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render_enjin.go
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render_enjin.go
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//go:build !exclude_pages_formats && !exclude_pages_format_njn
// Copyright (c) 2022 The Go-Enjin 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 njn
import (
"bytes"
"encoding/json"
"fmt"
"html/template"
"sync"
"github.com/iancoleman/strcase"
clPath "github.com/go-corelibs/path"
"github.com/go-enjin/be/pkg/context"
"github.com/go-enjin/be/pkg/errors"
"github.com/go-enjin/be/pkg/feature"
"github.com/go-enjin/be/pkg/globals"
"github.com/go-enjin/be/pkg/log"
"github.com/go-enjin/be/pkg/request/argv"
)
var _ feature.EnjinRenderer = (*RenderEnjin)(nil)
type RenderEnjin struct {
Njn feature.EnjinSystem
Theme feature.Theme
Enjin feature.Internals
ctx context.Context
blockCount int
headingLevel int
headingCount int
currentDepth int
withinAside bool
cache map[string]string
data interface{}
footnotes map[int][]map[string]interface{}
sync.RWMutex
}
func renderNjnData(f *CFeature, ctx context.Context, data interface{}) (html template.HTML, redirect string, err error) {
re := new(RenderEnjin)
re.Njn = f
re.Enjin = f.Enjin
re.Theme = f.Enjin.MustGetTheme()
re.ctx = ctx
re.headingLevel = 0
re.cache = make(map[string]string)
re.data = data
re.footnotes = make(map[int][]map[string]interface{}, 0)
re.currentDepth = 0
html, redirect, err = re.Render(data)
return
}
func (re *RenderEnjin) RequestArgv() (reqArgv *argv.Argv) {
var ok bool
if reqArgv, ok = re.ctx.Get(argv.RequestKey.String()).(*argv.Argv); ok {
//reqArgv.Request, _ = re.ctx.Get("R").(*http.Request)
} else {
reqArgv = &argv.Argv{}
}
return
}
func (re *RenderEnjin) RequestContext() (ctx context.Context) {
ctx = re.ctx
return
}
func (re *RenderEnjin) Render(data interface{}) (html template.HTML, redirect string, err error) {
if prepared, redir, e := re.PreparePageData(data); e != nil {
err = e
return
} else if redir != "" {
redirect = redir
return
} else {
if h, ee := re.RenderNjnTemplateList("block-list", prepared); ee != nil {
content, _ := json.MarshalIndent(prepared, "", " ")
err = errors.NewEnjinError(
"error rendering njn template list",
ee.Error(),
string(content),
)
} else {
html = h
}
}
return
}
func (re *RenderEnjin) PreparePageData(data interface{}) (blocks []interface{}, redirect string, err *errors.EnjinError) {
switch typedData := data.(type) {
case []interface{}:
for _, c := range typedData {
if preparedBlocks, redir, e := re.PreparePageData(c); e != nil {
err = e
return
} else if redir != "" {
redirect = redir
return
} else {
blocks = append(blocks, preparedBlocks...)
}
}
case map[string]interface{}:
if prepared, redir, e := re.PrepareBlock(typedData); e != nil {
preparedBlock, _ := re.PrepareErrorBlock(e.Error(), typedData)
blocks = append(blocks, preparedBlock)
} else if redir != "" {
redirect = redir
return
} else {
blocks = append(blocks, prepared)
}
default:
err = errors.NewEnjinError(
"unsupported njn data type",
fmt.Sprintf("unsupported njn data type received: %T", typedData),
fmt.Sprintf("%+v", typedData),
)
}
return
}
func (re *RenderEnjin) GetNjnTemplateContent(name string) (contents string, err error) {
if v, ok := re.cache[name]; ok {
log.TraceF("found cached njn template: %v", name)
contents = v
return
}
path := clPath.JoinWithSlashes("layouts", globals.PartialThemeLayoutName, "njn", name)
log.TraceF("looking for njn template: %v - %v", name, path)
var data []byte
if data, err = re.Theme.ThemeFS().ReadFile(path); err == nil {
contents = string(data)
re.cache[name] = contents
log.TraceF("caching new njn template: %v - %v", name, path)
} else if parent := re.Theme.GetParent(); parent != nil && parent.ThemeFS() != nil {
if data, err = parent.ThemeFS().ReadFile(path); err == nil {
contents = string(data)
re.cache[name] = contents
log.TraceF("caching new parent njn template: %v - %v", name, path)
} else {
err = fmt.Errorf("parent njn template not found: %v, expected path: %v", name, path)
}
} else {
err = fmt.Errorf("njn template not found: %v, expected path: %v", name, path)
}
return
}
func (re *RenderEnjin) RenderNjnTemplateList(tag string, data []interface{}) (html template.HTML, err error) {
var tmplContent string
if tmplContent, err = re.GetNjnTemplateContent(tag + ".tmpl"); err != nil {
return
} else {
var tt *template.Template
if tt, err = re.Theme.NewHtmlTemplate(re.Enjin, "render-enjin--"+tag, re.ctx); err == nil {
if tt, err = tt.Parse(tmplContent); err == nil {
var w bytes.Buffer
if err = tt.Execute(&w, data); err == nil {
html = template.HTML(w.Bytes())
} else {
err = fmt.Errorf("error rendering template: %v", err)
}
}
} else {
err = fmt.Errorf("error parsing template: %v", err)
}
}
return
}
func (re *RenderEnjin) RenderNjnTemplate(tag string, data map[string]interface{}) (html template.HTML, err error) {
var tmplContent string
if tmplContent, err = re.GetNjnTemplateContent(tag + ".tmpl"); err != nil {
return
} else {
var tt *template.Template
if tt, err = re.Theme.NewHtmlTemplate(re.Enjin, "render-enjin--"+tag, re.ctx); err == nil {
if tt, err = tt.Parse(tmplContent); err == nil {
var w bytes.Buffer
if err = tt.Execute(&w, data); err == nil {
html = template.HTML(w.Bytes())
} else {
err = fmt.Errorf("error rendering template: %v", err)
}
}
} else {
err = fmt.Errorf("error parsing template: %v", err)
}
}
return
}
func (re *RenderEnjin) GetData() (data interface{}) {
return re.data
}
func (re *RenderEnjin) GetHeadingLevel() (level int) {
level = re.headingLevel
return
}
func (re *RenderEnjin) IncHeadingLevel() {
re.headingLevel += 1
return
}
func (re *RenderEnjin) DecHeadingLevel() {
re.headingLevel -= 1
return
}
func (re *RenderEnjin) SetHeadingLevel(level int) {
re.headingLevel = level
return
}
func (re *RenderEnjin) GetHeadingCount() (count int) {
count = re.headingCount
return
}
func (re *RenderEnjin) IncHeadingCount() {
re.headingCount += 1
return
}
func (re *RenderEnjin) SetHeadingCount(count int) {
re.headingCount = count
return
}
func (re *RenderEnjin) AddFootnote(blockIndex int, field map[string]interface{}) (index int) {
if _, ok := re.footnotes[blockIndex]; !ok {
re.footnotes[blockIndex] = make([]map[string]interface{}, 0)
}
re.footnotes[blockIndex] = append(re.footnotes[blockIndex], field)
index = len(re.footnotes[blockIndex]) - 1
return
}
func (re *RenderEnjin) PrepareFootnotes(blockIndex int) (footnotes []map[string]interface{}, err error) {
footnotes, _ = re.footnotes[blockIndex]
return
}
func (re *RenderEnjin) GetBlockIndex() (index int) {
index = re.blockCount - 1
return
}
func (re *RenderEnjin) ParseTypeName(data map[string]interface{}) (name string, ok bool) {
if name, ok = data["type"].(string); ok {
name = strcase.ToKebab(name)
} else if name, ok = data["Type"].(string); ok {
name = strcase.ToKebab(name)
}
return
}
func (re *RenderEnjin) ParseFieldAndTypeName(data interface{}) (field map[string]interface{}, name string, ok bool) {
if field, ok = data.(map[string]interface{}); ok {
name, ok = re.ParseTypeName(field)
}
return
}
func (re *RenderEnjin) GetWithinAside() (within bool) {
within = re.withinAside
return
}
func (re *RenderEnjin) SetWithinAside(within bool) {
re.withinAside = within
return
}
func (re *RenderEnjin) GetCurrentDepth() (depth int) {
depth = re.currentDepth
return
}
func (re *RenderEnjin) IncCurrentDepth() (depth int) {
re.currentDepth += 1
return re.currentDepth
}
func (re *RenderEnjin) DecCurrentDepth() (depth int) {
re.currentDepth -= 1
return re.currentDepth
}