mirror of
https://github.com/gohugoio/hugo.git
synced 2024-12-23 15:23:03 +00:00
388 lines
9.8 KiB
Go
388 lines
9.8 KiB
Go
// Copyright 2017 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 compare provides template functions for comparing values.
|
|
package compare
|
|
|
|
import (
|
|
"fmt"
|
|
"math"
|
|
"reflect"
|
|
"strconv"
|
|
"time"
|
|
|
|
"github.com/gohugoio/hugo/compare"
|
|
"github.com/gohugoio/hugo/langs"
|
|
|
|
"github.com/gohugoio/hugo/common/hreflect"
|
|
"github.com/gohugoio/hugo/common/htime"
|
|
"github.com/gohugoio/hugo/common/types"
|
|
)
|
|
|
|
// New returns a new instance of the compare-namespaced template functions.
|
|
func New(loc *time.Location, caseInsensitive bool) *Namespace {
|
|
return &Namespace{loc: loc, caseInsensitive: caseInsensitive}
|
|
}
|
|
|
|
// Namespace provides template functions for the "compare" namespace.
|
|
type Namespace struct {
|
|
loc *time.Location
|
|
// Enable to do case insensitive string compares.
|
|
caseInsensitive bool
|
|
}
|
|
|
|
// Default checks whether a givenv is set and returns the default value defaultv if it
|
|
// is not. "Set" in this context means non-zero for numeric types and times;
|
|
// non-zero length for strings, arrays, slices, and maps;
|
|
// any boolean or struct value; or non-nil for any other types.
|
|
func (*Namespace) Default(defaultv any, givenv ...any) (any, error) {
|
|
// given is variadic because the following construct will not pass a piped
|
|
// argument when the key is missing: {{ index . "key" | default "foo" }}
|
|
// The Go template will complain that we got 1 argument when we expected 2.
|
|
|
|
if len(givenv) == 0 {
|
|
return defaultv, nil
|
|
}
|
|
if len(givenv) != 1 {
|
|
return nil, fmt.Errorf("wrong number of args for default: want 2 got %d", len(givenv)+1)
|
|
}
|
|
|
|
g := reflect.ValueOf(givenv[0])
|
|
if !g.IsValid() {
|
|
return defaultv, nil
|
|
}
|
|
|
|
set := false
|
|
|
|
switch g.Kind() {
|
|
case reflect.Bool:
|
|
set = true
|
|
case reflect.String, reflect.Array, reflect.Slice, reflect.Map:
|
|
set = g.Len() != 0
|
|
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
|
|
set = g.Int() != 0
|
|
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
|
|
set = g.Uint() != 0
|
|
case reflect.Float32, reflect.Float64:
|
|
set = g.Float() != 0
|
|
case reflect.Complex64, reflect.Complex128:
|
|
set = g.Complex() != 0
|
|
case reflect.Struct:
|
|
switch actual := givenv[0].(type) {
|
|
case time.Time:
|
|
set = !actual.IsZero()
|
|
default:
|
|
set = true
|
|
}
|
|
default:
|
|
set = !g.IsNil()
|
|
}
|
|
|
|
if set {
|
|
return givenv[0], nil
|
|
}
|
|
|
|
return defaultv, nil
|
|
}
|
|
|
|
// Eq returns the boolean truth of arg1 == arg2 || arg1 == arg3 || arg1 == arg4.
|
|
func (n *Namespace) Eq(first any, others ...any) bool {
|
|
if n.caseInsensitive {
|
|
panic("caseInsensitive not implemented for Eq")
|
|
}
|
|
n.checkComparisonArgCount(1, others...)
|
|
normalize := func(v any) any {
|
|
if types.IsNil(v) {
|
|
return nil
|
|
}
|
|
|
|
if at, ok := v.(htime.AsTimeProvider); ok {
|
|
return at.AsTime(n.loc)
|
|
}
|
|
|
|
vv := reflect.ValueOf(v)
|
|
switch vv.Kind() {
|
|
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
|
|
return vv.Int()
|
|
case reflect.Float32, reflect.Float64:
|
|
return vv.Float()
|
|
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
|
|
i := vv.Uint()
|
|
// If it can fit in an int, convert it.
|
|
if i <= math.MaxInt64 {
|
|
return int64(i)
|
|
}
|
|
return i
|
|
case reflect.String:
|
|
return vv.String()
|
|
default:
|
|
return v
|
|
}
|
|
}
|
|
|
|
normFirst := normalize(first)
|
|
for _, other := range others {
|
|
if e, ok := first.(compare.Eqer); ok {
|
|
if e.Eq(other) {
|
|
return true
|
|
}
|
|
continue
|
|
}
|
|
|
|
if e, ok := other.(compare.Eqer); ok {
|
|
if e.Eq(first) {
|
|
return true
|
|
}
|
|
continue
|
|
}
|
|
|
|
other = normalize(other)
|
|
if reflect.DeepEqual(normFirst, other) {
|
|
return true
|
|
}
|
|
}
|
|
|
|
return false
|
|
}
|
|
|
|
// Ne returns the boolean truth of arg1 != arg2 && arg1 != arg3 && arg1 != arg4.
|
|
func (n *Namespace) Ne(first any, others ...any) bool {
|
|
n.checkComparisonArgCount(1, others...)
|
|
for _, other := range others {
|
|
if n.Eq(first, other) {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
// Ge returns the boolean truth of arg1 >= arg2 && arg1 >= arg3 && arg1 >= arg4.
|
|
func (n *Namespace) Ge(first any, others ...any) bool {
|
|
n.checkComparisonArgCount(1, others...)
|
|
for _, other := range others {
|
|
left, right := n.compareGet(first, other)
|
|
if !(left >= right) {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
// Gt returns the boolean truth of arg1 > arg2 && arg1 > arg3 && arg1 > arg4.
|
|
func (n *Namespace) Gt(first any, others ...any) bool {
|
|
n.checkComparisonArgCount(1, others...)
|
|
for _, other := range others {
|
|
left, right := n.compareGet(first, other)
|
|
if !(left > right) {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
// Le returns the boolean truth of arg1 <= arg2 && arg1 <= arg3 && arg1 <= arg4.
|
|
func (n *Namespace) Le(first any, others ...any) bool {
|
|
n.checkComparisonArgCount(1, others...)
|
|
for _, other := range others {
|
|
left, right := n.compareGet(first, other)
|
|
if !(left <= right) {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
// LtCollate returns the boolean truth of arg1 < arg2 && arg1 < arg3 && arg1 < arg4.
|
|
// The provided collator will be used for string comparisons.
|
|
// This is for internal use.
|
|
func (n *Namespace) LtCollate(collator *langs.Collator, first any, others ...any) bool {
|
|
n.checkComparisonArgCount(1, others...)
|
|
for _, other := range others {
|
|
left, right := n.compareGetWithCollator(collator, first, other)
|
|
if !(left < right) {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
// Lt returns the boolean truth of arg1 < arg2 && arg1 < arg3 && arg1 < arg4.
|
|
func (n *Namespace) Lt(first any, others ...any) bool {
|
|
return n.LtCollate(nil, first, others...)
|
|
}
|
|
|
|
func (n *Namespace) checkComparisonArgCount(min int, others ...any) bool {
|
|
if len(others) < min {
|
|
panic("missing arguments for comparison")
|
|
}
|
|
return true
|
|
}
|
|
|
|
// Conditional can be used as a ternary operator.
|
|
//
|
|
// It returns v1 if cond is true, else v2.
|
|
func (n *Namespace) Conditional(cond any, v1, v2 any) any {
|
|
if hreflect.IsTruthful(cond) {
|
|
return v1
|
|
}
|
|
return v2
|
|
}
|
|
|
|
func (ns *Namespace) compareGet(a any, b any) (float64, float64) {
|
|
return ns.compareGetWithCollator(nil, a, b)
|
|
}
|
|
|
|
func (ns *Namespace) compareTwoUints(a uint64, b uint64) (float64, float64) {
|
|
if a < b {
|
|
return 1, 0
|
|
} else if a == b {
|
|
return 0, 0
|
|
} else {
|
|
return 0, 1
|
|
}
|
|
}
|
|
|
|
func (ns *Namespace) compareGetWithCollator(collator *langs.Collator, a any, b any) (float64, float64) {
|
|
if ac, ok := a.(compare.Comparer); ok {
|
|
c := ac.Compare(b)
|
|
if c < 0 {
|
|
return 1, 0
|
|
} else if c == 0 {
|
|
return 0, 0
|
|
} else {
|
|
return 0, 1
|
|
}
|
|
}
|
|
|
|
if bc, ok := b.(compare.Comparer); ok {
|
|
c := bc.Compare(a)
|
|
if c < 0 {
|
|
return 0, 1
|
|
} else if c == 0 {
|
|
return 0, 0
|
|
} else {
|
|
return 1, 0
|
|
}
|
|
}
|
|
|
|
var left, right float64
|
|
var leftStr, rightStr *string
|
|
av := reflect.ValueOf(a)
|
|
bv := reflect.ValueOf(b)
|
|
|
|
switch av.Kind() {
|
|
case reflect.Array, reflect.Chan, reflect.Map, reflect.Slice:
|
|
left = float64(av.Len())
|
|
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
|
|
if hreflect.IsUint(bv.Kind()) {
|
|
return ns.compareTwoUints(uint64(av.Int()), bv.Uint())
|
|
}
|
|
left = float64(av.Int())
|
|
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32:
|
|
left = float64(av.Uint())
|
|
case reflect.Uint64:
|
|
if hreflect.IsUint(bv.Kind()) {
|
|
return ns.compareTwoUints(av.Uint(), bv.Uint())
|
|
}
|
|
case reflect.Float32, reflect.Float64:
|
|
left = av.Float()
|
|
case reflect.String:
|
|
var err error
|
|
left, err = strconv.ParseFloat(av.String(), 64)
|
|
// Check if float is a special floating value and cast value as string.
|
|
if math.IsInf(left, 0) || math.IsNaN(left) || err != nil {
|
|
str := av.String()
|
|
leftStr = &str
|
|
}
|
|
case reflect.Struct:
|
|
if hreflect.IsTime(av.Type()) {
|
|
left = float64(ns.toTimeUnix(av))
|
|
}
|
|
case reflect.Bool:
|
|
left = 0
|
|
if av.Bool() {
|
|
left = 1
|
|
}
|
|
}
|
|
|
|
switch bv.Kind() {
|
|
case reflect.Array, reflect.Chan, reflect.Map, reflect.Slice:
|
|
right = float64(bv.Len())
|
|
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
|
|
if hreflect.IsUint(av.Kind()) {
|
|
return ns.compareTwoUints(av.Uint(), uint64(bv.Int()))
|
|
}
|
|
right = float64(bv.Int())
|
|
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32:
|
|
right = float64(bv.Uint())
|
|
case reflect.Uint64:
|
|
if hreflect.IsUint(av.Kind()) {
|
|
return ns.compareTwoUints(av.Uint(), bv.Uint())
|
|
}
|
|
case reflect.Float32, reflect.Float64:
|
|
right = bv.Float()
|
|
case reflect.String:
|
|
var err error
|
|
right, err = strconv.ParseFloat(bv.String(), 64)
|
|
// Check if float is a special floating value and cast value as string.
|
|
if math.IsInf(right, 0) || math.IsNaN(right) || err != nil {
|
|
str := bv.String()
|
|
rightStr = &str
|
|
}
|
|
case reflect.Struct:
|
|
if hreflect.IsTime(bv.Type()) {
|
|
right = float64(ns.toTimeUnix(bv))
|
|
}
|
|
case reflect.Bool:
|
|
right = 0
|
|
if bv.Bool() {
|
|
right = 1
|
|
}
|
|
}
|
|
|
|
if (ns.caseInsensitive || collator != nil) && leftStr != nil && rightStr != nil {
|
|
var c int
|
|
if collator != nil {
|
|
c = collator.CompareStrings(*leftStr, *rightStr)
|
|
} else {
|
|
c = compare.Strings(*leftStr, *rightStr)
|
|
}
|
|
if c < 0 {
|
|
return 0, 1
|
|
} else if c > 0 {
|
|
return 1, 0
|
|
} else {
|
|
return 0, 0
|
|
}
|
|
}
|
|
|
|
switch {
|
|
case leftStr == nil || rightStr == nil:
|
|
case *leftStr < *rightStr:
|
|
return 0, 1
|
|
case *leftStr > *rightStr:
|
|
return 1, 0
|
|
default:
|
|
return 0, 0
|
|
}
|
|
|
|
return left, right
|
|
}
|
|
|
|
func (ns *Namespace) toTimeUnix(v reflect.Value) int64 {
|
|
t, ok := hreflect.AsTime(v, ns.loc)
|
|
if !ok {
|
|
panic("coding error: argument must be time.Time type reflect Value")
|
|
}
|
|
return t.Unix()
|
|
}
|