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// Copyright 2019 The Hugo Authors. All rights reserved.
// Some functions in this file (see comments) is based on the Go source code,
// copyright The Go Authors and governed by a BSD-style license.
//
// 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 hreflect contains reflect helpers.
package hreflect
import (
"reflect"
"github.com/gohugoio/hugo/common/types"
)
// TODO(bep) replace the private versions in /tpl with these.
// IsNumber returns whether the given kind is a number.
func IsNumber(kind reflect.Kind) bool {
return IsInt(kind) || IsUint(kind) || IsFloat(kind)
}
// IsInt returns whether the given kind is an int.
func IsInt(kind reflect.Kind) bool {
switch kind {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return true
default:
return false
}
}
// IsUint returns whether the given kind is an uint.
func IsUint(kind reflect.Kind) bool {
switch kind {
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
return true
default:
return false
}
}
// IsFloat returns whether the given kind is a float.
func IsFloat(kind reflect.Kind) bool {
switch kind {
case reflect.Float32, reflect.Float64:
return true
default:
return false
}
}
// IsTruthful returns whether in represents a truthful value.
// See IsTruthfulValue
func IsTruthful(in interface{}) bool {
switch v := in.(type) {
case reflect.Value:
return IsTruthfulValue(v)
default:
return IsTruthfulValue(reflect.ValueOf(in))
}
}
var zeroType = reflect.TypeOf((*types.Zeroer)(nil)).Elem()
// IsTruthfulValue returns whether the given value has a meaningful truth value.
// This is based on template.IsTrue in Go's stdlib, but also considers
// IsZero and any interface value will be unwrapped before it's considered
// for truthfulness.
//
// Based on:
// https://github.com/golang/go/blob/178a2c42254166cffed1b25fb1d3c7a5727cada6/src/text/template/exec.go#L306
func IsTruthfulValue(val reflect.Value) (truth bool) {
val = indirectInterface(val)
if !val.IsValid() {
// Something like var x interface{}, never set. It's a form of nil.
return
}
if val.Type().Implements(zeroType) {
return !val.Interface().(types.Zeroer).IsZero()
}
switch val.Kind() {
case reflect.Array, reflect.Map, reflect.Slice, reflect.String:
truth = val.Len() > 0
case reflect.Bool:
truth = val.Bool()
case reflect.Complex64, reflect.Complex128:
truth = val.Complex() != 0
case reflect.Chan, reflect.Func, reflect.Ptr, reflect.Interface:
truth = !val.IsNil()
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
truth = val.Int() != 0
case reflect.Float32, reflect.Float64:
truth = val.Float() != 0
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
truth = val.Uint() != 0
case reflect.Struct:
truth = true // Struct values are always true.
default:
return
}
return
}
// Based on: https://github.com/golang/go/blob/178a2c42254166cffed1b25fb1d3c7a5727cada6/src/text/template/exec.go#L931
func indirectInterface(v reflect.Value) reflect.Value {
if v.Kind() != reflect.Interface {
return v
}
if v.IsNil() {
return reflect.Value{}
}
return v.Elem()
}
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