2017-03-13 22:55:02 +00:00
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// 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 collections
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import (
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"errors"
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"fmt"
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"reflect"
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"strings"
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2017-04-30 19:52:56 +00:00
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2017-06-13 16:42:45 +00:00
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"github.com/gohugoio/hugo/tpl"
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2017-03-13 22:55:02 +00:00
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)
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// Apply takes a map, array, or slice and returns a new slice with the function fname applied over it.
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func (ns *Namespace) Apply(seq interface{}, fname string, args ...interface{}) (interface{}, error) {
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if seq == nil {
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return make([]interface{}, 0), nil
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}
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if fname == "apply" {
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return nil, errors.New("can't apply myself (no turtles allowed)")
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}
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seqv := reflect.ValueOf(seq)
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seqv, isNil := indirect(seqv)
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if isNil {
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return nil, errors.New("can't iterate over a nil value")
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}
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fnv, found := ns.lookupFunc(fname)
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if !found {
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return nil, errors.New("can't find function " + fname)
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}
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// fnv := reflect.ValueOf(fn)
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switch seqv.Kind() {
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case reflect.Array, reflect.Slice:
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r := make([]interface{}, seqv.Len())
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for i := 0; i < seqv.Len(); i++ {
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vv := seqv.Index(i)
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vvv, err := applyFnToThis(fnv, vv, args...)
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if err != nil {
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return nil, err
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}
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r[i] = vvv.Interface()
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}
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return r, nil
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default:
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return nil, fmt.Errorf("can't apply over %v", seq)
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}
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}
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func applyFnToThis(fn, this reflect.Value, args ...interface{}) (reflect.Value, error) {
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n := make([]reflect.Value, len(args))
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for i, arg := range args {
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if arg == "." {
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n[i] = this
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} else {
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n[i] = reflect.ValueOf(arg)
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}
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}
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num := fn.Type().NumIn()
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if fn.Type().IsVariadic() {
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num--
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}
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// TODO(bep) see #1098 - also see template_tests.go
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/*if len(args) < num {
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return reflect.ValueOf(nil), errors.New("Too few arguments")
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} else if len(args) > num {
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return reflect.ValueOf(nil), errors.New("Too many arguments")
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}*/
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for i := 0; i < num; i++ {
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// AssignableTo reports whether xt is assignable to type targ.
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if xt, targ := n[i].Type(), fn.Type().In(i); !xt.AssignableTo(targ) {
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return reflect.ValueOf(nil), errors.New("called apply using " + xt.String() + " as type " + targ.String())
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}
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}
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res := fn.Call(n)
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if len(res) == 1 || res[1].IsNil() {
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return res[0], nil
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}
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return reflect.ValueOf(nil), res[1].Interface().(error)
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}
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func (ns *Namespace) lookupFunc(fname string) (reflect.Value, bool) {
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if !strings.ContainsRune(fname, '.') {
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2017-04-30 19:52:56 +00:00
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templ, ok := ns.deps.Tmpl.(tpl.TemplateFuncsGetter)
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if !ok {
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panic("Needs a tpl.TemplateFuncsGetter")
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}
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fm := templ.GetFuncs()
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fn, found := fm[fname]
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2017-03-13 22:55:02 +00:00
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if !found {
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return reflect.Value{}, false
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}
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return reflect.ValueOf(fn), true
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}
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ss := strings.SplitN(fname, ".", 2)
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// namespace
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nv, found := ns.lookupFunc(ss[0])
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if !found {
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return reflect.Value{}, false
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}
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// method
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m := nv.MethodByName(ss[1])
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// if reflect.DeepEqual(m, reflect.Value{}) {
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if m.Kind() == reflect.Invalid {
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return reflect.Value{}, false
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}
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return m, true
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}
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// indirect is taken from 'text/template/exec.go'
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func indirect(v reflect.Value) (rv reflect.Value, isNil bool) {
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for ; v.Kind() == reflect.Ptr || v.Kind() == reflect.Interface; v = v.Elem() {
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if v.IsNil() {
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return v, true
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}
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if v.Kind() == reflect.Interface && v.NumMethod() > 0 {
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break
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}
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}
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return v, false
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}
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2017-07-03 08:32:10 +00:00
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func indirectInterface(v reflect.Value) (rv reflect.Value, isNil bool) {
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for ; v.Kind() == reflect.Interface; v = v.Elem() {
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if v.IsNil() {
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return v, true
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}
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if v.Kind() == reflect.Interface && v.NumMethod() > 0 {
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break
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}
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}
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return v, false
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}
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