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// Copyright 2017-present The Hugo Authors. All rights reserved.
//
// Portions Copyright The Go Authors.
// 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 tplimpl
import (
"reflect"
"strings"
"github.com/gohugoio/hugo/tpl"
"github.com/gohugoio/hugo/common/maps"
template "github.com/gohugoio/hugo/tpl/internal/go_templates/htmltemplate"
texttemplate "github.com/gohugoio/hugo/tpl/internal/go_templates/texttemplate"
"github.com/gohugoio/hugo/deps"
"github.com/gohugoio/hugo/tpl/internal"
// Init the namespaces
_ "github.com/gohugoio/hugo/tpl/cast"
_ "github.com/gohugoio/hugo/tpl/collections"
_ "github.com/gohugoio/hugo/tpl/compare"
_ "github.com/gohugoio/hugo/tpl/crypto"
_ "github.com/gohugoio/hugo/tpl/data"
_ "github.com/gohugoio/hugo/tpl/debug"
_ "github.com/gohugoio/hugo/tpl/encoding"
_ "github.com/gohugoio/hugo/tpl/fmt"
_ "github.com/gohugoio/hugo/tpl/hugo"
_ "github.com/gohugoio/hugo/tpl/images"
_ "github.com/gohugoio/hugo/tpl/inflect"
_ "github.com/gohugoio/hugo/tpl/lang"
_ "github.com/gohugoio/hugo/tpl/math"
_ "github.com/gohugoio/hugo/tpl/os"
_ "github.com/gohugoio/hugo/tpl/partials"
_ "github.com/gohugoio/hugo/tpl/path"
_ "github.com/gohugoio/hugo/tpl/reflect"
_ "github.com/gohugoio/hugo/tpl/resources"
_ "github.com/gohugoio/hugo/tpl/safe"
_ "github.com/gohugoio/hugo/tpl/site"
_ "github.com/gohugoio/hugo/tpl/strings"
_ "github.com/gohugoio/hugo/tpl/templates"
_ "github.com/gohugoio/hugo/tpl/time"
_ "github.com/gohugoio/hugo/tpl/transform"
_ "github.com/gohugoio/hugo/tpl/urls"
)
var _ texttemplate.ExecHelper = (*templateExecHelper)(nil)
var zero reflect.Value
type templateExecHelper struct {
funcs map[string]reflect.Value
}
func (t *templateExecHelper) GetFunc(tmpl texttemplate.Preparer, name string) (reflect.Value, bool) {
if fn, found := t.funcs[name]; found {
return fn, true
}
return zero, false
}
func (t *templateExecHelper) GetMapValue(tmpl texttemplate.Preparer, receiver, key reflect.Value) (reflect.Value, bool) {
if params, ok := receiver.Interface().(maps.Params); ok {
// Case insensitive.
keystr := strings.ToLower(key.String())
v, found := params[keystr]
if !found {
return zero, false
}
return reflect.ValueOf(v), true
}
v := receiver.MapIndex(key)
return v, v.IsValid()
}
func (t *templateExecHelper) GetMethod(tmpl texttemplate.Preparer, receiver reflect.Value, name string) (method reflect.Value, firstArg reflect.Value) {
// This is a hot path and receiver.MethodByName really shows up in the benchmarks.
// Page.Render is the only method with a WithTemplateInfo as of now, so let's just
// check that for now.
// TODO(bep) find a more flexible, but still fast, way.
if name == "Render" {
if info, ok := tmpl.(tpl.Info); ok {
if m := receiver.MethodByName(name + "WithTemplateInfo"); m.IsValid() {
return m, reflect.ValueOf(info)
}
}
}
return receiver.MethodByName(name), zero
}
func newTemplateExecuter(d *deps.Deps) (texttemplate.Executer, map[string]reflect.Value) {
funcs := createFuncMap(d)
funcsv := make(map[string]reflect.Value)
for k, v := range funcs {
vv := reflect.ValueOf(v)
funcsv[k] = vv
}
// Duplicate Go's internal funcs here for faster lookups.
for k, v := range template.GoFuncs {
if _, exists := funcsv[k]; !exists {
vv, ok := v.(reflect.Value)
if !ok {
vv = reflect.ValueOf(v)
}
funcsv[k] = vv
}
}
for k, v := range texttemplate.GoFuncs {
if _, exists := funcsv[k]; !exists {
funcsv[k] = v
}
}
exeHelper := &templateExecHelper{
funcs: funcsv,
}
return texttemplate.NewExecuter(
exeHelper,
), funcsv
}
func createFuncMap(d *deps.Deps) map[string]interface{} {
funcMap := template.FuncMap{}
// Merge the namespace funcs
for _, nsf := range internal.TemplateFuncsNamespaceRegistry {
ns := nsf(d)
if _, exists := funcMap[ns.Name]; exists {
panic(ns.Name + " is a duplicate template func")
}
funcMap[ns.Name] = ns.Context
for _, mm := range ns.MethodMappings {
for _, alias := range mm.Aliases {
if _, exists := funcMap[alias]; exists {
panic(alias + " is a duplicate template func")
}
funcMap[alias] = mm.Method
}
}
}
if d.OverloadedTemplateFuncs != nil {
for k, v := range d.OverloadedTemplateFuncs {
funcMap[k] = v
}
}
return funcMap
}
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