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// Copyright 2024 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 provides ways to identify values in Hugo. Used for dependency tracking etc.
package identity
import (
"fmt"
"sync/atomic"
hglob "github.com/gohugoio/hugo/hugofs/glob"
)
// NewGlobIdentity creates a new Identity that
// is probably dependent on any other Identity
// that matches the given pattern.
func NewGlobIdentity(pattern string) Identity {
glob, err := hglob.GetGlob(pattern)
if err != nil {
panic(err)
}
predicate := func(other Identity) bool {
return glob.Match(other.IdentifierBase())
}
return NewPredicateIdentity(predicate, nil)
}
var predicateIdentityCounter = &atomic.Uint32{}
type predicateIdentity struct {
id string
probablyDependent func(Identity) bool
probablyDependency func(Identity) bool
}
var (
_ IsProbablyDependencyProvider = &predicateIdentity{}
_ IsProbablyDependentProvider = &predicateIdentity{}
)
// NewPredicateIdentity creates a new Identity that implements both IsProbablyDependencyProvider and IsProbablyDependentProvider
// using the provided functions, both of which are optional.
func NewPredicateIdentity(
probablyDependent func(Identity) bool,
probablyDependency func(Identity) bool,
) *predicateIdentity {
if probablyDependent == nil {
probablyDependent = func(Identity) bool { return false }
}
if probablyDependency == nil {
probablyDependency = func(Identity) bool { return false }
}
return &predicateIdentity{probablyDependent: probablyDependent, probablyDependency: probablyDependency, id: fmt.Sprintf("predicate%d", predicateIdentityCounter.Add(1))}
}
func (id *predicateIdentity) IdentifierBase() string {
return id.id
}
func (id *predicateIdentity) IsProbablyDependent(other Identity) bool {
return id.probablyDependent(other)
}
func (id *predicateIdentity) IsProbablyDependency(other Identity) bool {
return id.probablyDependency(other)
}
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