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htmlencoder.go
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htmlencoder.go
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package web
import (
"fmt"
"html"
"io"
"github.com/gregoryv/nexus"
)
// NewSafeHtmlEncoder returns a HtmlEncoder that escapes plain values.
// Values from io.Reader elements or those implementing WriterTo are
// not escaped.
func NewSafeHtmlEncoder(w io.Writer) *HtmlEncoder {
p, err := nexus.NewPrinter(w)
return &HtmlEncoder{
Printer: p,
err: err,
safe: true,
}
}
func NewHtmlEncoder(w io.Writer) *HtmlEncoder {
p, err := nexus.NewPrinter(w)
return &HtmlEncoder{
Printer: p,
err: err,
}
}
type HtmlEncoder struct {
*nexus.Printer
err *error
safe bool
}
func (p *HtmlEncoder) Encode(t interface{}) error {
if t, ok := t.(*Element); ok && t.Name == "html" {
p.Print("<!DOCTYPE html>\n\n")
}
p.writeElement(t)
return *p.err
}
func (p *HtmlEncoder) writeElement(t interface{}) {
switch t := t.(type) {
case *Element:
switch {
case t.Name == "!--":
p.Print("<!--")
case t.Name == "wrapper":
default:
p.open(t)
}
for _, child := range t.Children {
p.writeElement(child)
}
switch {
case t.Name == "!--":
p.Print("-->")
case t.Name == "wrapper":
default:
p.close(t)
}
case io.Reader:
io.Copy(p, t)
case io.WriterTo:
t.WriteTo(p)
case ElementBuilder:
p.writeElement(t.BuildElement())
default:
if p.safe {
p.Print(html.EscapeString(fmt.Sprintf("%v", t)))
} else {
p.Printf("%v", t)
}
}
}
// ElementBuilder are used to dynamically inject elements during
// encoding.
type ElementBuilder interface {
BuildElement() *Element
}
var newLineAfterOpen = map[string]bool{
"html": true,
"body": true,
"head": true,
"table": true,
"article": true,
"section": true,
"ol": true,
"ul": true,
"dl": true,
"fieldset": true,
}
func (p *HtmlEncoder) open(t *Element) {
p.Print("<", t.Name)
for _, attr := range t.Attributes {
if p.safe {
p.Print(" ", attr.SafeString())
} else {
p.Print(" ", attr.String())
}
}
if !t.simple {
p.Print(">")
}
if newLineAfterOpen[t.Name] {
p.Println()
}
}
var newLineAfterClose = map[string]bool{
"html": true,
"body": true,
"head": true,
"title": true,
"table": true,
"tr": true,
"article": true,
"header": true,
"nav": true,
"section": true,
"style": true,
"script": true,
"meta": true,
"link": true,
"p": true,
"h1": true,
"h2": true,
"h3": true,
"h4": true,
"h5": true,
"h6": true,
"li": true,
"ul": true,
"ol": true,
"dt": true,
"dd": true,
"div": true,
"fieldset": true,
}
func (p *HtmlEncoder) close(t *Element) {
if t.simple {
p.Print("/>")
if newLineAfterClose[t.Name] {
p.Println()
}
return
}
p.Print("</", t.Name, ">")
if newLineAfterClose[t.Name] {
p.Println()
}
}