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// Copyright 2019 The Hugo Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package types contains types shared between packages in Hugo.
package types
import (
"fmt"
"reflect"
"sync/atomic"
"github.com/spf13/cast"
)
// RLocker represents the read locks in sync.RWMutex.
type RLocker interface {
RLock()
RUnlock()
}
type Locker interface {
Lock()
Unlock()
}
type RWLocker interface {
RLocker
Locker
}
// KeyValue is a interface{} tuple.
type KeyValue struct {
Key any
Value any
}
// KeyValueStr is a string tuple.
type KeyValueStr struct {
Key string
Value string
}
// KeyValues holds an key and a slice of values.
type KeyValues struct {
Key any
Values []any
}
// KeyString returns the key as a string, an empty string if conversion fails.
func (k KeyValues) KeyString() string {
return cast.ToString(k.Key)
}
func (k KeyValues) String() string {
return fmt.Sprintf("%v: %v", k.Key, k.Values)
}
// NewKeyValuesStrings takes a given key and slice of values and returns a new
// KeyValues struct.
func NewKeyValuesStrings(key string, values ...string) KeyValues {
iv := make([]any, len(values))
for i := range values {
iv[i] = values[i]
}
return KeyValues{Key: key, Values: iv}
}
// Zeroer, as implemented by time.Time, will be used by the truth template
// funcs in Hugo (if, with, not, and, or).
type Zeroer interface {
IsZero() bool
}
// IsNil reports whether v is nil.
func IsNil(v any) bool {
if v == nil {
return true
}
value := reflect.ValueOf(v)
switch value.Kind() {
case reflect.Chan, reflect.Func, reflect.Interface, reflect.Map, reflect.Ptr, reflect.Slice:
return value.IsNil()
}
return false
}
// DevMarker is a marker interface for types that should only be used during
// development.
type DevMarker interface {
DevOnly()
}
// Unwrapper is implemented by types that can unwrap themselves.
type Unwrapper interface {
// Unwrapv is for internal use only.
// It got its slightly odd name to prevent collisions with user types.
Unwrapv() any
}
// Unwrap returns the underlying value of v if it implements Unwrapper, otherwise v is returned.
func Unwrapv(v any) any {
if u, ok := v.(Unwrapper); ok {
return u.Unwrapv()
}
return v
}
// LowHigh represents a byte or slice boundary.
type LowHigh[S ~[]byte | string] struct {
Low int
High int
}
func (l LowHigh[S]) IsZero() bool {
return l.Low < 0 || (l.Low == 0 && l.High == 0)
}
func (l LowHigh[S]) Value(source S) S {
return source[l.Low:l.High]
}
// This is only used for debugging purposes.
var InvocationCounter atomic.Int64
// NewTrue returns a pointer to b.
func NewBool(b bool) *bool {
return &b
}
// WeightProvider provides a weight.
type WeightProvider interface {
Weight() int
}
// Weight0Provider provides a weight that's considered before the WeightProvider in sorting.
// This allows the weight set on a given term to win.
type Weight0Provider interface {
Weight0() int
}
// PrintableValueProvider is implemented by types that can provide a printable value.
type PrintableValueProvider interface {
PrintableValue() any
}
type (
Strings2 [2]string
Strings3 [3]string
Ints2 [2]int
Ints3 [3]int
)
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