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html.go
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html.go
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package mobiledoc
import (
"bufio"
"fmt"
"html"
"io"
"net/url"
)
// HTMLRenderer implements a basic HTML renderer.
type HTMLRenderer struct {
Atoms map[string]func(*bufio.Writer, string, Map) error
Cards map[string]func(*bufio.Writer, Map) error
}
// NewHTMLRenderer creates a new HTMLRenderer.
func NewHTMLRenderer() *HTMLRenderer {
return &HTMLRenderer{
Atoms: make(map[string]func(*bufio.Writer, string, Map) error),
Cards: make(map[string]func(*bufio.Writer, Map) error),
}
}
// Render will render the document to the provided writer.
func (r *HTMLRenderer) Render(w io.Writer, doc Document) error {
// wrap writer
bw := bufio.NewWriter(w)
// render sections
for _, section := range doc.Sections {
err := r.renderSection(bw, section)
if err != nil {
return err
}
}
// flush buffer
err := bw.Flush()
if err != nil {
return err
}
return nil
}
func (r *HTMLRenderer) renderSection(w *bufio.Writer, section Section) error {
// select sub renderer based on type
switch section.Type {
case MarkupSection:
return r.renderMarkupSection(w, section)
case ImageSection:
return r.renderImageSection(w, section)
case ListSection:
return r.renderListSection(w, section)
case CardSection:
return r.renderCardSection(w, section)
}
return nil
}
func (r *HTMLRenderer) renderMarkupSection(w *bufio.Writer, section Section) error {
// write open tag
_, err := w.WriteString(fmt.Sprintf("<%s>", section.Tag))
if err != nil {
return err
}
// render markers
err = r.renderMarkers(w, section.Markers)
if err != nil {
return err
}
// write close tag
_, err = w.WriteString(fmt.Sprintf("</%s>", section.Tag))
if err != nil {
return err
}
return nil
}
func (r *HTMLRenderer) renderImageSection(w *bufio.Writer, section Section) error {
// parse url
src, err := url.Parse(section.Source)
if err != nil {
return err
}
// write tag
_, err = w.WriteString(fmt.Sprintf("<img src=\"%s\">", src.String()))
if err != nil {
return err
}
return nil
}
func (r *HTMLRenderer) renderListSection(w *bufio.Writer, section Section) error {
// write open tag
_, err := w.WriteString(fmt.Sprintf("<%s>", section.Tag))
if err != nil {
return err
}
// write all items
for _, item := range section.Items {
// write open tag
_, err := w.WriteString("<li>")
if err != nil {
return err
}
// render markers
err = r.renderMarkers(w, item)
if err != nil {
return err
}
// write close tag
_, err = w.WriteString("</li>")
if err != nil {
return err
}
}
// write close tag
_, err = w.WriteString(fmt.Sprintf("</%s>", section.Tag))
if err != nil {
return err
}
return nil
}
func (r *HTMLRenderer) renderCardSection(w *bufio.Writer, section Section) error {
// get card renderer
renderer, ok := r.Cards[section.Card.Name]
if !ok {
return fmt.Errorf("missing card renderer")
}
// call renderer
err := renderer(w, section.Card.Payload)
if err != nil {
return err
}
return nil
}
func (r *HTMLRenderer) renderMarkers(w *bufio.Writer, markers []Marker) error {
// prepare stack
stack := markupStack{}
// write all markers
for _, marker := range markers {
// write opening markups
for _, markup := range marker.OpenMarkups {
// begin tag
_, err := w.WriteString(fmt.Sprintf("<%s", markup.Tag))
if err != nil {
return err
}
// write attributes
for key, value := range markup.Attributes {
_, err = w.WriteString(fmt.Sprintf(" %s=\"%s\"", key, value))
if err != nil {
return err
}
}
// close tag
_, err = w.WriteString(">")
if err != nil {
return err
}
// push markup
stack.push(markup)
}
// write marker
switch marker.Type {
case TextMarker:
// write text
_, err := w.WriteString(html.EscapeString(marker.Text))
if err != nil {
return err
}
case AtomMarker:
// get renderer
renderer, ok := r.Atoms[marker.Atom.Name]
if !ok {
return fmt.Errorf("missing atom renderer")
}
// call renderer
err := renderer(w, marker.Atom.Text, marker.Atom.Payload)
if err != nil {
return err
}
}
// close markups
for i := 0; i < marker.ClosedMarkups; i++ {
// get markup
markup := stack.pop()
// write closing tag
_, err := w.WriteString(fmt.Sprintf("</%s>", markup.Tag))
if err != nil {
return err
}
}
}
return nil
}
type markupStack struct {
list []*Markup
}
func (s *markupStack) push(m *Markup) {
s.list = append(s.list, m)
}
func (s *markupStack) pop() *Markup {
item := s.list[len(s.list)-1]
s.list = s.list[0 : len(s.list)-1]
return item
}