forked from revel/modules
/
init.go
189 lines (165 loc) · 5.18 KB
/
init.go
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package pongo2
import (
"io"
"strings"
p2 "github.com/flosch/pongo2"
"github.com/revel/revel"
"github.com/tylerb/gls"
)
// Adapter for HAML Templates.
type PongoTemplate struct {
template *p2.Template
engine *PongoEngine
*revel.TemplateView
}
type Pongo2BaseTag struct {
field string
}
func (node *Pongo2BaseTag) GetField(ctx *p2.ExecutionContext) (value interface{}, found bool) {
value, found = ctx.Public[node.field]
if !found {
value, found = ctx.Private[node.field]
}
if found {
if wrapped, ok := value.(*p2.Value); ok {
value = wrapped.Interface()
}
}
return
}
type INodeImplied struct {
Exec func(*p2.ExecutionContext, p2.TemplateWriter) *p2.Error
}
func (i *INodeImplied) Execute(ctx *p2.ExecutionContext, w p2.TemplateWriter) *p2.Error {
return i.Exec(ctx, w)
}
func (tmpl PongoTemplate) Name() string {
return tmpl.TemplateName
}
func getContext() map[string]interface{} {
return gls.Get("data").(map[string]interface{})
}
// return a 'revel.Template' from HAML's template.
func (tmpl PongoTemplate) Render(wr io.Writer, arg interface{}) (err error) {
gls.With(gls.Values(map[interface{}]interface{}{"data": arg}), func() {
err = tmpl.template.ExecuteWriter(p2.Context(arg.(map[string]interface{})), wr)
if nil != err {
if e, ok := err.(*p2.Error); ok {
rerr := &revel.Error{
Title: "Template Execution Error",
Path: tmpl.TemplateName,
Description: e.Error(),
Line: e.Line,
}
if revel.DevMode {
rerr.SourceLines = tmpl.Content()
}
err = rerr
}
}
})
return err
}
// There is only a single instance of the PongoEngine initialized.
type PongoEngine struct {
loader *revel.TemplateLoader
templateSetBybasePath map[string]*p2.TemplateSet
templates map[string]*PongoTemplate
CaseInsensitive bool
}
func (engine *PongoEngine) ConvertPath(path string) string {
if engine.CaseInsensitive {
return strings.ToLower(path)
}
return path
}
func (engine *PongoEngine) Handles(templateView *revel.TemplateView) bool {
return revel.EngineHandles(engine, templateView)
}
func (engine *PongoEngine) ParseAndAdd(baseTemplate *revel.TemplateView) error {
templateSet := engine.templateSetBybasePath[baseTemplate.BasePath]
if nil == templateSet {
templateSet = p2.NewSet(baseTemplate.BasePath, p2.MustNewLocalFileSystemLoader(baseTemplate.BasePath))
engine.templateSetBybasePath[baseTemplate.BasePath] = templateSet
}
tpl, err := templateSet.FromBytes(baseTemplate.FileBytes)
if nil != err {
_, line, description := parsePongo2Error(err)
return &revel.Error{
Title: "Template Compilation Error",
Path: baseTemplate.FilePath,
Description: description,
Line: line,
SourceLines: strings.Split(string(baseTemplate.FileBytes), "\n"),
}
}
baseTemplate.TemplateName = engine.ConvertPath(baseTemplate.TemplateName)
engine.templates[baseTemplate.TemplateName] = &PongoTemplate{
template: tpl,
engine: engine,
TemplateView: baseTemplate,
}
return nil
}
func (engine *PongoEngine) Name() string {
return "pongo2"
}
func parsePongo2Error(err error) (templateName string, line int, description string) {
pongoError := err.(*p2.Error)
if nil != pongoError {
return pongoError.Filename, pongoError.Line, pongoError.Error()
}
return "Unknown error", 0, err.Error()
}
func (engine *PongoEngine) Lookup(templateName string) revel.Template {
tpl, found := engine.templates[engine.ConvertPath(templateName)]
if !found {
return nil
}
return tpl
}
func (engine *PongoEngine) Event(action revel.Event, i interface{}) {
if action == revel.TEMPLATE_REFRESH_REQUESTED {
// At this point all the templates have been passed into the
engine.templateSetBybasePath = map[string]*p2.TemplateSet{}
engine.templates = map[string]*PongoTemplate{}
engine.CaseInsensitive = revel.Config.BoolDefault("pongo2.template.caseinsensitive", true)
}
}
func init() {
revel.RegisterTemplateLoader("pongo2", func(loader *revel.TemplateLoader) (revel.TemplateEngine, error) {
return &PongoEngine{
loader: loader,
templateSetBybasePath: map[string]*p2.TemplateSet{},
templates: map[string]*PongoTemplate{},
}, nil
})
/*
// TODO Dynamically call all the built in functions, PR welcome
for key,templateFunction := range revel.TemplateFuncs {
p2.RegisterTag(key, func(doc *p2.Parser, start *p2.Token, arguments *p2.Parser) (p2.INodeTag, *p2.Error) {
evals := []p2.IEvaluator{}
for arguments.Remaining() > 0 {
expr, err := arguments.ParseExpression()
evals = append(evals, expr)
if err != nil {
return nil, err
}
}
return &INodeImplied{Exec: func(ctx *p2.ExecutionContext,w p2.TemplateWriter) *p2.Error {
args := make([]interface{}, len(evals))
for i, ev := range evals {
obj, err := ev.Evaluate(ctx)
if err != nil {
return err
}
args[i] = obj
}
v:= &tagURLForNode{evals}
reflect.MakeFunc ....
return v.Execute(ctx,w)
}}, nil
})
}
*/
}