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actions.go
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actions.go
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package reader
import (
"log"
"github.com/benoitkugler/pdf/model"
"github.com/benoitkugler/pdf/reader/file"
)
// may return nil if `ac` is nil or invalid
// TODO: more actions
func (r resolver) processAction(ac model.Object) (out model.Action, err error) {
action, _ := r.resolve(ac).(model.ObjDict)
if action["S"] == nil {
return
}
name, _ := r.resolveName(action["S"])
switch name {
case "URI":
var subac model.ActionURI
subac.URI, _ = file.IsString(r.resolve(action["URI"]))
subac.IsMap, _ = r.resolveBool(action["IsMap"])
out.ActionType = subac
case "GoTo":
dest, err := r.processDestination(action["D"])
if err != nil {
return out, err
}
out.ActionType = model.ActionGoTo{D: dest}
case "GoToR":
dest, err := r.processDestination(action["D"])
if err != nil {
return out, err
}
subac := model.ActionRemoteGoTo{D: dest}
subac.NewWindow, _ = r.resolveBool(action["NewWindow"])
subac.F, err = r.resolveFileSpec(action["F"])
if err != nil {
return out, err
}
out.ActionType = subac
case "Launch":
subac := model.ActionRemoteGoTo{}
subac.NewWindow, _ = r.resolveBool(action["NewWindow"])
subac.F, err = r.resolveFileSpec(action["F"])
if err != nil {
return out, err
}
out.ActionType = subac
case "GoToE":
dest, err := r.processDestination(action["D"])
if err != nil {
return out, err
}
subac := model.ActionEmbeddedGoTo{D: dest}
subac.NewWindow, _ = r.resolveBool(action["NewWindow"])
if action["F"] != nil {
subac.F, err = r.resolveFileSpec(action["F"])
if err != nil {
return out, err
}
}
subac.T, err = r.resolveEmbeddedTarget(action["T"])
if err != nil {
return out, err
}
out.ActionType = subac
case "Hide":
var subac model.ActionHide
if hide, ok := r.resolveBool(action["H"]); ok { // false is not the default value
subac.Show = !hide
}
if array, isArray := r.resolveArray(action["T"]); isArray { // many targets
subac.T = make([]model.ActionHideTarget, len(array))
for i, t := range array {
subac.T[i], err = r.resolveOneHideTarget(t)
if err != nil {
return out, err
}
}
} else { // one target
t, err := r.resolveOneHideTarget(action["T"])
if err != nil {
return out, err
}
subac.T = []model.ActionHideTarget{t}
}
out.ActionType = subac
case "Named":
n, _ := r.resolveName(action["N"])
out.ActionType = model.ActionNamed(n)
case "JavaScript":
var js string
if K, ok := r.resolve(action).(model.ObjDict); ok {
js = r.textOrStream(K["JS"])
}
out.ActionType = model.ActionJavaScript{JS: js}
case "Rendition":
var ac model.ActionRendition
ac.R, err = r.resolveRendition(action["R"])
if err != nil {
return out, err
}
if r.resolve(action["AN"]) != nil {
ac.AN, err = r.resolveAnnotation(action["AN"])
if err != nil {
return out, err
}
}
if op, ok := r.resolveInt(action["OP"]); ok {
ac.OP = model.ObjInt(op)
}
ac.JS = r.textOrStream(action["JS"])
out.ActionType = ac
default:
log.Println("unsupported action:", name)
return out, nil
}
if arr, isArray := r.resolveArray(action["Next"]); isArray { // many next actions
out.Next = make([]model.Action, len(arr))
for i, n := range arr {
out.Next[i], err = r.processAction(n)
if err != nil {
return out, err
}
}
} else { // maybe one next, try it
next, err := r.processAction(action["Next"])
if err != nil {
return out, err
}
if next.ActionType != nil {
out.Next = []model.Action{next}
}
}
return out, nil
}
func (r resolver) resolveOneHideTarget(o model.Object) (model.ActionHideTarget, error) {
if st, is := file.IsString(r.resolve(o)); is { // text string
return model.HideTargetFormName(DecodeTextString(st)), nil
}
return r.resolveAnnotation(o)
}
func (r resolver) resolveEmbeddedTarget(o model.Object) (out *model.EmbeddedTarget, err error) {
o = r.resolve(o)
if o == nil {
return nil, nil
}
dict, ok := o.(model.ObjDict)
if !ok {
return nil, errType("Target dictionary", o)
}
out = new(model.EmbeddedTarget)
out.R, _ = r.resolveName(dict["R"])
out.N, _ = file.IsString(r.resolve(dict["N"]))
P := r.resolve(dict["P"])
if p, ok := file.IsString(P); ok {
out.P = model.EmbeddedTargetDestNamed(p)
} else if p, ok := r.resolveInt(P); ok {
out.P = model.EmbeddedTargetDestPage(p)
}
A := r.resolve(dict["A"])
if a, ok := file.IsString(A); ok {
out.A = model.EmbeddedTargetAnnotNamed(a)
} else if a, ok := r.resolveInt(P); ok {
out.A = model.EmbeddedTargetAnnotIndex(a)
}
out.T, err = r.resolveEmbeddedTarget(o)
return out, err
}