins = &intersector{r: reflect.MakeSlice(l1v.Type(), 0, 0), seen: make(map[interface{}]bool)}
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switch l2v.Kind() {
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case reflect.Array, reflect.Slice:
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for i := 0; i < l1v.Len(); i++ {
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l1vv := l1v.Index(i)
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if !l1vv.Type().Comparable() {
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return make([]interface{}, 0), errors.New("intersect does not support slices or arrays of uncomparable types")
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}
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for j := 0; j < l2v.Len(); j++ {
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l2vv := l2v.Index(j)
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if !l2vv.Type().Comparable() {
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return make([]interface{}, 0), errors.New("intersect does not support slices or arrays of uncomparable types")
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}
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ins.handleValuePair(l1vv, l2vv)
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}
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}
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return ins.r.Interface(), nil
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default:
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return nil, errors.New("can't iterate over " + reflect.ValueOf(l2).Type().String())
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}
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default:
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return nil, errors.New("can't iterate over " + reflect.ValueOf(l1).Type().String())
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}
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}
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// Group groups a set of elements by the given key.
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// This is currently only supported for Pages.
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func (ns *Namespace) Group(key interface{}, items interface{}) (interface{}, error) {
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if key == nil {
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return nil, errors.New("nil is not a valid key to group by")
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}
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if g, ok := items.(collections.Grouper); ok {
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return g.Group(key, items)
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}
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in := newSliceElement(items)
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if g, ok := in.(collections.Grouper); ok {
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return g.Group(key, items)
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}
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return nil, fmt.Errorf("grouping not supported for type %T %T", items, in)
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}
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// IsSet returns whether a given array, channel, slice, or map has a key
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// defined.
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func (ns *Namespace) IsSet(a interface{}, key interface{}) (bool, error) {
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av := reflect.ValueOf(a)
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kv := reflect.ValueOf(key)
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switch av.Kind() {
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case reflect.Array, reflect.Chan, reflect.Slice:
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k, err := cast.ToIntE(key)
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if err != nil {
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return false, fmt.Errorf("isset unable to use key of type %T as index", key)
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}
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if av.Len() > k {
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return true, nil
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}
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case reflect.Map:
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if kv.Type() == av.Type().Key() {
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return av.MapIndex(kv).IsValid(), nil
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}
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default:
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helpers.DistinctFeedbackLog.Printf("WARNING: calling IsSet with unsupported type %q (%T) will always return false.\n", av.Kind(), a)
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}
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return false, nil
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}
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// Last returns the last N items in a rangeable list.
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func (ns *Namespace) Last(limit interface{}, seq interface{}) (interface{}, error) {
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if limit == nil || seq == nil {
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return nil, errors.New("both limit and seq must be provided")
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}
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limitv, err := cast.ToIntE(limit)
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if err != nil {
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return nil, err
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}
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if limitv < 0 {
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return nil, errors.New("sequence length must be non-negative")
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}
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seqv := reflect.ValueOf(seq)
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seqv, isNil := indirect(seqv)
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if isNil {
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return nil, errors.New("can't iterate over a nil value")
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}
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switch seqv.Kind() {
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case reflect.Array, reflect.Slice, reflect.String:
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// okay
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default:
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return nil, errors.New("can't iterate over " + reflect.ValueOf(seq).Type().String())
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}
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if limitv > seqv.Len() {
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limitv = seqv.Len()
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}
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return seqv.Slice(seqv.Len()-limitv, seqv.Len()).Interface(), nil
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}
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// Querify encodes the given parameters in URL-encoded form ("bar=baz&foo=quux") sorted by key.
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func (ns *Namespace) Querify(params ...interface{}) (string, error) {
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qs := url.Values{}
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vals, err := ns.Dictionary(params...)
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if err != nil {
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return "", errors.New("querify keys must be strings")
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}
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for name, value := range vals {
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qs.Add(name, fmt.Sprintf("%v", value))
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}
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return qs.Encode(), nil
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}
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// Reverse creates a copy of slice and reverses it.
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func (ns *Namespace) Reverse(slice interface{}) (interface{}, error) {
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if slice == nil {
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return nil, nil
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}
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v := reflect.ValueOf(slice)
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switch v.Kind() {
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case reflect.Slice:
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default:
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return nil, errors.New("argument must be a slice")
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}
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sliceCopy := reflect.MakeSlice(v.Type(), v.Len(), v.Len())
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for i := v.Len() - 1; i >= 0; i-- {
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element := sliceCopy.Index(i)
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element.Set(v.Index(v.Len() - 1 - i))
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}
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return sliceCopy.Interface(), nil
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}
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// Seq creates a sequence of integers. It's named and used as GNU's seq.
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//
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// Examples:
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// 3 => 1, 2, 3
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// 1 2 4 => 1, 3
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// -3 => -1, -2, -3
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// 1 4 => 1, 2, 3, 4
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// 1 -2 => 1, 0, -1, -2
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func (ns *Namespace) Seq(args ...interface{}) ([]int, error) {
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if len(args) < 1 || len(args) > 3 {
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return nil, errors.New("invalid number of arguments to Seq")
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}
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intArgs := cast.ToIntSlice(args)
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if len(intArgs) < 1 || len(intArgs) > 3 {
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return nil, errors.New("invalid arguments to Seq")
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}
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var inc = 1
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var last int
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var first = intArgs[0]
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if len(intArgs) == 1 {
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last = first
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if last == 0 {
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return []int{}, nil
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} else if last > 0 {
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first = 1
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} else {
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first = -1
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inc = -1
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}
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} else if len(intArgs) == 2 {
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last = intArgs[1]
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if last < first {
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inc = -1
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}
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} else {
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inc = intArgs[1]
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last = intArgs[2]
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if inc == 0 {
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return nil, errors.New("'increment' must not be 0")
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}
|
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if first < last && inc < 0 {
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return nil, errors.New("'increment' must be > 0")
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}
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if first > last && inc > 0 {
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return nil, errors.New("'increment' must be < 0")
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}
|
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}
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|
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// sanity check
|
|
if last < -100000 {
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return nil, errors.New("size of result exceeds limit")
|
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}
|
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size := ((last - first) / inc) + 1
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|
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// sanity check
|
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if size <= 0 || size > 2000 {
|
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return nil, errors.New("size of result exceeds limit")
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}
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|
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seq := make([]int, size)
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val := first
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for i := 0; ; i++ {
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seq[i] = val
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val += inc
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if (inc < 0 && val < last) || (inc > 0 && val > last) {
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break
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}
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}
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|
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return seq, nil
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}
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|
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// Shuffle returns the given rangeable list in a randomised order.
|
|
func (ns *Namespace) Shuffle(seq interface{}) (interface{}, error) {
|
|
if seq == nil {
|
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return nil, errors.New("both count and seq must be provided")
|
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}
|
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|
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seqv := reflect.ValueOf(seq)
|
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seqv, isNil := indirect(seqv)
|
|
if isNil {
|
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return nil, errors.New("can't iterate over a nil value")
|
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}
|
|
|
|
switch seqv.Kind() {
|
|
case reflect.Array, reflect.Slice, reflect.String:
|
|
// okay
|
|
default:
|
|
return nil, errors.New("can't iterate over " + reflect.ValueOf(seq).Type().String())
|
|
}
|
|
|
|
shuffled := reflect.MakeSlice(reflect.TypeOf(seq), seqv.Len(), seqv.Len())
|
|
|
|
randomIndices := rand.Perm(seqv.Len())
|
|
|
|
for index, value := range randomIndices {
|
|
shuffled.Index(value).Set(seqv.Index(index))
|
|
}
|
|
|
|
return shuffled.Interface(), nil
|
|
}
|
|
|
|
// Slice returns a slice of all passed arguments.
|
|
func (ns *Namespace) Slice(args ...interface{}) interface{} {
|
|
if len(args) == 0 {
|
|
return args
|
|
}
|
|
|
|
return collections.Slice(args...)
|
|
}
|
|
|
|
type intersector struct {
|
|
r reflect.Value
|
|
seen map[interface{}]bool
|
|
}
|
|
|
|
func (i *intersector) appendIfNotSeen(v reflect.Value) {
|
|
|
|
vi := v.Interface()
|
|
if !i.seen[vi] {
|
|
i.r = reflect.Append(i.r, v)
|
|
i.seen[vi] = true
|
|
}
|
|
}
|
|
|
|
func (i *intersector) handleValuePair(l1vv, l2vv reflect.Value) {
|
|
switch kind := l1vv.Kind(); {
|
|
case kind == reflect.String:
|
|
l2t, err := toString(l2vv)
|
|
if err == nil && l1vv.String() == l2t {
|
|
i.appendIfNotSeen(l1vv)
|
|
}
|
|
case isNumber(kind):
|
|
f1, err1 := numberToFloat(l1vv)
|
|
f2, err2 := numberToFloat(l2vv)
|
|
if err1 == nil && err2 == nil && f1 == f2 {
|
|
i.appendIfNotSeen(l1vv)
|
|
}
|
|
case kind == reflect.Ptr, kind == reflect.Struct:
|
|
if l1vv.Interface() == l2vv.Interface() {
|
|
i.appendIfNotSeen(l1vv)
|
|
}
|
|
case kind == reflect.Interface:
|
|
i.handleValuePair(reflect.ValueOf(l1vv.Interface()), l2vv)
|
|
}
|
|
}
|
|
|
|
// Union returns the union of the given sets, l1 and l2. l1 and
|
|
// l2 must be of the same type and may be either arrays or slices.
|
|
// If l1 and l2 aren't of the same type then l1 will be returned.
|
|
// If either l1 or l2 is nil then the non-nil list will be returned.
|
|
func (ns *Namespace) Union(l1, l2 interface{}) (interface{}, error) {
|
|
if l1 == nil && l2 == nil {
|
|
return []interface{}{}, nil
|
|
} else if l1 == nil && l2 != nil {
|
|
return l2, nil
|
|
} else if l1 != nil && l2 == nil {
|
|
return l1, nil
|
|
}
|
|
|
|
l1v := reflect.ValueOf(l1)
|
|
l2v := reflect.ValueOf(l2)
|
|
|
|
var ins *intersector
|
|
|
|
switch l1v.Kind() {
|
|
case reflect.Array, reflect.Slice:
|
|
switch l2v.Kind() {
|
|
case reflect.Array, reflect.Slice:
|
|
ins = &intersector{r: reflect.MakeSlice(l1v.Type(), 0, 0), seen: make(map[interface{}]bool)}
|
|
|
|
if l1v.Type() != l2v.Type() &&
|
|
l1v.Type().Elem().Kind() != reflect.Interface &&
|
|
l2v.Type().Elem().Kind() != reflect.Interface {
|
|
return ins.r.Interface(), nil
|
|
}
|
|
|
|
var (
|
|
l1vv reflect.Value
|
|
isNil bool
|
|
)
|
|
|
|
for i := 0; i < l1v.Len(); i++ {
|
|
l1vv, isNil = indirectInterface(l1v.Index(i))
|
|
|
|
if !l1vv.Type().Comparable() {
|
|
return []interface{}{}, errors.New("union does not support slices or arrays of uncomparable types")
|
|
}
|
|
|
|
if !isNil {
|
|
ins.appendIfNotSeen(l1vv)
|
|
}
|
|
}
|
|
|
|
if !l1vv.IsValid() {
|
|
// The first slice may be empty. Pick the first value of the second
|
|
// to use as a prototype.
|
|
if l2v.Len() > 0 {
|
|
l1vv = l2v.Index(0)
|
|
}
|
|
}
|
|
|
|
for j := 0; j < l2v.Len(); j++ {
|
|
l2vv := l2v.Index(j)
|
|
|
|
switch kind := l1vv.Kind(); {
|
|
case kind == reflect.String:
|
|
l2t, err := toString(l2vv)
|
|
if err == nil {
|
|
ins.appendIfNotSeen(reflect.ValueOf(l2t))
|
|
}
|
|
case isNumber(kind):
|
|
var err error
|
|
l2vv, err = convertNumber(l2vv, kind)
|
|
if err == nil {
|
|
ins.appendIfNotSeen(l2vv)
|
|
}
|
|
case kind == reflect.Interface, kind == reflect.Struct, kind == reflect.Ptr:
|
|
ins.appendIfNotSeen(l2vv)
|
|
|
|
}
|
|
}
|
|
|
|
return ins.r.Interface(), nil
|
|
default:
|
|
return nil, errors.New("can't iterate over " + reflect.ValueOf(l2).Type().String())
|
|
}
|
|
default:
|
|
return nil, errors.New("can't iterate over " + reflect.ValueOf(l1).Type().String())
|
|
}
|
|
}
|
|
|
|
// Uniq takes in a slice or array and returns a slice with subsequent
|
|
// duplicate elements removed.
|
|
func (ns *Namespace) Uniq(seq interface{}) (interface{}, error) {
|
|
if seq == nil {
|
|
return make([]interface{}, 0), nil
|
|
}
|
|
|
|
v := reflect.ValueOf(seq)
|
|
var slice reflect.Value
|
|
|
|
switch v.Kind() {
|
|
case reflect.Slice:
|
|
slice = reflect.MakeSlice(v.Type(), 0, 0)
|
|
case reflect.Array:
|
|
slice = reflect.MakeSlice(reflect.SliceOf(v.Type().Elem()), 0, 0)
|
|
default:
|
|
return nil, errors.Errorf("type %T not supported", seq)
|
|
}
|
|
|
|
seen := make(map[interface{}]bool)
|
|
for i := 0; i < v.Len(); i++ {
|
|
ev, _ := indirectInterface(v.Index(i))
|
|
if !ev.Type().Comparable() {
|
|
return nil, errors.New("elements must be comparable")
|
|
}
|
|
key := normalize(ev)
|
|
if _, found := seen[key]; !found {
|
|
slice = reflect.Append(slice, ev)
|
|
seen[key] = true
|
|
}
|
|
}
|
|
|
|
return slice.Interface(), nil
|
|
|
|
}
|
|
|
|
// KeyVals creates a key and values wrapper.
|
|
func (ns *Namespace) KeyVals(key interface{}, vals ...interface{}) (types.KeyValues, error) {
|
|
return types.KeyValues{Key: key, Values: vals}, nil
|
|
}
|
|
|
|
// NewScratch creates a new Scratch which can be used to store values in a
|
|
// thread safe way.
|
|
func (ns *Namespace) NewScratch() *maps.Scratch {
|
|
return maps.NewScratch()
|
|
}
|