ref: 2c9435dbbc2e084a8b7c62d2c6efb82d1cb0c5c6
dir: /browser/fs/experimental.go/
package fs
import (
"bytes"
"fmt"
"github.com/knusbaum/go9p/fs"
"github.com/knusbaum/go9p/proto"
"github.com/psilva261/opossum/logger"
"github.com/psilva261/opossum/nodes"
"github.com/psilva261/opossum/style"
"golang.org/x/net/html"
)
// Node such that one obtains a file structure like
//
// /0
// /0/attrs
// /0/geom
// /0/html
// /0/style
// /0/tag
// /0/0
// ...
// /0/1
// ...
// ...
//
// (dir structure stolen from domfs)
type Node struct {
name string
nt *nodes.Node
}
func (n Node) Stat() (s proto.Stat) {
s = *oFS.NewStat(n.name, un, gn, 0700)
s.Mode |= proto.DMDIR
// qtype bits should be consistent with Stat mode.
s.Qid.Qtype = uint8(s.Mode >> 24)
return
}
func (n Node) WriteStat(s *proto.Stat) error {
return nil
}
func (n Node) SetParent(p fs.Dir) {
}
func (n Node) Parent() fs.Dir {
return nil
}
func (n Node) Children() (cs map[string]fs.FSNode) {
cs = make(map[string]fs.FSNode)
if n.nt == nil {
return
}
for i, c := range n.nt.Children {
ddn := fmt.Sprintf("%v", i)
cs[ddn] = &Node{
name: ddn,
nt: c,
}
}
if n.nt.Type() == html.ElementNode {
cs["tag"] = n.tag()
cs["attrs"] = Attrs{attrs: &n.nt.DomSubtree.Attr}
cs["geom"] = n.geom()
cs["html"] = n.html()
cs["style"] = Style{cs: &n.nt.Map}
}
return
}
func (n Node) tag() fs.FSNode {
return fs.NewDynamicFile(
oFS.NewStat("tag", un, gn, 0666),
func() []byte {
return []byte(n.nt.Data())
},
)
}
func (n Node) geom() fs.FSNode {
return fs.NewDynamicFile(
oFS.NewStat("geom", un, gn, 0666),
func() (bs []byte) {
var dt style.DomTree
if dt = n.nt.Map.DomTree; dt == nil {
return
}
r := dt.Rect()
return []byte(fmt.Sprintf("%v,%v,%v,%v", r.Min.X, r.Min.Y, r.Max.X, r.Max.Y))
},
)
}
func (n Node) html() fs.FSNode {
return fs.NewDynamicFile(
oFS.NewStat("html", un, gn, 0666),
func() []byte {
buf := bytes.NewBufferString("")
if err := html.Render(buf, n.nt.DomSubtree); err != nil {
log.Errorf("render: %v", err)
return []byte{}
}
return []byte(buf.String())
},
)
}
func (n Node) AddChild(fs.FSNode) error {
return nil
}
func (n Node) DeleteChild(name string) error {
return fmt.Errorf("no removal possible")
}
type Attrs struct {
attrs *[]html.Attribute
}
func (as Attrs) Stat() (s proto.Stat) {
s = *oFS.NewStat("attrs", un, gn, 0500)
s.Mode |= proto.DMDIR
// qtype bits should be consistent with Stat mode.
s.Qid.Qtype = uint8(s.Mode >> 24)
return
}
func (as Attrs) WriteStat(s *proto.Stat) error {
return nil
}
func (as Attrs) SetParent(p fs.Dir) {
}
func (as Attrs) Parent() fs.Dir {
return nil
}
func (as Attrs) Children() (cs map[string]fs.FSNode) {
log.Infof("Attrs#Children()")
cs = make(map[string]fs.FSNode)
ff := func(k string) fs.FSNode {
return fs.NewDynamicFile(
oFS.NewStat(k, un, gn, 0666),
func() []byte {
var v string
for _, a := range *as.attrs {
if a.Key == k {
v = a.Val
}
}
return []byte(v)
},
)
}
for _, attr := range *as.attrs {
cs[attr.Key] = ff(attr.Key)
}
return
}
type Style struct {
cs *style.Map
}
func (st Style) Stat() (s proto.Stat) {
s = *oFS.NewStat("style", un, gn, 0500)
s.Mode |= proto.DMDIR
// qtype bits should be consistent with Stat mode.
s.Qid.Qtype = uint8(s.Mode >> 24)
return
}
func (st Style) WriteStat(s *proto.Stat) error {
return nil
}
func (st Style) SetParent(p fs.Dir) {
}
func (st Style) Parent() fs.Dir {
return nil
}
func (st Style) Children() (cs map[string]fs.FSNode) {
log.Infof("Style#Children()")
cs = make(map[string]fs.FSNode)
ff := func(k string) fs.FSNode {
return fs.NewDynamicFile(
oFS.NewStat(k, un, gn, 0666),
func() []byte {
var v string
for p, d := range st.cs.Declarations {
if p == k {
v = d.Val
}
}
return []byte(v)
},
)
}
for p := range st.cs.Declarations {
cs[p] = ff(p)
}
return
}