54 lines
1.2 KiB
JavaScript
54 lines
1.2 KiB
JavaScript
import ID from './ID.js'
|
|
import RootID from './RootID.js'
|
|
|
|
export function getRelativePosition (type, offset) {
|
|
let t = type._start
|
|
while (t !== null) {
|
|
if (t._deleted === false) {
|
|
if (t._length > offset) {
|
|
return [t._id.user, t._id.clock + offset]
|
|
}
|
|
offset -= t._length
|
|
}
|
|
t = t._right
|
|
}
|
|
return ['endof', type._id.user, type._id.clock || null, type._id.name || null, type._id.type || null]
|
|
}
|
|
|
|
export function fromRelativePosition (y, rpos) {
|
|
if (rpos[0] === 'endof') {
|
|
let id
|
|
if (rpos[3] === null) {
|
|
id = new ID(rpos[1], rpos[2])
|
|
} else {
|
|
id = new RootID(rpos[3], rpos[4])
|
|
}
|
|
const type = y.os.get(id)
|
|
return {
|
|
type,
|
|
offset: type.length
|
|
}
|
|
} else {
|
|
let offset = 0
|
|
let struct = y.os.findNodeWithUpperBound(new ID(rpos[0], rpos[1])).val
|
|
const parent = struct._parent
|
|
if (parent._deleted) {
|
|
return null
|
|
}
|
|
if (!struct._deleted) {
|
|
offset = rpos[1] - struct._id.clock
|
|
}
|
|
struct = struct._left
|
|
while (struct !== null) {
|
|
if (!struct._deleted) {
|
|
offset += struct._length
|
|
}
|
|
struct = struct._left
|
|
}
|
|
return {
|
|
type: parent,
|
|
offset: offset
|
|
}
|
|
}
|
|
}
|