mirror of
https://github.com/gohugoio/hugo.git
synced 2024-11-21 20:46:30 -05:00
281 lines
6.9 KiB
Go
281 lines
6.9 KiB
Go
// Copyright 2017 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 compare provides template functions for comparing values.
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package compare
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import (
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"fmt"
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"reflect"
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"strconv"
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"time"
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"github.com/gohugoio/hugo/compare"
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"github.com/gohugoio/hugo/common/types"
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)
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// New returns a new instance of the compare-namespaced template functions.
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func New(caseInsensitive bool) *Namespace {
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return &Namespace{caseInsensitive: caseInsensitive}
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}
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// Namespace provides template functions for the "compare" namespace.
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type Namespace struct {
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// Enable to do case insensitive string compares.
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caseInsensitive bool
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}
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// Default checks whether a given value is set and returns a default value if it
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// is not. "Set" in this context means non-zero for numeric types and times;
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// non-zero length for strings, arrays, slices, and maps;
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// any boolean or struct value; or non-nil for any other types.
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func (*Namespace) Default(dflt interface{}, given ...interface{}) (interface{}, error) {
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// given is variadic because the following construct will not pass a piped
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// argument when the key is missing: {{ index . "key" | default "foo" }}
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// The Go template will complain that we got 1 argument when we expectd 2.
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if len(given) == 0 {
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return dflt, nil
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}
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if len(given) != 1 {
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return nil, fmt.Errorf("wrong number of args for default: want 2 got %d", len(given)+1)
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}
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g := reflect.ValueOf(given[0])
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if !g.IsValid() {
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return dflt, nil
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}
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set := false
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switch g.Kind() {
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case reflect.Bool:
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set = true
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case reflect.String, reflect.Array, reflect.Slice, reflect.Map:
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set = g.Len() != 0
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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set = g.Int() != 0
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case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
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set = g.Uint() != 0
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case reflect.Float32, reflect.Float64:
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set = g.Float() != 0
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case reflect.Complex64, reflect.Complex128:
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set = g.Complex() != 0
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case reflect.Struct:
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switch actual := given[0].(type) {
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case time.Time:
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set = !actual.IsZero()
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default:
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set = true
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}
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default:
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set = !g.IsNil()
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}
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if set {
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return given[0], nil
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}
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return dflt, nil
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}
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// Eq returns the boolean truth of arg1 == arg2 || arg1 == arg3 || arg1 == arg4.
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func (n *Namespace) Eq(first interface{}, others ...interface{}) bool {
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if n.caseInsensitive {
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panic("caseInsensitive not implemented for Eq")
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}
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if len(others) == 0 {
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panic("missing arguments for comparison")
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}
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normalize := func(v interface{}) interface{} {
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if types.IsNil(v) {
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return nil
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}
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vv := reflect.ValueOf(v)
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switch vv.Kind() {
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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return vv.Int()
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case reflect.Float32, reflect.Float64:
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return vv.Float()
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case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
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return vv.Uint()
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default:
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return v
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}
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}
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normFirst := normalize(first)
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for _, other := range others {
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if e, ok := first.(compare.Eqer); ok {
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return e.Eq(other)
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}
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if e, ok := other.(compare.Eqer); ok {
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return e.Eq(first)
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}
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other = normalize(other)
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if reflect.DeepEqual(normFirst, other) {
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return true
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}
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}
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return false
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}
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// Ne returns the boolean truth of arg1 != arg2.
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func (n *Namespace) Ne(x, y interface{}) bool {
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return !n.Eq(x, y)
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}
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// Ge returns the boolean truth of arg1 >= arg2.
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func (n *Namespace) Ge(a, b interface{}) bool {
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left, right := n.compareGet(a, b)
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return left >= right
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}
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// Gt returns the boolean truth of arg1 > arg2.
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func (n *Namespace) Gt(a, b interface{}) bool {
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left, right := n.compareGet(a, b)
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return left > right
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}
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// Le returns the boolean truth of arg1 <= arg2.
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func (n *Namespace) Le(a, b interface{}) bool {
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left, right := n.compareGet(a, b)
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return left <= right
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}
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// Lt returns the boolean truth of arg1 < arg2.
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func (n *Namespace) Lt(a, b interface{}) bool {
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left, right := n.compareGet(a, b)
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return left < right
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}
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// Conditional can be used as a ternary operator.
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// It returns a if condition, else b.
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func (n *Namespace) Conditional(condition bool, a, b interface{}) interface{} {
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if condition {
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return a
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}
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return b
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}
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func (ns *Namespace) compareGet(a interface{}, b interface{}) (float64, float64) {
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if ac, ok := a.(compare.Comparer); ok {
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c := ac.Compare(b)
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if c < 0 {
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return 1, 0
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} else if c == 0 {
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return 0, 0
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} else {
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return 0, 1
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}
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}
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if bc, ok := b.(compare.Comparer); ok {
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c := bc.Compare(a)
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if c < 0 {
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return 0, 1
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} else if c == 0 {
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return 0, 0
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} else {
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return 1, 0
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}
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}
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var left, right float64
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var leftStr, rightStr *string
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av := reflect.ValueOf(a)
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switch av.Kind() {
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case reflect.Array, reflect.Chan, reflect.Map, reflect.Slice:
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left = float64(av.Len())
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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left = float64(av.Int())
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case reflect.Float32, reflect.Float64:
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left = av.Float()
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case reflect.String:
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var err error
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left, err = strconv.ParseFloat(av.String(), 64)
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if err != nil {
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str := av.String()
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leftStr = &str
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}
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case reflect.Struct:
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switch av.Type() {
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case timeType:
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left = float64(toTimeUnix(av))
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}
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}
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bv := reflect.ValueOf(b)
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switch bv.Kind() {
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case reflect.Array, reflect.Chan, reflect.Map, reflect.Slice:
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right = float64(bv.Len())
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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right = float64(bv.Int())
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case reflect.Float32, reflect.Float64:
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right = bv.Float()
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case reflect.String:
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var err error
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right, err = strconv.ParseFloat(bv.String(), 64)
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if err != nil {
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str := bv.String()
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rightStr = &str
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}
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case reflect.Struct:
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switch bv.Type() {
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case timeType:
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right = float64(toTimeUnix(bv))
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}
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}
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if ns.caseInsensitive && leftStr != nil && rightStr != nil {
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c := compare.Strings(*leftStr, *rightStr)
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if c < 0 {
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return 0, 1
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} else if c > 0 {
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return 1, 0
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} else {
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return 0, 0
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}
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}
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switch {
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case leftStr == nil || rightStr == nil:
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case *leftStr < *rightStr:
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return 0, 1
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case *leftStr > *rightStr:
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return 1, 0
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default:
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return 0, 0
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}
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return left, right
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}
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var timeType = reflect.TypeOf((*time.Time)(nil)).Elem()
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func toTimeUnix(v reflect.Value) int64 {
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if v.Kind() == reflect.Interface {
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return toTimeUnix(v.Elem())
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}
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if v.Type() != timeType {
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panic("coding error: argument must be time.Time type reflect Value")
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}
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return v.MethodByName("Unix").Call([]reflect.Value{})[0].Int()
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}
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